CN101256341B - Projection type display device - Google Patents
Projection type display device Download PDFInfo
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- CN101256341B CN101256341B CN2008100865932A CN200810086593A CN101256341B CN 101256341 B CN101256341 B CN 101256341B CN 2008100865932 A CN2008100865932 A CN 2008100865932A CN 200810086593 A CN200810086593 A CN 200810086593A CN 101256341 B CN101256341 B CN 101256341B
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Abstract
In a projector display apparatus wherein the margin to be formed around the image forming range of the light valves can be reduced, and a bright projected image can be formed. An integrator optical system includes first and second lens plates whose positions are capable of fine adjustment. By performing such fine adjustment, the forming position of the illumination range can be adjusted to be positioned so as to include the image forming range. Accordingly, there is no need to provide a wide margin around the image forming range. Thus, usage effectiveness of the illumination light can be increased, thereby improving the brightness of the projected image.
Description
The application is dividing an application of following application:
Application number: 97116055.4
The applying date: on August 18th, 1997
Denomination of invention: projecting display
Technical field
The present invention relates to utilize modulating device such as liquid crystal light valve to implementing modulation from the ejaculation light of light source, making the projecting display of light beam through projecting lens enlarging projection on screen after the modulation corresponding to picture signal.In more detail, the present invention relates in the projecting display of this form, can under appropriate state, the to throw light on image of modulating devices such as liquid crystal light valve forms the structure in district.
Background technology
For example, open to disclose in the flat 3-111806 communique the spy and utilize liquid crystal light valve to form modulated beam of light, make this modulated beam of light enlarging projection and projecting display of constituting on screen corresponding to picture signal.Shown in figure 14.For the modulating device that throws light on equably with the light from light source is the image formation district of liquid crystal light valve 925, disclosed projecting display comprises the integrated optics system 923 with two lens boards 921 and 922 in this communique.
Among Figure 14, become many intermediate beam to the single beam separation that penetrates from light source lamp unit 8, on liquid crystal light valve 925, stack up through the lens 922a that constitutes the 2nd lens board 922 by means of the lens 921a that constitutes the 1st lens board 921.
In projecting display shown in Figure 14, if the image of the liquid crystal light valve 925 that can not correctly throw light on forms the district, the brightness of image that will be created in projection on the projecting plane reduces, perhaps on the edge of projected image, occurs disadvantages such as shadow.Shown in figure 15; The bearing accuracies of other optics of considering the focal length equal error of the lens board 921 that constitutes liquid crystal light valve 925 and integrated optics system 923 and 922 bearing accuracy, the lens 921a that constitutes each lens board and 922a and on light path, disposing etc. are guaranteed certain allowance M around the image of liquid crystal light valve 925 forms district A.Promptly; The size that forms district A to the image of liquid crystal light valve 925 is set recently from the little circle of surround B of the ejaculation light of light source; Even because above-named each structural detail bearing accuracy etc. causes surround B up and down or squinted on the left and right directions, image forms the scope that district A can not exceed surround B yet.And, by means of such structure, avoided the disadvantages such as brightness reduction that shadow or projected image on the projected image edge, occur.For can be corresponding with the location equal error of above-named each structural detail, also can obtain allowance M bigger on a large scale.
On the other hand, in order to improve the brightness of projected image, must improve the utilization ratio of the light of illumination liquid crystal light valve 925.But as stated, if set allowance M greatly so that can be on a large scale and the corresponding words of error of structural detail location etc., then the utilization ratio of light have reduced, also deepening of projected image.Thereby, according to this point, hope that in the liquid crystal light valve viewing area width of the allowance of formation is narrow as far as possible on every side.But if make allowance narrow, as stated, then the surround has broken away from the image formation district of liquid crystal light valve, and the possibility that shadow on the edge of projected image, occurs becomes big.
Summary of the invention
Problem of the present invention is to propose can reduce on allowance that forms around the liquid crystal light valve image generation district and the edge at projected image, can not form shadow, can improve the projecting display of projected image brightness.
In order to solve above-mentioned problem, first projecting display of the present invention is the projecting display that has like lower device: light source; Modulating device is used for the outgoing beam from this light source is implemented the modulation corresponding to picture signal; And projection arrangement, be used to make light beam enlarging projection on the projecting plane of having implemented modulation by means of this modulating device; On the light path between above-mentioned light source and the above-mentioned modulating device; Configuration has and is the rectangular integrated optics system that is disposing first lens board and second lens board of a plurality of lens, can with the direction of optical axis intersection on the installation site of at least one lens board in first and second lens board of adjustment.
By means of said structure, the present invention can improve the utilization ratio of the illumination light of irradiation modulating device, the brightness that can improve projected image.Also have; Form the allowance that forms around the district even reduce at the image of modulating device; Because the position that can finely tune the surround of modulating device is positioned in the surround so that form the district to this image; So, can not produce the disadvantages such as appearance that on the edge of projected image, cause shadow owing to the skew in these two districts yet.
Promptly; After being provided with each structure member of optical system; Image through integrated optics system illumination modulating device forms the district; When the image of surround disengaging modulating device formed the district, fine setting constituted first lens board of integrated optics system or the installation site of second lens board, just can make the image formation district of modulating device be the state that is completely contained in the surround.Thereby surround that consider because optics positioning error etc. causes and image form the skew in district, just can reduce to form the allowance that forms around the district at this image of modulating device.
In the optical system of projecting display, sometimes, on light path, disposed the reflection unit that is used to make the light path bending from above-mentioned light source to above-mentioned modulating device.At this moment, if the setting angle of this reflection unit has error, because this point just might cause that the surround forms district's generation skew to the image of modulating device.Thereby, hope also can be adjusted at the reflection unit that disposes on such position setting angle to incident light axis.
The said structure of first projecting display can be applied to too can projection of color images projecting display.That is, the present invention can be applied to such projecting display too, it so that have: color separation optical system is used for being each column of colour from the ejaculation photolysis of light source; A plurality of above-mentioned modulating devices are used for the above-mentioned column of colour that has separated by means of above-mentioned color separation optical system is modulated; And the look combining optical, be used for synthesizing the light beam of the above-mentioned various looks of having modulated respectively by means of above-mentioned a plurality of modulating devices; The modulated beam of light that has synthesized by means of above-mentioned look combining optical through above-mentioned projection arrangement enlarging projection to the projecting plane.
In the projecting display of can projection such coloured image, sometimes, also dispose reflection unit in the light path between at least one modulating device in above-mentioned color separation optical system and above-mentioned a plurality of modulating device.At this moment, because might be squinted in the surround, so, hope also can adjust the setting angle of this reflection unit in advance to incident light axis.
If can adjust the setting angle that is configured in the reflection unit on the modulating device proximal most position in advance, then to the structure of device or the most favourable to the precision aspect of position, modulating device surround adjustment.
If adopt reflective modulating device to constitute color separation optical system and look combining optical as modulating device and with same optical system, just can shorten optical path length, can make the projecting display miniaturization.
Secondly, relevant second projecting display of the present invention is described.Second projecting display of the present invention is the projecting display with following array apparatus: light source; First optics is used for being divided into many intermediate beam to the light beam from above-mentioned light source; Be configured near second optics of above-mentioned intermediate beam focal position; Modulating device is used for the light that penetrates from above-mentioned second optics is modulated; And projection arrangement, be used for the light beam enlarging projection on the projecting plane that has carried out modulation by means of above-mentioned modulating device; Above-mentioned second optics has: the convergent lens array is used for focusing on many intermediate beam that are divided into by means of above-mentioned first optics respectively; Polarization conversion device; Be used for respectively spatially separating into P light beam and S light beam to the above-mentioned intermediate beam that has focused on through above-mentioned focusing lens array, the polarization direction that makes a certain light beam in above-mentioned P light beam and the S light beam with penetrate after the polarization direction of another light beam is consistent; And coupled lens, be used for being coupled together the light beam stack of penetrating from above-mentioned polarization conversion device; Can with the direction of optical axis intersection on the installation site of at least one optics in above-mentioned first optics of adjustment and above-mentioned second optics.
First optics is equivalent to above-mentioned first lens board, and the coupled lens of second optics is equivalent to above-mentioned second lens board.
Second projecting display of the present invention also is provided with condenser lens battle array and polarization conversion device except the structure of first projecting display.Follow this, have certainly and the same effect of above-mentioned first projecting display.Because by means of adopting polarization conversion device can utilize any light beam and do not waste, so, the projected image of the brightness that can be improved.Also have, because can guide intermediate beam into polarization conversion device with good efficiency through the convergent lens array, so, just can obtain the higher projected image of brightness according to this point.
If integrated, just can reduce the optical loss between these opticses, thereby can further improve the utilization ratio of light above-mentioned focusing lens array, above-mentioned polarization conversion device and above-mentioned coupled lens.
In second projecting display of the present invention, also identical with above-mentioned first projecting display, configuration is used to make the reflection unit of light path bending on the light path from the light source to the modulating device, can adjust its angle or projection of color images; In can the projecting display of projection of color images; On the light path between color separation optical system and the modulating device, dispose reflection unit, can adjust its angle or can adjust the setting angle that is configured in apart from the nearest locational reflection unit of modulating device; Can adopt reflective and so on modulating device as modulating device.These structures can access effect identical with as the such structure in first projecting display time.
The present invention also can be applied to not comprise the projecting display of integrated optics system.At this moment, can adjust the setting angle that is configured in the reflection unit in the light path that causes the surround shift in position.At this moment, also can access and the identical effect of above-mentioned first projecting display.Also have; In the projecting display that does not have integrated optics system, projectable's coloured image; If can adjust the setting angle of the reflection unit on the light path that is configured between look combining optical and the modulating device in advance, just can access with first projecting display in identical effect during as such structure.
In the present invention's first projecting display, for can with the direction of optical axis intersection on the installation site of at least one lens board in adjustment first lens board and second lens board, can be provided for the adjusting mechanism of this adjustment.As this adjusting mechanism, for example can consider to have the structure of following mechanism: second adjusting mechanism that adjusts upward first adjusting mechanism of above-mentioned first lens board and adjust upward above-mentioned second lens board in second party in first party with above-mentioned optical axis and above-mentioned first direction quadrature with light shaft positive cross.
Adjusting mechanism as being used on assigned direction adjustment lens board installation site can adopt the structure with following array apparatus: be arranged on first side of lens board, be used to push the spring of said lens plate the 1st side and be arranged on the above-mentioned first side second side surface opposite, be used to push the screw of this second side.If adopt such adjusting mechanism, if tighten screw or loosen screw just can be on given direction the mobile lens plate, can adjust the installation site of this lens board at an easy rate.
In the adjusting mechanism that adopts spring and screw,, just can make lens board mobile equably with member seldom if adopt leaf spring as spring, push the approximate centre part of second side of lens board through screw simultaneously.
In second projecting display of the present invention, for can with the direction of optical axis intersection on the installation site of at least one optics in adjustment first optics and second optics, can be provided for the adjusting mechanism of this adjustment.Under the situation of second projecting display of the present invention, preferably integrated focusing lens array, polarization conversion device and coupled lens in advance, it is reduced an adjusting mechanism and moves.So, can adjust the installation site of three opticses simultaneously.
As the adjusting mechanism that is arranged on second projecting display of the present invention, can adopt adjusting mechanism identical mechanism with first projecting display of the invention described above.That is, can adopt structure: first adjusting mechanism that adjusts upward first optics in first party with light shaft positive cross with following mechanism; And second adjusting mechanism that adjusts upward second optics in second party with optical axis and above-mentioned first direction quadrature.Also have, the adjusting mechanism as raise lay the grain optic installation site at assigned direction can adopt the structure with following array apparatus: be arranged on first side of optics, be used to push the spring of above-mentioned optics first side; And be arranged in opposite directions on second side of above-mentioned first side, be used to push the screw of this second side; Adjusting mechanism as using spring and screw can adopt such adjusting mechanism: use leaf spring as spring, meanwhile, push the approximate centre portion of lens board second side through screw.
In not having the projecting display of integrated optics system,, can be provided for the adjusting mechanism of this adjustment in order to adjust the setting angle that is configured in the reflection unit on the light path that causes the surround shift in position.As this adjusting mechanism; When in projecting display, the optical waveguide that above-mentioned reflection unit is housed being set at least, can adopt adjusting mechanism: be used to keep above-mentioned reflection unit, can be supported in the holding plate on the above-mentioned optical waveguide rotationally with following array apparatus; Adjust the screw of above-mentioned reflection unit setting angle; And the spring that gets up above-mentioned holding plate facing to above-mentioned optical waveguide support.If adopt such adjusting mechanism,, just can change the setting angle of reflection unit at an easy rate only through the screw-in amount of adjustment screw.
Do not have integrated optics system, can the projecting display of projection of color images in, in order to adjust the setting angle of the reflection unit on the light path that is configured between look combining optical and the modulating device, can be provided for the adjusting mechanism of this adjustment.In such projecting display, as stated, can adjust the setting angle that is configured in apart from the nearest locational reflection unit of modulating device in advance, it is the most favourable that this structure to device is perhaps adjusted the precision aspect to the position of modulating device surround.Thereby, hope to be provided for adjusting the adjusting mechanism that is configured in apart from the setting angle of the nearest locational reflection unit of modulating device.As such adjusting mechanism; In projecting display, be provided with under the situation of the optical waveguide that above-mentioned color separation optical system and above-mentioned reflection unit are housed at least, can adopting adjusting mechanism: keeping above-mentioned reflection unit, can be supported in the holding plate on the above-mentioned optical waveguide rotationally with following array apparatus; Adjust the screw of above-mentioned reflection unit setting angle; And the spring that gets up above-mentioned holding plate facing to above-mentioned optical waveguide support.
Description of drawings
Fig. 1 is the figure that the face shaping of having used projecting display of the present invention is shown;
Fig. 2 (A) is for illustrating the summary plane structure chart of projecting display inner structure, and 2 (B) are its summary sectional structure chart;
Fig. 3 illustrates the summary plane structure chart that partly takes out optical unit and projecting lens unit;
Fig. 4 is the summary construction diagram that the optical system of from optical unit, taking out is shown;
Fig. 5 is the mode chart that illustrates according to the relation of the viewing area of the surround of integrated optics system and liquid crystal light valve;
Fig. 6 (A) and 6 (B) are for being illustrated in the summary sectional structure chart of the mechanism of each lens board installation site of fine setting on the left and right directions;
Fig. 7 is the key diagram that is used to illustrate according to the change in shape of the integrated optics system surround of reflection unit reflecting surface;
Fig. 8 is the figure that the mechanism of fine setting catoptron setting angle is shown, and 8 (A) are the key diagram of holding plate, and 8 (B) are the planimetric map of micro-adjusting mechanism, and 8 (C) are the sectional view of micro-adjusting mechanism;
Fig. 9 illustrates to have used another routine summary plane structure chart of projecting display optical system of the present invention;
Figure 10 (A) is for illustrating the oblique view of polarization separation cell array among Fig. 7, and 10 (B) are for being used to illustrate the key diagram according to the light beam lock out operation of this polarization separation cell array;
Figure 11 (A) and 11 (B) are for being illustrated in the summary sectional structure chart of the mechanism of the fine setting second optics installation site on the left and right directions;
Figure 12 illustrates the summary plane structure chart of an example again of having used projecting display optical system of the present invention;
Figure 13 is the key diagram that the operation of reflection type liquid crystal device among Fig. 9 is shown;
Figure 14 is the summary construction diagram with general projecting display optical system of integrated optics system;
Figure 15 illustrates the key diagram that surround and image on the liquid crystal light valve forms the relation in district.
Embodiment
Below, with reference to accompanying drawing, explain and used projection display equipment of the present invention.In the explanation below, be assumed to X, Y, Z to three directions of mutually orthogonal, be assumed to the direction that light advances to Z.
(one-piece construction)
Fig. 1 illustrates the outward appearance of this routine projecting display.This routine projecting display 1000 makes the ejaculation light from light source take out as red, blue, green each column of colour through integrated optics system and color separation optical system; Each column of colour is guided in the liquid crystal light valve corresponding to each colored configuration; According to colour picture signal it is modulated; Through look combining optical each column of colour after modulation synthetic again after, through the projecting lens enlarging projection to screen.
As shown in Figure 1, projecting display 1000 has the shell 2 of rectangular shape, this shell 2 basically by loam cake 3, go to the bottom 4 and the front shroud 5 of device specifies front constitute.The fore-end of projecting lens unit 6 protrudes outside the mediad of front shroud 5.
Fig. 2 is illustrated in the configuration relation of each inner component part of the shell 2 of projecting display 1000.As shown in Figure 2, power supply unit 7 is configured on the rear end of shell 2 inside.Light source lamp unit 8 be configured in from power supply unit 7 to device front end position adjacent on.Also have, also disposed optical unit 9.The bottom of projecting lens unit 6 is positioned the central authorities of the front portion of optical unit 9.
On the other hand, on a side of optical unit 9, disposed the interface board 11 of input, output interface circuit towards the fore-and-aft direction of device, in parallel, disposed the video substrate 12 that is loading video processing circuit.The control basal plate 13 that the device drive controlling is used is configured in the upside of light source lamp unit 8 and optical unit 9.Corresponding loudspeaker 14R and 14L are configured on the left and right corner of device front end.
The blower fan 15A of cooling usefulness is configured in the central authorities of a side above the optical unit 9, forms to cool off the circulation of using with circular flow is configured in optical unit 9 bottom surfaces with fan 15B central authorities.Also have, exhaust fan 16 is configured in the back side of light source lamp unit 8, promptly installs on the side.And, will be used for being configured in position to the auxiliary cooling fan 17 that the tempering air stream from blower fan 15A is attracted in the power supply unit 7 facing to the end of the substrate on the power supply unit 7 11 and 12.
Disk drive unit (FDD) 18 be configured in power supply unit 7 directly over, on the position in this device left side.
(optical unit and optical system)
Fig. 3 shows the situation of taking out the part of optical unit 9 and projecting lens unit 6.As shown in Figure 3, optical unit 9 constitutes the optics that makes except the prism unit 910 that constitutes this look synthesizer and is in and remains on from being clipped in the state between up and down optical waveguide 901 and 902 up and down.By means of gib screw, respectively last optical waveguide 901 and down optical waveguide 902 be fixed to loam cake 3 and go to the bottom on 4.
Fig. 4 shows the schematic configuration of the optical system of from optical unit 9, taking out.With reference to Fig. 4 relevant optical system of from optical unit 9, taking out is described.This routine optical system has: the structural detail of above-mentioned light source lamp unit 8, and promptly discharge tube 81; Even illumination optics, the integrated optics system 923 that promptly constitutes by the 1st lens board 921 and the 2nd lens board 922.This routine optical system also has: separate into each column of colour R, the G of red, green, blue, the color separation optical system 924 of B to the white light beam W that penetrates from this integrated optics system 923; Three liquid crystal light valve 925R, 925G, 925B as the light valve that each column of colour is modulated; Prism unit 910 as the look combining optical that synthesizes modulated color beam again; The projecting lens unit 6 of synthetic light beam enlarging projection on the surface of screen 100.The optical system that this is routine and then have the light-conducting system 927 of guiding the blue light beam B in each color beam that has separated through color separation optical system 924 into corresponding liquid crystal light valve 925B.
As discharge tube 81, can use halide torch, metal halide property management and xenon lamp etc.Evenly lamp optical system 923 has catoptron 931, this catoptron 931 make from the ejaculation light center optical axis direction of integrated optics system 923 device the place ahead, along the right angle orientation bending.Make first and second lens board 921 and 922 clip this catoptron 931 orthogonal thereto state configuration.
From reflecting surface 821 reflections of the ejaculation light of discharge tube 81, shine first lens board 921 as directional light through reverberator 82; Through this first lens board 921, project to respectively as the secondary souce picture on the plane of incidence of each lens that constitutes second lens board 922; Be used to the illuminated object of ejaculation optical illumination from this second lens board 922.That is, the throw light on image of each liquid crystal light valve 925R, 925G, 925B forms the district.
Color separation optical system 924 is made up of bluish-green reflecting dichroic mirror 941, green reflecting dichroic mirror 942, catoptron 943.At first, on bluish-green reflecting dichroic mirror 941, reflect blue light beam B included among the white light beam W and green beam G along right angle orientation, advance towards green reflecting dichroic mirror 942.
Red beam R is through this dichronic mirror 941, utilizes the catoptron 943 at rear that it is reflected along right angle orientation, injects to prism unit 910 over there from red beam injection part 944.On green reflecting dichroic mirror 942, on dichronic mirror 941, in the blueness and green beam B and G of reflection, have only green beam G to reflect along right angle orientation, 910 penetrate over there from green beam injection part 945 towards prism unit.Blue light beam B 927 ejaculations over there through this dichronic mirror 942 from blue light beam injection part 946 towards light-conducting system.In this example, it is equal fully to be set at the distance of each the color beam injection part 944,945,946 making from the white light beam injection part of integrated optics system 923 to color separation optical system 924.
Be configured in the red beam of color separation optical system 924 and the emitting side of green beam injection part 944 and 945 to condenser lens 951 and 952 respectively.Thereby each column of colour that penetrates from each injection part incides on condenser lens 951 and 952 and parallelization.
Make such parallelization redness and green beam R and G incide among liquid crystal light valve 925R and the 925G, it is modulated, add image information corresponding to each coloured light.That is, these light valves are carried out switch control, whereby, each coloured light through these light valves is modulated through not shown drive unit.Such drive unit can use well-known device with chapter and verse.On the other hand, make blue beam B guide corresponding liquid crystal light valve 925B into, in this light valve 925B, likewise it is modulated according to picture signal through light-conducting system 927.This routine light valve can for example use and use multi-crystal TFT as on-off element.
Light-conducting system 927 comprises condenser lens 953, light incident side catoptron 971, emitting side catoptron 972, be configured in intermediate lens 973 between catoptron 971 and the catoptron 972, be configured in the condenser lens 954 in front of the liquid crystal panel 925B.That is, because from the injection part of integrated optics system white light beam to each liquid crystal light valve 925R, 925G, 925B apart from the Smalt light beam for the longest, so the light quantity loss of blue light beam is maximum.But,, can suppress the light quantity loss of blue light beam by means of being clipped in light-conducting system 927 wherein.
Secondly, through each liquid crystal light valve 925R, 925G, 925B and each modulated color beam incides in the look combining optical 910, in system 910, synthesize.In this example, as stated, the look combining optical uses the prism unit 910 that is made up of colour splitting prism.Synthetic again here coloured image is through projecting lens unit 6, and enlarging projection is to the surface that is positioned at the screen 100 on the given position.
(the surround adjusting mechanism of liquid crystal light valve)
In this routine projecting display 1000, as shown in Figure 4, according to the illumination on the liquid crystal light valve 925 of integrated optics system 923 can also to the image of liquid crystal light valve form the district about (± Y direction) or about finely tune on (± directions X).
The relation that forms district A according to the image of surround B on the liquid crystal light valve 925 of integrated optics system 923 and liquid crystal light valve 925 is shown to Fig. 5 (A) pattern.Because the projection in zone of screen 100 generally is rectangular, so corresponding, it also is rectangular that the image of liquid crystal light valve 925 forms district A.Also follow such shape according to the even surround B of lamp optical system 923 (among the figure with the district shown in the imaginary line).
As stated, form the size of distinguishing A to the image of liquid crystal light valve 925 and be set at a little circle according to area pellucida B.In other words, around the viewing area, leave the allowance of given width.Through reserving allowance,, also make image form district A usually and be included in the B of surround even because the positioning error of opticses such as each lens board 921 of integrated optics system 923 and 922 etc. cause the formation position change of surround.
In this example, in figure shown in the arrow, can be by means of position adjusting mechanism, along perpendicular to installation site, the plane of optical axis 1a in each lens board 921 of fine setting up and down or on the left and right directions and 922.As position adjusting mechanism, can consider to have the device of leaf spring and position adjusting screw.
Fig. 6 (A) and 6 (B) use sectional view that an example of the mechanism of fine setting lens board 921 installation sites on left and right directions has been shown.Fig. 6 (B) is the S-S sectional view of Fig. 6 (A).Shown in Fig. 6 (A) and 6 (B), position adjusting mechanism 700 is arranged at and reaches on the following optical waveguide 901 and 902.Formed through optical waveguide 901 and 902 up and down: the upper wall 714 that couples together along the lower wall 713 that couples together at the upwardly extending pair of right and left vertical wall 711 of upper and lower and 712, the lower end of vertical wall 711 and 712 perpendicular to the plane of optical axis 1a, the upper end of vertical wall 711 and 712; Lens board 921 is configured in the part that is surrounded through each wall 711～714.The lower end of lens board 921 is inserted in the maintenance groove 715 that is arranged on the lower wall 713.Through fixing spring 717 (spring 717 is arranged on the lower wall 713 through screw 716) bottom of lens board 921 is pinned towards the light path upper reaches, also through fixing spring 719 (spring 719 is arranged on the upper wall 714 through screw 718) with its top towards the light path upper reaches (Z direction) pin.The top of lens board 921 suitably touches on the protuberance 710 that is arranged on the upper wall 714.Therefore, lens board 921 is under the state of having stipulated installation site up and down.On the other hand, through calibrating spring 720, utilize 1 vertical wall 711 to support lens board 921.Also push 921 towards vertical walls 711 of lens board through the adjustment screw 721 that is arranged on another vertical wall 712.Therefore, by means of the screw-in amount of adjustment adjustment screw 716, the installation site that can make lens board 921 only about (± directions X) go up and move.
Thereby; For example shown in Fig. 5 (B), the image of liquid crystal light valve 925 is formed district A, when a part that makes image form district A along the transverse direction skew as surround B can not get throwing light on; Shown in Fig. 5 (C); By means of tighten an adjustment screw 721 or with its unscrew and on left and right directions the installation site of fine setting lens board 921, the position that makes surround B is along lateral excursion, just can make image form district A and be in and be included under the interior state of surround B.
In this example, utilize the calibrating spring 720 configuration adjustment screws 721 that constitute by the leaf spring in "＜", make this adjustment screw 721 push the approximate centre portion of vertical wall 712 sides of lens board 921.Therefore, can make lens board 921 carry out moving uniformly with a small amount of member.
On the other hand; In Fig. 6 (A) and 6 (B); Do not use the adjustment screw 721 and the calibrating spring 720 that are arranged on vertical wall 711 and 712,, can realize at an easy rate as the mechanism of going up fine setting lens board 922 installation sites at above-below direction (± Y direction) through be set to adjustment screw and calibrating spring on upper wall 714 and the lower wall 713 with it identically; Therefore, omit its detailed description.
In this example, after the installation site of having finely tuned lens board 821 and 822, inject cementing agent, so that lens board 921 and 922 is fixed from cementing agent filling orifice 904a, 904b, 905a, the 905b (with reference to Fig. 3) that is arranged on the optical waveguide 901.Though fixing not necessarily like this needs,, to preventing that reliably the skew from caused lens board 921 of the impact of outside and 920 installation sites from being effective.
As the position adjusting mechanism that uses adjustment screw and calibrating spring, can certainly be not directly optical waveguide 901 and 902 up and down be provided with adjustment screw and calibrating spring, and adopts the lens carrier of other structure.
Image by means of measuring on the liquid crystal light valve 925G forms the illumination of district A periphery, and then can carry out the fine setting on left and right directions (± directions X) automatically or manually.Under state shown in Fig. 5 (B), surround B squints to the left, and the image on the liquid crystal light valve 925G forms the illumination step-down of district A right corner.For the skew of adjustment surround B like this, can go up the installation site of skew lens board 921 at left and right directions (± directions X), the left and right sides illumination P1 and the P2 that form district A up to image become certain value.But,, when changing into the little light source of light quantity, just be difficult to correspondence because this method of adjustment need preestablish certain value.
If on left and right directions the installation site of skew lens board 921, until image forms left and right sides illumination P1 and the P2 of district A becomes equally, then need not preestablish certain value, therefore, when changing into the little light source of light quantity, also can be corresponding at an easy rate.Also have, if the installation site of the lens board 921 that on left and right directions, squints becomes maximum until image forms left and right sides illumination P1 and the P2 sum of district A; Then need not preestablish certain value yet; Therefore, when changing into the little light source of light quantity, also can be corresponding at an easy rate.
Do not use the image of measuring on the liquid crystal light valve 925G to form the illumination of district A periphery; Through making liquid crystal light valve 925G be in the state that illumination light sees through in advance; Mensuration makes the illumination of this image projected image periphery during projection on screen 100, also can carry out the fine setting on the left and right directions (± directions X) automatically or manually.
If projection on screen 100 under the state shown in Fig. 5 (B), then shown in Fig. 5 (D), on district's A ' left comer that original image should project, projected image B ' projection is not come out.This be because, at the illumination step-down of this left comer part.Therefore, can be after the illumination Q1 and Q2 about the district A ' that the original image of mensuration should project, through finely tuning according to the identical method of the fine setting of the illumination photometry on the liquid crystal light valve 925G with above-mentioned.Promptly; Can be on left and right directions the installation site of lens board 921 be displaced to illumination Q1 and Q2 becomes certain value; Perhaps on left and right directions with the installation site of lens board 921 shift into illumination Q1 and Q2 become equal, can also be on left and right directions the installation site of lens board 921 be shifted into illumination Q1 and Q2 with become maximum.Moreover, as stated, become and equate or illumination Q1 and Q2 sum become maximum if on left and right directions, the installation site of lens board 921 is shifted into illumination Q1 and Q2, then when changing over the little light source of light quantity, also can be corresponding at an easy rate.
Secondly, can form the illumination up and down of district A or the illumination up and down of projected image, carry out the fine setting on above-below direction (± Y direction) automatically or manually by means of measuring image.Identical with when fine setting on left and right directions, when on above-below direction, finely tuning, the illumination that also can be on above-below direction the installation site of lens board 922 be shifted into two places becomes certain value.Also have, equate or until till the illumination sum in two places becomes maximum if become up to the illumination in two places, the installation site of skew lens board 922 on above-below direction, then when changing over the little light source of light quantity, also can be corresponding at an easy rate.
Moreover, also can replace liquid crystal light valve 925G, and be the fine setting that benchmark carries out integrated optics system 923 with other liquid crystal light valve 925R and 925B.
When finely tuning, though can move first lens board 921 and second lens board 922 simultaneously; The method of also can employing finely tuning the installation site in proper order, for example, at first at right and left first lens board 921 that moves up; Carry out the fine setting on the left and right directions; Secondly, at upper and lower second lens board 922 that moves up, carry out the fine setting on the above-below direction.But, carry out the fine setting on above-below direction earlier, after carry out the fine setting on the left and right directions, also can carry out same adjustment certainly.
In above-mentioned example, though be to make first lens board 921 finely tune on the left and right directions, second lens board 922 can be finely tuned on above-below direction,, also can this direction be reversed; Also have, a certain installation site can be finely tuned.Also can and then make first and second lens board 921 and 922 the installation site can with any direction of optical axis intersection on adjust.Like this,, just can eliminate the distortion of back surround B illustrated, shown in Figure 7, can improve the homogeneity of illumination if adjust on can be in any direction.As these the adjustment form, for example can enumerate below shown in 4 kinds of combinations.
The adjustment direction
The 1st integral lens the 2nd integral lens
(1) about about
(2) up and down
(3) fixing (can not adjust) up and down, about or any direction
(4) up and down, or any direction fix (can not adjust)
Like this, can finely tune, around liquid crystal light valve image formation district A, preestablish the allowance of broad with regard to there is no need to consider the skew of surround as before in advance by means of the installation site that makes integrated optics system.Thereby the allowance that around image formation district A, should form is minimum just can to work, so improved the utilization ratio of illumination light, the brightness that can improve projected image.
That is,,, also can eliminate the image formation shown in Fig. 5 (B) and distinguish the situation that the part of A has broken away from surround B through finely tuning the installation site of each lens board 921 and 922 even reduce allowance.Thereby, be not created on the edge of projected image and disadvantages such as shadow occur.
Surround B as integrated optics system 923 distinguishes the key factor that A squints to the image formation of liquid crystal light valve, also has the setting angle error of catoptron (being configured on the light path of each color beam) reflecting surface.Mirror reflects is 45 ° in the face of the setting angle of optical axis, still, if this angular deflection, then shown in Fig. 5 (B), the part of the district A of image formation has sometimes squinted with respect to surround B.And then, shown in Fig. 7 (A) and 7 (B), when having produced distortion among the B of surround, because the illumination in surround B left side and the uneven illumination on right side have waited, so, also can only lose the advantage of using integrated optics system 923.
Particularly in this routine projecting display 1000; Though with liquid crystal light valve 925G is that benchmark is finely tuned integrated optics system 923; But; At this moment, if the reflecting surface of catoptron shown in Figure 4 943,972,971 is not 45 ° to the setting angle of optical axis, then the surround forms the district to the image of liquid crystal light valve 925R and 925B respectively and has produced skew.Also have, when the installation site of condenser lens 953 and intermediate lens 973 was not configured on the given position, the surround had also produced skew to the image formation district of liquid crystal light valve 925B.
In this routine projecting display 1000; Except the fine setting of above-mentioned integrated optics system 923; The angle of the reflecting surface of catoptron 943 and 972 can be finely tuned incident light axis round the axis (direction of arrow among Fig. 4) perpendicular to the plane that comprises incident light axis and reflection optical axis; This catoptron 943 reflects red beam R shown in Figure 4 over there towards liquid crystal light valve 925R, and this catoptron 972 reflects blue beam B over there towards liquid crystal light valve 925B.As the adjusting mechanism of this catoptron setting angle, can consider leaf spring identical and angular setting screw with the position adjusting mechanism of above-mentioned integrated optics system 923.
Fig. 8 (A)-8 (C) shows an example of the mechanism that the setting angle of catoptron 972 is finely tuned.Fig. 8 (A) is the key diagram of the holding plate 740 of maintenance catoptron 972; Fig. 8 (B) is for seeing the figure of micro-adjusting mechanism of the setting angle of catoptron 972 from last waveguide 902; Fig. 8 (C) is the figure of the micro-adjusting mechanism of the setting angle that the T-T section is seen catoptron 972 from Fig. 8 (B).Shown in these figure, angle-adjusting mechanism 730 has support plate 740, through being arranged on maintaining part 746a and the 746b on this support plate 740, from the bottom that keeps catoptron 972 with this reflecting surface face in opposite directions.The top of catoptron 972 is fixed on the holding plate 740 through clip 748.On the middle body on these holding plate 740 surfaces, be formed on the upwardly extending axle 741 of upper and lower.Through following optical waveguide 902, can support axle 741 rotationally.Thereby catoptron 972 can be through 740 axis 1b round axle 741 that rotate specified rate of holding plate.Also have, spring suppport 744 is set on the side of holding plate 740, and the first fulcrum 742a of calibrating spring 742 inserts in this spring suppport 744.The fulcrum 742b of calibrating spring 742 and 742c suitably touch in the support sector 749 that is arranged on down on the optical waveguide 902.Thereby through calibrating spring 742, optical waveguide 902 is being supported holding plate 740 under facing toward.Utilize adjustment screw 743, the direction of arrow G is pushed the spring suppport 744 of holding plate 740 in the figure, and adjustment screw 743 is arranged on by screw 771 facing on the fixing plate 770 of optical waveguide down 902.Thereby; Insert jig from the screw operating portion 902a that is arranged on down on the optical waveguide 902; If increase the screw-in amount of adjustment screw 743; Adjustment screw 743 side of just pushing holding plate 740 along the direction of G, therefore, holding plate 740 is the axis 1b along the direction shown in the middle arrow R1 of Fig. 8 (B) round axle 741 and rotating just.Like this, can change the angle of catoptron 972 reflectings surface, become big so that incide the incident angle of the light on the catoptron 972.On the contrary; If reduce to adjust the screw-in amount of screw 743; Calibrating spring 742 just along the lateral parts of-G steering handle holding plate 740 move to own in front of, therefore, holding plate 740 is the axis 1b along the direction shown in the middle arrow R2 of Fig. 8 (B) round axle 741 and rotating just.Like this, can change the angle of catoptron 972 reflectings surface, so that reduce to incide the incident angle of the light on the catoptron 972.In other words, by means of the screw-in amount of adjustment adjustment screw 743, can be round the angle of adjusting catoptron 972 reflectings surface perpendicular to the axis on the plane that comprises incident light axis and reflection optical axis.Moreover the adjusting mechanism as the angle of adjusting other mirror reflection surface can adopt mechanism same as described above certainly.
In this example, after the setting angle of having finely tuned catoptron 943 and 972, inject cementing agent, so that catoptron 943 and 972 is fixed from cementing agent filling orifice 906a, 906b, 907a, the 907b (with reference to Fig. 3) that is arranged on the optical waveguide 901.Though fixing not necessarily like this needs,, to preventing that reliably the skew from the caused catoptron 943 of the impact of outside and 972 from being effective.
Image by means of measuring on liquid crystal light valve 925R or the 925B forms the illumination of district's periphery, and then can carry out this fine setting automatically or manually.Identical with the fine setting of said lens plate, the left and right sides illumination P1 and the P2 that can the setting angle of each catoptron 943 and 972 be displaced to always image formation district A become certain value.Also have; For the situation of light source that can be little with changing over light quantity corresponding; Can be with the setting angle of each catoptron 943 and 972, be displaced to the left and right sides illumination P1 that makes image form district A and P2 and become the left and right sides illumination P1 and the P2 sum that equate or make image form district A and become maximum.
Identical with the fine setting of lens board; The image of not measuring liquid crystal light valve 925R or 925B forms the illumination of district A periphery; Through making liquid crystal light valve 925R or 925B be in the state that illumination light sees through in advance; Mensuration makes this image illumination of projected image periphery during projection on screen 100, also can carry out the fine setting of each catoptron 943 and 972 automatically or manually.That is, if under the state shown in Fig. 7 (A) or 7 (B), on screen 100, carry out projection, then projected image about illumination become unequal; Therefore, after the illumination about the mensuration projected image, the illumination photometry situation that forms district A with image is identical; The setting angle of each catoptron 943 and 972 can squint; Until about illumination become certain value, perhaps until about illumination become equal, perhaps until about the illumination sum become maximum.
When finely tuning, though mobile mirror 943 and 972 simultaneously; The method of also can employing finely tuning setting angle in proper order; For example, at first projected image or the image formation district with liquid crystal light valve 925R is benchmark mobile mirror 943, carries out angular setting; Secondly, forming the district with the projected image of liquid crystal light valve 925B or image is benchmark mobile mirror 972, carries out angular setting.
In this example; Though be to make apart from nearest catoptron 943 of liquid crystal light valve 925R and 925B and 972 setting angle to finely tune; But; The setting angle of other optics (being the part or all in the catoptron 971 of bluish-green reflecting dichroic mirror 941, green reflecting dichroic mirror 942 and light incident side) can be finely tuned, a part or whole setting angles in other opticses that replace catoptron 943 and 972 can be finely tuned.Also have, the intermediate lens 973 of replacement catoptron 972 or the position of condenser lens 953 can be adjusted.But, shown in this example, the catoptron 943 that is configured on liquid crystal light valve 925R and the 925B proximal most position and 972 setting angle can be finely tuned, to structure or the most favourable to the precision of position adjustment.
Like this, by means of catoptron 943 and 972 can be finely tuned, around liquid crystal light valve image formation district A, preestablished the allowance of broad with regard to there is no need to consider the skew of surround as before in advance.Thereby the allowance that around image formation district A, should form is minimum just can be corresponding, so can improve the utilization ratio of illumination light, can improve the brightness of projected image.
Also have; Even reduce allowance; By means of fine setting catoptron 943 and 972 setting angle, also can eliminate the situation that a part that the image shown in Fig. 7 (A) and 7 (B) forms district A has broken away from surround B, be not created in disadvantages such as occurring shadow on the edge of projected image.
Because disappear by means of the distortion that catoptron 943 and 972 can be finely tuned just can make surround B; So; Can apply flexibly this advantage to greatest extent: can carry out even illumination, and can obtain brightness projected image very uniformly according to integrated optics system 923.
The angle-adjusting mechanism of opticses such as above-mentioned catoptron also is effective in the projecting display that does not use integrated optics system 923.
(other example one)
Below, an example of the projecting display of having used other structure of the present invention is described.The optical system of this routine projecting display 2000 has polarization illuminator, and this polarization illuminator has the polarization spectroscope of integrated optics system and special shape.In this example, about the structure identical with above-mentioned projecting display 1000, be marked with Fig. 1～Fig. 8 in used identical reference number, omit its detailed description.
Fig. 9 is the summary average structure figure of major part that the optical system of this routine projecting display 2000 is shown, and shows the structure on the XZ plane.This routine projecting display 2000 is made up of array apparatus down substantially: polarization illuminator 1, white light beam separate into three look coloured light the coloured light tripping device, based on display message each coloured light is modulated three through mode liquid-crystal apparatus forming display image, is synthesized the colorama synthesizer that forms coloured image to the coloured light of three looks and the projection optical system of this colour image projection demonstration.
Polarization illuminator 1 has the light source portion 10 that penetrates the random polarization light beam along a direction, by means of polarization conversion device 20, becomes a kind of polarized light light beam substantially to the random polarization optical beam transformation that penetrates from this light source portion 10.
Polarization conversion device is made up of first optics 200 and second optics 300.
The complex of second optics 300 for constituting by focusing lens array 310, polarized light separative element array 320, selection polarizer 380 and coupled lens 390 substantially; Be configured near the focusing picture formation position according to first optics 200; Be in the plane vertical (among Fig. 9, the XY plane) with systematic optical axis L.Moreover, under the extraordinary situation of collimation that incides the light beam on first optics 200, also can from second optics, omit focusing lens array 310.This second optics 300 has such function: after spatially being separated into P light beam and S light beam to each bar intermediate beam 202; Make the polarization direction of a certain light beam consistent with the polarization direction of another light beam, the polarization direction unanimous on the whole each bar light beam guide on the surround in a place.
The formation of focusing lens array 310 is identical substantially with first optics 200.Promptly; Focusing lens array 310 for rectangular that arranging, with the identical condenser lens 311 of number of the light beam sectioned lens 201 of formation first optics 200, focusing lens array 310 has such function: make each bar intermediate beam focus on and guide into this place in the localities polarized light separative element array 320 specific.Thereby; Hope the characteristic of contrast by means of the intermediate beam 202 of first optics, 200 formation; And consider that ideal situation is that to incide the chief ray slope of the light on the polarized light separative element array 320 parallel with systematic optical axis L, preferably respectively the focus characteristics optimization of each condenser lens.But, generally speaking, consider the cheap of optical system and be easy to design; Focusing lens array 310 uses and first optics, 200 identical devices; Perhaps, also can use its shape and light beam sectioned lens 201 condenser lens that is shaped as similar figures in the XY plane to constitute focusing lens array, therefore; In this example, use first optics 200 as focusing lens array 310.Moreover, also can be configured in (near first optics 200) on the position away from polarized light separative element array 320 to focusing lens array 310.
Shown in Figure 10 (A) and 10 (B), polarized light separative element array 320 is with rectangular a plurality of polarized light separative elements 330 of arranging.The aligning method of polarized light separative element 330 is corresponding to the lens peculiarity and the discharge method thereof of the light beam sectioned lens 201 that constitutes first optics 200.In this example; Employing has the light beam sectioned lens 201 of the concentric series of identical lens peculiarity; Because first optics 200 constitutes through lining up these lens with the orthogonal matrix shape; So polarized light separative element array 320 is also by means of on identical direction, lining up identical polarized light separative element 330 with the orthogonal matrix shape and constituting.Moreover; Under situation when the same row polarized light separative element of on the Y direction, arranging is identical polarized light separative element; Use polarized light separative element array 320 to have following advantage: can reduce the optical loss on the interface between the polarized light separative element elongated polarized light separative element constitutes lining up on the directions X on the Y direction; Meanwhile, can reduce the manufacturing cost of polarized light separative element array.
Polarized light separative element 330 is for having the quadrangular shape structure of a pair of polarized light parting plane 331 and reflecting surface 332 in inside, have inciding the effect that each bar intermediate beam on the polarized light separative element spatially separates into P light beam and S light beam.Section shape on the section shape on the XY plane of polarized light separative element 330 and the XY plane of light beam sectioned lens 201 is similar figures,, is the rectangle of growing crosswise that is.Thereby, get up polarized light parting plane 331 and reflecting surface 332 in the upward parallel configuration of transverse direction (directions X).Here; Configuration polarized light parting plane 331 and reflecting surface 332; The slope that makes 331 couples of systematic optical axis L of polarized light parting plane is about 45 ° and make reflecting surface 332 be the state parallel with the polarized light parting plane, so that and then polarized light parting plane 331 is equated with the projected area (area of the S outgoing plane of stating after equaling 334) of reflecting surface 332 on the XY plane in the projected area on the XY plane (area of the P outgoing plane of stating after equaling 333).Thereby, in this example, exist polarized light parting plane 331 district to set to become and exist the transverse width W M of district on the XY plane to equate with reflecting surface 332 at the transverse width WP on the XY plane.Moreover polarized light parting plane 331 generally can form with the multilayer dielectric film, and reflecting surface 332 can form with multilayer dielectric film or aluminium film.
The light that incides on the polarized light separative element 330 separates on polarized light parting plane 331: working direction is passed through the P light beam 335 of polarized light parting plane 331 unchangeably; And change over towards the S light beam 336 of adjacent reflecting surface 332 directions by polarized light parting plane 331 reflection, working direction.P light beam 335 passes through P outgoing plane 333 with chapter and verse, penetrates from the polarized light separative element; S polarized light 336 changes working direction once more by reflecting surface 332, becomes the state parallel substantially with P light beam 335, through S outgoing plane 334, penetrates from the polarized light separative element.Thereby; By means of the polarized light separative element; Separate into two kinds of different light beam P light beams 335 of polarization direction and S light beam 336 inciding random polarization light beam on the polarized light separative element 330, they penetrate towards identical substantially direction from different local (the P outgoing plane 333 and the S outgoing planes 334) of polarized light separative element.Because the polarized light separative element has the effect of above-mentioned that kind; So; Must guide each bar intermediate beam 202 in the district that the polarized light parting plane 331 of each polarized light separative element 330 exists into; For this reason, set each polarized light separative element 330 and the position relation of each condenser lens 311 and the lens peculiarity of each condenser lens 311, so that intermediate beam incides on the central portion of the polarized light parting plane in the polarized light separative element.Particularly; Under this routine situation; For on the central portion of the polarized light parting plane 331 of the central shaft arrangement of each condenser lens in each polarized light separative element 330, be configured in focusing lens array 310 to polarized light separative element array 320 under the state of 1/4 distance that is equivalent to polarized light separative element transverse width W that squinted on the directions X.
Explain according to Fig. 9 again.
Be arranged on the selection polarizer 380 that has disposed λ/2 polarizers regularly the outgoing plane there of polarized light separative element array 320.That is, only on P outgoing plane 333 parts of the polarized light separative element 330 that constitutes polarized light separative element array 320, dispose λ/2 polarizers; λ/2 polarizers are not set on S outgoing plane 334 parts.By means of the configuration status of such λ/2 polarizers, the P light beam that penetrates from polarized light separative element 330 receives the turning effort of polarization direction, to the conversion of S light beam through when λ/2 polarizers.On the other hand, because the S light beam that penetrates from S outgoing plane 334 is through λ/2 polarizers, so, do not change the polarization direction, remain the S light beam and through selecting polarizer 380.If conclude above-mentioned situation, be exactly, to be transformed into a kind of light beam (in this case, being the S light beam) to polarization direction intermediate beam at random by means of polarized light separative element array 320 and selection polarizer 380.
Coupled lens 390 is configured in the outgoing plane there of selecting polarizer 380, and by means of coupled lens 390, guiding on the surround of each liquid-crystal apparatus by means of the light beam of selecting the polarizer 380 consistent S of becoming light beams, coupling superposes on the surround.This coupled lens 390 is equivalent to second lens board 922 in the above-mentioned projecting display 1000.Here, coupled lens 390 also needs not be a phacoid, also can be the aggregate of a plurality of lens of second lens board, 922 that kind in first optics 200 and the above-mentioned projecting display 1000.
If conclude the function of second optics 300, be exactly, by means of second optics 300, the intermediate beam 202 that is divided into by means of first optics 200 (that is the image surface that, has cut out) stack coupling on the surround by means of light beam sectioned lens 201.Meanwhile; By means of the polarized light separative element array 320 in the way; Spatially separate into two kinds of different light beams of polarization direction to light beam (being intermediate beam) at random,, be transformed into and be roughly a kind of light beam through when selecting polarizer 380.Thereby, form the district with throw light on the equably substantially image of liquid crystal light valve of a kind of light beam almost.
That kind just as explained above; If according to this routine polarization illuminator 1; The polarization conversion device 20 that then constitutes by means of first optics 200 and second optics 300; Be transformed into a kind of light beam substantially to the random polarization light beam that penetrates from light source portion 10, have following effect simultaneously: by means of its polarization direction consistent light beam, the image of the liquid crystal light valve that can throw light on equably substantially forms the district.Also have because in the production process of light beam hardly with optical loss, so, can form the image that the light that almost all penetrates from light source portion guided liquid crystal light valve into and distinguish, thereby, have the very high characteristic of utilization ratio of light.
In this example; The focusing lens array 310 that constitutes second optics 300, polarized light separative element array 320, select polarizer 380, coupled lens 390 optically integrated; Reduce the optical loss that on these interfaces, produces, performance further improves the effect of light utilization ratio.
And then; The laterally long rectangular image of contrast forms the shape in district; The rectangle of the light beam sectioned lens 201 that constitutes first optics 200 as horizontal length; Simultaneously, penetrating two kinds of light beams as the form of separating at transverse direction (directions X) from polarized light separative element array 320.Therefore, its rectangular image that is shaped as horizontal length forms under the situation in district in illumination, does not also waste light quantity, can improve illumination efficiency (utilization ratio of light).
If merely be separated into P light beam and S light beam to polarization direction light beam at random, the width that separates the whole light beams in back generally expands 2 times to, according to this point, optical system has been maximized.But, in polarization illuminator 1 of the present invention, form a plurality of small focusing pictures by means of first optics 200; Utilize fully not exist and form the space that focuses on as producing light in the process; By means of being disposed at the reflecting surface 332 of polarized light separative element 330 in this space, that two light beams produce owing to separating into, increase towards the width of light beam transversal and to sponge, therefore; All the width of light beam does not enlarge, and has the characteristic that can realize the compact optical system.
Like this, in the projecting display 2000 that has adopted polarization illuminator 1, can use that type liquid-crystal apparatus that a kind of light beam is modulated.Thereby; Guide light beam at random into liquid-crystal apparatus if use lighting device in the past; The half the light of the intrafascicular pact of random polarization is absorbed by polarization plates (not shown) and becomes heat, and therefore, exist such problem: the utilization ratio of light is low; Meanwhile, large-scale, the cooling device that noise is big that need to suppress the polarization plates heating.But, in this routine projecting display 2000, can improve relevant issues significantly.
Promptly; In this routine projecting display 2000; In polarization illuminator 1; Only a kind of light beam (for example P light beam) is provided the rotary action of plane of polarization through λ/2 polarizers, make it to become the consistent state in polarization direction with another kind of light beam (for example S light beam).Therefore, the liquid crystal light valve 925R, 925G, the 925B that guide the consistent a kind of light beam of cardinal principle in polarization direction in 3 places are last, so; The caused light absorption of polarization plates is very little; Thereby, improved the utilization ratio of light, can access the high projected image of brightness.
In polarization illuminator 1, in second optics 300, and then spatially separate two kinds of light beams along transverse direction (directions X).Thereby, do not waste light quantity, being suitable for throwing light on, it is shaped as the rectangular liquid-crystal apparatus of growing crosswise.
In this routine polarization illuminator 1,, also can suppress the increase of polarized light separative element array 320 outgoing beam width although listed the polarisation transformation optics in.This means, when the illumination liquid-crystal apparatus, almost do not incide the light on the liquid-crystal apparatus with wide-angle.Thereby even without the great projecting lens of the little bore of F number, also can realize the projected image that brightness is high, the result can realize small-sized projecting display.
Secondly; In this routine projecting display 2000 that constitutes like this; If make in this polarization illuminator 1 included first optics 200 and at least one the installation site in second optics 300; Can with the direction of optical axis L quadrature on adjustment in advance; Just can be on direction all around fine setting according to the surround of each liquid crystal light valve 925R of polarization illuminator 1,925G, 925B, therefore, can make the image of each liquid-crystal apparatus form the district and often be positioned in the surround.
An example of the mechanism that the installation site of second optics 300 is finely tuned on above-below direction (± Y direction) here, is described.Figure 11 (A) and 11 (B) illustrate an example of the mechanism of its installation site of fine setting on above-below direction with sectional view.Figure 11 (B) is the V-V sectional view of Figure 11 (A).Shown in Figure 11 (A) and 11 (B), position adjusting mechanism 750 is arranged at up and down on the optical waveguide 901 and 902.Formed through optical waveguide 901 and 902 up and down: the upper wall 764 that couples together along the lower wall 763 that couples together at the upwardly extending pair of right and left vertical wall 761 of upper and lower and 762, the lower end of vertical wall 761 and 762 perpendicular to the plane of optical axis 1a, the upper end of vertical wall 761 and 762; Second optics 300 is configured in the part that is surrounded through each wall 761～764.The fixing spring 769 that is arranged between second optics 300 and the vertical wall 761 pins second optics 300 facing to another vertical wall 762, stipulated second optics 300 about installation site on (± directions X).The lower end of second optics 300 is inserted in the maintenance groove 768 that is arranged on the lower wall 763.The bottom of second optics 300 also through fixing spring 783 (spring 783 is fixed on the lower wall 763 through screw 781) towards the light path upper reaches (Z direction) pin, its top also through fixing spring 782 (spring 782 is fixed on the upper wall 764 through screw 780) towards the light path upper reaches (Z direction) pin.The top of second optics 300 and then suitably touch on the flange 767 that is arranged on the upper wall 764.Therefore, second optics 300 is under the state of having stipulated the installation site on the Z direction.
On the other hand,, support second optics 300 get up facing to lower wall 763 through calibrating spring 765, through being arranged on the adjustment screw 766 on the upper wall 764, second optics 300 towards the below (+Y direction) push.Thereby, by means of the screw-in amount of adjustment adjustment screw 766, can make second optics 300 about (± Y direction) go up and move.Thereby; When surround B forms a part that district A makes image form district A along vertical misalignment and can not get throwing light on the image of liquid crystal light valve 925; Through tightening adjustment screw 766 or it being loosened; The installation site of fine setting the 2nd optics 300 on above-below direction, the position that makes surround B just can make image form district A and be under the state that is included in the B of surround along vertical misalignment.
After this, by means of injecting cementing agent, fixing second optics 300 from cementing agent filling orifice 908a and the 908b that is arranged on the optical waveguide 901.Though fixing not necessarily like this needs, for preventing that reliably the skew from caused second optics of the impact of outside 300 positions from being effective.
Moreover; By means of the adjustment screw that uses shown in Figure 6 being provided with to adjust upward and the position adjusting mechanism of calibrating spring at right and left, can realize at an easy rate as about (± directions X) go up mechanisms of fine setting first optics 200 or second optics, 300 installation sites.
As the position adjusting mechanism that uses adjustment screw and calibrating spring, can certainly be not directly optical waveguide 901 and 902 up and down be provided with adjustment screw and calibrating spring, and adopts the lens carrier of other structure.
In this example, by means of available work of adjustment of position adjusting mechanism, its method of adjustment and the surround of above-mentioned each optics etc., also the situation with above-mentioned projecting display 1000 is identical.
Promptly; In this routine projecting display 2000; Installation site by means of making first optics 200 and second optics 300 can be finely tuned, and around the image of liquid-crystal apparatus forms the district, has preestablished the allowance of broad with regard to there is no need to consider the skew of surround as before in advance.Thereby the allowance that around image formation district, should form is minimum just can be corresponding, so improved the utilization ratio of illumination light, the brightness that can improve the projection in zone image.
Also have, even reduce allowance, by means of the installation site of above-mentioned each optics of fine setting, the part that also can eliminate liquid-crystal apparatus image formation district has broken away from the situation according to the surround of polarization illuminator.Thereby, be not created on the edge of projected image and disadvantages such as shadow occur.
In this example; Though the focusing lens array 310 that constitutes second optics 300, polarized light separative element array 320, select polarizer 380, coupled lens 390 optically integrated; So that reduce the optical loss on these interfaces, still, not necessarily need be integrated them.Under the incorporate situation,, can not adjust the formation position of surround to them through only adjusting the position of condenser lens 310 yet.
In this routine projecting display 2000; As the image of this liquid-crystal apparatus being formed the main cause of district's skew, can also enumerate out the setting angle error of the mirror reflection surface on the light path that is configured in each color beam according to the surround of the liquid-crystal apparatus of polarization illuminator 1.Mirror reflects is 45 ° in the face of the setting angle of optical axis, still, if this angular deflection, then shown in Fig. 7 (A) and 7 (B), in the surround, having produced distortion, the result is the image formation district that the surround has broken away from liquid-crystal apparatus.Also have, when the surround has produced distortion like this, because the illumination in left side, surround and the uneven illumination on right side have waited, so, also can only lose the advantage of using polarization illuminator 1.
Therefore; In this routine projecting display 2000; Except the fine setting of each optics of constituting above-mentioned polarization illuminator 1, the angle of the reflecting surface of the catoptron 943 that is configured on the beam path of all kinds and 972 can be finely tuned round axis (direction of arrow among Fig. 9) perpendicular to the plane that comprises incident light axis and reflection optical axis to incident light axis.Also can adjust the installation site that is configured in the relay lens 973 between catoptron 971 and 972 on the direction up and down.Moreover, as the example of mechanism of the reflecting surface angle of adjustment catoptron, the setting angle adjusting mechanism of having explained with reference to Fig. 8 is arranged.
(other example 2)
In above-mentioned two examples, as the liquid crystal light valve of liquid crystal light valve 925R, 925G, 925B use through mode, still, the present invention can be applied to use about replacing through mode the projecting display of reflection type liquid crystal device too.Therefore, an example that replaces the through mode liquid crystal light valve in the above-mentioned projecting display 2000 and adopt the projecting display of optical valve in reflection type is described.In this routine projecting display 3000, about the structure identical with above-mentioned projecting display 2000, be marked with Fig. 9～Figure 11 in used identical reference number, omit its detailed description.
Figure 12 is the summary plane structure chart of the major part of this routine projecting display 3000.
This Figure 12 is through the sectional view on the XZ plane at the center of the 2nd optics 300.
Figure 13 illustrates the example of reflection type liquid crystal device 600R, 600G, 600B.Reflection type liquid crystal device 600R, 600G, 600B are connected to the active matrix type liquid crystal device that is configured to each rectangular pixel and forms to the TFT switching device, between a pair of substrate 610 and 630, clip liquid crystal layer 620.Substrate 610 is made up of silicon, on its part, forms source electrode 611 and drains 616.Also have, on substrate 610, form: the source electrode 612 and the drain electrode 617 that constitute by aluminium lamination, the raceway groove that constitutes by silicon dioxide layer 613, by the gate electrode that silicon layer 614 and tantalum layer 615 constitute, interlayer dielectric 618, the reflective pixel electrode 619 that constitutes by aluminium lamination; On electric, couple together drain electrode 617 and reflective pixel electrode 619 through contact hole H.Because reflection pixel capacitors 619 is opaque, so, can be range upon range of reflective pixel electrode 619 on gate electrode, source electrode 612, drain electrode 617 through interlayer dielectric 618.Because can do the distance X between the adjacent pixel electrodes 619 very for a short time, so, can get aperture opening ratio greatly, can improve the brightness of projected image.Moreover, in this example, be provided with by drain electrode 616, silicon dioxide layer 613 ', silicon layer 614 ', the maintenance capacitor of tantalum layer 615 ' constitute.
On the other hand, on substrate 630 in opposite directions, on liquid crystal layer 620 face over there, form the electrode in opposite directions 631 that constitutes by ITO; On another side, form antireflection layer 632.In this example, as liquid crystal layer 620, use vertical evenly directed (superhomeotropic) material of postclimax face: during making alive (OFF), liquid crystal molecule 621 is not a vertical orientation; During making alive (ON), liquid crystal molecule 621 reverses 90 °.Therefore; As shown in Figure 4; Not during making alive (OFF); Do not change its polarization direction and just return polarization spectroscope 400 because incide reflection type liquid crystal device 600R, 600G, the last S light beam of 600B from reflection type liquid crystal device 600R, 600G, 600B from polarization spectroscope 400, so, arrive projecting lens unit 6 through 401 reflections of S light beam reflecting surface.On the other hand; During making alive (ON); Incide the last S light beam of reflection type liquid crystal device 600R, 600G, 6001B from polarization spectroscope 400 and change its polarization direction, become the P light beam, behind S light beam reflecting surface 401 by means of the torsional surface of liquid crystal molecule 621; Through projecting lens unit 6, project on the screen 100.
Explain according to Figure 12 again.Through prism unit 500, synthetic the light beam of having modulated through reflection type liquid crystal device 600R, 600G, 600B, project on the screen 100 through polarization spectroscope 400 and projecting lens unit 6.
In this routine projecting display 3000; Constituting first optics 200 of polarization conversion device 20 in the polarization illuminator 1 and the installation site of second optics 300 can move on direction up and down in perpendicular to the plane of optical axis; Like this, also can be adjusted to suitable position and shape to liquid-crystal apparatus surround according to this polarization illuminator 1.Moreover, the adjusting mechanism of these adjustable opticses in position, method of adjustment and by means of the available work of adjustment are identical with the situation of above-mentioned projecting display 2000.
Except the adjustment of surround, this routine projecting display 3000 not only can obtain and above-mentioned two effects that projecting display is identical, and, can also obtain the effect of following that kind.That is, because look tripping device and look synthesizer constitute with same prism unit, so, can make optical path length very short.Also have, because the aperture opening ratio of liquid-crystal apparatus is also big, so, can prevent the loss of light to greatest extent.Therefore, even need not bigbore projecting lens, also can obtain the very high projected image of brightness.Because by means of using first optical unit and second optical unit can obtain brightness and the uniform light beam of illumination as illumination light; So; At display surface and spread all in the scope of whole projected picture, can obtain very evenly and the very high projected image of brightness.
As reflective modulating device; Though enumerated reflection type liquid crystal device 600R, 600G, 600B in this example; But; Certainly use the reflective modulating device outside the liquid-crystal apparatus, relevant its structure, the material of its each structural detail and the working method of liquid crystal layer 620 are not limited to above-mentioned example.
If the prism with one constitutes the prism 402 of polarization spectroscope 400 and the prism 501 of formation prism unit 500, just can prevent the optical loss on these prism boundary, can improve the utilization ratio of light more.
(other example 3)
In above-mentioned three examples; Although the micro-adjusting mechanism of clear relevant optics in can the projecting display of Projection Display coloured image; But such micro-adjusting mechanism can be applied to the projecting display of the form of projection black white image too.
The configuration of relevant optical system also is not limited to above-mentioned example, even changed these configurations, does not also lose effect of the present invention.
As projecting display, over there the pre-projecting type display device of projected image, also has rear surface projection type display device from the screen viewing face from opposite lateral projection's image with the screen viewing face except what explained in this example.The present invention can certainly be applied to this back projection type device.
Institute the above, in projecting display of the present invention, the installation site of each lens board that constitutes integrated optics system can be finely tuned.Perhaps replacing the setting angle that makes the reflection unit on the light path that is configured in from the light source to the modulating device simultaneously can finely tune.Thereby, the formation position, surround of the illumination light of illumination modulating device can be finely tuned, so can be the formation set positions of surround that the image that comprises in the modulating device forms the position of distinguishing often on the direction perpendicular to optical axis.
Thereby, need not suppose that the surround forms district's skew and around image forms the district, is pre-formed big allowance the image of modulating device.Therefore, improve the utilization ratio of illumination light, can improve the brightness of projected image.Also have, because can form surround comprising on the position that image forms the district according to illumination light, so, be not created in problems such as occurring shadow on the edge of projected image.
Claims (5)
1. projecting display, comprising:
Light source;
Color separation optical system is used for the light beam that a light beam from said light source ejaculation resolves into three kinds of looks;
Three modulating devices are used for the light beam of said three kinds of looks is modulated respectively;
The look combining optical is used for the light beam of having modulated by means of said three modulating devices synthetic;
Projection arrangement is used to make by means of said look combining optical and has carried out synthetic modulated beam of light enlarging projection on the projecting plane; And
Light-conducting system; Be arranged on the light path of the longest color beam of distance from said light source to said three modulating devices; Said light-conducting system comprise the light exit side that is separately positioned on said color separation optical system and said modulating device light incident side first, second condenser lens and be arranged on the intermediate lens between said first, second condenser lens
Said projecting display is characterised in that:
Have adjusting mechanism, be used to adjust the installation site of said first, second condenser lens or said intermediate lens.
2. projecting display according to claim 1; It is characterized in that: on the light path between said light source and the said modulating device, disposed and have first lens board and second lens board that is divided into the light beam that penetrates from said light source on a plurality of lens of many intermediate beam with a plurality of condenser lenses.
3. projecting display according to claim 2 is characterized in that: at least one lens board in said first and second lens board, can with the direction of optical axis intersection on adjust the installation site.
4. according to each described projecting display in claim 1 to the claim 3; It is characterized in that: also comprise polarization conversion device; Be used for spatially separating into P light beam and S light beam to said intermediate beam respectively, the polarization direction that makes the arbitrary light beam in said P light beam and the S light beam with penetrate after the polarization direction of another light beam is consistent.
5. projecting display according to claim 4 is characterized in that: integrated said polarization conversion device and said second lens board.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1996-217652 | 1996-08-19 | ||
| JP1996217652 | 1996-08-19 | ||
| JP21765296 | 1996-08-19 | ||
| JP17745397A JP3791130B2 (en) | 1996-08-19 | 1997-07-02 | Projection display |
| JP1997-177453 | 1997-07-02 | ||
| JP1997177453 | 1997-07-02 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116055A Division CN1188907A (en) | 1996-08-19 | 1997-08-18 | Projection type display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101256341A CN101256341A (en) | 2008-09-03 |
| CN101256341B true CN101256341B (en) | 2012-10-24 |
Family
ID=39891252
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100865913A Expired - Lifetime CN101256339B (en) | 1996-08-19 | 1997-08-18 | Projection type display device |
| CN2008100865932A Expired - Lifetime CN101256341B (en) | 1996-08-19 | 1997-08-18 | Projection type display device |
| CNA2008100865928A Pending CN101256340A (en) | 1996-08-19 | 1997-08-18 | Projection type display device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100865913A Expired - Lifetime CN101256339B (en) | 1996-08-19 | 1997-08-18 | Projection type display device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100865928A Pending CN101256340A (en) | 1996-08-19 | 1997-08-18 | Projection type display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN101256339B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6115069B2 (en) * | 2012-10-17 | 2017-04-19 | セイコーエプソン株式会社 | Electronic device, control device for electronic device, driving method for electronic device, driving method for electro-optical device |
| CN105264437A (en) * | 2013-06-04 | 2016-01-20 | Nec显示器解决方案株式会社 | Illumination optical system and projector |
| JP6236975B2 (en) * | 2013-08-09 | 2017-11-29 | セイコーエプソン株式会社 | projector |
| CN109426055B (en) * | 2017-08-31 | 2021-04-06 | 深圳光峰科技股份有限公司 | Projection system |
| JP6958530B2 (en) * | 2018-10-10 | 2021-11-02 | セイコーエプソン株式会社 | Optical module and head-mounted display |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5278680A (en) * | 1989-10-05 | 1994-01-11 | Seiko Epson Corporation | Projection type liquid crystal display system and method of polarized light component projection |
| EP0676902A2 (en) * | 1994-04-04 | 1995-10-11 | Projectavision, Inc. | A high efficiency light valve projection system |
-
1997
- 1997-08-18 CN CN2008100865913A patent/CN101256339B/en not_active Expired - Lifetime
- 1997-08-18 CN CN2008100865932A patent/CN101256341B/en not_active Expired - Lifetime
- 1997-08-18 CN CNA2008100865928A patent/CN101256340A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5278680A (en) * | 1989-10-05 | 1994-01-11 | Seiko Epson Corporation | Projection type liquid crystal display system and method of polarized light component projection |
| EP0676902A2 (en) * | 1994-04-04 | 1995-10-11 | Projectavision, Inc. | A high efficiency light valve projection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101256340A (en) | 2008-09-03 |
| CN101256341A (en) | 2008-09-03 |
| CN101256339A (en) | 2008-09-03 |
| CN101256339B (en) | 2010-06-23 |
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