CN1580866A - Projection display optical system and its projecting method - Google Patents
Projection display optical system and its projecting method Download PDFInfo
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- CN1580866A CN1580866A CN 03152632 CN03152632A CN1580866A CN 1580866 A CN1580866 A CN 1580866A CN 03152632 CN03152632 CN 03152632 CN 03152632 A CN03152632 A CN 03152632A CN 1580866 A CN1580866 A CN 1580866A
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- light
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Abstract
The present invention relates to a projection display optical system, including a light source, an optical circuit switching device and a prism group. the prism group is placed between the optical circuit switching device and a projection device; andon the optical circuit switching device a microreflector array formed from several microreflectors is inclued; at least two gaps are formed by said prism group, so that the light entered into the prism group can produce total reflection at the interface position of first prism and gap, then is entered into the optical circuit switching device. Said invention also provides the working principle of said optical system and projection method of said projection device.
Description
Technical field
The invention relates to a kind of projection display optical system, particularly about a kind of projection display design of Optical System that can improve image contrast and projection lens visual angle simultaneously.
Background technology
The projection display generally is made up of illuminator and optical projection system.Illuminator is used for ray cast to digital micro-mirror composite set that light source is sent, have the micro-optics that independently to control in a large number on this digital micro-mirror composite set and adjust assembly, these micro-opticses are adjusted the synthetic image of component groups, are projected to display screen via projection arrangement again.Digital micro-mirror device (DigitalMicromirror Device with Texas Instrument (TI) manufacturing; DMD) be example, this micro-optics is adjusted assembly and is made of a large amount of micro-reflector, produces by control minute surface angle of inclination to make light penetration optical projection system (bright attitude) or do not penetrate two kinds of variations of optical projection system (dark attitude), thereby changes the brightness of display.
Fig. 1 is the synoptic diagram of a known projection display optical system 100.As shown in Figure 1, by the micro-reflector angle of inclination on the control figure micro-mirror device 102, can make incident light follow into direction 108 is incident in the projection arrangement 104 and constitutes a bright morphotype formula (Light-state), or depart from projection arrangement 104 along other direction 110 and penetrate and constitute a dark morphotype formula (Dark-state), change the brightness of each pixel cell in the display whereby.104 of digital micro-mirror device 102 and projection arrangements are provided with an inner full-reflection (Total Internal Reflection) prism 106, it is to be combined by two prisms 106a and 106b one clearance, interval (Air Gap) 112, by making 112 satisfied total reflection conditions of prism 106b and air gap, can guide incident light I and advance along illustrated light path.Yet, no matter this design is that the light travel path is all identical under bright attitude or the dark attitude situation, difference only in the end by the micro-reflector angle change with light incident or depart from projection arrangement 104, so limited because of the micro-reflector angle of inclination, so can cause a distinct disadvantage, be to depart from the light that projection arrangement 104 penetrates along direction 110 under the dark attitude, its part near projection arrangement 104 enters projection arrangement 104 easily and causes the image contrast variation.Enter projection lens though can elongate the veiling glare that the distance of projection arrangement 104 and prism 106 reduces dark attitude this moment, so can cause carrying on the back burnt long and be difficult for designing the projection lens of wide viewing angle.
Fig. 2 A and Fig. 2 B are the synoptic diagram of a projection display optical system 200, show another embodiment of known inner full-reflection prism design.The prism 206 of projection display optical system 200 is for three-chip type designs, difference interval one air gap 208 and air gap 210 between two adjacent ribs mirrors.Under the bright attitude shown in Fig. 2 A, incident light I is projected to digital micro-mirror device 202 according to the total reflection condition of air gap 208 and 206 formation of prism, enters projection arrangement 204 again behind the prism 206 of passing through after the reflection of the micro-reflector on the digital micro-mirror device 202.Otherwise under the dark attitude shown in Fig. 2 B, the light by the micro-reflector on the digital micro-mirror device 202 reflects can promptly reflex to the external world because of the total reflection condition of air gap 210 and 206 formation of prism and can not enter projection arrangement 204.By the design of prism 206,, make the veiling glare under the dark attitude be difficult for entering projection arrangement 204 though this way can make the light travel path that is reflected by digital micro-mirror device 202 under the dark attitude change.Yet this way can make prism 206 package thickness W thickenings, makes digital micro-mirror device 202 to the distance of projection arrangement 204 increase, and similarly can cause carrying on the back the projection lens of burnt long and difficult design wide viewing angle.
Summary of the invention
Therefore, purpose of the present invention is providing a kind of projection display illuminator, and it can effectively solve dark attitude parasitic light problem with the raising image contrast, and can shorten the burnt design in order to wide angle projection lens of the back of the body simultaneously.
According to design of the present invention, a kind of projection display optical system comprises a light source, a light path switching device and a prism group.The prism group is arranged between a light path switching device and the projection arrangement; Light path switching device includes one by micro reflector array that a plurality of micro-reflector constituted; The prism group forms at least two gaps, makes the interface of light in first prism that is met with and gap that enters the prism group produce total reflection and enter light path switching device.By adjusting the minute surface inclination angle of each micro-reflector, when micro-reflector is in bright morphotype formula, through the micro-reflector light reflected directly by the prism group and enter projection arrangement; When micro-reflector is in dark morphotype formula, produces total reflection and can't enter projection arrangement through the interface of micro-reflector light reflected in first prism that is met with and gap.
Moreover, the present invention design makes when micro-reflector is in dark morphotype formula, total reflection after taking place between the interface of prism that is close to micro reflector array and air gap in light, can be again in the prism inside surface place of contiguous micro reflector array total reflection takes place once more through the light of reflection, the incident light light path of advancing can be limited in the prism.
According to design of the present invention, the light that reflects by micro reflector array under the dark morphotype formula, when entering the prism of first experience, it can between the interface of this prism and air gap, produce total reflection, be attained at the effect that rapidly incident light of dark morphotype formula is departed from projection arrangement in the bee-line that can design, and it is burnt to shorten the back of the body significantly to reduce the whole structure dress of prism group thickness, so is easy to design the camera lens of wide viewing angle and can avoid parasitic light to enter projection lens fully.Moreover, the total reflection condition that the present invention further cooperates prism surface to produce, also the light that is reflected by micro reflector array under the dark attitude can be confined in the prism,, so can guarantee that darker attitude parasitic light does not enter the effect of projection arrangement again by its side dissipation away from the projection arrangement direction.
Description of drawings
Fig. 1 is the synoptic diagram of a known projection display optical system;
Fig. 2 A and Fig. 2 B are a projection display optical system synoptic diagram, show another embodiment of known total internal reflection prism design;
Fig. 3 is according to one embodiment of the invention, shows the synoptic diagram of a projection display optical system;
Fig. 4 A and Fig. 4 B are according to one embodiment of the invention, show the light path synoptic diagram after incident light enters the prism group, and Fig. 4 A shows the light path under the bright morphotype formula, and Fig. 4 B shows the light path under the dark morphotype formula;
Fig. 5 is a prism group and known technology example of making relatively designed according to this invention;
Fig. 6 is a synoptic diagram, shows that of prism group design of the present invention changes example.
The part symbol description:
10 shadow display optical systems
12 light sources
14 photoconductive tubes
16 relay lenss
18 prism groups
18a, 18b, 18c prism
20 light path switching devices
The 20a micro reflector array
22 projection arrangements
24,26 clearances
28 light absorbing zones
30 ellipsoid reflectings surface
100 projection display optical systems
102 digital micro-mirror devices
104 projection arrangements
106,106a, 106b prism
108 bright attitude mode light direct of travels
110 dark attitude mode light direct of travels
112 clearances
200 projection display optical systems
202 digital micro-mirror devices
204 projection arrangements
206 prisms
208,210 clearances
The I incident light
The R reflecting surface
S
1, S
2Prism surface
W, W ' prism group thickness
Embodiment
Fig. 3 is one embodiment of the invention, shows the synoptic diagram of a projection display optical system 10.Optical system 10 comprises a light source 12, a photoconductive tube 14, a relay lens 16, a prism group 18, a light path switching device 20 and a projection arrangement 22.Around the light source 12 a for example ellipsoid reflecting surface 30 of an optical collector can be set, with convergence of rays that light source 12 is sent to photoconductive tube 14, photoconductive tube 14 peripheral walls are reflecting surface, light penetrates equally distributed light beam by the photoconductive tube endpiece after reflective wall repeatedly reflects, be projected to prism group 18 via relay lens 16 again.Have on the light path switching device 20 by the formed micro reflector array 20a of multi-disc micro-reflector, inclination angle by the micro-reflector minute surface of adjusting micro reflector array 20a, can constitute the bright morphotype formula (Light-state) that light enters projection arrangement 22, or light departs from the dark morphotype formula (Dark-state) of projection arrangement 22, uses the brightness that changes each pixel cell in the display.Note that in this inclination angle of light path switching device 20 of the present invention by adjusting the micro-reflector minute surface with the advance possible pattern of light path of switching, including but not limited to above-mentioned bright attitude and dark morphotype formula, and can change according to actual demand.
Fig. 4 A and Fig. 4 B show the light path synoptic diagram after incident light I enters prism group 18 for according to prism group design of the present invention, and Fig. 4 A shows the light path under the bright morphotype formula, and Fig. 4 B shows the light path under the dark morphotype formula.According to present embodiment, prism group 18 is that the prism 18c by the prism 18b of the prism 18a of adjacent light conduit 14, adjacent light circuit switching device 20 and contiguous projection arrangement 22 is constituted, be formed with a clearance 24 between prism 18a and prism 18c, and form another clearance 26 between prism 18a and prism 18b.
The incident light I that is come by illumination end at first enters prism 18a with certain incident angle, then, incident light I is because of the inner full-reflection critical angle greater than Si Nieer law (Snell ' s law) of the incident angle at air gap 24 and the interface of prism 18a, so incident light I promptly at first is reflected onto light path switching device 20 in this interface.Shown in Fig. 4 A, when the micro reflector array 20a inclination angle on the light path switching device 20 is chosen as bright morphotype formula, through micro reflector array 20a light reflected, in regular turn via being incident to projection arrangement 22 behind air gap 26 and the air gap 24.When micro reflector array 20a inclination angle is chosen as dark morphotype formula, shown in Fig. 4 B, when micro reflector array 20a light reflected is incident to prism group 18 with another incident angle, the present invention's design makes the light reflected by micro reflector array 20a, incident angle between the interface of first prism 18b that it met with and air gap 26 is greater than the inner full-reflection critical angle of Si Nieer law (Snell ' s law), and reflected by air gap 26, be attained at the effect that rapidly incident light of dark morphotype formula is departed from projection arrangement 22 in the bee-line that can design.
Then, prism group of the present invention 18 designs make when light between the interface of prism 18b and air gap 26 total reflection takes place after, can be through the light that reflects in the surperficial S of its most contiguous micro reflector array 20a of prism 18b
1Total reflection takes place in place once more, and makes light in surperficial S because of prism 18b angle design of the present invention
1After the place once more total reflection takes place, be incident to prism 18b thereafter and remove side S
2Its incident angle so the light path of advancing of incident light can be limited among the prism 18b as shown under the dark attitude, is controlled at the side S by prism 18b all greater than critical angle at last during outer inside surface
2Shed, guarantee that dark attitude parasitic light is fully away from the effect of projection arrangement 22.Moreover, also a light absorption material can be arranged at prism 18b side to absorb the light of dissipation, for example can be in the side of prism 18b S
2Be coated with a light absorbing zone 28.
Design according to prism group 18 of the present invention, can make the light that reflects by micro reflector array 20a under the dark morphotype formula, when entering the prism of first experience, it can between the interface of this prism and air gap, produce total reflection, be attained at the effect that rapidly incident light of dark morphotype formula is departed from projection arrangement 22 in the bee-line that can design, and it is burnt to shorten the back of the body significantly to reduce the whole structure dress of prism group thickness, so is easy to design the camera lens of wide viewing angle and can avoid parasitic light to enter projection lens fully.
Moreover, the total reflection condition that the present invention further cooperates prism surface to make, also the light that is reflected by micro reflector array under the dark attitude can be confined in the prism, again with this light by the side dissipation of prism away from the projection arrangement direction, so can guarantee that darker attitude parasitic light does not enter the effect of projection arrangement.
Fig. 5 is according to the prism group of the present invention's design and known technology example of making relatively.Keeping the same terms to meet under the situation of indivedual total reflection conditions, for example adopt identical prism material, adopt same micro reflector array or the like, with regard to the prism package thickness between light path switching device and projection arrangement, as shown in Figure 5, when the package thickness W of known three-chip type prism needed 77.2mm approximately, prism group package thickness W ' of the present invention only needed 23.96mm can reach same effect.
Fig. 6 is a synoptic diagram, shows that of prism group 18 of the present invention changes example.Prism group of the present invention 18 designs only need keep air gap between adjacent prisms so that total reflection condition to be provided, and its profile and configuration relation can answer actual demand to change arbitrarily.For example, when shortening the demand of optical system light path, well known practice is to put a catoptron to change the light path of advancing of incident light in the illumination end polygamy.Yet, according to design of the present invention, the profile that can change the prism 18a of close illumination end as shown in Figure 6 makes it that reflecting surface R can be provided more, so that incident light is earlier via the total reflection of generation at the interface that enters prism 18a and gap 24 again after this reflecting surface R reflection, so can obtain the effect of change system light path equally and can be replaced in the catoptron that illumination end disposes, reach and reduce manufacturing cost and make assembling purpose more easily.
The above only is an illustrative, but not is restrictive.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be included in the application's the scope of claims.
Claims (12)
1. projection display optical system comprises:
One in order to produce the light source of a light;
One in order to receiving this light and to have the light path switching device that this light is reflexed to a plurality of switch modes of different light paths, and these a plurality of switch modes one first pattern wherein is with this light reflection and enters to a projection arrangement and one second pattern is with this light reflection and departs from this projection arrangement; With
One is arranged at the prism group between this light path switching device and this projection arrangement, it comprises one first prism, one second prism and a prism, be formed with one first gap between this first prism and this second prism, be formed with one second gap between this first prism and this prism;
Wherein this light is to enter this light path switching device through the total reflection mode, and under this first pattern of this light path switching device with this reflection ray in regular turn by this first gap and this second gap and enter this projection arrangement, under this second pattern with this reflection ray in the interface generation total reflection of this first gap and prism and depart from the direct of travel that enters this projection arrangement.
2. projection display optical system as claimed in claim 1 is characterized in that: under this second pattern in this light of the interface generation total reflection of this first gap and prism, in the prism inside surface generation total reflection of contiguous this light path switching device.
3. projection display optical system as claimed in claim 2 is characterized in that: comprise that also one is arranged at the light absorption material of this light on the light path of advancing after this inside surface generation total reflection of this prism.
4. projection display optical system as claimed in claim 3 is characterized in that: this light absorption material is for coating the light absorbing zone of a prism surface.
5. projection display optical system as claimed in claim 1, it is characterized in that: this light path switching device surface comprises one by the formed micro reflector array of a plurality of micro-reflectors, and this light path switching device is via this micro reflector array reception and reflects this light.
6. projection display optical system as claimed in claim 1 is characterized in that: comprise that also a photoconductive tube is arranged between this light source and this prism group, with this light of homogenising.
7. projection display optical system as claimed in claim 6 is characterized in that: comprise that also a relay lens is arranged between this photoconductive tube and this prism group, with this homogenising ray cast to this light path switching device.
8. the projecting method of a projection display optical system comprises the steps:
The light that one light source is sent guides to a light path switching device;
One prism group is set between this light path switching device and a projection arrangement, this prism group is included in a plurality of prisms that are formed with a gap between per two adjacent ribs mirrors, and configuration makes the light that enters this prism group in the interface generation total reflection in first prism that is met with and gap and enter this light path switching device; And
This incident light that utilizes a plurality of switch modes of this light path switching device will enter this light path switching device switches to different light paths, all die change formulas wherein be with through this light path switching device light reflected directly by this prism group and enter this projection arrangement, another switch mode be with through this light path switching device light reflected in the interface generation total reflection in first prism that is met with and gap and depart from this projection arrangement.
9. the projecting method of projection display optical system as claimed in claim 8, it is characterized in that: under this another switch mode, this prism group is to be provided with to make through this light path switching device light reflected after the interface generation total reflection in first prism that is met with and gap, again in prism inside surface generation total reflection of contiguous this light path switching device.
10. the projecting method of projection display optical system as claimed in claim 9 is characterized in that: also comprise the step that this incident light of a light absorption material after with this inside surface generation total reflection that is absorbed in this prism is set.
11. the projecting method of projection display optical system as claimed in claim 8, it is characterized in that: this light path switching device surface comprises one by the formed micro reflector array of a plurality of micro-reflectors, and this light path switching device is that minute surface inclination angle by each micro-reflector of adjusting this micro reflector array is to form different switch modes.
12. the projecting method of projection display optical system as claimed in claim 8, it is characterized in that: when this incident light enters this prism group, be after reflecting by the formed reflecting surface of an inside surface of first prism that is met with earlier again in the total reflection of generation at the interface in this prism and this gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03152632 CN1580866A (en) | 2003-08-01 | 2003-08-01 | Projection display optical system and its projecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03152632 CN1580866A (en) | 2003-08-01 | 2003-08-01 | Projection display optical system and its projecting method |
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| Publication Number | Publication Date |
|---|---|
| CN1580866A true CN1580866A (en) | 2005-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03152632 Pending CN1580866A (en) | 2003-08-01 | 2003-08-01 | Projection display optical system and its projecting method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8052284B2 (en) | 2008-04-18 | 2011-11-08 | Qisda Corporation | Projector with reduced size and higher contrast |
| CN102879840A (en) * | 2012-10-17 | 2013-01-16 | 哈尔滨量具刃具集团有限责任公司 | Reflecting prism |
| CN105403985A (en) * | 2015-12-30 | 2016-03-16 | 中国华录集团有限公司 | Miniaturized TIR prism system for DLP projector |
| CN105842970A (en) * | 2016-05-18 | 2016-08-10 | 苏州佳世达光电有限公司 | Projector |
| CN106526845A (en) * | 2015-09-15 | 2017-03-22 | 台达电子工业股份有限公司 | Display system and applicable head-mounted display thereof |
| CN107436489A (en) * | 2016-05-25 | 2017-12-05 | 台达电子工业股份有限公司 | Head mounted display |
| CN108549149A (en) * | 2018-04-10 | 2018-09-18 | 青岛海信电器股份有限公司 | TIR prism system and laser projection device |
| CN113751790A (en) * | 2020-06-05 | 2021-12-07 | 圣杰机器工业股份有限公司 | Circular sawing machine for sawing image by prism reflection |
-
2003
- 2003-08-01 CN CN 03152632 patent/CN1580866A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8052284B2 (en) | 2008-04-18 | 2011-11-08 | Qisda Corporation | Projector with reduced size and higher contrast |
| CN102879840A (en) * | 2012-10-17 | 2013-01-16 | 哈尔滨量具刃具集团有限责任公司 | Reflecting prism |
| CN102879840B (en) * | 2012-10-17 | 2016-05-04 | 哈尔滨量具刃具集团有限责任公司 | reflecting prism |
| CN106526845B (en) * | 2015-09-15 | 2018-12-25 | 台达电子工业股份有限公司 | Display system and its applicable head-mounted display |
| CN106526845A (en) * | 2015-09-15 | 2017-03-22 | 台达电子工业股份有限公司 | Display system and applicable head-mounted display thereof |
| CN105403985A (en) * | 2015-12-30 | 2016-03-16 | 中国华录集团有限公司 | Miniaturized TIR prism system for DLP projector |
| CN105403985B (en) * | 2015-12-30 | 2018-04-20 | 中国华录集团有限公司 | DLP projector miniaturization TIR prism system |
| CN105842970A (en) * | 2016-05-18 | 2016-08-10 | 苏州佳世达光电有限公司 | Projector |
| CN105842970B (en) * | 2016-05-18 | 2018-01-30 | 苏州佳世达光电有限公司 | Projector |
| CN107436489A (en) * | 2016-05-25 | 2017-12-05 | 台达电子工业股份有限公司 | Head mounted display |
| CN108549149A (en) * | 2018-04-10 | 2018-09-18 | 青岛海信电器股份有限公司 | TIR prism system and laser projection device |
| CN108549149B (en) * | 2018-04-10 | 2020-10-09 | 海信视像科技股份有限公司 | TIR prism system and laser projection device |
| CN113751790A (en) * | 2020-06-05 | 2021-12-07 | 圣杰机器工业股份有限公司 | Circular sawing machine for sawing image by prism reflection |
| CN113751790B (en) * | 2020-06-05 | 2022-09-30 | 圣杰机器工业股份有限公司 | Circular sawing machine for sawing images by prism reflection |
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