WO2008038539A1 - Dispositif d'éclairage plan et dispositif d'affichage à cristaux liquides utilisant celui-ci - Google Patents
Dispositif d'éclairage plan et dispositif d'affichage à cristaux liquides utilisant celui-ci Download PDFInfo
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- WO2008038539A1 WO2008038539A1 PCT/JP2007/068053 JP2007068053W WO2008038539A1 WO 2008038539 A1 WO2008038539 A1 WO 2008038539A1 JP 2007068053 W JP2007068053 W JP 2007068053W WO 2008038539 A1 WO2008038539 A1 WO 2008038539A1
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- light source
- emitted
- liquid crystal
- crystal display
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Definitions
- the present invention relates to a planar illumination device suitable for a backlight of a thin flat display used for a television or the like, and a liquid crystal display device using the same.
- a side light source type planar illumination device called an edge light that illuminates by entering from (incident surface) and emitting light from one main surface (exit surface) of the light guide plate is used.
- direct-type lighting devices with cathode fluorescent tubes or LED elements arranged in a plane are used for backlights that are large and require high brightness.
- Patent Document 1 since the configuration shown in Patent Document 1 only considers the direction of light incident on the light guide plate, the luminance becomes non-uniform when the screen becomes large, and red light, Green Color unevenness occurs due to the difference in absorption rate when light of three colors, colored light and blue light, propagates through the light guide plate.
- the power consumption can be reduced by controlling the backlight brightness, such as limiting the maximum brightness of the backlight or lowering the backlight brightness on a dark screen.
- the backlight brightness such as limiting the maximum brightness of the backlight or lowering the backlight brightness on a dark screen.
- Patent Document 1 proposes a method of lowering and a method of improving the efficiency of backlight illumination using polarized light.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2006-40639
- An object of the present invention is to provide a planar lighting device with low power consumption and high light utilization efficiency by improving the transmission efficiency of a liquid crystal display panel.
- a planar illumination device is a planar illumination device that illuminates a liquid crystal display panel having a polarizing plate on the light incident side, and emits light having a predetermined polarization direction.
- a light source and a light irradiation member that deflects light emitted from the light source and irradiates the liquid crystal display panel, and the light irradiation member has a polarization direction of light emitted from the light source that is the polarization of the liquid crystal display panel. The light emitted from the light source is deflected so as to substantially coincide with the transmission axis direction of the plate.
- the transmission efficiency of the liquid crystal display panel is improved by irradiating the liquid crystal display panel with the light emitted from the light source so that the polarization direction is substantially coincident with the transmission axis direction of the liquid crystal display panel. Therefore, power S can be used to reduce power consumption, which has high light utilization efficiency.
- FIG. 1 is a perspective view showing a schematic configuration of a planar lighting device according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view showing a schematic configuration of a liquid crystal display panel.
- FIG. 3 is a schematic diagram for explaining respective polarizations of incident light and outgoing light of a light guide plate.
- FIG. 4A is a rear view showing a schematic configuration of the planar illumination device according to the second embodiment of the present invention
- FIG. 4B is a side view thereof.
- FIG. 5 is a back view showing a schematic configuration of the planar illumination device according to the third embodiment of the present invention.
- FIG. 6 is a schematic diagram for explaining respective polarizations of incident light and outgoing light of a light guide plate used in a planar lighting device according to Embodiment 4 of the present invention.
- FIG. 7 is a cross-sectional view showing a schematic configuration of a light guide plate used in a planar lighting device according to Embodiment 5 of the present invention.
- FIG. 8A is a perspective view showing a schematic configuration of a light guide plate used in the planar lighting device according to Embodiment 6 of the present invention
- FIG. 8B is an enlarged plan view of a portion B in FIG. 8A
- FIG. 8C is an enlarged cross-sectional view of part A of FIG. 8A.
- FIG. 9 is a perspective view showing a schematic configuration of a reflector used in a planar lighting device according to Embodiment 7 of the present invention.
- FIG. 10A is a perspective view showing a schematic configuration of the display unit of the liquid crystal display device according to Embodiment 8 of the present invention
- FIG. 10B is an enlarged perspective view of a C part in FIG. 10A
- FIG. 11A is a front view showing an external appearance of a liquid crystal display device having the display unit of FIG. 10A.
- FIG. 11B is a human sensor shown in FIG. 11A, each light source unit of a backlight, and a control.
- FIG. 11C is a block diagram showing a schematic configuration of the control unit in FIG. 11B.
- FIGS. 12A and 12B are enlarged perspective views of a light source unit of a knocklight used in the liquid crystal display device according to Embodiment 9 of the present invention.
- FIG. 13 is an enlarged side view of a light source part of a backlight used in a liquid crystal display device according to Embodiment 10 of the present invention.
- FIG. 14 is a perspective view showing a schematic configuration of a display section of a liquid crystal display device according to Embodiment 11 of the present invention.
- FIG. 15A is a perspective view showing a schematic configuration of a light guide plate of a backlight used in the liquid crystal display device according to Embodiment 12 of the present invention
- FIG. 15B is an enlarged plan view of a D part in FIG. 15A.
- FIG. 16A is a side view showing a schematic configuration of a backlight used in the liquid crystal display device according to Embodiment 13 of the present invention
- FIG. 16B is a rear view thereof including an E portion of FIG. 16A.
- FIG. 1 is a perspective view showing a schematic configuration of the planar illumination device according to the first embodiment of the present invention.
- the liquid crystal display panel 6 illuminated by the planar illumination device of the present embodiment and the planar illumination device of the present embodiment.
- prism sheets 4 and 5 arranged between the liquid crystal display panel 6 and the liquid crystal display panel 6.
- the planar illumination device includes linear light source units la and lb, cylindrical lenses 2a and 2b, and a light guide plate 3.
- the linear light source unit la has two laser light sources arranged in the Y direction in the figure, and laser light from each laser light source. Is converted into linear light using, for example, a cylindrical lens (not shown) and emitted in the direction of the cylindrical lens 2a.
- Each laser light source of the linear light source unit la emits three primary colors of red light, green light, and blue light.
- the linear light source unit lb has three laser light sources arranged in the X direction in the figure, and converts the laser light from each laser light source into linear light using, for example, a cylindrical lens (not shown) to form a cylindrical lens 2b. Emits in the direction.
- Each laser light source of the linear light source section lb also emits three primary colors of red light, green light, and blue light.
- the cylindrical lenses 2a and 2b receive light emitted radially from the linear light source units la and lb, convert the incident light into substantially parallel light, and emit the light to the incident surface of the light guide plate 3. It consists of In the light guide plate 3, light emitted from the cylindrical lenses 2 a and 2 b is incident from the end face (incident surface), and the incident light is emitted from one main surface toward the liquid crystal display panel 6.
- the light guide plate 3 contains a large number of isotropic scatterers with no directionality, and incident light is reflected by optical phenomena such as reflection, scattering, refraction, and diffraction by the scatterers. It is deflected equally in all directions.
- the scatterer can be realized, for example, by containing scattering particles made of a thermosetting resin or a thermoplastic resin in the light guide plate 3 or generating bubbles or the like in the light guide plate 3.
- the linear light source unit la is configured to emit red light, green light, and blue light with polarized light in the Z direction
- the linear light source unit lb Light, green light, and blue light are each emitted with polarized light in the X direction.
- the force using a laser light source as the light source constituting the linear light source portions la and lb is not limited to this.
- An LED element that emits three primary colors of red light, green light, and blue light may be used as the light source.
- a polarizing element may be used so that the light from the LED element has polarization as with the laser light.
- FIG. 2 shows a schematic configuration of the liquid crystal display panel 6.
- a transparent electrode (not shown) and liquid crystal molecules 63 are enclosed between a glass substrate 61 and a glass substrate 62, and polarizing plates 64 and 65 having different transmission axes are provided on the light exit side and the incident side, respectively.
- the transmission axes of the polarizing plates 64 and 65 are substantially orthogonal to each other, and here, the transmission axis of the polarizing plate 65 on the light incident side is configured to be in the X direction.
- polarized light in the Z direction from the linear light source unit la is converted into substantially parallel light in the XY plane by the cylindrical lens 2a and guided to the light guide plate 3.
- the light emitted from the linear light source unit lb with the polarized light in the X direction is also converted into substantially parallel light in the XY plane by the cylindrical lens 2b and guided to the light guide plate 3.
- the light incident on the light guide plate 3 is deflected by a scatterer inside the light guide plate 3 and is emitted from the light guide plate 3.
- the scatterer since the scatterer is uniformly contained in the light guide plate 3, when substantially parallel light is incident, the light is uniformly emitted within the emission surface.
- the light emitted from the light guide plate 3 passes through the prism sheets 4 and 5 and enters the liquid crystal display panel 6.
- the prism sheet 4 is a sheet that deflects the exit angle in the X direction
- the prism sheet 5 is a sheet that deflects the exit angle in the Y direction. Accordingly, the light emitted from the light guide plate 3 is incident on the liquid crystal display panel 6 with the prism sheet 4 correcting the distribution of the emission angle in the X direction and the prism sheet 5 correcting the distribution of the emission angle in the Y direction.
- the light incident on the liquid crystal display panel is non-polarized, so the amount of light transmitted through the polarizing plate on the incident side of the liquid crystal display panel is Half of the light.
- the present embodiment most of the light emitted from the light guide plate 3 is transmitted through the polarizing plate 65 on the incident side of the liquid crystal display panel 6. The reason is explained below.
- FIG. 3 is a schematic diagram for explaining respective polarizations of light incident on the light guide plate 3 and light emitted from the light guide plate 3.
- the light emitted from the linear light source unit la enters the light guide plate 3 through the incident surface 3a of the light guide plate 3
- the light emitted from the linear light source unit lb enters the incident surface of the light guide plate 3.
- both lights are emitted from the exit surface 3c of the light guide plate 3.
- the incident surfaces 3a and 3b are two incident surfaces of the light guide plate 3 that are orthogonal to each other.
- the light incident from the incident surface 3a and the incident surface 3b is reflected or refracted and deflected by the scatterer 7, and is emitted from the output surface 3c.
- the scatterer 7 since the scatterer 7 has a non-directional shape, the light incident from the X direction and the Y direction has the same direction force and efficiency on the exit surface 3c. Light is emitted while maintaining its polarization. Even in actual measurement, such a light guide plate containing a scatterer inside, On the other hand, in the case where the light beam of parallel polarized light or vertical perpendicular polarized light is incident and incident from the end facet, It has been confirmed that more than 88% of the emitted light retains and retains the original polarized light component. .
- the incident light is incident on the polarized light in the ZZ direction from the incident incident surface 33aa.
- a large part of the emitted light is converted into outgoing and outgoing emitted light that has a polarized light surface in the XXZZ plane.
- Most of the light incident on the XX direction from the surface 33bb is incident and emitted from the polarized light in the XX direction, and is emitted and emitted from the polarized light in the XX direction. Become light. .
- Preprismatic Mussito Sheet 44 and Priurismus Mussie Tote 55 since it could not affect the polarized light in the XX direction, A large portion of the light emitted from and exiting the light guide plate 33 has a transmission and transmission axis in the XX direction.
- the light passes through the polarized light plate 6655 on the incident incident side of the display panel panel 66. . Based on the actual measurement, and assuming that more than 88% of the light passes through, it is assumed that the efficiency rate is 11 .. More than 66 times higher. .
- the light guide plate 33 has a light incident / incident surface.
- the polarization of the light emitted and emitted from the light guide light guide plate 33 is determined according to the regulation of the incident incident polarized light corresponding to the light.
- FIG. 44AA is a back and back side view showing a general schematic configuration of the surface-like illumination and illumination device apparatus according to the embodiment of the present embodiment.
- FIG. 44BB is a side side view thereof. .
- planar illumination lighting device As shown in FIGS. 44AA and BB, the planar illumination lighting device according to the embodiment of the present embodiment is as follows.
- the light source source unit 1111 synthesizes and radiates and emits the combined light of the polarized light from the 33 primary color laser light source 1111aa.
- the 11 // 22 wave wavelength long plate 1122 is a light source part, and rotates and rotates the polarized light of the light from the light source part 1111. I will. .
- the linearized opto-optic element elements 1144aa and 1144bb are composed of a lens, a lens or a lens, etc.
- the prisms 1155aa and 1155bb are configured to transmit light from the linearized optical elements 1144aa and 1144bb to the light guide plate 33. It is a spider that guides light and turns it into a parallel light beam bundle.
- the light emitted from the light source unit 11 is polarized light whose polarization plane forms approximately 45 degrees with the output plane 3c of the light guide plate 3 by the half-wave plate 12. Then, the polarized beam splitter 13 splits the P-polarized transmitted light and the S-polarized reflected light at a ratio of approximately 1: 1 and emits them.
- the light transmitted through or reflected by the polarizing beam splitter 13 is expanded into a light beam in a plane substantially parallel to the light guide plate 3 by the linear optical elements 14a and 14b, and becomes a parallel light beam by the prisms 15a and 15b. Incident on 3
- the optical axis of the half-wave plate 12 is adjusted to produce linearly polarized light in an arbitrary direction, and the polarization beam splitter 13 transmits: reflects The ratio can be changed freely.
- FIG. 5 is a back view showing a schematic configuration of the planar illumination device according to the present embodiment.
- the planar illumination device includes a light source unit 11, collimating lenses 16 and 18, an optical fiber 17, a polarization beam splitter 13, and linearized optics. Elements 14a and 14b, prisms 15a and 15b, and a light guide plate are provided.
- the light from the light source unit 11 is collected by the collimating lens 16 and is incident on the optical fiber 17 and the light emitted from the optical fiber 17 is collimated.
- the lens 18 makes the light substantially parallel and enters the polarization beam splitter 13.
- the light guided by the optical fiber 17 loses its polarization while being guided through the optical fiber 17, so that the transmitted light and the reflected light are polarized and separated approximately 1: 1 by the polarizing beam splitter 13. .
- FIG. 6 is a schematic diagram for explaining respective polarizations of light incident on the light guide plate and light emitted from the light guide plate of the planar illumination device according to the present embodiment.
- the general configuration of the surface illumination device is similar to that of the above embodiment;! To 3, the description thereof is omitted.
- each of the light incident from the incident surface 3a and the opposite surface is light polarized in the Z direction, and the light incident from the incident surface 3b is light polarized in the X direction. Therefore, in this embodiment, the light incident from the incident surface 3a and its opposite surface becomes the outgoing light having a polarization plane in the XZ plane, and the light incident from the incident surface 3b with the polarization in the X direction is X
- the output light is polarized in the direction, and the brightness of the output light can be made more uniform.
- the brightness of the emitted light can be further uniformed by making light incident from the opposite surface of the incident surface 3b.
- X-polarized light may be incident from the opposite surface of the incident surface 3b, and X-polarized light may be emitted.
- red light, blue light, and green light may be incident from different incident surfaces.
- SHG used for the green light source
- the size of the green light source is increased, so the degree of freedom in arrangement can be increased by separating the incident surface for green light only.
- there is a difference in length and width such as when the screen size is 16: 9, blue light that has a large absorption in the light guide plate is incident only from the vertical direction. Color unevenness due to differences can be reduced.
- FIG. 7 is a cross-sectional view showing a schematic configuration of a light guide plate used in the planar illumination device that is effective in the present embodiment.
- the light incident on the light guide plate 3 is repeatedly reflected between one main surface (outgoing surface) and the other main surface (reflecting surface) of the light guide plate 3, and the scatterer 7 And is gradually emitted from the exit surface. This is the same force as in the first to fourth embodiments.
- the light guide plate 3 of the present embodiment is disposed on the reflective layer 33 on the reflective surface side of the light guide plate 3 as shown in FIG.
- the polarization hologram layer 32 is provided.
- the polarization hologram layer 32 of the present embodiment is a layer that changes the polarization state of the light propagating inside the light guide plate 3, and the polarization direction thereof is the same as the transmission axis of the polarizing plate 65 of the liquid crystal display panel 6. It is set to one X direction. By doing so, the polarization of the light emitted from the light guide plate 3 can be made more uniform, and the transmission efficiency of the liquid crystal display panel 6 can be further improved.
- the polarization hologram layer 32 is arranged on the reflection surface side of the light guide plate 3.
- the polarization hologram layer 32 may be arranged on the emission surface side of the light guide plate 3 or on both the reflection surface and the emission surface. Absent.
- FIG. 8A is a perspective view showing a schematic configuration of a light guide plate used in the planar lighting device according to the present embodiment
- FIG. 8B is an enlarged plan view of a portion B in FIG. 8A
- FIG. 8B is an enlarged sectional view of a part A in FIG. 8A.
- the thickness direction of the light guide plate 8 (Z direction in the figure) is incident on the incident surfaces 8a and 8b on which light from the light source is incident. ) Is provided with an uneven shape that diffracts, refracts, or scatters incident light.
- the light incident on the light guide plate 8 travels on the opposite surface (reflecting surface) of the light guide plate 8 due to optical phenomena such as reflection, scattering, refraction, and diffraction.
- a plurality of deflecting portions 9 having a fine concavo-convex shape for changing the direction are arranged.
- the deflecting unit 9 is configured to have a reflecting surface having a normal line in the XZ plane or the YZ plane, and deflects the light incident on the light guide plate 8 and directs it to the exit surface.
- the deflecting unit 9 may be, for example, a groove formed on the reflecting surface of the light guide plate 8 by laser processing or the like, or a groove formed integrally with the light guide plate 8 at the same time.
- light from the linear light source parts la and lb in FIG. 1 is guided to the light guide plate 8 and polarized light in the Z direction from the incident surface 8a. Is incident, and polarized light in the X direction enters from the entrance surface 8b.
- the light incident from the incident surface 8a is scattered in the Z direction by the uneven shape of the incident surface 8a, and is deflected and emitted by the reflecting surface 9a having a normal line in the XZ plane of the deflecting unit 9 provided on the reflecting surface. It is emitted from the surface as polarized light in the X direction.
- the light incident from the incident surface 8b is scattered in the Z direction by the uneven shape of the incident surface 8b, and is reflected by the reflecting surface 9b having a normal line in the YZ plane of the deflecting unit 9 provided on the reflecting surface. It is deflected and emitted from the exit surface as polarized light in the X direction.
- the light emitted from the light guide plate 8 is incident on the liquid crystal display panel 6 with the emission angle distribution corrected by the prism sheet, and most of the light is incident on the incident side configured such that the transmission axis is in the X direction.
- the polarizing plate 65 is transmitted.
- the light guide plate it is possible to improve the transmission efficiency of the liquid crystal display panel by aligning the polarization of the light emitted from the planar illumination device, and to reduce the power consumption of the liquid crystal display device. realizable.
- FIG. 9 is a perspective view showing a schematic configuration of a reflector used in the planar illumination device according to the present embodiment.
- the direction of travel of the light incident from the light source is reflected by optical phenomena such as reflection, scattering, refraction, and diffraction.
- a plurality of deflecting portions 91 having fine uneven shapes to be changed are arranged.
- planar illumination device for example, light from the linear light source units la and lb in FIG. 1 is guided to the reflector 81, and polarized light in the Z direction is transmitted from the linear light source unit la.
- the X-direction polarized light enters from the linear light source unit lb.
- Light incident from the linear light source section la travels in the air on the liquid crystal display panel 6 side of the reflector and is provided on the reflector 81.
- the deflected portion 91 is deflected by the reflecting surface 91a having a normal line in the XZ plane, and is emitted as polarized light in the X direction toward the liquid crystal display panel 6 side.
- the light incident from the linear light source unit lb is propagated in the air on the liquid crystal display panel 6 side of the reflecting plate 81, and in the YZ plane of the deflecting unit 91 provided on the reflecting plate 81. Is deflected by the reflecting surface 91b having a normal line to the liquid crystal display panel 6 side, and is emitted as polarized light in the X direction.
- the transmission efficiency of the liquid crystal display panel can be improved by aligning the polarization of light emitted from the planar illumination device, as in the sixth embodiment. And a liquid crystal display device with low power consumption can be realized. In addition, high image quality can be achieved by making the luminance uniform.
- planar illumination device According to the planar illumination device according to the embodiments of the present invention !! to 7 and the liquid crystal display device using the same, by using a laser light source having high color purity and suitable for high output, In addition to realizing wide color reproducibility and a thin, large screen, it is possible to obtain significant effects such as higher image quality by uniform brightness and lower power consumption by improving light utilization efficiency.
- FIG. 10A is a perspective view showing a schematic configuration of the display unit of the liquid crystal display device according to Embodiment 8 of the present invention
- FIG. 10B is an enlarged perspective view of a C part of FIG. 1OA.
- the display unit of the liquid crystal display device is a direct type configured by arranging three primary color LED elements emitting red light, blue light, and green light on a plane.
- the backlight 101, the diffusion plate 102, and the liquid crystal display panel 103 are provided.
- the knock light 101 has light source portions 101a, 101b, and 101c in which LED elements are arranged.
- the LED element is configured such that the light source 101a emits light in the left direction and the light source 101c emits light in the right direction.
- the light source unit 101b is configured to emit light to the front.
- FIG. 11A is a front view showing the external appearance of the liquid crystal display device 104 that has the display unit of FIG. 10A, and is suitable for the present embodiment
- FIG. 11B shows the human detection sensor 105 and the backlight 101 of FIG. 11A
- FIG. 11C is a schematic diagram illustrating a connection relationship between each of the light source units 101a, 101b, and 101c and a control unit 106 that controls the light source units 101a, 101b, and 101c. It is a block diagram which shows schematic structure of these.
- the liquid crystal display device 4 is a person who detects the position of the user 123 who views the video displayed on the liquid crystal display panel 103 of the display unit of the liquid crystal display device 4.
- Sense sensor 105 is provided.
- the human sensor 105 uses, for example, electromagnetic waves for detecting the position of the user 123. After the electromagnetic wave generated from the human detection sensor 105 is reflected by the user 123, the human detection sensor 105 may detect the reflected electromagnetic wave again.
- the light source units 101a, 101b, and 101c according to the present embodiment are controlled by the control unit 106 connected to the human sensor 105 as shown in FIG. 1B.
- the control unit 106 includes a user position determination unit 1061 and an illumination condition setting unit 1062.
- the user position determination unit 1061 acquires the position information of the user 123 detected by the human sensor 105 and determines the position relationship between the liquid crystal display device 104 and the user 123 based on the position information.
- the illumination condition setting unit 1062 sets the illumination conditions of the light source units 101a, 101b, and 101c based on the determination result of the user position determination unit 1061.
- the illumination condition setting unit 1062 sets each light emission amount as each illumination condition of the light source units 101a, 101b, and 101c, and the light emission amount according to each illumination condition corresponds to each light source unit 101a, 101b, and 101c. Will emit light.
- the light emitted from each of the light source units 101 a, 101 b, and 101 c of the backlight 1 is diffused by the diffusion plate 102 and then the liquid crystal display panel.
- the transmittance of each color of red, blue, and green is controlled by the non-lens 103, and the image is displayed in color on the front surface of the liquid crystal display panel 103.
- the image displayed on the liquid crystal display panel 103 has a luminance change depending on an angle viewed by the user 123 (hereinafter referred to as “viewing angle characteristic”), and usually the luminance at the front is the highest.
- the brightness decreases as the distance from the height increases.
- the light source unit 101a of the present embodiment And 101c are configured by tilting the LED element, the viewing angle characteristics of only the light emitted from the light source 101a have a distribution in which the luminance is biased to the emission angle on the left side of the front of the screen, and only from the light source 101c.
- the emitted light has a viewing angle characteristic with a distribution opposite to that of the light from the light source unit 101a.
- a user 123 shown in FIG. 11A is located on the right side of the front of the screen of the liquid crystal display device 104.
- the human detection sensor 105 detects the user 123 located on the right side of the front of the screen of the liquid crystal display device 104, and the information is transmitted to the control unit 106.
- the user position determination unit 1061 determines that the user 123 is located on the right side of the front of the screen of the liquid crystal display device 104, and passes the determination result to the illumination condition setting unit 1062.
- the illumination condition setting unit 1062 sets the light emission amounts of the light source units 101a, 101b, and 101c so that the light emission amount of the light source unit 101c is larger than the light emission amounts of the light source units 1 Ol a and 101b. Specifically, the illumination condition setting unit 1062 sets each illumination condition so that the light emission amount of the light source unit 101c is increased and each light emission amount of the light source units 101a and 101b is decreased.
- the amount of light of the control unit 106 By controlling the amount of light of the control unit 106, the brightness of the viewing angle in the right direction of the screen is improved, the visibility of the user 123 is increased, the brightness at other angles is decreased, and the power consumption is suppressed.
- the position of user 123 is detected and controlled to increase the luminance in that direction, and the luminance in the other direction is decreased, thereby reducing the visibility. Can be improved and power consumption can be reduced.
- the present embodiment has a plurality of emission angles for each color. It has the advantage of being able to fine-tune the amount of emitted light and is wide! , Small change in color at high viewing angle, high! /, Image quality.
- the force determined by the human sensor 105 detecting the position of the user 123 may be set by the user 123 using a remote controller or the like.
- the viewing angle characteristic of the backlight 101 is controlled according to the direction of the user 123, but at the same time, according to the distance between the user 123 and the liquid crystal display device 104.
- the brightness of the cooklight 101 may be adjusted. For example, a user near the liquid crystal display device 104 If 123 is present, power consumption can be reduced by reducing the luminance in that direction.
- Embodiment 9 of the present invention will be described.
- the present embodiment has a characteristic part in the configuration of the backlight 101 of the above-described eighth embodiment, and the characteristic part will be described below. Since the other configuration of the present embodiment is the same as that of the eighth embodiment, the description thereof is omitted.
- 12A and 12B are enlarged perspective views of a light source unit of a backlight used in the liquid crystal display device according to the present embodiment.
- the backlight according to the present embodiment is configured such that light is emitted in a front direction from a light source unit 101d in which LED elements are arranged on a plane, and each LED element is provided with a light source.
- a corresponding lens array 107 is provided, and the position of the lens array 107 is controlled on a plane.
- the position of the lens array 107 is controlled by a lens array driving unit 124 that can move the lens array 107.
- the lens array driving unit 124 controls the lens array 107 according to the illumination condition set by the illumination condition setting unit 1062. Move.
- FIG. 12A shows a case where light is emitted to the front surface of the light source unit 101d
- FIG. 12B shows a case where light is emitted in the right direction of the light source unit 101d.
- the direction in which the light is emitted is changed by shifting the position of the lens array 107 in the direction a from the position in FIG. 12A.
- the viewing angle can be adjusted by moving the lens array 107 in the optical axis direction.
- a light source unit having a fixed emission direction and a light source unit having a variable emission direction may be used in combination.
- FIG. 13 is an enlarged side view of a light source unit of a backlight used in the liquid crystal display device according to the present embodiment.
- the backlight of the present embodiment has a configuration in which light emitted from the light source unit 101e is reflected by the mirror 108, and the angle of the mirror 108 is changed by rotating the mirror 108 in the direction b.
- the emission direction is controlled.
- the rotation operation of the mirror 108 is controlled by a mirror driving unit 125 that can rotate the mirror 108, and the mirror driving unit 125 rotates the mirror 108 according to the illumination condition set by the illumination condition setting unit 1062.
- a light source unit having a fixed emission direction and a light source unit having a variable emission direction may be used in combination.
- FIG. 14 is a perspective view showing a schematic configuration of a display unit of the liquid crystal display device according to the present embodiment.
- the display unit of the liquid crystal display device includes an edge light type backlight 111, a prism sheet 115, and a liquid crystal display panel 103.
- the knocklight 111 includes light source portions 112a, 112b and 112c each including an LED element or a laser light source that emits three primary colors of red light, green light, and blue light, and a light guide plate 113.
- a large number of isotropic non-directional scatterers 114 are uniformly included, and reflection, scattering, and refraction by the scatterers 114 are included.
- the incident light from the light source parts 112a, 112b and 112c is deflected equally in all directions by optical phenomena such as diffraction.
- the prism sheet 115 is a prism sheet that deflects the emission angle in the Y direction in the figure.
- the backlight 111 of the present embodiment is mounted on a liquid crystal display device similar to that of the above-described eighth embodiment, and the light source unit 11 2a is based on information from the human sensor. 112b and 112c can be controlled.
- the backlight 111 according to the embodiment includes a light emission amount adjustment unit 126 that can adjust the light emission amounts of the light source units 112a, 112b, and 112c.
- the light emission amount adjustment unit 126 is an illumination condition setting unit 1062. Each light emission amount is adjusted in accordance with the illumination condition set by.
- the light emitted from the light source units 112a, 112b, and 112c enters the light guide plate 113, is deflected by the scatterer 114 inside the light guide plate 113, and then from the light guide plate 113.
- the viewing angle characteristics of the light emitted from the light source unit 112a are negative on the X axis in the figure.
- the light emitted from the light source unit 112c has the opposite brightness.
- the light emitted from the light source 112b has a viewing angle characteristic that has a maximum luminance in front of the backlight by deflecting the emission angle by the force prism sheet 115 that has a viewing angle characteristic biased in the Y direction in the figure.
- the light from the light source sections 112a and 112c transmitted through the prism sheet 115 and the light from the light source section 112b deflected by the prism sheet 115 are transmitted through the liquid crystal display panel 103 in red, blue, and green colors.
- the rate is controlled, and the image is displayed in color on the front surface of the liquid crystal display panel 103.
- the human detection sensor 105 is on the right side of the front of the screen of the liquid crystal display device 104.
- the user 123 is detected, and the information is transmitted to the control unit 106.
- the user position determination unit 1061 determines that the user 123 is located on the right side of the front of the screen of the liquid crystal display device 104, and passes the determination result to the illumination condition setting unit 1062.
- the illumination condition setting unit 1062 sets the light emission amounts of the light source units 112a, 112b, and 112c so that the light emission amount of the light source unit 112c is larger than the light emission amounts of the light source units 112a and 112b. Specifically, the illumination condition setting unit 1062 sets each illumination condition so as to increase the light emission amount of the light source unit 112c and reduce the light emission amounts of the light source units 112a and 112b.
- the light emission amount adjusting unit 126 adjusts each light emission amount of the light source units 112a and 112b according to the illumination condition set by the illumination condition setting unit 1062.
- the luminance at the line-of-sight angle in the right direction of the screen is improved, the visibility of the user 123 is increased, the luminance at other angles is decreased, and the power consumption is suppressed.
- the position of the user is detected and detected.
- visibility can be improved and power consumption can be reduced.
- the directivity is higher than in the case of the LED element, so that the effect of increasing the luminance in the necessary direction and decreasing the luminance in the unnecessary direction is further improved.
- the directivity of the laser light in the light guide plate 113 is too high, the light incident on the light guide plate 113 is provided with irregularities that are diffracted, refracted, or scattered in the thickness direction, thereby projecting from the light guide plate 113.
- the width of the outgoing angle of the emitted light can be widened, and outgoing light with an appropriate degree of diffusion can be obtained.
- FIG. 15A is a perspective view showing a schematic configuration of a light guide plate used in the liquid crystal display device according to the present embodiment
- FIG. 15B is an enlarged plan view of a portion D in FIG. 15A.
- the light guide plate 116 has a plurality of deflections having a fine uneven shape such that light incident from different end faces is deflected and emitted in different directions.
- the portion 117 is provided on the opposite surface (reflection surface) of the emission surface.
- light sources 112a, 112b, and 112c are semiconductor laser elements, and light with high directivity is appropriately diffused by the unevenness of each incident surface of light guide plate 116. It is comprised so that it may inject. Further, the deflecting unit 117 of the reflecting surface of the light guide plate 116 is configured to have a reflecting surface having a normal line in the XZ plane or the YZ plane, and the light incident from the light source units 112a, 112b, and 112c is respectively Emits light in different directions in the XZ plane. For this reason, the same effects as those of the eleventh embodiment can be obtained.
- the light source unit is disposed outside the light guide plate.
- the light source unit is disposed on the back side of the light guide plate and deflected by a mirror or the like to guide the light guide plate. It is set as the structure which injects into.
- Figure 16A shows FIG. 16B is a side view showing a schematic configuration of the backlight 111 of the present embodiment, and FIG. 16B is a back view including the E portion of FIG. 16A.
- the backlight 11 is disposed on the back surface of the light guide plate 113 and the light guide plate 113, and synthesizes light with uniform polarization from the three primary color laser light sources.
- the directions of the optical axes of the half-wave plates 120a and 120b are controlled by the half-wave plate optical axis adjustment unit 127, and are configured to control the polarization of light from the light source units 119a and 119b. Yes.
- the half-wave plate optical axis adjustment unit 127 changes the direction of the optical axes of the half-wave plates 120a and 120b according to the illumination condition set by the illumination condition setting unit 1062.
- the polarization of the light emitted from the light source units 119a and 119b can be freely changed by the half-wave plates 120a and 120b, so that the polarized beam splitters 121a and 121b are transmitted and reflected.
- the ratio of light to be controlled can be controlled.
- the position of the user is detected, and the luminance in the unnecessary direction is reduced while the luminance in the necessary direction is sufficiently secured.
- a great effect of reducing power consumption can be obtained.
- the planar illumination device is a planar illumination device that illuminates a liquid crystal display panel having a polarizing plate on the light incident side, and emits light having a predetermined polarization direction.
- a light source and a light irradiation member that deflects light emitted from the light source and irradiates the liquid crystal display panel, and the light irradiation member has a polarization direction of light emitted from the light source that is the polarization of the liquid crystal display panel.
- the light emitted from the light source is deflected so as to substantially coincide with the transmission axis direction of the plate.
- the transmission efficiency of the liquid crystal display panel is improved by irradiating the liquid crystal display panel with the light emitted from the light source so that the polarization direction is substantially coincident with the transmission axis direction of the liquid crystal display panel Therefore, power S can be used to reduce power consumption, which has high light utilization efficiency.
- the light source has a first direction in which light emitted from the light source has a polarization direction substantially orthogonal to an irradiated surface of the polarizing plate and is incident on the light irradiation member from a transmission axis direction of the polarizing plate.
- the light source and the light emitted from the light source are incident on the light irradiation member from a direction having a polarization direction substantially parallel to the irradiated surface of the polarizing plate and perpendicular to the transmission axis direction of the polarizing plate.
- the light source preferably includes any one of a second light source, the first light source and the second light source, and the light irradiating member receives light emitted from the first light source and the second light source. It is preferable to be incident from directions orthogonal to each other.
- the polarization direction of each outgoing light from the first and second light sources can be made to substantially coincide with the transmission axis direction of the polarizing plate of the liquid crystal display panel.
- the light irradiation member includes a first end surface substantially perpendicular to a transmission axis of the polarizing plate, a second end surface orthogonal to the first end surface, and the first and second end surfaces. It is preferable that the light guide plate has a first main surface that emits each of the incident light beams and a second main surface that faces the first main surface.
- the outgoing lights from the first and second light sources are incident from two orthogonal end faces of the light guide plate, and the polarization directions of the outgoing lights are made to substantially coincide with the transmission axis direction of the liquid crystal display panel. Since the liquid crystal display panel can be irradiated, the luminance of the large area liquid crystal display panel can be made uniform and the image quality can be improved.
- the light guide plate includes a plurality of isotropic scatterers for deflecting each light emitted from the first and second light sources.
- the emitted lights from the first and second light sources are equal in all directions within the light guide plate. Since the light can be scattered, the efficiencies of the outgoing lights from the first and second light sources toward the first main surface can be made equal.
- the density of the plurality of scatterers is preferably uniform in the light guide plate.
- each of the plurality of fine shapes includes a first reflecting surface having a normal line in a virtual plane perpendicular to the first main surface and perpendicular to the first end surface, and the first main surface.
- each of the emitted light from the first and second light sources can be reflected toward the first main surface by the first and second reflecting surfaces, so the first and second light sources Each outgoing light from
- the efficiency toward the main surface of 1 can be made more equal.
- the plurality of fine shapes have the same shape and are periodically formed on the second main surface.
- the efficiencies of the outgoing lights from the two light sources toward the first main surface can be made more equal.
- the light guide plate is further disposed on the second main surface so that the polarization direction of each light emitted from the first and second light sources substantially coincides with the transmission axis direction of the liquid crystal display panel.
- the polarization directions of the respective outgoing lights from the first and second light sources can be aligned, the polarization directions of the respective outgoing lights from the first and second light sources are transmitted through the liquid crystal display panel. It can be closer to the axial direction.
- the light irradiation member includes a plane located on the liquid crystal display panel side, a first side substantially perpendicular to a transmission axis direction of the polarizing plate, and a second side orthogonal to the first side. And have sides
- the reflecting plate is preferably a reflecting plate that reflects each of the light emitted from the first and second light sources on the plane and emits the light toward the liquid crystal display panel.
- the configuration of the light irradiation member can be simplified.
- each of the plurality of fine shapes is A first reflecting surface having a normal in a virtual plane perpendicular to the plane and perpendicular to the first side; and a normal in a virtual plane perpendicular to the plane and perpendicular to the second side.
- the first and second reflection surfaces reflect the emitted light from the first and second light sources to the liquid crystal display panel side.
- the light emitted from the first and second light sources can be reflected by the first and second reflecting surfaces toward the first main surface, so the first and second light sources. It is possible to make the efficiencies of the outgoing lights from the first main surface more equal.
- the plurality of fine shapes preferably have the same shape and are periodically formed on the plane.
- a half-wave plate that rotates the polarization direction of the light emitted from the light source, and light that has passed through the half-wave plate is separated into first and second polarization components, and the first and second A polarization beam splitter that transmits light of the second polarization component and reflects light of the second polarization component, and the polarization beam splitter is disposed to face the second main surface of the light guide plate
- the first and second polarized light components is emitted as emitted light from the first light source, and the other is emitted as emitted light from the second light source.
- the light emitted from one light source can be separated and emitted as the light emitted from the first light source and the light emitted from the second light source, it is possible to reduce the number of light sources S it can.
- the polarizing beam splitter that separates the light emitted from one light source is arranged facing the second main surface of the light guide plate, the size of the device may not be increased.
- a light guide tube for guiding the light emitted from the light source, and the light guided by the light guide tube in the first and second directions.
- a polarization beam splitter that transmits the light of the first polarization component and reflects the light of the second polarization component, and the polarization beam splitter includes the polarization beam splitter of the light guide plate. It is arranged facing the second main surface, emits one of the light of the first and second polarization components as the light emitted from the first light source, and the other of the second light source It is preferable to emit as emitted light.
- the light emitted from one light source can be separated and emitted as the light emitted from the first light source and the light emitted from the second light source, so that the number of light sources is not increased. You can get two incident lights.
- the polarization beam splitter that separates the light emitted from one light source is disposed facing the second main surface of the light guide plate, the size of the apparatus is not increased.
- One of the first and second light sources! /, Shifts emit green light, and the other of the first and second light sources! /, Shifts emits red light and blue light. I prefer to do that!
- the size of the light source that emits green light is larger than that of the light source that emits red light and blue light! / Even in the case where red light and blue light are incident on the end face on which green light is incident. Since it can be separated from the edge, the degree of freedom of light source placement can be increased.
- One of the first and second light sources! / which is shifted, emits blue light, and the blue light is a short side of two sides of the first main surface that are orthogonal to each other. It is preferable that the light is incident with a directional force substantially parallel to.
- the distance that the blue light propagates in the light guide plate can be shortened, so that the attenuation of the power of the blue light in the light guide plate can be reduced.
- the light source is preferably a laser light source.
- the polarization direction of the light emitted from the light source can be made closer to the transmission axis direction of the liquid crystal display panel.
- the light source preferably includes an LED element and a polarizing element that polarizes light emitted from the LED element in a predetermined direction.
- the apparatus further includes a control unit that controls the half-wave plate, and the control unit includes the half-wave plate. It is preferable to change the ratio of the light of the first and second polarization components separated by the polarization beam splitter by rotating the polarization direction of the light emitted from the light source using a plate.
- a liquid crystal display device includes the planar illumination device described above and a liquid crystal display panel illuminated by the planar illumination device, and light emitted from the planar illumination device. Is substantially coincident with the transmission axis direction of the polarizing plate.
- the transmission efficiency of the liquid crystal display panel is improved by irradiating the liquid crystal display panel with the light emitted from the light source so that the polarization direction is substantially matched to the transmission axis direction of the liquid crystal display panel Therefore, a liquid crystal display device with low power consumption and high light utilization efficiency can be realized.
- the apparatus may further include a sensor that detects a position of a user who visually recognizes an image displayed on the liquid crystal display panel, and an adjustment unit that adjusts a light emission amount of the light source based on a detection result by the sensor. preferable.
- the light emission amount of the light source can be adjusted so as to improve the visibility of the user in accordance with the position of the user.
- planar lighting device and the liquid crystal display device using the planar lighting device according to the present invention can realize wide color reproducibility and a thin large screen, and further make the luminance of the planar lighting device uniform and improve the light use efficiency. Therefore, a liquid crystal display device with high image quality and low power consumption can be realized, which is useful in the display field.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2008536334A JP5015162B2 (ja) | 2006-09-26 | 2007-09-18 | 面状照明装置及びそれを用いた液晶表示装置 |
US12/439,435 US8040458B2 (en) | 2006-09-26 | 2007-09-18 | Planar illumination device and liquid crystal display device using the same |
CN2007800317293A CN101506573B (zh) | 2006-09-26 | 2007-09-18 | 面状照明装置及使用该面状照明装置的液晶显示装置 |
US13/231,226 US20120002136A1 (en) | 2006-09-26 | 2011-09-13 | Planar illumination device and liquid crystal display device using the same |
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JP2006-260226 | 2006-09-26 | ||
JP2006260226 | 2006-09-26 | ||
JP2006281082 | 2006-10-16 | ||
JP2006-281082 | 2006-10-16 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/231,226 Division US20120002136A1 (en) | 2006-09-26 | 2011-09-13 | Planar illumination device and liquid crystal display device using the same |
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WO2008038539A1 true WO2008038539A1 (fr) | 2008-04-03 |
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US (2) | US8040458B2 (ja) |
JP (1) | JP5015162B2 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
JP5015162B2 (ja) | 2012-08-29 |
US8040458B2 (en) | 2011-10-18 |
CN101506573B (zh) | 2011-01-12 |
CN101506573A (zh) | 2009-08-12 |
US20100014022A1 (en) | 2010-01-21 |
US20120002136A1 (en) | 2012-01-05 |
JPWO2008038539A1 (ja) | 2010-01-28 |
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