WO2011074375A1 - 液晶表示装置、バックライトユニット、透光板および導光体 - Google Patents
液晶表示装置、バックライトユニット、透光板および導光体 Download PDFInfo
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- WO2011074375A1 WO2011074375A1 PCT/JP2010/070688 JP2010070688W WO2011074375A1 WO 2011074375 A1 WO2011074375 A1 WO 2011074375A1 JP 2010070688 W JP2010070688 W JP 2010070688W WO 2011074375 A1 WO2011074375 A1 WO 2011074375A1
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- Prior art keywords
- light
- liquid crystal
- crystal display
- photoelectric conversion
- light source
- Prior art date
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 85
- 238000006243 chemical reaction Methods 0.000 claims abstract description 71
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 9
- 229910021424 microcrystalline silicon Inorganic materials 0.000 claims description 9
- 239000003086 colorant Substances 0.000 claims description 8
- 238000005286 illumination Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 20
- 238000009792 diffusion process Methods 0.000 description 10
- 239000010409 thin film Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000010408 film Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 210000005056 cell body Anatomy 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910006404 SnO 2 Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 229910001887 tin oxide Inorganic materials 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
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- 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
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/30—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules comprising thin-film photovoltaic cells
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to a liquid crystal display device, a backlight unit, a translucent plate, and a light guide.
- Patent Document 1 discloses a prior art document that discloses a liquid crystal display device that saves power by effectively using light from a backlight.
- liquid crystal display device described in Japanese Patent Application Laid-Open No. 2007-212851, a plurality of photovoltaic elements are provided over substantially the entire back surface of the backlight.
- unnecessary light that has traveled to the back side of the backlight is collected by a photovoltaic element, so that the unused light is effectively used to save power.
- the present invention has been made in view of the above-described problems, and can improve the luminance uniformity of the lighting device, and can efficiently save power, and can provide a liquid crystal display device, a backlight unit, and a light transmitting device.
- An object is to provide a plate and a light guide.
- a liquid crystal display device includes a liquid crystal display panel constituting a display surface, a light emitting layer disposed below the liquid crystal display panel on the side opposite to the display surface, and provided with a plurality of light sources, and a light emitting layer And a photoelectric conversion layer disposed between the liquid crystal display panel.
- the photoelectric conversion layer includes a plurality of photoelectric conversion units each having a light receiving surface that is formed at a position above the light source and faces away from the display surface.
- the photoelectric conversion unit is provided at a position above the light source where light with high luminance is likely to be generated, light with high luminance can be collected by the photoelectric conversion unit.
- the brightness of light incident on the liquid crystal display panel from the light emitting layer can be made uniform, and the brightness uniformity of the lighting device can be improved.
- the power generated by the photoelectric conversion unit it is possible to save power in the liquid crystal display device.
- the photoelectric conversion layer includes a light amount adjusting unit that diffuses light emitted from the light emitting layer.
- the light source has directivity in the light emitting direction, and this directivity is larger for the light component parallel to the light emitting layer than for the light component in the direction perpendicular to the light emitting layer. In this way, since light can be spread over the entire light emitting layer, the luminance of light incident on the liquid crystal display panel from the light emitting layer can be made uniform.
- the light source is a light emitting diode. By doing so, the power consumed by the light source can be reduced.
- the electric power generated by the photoelectric conversion unit is used as a light source.
- the power generated by the photoelectric conversion unit can be used as a part of the power consumed by the light source, so that power saving of the liquid crystal display device can be achieved.
- the light emitting layer includes a plurality of light guides into which light from a light source is incident. At least one photoelectric conversion unit is arranged so as to cover a boundary between adjacent light guides in a plan view. By doing so, it is possible to shield the light with high luminance emitted from the end face of the light guide and to make the luminance of the light incident on the liquid crystal display panel from the light emitting layer uniform.
- the light emitting layer includes a plurality of light guides into which light from a light source is incident.
- the light source is disposed along two opposite ends of the light guide, and the plurality of light sources include one or more light emitting light of different colors, and the end of each light guide in the arrangement direction of the light sources.
- a photoelectric conversion unit having a light receiving surface facing the inside of the light guide is provided on a side surface of the unit.
- the side end surface of the light guide can be prevented from being colored.
- the plurality of light sources include a red light emitting diode, a green light emitting diode, and a blue light emitting diode, and light from the light sources is mixed and emitted from the light emitting surface of the light guide facing the display surface.
- the light source disposed on one end side of the two opposing end portions irradiates light toward the light source disposed on the other opposite end portion.
- the luminance of light incident on the liquid crystal display panel from the light emitting layer can be made uniform.
- the photoelectric conversion unit since the photoelectric conversion unit is provided at a position above the light source where light with high luminance is likely to be generated, light with high luminance can be collected by the photoelectric conversion unit. As a result, the luminance of light incident on the liquid crystal display panel from the light emitting layer can be made uniform, and the luminance uniformity of the lighting device can be improved. In addition, by using the power generated by the photoelectric conversion unit, it is possible to save power in the liquid crystal display device.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a liquid crystal display device according to Embodiment 1 of the present invention.
- the liquid crystal display device 1 according to Embodiment 1 of the present invention includes a liquid crystal display panel 2, a backlight unit 17, and a translucent plate 12.
- the liquid crystal display panel 2 constitutes the display surface 18 of the liquid crystal display device 1.
- the backlight unit 17 is disposed below the liquid crystal display panel 2 on the side opposite to the display surface 18 side.
- the backlight unit 17 includes a light emitting layer 5 provided with a plurality of light sources 6, a photoelectric conversion layer 19 disposed above the light emitting layer 5, and the like.
- a plurality of light sources 6 are arranged in an air layer 7 in which air is sealed in a flat substrate 4.
- the light emitting layer 5 is composed of the light source 6 and the air layer 7.
- a lighting device having a wide color reproduction range can be obtained.
- the light incident on the air layer 7 from the light source 6 travels while being mixed in the air layer 7 and reaches the boundary with the photoelectric conversion layer 19.
- a translucent plate 12 is disposed above the light emitting layer 5 in which a plurality of light sources 6 are scattered.
- a glass substrate is used in the present embodiment.
- the photoelectric conversion unit 3 having a light receiving surface facing away from the display surface 18 side of the liquid crystal display device 1 is formed above the position where the light source 6 is disposed.
- the photoelectric conversion unit 3 is a thin film solar having a configuration in which a transparent conductive film 8 made of SnO 2 (tin oxide), a solar cell body 9, and a back electrode layer 10 in which a ZnO (zinc oxide) layer and an Ag layer are stacked are sequentially stacked. It is a battery.
- the solar cell body 9 is composed of a tandem-type thin film solar cell in which a first solar cell layer made of amorphous silicon and a second solar cell layer made of microcrystalline silicon are laminated.
- the first solar cell layer includes an a-Si: Hp layer, an a-Si: Hi layer, and an a-Si: Hn layer
- the second solar cell layer includes a ⁇ c-Si: Hp layer and a ⁇ c-Si: Hi layer.
- ⁇ c-Si: Hn layer but is not limited thereto.
- the solar cell main body 9 which is a thin film solar cell was produced by decomposing gaseous silicon by plasma discharge in a plasma CVD apparatus and laminating a thin silicon film on a glass substrate.
- a thin film solar cell is used for the solar cell main body 9 since the technique of the silicon thin film required when producing the liquid crystal display panel 2 can be developed horizontally on the photoelectric conversion unit 3, the liquid crystal display having the photoelectric conversion unit 3 is provided.
- the apparatus 1 can be produced efficiently.
- the photoelectric conversion unit 3 is formed at a position above each light source 6, and a space 11 is formed above the position between the light sources 6.
- air is sealed in the space 11, but a light amount adjusting unit 28 that diffuses light emitted from the light emitting layer 5 may be provided in the space 11. Since the light amount adjustment unit 28 has the same function as the diffusion plate 13, when the light amount adjustment unit 28 is provided in the space 11, the luminance uniformity of light emitted from the backlight unit 17 is improved. be able to.
- light emitted from the light emitting layer 5 may be scattered by dispersing diffusing particles in a transparent resin.
- the amount of light scattering can be changed by changing the size of the diffusing particles depending on the position or changing the density of the diffusing particles depending on the position. By doing so, the amount of light incident on the liquid crystal display panel 2 can be adjusted by the light amount adjusting unit 28.
- a diffusion plate 13 is disposed above the translucent plate 12.
- the diffusion plate 13 diffuses the light emitted from the light source 6 inside the plate and emits light from the entire main surface of the plate.
- the diffusion plate 13 can be formed using a transparent resin such as acrylic resin, polycarbonate, polystyrene, but is not limited thereto, and a material generally used as a diffusion plate can be used.
- a reflection portion 14 is formed for allowing light transmitted through the substrate 4 to enter the light emitting layer 5 again.
- the reflecting portion 14 can be formed, for example, by depositing a metal such as Al on the lower surface of the substrate 4.
- the backlight unit 17 unlike the conventional direct type backlight, there is no main component in the light emitting direction of the light source 6 in the direction perpendicular to the diffusion plate 13, in other words, no peak component of the emitted light. . In the direction parallel to the diffusion plate 13, there is a main component of the light emission direction of the light source 6.
- the light source 6 has directivity in the light emitting direction, and the directivity of the light component parallel to the light emitting layer 5 is larger than that in the direction perpendicular to the light emitting layer 5.
- the light directly incident on the photoelectric conversion layer 19 can be reduced, the luminance unevenness of the light incident on the liquid crystal display panel 2 from the light emitting layer 5 can be reduced, and the backlight unit. 17 can be reduced in thickness.
- the emission direction of the light emitted from the light source 6 is indicated by an arrow. As indicated by the arrows, the light from each light source 6 is emitted along the light emitting layer 5. That is, light is emitted from the side surface of the light source 6 provided on the substrate 4, and the emission direction is substantially parallel to the extending direction of the diffusion plate 13.
- the light emission direction from the light source 6 provided adjacent to each other is directed in the opposite direction.
- the light emission direction from the light source 6 is parallel to the light emitting layer 5, the luminance of light in the region immediately above the light source 6 is higher than the luminance of light in other regions. It can be suppressed. Furthermore, since the light emission directions from the two adjacent light sources 6 are different from each other, the light can be spread to every corner of the light emitting layer 5. As described above, the light emitted from the light emitting layer 5 can be obtained by disposing the photoelectric conversion unit 3 directly above the light source 6 where the luminance is increased while reducing the difference in luminance between the light source 6 and other regions. Can be made uniform in brightness.
- the main emission direction of light from the light source 6 is completely parallel to the boundary surface between the light emitting layer 5 and the photoelectric conversion layer 19, but such a configuration is not necessarily required. It is not limited to. That is, the light source 6 has directivity, and the directivity is determined between the light emitting layer 5 and the photoelectric conversion layer 19 by the light component in the direction perpendicular to the boundary surface between the light emitting layer 5 and the photoelectric conversion layer 19. It is sufficient if the light component in the direction parallel to the boundary surface is larger.
- a light emitting diode is used as a light source. Further, in order to efficiently emit light emitted from the light emitting diode, a mold resin (not shown), a package (not shown) for holding the mold resin, and an electrode (not shown) for energizing the light emitting diode are provided. By using a light emitting diode as the light source 6, the power consumption of the backlight unit 17 can be reduced and the life of the light source 6 can be extended.
- the electric power generated by the photoelectric conversion unit 3 was stored in a power storage device (not shown) and used for driving the light source 6. In this way, by using the electromotive force obtained by the photoelectric conversion unit 3 as the light source 6, it is possible to save power in the liquid crystal display device 1. Further, the electromotive force obtained by the photoelectric conversion unit 3 may be used for driving a device mounted on the liquid crystal display device 1.
- the photoelectric conversion unit 3 is provided at a position above the light source 6 where uneven luminance is likely to occur, the luminance of light incident on the liquid crystal display panel 2 from the light emitting layer 5 is uniform.
- the luminance uniformity of the backlight unit 17 can be improved. Light with high luminance can be collected and generated by the photoelectric conversion unit 3, and power saving of the liquid crystal display device 1 can be achieved.
- Embodiment 2 of the present invention will be described with reference to the drawings.
- the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is not repeated.
- FIG. 2 is a cross-sectional view schematically showing a configuration of a liquid crystal display device according to Embodiment 2 of the present invention.
- the light emitting layer 27 includes a plurality of light guides 15 into which light from the light source 6 is incident.
- the photoelectric conversion unit 3 is disposed so as to cover the boundary between the adjacent light guides 15.
- all the photoelectric conversion units 3 are formed so as to cover the boundary between the adjacent light guides 15, but at least one photoelectric conversion unit 3 is formed between the adjacent light guides 15. What is necessary is just to be formed so that a boundary may be covered.
- the light incident on the light guide 15 from the light source 6 proceeds to the boundary with the photoelectric conversion layer 19 while repeating total reflection in the light guide 15. Each time light is totally reflected in the light guide 15, the intensity of the light decreases. Therefore, the intensity of light totally reflected a plurality of times in the light guide 15 is reduced.
- the light guide 15 having the tile structure As in the liquid crystal display device 20 of the present embodiment, in the light guide 15 having the tile structure, a part of the light incident on the light guide 15 from the light source 6 is adjacent to the light guide 15 without being totally reflected. The boundary between the light guides 15 to be reached is reached. Since some of the light 16 is not totally reflected in the light guide 15, the light intensity is high. Therefore, the light emitted from the gap between the adjacent light guides 15 includes strong light, and when the light is incident on the liquid crystal display panel 2 as it is, the light emitted from the backlight unit Luminance uniformity is impaired.
- the photoelectric conversion unit 3 is disposed so as to cover the boundary between the adjacent light guides 15 in plan view. For this reason, since the light with high luminance emitted from the gap between the adjacent light guides 15 is collected by the photoelectric conversion unit 3, the luminance uniformity of the light incident on the liquid crystal display panel 2 is improved. Can do.
- the photoelectric conversion unit 3 is provided at a position above the light source 6 where uneven brightness is likely to occur, the luminance of light incident on the liquid crystal display panel 2 from the light emitting layer 27 is uniform.
- the luminance uniformity of the backlight unit 26 can be improved. Light with high luminance can be received and generated by the photoelectric conversion unit 3, and power saving of the liquid crystal display device 20 can be achieved.
- Embodiment 3 of the present invention will be described with reference to the drawings.
- the same configurations as those in the first or second embodiment are denoted by the same reference numerals, and the description thereof is not repeated.
- FIG. 3 is a plan view schematically showing the configuration of the light guide according to Embodiment 3 of the present invention.
- the light emitting layer 27 includes the light guide 15 into which light from the light source is incident, as in the second embodiment.
- the light source 6 is disposed along two opposing ends of the light guide 15.
- the plurality of light sources 6 include one or more light sources that emit light of different colors, and a light receiving surface facing the inside of the light guide 15 is provided on the side surface of the end of each light guide 15 in the arrangement direction of the light sources 6.
- the photoelectric conversion part 24 which has is provided.
- the photoelectric conversion unit 24 is a thin film solar having a configuration in which a transparent conductive film 21 made of SnO 2 (tin oxide), a solar cell main body 22, a back electrode layer 23 in which a ZnO (zinc oxide) layer and an Ag layer are stacked are sequentially stacked. It is a battery.
- the solar cell main body 22 is composed of a tandem-type thin film solar cell in which a first solar cell layer made of amorphous silicon and a second solar cell layer made of microcrystalline silicon are laminated.
- the first solar cell layer includes an a-Si: Hp layer, an a-Si: Hi layer, and an a-Si: Hn layer
- the second solar cell layer includes a ⁇ c-Si: Hp layer and a ⁇ c-Si: Hi layer.
- ⁇ c-Si: Hn layer but is not limited thereto.
- the solar cell main body 22 which is a thin film solar cell was produced by decomposing gaseous silicon by plasma discharge in a plasma CVD apparatus and laminating a thin silicon film on a glass substrate.
- a thin film solar cell is used for the solar cell main body 22
- the technology of the silicon thin film necessary for manufacturing the liquid crystal display panel 2 can be horizontally developed in the photoelectric conversion unit 24. Therefore, the liquid crystal display having the photoelectric conversion unit 24 is provided.
- the apparatus 1 can be produced efficiently.
- the angle characteristics of the emission luminance of the light-emitting diode that is the light source 6 do not necessarily emit with uniform luminance at any angle, but the luminance of the light emitted in the front direction is the highest, and the angle from the front direction is Luminance decreases as it increases.
- the light emitted diagonally to the right from each light source 6 from the left side is mixed, but since there is no light source 6 on the right side, the light emitting diode arranged on the rightmost side.
- the amount of light of colors other than the color of is reduced.
- the light emitted to the right side from the rightmost light emitting diode is totally reflected on the right end surface. Thereby, the light quantity of the color of the rightmost light emitting diode increases. For this reason, there is a problem in that the color of the light emitting diode arranged at the end is colored on the side end face of the light guide 15.
- the photoelectric conversion unit 24 is provided on the side surface of the end of the light guide 15 in the arrangement direction of the light sources 6.
- the light incident on the light guide 15 from the light source 6 is collected by the photoelectric conversion unit 24 without being totally reflected at the end side surface of the light guide 15.
- the amount of light emitted from the light source 6 disposed at the end portion of the light guide 15 is reduced, and therefore, depending on the color of the light source 6 disposed at the end among the light sources 6 disposed side by side. Coloring can be reduced.
- uniform white light is radiate
- the light source 6 disposed on one end side of the two facing end portions irradiates light toward the light source 6 disposed on the other facing end portion.
- positioned along with the two opposing edge parts of each light guide 15 can irradiate light so that the area
- uniform light can be irradiated from the entire light emitting surface 25 of the light guide 15. Since other configurations are the same as those of the second embodiment, description thereof will not be repeated.
- 1,20 liquid crystal display device 1,20 liquid crystal display device, 2 liquid crystal display panel, 3,24 photoelectric conversion unit, 4 substrate, 5,27 light emitting layer, 6 light source, 7 air layer, 8,21 transparent conductive film, 9,22 solar cell body, 10 , 23 Back electrode layer, 11 space, 12 translucent plate, 13 diffuser plate, 14 reflector, 15 light guide, 16 light, 17, 26 backlight unit, 18 display surface, 19 photoelectric conversion layer, 25 light emitting surface, 28 Light quantity adjustment unit.
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Abstract
Description
れているため、光電変換部により輝度の高い光を回収することができる。その結果、発光層から液晶表示パネルに入射する光の輝度を均一にして、照明装置の輝度均一性を向上させることができる。また、光電変換部が発電した電力を利用することにより、液晶表示装置の省電力化を図ることができる。
図1は、本発明の実施形態1に係る液晶表示装置の構成を模式的に示す断面図である。図1に示すように、本発明の実施形態1に係る液晶表示装置1は、液晶表示パネル2、バックライトユニット17および透光板12を備えている。
図2は、本発明の実施形態2に係る液晶表示装置の構成を模式的に示す断面図である。図2に示すように、本実施形態に係る液晶表示装置20においては、発光層27は、光源6からの光が入射される複数の導光体15を備えている。
図3は、本発明の実施形態3に係る導光体の構成を模式的に示す平面図である。本実施形態に係る導光体15は、実施形態2と同様に、発光層27は、光源からの光が入射される導光体15を備えている。
Claims (17)
- 表示面(18)を構成する液晶表示パネル(2)と、
前記液晶表示パネル(2)の前記表示面(18)側とは反対側である下方に配置され、複数の光源(6)が設けられた発光層(5,27)と、
前記発光層(5,27)と前記液晶表示パネル(2)との間に配置された光電変換層(19)と
を備え、
前記光電変換層(19)は、前記光源(6)の上方の位置に形成された、前記表示面(18)側とは反対側に向いた受光面を有する複数の光電変換部(3)を含む、液晶表示装置(1,20)。 - 前記光電変換層(19)は、前記発光層(5,27)から発光された光を拡散させる光量調節部(28)を含む、請求の範囲第1項に記載の液晶表示装置(1,20)。
- 前記光源(6)は、その発光方向に指向性を有し、該指向性は、前記発光層(5,27)に垂直な方向の光の成分よりも前記発光層(5,27)に平行な光の成分の方が大きい、請求の範囲第1項または第2項に記載の液晶表示装置(1,20)。
- 前記光源(6)が発光ダイオードである、請求の範囲第3項に記載の液晶表示装置(1,20)。
- 前記光電変換部(3)により発電された電力を前記光源(6)に利用する、請求の範囲第1項から第4項のいずれかに記載の液晶表示装置(1,20)。
- 前記光電変換部(3)は、アモルファスシリコンからなる太陽電池層と、微結晶シリコンからなる太陽電池層とが積層されたタンデム構造を含む、請求の範囲第1項から第5項のいずれかに記載の液晶表示装置(1,20)。
- 前記発光層(27)は、前記光源(6)からの光が入射される複数の導光体(15)を備え、
少なくとも1つの前記光電変換部(3)が、平面的に見て、隣接する前記導光体(15)同士の境界を覆うように配置された、請求の範囲第1項から第6項のいずれかに記載の液晶表示装置(20)。 - 前記発光層(27)は、前記光源(6)からの光が入射される複数の導光体(15)を備え、
前記光源(6)は、前記導光体(15)の互いに対向する2つの端部に沿って配置され、
複数の前記光源(6)は、異なる色の光を発光するものを1つ以上含み、
前記光源(6)の配列方向における各前記導光体(15)の端部の側面には、前記導光体(15)の内側に向いた受光面を有する光電変換部(24)が設けられた、請求の範囲第1項から第6項のいずれかに記載の液晶表示装置(20)。 - 複数の前記光源(6)が、赤色発光ダイオード、緑色発光ダイオードおよび青色発光ダイオードを含み、
前記表示面(18)に対向する前記導光体(15)の発光面から、前記光源(6)からの光が混色されて出射される、請求の範囲第8項に記載の液晶表示装置(20)。 - 前記対向する2つの端部のうちの一方の端部側に配置された前記光源(6)は、対向する他方の端部に配置された前記光源(6)に向かって光を照射する、請求の範囲第9項に記載の液晶表示装置(20)。
- 複数の光源(6)が設けられた発光層(5,27)と、
前記発光層(5,27)の上方に配置された光電変換層(19)と
を備え、
前記光電変換層(19)は、前記光源(6)の上方の位置に形成された、表示面(18)側とは反対側に向いた受光面を有する複数の光電変換部(3)を含む、バックライトユニット(17,26)。 - 前記発光層(27)は、前記光源(6)からの光が入射される複数の導光体(15)を備え、
少なくとも1つの前記光電変換部(3)が、平面的に見て、隣接する前記導光体(15)同士の境界を覆うように配置された、請求の範囲第11項に記載のバックライトユニット(26)。 - 前記発光層(27)は、前記光源(6)からの光が入射される複数の導光体(15)を備え、
前記光源(6)は、前記導光体(15)の互いに対向する2つの端部に沿って配置され、
複数の前記光源(6)は、異なる色の光を発光するものを1つ以上含み、
前記光源(6)の配列方向における各前記導光体(15)の端部の側面には、前記導光体(15)の内側に向いた受光面を有する光電変換部(24)が設けられた、請求の範囲第11項に記載のバックライトユニット(26)。 - 液晶表示装置(1,20)に用いられ、光源(6)の上方に配置され、該光源(6)から出射された光を透過させる透光板(12)であって、
前記光源(6)の上方の位置に形成され、前記透光板(12)の前記光が出射される側とは反対側に向いた受光面を有する光電変換部(3)を備えた、透光板(12)。 - 前記液晶表示装置(20)は、前記光源(6)からの光が入射される複数の導光体(15)を備え、
少なくとも1つの前記光電変換部(3)が、平面的に見て、隣接する前記導光体(15)同士の境界を覆うように配置された、請求の範囲第14項に記載の透光板(12)。 - 前記液晶表示装置(20)は、前記光源(6)からの光が入射される複数の導光体(15)を備え、
前記光源(6)は、前記導光体(15)の互いに対向する2つの端部に沿って配置され、
複数の前記光源(6)は、異なる色の光を発光するものを1つ以上含み、
前記光源(6)の配列方向における各前記導光体(15)の端部の側面には、前記導光体(15)の内側に向いた受光面を有する光電変換部(24)が設けられた、請求の範囲第14項に記載の透光板(12)。 - 液晶表示装置(20)に用いられ、異なる色の光を発光するものを1つ以上含む複数の光源(6)からの光が入射される導光体(15)であって、
前記導光体(15)の互いに対向する2つの端部に沿って前記光源(6)が配置され、
前記光源(6)の配列方向における各前記導光体(15)の端部の側面には、前記導光体(15)の内側に向いた受光面を有する光電変換部(24)が設けられた、導光体(15)。
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JPH03165579A (ja) * | 1989-11-24 | 1991-07-17 | Sanyo Electric Co Ltd | 光起電力装置およびそれを用いた発光パネル |
JP2004102677A (ja) * | 2002-09-10 | 2004-04-02 | Alps Electric Co Ltd | タブレット及び表示装置 |
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