WO2011074374A1 - 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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- WO2011074374A1 WO2011074374A1 PCT/JP2010/070686 JP2010070686W WO2011074374A1 WO 2011074374 A1 WO2011074374 A1 WO 2011074374A1 JP 2010070686 W JP2010070686 W JP 2010070686W WO 2011074374 A1 WO2011074374 A1 WO 2011074374A1
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- light
- photoelectric conversion
- liquid crystal
- crystal display
- display device
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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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
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- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
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- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
- G02F1/13324—Circuits comprising solar cells
Definitions
- the present invention relates to a liquid crystal display device, a backlight unit, a translucent plate, and a light guide.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2007-212851 is a prior art document that discloses a liquid crystal display device that effectively uses light from a backlight to save power.
- 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.
- Patent Document 2 Patent Document 2
- the light transmittance in a region close to the light source is reduced by arranging high-density diffusion particles as a light-shielding portion in the region near the light source.
- the luminance uniformity of the light emitted from the diffusion plate is improved.
- the present invention has been made in view of the above-described problems, and can improve the luminance uniformity of a lighting device and achieve power saving, and can achieve a power saving, a liquid crystal display device, a backlight unit, a light transmitting plate, and a light guide plate.
- An object is to provide a light body.
- a liquid crystal display device is a liquid crystal display device including a plurality of photoelectric conversion units that generate electric power using external light received from a display surface.
- 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 opposite to the display surface, and provided with a plurality of light sources, and the light emitting layer and liquid crystal display panel The 1st photoelectric converting layer arrange
- the first photoelectric conversion layer includes a plurality of first photoelectric conversion units having a light receiving surface facing the display surface, which is formed at a position above the light source.
- the first photoelectric conversion unit by providing the first photoelectric conversion unit at a position above the light source that is likely to generate luminance unevenness, by suppressing light with high luminance from being emitted as it is to the liquid crystal display panel,
- the luminance uniformity of the lighting device can be improved by making the luminance of light incident on the liquid crystal display panel from the light emitting layer uniform. Since the light receiving surface of the first photoelectric conversion unit is formed on the display surface side, external light can be received to generate electric power, and power saving of the liquid crystal display device can be achieved.
- the lower surface of the first photoelectric conversion unit has light shielding properties. By doing so, it is possible to block light with high luminance generated at a position above the light source and make the luminance of light incident on the liquid crystal display panel from the light emitting layer uniform.
- the lower surface of the first photoelectric conversion unit reflects light and thus has a light shielding property.
- the first photoelectric conversion unit is a transmissive solar cell.
- the transmissive solar cell is a solar cell in which the photoelectric conversion unit is composed of mesh-like cells and light can pass through the gaps between the cells. By doing so, a part of the high-luminance light generated at a position above the light source is transmitted through the gap between the cells, and the luminance of the light incident on the liquid crystal display panel from the light emitting layer is made uniform. be able to.
- a second photoelectric conversion layer is provided below the light emitting layer.
- the second photoelectric conversion layer includes a plurality of second photoelectric conversion units having a light receiving surface facing the display surface.
- the first photoelectric conversion unit and the second photoelectric conversion unit are arranged such that the entire display surface is covered with the orthographic projection region on the display surface of the first photoelectric conversion unit and the orthographic projection region on the display surface of the second photoelectric conversion unit.
- a photoelectric conversion unit is formed.
- the first photoelectric conversion unit and the second photoelectric conversion unit are formed so that the orthographic projection region on the display surface of the first photoelectric conversion unit and the orthographic projection region on the display surface of the second photoelectric conversion unit do not overlap.
- the electric power generation amount per unit area of a photoelectric conversion part can be increased.
- the second photoelectric conversion unit is a transmissive solar cell, and a member that diffuses light or reflects light is provided below the second photoelectric conversion unit.
- the light transmitted through the second photoelectric conversion unit can be diffused or reflected and returned to the liquid crystal display panel side, so that the light use efficiency is increased and the power consumption of the liquid crystal display device is reduced. be able to.
- the first 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 light emitting layer includes a plurality of light guides into which light from a light source is incident, and at least one first photoelectric conversion unit is adjacent to each other in a plan view. It is arranged so as to cover the boundary. 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.
- At least one second photoelectric conversion unit is formed on the lower surface of the light guide.
- power generated by the first photoelectric conversion unit and the second 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 first photoelectric conversion layer includes a third photoelectric conversion unit that is formed below the first photoelectric conversion unit and has a light receiving surface facing away from the display surface.
- the first photoelectric conversion unit is provided at a position above the light source that is likely to generate luminance unevenness, and the light with high luminance is prevented from being emitted as it is to the liquid crystal display panel.
- the luminance uniformity of the illumination device can be improved by making the luminance of the light incident on the liquid crystal display panel uniform. Since the light receiving surface of the first photoelectric conversion unit is formed on the display surface side, external light can be received to generate electric power, and power saving of the liquid crystal display device can be achieved.
- 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 36, and a translucent plate 18.
- the liquid crystal display panel 2 constitutes the display surface 35 of the liquid crystal display device 1.
- the liquid crystal display device 1 receives external light from the display surface 35 positioned above in FIG.
- a backlight unit 36 is disposed below the liquid crystal display panel 2 on the side opposite to the display surface 35 side.
- the backlight unit 36 includes a light emitting layer 5 provided with a plurality of light sources 13, a first photoelectric conversion layer 28 disposed above the light emitting layer 5, and the like.
- a plurality of light sources 13 are arranged in an air layer 14 in which air is sealed in a flat substrate 12.
- the light emitting layer 5 is composed of the light source 13 and the air layer 14.
- a lighting device having a wide color reproduction range can be obtained.
- the light incident on the air layer 14 from the light source 13 travels while being mixed in the air layer 14 and reaches the boundary with the first photoelectric conversion layer 28.
- a translucent plate 18 is disposed above the light emitting layer 5 where a plurality of light sources 13 are scattered.
- a glass substrate is used as the light transmitting plate 18.
- a first photoelectric conversion unit 3 having a light receiving surface facing the display surface 35 side of the liquid crystal display device 1 is formed on the translucent plate 18 above the position where the light source 13 is disposed.
- the first photoelectric conversion unit 3 has a configuration in which a transparent conductive film 17 made of SnO 2 (tin oxide), a solar cell body 16, and a back electrode layer 15 in which a ZnO (zinc oxide) layer and an Ag layer are stacked are sequentially stacked. It is a thin film solar cell.
- the back electrode layer 15 By forming the back electrode layer 15 as described above, the lower surface 20 of the first photoelectric conversion unit 3 has a light shielding property because it reflects light. The light reflected by the lower surface 20 of the first photoelectric conversion unit 3 is returned to the light emitting layer 5. As a result, the light utilization efficiency is improved, so that the energy efficiency of the liquid crystal display device 1 can be improved.
- the solar cell main body 16 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 16 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.
- the technology of the silicon thin film necessary for manufacturing the liquid crystal display panel 2 can be horizontally developed in the first photoelectric conversion unit 3.
- the liquid crystal display device 1 having the above can be efficiently produced.
- the first photoelectric conversion unit 3 is formed at a position above each light source 13, and a space 21 is formed above the position between the light sources 13.
- air is sealed in the space 21, but a light amount adjustment unit 41 that diffuses light emitted from the light emitting layer 5 may be provided in the space 21. Since the light amount adjusting unit 41 has the same function as the diffusion plate 19, when the light amount adjusting unit 41 is provided in the space 21, the luminance uniformity of light emitted from the backlight unit 36 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. In this way, the amount of light incident on the liquid crystal display panel 2 can be adjusted by the light amount adjusting unit 41.
- a diffusion plate 19 is disposed above the translucent plate 18.
- the diffusing plate 19 diffuses the light emitted from the light source 13 inside the plate and emits light from the entire main surface of the plate.
- the diffusion plate 19 can be formed using a transparent resin such as an acrylic resin, polycarbonate, or polystyrene, but is not limited thereto, and a material generally used as a diffusion plate can be used.
- the second photoelectric conversion unit 4 has a configuration in which a transparent conductive film 9 made of SnO 2 (tin oxide), a solar cell body 8, and a back electrode layer 7 in which a ZnO (zinc oxide) layer and an Ag layer are stacked are sequentially stacked. It is a thin film solar cell.
- the solar cell body 8 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 8 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 8 since the technique of the silicon thin film required when manufacturing the liquid crystal display panel 2 can be developed horizontally on the second photoelectric conversion unit 4, the second photoelectric conversion unit 4
- the liquid crystal display device 30 having the above can be efficiently produced.
- the second photoelectric conversion unit 4 is formed to have a light receiving surface facing the display surface 35 side of the liquid crystal display device 1 below the position between the light sources 13. Specifically, the second photoelectric conversion unit 4 is formed below each of the positions between the light sources 13 that emit light so as to face each other.
- the second photoelectric conversion unit 4 is formed in addition to the position where the light source 13 is formed, and the first photoelectric conversion unit 3 is formed at the position where the light source 13 is formed.
- a region obtained by combining the orthographic projection region on the display surface of the first photoelectric conversion unit 3 and the orthographic projection region on the display surface 35 of the second photoelectric conversion unit 4 spreads so as to overlap the entire display surface 35. Yes. Further, the orthographic projection area on the display surface 35 of the first photoelectric conversion unit 3 and the orthographic projection area on the display surface 35 of the second photoelectric conversion unit 4 do not overlap.
- the first and second photoelectric conversion units do not overlap the entire area of the display surface 35 of the liquid crystal display device 1 in plan view. Conversion parts 3 and 4 can be formed. As a result, external light incident from the display surface 35 of the liquid crystal display device 1 can be received by the first and second photoelectric conversion units 3 and 4 with little leakage. Since there is no useless photoelectric conversion unit, the power generation amount per unit area of the first and second photoelectric conversion units 3 and 4 can be increased.
- a reflection part that makes light transmitted through the second photoelectric conversion layer 29 incident on the second photoelectric conversion layer 29 again may be formed on the lower surface of the second photoelectric conversion layer 29.
- the power generation amount of the second photoelectric conversion unit 4 can be increased, so that power saving of the liquid crystal display device 1 can be improved.
- the reflecting portion can be formed, for example, by depositing a metal such as Al on the lower surface of the substrate 6.
- the light emission direction from the light source 13 will be described.
- the backlight unit 36 unlike the conventional direct type backlight, there is no main component of the light emitting direction of the light source 13 in the direction perpendicular to the diffusion plate 19, in other words, no peak component of the emitted light. .
- the direction parallel to the diffusing plate 19 there is a main component of the light emitting direction of the light source 13.
- the light source 13 has directivity in the light emitting direction, and the directivity of the light component parallel to the light emitting layer 5 is larger than the component in the direction perpendicular to the light emitting layer 5.
- the emission direction of the light emitted from the light source 13 is indicated by an arrow. As indicated by the arrows, the light from each light source 13 is emitted along the light emitting layer 5. That is, light is emitted from the side surface of the light source 13 provided on the substrate 12, and the emission direction thereof is substantially parallel to the extending direction of the diffusion plate 19.
- the light emission direction from the light source 13 provided adjacent to each other is directed in the opposite direction.
- the luminance of light in the region immediately above the light source 13 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 13 are different from each other, the light can be spread to every corner of the light emitting layer 5. Therefore, the luminance uniformity of the light emitted from the backlight unit 36 can be improved.
- the main emission direction of light from the light source 13 is completely parallel to the boundary surface between the light emitting layer 5 and the first photoelectric conversion layer 28, but this is not necessarily the case. It is not limited to a simple configuration. That is, the light source 13 has directivity, and the directivity is based on the light component in the direction perpendicular to the boundary surface between the light emitting layer 5 and the first photoelectric conversion layer 28, and the light emitting layer 5 and the first photoelectric conversion. It is sufficient if the light component in the direction parallel to the boundary surface with the layer 28 is larger.
- the light is emitted from the light emitting layer 5.
- the brightness of the light can be made uniform.
- a light emitting diode is used as the light source 13. 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 13, the power consumption of the backlight unit 36 can be reduced and the life of the light source 13 can be extended.
- the electric power generated by the first photoelectric conversion unit 3 and the second photoelectric conversion unit 4 was stored in a power storage device (not shown) and used for driving the light source 13. In this way, by using the electromotive force obtained by the first and second photoelectric conversion units 3 and 4 as the light source 13, it is possible to save power in the liquid crystal display device 1.
- the electromotive force obtained by the first and second photoelectric conversion units 3 and 4 may be used for driving a device mounted on the liquid crystal display device 1.
- the first photoelectric conversion unit 3 may be configured by a transmissive solar cell.
- the transmissive solar cell is a solar cell in which the photoelectric conversion unit is composed of mesh-like cells and light can pass through the gaps between the cells. In this way, a part of the high-luminance light generated at a position above the light source 13 is transmitted through the gap between the cells, and the luminance of the light incident on the liquid crystal display panel 2 from the light emitting layer 5 is increased. It can be made uniform.
- the second photoelectric conversion unit 4 may be configured by a transmissive solar cell, and a member that diffuses light may be provided below the second photoelectric conversion unit 4. .
- a member that diffuses light is provided below the second photoelectric conversion unit 4, but a member that reflects light may be provided below the second photoelectric conversion unit 4. . Even in this case, since the light transmitted through the second photoelectric conversion unit 4 can be reflected and returned to the liquid crystal display panel 2 side, the light use efficiency is improved and the power consumption of the liquid crystal display device 1 is reduced. Can be achieved.
- the first photoelectric conversion unit 3 having the light-shielding surface on the lower surface is provided above the light source 13 where luminance unevenness is likely to occur, the light emitting layer 5 to the liquid crystal display panel 2. Accordingly, the luminance of the backlight unit 36 can be improved. Since the light receiving surface of the first photoelectric conversion unit 3 is formed so as to face the display surface 35 side, external light can be received and power can be generated, and power saving of the liquid crystal display device 1 can be achieved.
- the 2nd photoelectric conversion part 4 since the effect of this invention can be acquired by providing the 1st photoelectric conversion part 3, the 2nd photoelectric conversion part 4 is not necessarily required. It does not have to be provided.
- 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 38 includes a plurality of light guides 22 into which light from the light source 13 is incident.
- the upper surface of the light guide 22 and the lower surface of the first photoelectric conversion layer 28 are in contact with each other.
- the first photoelectric conversion unit 3 is disposed so as to cover the boundary between the light guides 22 when viewed in plan. In the present embodiment, all the first photoelectric conversion units 3 are formed so as to cover the boundary between the light guides 22, but at least one first photoelectric conversion unit 3 is formed between the light guides 22. What is necessary is just to be formed so that a boundary may be covered.
- the light incident on the light guide 22 from the light source 13 proceeds to the boundary with the first photoelectric conversion layer 28 while repeating total reflection in the light guide 22.
- the light intensity decreases. Therefore, the intensity of light totally reflected a plurality of times in the light guide 22 is reduced.
- the light guide 22 having a tile structure a part of the light incident on the light guide 22 from the light source 13 is not totally reflected in the light guide 22 and is adjacent to the light guide 22.
- the boundary between the light guides 22 to be reached is reached. Since a part of the light 23 is not totally reflected in the light guide 22, the light intensity is high. Therefore, the light emitted from the gap between the adjacent light guides 22 includes strong light, and the light emitted from the backlight unit 36 when the light is directly incident on the liquid crystal display panel 2.
- the luminance uniformity is impaired.
- the first photoelectric conversion unit 3 is disposed so as to cover the boundary between the light guides 22 in plan view, and the lower surface of the first photoelectric conversion unit 3 is light-shielding. have. Therefore, since the high brightness light emitted from the gap between the light guides 22 is shielded by the first photoelectric conversion unit 3, the brightness uniformity of the light incident on the liquid crystal display panel 2 is improved. Can do.
- the second photoelectric conversion unit 4 is formed on the lower surface of the light guide 22. Specifically, the second photoelectric conversion unit 4 is disposed at the boundary position between the substrate 12 and the light guide 22. On the lower surface of the light guide 22, a second photoelectric conversion unit 4 having a light receiving surface facing the upper surface of the light guide 22 is provided at a position between the light sources 13 that irradiate light so as to face each other. Yes.
- the second photoelectric conversion unit 4 is formed at a position other than the position where the light source 13 is formed in a plan view, and the first photoelectric conversion unit 3 is formed at the position where the light source 13 is formed. ing.
- a region obtained by combining the orthographic projection region on the display surface 35 of the first photoelectric conversion unit 3 and the orthographic projection region on the display surface 35 of the second photoelectric conversion unit 4 spreads so as to overlap the entire display surface 35.
- the orthographic projection area on the display surface 35 of the first photoelectric conversion unit 3 and the orthographic projection area on the display surface 35 of the second photoelectric conversion unit 4 do not overlap.
- the first and second photoelectric conversion units do not overlap the entire area of the display surface 35 of the liquid crystal display device 1 in plan view. Conversion parts 3 and 4 can be formed. As a result, external light incident from the display surface 35 of the liquid crystal display device 1 can be received by the first and second photoelectric conversion units 3 and 4 with little leakage. Moreover, since there is no useless photoelectric conversion unit, the power generation amount per unit area of the first and second photoelectric conversion units 3 and 4 can be increased.
- the first photoelectric conversion unit 3 whose lower surface is light-shielding is provided at a position above the light source 13 where luminance unevenness easily occurs. Accordingly, the luminance of the backlight unit 36 can be improved. Since the light receiving surfaces of the first photoelectric conversion unit 3 and the second photoelectric conversion unit 4 are formed so as to face the display surface 35 side, external light can be received and power can be generated, and power saving of the liquid crystal display device 30 can be achieved. 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 cross-sectional view schematically showing a configuration of a liquid crystal display device according to Embodiment 3 of the present invention.
- FIG. 3 in the liquid crystal display device 40 according to the present embodiment, below the first photoelectric conversion unit 3 of the first photoelectric conversion layer 37, on the side opposite to the display surface 35 side of the liquid crystal display device 40.
- a third photoelectric conversion unit 34 having a light receiving surface facing is provided.
- the third photoelectric conversion unit 34 has a configuration in which a transparent conductive film 31 made of SnO 2 (tin oxide), a solar cell main body 32, and a back electrode layer 33 in which a ZnO (zinc oxide) layer and an Ag layer are stacked are sequentially stacked. It is a thin film solar cell.
- the solar cell main body 32 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 32 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.
- the technology of the silicon thin film necessary for manufacturing the liquid crystal display panel 2 can be horizontally developed in the third photoelectric conversion unit 34. Therefore, the third photoelectric conversion unit 34
- the liquid crystal display device 40 having the above can be efficiently produced.
- a third photoelectric conversion unit 34 is formed at a position above each light source 13, and a space 21 is formed above the position between the light sources 13.
- air is sealed in the space 21, but a light amount adjusting unit 41 that diffuses light emitted from the light emitting layer 38 may be provided in the space 21. Since the light amount adjustment unit 41 has the same function as the diffusion plate 19, when the light amount adjustment unit 41 is provided in the space 21, the luminance uniformity of light emitted from the backlight unit 39 is improved. be able to.
- the third photoelectric conversion unit 34 is arranged so as to cover the boundary between the adjacent light guides 22 in a plan view, the light with high luminance emitted from the gap between the light guides 22 is used. Since 23 is collected by the third photoelectric conversion unit 34, the luminance uniformity of the light incident on the liquid crystal display panel 2 can be improved. Moreover, the power saving of the liquid crystal display device 40 can be improved by using the electromotive force generated by collecting light with high luminance as the light source 13. Since other configurations are the same as those of the second embodiment, description thereof will not be repeated.
- Liquid crystal display device 2 Liquid crystal display panel, 3rd first photoelectric conversion part, 28, 37 1st photoelectric conversion layer, 4th 2nd photoelectric conversion part, 29 2nd photoelectric conversion layer, 5,38 light emitting layer 6, 12, substrate, 7, 15, 33, back electrode layer, 8, 16, 32 solar cell body, 9, 17, 31 transparent conductive film, 13 light source, 14 air layer, 18 translucent plate, 19 diffuser plate, 20 Lower surface, 21 space, 22 light guide, 23 light, 34 third photoelectric conversion unit, 35 display surface, 36, 39 backlight unit, 41 light quantity adjustment unit.
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Abstract
Description
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36および透光板18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30においては、発光層38が、光源13からの光が入射される複数の導光体22を備えている。
図3は、本発明の実施形態3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3に示すように、本実施形態に係る液晶表示装置40においては、第1光電変換層37の第1光電変換部3の下方に、液晶表示装置40の表示面35側とは反対側に向いた受光面を有する第3光電変換部34が設けられている。
Claims (21)
- 表示面(35)から受光した外光を利用して発電する複数の光電変換部を備える液晶表示装置(1,30,40)であって、
前記表示面(35)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(35)側とは反対側である下方に配置され、複数の光源(13)が設けられた発光層(5,38)と、
前記発光層(5,38)と前記液晶表示パネル(2)との間に配置された第1光電変換層(28,37)と
を備え、
前記第1光電変換層(28,37)は、前記光源(13)の上方の位置に形成された、前記表示面(35)側に向いた受光面を有する複数の第1光電変換部(3)を含む、液晶表示装置(1,30,40)。 - 前記第1光電変換部(3)の下面(20)が遮光性を有する、請求の範囲第1項に記載の液晶表示装置(1,30)。
- 前記第1光電変換部(3)の下面(20)が光を反射することにより前記遮光性を有する、請求の範囲第2項に記載の液晶表示装置(1,30)。
- 前記第1光電変換部(3)が透過型太陽電池である、請求の範囲第1項に記載の液晶表示装置(1,30)。
- 前記発光層(5,38)の下方に配置された第2光電変換層(29)を備え、
前記第2光電変換層(29)は、前記表示面(35)側に向いた受光面を有する複数の第2光電変換部(4)を含む、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(1,30,40)。 - 前記第1光電変換部(3)の前記表示面(35)への正投影領域と前記第2光電変換部(4)の前記表示面(35)への正投影領域とを合わせた領域が前記表示面(35)の全体と重なるように、前記第1光電変換部(3)および前記第2光電変換部(4)が形成されている、請求の範囲第5項に記載の液晶表示装置(1,30,40)。
- 前記第1光電変換部(3)の前記表示面(35)への正投影領域と前記第2光電変換部(4)の前記表示面(35)への正投影領域とが重ならないように、前記第1光電変換部(3)および前記第2光電変換部(4)が形成されている、請求の範囲第6項に記載の液晶表示装置(1,30,40)。
- 前記第2光電変換部(4)が透過型太陽電池であり、
前記第2光電変換部(4)の下方に、光を拡散するまたは光を反射する部材が設けられた、請求の範囲第5項から第7項のいずれかに記載の液晶表示装置(1,30,40)。 - 前記第1光電変換層(28,37)は、前記発光層(5,38)から発光された光を拡散させる光量調節部(41)を含む、請求の範囲第1項から第8項のいずれかに記載の液晶表示装置(1,30,40)。
- 前記光源(13)は、その発光方向に指向性を有し、該指向性は、前記発光層(5,38)に垂直な方向の光の成分よりも前記発光層(5,38)に平行な光の成分の方が大きい、請求の範囲第1項から第9項のいずれかに記載の液晶表示装置(1,30,40)。
- 前記光源(13)が発光ダイオードである、請求の範囲第10項に記載の液晶表示装置(1,30,40)。
- 前記発光層(38)は、前記光源(13)からの光が入射される複数の導光体(22)を備え、
少なくとも1つの前記第1光電変換部(3)が、平面的に見て、隣接する前記導光体(22)同士の境界を覆うように配置された、請求の範囲第10項に記載の液晶表示装置(30,40)。 - 少なくとも1つの前記第2光電変換部(4)が、前記導光体(22)の下面に形成された、請求の範囲第12項に記載の液晶表示装置。
- 前記第1光電変換部(3)および前記第2光電変換部(4)により発電された電力を前記光源(13)に利用する、請求の範囲第5項に記載の液晶表示装置(1,30,40)。
- 前記第1光電変換部(3)および前記第2光電変換部(4)の少なくとも一方は、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5項に記載の液晶表示装置(1,30,40)。
- 前記第1光電変換層(37)が、前記第1光電変換部(3)の下方に形成された、前記表示面(35)側とは反対側に向いた受光面を有する第3光電変換部(34)を含む、請求の範囲第1項から第15項のいずれかに記載の液晶表示装置(40)。
- 光を出射する出射面から受光した外光を利用して発電する複数の光電変換部を備えるバックライトユニット(36,39)であって、
複数の光源(13)が設けられた発光層(5,38)と、
前記発光層(5,38)の上方に配置された第1光電変換層(28,37)と
を備え、
前記第1光電変換層(28,37)は、前記光源(13)の上方の位置に形成された、前記出射面側に向いた受光面を有する複数の第1光電変換部(3)を含む、バックライトユニット(36,39)。 - 前記発光層(38)は、前記光源(13)からの光が入射される複数の導光体(22)を備え、
少なくとも1つの前記第1光電変換部(3)が、平面的に見て、隣接する前記導光体(22)同士の境界を覆うように配置された、請求の範囲第17項に記載のバックライトユニット(36,39)。 - 液晶表示装置(1,30,40)に用いられ、光源(13)の上方に配置され、該光源(13)から出射された光を透過させる透光板(18)であって、
前記光源(13)の上方の位置に形成され、前記透光板(18)の前記光が出射される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(18)。 - 前記液晶表示装置(30,40)は、前記光源(13)からの光が入射される複数の導光体(22)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(22)同士の境界を覆うように配置された、請求の範囲第19項に記載の透光板(18)。 - 液晶表示装置(30,40)に用いられ、複数の光源(13)からの光が入射される導光体(22)であって、
前記導光体(22)の下面において前記光源(13)同士の間の位置に形成され、前記導光体(22)の上面側に向いた受光面を有する光電変換部(4)を備えた、導光体(22)。
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CN110895374A (zh) * | 2019-11-26 | 2020-03-20 | 上海天马微电子有限公司 | 显示面板及显示装置 |
CN110928002A (zh) * | 2019-11-29 | 2020-03-27 | 上海天马微电子有限公司 | 显示模组及显示装置 |
EP3767380A1 (en) * | 2019-07-19 | 2021-01-20 | HighVisTec GmbH | Optically and electrically addressable liquid crystal device |
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KR101813109B1 (ko) * | 2016-12-08 | 2017-12-29 | (주)주연테크 | 모니터 대기전력 공급장치 |
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