JP2010101912A - Liquid crystal device - Google Patents

Liquid crystal device Download PDF

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Publication number
JP2010101912A
JP2010101912A JP2007026719A JP2007026719A JP2010101912A JP 2010101912 A JP2010101912 A JP 2010101912A JP 2007026719 A JP2007026719 A JP 2007026719A JP 2007026719 A JP2007026719 A JP 2007026719A JP 2010101912 A JP2010101912 A JP 2010101912A
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JP
Japan
Prior art keywords
light
liquid crystal
guide plate
crystal display
light guide
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Pending
Application number
JP2007026719A
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Japanese (ja)
Inventor
Tatsuo Ito
Takayuki Nagata
Kazuhisa Yamamoto
達男 伊藤
和久 山本
貴之 永田
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Panasonic Corp
パナソニック株式会社
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Priority to JP2007026719A priority Critical patent/JP2010101912A/en
Publication of JP2010101912A publication Critical patent/JP2010101912A/en
Application status is Pending legal-status Critical

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means 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
    • G02B6/004Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means 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
    • G02B6/0038Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides 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
    • G02B6/0068Arrangements of plural sources, e.g. multi-colour light sources
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133621Illuminating devices providing coloured light
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023Means 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means 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
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means 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
    • G02B6/0045Means 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 by shaping at least a portion of the light guide
    • G02B6/0046Tapered light guide, e.g. wedge-shaped light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F2001/133607Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133621Illuminating devices providing coloured light
    • G02F2001/133623Inclined coloured light beams

Abstract

A low power consumption liquid crystal display device with high brightness and thinness and high light use efficiency is provided.
A liquid crystal display device includes a liquid crystal display panel and a lens array provided corresponding to the arrangement of RGB pixels including R, G, and B pixels of the liquid crystal display panel. And a planar illumination device 15 that is incident on each lens 34 of the lens array 26 at a different angle of incidence for each color. The planar illumination device 15 emits R, G, B light 12, 13, and 14 from a laser light source and R, G, B light 12, 13, and 14 from one main surface 23 at different emission angles. A light guide plate 24 is included. The R, G, and B lights 12, 13, and 14 emitted from the light guide plate 24 are condensed by the lens 34, and the light amounts of the R, G, and B lights 12, 13, and 14 are respectively applied to the corresponding pixels. Increases and enters.
[Selection] Figure 1

Description

  The present invention relates to a high-brightness liquid crystal display device using laser light as a light source.

  In recent years, liquid crystal display devices using light emitting diodes (LEDs) as light sources have been vigorously developed and put into practical use as liquid crystal display devices with a wide color reproduction range. In addition, liquid crystal display devices that use laser light as a high-intensity light source are also being researched and developed as high-brightness liquid crystal display devices with a wide color reproduction range, taking advantage of the monochromaticity and high luminance of laser light. Collecting. However, a liquid crystal display device having such excellent features is required to be thinner, more efficient, lower power consumption, and is required to be mass-productive.

  In a conventional liquid crystal display device, there is a loss due to a color filter as one of the main factors hindering high efficiency and low power consumption. Usually, a color filter that transmits only one color of light corresponding to each pixel of RGB is arranged in a pixel composed of three primary colors of red (R), green (G), and blue (B). Light that does not correspond to each pixel is eliminated by the color filter and lost.

  Conventionally, various studies have been made on this problem. For example, a method has been proposed in which RGB light is separated and incident on each pixel using a micro Fresnel lens (see Patent Document 1).

  In this method, three laser beams composed of a red laser beam (R beam), a green laser beam (G beam), and a blue laser beam (B beam) are combined into one laser beam by an optical coupler to form RGB light, The RGB light is scanned with a polygon mirror and a flat reflection mirror and is incident on a micro Fresnel lens array. After being separated into R light, G light, and B light according to the spectral characteristics of the micro Fresnel lens, each RGB light corresponding to the liquid crystal panel is displayed. It is assumed that the pixels are irradiated directly.

  By using a liquid crystal panel constructed without using a color filter in this way for a liquid crystal display device, color display using RGB light can be performed efficiently.

  As another method that does not require a color filter, R, G, and B lights are emitted vertically from different positions on the main surface of the light guide plate corresponding to the positions of the RGB pixels of the liquid crystal display panel. For this reason, a method of making the light incident only on the corresponding pixel has been proposed (see Patent Document 2).

  In this method, each of R, G, and B light emitted from the LED light source is incident from different edges of the light guide plate, and R, G, and R from different positions on the main surface of the light guide plate by the rising mirror corresponding to the incident direction. Each light of B is selectively emitted to the outside of the light guide plate and directly irradiated to each corresponding RGB pixel of the liquid crystal panel.

  Furthermore, as another method that does not require a color filter, a configuration using an LED light source array and two types of lens arrays has been proposed (see Patent Document 3).

In this method, R, G, and B light from a two-dimensional LED light source array is collimated with a condenser lens array, and the corresponding RGB pixels of the liquid crystal panel are directly irradiated with the microlens array.
JP-A-6-148635 JP 2003-35904 A JP-A-11-231316

  However, in these patent documents, each light of R, G, and B has a spatially limited spread, and the light of R, G, and B is applied to the corresponding color pixel in consideration of the spread of the light. Only the method of completely separate introduction is not specified. Further, in these image display devices, it is difficult to completely separate only R, G, and B light into corresponding color pixels. For example, when display is performed without a color filter, R, G, and It is considered that a clear image cannot be obtained because the light of B overlaps.

  Further, a light guide plate or lens for introducing R, G, and B light corresponding to the sizes of red pixels (R pixels), green pixels (G pixels), and blue pixels (B pixels) that are becoming finer pitches. The specific configuration of the optical system is not sufficiently shown.

  That is, in the method disclosed in Patent Document 1, the B light leaks not only to the B pixel but also to the G pixel, and the G light and the R light have a large amount of light leaking to pixels other than the corresponding pixel due to the configuration of the optical system. The problem of becoming. Therefore, a clear image cannot be obtained when the color filter is excluded, and even if the color filter is used, light leaking into pixels other than the corresponding pixel is excluded by the color filter and is lost. Further, such a liquid crystal display device has a problem that the scanning optical system is large and the device cannot be thinned.

  Further, in Patent Document 2, in consideration of the spread of light inside the light guide plate, which is a light guide, most of the light reflected by the light guide plate raised portion (rise mirror portion) corresponding to each pixel corresponds to each pixel. An optical configuration in which collimation is performed by a lens on the exit surface is difficult, and a specific optical configuration in consideration of the pixel size is not specified. If there is no lens on the exit surface, there is a problem that it is more difficult to separate and enter R, G, and B light corresponding to each pixel.

  Further, when the configuration according to Patent Document 3 is used as backlight illumination of a liquid crystal display device, there is a problem that it is difficult to reduce the thickness because a certain distance is required from the LED light source array to the condenser lens array. This distance can be shortened by increasing the number of LED elements and condenser lenses. However, increasing the number of LED elements causes cost and variations.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide a liquid crystal display device with high brightness and thinness, high light use efficiency, and low power consumption.

  In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal display panel, and a lens array provided corresponding to the arrangement of pixels composed of red pixels, green pixels, and blue pixels of the liquid crystal display panel. A planar illumination device that emits at least red, green, and blue laser light from one main surface and enters the lens array with a constant incidence angle that is different for each color. The planar illumination device has a laser light source that emits at least red, green, and blue laser beams, and the red, green, and blue laser beams that are incident from the side surfaces and have different emission angles from the one main surface. The red, green and blue laser beams are emitted from the one main surface of the light guide plate at different emission angles, respectively. Focused in different directions by the lens consists configured to respectively enter the red pixel, green pixel and blue pixel.

  With such a configuration, after the R light, the G light, and the B light are emitted from the entire main surface at different emission angles, the red pixel (R pixel), the green pixel (G pixel), and the blue pixel (B pixel) ) Is focused on the RGB pixels of the liquid crystal display panel by the lens array arranged corresponding to the pixels (RGB pixels), so that a liquid crystal display device with high brightness and thinness and high light utilization efficiency can be obtained. realizable. In addition, since laser light is used with high efficiency, a liquid crystal display device with low power consumption can be further realized.

  Further, the light guide plate is configured to include a prism sheet made of a material with high refractive index wavelength dispersion disposed on the main surface, and a plurality of rising mirrors are formed on the opposing surface facing the main surface, and red, The green and blue laser lights may be incident from the same side surface of the light guide plate, guided to the prism sheet by the rising mirror on the opposite surface, and emitted from the main surface with different emission angles.

  With such a configuration, after the R light, G light, and B light are incident on the light guide plate and then emitted from the entire main surface of the light guide plate at different emission angles, the lens array efficiently uses the liquid crystal display panel. Focused on RGB pixels. Therefore, a liquid crystal display device with high brightness, high light utilization efficiency and low power consumption can be realized by an optical system including such a light guide plate.

  The light guide plate is composed of a prism sheet made of a material having a high refractive index wavelength dispersion disposed on the main surface, and a light guide plate body formed of a resin material including a scatterer, and includes red, green, and blue lasers. The light may be incident from the same side surface of the light guide plate, guided to the prism sheet by the scatterer of the light guide plate body, and emitted from the main surface with different emission angles.

  By adopting such a configuration, it is possible to realize a further light and thin light guide plate and liquid crystal display device. In addition, since the light utilization efficiency is high, a liquid crystal display device with low power consumption can be realized by an optical system including such a light guide plate.

  The prism sheet may have a configuration in which stripe-like prisms are formed perpendicular to the directions in which red, green, and blue laser beams are incident.

  With such a configuration, the prism can be easily manufactured and the optical system of the liquid crystal display device can be simplified, so that a liquid crystal display device with higher mass productivity can be realized.

  The light guide plate has a wavelength-selective transmission diffraction pattern formed on the main surface, and red, green, and blue laser light is incident from the same side surface of the light guide plate and guided to the transmission diffraction pattern. It is good also as a structure which radiates | emits with a respectively different radiation | emission angle.

  The light guide plate is formed on a facing surface where the wavelength-selective reflective diffraction pattern is opposed to the inner main surface, and red, green, and blue laser beams are incident from the same side surface of the light guide plate and It is good also as a structure which radiate | emits with a different radiation | emission angle from a main surface with a reflection type diffraction pattern.

  With such a configuration, a thinner light guide plate and liquid crystal display device can be realized. Furthermore, a liquid crystal display device with high brightness, high light utilization efficiency and low power consumption can be realized by an optical system including such a light guide plate. In addition, since the light guide plate can be easily manufactured and the optical system of the liquid crystal display device can be simplified, a liquid crystal display device with higher mass productivity can be realized.

  Further, the opposing surface of the light guide plate may be configured such that the distance from the main surface decreases as the distance from the same side surface on which the red, green, and blue laser beams are incident is increased.

  With such a configuration, the light guide plate can be easily manufactured and the optical system of the liquid crystal display device can be simplified, so that a liquid crystal display device with higher mass productivity can be realized.

  In addition, the light guide plate has a plurality of polyhedral mirrors formed on the opposing surface facing the inner main surface, and the red, green, and blue laser beams are incident from three different side surfaces of the light guide plate, and are opposed to the polyhedral mirror. Thus, the light may be emitted from the main surface with different emission angles.

  By adopting such a configuration, after the R light, G light, and B light are incident on the light guide plate, they are emitted from the entire main surface of the light guide plate with different emission angles, and the liquid crystal is efficiently emitted by the lens array. The light is condensed on RGB pixels of the display panel. Therefore, a liquid crystal display device with high brightness, high light utilization efficiency and low power consumption can be realized by an optical system including such a light guide plate.

  Further, the blue laser light may be configured to be incident from the side surface on the long side of the light guide plate. By adopting such a configuration, it is possible to reduce the absorption of the blue laser light at the light guide plate and to realize a low power consumption liquid crystal display device with high light utilization efficiency.

  The polyhedral mirror may be configured to include at least three reflecting mirrors that reflect laser light incident from three different side surfaces of the light guide plate in the direction of the main surface.

  By adopting such a configuration, after the R light, G light, and B light are incident on the light guide plate, they are emitted from the entire main surface of the light guide plate with different emission angles, and the liquid crystal is efficiently emitted by the lens array. The light is condensed on RGB pixels of the display panel. Therefore, a liquid crystal display device with high brightness, high light utilization efficiency and low power consumption can be realized by an optical system including such a light guide plate.

  In addition, the lens array may be a sheet-like lens in which cylindrical lenses having a width corresponding to the width of a pixel composed of a red pixel, a green pixel, and a blue pixel of a liquid crystal display panel are arranged in a stripe shape.

  By adopting such a configuration, a lens array arranged corresponding to a pixel composed of a red pixel, a green pixel, and a blue pixel can be easily manufactured, and the optical system of the liquid crystal display device can be simplified. A liquid crystal display device with high mass productivity can be realized.

  Further, the lens array has a horizontal width corresponding to the horizontal width of the pixel composed of the red pixel, the green pixel and the blue pixel of the liquid crystal display panel and the vertical direction of the pixel composed of the red pixel, the green pixel and the blue pixel. A toric lens having a vertical width corresponding to the width may be a sheet-shaped lens in which a plurality of vertical and horizontal toric lenses are arranged.

  By adopting such a configuration, a lens array arranged corresponding to a pixel composed of a red pixel, a green pixel, and a blue pixel can be easily manufactured, and the optical system of the liquid crystal display device can be simplified. A liquid crystal display device with high mass productivity can be realized. In addition, laser light that reaches between a pair of adjacent RGB pixels without a lens can be focused on each color pixel of the RGB pixels by the lens array, so that the laser light can be made more efficient. Can be used.

  Further, the laser light is emitted or emitted from the liquid crystal display panel by diffusing or deflecting the laser light by a correction plate disposed adjacent to any outside of the glass plate sandwiching the RGB pixels of the liquid crystal display panel. It is good also as a structure which correct | amends.

  By adopting such a configuration, the RGB light that has reached the pixel composed of the red pixel, the green pixel, and the blue pixel is efficiently scattered, and the liquid crystal display device can display a uniform high luminance image without luminance unevenness. It can be carried out. That is, it is possible to improve the color characteristics of the viewing angle in which the color changes depending on the viewing angle of the liquid crystal display device.

  Further, the red, green, and blue laser lights may be configured to be incident from the side surface of the light guide plate by scanning the incident angle or the incident position.

  By adopting such a configuration, uniform R, G, and B light that is emitted from the main surface of the light guide plate at different emission angles can be obtained, and the light guide plate can be thinned. It can be made thin.

  The light guide plate may further include a laser light introducing portion on a side surface, and the laser light introducing portion may include an optical element that separates or spreads the laser light flux composed of red, green, and blue laser light.

  With such a configuration, even when the laser light is vertically incident on the side surface of the light guide plate, uniform R, G, and B light emitted from the main surface of the light guide plate at different emission angles can be obtained and guided. Since the optical plate can be made thinner, the liquid crystal display device can be made thinner and thinner.

  According to the liquid crystal display device of the present invention, high-intensity R light, G light, and B light are emitted from the entire main surface at different emission angles, respectively, and then a red pixel (R pixel), a green pixel (G pixel), and a blue color are emitted. Since it is condensed on the RGB pixels of the liquid crystal display panel by the lens array arranged corresponding to the pixels (RGB pixels) composed of the pixels (B pixels), it is high in luminance and thin and has high light use efficiency. A liquid crystal display device can be realized. In addition, since laser light is used with high efficiency, a liquid crystal display device with low power consumption can be further realized. Therefore, a great effect is achieved that a high-quality and thin liquid crystal display device having a large area with a wide color reproduction range can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and description may be abbreviate | omitted. In addition, the drawings schematically show each component mainly for easy understanding, and the shape and the like are not accurate.

(Embodiment 1)
1 to 9 show schematic views of a liquid crystal display device according to Embodiment 1 of the present invention. FIG. 1 schematically shows a schematic configuration diagram of a liquid crystal display device according to the present embodiment. 1A is an exploded perspective view of the liquid crystal display device of the present embodiment, FIG. 1B is a schematic configuration diagram of the front of the liquid crystal display device viewed from the liquid crystal display panel, and FIG. It is a schematic sectional drawing of the principal part seen from the cross section of the AA line of 1 (b).

  As shown in FIG. 1A, the liquid crystal display device 10 of the present embodiment includes a liquid crystal display panel 11, a red pixel (R pixel) 33R, a green pixel (G pixel) 33G, and a blue pixel of the liquid crystal display panel 11. The lens array 26 corresponding to the arrangement of the pixels (RGB pixels) 33 constituted by (B pixels) 33B and the respective lenses 34 of the lens array 26 are constant and have different incident angles for each color. A planar illumination device 15 for incidence is provided.

  The planar illumination device 15 includes a red laser light source (R light source) 19 that emits red laser light (R light) 12, a green laser light source (G light source) 20 that emits green laser light (G light) 13, and A blue laser light source (B light source) 21 that emits blue laser light (B light) 14, a dichroic mirror 27 that transmits G light but reflects B light, and transmits G light and B light but reflects R light. The dichroic mirror 28, the reflecting mirror 30, the light distribution unit 31, the R light 12, the G light 13, and the B light 14 are incident from the side surface 22 and emitted from the one main surface 23 with different emission angles. It is comprised from the light-guide plate 24 to do.

  Here, for example, as shown in FIG. 1B, the light distribution unit 31 distributes the RGB light 29 by arranging a large number of mirrors 32 arranged so that the reflectance increases in order as the distance from the reflection mirror 30 increases. The light guide plate 24 is configured to uniformly enter the entire side surface 22.

  An outline of the operation of the liquid crystal display device 10 thus configured will be described. The R light 12, G light 13 and B light 14 emitted from the R light source 19, G light source 20 and B light source 21 are combined into one RGB light 29 by the dichroic mirrors 27 and 28 with almost no loss of light quantity. The RGB light 29 is uniformly incident on the entire side surface 22 of the light guide plate 24 via the reflection mirror 30 and the light distribution unit 31.

  The R light 12, G light 13 and B light 14 incident on the light guide plate 24 are emitted from the one main surface 23 of the light guide plate 24 at different emission angles. The configuration and operation of the light guide plate 24 of the present embodiment will be described in detail later.

  At this time, when the position of the eye 35a is the direction in which the R light 12 is emitted from the main surface 23 of the light guide plate 24, the light guide plate 24 viewed from the eye 35a has a part of the R light 12 going straight to the eye 35a. Since it arrives, it looks like a red color of only the R light 36a. Further, when the position of the eye 35b is in the direction in which the B light 14 is emitted from the main surface 23 of the light guide plate 24, the light guide plate 24 viewed from the eye 35b similarly moves a part of the B light 14 straightly. Therefore, it appears as a blue color with only the B light 36b. When the eyes (not shown) are on the upper side of the liquid crystal display panel 11, when the light guide plate 24 is viewed with the liquid crystal display panel 11 and the lens array 26 removed, a part of the G light 13 goes straight. Since it reaches the eye (not shown), it appears as a green color with only G light (not shown).

  The R light 12, G light 13 and B light 14 emitted from the light guide plate 24 at different emission angles are collected by the lens 34 and enter the R pixel 33R, the G pixel 33G and the B pixel 33B.

  At this time, the amount of light incident on the corresponding pixel increases compared to the conventional configuration. The reason for this will be described below.

  FIG. 1C is a schematic cross-sectional view of the main part of the liquid crystal display device 10 as viewed from the cross section taken along the line AA in FIG. 1C, the liquid crystal display panel 11 includes an RGB pixel 33 and a liquid crystal 54 sandwiched between two glass plates 55 and 56, and is adjacent to the glass plate 55 on the side from which laser light is emitted. The diffusion plate 57 is arranged. Further, the diffusion plate 57 is arranged as a correction plate for correcting the emission characteristics of the laser light from the liquid crystal display panel 11 by diffusing or deflecting the laser light.

  In the thus configured liquid crystal display panel 11, the R light 12, the G light 13, and the B light 14 emitted from the main surface 23 of the light guide plate 24 at different emission angles are converted into RGB pixels of the liquid crystal panel 11 by the lens array 26. 33 is incident.

  In FIG. 1C, five RGB pixels 33 are shown, and the R light 12, the G light 13, and the B light 14 have different emission angles from the main surface 23 of the light guide plate 24 as indicated by the RGB pixels 33 at both ends. The light is emitted. Similarly, the R light 12, the G light 13, and the B light 14 are emitted from the main surface 23 of the light guide plate 24 at different emission angles in the three center RGB pixels 33. Here, in order to explain how the R light 12, the G light 13, and the B light 14 are guided to the RGB pixel 33, the R light 12, the G light 13, Only the B light 14 is shown. That is, most of the light amount of the R light 12 is emitted in a certain direction in the region from the R light 12a to the R light 12b, and is condensed by the cylindrical lens 34 corresponding to the RGB pixels 33 of the lens array 26 to be R light. The red pixel (R pixel) 33R of the liquid crystal panel 11 is collected in the region from 12c to the R light 12d. Similarly, most of the light amounts of the G light 13 and the B light 14 are emitted in a certain direction in the region from the R light 13a to the R light 13b and the region from the R light 13c to the R light 13d. Then, the light is condensed by the cylindrical lens 34 corresponding to the RGB pixel 33 of the lens array 26 and collected in the green pixel (G pixel) 33G and the blue pixel (B pixel) 33B of the liquid crystal panel 11.

  In this way, the R light 12, the G light 13 and the B light 14 are condensed and guided to the corresponding pixels, respectively, so that the R light 12, the G light 13 and the B light 14 enter the adjacent pixels and are lost. Can be reduced.

  The effect of this efficiency improvement will be specifically described with reference to FIG. 2A shows a case where the RGB light 29 is vertically incident on a liquid crystal display unit having a conventional configuration without the lens array 26. FIGS. 2B to 2D show the liquid crystal display unit and the surface according to the present embodiment. It is a schematic sectional drawing of the liquid crystal display part at the time of using an illuminating device (not shown).

  As shown in FIG. 2A, in the conventional configuration, the RGB light 29 is uniformly incident on the RGB pixels 33. The RGB light 29 incident on one RGB pixel 33 at this time is the light from the RGB light 29a to the RGB light 29b, and is incident on the R pixel 33R, the G pixel 33G, and the B pixel 33B and used as the R light. , G light and B light are 1/3 or less. At this time, when the aperture ratio of the pixel is 80%, usable R light, G light, and B light are about 24%.

  On the other hand, in the present embodiment, as described in FIG. 1C, the G light 13 is in the region centered on the pixel 33G, the R light 12 is in the region centered on the pixel 33R, and the B light 14 is , Incident on the area centered on the pixel 33B. FIGS. 2B to 2D show this state separately for the G light 13, R light 12, and B light 14.

  At this time, depending on the design of the lens array and variations in the incident angles of the R light 12, the G light 13, and the B light 14, it may be possible to collect about 50% of light on the corresponding pixels. Therefore, use efficiency about twice that of the conventional configuration can be achieved.

  Next, the configuration and operation of the light guide plate 24 of the present embodiment for realizing such an efficiency improvement effect will be described.

  FIG. 3 shows a schematic cross-sectional view of the configuration of the light guide plate 24. As shown in FIG. 3, the light guide plate 24 includes a prism sheet 37 and a light guide plate body 38. Although these are separated in FIG. 3, the prism sheet 37 and the light guide plate main body 38 may be integrated. Even when separated, these may be bonded by using an adhesive (not shown) having a close refractive index. Therefore, in the light guide plate 24, a prism sheet 37 made of a material having a high refractive index and wavelength dispersion is disposed on the main surface 23, and a plurality of rising mirrors 40 are formed on the opposing surface 39 facing the main surface 23. The rising mirror 40 is formed in a minute bar shape over almost the front surface of the opposing surface.

  In the light guide plate 24 configured in this way, RGB light 29 composed of R light, G light, and B light is incident from the same side surface 22 of the light guide plate 24 and is raised by the rising mirror 40 on the opposing surface 39 to the prism sheet 37. Led to. At this time, the RGB light 29 travels in the light guide plate main body 38 substantially parallel to the facing surface 39. The RGB light 29 propagates in a state close to parallel light because the beam waist is outside the light guide plate main body 38, but actually spreads slightly. Therefore, a part of the RGB light 29 close to the facing surface 39 is reflected in the direction of the prism sheet 37 by the rising mirror 40 arranged in alignment with the facing surface 39 as RGB light 29a. Since the RGB light 29a is made of a material having a high refractive index wavelength dispersion, the RGB light 29a passes through the prism sheet 37 and is emitted from the emission position 25 of the main surface 23. The G light 13 and the B light 14 have different emission angles and are emitted in a certain direction for each color.

  With this configuration, the R light 12, the G light 13, and the B light 14 can be efficiently incident on the RGB pixels 33 of the liquid crystal display panel 11 as described with reference to FIGS.

  In this embodiment, the light guide plate main body may be made of a resin material containing a scatterer inside. FIG. 4 shows a schematic cross-sectional view of another configuration of the light guide plate 24. FIG. 4 is different from FIG. 3 in that the light guide plate body is made of a resin material containing a scatterer inside.

  As shown in FIG. 4, the light guide plate 24 includes a prism sheet 37 made of a material having a high refractive index and wavelength dispersion disposed on the main surface 23, and a light guide plate body 42 formed of a resin material including a scatterer 41. There is an air layer between the prism sheet 37 and the light guide plate main body 42.

  In the light guide plate 24 configured as described above, RGB light 29 composed of R light, G light, and B light is incident from the same side surface 22 of the light guide plate 24 and is randomly arranged in the light guide plate main body 42. When it encounters a scatterer 41 that is present, it is refracted by the scatterer 41 and the traveling direction is bent. At this time, among the RGB light whose traveling direction is bent by the scatterer 41, the RGB light incident at an angle of about 40 degrees or more with respect to the direction perpendicular to the main surface 23b of the light guide plate main body 42 is totally reflected. Then, the light propagates through the light guide plate main body 42.

  Therefore, the RGB light that can be emitted from the main surface 23b is light that travels at an angle of 40 degrees or less with respect to the direction perpendicular to the main surface 23b, but the RGB light that travels inside the light guide plate body 42 is As the traveling direction approaches the perpendicular to the main surface 23b, the probability is reduced. Therefore, the RGB light emitted from the main surface 23b is emitted with a narrow range of emission angle variations.

  In the experiment, the RGB light 29a emitted from the light guide plate has an angle of ± 7 degrees centered on 67 degrees.

  The RGB light 29 obtained in this way can emit R light 12, G light 13 and B light 14 at different emission angles in the same manner as in the configuration shown in FIG. The light can be efficiently incident on the pixel 33.

  FIG. 5 is a schematic configuration diagram of the light guide plate 24 of FIGS. 3 and 4 as viewed from the direction B. The prism sheet 37 has a configuration in which striped prisms are formed perpendicular to the direction in which RGB light 29 composed of R light, G light, and B light is incident. By configuring in a stripe shape in this way, it is possible to produce by integral molding with a resin material or the like, so that the mass productivity is high. In the case of the light guide plate including the scatterer inside shown in FIG. 4, it has been confirmed by experiments that the angle of the emitted light is biased in a narrow range even in the direction orthogonal to the incident direction. Therefore, the direction of incidence on the light guide plate can be arranged in parallel with the direction of the stripe of the lens array.

  As described above, in the liquid crystal display device of the present embodiment, RGB light is incident from the side surface 22 of the thin light guide plate 24, and R light 12, G light 13 and Since the B light 14 is emitted, the R light 12, the G light 13, and the B light 14 can be condensed and guided to the R pixel 33R, the G pixel 33G, and the B pixel 33B of the liquid crystal display panel 11 by the lens array 26, respectively. . By doing so, it is possible to reduce the amount of light that is lost when the R light 12, the G light 13, and the B light 14 enter the adjacent pixels. Further, for example, the laser light source can be realized by thinning the liquid crystal display device 10 by devising, for example, an optical system dispersed around the light guide plate 24.

  By adopting such a configuration, a liquid crystal display device with high brightness and thinness and high light use efficiency can be realized. In addition, since laser light is used with high efficiency, no extra power is required to obtain the same light output, so that a liquid crystal display device with low power consumption can be further realized.

  Note that the light guide plate of the present embodiment may be configured such that the opposing surface of the light guide plate main body approaches the main surface as it moves away from the side surface on which the RGB light is incident. FIG. 6 is a schematic cross-sectional view of an example of a light guide plate configured based on the configuration of the light guide plate in FIG. 3 so that the opposing surface of the light guide plate main body is closer to the main surface as it is away from the side surface on which the RGB light is incident. That is, the distance between the opposing surface 39 of the light guide plate main body 43 of the light guide plate 24 and the main surface 23 decreases with increasing distance from the same side surface 22 on which the RGB light 29 composed of R light, G light, and B light is incident. Is formed. With such a configuration, the arrangement interval of the rising mirror 40 is further narrowed, and the RGB light 29c reflected by the rising mirror 40 is separated by the prism sheet 37 and emitted from the main surface 23. The light 13 and the B light 14 can be made more uniform in luminance and intensity.

  7 uses the same light guide plate main body 38 as that of FIG. 3 in order to obtain the same effect as that of FIG. That is, the RGB light 29 composed of R light, G light, and B light is further parallel to the main body main surface 51 of the light guide plate main body 38 and the side surface of the light guide plate 24 within an angle range of, for example, −5 ° to + 5 °. Laser beams 44 and 45 are incident from 22. The laser beams 44 and 45 may be monochromatic light or RGB light. Further, instead of entering a plurality of laser beams 44 and 45 from the side surface 22, RGB light 29 composed of R light, G light and B light is −5 ° to a surface parallel to the main body main surface 51 of the light guide plate main body 38. Scanning may be performed in the angle range of + 5 ° or less and incident from the side surface 22 of the light guide plate 38. Note that this incident angle is a guideline, and it is necessary to set an appropriate value so that the luminance is uniform according to the size and thickness of the light guide plate.

  Further, an uneven surface or a lens surface that slightly diffuses the light beam in the thickness direction of the light guide plate 38 may be formed on the side surface 22. With such a configuration, it becomes easy to manufacture a light guide plate that can obtain uniform RGB light from the main surface, and the optical system of the liquid crystal display device can be simplified, so that a liquid crystal display device with higher mass productivity can be realized. .

  In addition, the direction in which the R light, G light, and B light are emitted can be further separated to bring the lens array closer to the pixels, thereby further reducing the thickness of the liquid crystal display device. FIG. 8 shows a schematic cross-sectional view of a light guide plate that can largely separate the emission directions of R light, G light, and B light.

  Here, the light guide plate 24 further includes a laser light introducing portion 46 on the side surface 22, and the laser light introducing portion 46 is configured by at least a prism or a diffractive optical element. In FIG. 8, for example, it is configured as a prism. In this way, when the RGB light 29 enters the light guide plate 38, the R light, G light, and B light (not shown) are separated in substantially the same direction and propagated as RGB light 47. When the light is emitted from the main surface 23 of the light guide plate 24 after propagating through the sheet 37, the R light 48, the G light 49, and the B light 50 are emitted from the main surface 23 at different angles in a certain direction. That is, in the RGB light 47, the directions in which the R light, the G light, and the B light slightly travel are separated by a certain angle.

  With such a configuration, the optical system can be configured so that the branch angles of the R light, the G light, and the B light are increased, so that the distance between the lens array and the pixel can be further reduced, and the liquid crystal display The apparatus can be thinned. In addition, separation on RGB pixels is facilitated, and R light, G light, and B light are condensed on each RGB pixel with good light condensing properties, so that loss of light amount can be reduced.

  8 may be integrated with the light guide plate main body 38, or may be formed integrally with the shape of the light guide plate main body 38 inclined in such a shape. Alternatively, a diffraction grating is provided on the side surface of the light guide plate body 38, and R light, G light, and B light (not shown) are separated in substantially the same direction and propagated as RGB light 47 in the same manner as described in FIG. You may have a function to do.

FIG. 9 shows a schematic perspective view of a lens array for simplifying the optical system of the liquid crystal display device of the present embodiment. FIG. 9A shows a lens array 26 composed of sheet-like cylindrical lenses 52 manufactured corresponding to the RGB pixels 33 of the liquid crystal display panel 11. That is, the lens array 26 has a lined configured as a sheet-like lens width W L cylindrical lens 52 corresponding to the width W of the RGB pixel 33 is in a stripe-shaped liquid crystal display panel 11. With such an arrangement, the R light, G light, and B light assigned to each pixel can be efficiently condensed and guided to the pixels of each color without waste.

  Further, the lens array 26 arranged in correspondence with the RGB pixels 33 in the shape as shown in FIG. 9A can be easily integrally formed in the shape of a sheet in which bar-shaped lenses are arranged, so that mass productivity is further high. A liquid crystal display device can be realized. In addition, when there is no lens, laser light that reaches between a pair of adjacent RGB pixels can be condensed on each color pixel of the RGB pixels by the lens array, so that laser light can be used more efficiently. it can.

  Further, the lens array 26 is configured such that the toric lenses 53 shown in FIG. 9B are arranged in a matrix in the vertical and horizontal directions, and light is also emitted in a direction perpendicular to the direction in which the cylindrical lens 52 in FIG. Light can be condensed without loss. That is, as shown in FIG. 9C, the lens array 26 includes a horizontal width W1 corresponding to the horizontal width of the RGB pixels 33 of the liquid crystal display panel 11 and a vertical width W2 corresponding to the vertical width of the RGB pixels 33. The toric lens 53 having the above is configured as a sheet-shaped lens in which a plurality of the toric lenses 53 are arranged vertically and horizontally. By adopting such a configuration, the lens array arranged corresponding to the RGB pixels can be easily integrally formed in the form of a sheet in which matrix-like lenses are arranged vertically and horizontally. A device can be realized.

  By the way, in this embodiment, the R light, G light, and B light are configured to enter the liquid crystal display panel at different angles. However, when the light is emitted as an image from the liquid crystal display panel, the light is viewed from any angle. However, it is desirable that an image with good uniformity and a wider viewing angle can be obtained. In this embodiment, a diffusion plate is used in order to improve the emission angle characteristics and prevent uneven brightness and color unevenness depending on the viewing angle.

  FIG. 10 shows a schematic structure of the liquid crystal display panel 101 in which a diffusion plate 57 is provided on the exit surface. In this configuration, the R light 12, G light 13 and B light 14 emitted from the light guide plate 24 with different emission angles are condensed by the lens array 26, and the polarizing plate 59a of the liquid crystal display panel 101, the glass The light passes through the plate 56 and the liquid crystal 54 and enters the red pixel 33R, the green pixel 33G, and the blue pixel 33B of the RGB pixel 33.

  After the laser light incident on the RGB pixel 33 is modulated, laser light corresponding to the red pixel 33R, the green pixel 33G, and the blue pixel 33B is selected by the color filter 58, passes through the glass plate 55, and is constant by the polarizing plate 59b. A laser beam having a component in the polarization direction is emitted.

  The laser light that has passed through the polarizing plate 59b is diffused or deflected by the diffusion plate 57, and the emission characteristics of the laser light are corrected and emitted from the liquid crystal display panel 101.

  By adopting such a configuration, the RGB light that has reached the pixel composed of the red pixel, the green pixel, and the blue pixel is efficiently scattered, and the liquid crystal display device has a uniform high brightness without luminance unevenness or color unevenness. Image display can be performed. That is, it is possible to improve the color characteristics of the viewing angle in which the color changes depending on the viewing angle of the liquid crystal display device, and to widen the viewing angle of the liquid crystal display device.

(Embodiment 2)
A liquid crystal display device according to Embodiment 2 of the present invention will be described with reference to FIGS. 11 and 12. In the present embodiment, only the light guide plate is different from the first embodiment, and a diffraction pattern is used instead of a prism in order to separate the laser light into R light, G light, and B light.

  FIG. 11 is a schematic cross-sectional view of the configuration of the light guide plate according to the present embodiment. FIG. 11A shows a configuration using a reflective diffraction pattern, and FIG. 11B shows a configuration using a transmission diffraction pattern. ing.

  As shown in FIG. 11A, the light guide plate 61 is composed of a light guide plate main body 65 and a wavelength-selective reflective diffraction pattern 62 formed in a sheet shape with a photopolymer material. Is formed on a facing surface 64 that faces the main surface 63 of the light guide plate 61.

  A prism 67 is disposed on the side surface 22 of the light guide plate 61 so that the RGB light 29 is incident on the side surface 22 at an angle.

  In the light guide plate 61 configured as described above, RGB light 29 composed of R light, G light, and B light is incident from the same side surface 22 of the light guide plate 61 and is downward several degrees from a direction parallel to the main surface 63. The light is refracted as RGB light 29f so as to travel and reaches the reflection type diffraction pattern 62 at a certain angle.

  Here, the RGB light 29f is diffracted and reflected in different fixed directions for different wavelengths due to the wavelength selectivity of the reflective diffraction pattern 62. The R light, G light, and B light reflected by the reflective diffraction pattern 62 and separated in the traveling direction have different emission angles from the emission position 66 of the main surface 63, and are R light 12, G light 13, and B light. 14 is emitted.

  Further, as another configuration example of the light guide plate 61, FIG. 11B shows a configuration in which a transmission type diffraction pattern is used. As shown in FIG. 11B, the light guide plate 61 includes a light guide plate main body 65 and a wavelength-selective transmission diffraction pattern 68, and the transmission diffraction pattern 68 is formed on the main surface 63 of the light guide plate 61. Is formed.

  11A, the prism 67 is disposed on the side surface 22 of the light guide plate 61 so that the RGB light 29 is incident on the side surface 22 at an angle.

  In the light guide plate 61 configured as described above, the RGB light 29 composed of R light, G light, and B light is incident from the same side surface 22 of the light guide plate 61 and is upward several degrees from a direction parallel to the main surface 63. The light is refracted as RGB light 29g so as to travel and reaches the transmission diffraction pattern 68 at a certain angle.

  Here, the RGB light 29g is diffracted in different fixed directions for each different wavelength due to the wavelength selectivity of the transmissive diffraction pattern 68, and has different emission angles from the emission position 66 of the principal surface 63, and the R light 12, It is emitted as G light 13 and B light 14.

  FIG. 12 shows a schematic cross-sectional view of the main part of the liquid crystal display device 70 of the present embodiment. The liquid crystal display device 70 includes the light guide plate 61 shown in FIG. 11A or 11B and the liquid crystal display panel 101 shown in FIG.

  As shown in FIG. 12, the R light 12, G light 13 and B light 14 emitted from the main surface 63 of the light guide plate 61 in different fixed directions are condensed by the lens array 26 as in the first embodiment. The light efficiently enters the RGB pixel 33 of the liquid crystal display panel 101.

  With such a configuration, a thinner light guide plate and liquid crystal display device can be realized. Furthermore, a liquid crystal display device with high brightness, high light utilization efficiency and low power consumption can be realized by the light guide plate having such a configuration.

  In addition, since the light guide plate is manufactured using a planar diffraction pattern rather than a three-dimensional prism, the light guide plate can be easily manufactured, and a liquid crystal display device with high mass productivity can be realized.

  Note that the diffraction pattern is made of a photopolymer material, in which R light, G light, and B light are incident from the direction of incident light, and R light, G light, and B light are incident from a direction opposite to the direction in which diffracted light is generated. The interference pattern can be generated and baked on the sheet-like photopolymer material.

  In the present embodiment, the prism 67 is arranged on the side surface 22, but these may be formed integrally with the light guide plate 61, and a diffractive element that diffracts in the thickness direction is used instead of the prism 67 on the side surface. 22 may be provided.

(Embodiment 3)
A liquid crystal display device according to Embodiment 3 of the present invention will be described with reference to FIGS. In this embodiment, a polyhedral mirror is used instead of a prism in order to separate laser light into R light, G light, and B light.

  FIG. 13 is a schematic perspective view of the configuration of the light guide plate used in the liquid crystal display device according to the present embodiment. FIG. 13 (a) is a schematic perspective view of the light guide plate 71, and FIG. 13 (b) is a broken line in FIG. It is a schematic block diagram of the principal part which expanded the principal part of C enclosed by.

  As shown in FIGS. 13A and 13B, the light guide plate 71 has a plurality of polyhedral mirrors 74 formed on an opposing surface 73 facing the main surface 72, and the polyhedral mirror 74 has at least three reflecting mirror surfaces 82R and 82G. , 82B.

  In the present embodiment, the R light 75, the G light 76, and the B light 77 are configured to enter separately from three different side surfaces 78, 79, and 80 of the light guide plate 71, and the reflection mirror surfaces 82R and 82G. , 82B reflect the R light 75, G light 76 and B light 77 incident from three different side surfaces 78, 79, 80 of the light guide plate 71 in the direction of the main surface 72, and from the emission position 81 of the main surface 72. R light 12, G light 13 and B light 14 are emitted in different directions.

  The operation of the light guide plate 71 configured as described above will be described with reference to FIG. FIG. 14 shows a schematic configuration diagram of a light guide plate used in the liquid crystal display device according to the present embodiment. 14A is a schematic configuration diagram viewed from the main surface 72, FIG. 14B is a schematic cross-sectional diagram viewed from the CC line section of FIG. 14A, and FIG. 14C is viewed from the DD line cross section. A schematic sectional view is shown.

  In FIG. 14A, a large number of polyhedral mirrors 74 are arranged vertically and horizontally in a matrix on an opposing surface (not shown) facing the main surface 72 of the light guide plate 71.

  In addition, the B light has a larger amount of light absorption with respect to the resin material serving as the light guide plate material than the R light and G light, and if the propagation distance becomes longer, it is affected by the light absorption loss. It is set as the structure which injects from the side 80 of this.

  In the light guide plate 71 configured as described above, the R light 75 is incident on the main surface 72 from the side surface 78, the G light 76 is incident on the side surface 79, and the B light 77 is incident on the main surface 72 in parallel.

  At this time, as shown in FIG. 14B, the B light 77 travels in the light guide plate 71 as B light 77a and 77b substantially parallel to the main surface 72 and the opposing surface 73. Since the B light 77 has a beam waist outside the light guide plate 71, the B light 76a, 77b propagates in a state close to parallel light, but actually spreads slightly. Therefore, a part of the B light 77 b close to the facing surface 73 is reflected in the direction of the main surface 72 by the polyhedral mirror 74 arranged in alignment with the facing surface 73 and is emitted as the B light 14.

  Similarly, as shown in FIG. 14 (c), the R light 75 and the G light 76 propagate as R light 75a, 75b and G light 76a, 76b through the light guide plate 71 in a state close to parallel light. Spread and propagate. Therefore, by the polyhedral mirror 74 arranged in alignment with the facing surface 73, a part of the R light 75b and the G light 76b close to the facing surface 73 is reflected in the direction of the main surface 72 and emitted as the R light 12 and the G light 13. To do.

  FIG. 15 is a schematic cross-sectional view of the main part of the liquid crystal display device 90 of the present embodiment. The liquid crystal display device 90 includes the light guide plate 71 described in this embodiment and the liquid crystal display panel 101 shown in FIG. However, since the emitting directions of the R light 12, the G light 13, and the B light 14 are different from those of the first and second embodiments, the order in which the R pixel, the G pixel, and the B pixel are arranged is changed.

  As shown in FIG. 15, the R light 12, the G light 13, and the B light 14 emitted from the main surface 63 of the light guide plate 71 in different fixed directions are condensed by the lens array 26 as in the first embodiment. Then, the light efficiently enters the RGB pixel 33 of the liquid crystal display panel 101.

  With such a configuration, a liquid crystal display device with high luminance, high light use efficiency, and low power consumption can be realized by an optical system including such a light guide plate.

  In the second and third embodiments, as in the first embodiment, the opposing surface that opposes the main surface of the light guide plate is tilted with respect to the main surface so as to approach the main surface as the distance from the side surface on which the laser light enters is increased. You may comprise.

  The lens array may be a sheet-like lens in which cylindrical lenses are arranged in stripes, or a sheet-like lens in which a plurality of toric lenses are arranged vertically and horizontally.

  The incident light may be introduced into the light guide plate by inclining the incident light with respect to the side surface of the light guide plate, or by scanning the incident light so as to change the incident angle of the incident light with respect to the side surface. May be.

  The liquid crystal display device of the present invention is useful in the field of displays such as large displays and high brightness displays because it has high brightness, thinness, low power consumption and high productivity.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the liquid crystal display device concerning Embodiment 1 of this invention, (a) Schematic perspective view of a liquid crystal display device (b) Schematic block diagram of the front of a liquid crystal display device (c) AA of (b) Schematic cross section of the main part as seen from the cross section BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the principal part of the liquid crystal display device concerning Embodiment 1 of this invention, (a) Schematic sectional drawing in case RGB light radiate | emits perpendicular | vertical (b) R light, G light, and B light are efficient. Schematic sectional view showing contents to be condensed (c) Schematic sectional view showing contents to which R light, G light and B light are efficiently condensed (d) Condensing R light, G light and B light efficiently Schematic sectional view showing the contents Schematic sectional view of the configuration of the light guide plate according to the first embodiment of the present invention. Schematic sectional view of the configuration of another light guide plate according to the first embodiment of the present invention. Schematic configuration diagram of the light guide plate of FIGS. 3 and 4 viewed from the direction B Schematic sectional view of the configuration of another light guide plate according to the first embodiment of the present invention. Schematic sectional view showing an incident light incident method according to the first embodiment of the present invention. Schematic sectional view showing another incident light incident method according to the first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of a lens array according to a first embodiment of the present invention, (a) showing a lens array composed of sheet-like cylindrical lenses, and (b) showing a lens array in which toric lenses are arranged in a matrix form vertically and horizontally. (C) A diagram showing a lens array in which toric lenses are arranged in a matrix form vertically and horizontally. 1 is a schematic cross-sectional view of a configuration of a liquid crystal display device using a diffusion plate according to a first embodiment of the present invention. It is a schematic sectional drawing of the structure of the light-guide plate used for the liquid crystal display device concerning Embodiment 2 of this invention, (a) The figure which shows the example using a reflection type diffraction pattern (b) The example using a transmission type diffraction pattern Illustration Schematic sectional view of a liquid crystal display device according to a second embodiment of the present invention. It is a schematic perspective view of the liquid crystal display device concerning Embodiment 3 of this invention, (a) The schematic perspective view of a light-guide plate, (b) The schematic block diagram which expanded the principal part of C enclosed with the broken line of (a) It is a schematic block diagram of the light-guide plate used for the liquid crystal display device concerning Embodiment 3 of this invention, (a) The schematic block diagram seen from the main surface (b) The outline seen from the cross section of CC line of (a) Sectional drawing (c) Schematic sectional view seen from the section of line DD in (a) Schematic sectional view of a liquid crystal display device according to Embodiment 3 of the present invention.

Explanation of symbols

10, 60, 70, 90 Liquid crystal display device 11, 101 Liquid crystal display panel 12, 12a, 12b, 12c, 12d, 16, 36a, 48, 75, 75a, 75b Red laser light (R light)
13, 13a, 13b, 13c, 13d, 17, 49, 76, 76a, 76b Green laser light (G light)
14, 14a, 14b, 14c, 14d, 18, 36b, 50, 77, 77a, 77b Blue laser light (B light)
15 Planar illumination device 19 Red laser light source (R light source)
20 Green laser light source (G light source)
21 Blue laser light source (B light source)
22, 78, 79, 80 Side surface 23, 23b, 63, 72 Main surface 24, 61, 71 Light guide plate 25, 66, 81 Output position 26 Lens array 27, 28 Dichroic mirror 29, 29a, 29b, 29c, 29d, 47 RGB light 30, 82, 82R, 82G, 82B Reflection mirror 31 Light distribution section 32 Mirror 33 RGB pixel 33B Blue pixel (B pixel)
33G Green pixel (G pixel)
33R Red pixel (R pixel)
34 Lens 35a, 36b Eye 37 Prism sheet 38, 42, 43, 65 Light guide plate main body 39, 64, 69, 73 Opposing surface 40 Rising mirror 41 Scattering body 44, 45 Laser light 46 Laser light introducing part 51 Main body main surface 54 Liquid crystal 55, 56 Glass plate 57 Diffuser plate 58 Color filter 59a, 59b Polarizing plate 62 Reflective diffraction pattern 67 Prism 68 Transmission diffraction pattern 74 Polyhedral mirror 101 Liquid crystal display panel

Claims (15)

  1. A liquid crystal display panel;
    A lens array provided corresponding to the arrangement of pixels composed of red pixels, green pixels and blue pixels of the liquid crystal display panel;
    A planar illumination device that emits at least red, green, and blue laser light from one main surface and is incident on each lens of the lens array at a constant and different incident angle for each color;
    The planar illumination device has a laser light source that emits at least red, green, and blue laser beams, and the red, green, and blue laser beams are incident from the side surfaces and have different emission angles from the one main surface. A light guide plate that emits
    The red, green, and blue laser lights are emitted from the one main surface of the light guide plate at different emission angles, and then condensed in different directions by the lenses, respectively, and the red pixel, the green pixel, and the blue pixel, respectively. A liquid crystal display device that is incident on the liquid crystal display device.
  2. The light guide plate is configured to include a prism sheet made of a material having a high wavelength dispersion of a refractive index disposed on the main surface, and a plurality of rising mirrors are formed on an opposing surface facing the main surface,
    The red, green, and blue laser beams are incident from the same side surface of the light guide plate, are guided to the prism sheet by the rising mirror on the opposing surface, and are emitted from the main surface with different emission angles. The liquid crystal display device according to claim 1.
  3. The light guide plate is composed of a prism sheet made of a material having a high refractive index wavelength dispersion disposed on the main surface, and a light guide plate body formed of a resin material including a scatterer,
    The red, green, and blue laser beams are incident from the same side surface of the light guide plate, are guided to the prism sheet by the scatterers of the light guide plate body, and are emitted from the main surface with different emission angles. The liquid crystal display device according to claim 1.
  4. 4. The liquid crystal display device according to claim 2, wherein the prism sheet is formed with stripe-shaped prisms perpendicular to a direction in which the red, green, and blue laser beams are incident. 5.
  5. The light guide plate has a wavelength-selective transmission diffraction pattern formed on the main surface,
    The red, green, and blue laser beams are incident from the same side surface of the light guide plate, are guided to the transmission type diffraction pattern, and are emitted from the main surface with different emission angles. Item 2. A liquid crystal display device according to item 1.
  6. The light guide plate is formed on an opposing surface where the wavelength-selective reflective diffraction pattern is opposed to the inner main surface,
    The red, green, and blue laser beams are incident from the same side surface of the light guide plate, and are emitted from the main surface with different emission angles by the reflective diffraction pattern on the facing surface. The liquid crystal display device according to claim 1.
  7. 3. The facing surface of the light guide plate is formed so that the distance from the main surface decreases as the distance from the same side on which the red, green, and blue laser beams are incident is increased. The liquid crystal display device according to claim 6.
  8. In the light guide plate, a plurality of polyhedral mirrors are formed on an opposing surface facing the inner main surface, and the red, green, and blue laser beams are incident from three different side surfaces of the light guide plate and the opposing surface 2. The liquid crystal display device according to claim 1, wherein the polyhedral mirror emits light with different exit angles from the main surface.
  9. The liquid crystal display device according to claim 8, wherein the blue laser light is incident from a long side surface of the light guide plate.
  10. 10. The liquid crystal according to claim 8, wherein the polyhedral mirror includes at least three reflecting mirrors that reflect laser light incident from three different side surfaces of the light guide plate in a direction of the main surface. 11. Display device.
  11. The lens array is a sheet-like lens in which cylindrical lenses having a width corresponding to a width of a pixel composed of the red pixel, the green pixel, and the blue pixel of the liquid crystal display panel are arranged in a stripe shape. The liquid crystal display device according to claim 1.
  12. The lens array includes a horizontal width corresponding to a horizontal width of the pixel composed of the red pixel, the green pixel and the blue pixel of the liquid crystal display panel and a vertical length of the pixel composed of the red pixel, the green pixel and the blue pixel. 11. The liquid crystal display according to claim 1, wherein the toric lens having a vertical width corresponding to the width in the direction is a sheet-like lens in which a plurality of toric lenses are arranged in the vertical and horizontal directions. apparatus.
  13. The laser light is diffused or deflected by a correction plate disposed adjacent to the outside of any one of the glass plates sandwiching the RGB pixels of the liquid crystal display panel, and the emission characteristics of the laser light from the liquid crystal display panel are adjusted. The liquid crystal display device according to claim 1, wherein correction is performed.
  14. 14. The liquid crystal display device according to claim 1, wherein the red, green, and blue laser beams are incident from a side surface of the light guide plate by scanning an incident angle or an incident position. .
  15. The light guide plate further includes a laser light introduction part on the side surface,
    15. The liquid crystal display device according to claim 1, wherein the laser beam introduction unit includes an optical element that separates or spreads a laser beam composed of the red, green, and blue laser beams. .
JP2007026719A 2007-02-06 2007-02-06 Liquid crystal device Pending JP2010101912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007026719A JP2010101912A (en) 2007-02-06 2007-02-06 Liquid crystal device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007026719A JP2010101912A (en) 2007-02-06 2007-02-06 Liquid crystal device
PCT/JP2008/050741 WO2008096589A1 (en) 2007-02-06 2008-01-22 Liquid crystal display device

Publications (1)

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JP2010101912A true JP2010101912A (en) 2010-05-06

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WO (1) WO2008096589A1 (en)

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US9595627B2 (en) 2013-03-15 2017-03-14 John Paul Morgan Photovoltaic panel
US9714756B2 (en) 2013-03-15 2017-07-25 Morgan Solar Inc. Illumination device
US9960303B2 (en) 2013-03-15 2018-05-01 Morgan Solar Inc. Sunlight concentrating and harvesting device

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US9464782B2 (en) 2013-03-15 2016-10-11 Morgan Solar Inc. Light panel, optical assembly with improved interface and light panel with improved manufacturing tolerances
US9595627B2 (en) 2013-03-15 2017-03-14 John Paul Morgan Photovoltaic panel
US9714756B2 (en) 2013-03-15 2017-07-25 Morgan Solar Inc. Illumination device
US9732938B2 (en) 2013-03-15 2017-08-15 Morgan Solar Inc. Illumination panel
US9960303B2 (en) 2013-03-15 2018-05-01 Morgan Solar Inc. Sunlight concentrating and harvesting device

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