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Liquid crystal display device

A liquid crystal display device, laser technology, applied in lighting devices, optics, light sources, etc., can solve the problems of low utilization efficiency, limited improvement of light utilization efficiency, waste of light, etc., and achieve the effect of simple brightness

Inactive Publication Date: 2010-12-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in the above-mentioned prior art, the utilization efficiency when providing the light emitted from the light guide plate to the liquid crystal panel is still very low.
In particular, there is no concept of reuse of the light reflected by the liquid crystal panel back to the light guide plate, resulting in waste of light
Therefore, in the prior art described above, there is a limit to the improvement of light utilization efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0073] Figure 2A ~ Figure 2C It is a diagram illustrating the configuration of the liquid crystal display device 10 according to the first embodiment of the present invention. Figure 2A From figure 1 The sagittal graph seen at point A in, Figure 2B yes figure 1 The vertical section of the B-B line in the XZ plane, Figure 2C yes figure 1 The vertical section of the middle C-C line on the XY plane. in addition, Figure 2A The laser light 12 (dotted arrow) transmitted through the liquid crystal panel 22 and propagating in the light guide plate 14 is depicted in .

[0074] Figure 2A Among them, the laser light source unit 11 includes: a red laser light source 11r, a green laser light source 11g, a blue laser light source 11b, collimator lenses 13r, 13g, and 13b, and dichroic mirrors 12K and 12L. The red laser light source 11r emits red laser light, the green laser light source 11g emits green laser light, and the blue laser light source 11b emits blue laser light. Th...

no. 2 approach

[0099] Figure 9A and 9B It is a figure explaining the structure of the liquid crystal display device 20 which concerns on 2nd Embodiment of this invention. Figure 9A From figure 1 The sagittal graph seen at point A in, Figure 9B yes figure 1 The vertical section of the B-B line in the XZ plane, Figure 9C yes figure 1 The vertical profile of line C-C in XY plane. in addition, Figure 9A is depicted to be able to understand the laser light 12 passing through the liquid crystal panel 22 and propagating in the light guide plate 14 (dotted arrow).

[0100] The liquid crystal display device 20 according to the second embodiment is different from the liquid crystal display device 10 according to the above-mentioned first embodiment in the light guide plate 31 and the wavelength selection substrate 33 , and the other configurations are the same. The liquid crystal display device 20 will be described below regarding this difference.

[0101] The structure of the light guid...

no. 3 approach

[0110] Figure 10A and Figure 10B It is a figure explaining the structure of the liquid crystal display device 30 which concerns on 3rd Embodiment of this invention. Figure 10A From figure 1 The sagittal graph seen at point A in, Figure 10B yes figure 1 The vertical profile of the B-B line in the XZ plane. in addition, Figure 10A is depicted to be able to understand the laser light 12 transmitted through the liquid crystal panel 32 and propagating in the light guide plate 14 (dotted arrow).

[0111] The liquid crystal display device 30 according to the third embodiment is different from the liquid crystal display device 10 according to the above-mentioned first embodiment in the structure of the wavelength selection substrate 23 and the liquid crystal panel 32 , and the other structures are the same. The liquid crystal display device 30 will be described below regarding this difference.

[0112] The liquid crystal panel 32 includes a liquid crystal layer 22a, a wave...

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Abstract

Disclosed is a liquid crystal display device including a wavelength-selective substrate (23) composed of a wavelength-selective portion (23R) through which only red laser light is transmitted and which reflects other light, a wavelength-selective portion (23G) through which only green laser light is transmitted and which reflects other light, and a wavelength-selective portion (23B) through which only blue laser light is transmitted and which reflects other light. Laser light corresponding to the light colours transmitted by the wavelength-selective portions, from laser light (12) emitted from a light guide panel (14), is transmitted through the wavelength-selective substrate (23) without alteration and falls incident on a liquid crystal panel (22), while the non-correspondent laser light is reflected by the wavelength-selective substrate (23) and returned to the light guide panel (14). The laser light returned to the light guide panel (14) is reflected by a reflective panel (21) and caused to again fall incident on the wavelength-selective substrate (23). The laser light is repeatedly reflected and returned until the laser light is transmitted through the wavelength-selective portions. This repeated process of transmission and reflection splits the laser light (12) into the colors of red, green and blue which are emitted from the wavelength-selective substrate (23).

Description

technical field [0001] The present invention relates to a liquid crystal display device which uses a laser light source as a light source and realizes high efficiency and uniform luminance. Background technique [0002] Conventionally, cold-cathode fluorescent lamps (hereinafter referred to as CCFLs) are often used as light sources for liquid crystal display devices. As the backlight method using this CCFL, there are generally known side-light type and direct-light type. The side-light type is that the light of the CCFL enters from the side of the light guide plate, and exits from the front of the light guide plate as approximately uniform planar light, and The liquid crystal panel is irradiated with planar light from the back, and the direct type is to arrange a plurality of CCFLs on the back of the liquid crystal panel, and directly irradiate the liquid crystal panel with the light of the CCFLs. [0003] However, in recent years, from the viewpoint of environmental proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00G02F1/13357F21Y101/02
CPCG02F1/133621G02B6/0038G02B6/0036G02B6/0028
Inventor 式井慎一永田贵之伊藤达男山本和久门胁慎一
Owner PANASONIC CORP
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