Lighting device and image display unit and light guide provided with it

A lighting device and light guide technology, which is applied to the image display device and light guide body equipped with the device, the image display device and light guide body, and the field of lighting devices. Display quality degradation and other issues

Inactive Publication Date: 2006-02-15
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the utilization efficiency of light decreases
In addition, if the illuminating device 900 is used as a front light source, light is emitted from the viewer's side, so the display quality is degraded.
[0043] As described above, the current situation is that no lighting device capable of emitting light from a light source as light in a specific polarization direction sufficiently efficiently has yet to be developed.

Method used

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  • Lighting device and image display unit and light guide provided with it
  • Lighting device and image display unit and light guide provided with it
  • Lighting device and image display unit and light guide provided with it

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0152] First, refer to figure 1 The configuration of the lighting device 120 according to the embodiment of the present invention and the liquid crystal display device (image display device) 100 including the lighting device 120 will be described.

[0153] Such as figure 1 As shown, the liquid crystal display device 100 is a reflective liquid crystal display device including a reflective liquid crystal display panel 110 and an illuminating device (front light source) 120 .

[0154] The reflective liquid crystal display panel 110 is a known reflective liquid crystal display panel, and here, it has a pair of substrates (for example, glass substrates) 111 and 112 and a liquid crystal layer 113 disposed therebetween. The reflective electrode 114 is provided on the liquid crystal layer 113 side of the substrate 111 on the rear side, and a transparent electrode (not shown) is provided on the liquid crystal layer 113 side of the observer-side substrate 112 . In addition, a polari...

no. 2 Embodiment approach

[0185] refer to Figure 5 The configuration of the lighting device 220 and the liquid crystal display device (image display device) 200 including the lighting device 220 according to the embodiment of the present invention will be described. In the subsequent drawings, for the sake of simplicity of description, the same reference numerals are used to denote components having substantially the same functions as those of the lighting device 120 and the liquid crystal display device 100 according to the first embodiment, and part of the description thereof is omitted.

[0186] Such as Figure 5 As shown, the liquid crystal display device 200 is a reflective liquid crystal display device including a reflective liquid crystal display panel 210 and an illuminating device (front light source) 220 .

[0187] The reflective liquid crystal display panel 210 is a known reflective liquid crystal display panel, and has, for example, the same structure as the reflective liquid crystal disp...

no. 3 Embodiment approach

[0258] refer to Figure 25 The configuration of the lighting device 320 and the liquid crystal display device (image display device) 300 including the lighting device 320 according to the embodiment of the present invention will be described.

[0259] Such as Figure 25 As shown, the liquid crystal display device 300 is a reflective liquid crystal display device including a reflective liquid crystal display panel 310 and an illuminating device (front light source) 320 .

[0260] The reflective liquid crystal display panel 310 is a known reflective liquid crystal display panel, and has, for example, the same structure as the reflective liquid crystal display panel 110 included in the liquid crystal display device 100 of the first embodiment.

[0261] The light guide 20 of the lighting device 320 includes a polarization selection layer 22 disposed near the emission surface 20 c and a polarization conversion layer 24 disposed on the opposing surface 20 d side. In this embodimen...

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Abstract

A lighting device comprising a light source (10), and a light guide (20) having an incident surface (20a) for receiving a light emitted from the light source (10) and an output surface (20c) for outputting a light entered via the incident surface (20a). The light guide (20) has a polarization selection layer (22) for selectively outputting via the output surface (20c) a light in a specific polarization direction (first polarization) out of lights incident via the incident surface (20a), and a polarization conversion layer (24) for converting a second polarization different in polarization direction than the first polarization into the first polarization. The polarization selection layer (22) substantially reflects the first polarization toward the output surface (20c) side only.

Description

technical field [0001] The present invention relates to an illuminating device, an image display device including the same, and a light guide, and particularly relates to an illuminating device with high light utilization efficiency, an image display device including the same, and a light guide. Background technique [0002] In recent years, liquid crystal display (Liquid Crystal Display) has been widely used in OA equipment such as word processors and personal computers, mobile information equipment such as electronic notepads, or devices equipped with liquid crystal monitors, taking full advantage of its thin thickness and low power consumption. Among camera-sized VTRs, etc. [0003] Non-luminescent display devices represented by liquid crystal display devices are different from self-luminous display devices such as CRT (Cathode Ray Tube: Cathode Ray Tube), PDP (Plasma Display Panel: Plasma Display Panel) and EL (Electro Luminescence: Electroluminesce...

Claims

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Application Information

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IPC IPC(8): F21V8/00G02F1/13357G02B5/30F21Y103/00G02B6/00G02F1/1335
Inventor 增田岳志
Owner SHARP KK
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