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Light guiding plate, illumination device, and liquid crystal display device

A technology for lighting devices and light guides, which is applied in the field of light guides, liquid crystal display devices, and lighting devices, and can solve problems such as damage to the appearance of liquid crystal display devices, reduced black display contrast, and increased component costs, achieving good visibility, High contrast, brightening effect

Inactive Publication Date: 2004-12-01
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when external light G is incident on the front mask 130, backscattered light ( Figure 22 The light H in the middle, sometimes due to the scattered light H, the contrast of the black display is reduced
[0009] In addition, in the manufacturing process of the liquid crystal display device, foreign matter may be mixed between the light guide body 112 and the front cover 130, and the appearance of the liquid crystal display device may be damaged.
[0010] Moreover, the front mask 130 and the light guide body 112 need to be separately provided, which increases the number of parts constituting the liquid crystal display device and increases the cost of the parts.

Method used

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  • Light guiding plate, illumination device, and liquid crystal display device
  • Light guiding plate, illumination device, and liquid crystal display device
  • Light guiding plate, illumination device, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] In this example, for Figure 1 ~ Figure 3 light guides of the novel shape shown, and Figure 20 The shown conventional light guides were compared in terms of the amount of emitted light and the amount of light leaked when the inclination angle of the inclined portion from which the propagating light was emitted was optimized with respect to the incident angle of the propagating light.

[0164] Table 1 is a table that summarizes and expresses the parameters of each part of the light guide body compared in this example. In this table, the novel shape represents image 3 light guide shown, the existing shape represents Figure 20 light guide shown. Moreover, θ in the novel shape 1 , θ 2 Respectively image 3 The angle of inclination shown, θ in the existing shape 1 , θ 2 Respectively Figure 20 The angle of inclination shown. Moreover, the size of the light guides is 70mm W×50mm L×1.0mm t, and the material is all acrylic resin (refractive index: 1.48).

[0165] Next...

Embodiment 2

[0168] Secondly, yes in image 3 The protrusion 14 formed on the outgoing surface 12b of the light guide body 12 of the present invention shown, and the Figure 20 The reflection characteristics of the protrusions 114 formed on the upper surface of the shown conventional light guide 112 with respect to propagating light incident from inside the light guide were compared. The comparison results are shown in Tables 2 to 5 below. Table 2 and Table 3 show the reflection characteristics of the light guide of the present invention, that is, the protrusions of a novel shape, and Tables 4 and 5 show the reflection characteristics of the protrusions of a conventional shape. In addition, Table 2 and Table 4 show the results when the constituent material of the light guide is Arton (trade name: manufactured by JSR Corporation), and Table 3 and Table 5 show the results when the constituent material of the light guide is acrylic resin. .

[0169] In these tables, the angles of incidence ...

Embodiment 3

[0186] In this example, for the Figure 1 ~ Figure 3 The light guide of the present invention of the novel shape shown, and Figure 20 The brightness and contrast of the liquid crystal display device with the light guide body of the conventional shape shown were compared.

[0187] As a light guide of novel shape 3, making image 3 The inclination angle θ shown 1 2.8°, θ 2 45°, the size of the light guide body is 70mm W×50mm L×1.0mm t, the material is acrylic resin (refractive index 1.48), and the protective layer laminated on the light guide body is made of urine with a thickness of 500 Å (50nm). Alkacrylate-based hard coating material that is UV-curable.

[0188] Furthermore, as the light guide of the conventional shape 3, the Figure 20 The inclination angle θ shown 1 2.8°, θ 2 45°, the size of the light guide is 70mm W×50mm L×1.0mm t, the material is acrylic resin (refractive index 1.48), and the structure that omits the front mask is used.

[0189] Furthermore, as a ...

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Abstract

An illumination device having high contrast and high brightness, capable of reducing the quantity of leaking light, and capable of being made thin is provided. The illumination device includes a light source and a light guiding plate 12 that introduces light of the light source from a side end face to the inside of the light guiding plate 12 and emits the light that propagates the inside of the light guiding plate from an emitting face. Prismatic shapes for reflecting the propagated light inside the light guiding plate 12 and emitting the reflected light to the emitting face are formed on the emitting face of the light guiding plate 12.

Description

technical field [0001] The invention relates to an illuminating device, a light guide and a liquid crystal display device. Background technique [0002] Illumination devices such as front lights used in liquid crystal display devices, etc., are basically composed of a light guide and a light source provided on its side end surface, and the light introduced from the side end surface of the light guide is emitted from the exit surface of the light guide and Reflected by the prism shape formed on the opposite surface, it emits from the emission surface, and illuminates an object to be illuminated such as a liquid crystal panel (for example, Patent Document 1). [0003] Figure 20 It is a diagram showing a cross-sectional structure of a liquid crystal display device having such a conventional lighting device. Figure 21 and Figure 22 for illustration Figure 20 An explanatory diagram of the light guiding state of the front light shown. [0004] Figure 20 The shown liquid cr...

Claims

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Application Information

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IPC IPC(8): F21V8/00G02B6/00G02F1/13357
CPCG02F2001/133616G02F1/133615G02B6/0038G02B6/0046G02B6/0028G02F1/133616
Inventor 鹿野满大泉满夫宫田裕安
Owner ALPS ALPINE CO LTD
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