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Backlight device

A backlight and light source technology, applied in the field of backlight devices, can solve problems such as looseness, and achieve the effect of small width and preventing glare

Inactive Publication Date: 2004-12-08
SHARP KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, if the double-sided adhesive tape that causes irregular reflections is eliminated, the attachment of the reflective layer 108 and the diffuser layer 109 to the light guide plate 111 will become loose.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] image 3 is a perspective view showing the backlight unit 202 of Embodiment 1 of the present invention. Figure 4 is a partial sectional view showing a liquid crystal display device with a backlight 202 and a liquid crystal display panel 201 .

[0047] Such as image 3 As shown, the backlight device 202 includes a reflector 6, a light guide plate 11 and an end face 11a ( Figure 4 ) light source lamps such as fluorescent lamps 5 ( Figure 4 ).

[0048] Such as Figure 4 As shown, on the output surface of the light guide plate 11, that is, the surface 11b facing the liquid crystal display panel 201 (hereinafter referred to as “the first main surface 11b of the light guide plate”), a diffusion layer 9 for diffusing light is provided. In addition, an output area 13 is provided on the first main surface 11b of the light guide plate 11 to output the light incident from the end surface facing the lamp 5 . In addition, a plurality of prism layers 10 for controlling the d...

Embodiment 2

[0059] Figure 5 It is a perspective view showing the backlight unit 252 of Embodiment 2 of the present invention. Figure 4 is a partial sectional view showing a liquid crystal display device with a backlight 252 and a liquid crystal display panel 201 . In Embodiment 2, the same components as those in Embodiment 1 are denoted by the same reference numerals.

[0060] The backlight 252 of Embodiment 2 includes an area between the reflector 6 and the prism layer 10 (arranged to include the output area 13 ) disposed above the first main surface 11 b of the light guide plate 11 formed by black ink printing or the like The anti-reflection member 14 having the length of the lamp 5 in it. Examples of black ink include mixtures of polyester resins with various solvents and color pigments, and the like.

[0061] In Embodiment 2, the same effects as in Embodiment 1 described above can be obtained.

[0062] By using the black tape as the anti-reflection member, various steps of attac...

Embodiment 3

[0065] Figure 6 is a perspective view showing a backlight unit 302 according to Embodiment 3 of the present invention. Figure 7 is a partial sectional view showing a liquid crystal display device with a backlight 302 and a liquid crystal display panel unit 301 . In Embodiment 3, the same components as those in Embodiment 1 are denoted by the same reference numerals.

[0066] The backlight device 302 of Embodiment 3 of the present invention includes an anti-reflection member 16 with the length of the lamp 5 formed on the back of the reflector 6 by black ink printing, black tape or the like. In both cases of using the black ink as the antireflection member 16 and using the black tape as the antireflection member 16, substantially the same effect of avoiding the glare of the displayed image can be obtained.

[0067] Embodiment 3 can obtain the same effect as that of Embodiment 1 described above.

[0068] Furthermore, according to Embodiment 3 of the present invention, by att...

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Abstract

A backlight device includes: a light source; a light-guiding plate; and a reflector. The light-guiding plate has a first principal surface, a second principal surface and an end surface. The reflector is disposed so as to illuminate the end surface with light from the light source. The light-guiding plate has an output region on the first principal surface, for outputting light inputted from the end surface. An anti-reflection member is provided above the first principal surface in a region between the output region and the end surface.

Description

technical field [0001] The present invention relates to a backlight with a light source positioned beside its side for illuminating a display unit, such as a liquid crystal display, which does not emit light by itself. Background technique [0002] In recent years, with the development of hardware technology, notebook type personal computers, personal digital assistants (PDAs) and the like having functions of desktop computers have been widely used. [0003] Currently, the display unit of the above-mentioned notebook personal computer or personal digital assistant usually adopts a liquid crystal display panel. [0004] However, the above-mentioned liquid crystal display panel itself does not have a light-emitting function. Therefore, as a method for enabling a liquid crystal display panel to display information, the liquid crystal display panel adopts either a backlight type method in which a light source is located on the back of the liquid crystal display panel or a refle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00F21V8/00G02F1/1335G02F1/13357
CPCG02B6/005G02B6/0031
Inventor 中村京太郎藤山裕
Owner SHARP KK
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