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Direct type backlight

A backlight, direct type technology, applied in the directions of optics, light guides, light sources, etc., can solve the problems of the decline of the luminous quality of the backlight, the increase of the assembly cost, and the increase of the number of backlight components.

Inactive Publication Date: 2008-01-30
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When deformation such as bending occurs on the diffuser plate, the uniformity of diffusion of transmitted light decreases, so the quality of light emitted as a backlight decreases.
Furthermore, in the case of using a display unit such as a liquid crystal panel and optical sheets, deformation along the diffusion plate will also cause deformation on these optical sheets and the liquid crystal panel, resulting in uneven liquid crystal display.
Furthermore, since the upper frame and the like are integrated with the diffuser plate, the number of components of the backlight increases, and the assembly cost increases due to the management cost of the components and the increase in the number of assembly processes of the backlight.

Method used

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Examples

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Embodiment Construction

[0044] Fig. 1 shows the schematic structure of the direct-type backlight 1 for the liquid crystal display device according to the first embodiment of the present invention, which is an expanded oblique view, and Fig. 3 is its cross-sectional view (the cross-section perpendicular to the longitudinal direction of the light source 10). section view). The direct type backlight 1 includes a box-shaped lower frame 2 having an opening 11 on the upper side, and a plurality of light sources 10 arranged in parallel to each other inside the lower frame 2 . In addition, the direct type backlight 1 further includes a diffusion plate integrated frame portion 3 disposed on the opening portion 11 of the lower frame 2 to close the aforementioned opening portion 11, and 2 diffuser plate integrated frame portions arranged to overlap each other along the outer surface of the diffuser plate integrated frame portion 3. One optical sheet 12, 13, and a double-sided tape 14 for adhering the optical sh...

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Abstract

This invention provides a direct backlight with further reduced number of parts and capable of improving light emitting quality level by controlling the deformation of a diffuser panel. This direct backlight is provided with a diffuser panel solid frame part 3 wherein a diffuser panel 4 transmitting and diffusing light from a light source 10 and a frame part 5 provided in the periphery of the diffuser panel 4 are integrally molded, and a lower frame 2 having an opening part 11 where the diffuser panel 4 is disposed and in which the light source 10 is disposed. The diffuser panel 4 has a thickness changing part h where the thickness continuously increases from a central side to a peripheral edge side.

Description

technical field [0001] The invention relates to a direct type backlight. Background technique [0002] Backlights used in liquid crystal display devices and the like are roughly classified into edge-type backlights and direct-type backlights. Among them, the direct type backlight is widely used as a large flat light-emitting device in particular because it is suitable for upsizing and is easy to obtain high luminance. Furthermore, in liquid crystal display devices, direct type backlights are increasingly used as planar light emitting devices used for large screens of, for example, 15 inches or more. [0003] A conventional general direct type backlight will be described with reference to figures. Here, a case where a display unit such as a liquid crystal panel and an optical sheet are used will be described as an example. FIG. 7 is a cross-sectional view of a plane perpendicular to the long sides of the linear light sources 31 . As shown in FIG. 7, the backlight is compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357G02F1/133G02F1/1335F21V8/00F21Y103/00
CPCG02F1/133604G02F1/133606G02F1/133608
Inventor 羽生笃史
Owner NEC LCD TECH CORP
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