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Illuminating device and liquid crystal display

By adopting a directional luminescent layer and a diffusion layer structure in the direct lighting device of the liquid crystal display, the different luminous directions of multiple light sources are used to compensate for each other's dead zones, thus solving the problems of large thickness and poor brightness uniformity of the direct lighting device, and achieving a thin Optimized and efficient lighting effects.

Inactive Publication Date: 2009-07-08
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of the current direct lighting device is about 20 mm to 40 mm, which constitutes an obstacle to the further thinning of the display
[0005] In order to further reduce the thickness of a large LCD, it is enough to shorten the distance between the light source and the LCD panel, but in this case, if the number of light sources is not increased, the brightness uniformity of the lighting device cannot be obtained
On the other hand, increasing the number of light sources increases the cost

Method used

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Examples

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Comparison scheme
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Embodiment Construction

[0054] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples.

[0055] In this embodiment, according to Figure 1 to Figure 8 A lighting device used as a backlight unit of a liquid crystal display device will be described.

[0056] figure 1 The liquid crystal display device 1 according to this embodiment is shown in . The liquid crystal display device 1 includes a backlight assembly 2 (illumination device) and a liquid crystal display panel 3 . The structure of the liquid crystal display panel 3 is the same as that of a common liquid crystal display panel used in a conventional liquid crystal display device, and thus its description is omitted. The structure of the ba...

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PUM

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Abstract

Disclosed is a liquid crystal display (1) comprising a display panel (3) and a backlight (illuminating device) (2). The backlight (2) comprises a light-emitting layer (20) wherein a plurality of light sources (5) are scattered about, and a diffusion plate (diffusion layer) (7) arranged on the light-emitting layer for diffusing the light from the light-emitting layer. The light sources (5) in the light-emitting layer (20) emit light in a direction generally parallel to the interface between the light-emitting layer (20) and the diffusion plate (7) (in the direction of the arrow). In the diffusion plate (7), the light transmittance in a region (7c) closer to the light sources is lower than the light transmittance in a region more distant from the light sources.

Description

technical field [0001] The present invention relates to a lighting device used as a backlight assembly or the like of a liquid crystal display device and a liquid crystal display device including the lighting device. Background technique [0002] In recent years, liquid crystal display devices that have been rapidly popularized instead of cathode ray tubes (CRTs) are widely used in liquid crystal televisions, monitors, mobile phones, etc., due to their advantages of energy saving, thinness, and light weight. As a method for further utilizing these advantages, improvement of an illuminating device (so-called backlight unit) arranged behind a liquid crystal display device can be mentioned. [0003] Illumination devices are roughly divided into side-light type (also referred to as edge-light type) and direct-light type. The side-light type has the following structure: a light guide is arranged behind the liquid crystal display panel and a light source is arranged at the side e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21V3/04G02B5/02G02F1/13357F21Y101/02
CPCG02B5/0278G02F1/133611G02F1/133603G02B6/0068G02F2001/133613G02B5/0242G02B6/0073G02B6/0021G02F1/133613
Owner SHARP KK
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