Illumination device for plane display device

A flat-panel display and lighting device technology, applied in lighting devices, lighting and heating equipment, plane/plate light guides, etc., can solve problems such as uneven brightness distribution and intensity distribution

Inactive Publication Date: 2004-01-07
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the brightness distribution and intensity distribution of light are not uniform

Method used

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  • Illumination device for plane display device
  • Illumination device for plane display device
  • Illumination device for plane display device

Examples

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Embodiment Construction

[0035] refer to Figure 5 , in the flat panel display lighting device according to the first embodiment of the present invention, the point light sources 11 are arranged on one side of the light guide plate 13, and the hologram 15 is formed on the bottom surface of the light guide plate 13. The first air lens 10 is disposed in the light guide plate 13 close to the point light source 11 . The hologram sheet 15 can make the brightness distribution and the light intensity distribution of light emitted by the light guide plate 13 uniform, and is provided on the upper surface of the light guide plate 13 . On the top or bottom of the light guide plate 13 , instead of the hologram 15 , an optical device capable of realizing diffraction, such as mechanical unevenness, may be provided. Alternatively, the optical device may not be arranged on the light guide plate 13 .

[0036] LEDs and LDs are used as point light sources 11 . In order to illuminate a flat panel display such as an LC...

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PUM

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Abstract

An illumination apparatus for planar display devices, including an optical element for making light travel parallel to an optical axis, is provided. The illumination apparatus includes a dot light source for radiating light, and a light guide plate having the optical element. The optical element is composed of a first refraction facet, which is adjacent to the dot light source and increases the emission angle of the light, and a second refraction facet, which is isolated a predetermined distance from the first refraction facet while facing the first refraction facet and reduces the emission angle of the light. In this structure, the light travels parallel to the optical axis In the illumination apparatus, the emission angle of incident light is reduced, preferably, the light travels parallel to the optical axis. Therefore, areas not reached by light, between adjacent dot light sources, are eliminated, and light is uniformly incident upon a hologram so that the luminance and intensity of light emitted from the light guide plate are uniformly distributed.

Description

technical field [0001] The present invention relates to the field of illuminating devices for flat-panel displays, in particular to an illuminating device for flat-panel displays. The illuminating device makes the incident light propagate parallel to the optical axis by reducing the emission angle of the incident light. Background technique [0002] In general, a flat panel display such as a liquid crystal display requires an illumination device to uniformly illuminate the liquid crystal. [0003] figure 1 is a perspective view of a conventional lighting device for a flat panel display including a light guide plate using a hologram. figure 1 The illuminating device uses a point light source such as a laser emitting diode (LED) 41 . [0004] refer to figure 1 , a plurality of LEDs 41 are arranged on one side of the light guide plate 43 , and light emitted from the LEDs 41 is scattered and propagated within the light guide plate 43 at a predetermined angle. Since the light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00F21V8/00F21Y101/02G02F1/13357
CPCG02B6/0068G02B6/002G02F1/1335
Inventor 崔振承崔桓荣闵池泓李水美金镇焕李文圭
Owner SAMSUNG DISPLAY CO LTD
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