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Surface light source and liquid crystal display including the same

By forming a concave shape and dispersing scattering particles on the incident end face of the light guide plate, the problem of uneven luminous intensity and light leakage near the incident end face of the surface light source is solved, achieving more uniform luminous intensity and efficient light use.

Inactive Publication Date: 2009-07-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the case of the surface light sources disclosed in the above-cited publications, the improvement in the uniformity of the luminous intensity is insufficient
In addition, the light leaked from the side end surface of the light guide plate is not considered
Therefore, if light leaks from this part, it causes a problem that the use efficiency of light decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027]

[0028] refer to Figure 1A and 1B , the light emitting device 100 is a light source, has a packaging form of a so-called resin molded package, and includes: a substrate 11, a chip 12 die-bonded on the substrate, and a resin 13 covering the above-mentioned components, and the fluorescent Body 14 is dispersed in resin 13 .

[0029] The chip 12 is a nitride semiconductor light-emitting device that emits primary light, which is blue light with a peak emission wavelength of about 450 nm.

[0030] The substrate 11 is formed of a high thermal conductivity material, and its purpose is to immediately dissipate the heat generated when the chip 12 is driven. Preferably, the substrate is made of a material that dissipates heat quickly, such as ceramics. In addition, the substrate includes previously formed wires or the like for powering the chip 12 .

[0031] For the resin 13, a silicone resin or the like having high resistance to primary light and secondary light is prefera...

no. 2 example

[0098] refer to Figures 9A to 9C , the liquid crystal display 400 is configured to include: a surface light source 300 and a liquid crystal display panel 51 , the liquid crystal display panel 51 is disposed directly above the surface light source, and the surface light source illuminates the panel from behind. Therefore, the liquid crystal display 400 includes the surface light source 300, thereby providing a high-quality display with less non-uniformity of luminous intensity. Especially, near the incident tangent plane 37, the non-uniformity of the luminous intensity is small. In addition, lower power consumption can be achieved.

no. 3 example

[0100] refer to Figure 10A and 10B , The present embodiment is characterized in that the light guide plate 30 is formed by a light guide plate 30a and a plurality of light guide plates 30b separated from each other by gaps, the light guide plate 30a includes a center line, and the light guide plate 30b includes an incident end surface 35a. In addition, on the incident tangent surface 37 of the light guide plate 30b, a triangular incident end surface 35a is formed instead of the incident end surface 35 having a concave arc-shaped cross section. Preferably, a reflective member 36 is included to cover the gap between the light guide plates 30a and 30b.

[0101] The propagation direction of the light emitted from the light emitting device 100 is turned by the light guide plate 30 b, and directly passes through the slit or is incident on the end surface of the light guide plate 30 a after being reflected by the reflection member 36 .

[0102] If the ambient temperature of the su...

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PUM

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Abstract

A surface light source includes a light source and an optical waveguide plate. The light source serves to emit light. The optical waveguide plate has an incident end face where the light is incident and a light exit surface where the light incident on the incident end face exits. Further, the optical waveguide plate has a refractive index n. The incident end face has a plurality of concave portions. The angle between a plane formed by the plurality of concave portions and a tangent plane of the incident end face is not more than (90-2*arcsin(1 / n)) degree.

Description

technical field [0001] The present invention relates to a display including a surface light source with a light guide plate, and a display panel whose backside is illuminated by the surface light source. Background technique [0002] As a surface light source such as a backlight that illuminates a liquid crystal display panel from behind, it is well known that a surface light source includes a light source such as an LED and a light guide plate that receives light from the light source at an incident end face of the light guide plate and then diffuses and emits it. Preferably, such a surface light source exhibits uniform luminous intensity on the entire light exit surface. However, the problem here is that the luminous intensity is not uniform in the vicinity of the incident end face. [0003] Japanese Patent Laid-Open No. 2005-071971 discloses a surface light source configured to solve the above-mentioned problems, in which a plurality of prisms are formed on an incident e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00G02F1/13357F21Y101/02
CPCG02B6/0073G02B6/0021
Owner SHARP KK
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