Surface emitting device
A surface-emitting, end-face technology, which is applied in lighting devices, fixed lighting devices, flat/plate-shaped light guides, etc., can solve the problems of reduced light incident efficiency, low brightness, and difficulty in light incident light, so as to improve light incident efficiency and improve The effect of uniformity
Inactive Publication Date: 2010-11-24
ALPS ALPINE CO LTD
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Problems solved by technology
In the case of using such a film light guide plate, it is very difficult to efficiently enter the light from the light source
In addition, when the surface light-emitting device is mounted on a circuit board such as a flexible wiring board, a gap is generated between the LED as a point light source and the film light guide plate, and the light incident efficiency is further reduced due to the gap.
And, as the light source of the surface light-emitting device, it is more and more inclined to use LED as a point light source. When such a point light source is used, the light cannot efficiently propagate in the entire film light guide plate, and the brightness becomes lower.
Method used
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[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0028] figure 1 (a) and (b) are figures which show the structure of the light guide which is the surface light-emitting device which concerns on embodiment of this invention. figure 1 The light guide shown in (a) is mainly composed of a point light source 20 mounted on the circuit board 10, a reflector 30 mounted on the circuit board 10, a film light guide plate 40 arranged above the reflector 30, and a film light guide plate 40 arranged on the film. The member 50 for expanding the light incident portion on the end face side of the light guide plate 40 is constituted.
[0029] A commonly used printed wiring board, flexible printed wiring board, or the like can be used as the circuit board 10 . As the point light source 20, LED (Light Emitting Diode) etc. can be mentioned. The reflector 30 is a thin plate made of a reflective material.
[0030] The film lig...
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The invention provides a thin surface emitting device for improving a light incidence efficiency of a light guiding component even a light source is separated from the light guiding component. The surface emitting device of the invention is characterized by comprising at least a point light source (20), a thin film light guiding plate (40) having a pair of opposite main surfaces (41, 42) and an end surface (43) injecting the light from the light source (20), one main surface is provided with a microprism (44); and an incidence light expanding component (50) arranged on one end surface side of the other main surface of the thin film light guiding plate (40) composed by transmissive light material.
Description
technical field [0001] The present invention relates to a surface light-emitting device, and relates to a thin-shaped surface light-emitting device that improves light incident efficiency of a light guide member. Background technique [0002] Conventionally, surface light-emitting devices for illuminating liquid crystal display panels, such as backlights and front lights, are known as illumination means for display devices, mainly liquid crystal display devices. A conventional surface-emitting device is generally mainly composed of a light source and a light guide plate for emitting light from the light source to a liquid crystal display panel. In recent years, the thinning of surface light-emitting devices has progressed, and surface light-emitting devices using light guide plates thinner than light sources have been developed. [0003] As such a thin surface-emitting device, there is a device having the configuration disclosed in Patent Document 1. The surface light-emit...
Claims
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IPC IPC(8): F21S8/00F21V13/00
CPCG02B6/0018G02B6/0036G02F1/133528
Inventor 片山胜行永久保秀明木村武顺山本孝一佐藤奈绪美
Owner ALPS ALPINE CO LTD