Surface luminous device and liquid crystal display device
A surface-emitting, light source technology, applied in lighting devices, flat/plate-shaped light guides, optics, etc., can solve the problems of whitening, reduced legibility, and insufficient brightness of illuminating liquid crystal display units.
Inactive Publication Date: 2005-05-04
ALPS ALPINE CO LTD
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Problems solved by technology
[0009] The front light 120 with the above-mentioned structure, although the distribution of the emitted light is relatively uniform, still has the problem of insufficient brightness for illuminating the liquid crystal display unit.
In addition, the light introduced into the light guide plate 112 will directly reach the viewer from the surface (top) of the light guide plate 112, causing the surface of the light guide plate 112 to appear whitish (whitening phenomenon). The problem of decreased recognition
Method used
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Embodiment Construction
[0043] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.
[0044] figure 1 It is a partial perspective view showing the structure of a front light (surface light-emitting device) according to an embodiment of the present invention. In addition, figure 2 Is from figure 1 The front lamp 10 shown is a partial perspective view of a state in which the cover member 18 is removed. The front light 10 shown in these figures has a structure including: a flat light guide plate 12 made of a transparent resin material; a side end portion (rectangular light guide plate) provided on the side end surface 12a side of the light guide plate 12 Bar-shaped strip-shaped light guide (light guide) 13 on the short side end of 12); light-emitting devices (light source) 15 and 15 provided at both ends of the strip-shaped light guide 13 in the longitudinal direction And a cover member ...
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A surface emitting device and a liquid crystal display device, wherein the front lamp (10) includes a light guide plate (12), a light guide body (13) arranged along one end surface of the light guide plate (12), and a light guide body (13) arranged on the light guide plate (12). The light-emitting device (15) at both ends of the body (13) includes a reflective surface cover subsection (18a) covering the side end portion of the reflective surface (12c) side of the light guide plate (12), covering the light guide body ( 13) the cover part (18) of the light guide body cover part (18c) and the side end part (18b) of the emission surface cover part (18b) covering the side end of the emission surface (12b) side of the light guide plate (12), set at least Covering the side ends of the light guide body (13) and the light guide plate (12), the reflective surface cover subsection (18a) is formed further forward in the light guiding direction than the emission surface cover subsection (18b) protrude. Therefore, a surface light-emitting device with high light source utilization efficiency, high brightness and good uniformity of emitted light and a liquid crystal display device using the same are realized.
Description
Technical field [0001] The present invention relates to a surface light-emitting device and a liquid crystal display device, and more particularly to a structure of a surface light-emitting device that uses more components of light emitted by a light source as illumination light. Background technique [0002] In the past, in a reflective liquid crystal display device that used ambient light as a light source for display, the brightness was affected by the amount of ambient light. Therefore, when used in a dark place, when sufficient ambient light was not available, There is a problem that the discernibility of the display is extremely reduced. Therefore, there is a liquid crystal display device of a type in which a front light (surface light-emitting device) is installed on the front side of a reflective liquid crystal display unit (liquid crystal display device) as an auxiliary light source. The liquid crystal display device having the front light operates as a normal reflective...
Claims
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IPC IPC(8): G02B6/00F21V8/00F21Y101/02G02F1/13357
CPCG02B6/0018G02B6/0028G02B6/0031G02B6/0038G02B6/0055G02B6/0068G02F1/1335
Inventor 大泉满夫杉浦琢朗
Owner ALPS ALPINE CO LTD