Area light source device
A surface light source and light source technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as no effect, no consideration of relative position, uneven brightness, etc.
Inactive Publication Date: 2007-02-07
ORMON CORPORATION
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Problems solved by technology
However, in these conventional surface light source devices, since all the light deflection patterns are uniformly bent to form the same shape regardless of the relative position of the self-light source, it is difficult to eliminate brightness unevenness when viewed from any direction. no effect
Method used
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Embodiment Construction
[0120] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (Structure of Surface Light Source Device) FIG. 8 is a perspective view showing a surface light source device 31 according to Embodiment 1 of the present invention. The light guide plate 32 is formed in a flat plate shape from a transparent material with a high refractive index such as polycarbonate resin, methacrylic resin, or glass. The end surface on the short side of the light guide plate 32 serves as a light incident surface 34 , and a light source 33 incorporating a light emitting element such as an LED is arranged at a position facing the light incident surface 34 . The front surface of the light guide plate 32 is the light exit surface 35 , and the surface opposite to the light exit surface 35 is a pattern surface on which the light deflection pattern 37 is formed. A reflection sheet 36 made of a metal plate, a white resin sheet, or the like is disposed...
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Abstract
The invention provides a surface light source device that suppresses the luminance variations as viewed from whatever direction, without causing increase in the thickness of the surface light source device. A large number of substantially arc light deflection patterns (37) are arrayed on the back (pattern) surface of a light guide plate, to produce a visual-angle-controlled even, bright and clear image. The light deflection pattern (37) in a position A with a large opening angle of light incident from a light source has a small curvature, and the light deflection pattern (37) at a position B with a smaller opening angle of light incident from the light source has a large curvature. The light deflection pattern (37) with the smaller opening angle (xi A) of light incidence, because of the larger curvature, spreads reflected light wider, to provide wider directivity characteristic of the light reflected by the light deflection pattern (37) and emitted from an emission surface of the light guide plate. The curvature of the light deflection patterns depends on the position, relative to the light source to produce a substantially uniform directional characteristic of the emitted light over the light guide plate.
Description
technical field [0001] The present invention relates to a surface light source device, and more particularly to a surface light source device used as a backlight or front light of a liquid crystal display device, a lamp capable of illuminating both sides, and the like. Background technique [0002] In recent years, with the speeding up of information communication and the development of IT, relatively small portable information terminals have rapidly penetrated into the market as consumer goods. Representatives thereof include mobile phones, PDAs, multifunctional watches, ATMs, and the like, and liquid crystal display devices are used as main devices of these portable information terminals. Among them, liquid crystal display devices for color display are the mainstream, and more high-definition, smaller, thinner, power-saving, and low-cost liquid crystal display devices are being demanded. [0003] figure 1 It is a partially cutaway exploded perspective view showing the st...
Claims
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Login to View More IPC IPC(8): G02F1/13357G02F1/1335
Inventor 中村惠子松井优贵船本昭宏青山茂樱井显治
Owner ORMON CORPORATION