Surface light-emitting device having light-guide panel wherein light radiated from exit surface is maximized proximate to normal direction of exit surface
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United States of America Patent
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Oct 19, 2004
Grant Date -
Feb 6, 2003
app pub date -
Jul 23, 2002
filing date -
Jul 27, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A liquid crystal display device includes a surface light-emitting device. The surface light-emitting device includes a light source and a light guide panel having a light incident surface provided on an end surface thereof for introducing light from the light source and an exit surface from which the light is radiated. The light guide panel includes a reflecting surface which faces the exit surface and which is provided with a plurality of grooves formed sequentially in a stripe pattern, each of the grooves having a gentle slope and a steep slope whose slope angle is steeper than that of the gentle slope. The direction in which the amount of light radiated from the exit surface of the light guide panel is maximized defines an angle of 1.degree. to 10.degree. with respect to the normal line of the exit surface.
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