Surface light source device of side light type, liquid crystal display and light guide plate
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
Aug 3, 1998
filing date -
Aug 11, 1997
priority date (Note) -
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Abstract
A surface light source device of side light type 40 comprises a guide plate 42, a primary light source 3 comprising a wedge-shaped light source element 7 and a reflector 8, a reflection sheet 21, a prism sheet 41 and a light-scattering sheet 23. The guide plate 42 is wedge-shaped in cross-section and has a back surface 42B and an emission surface 42C. The emission surface 42C is a prism surface. A scattering pattern 24 is provided on the back surface 42B. The scattering pattern 24 comprises a great number of micro-dots, which are sufficiently small that they are hardly visible. Covering rate of the micro-dots is high near an incidence surface 42A, especially at the corners, thereby preventing brightness reduction in a region AR1. Irregularity of the dot arrangement avoids moare streaks caused in relation to a color filter arrangement of a liquid crystal panel.
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