Surface light source device of side light type, liquid crystal display and guide plate
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United States of America Patent
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Dec 1, 2009
Grant Date -
Dec 18, 2003
app pub date -
Jun 11, 1999
filing date -
Jun 12, 1998
priority date (Note) -
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Abstract
A surface light source device of side light type illuminating an LCD panel and comprising a guide plate, a primary light source, a reflection sheet, and a prism sheet for light control. A plurality of fine light scattering elements and rough area M are formed on an emission face of the guide plate. The rough area M is formed among the light scattering elements and has scattering power weaker than that of the light scattering elements. The dot-like light scattering elements are distributed according to a certain pattern that is designed to promote emission. Emission is promoted where the light scattering elements are formed and also in the area M. Accordingly, fine periodic bright-dark unevenness and glaring are reduced and the prism sheet, disposed on the emission face, is prevented from sticking to the emission face.
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