Metrolex IP Law Group, PLLC
Light guide plate, planar light source apparatus, display apparatus, and electronic device
To provide a technique for suppressing brightness non-uniformity of an area illuminated by a light source and also suppressing a decline in contrast between areas caused by incidence of a luminous flux of the area to another area. Provided is a light guide plate including: a diverging portion which is provided on an opposite side of a light exit surface from which light is emitted, the diverging portion causing a luminous flux emitted from a light emitting element to diverge; and a restricting portion which is provided, when a prescribed range from the light emitting element on the light exit surface is defined as an illuminated area illuminated by the light emitting element, in at least a periphery of the illuminated area on the light exit surface and which deflects or shields light traveling from inside toward outside of the illuminated area to restrict traveling, toward a side of the light exit surface, of light traveling toward the outside of the illuminated area.
NICHIA CORPORATION
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G02B G02F F21S G02F G02B G02B G02F G02F
inventional inventional inventional inventional inventional inventional additional inventional
Tomokazu Shotaro Yoshinori Naoki
Shimoda Watanabe Ito Ishimi