Liquid crystal display device and lightguide having local-area and wide-area line-shaped protrusions on the lightguide emission face
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United States of America Patent
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Nov 12, 2013
Grant Date -
May 24, 2012
app pub date -
Nov 16, 2011
filing date -
Nov 22, 2010
priority date (Note) -
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Abstract
A lightguide to be used in a liquid crystal display device includes a light exit surface, a reflection surface opposed to the light exit surface, and a light entrance surface, which is one side surface. In a region of the light exit surface or the reflection surface, which is on a front side of an intermediate portion between two light sources when viewed from the light entrance surface, a plurality of local-area line-shaped protrusions are arranged, which are extending in a first direction. Each of the local-area line-shaped protrusions reflects the entered light so that a component of the entered light which is orthogonal to the first direction is weakened. A length of a local-area line-shaped protrusion farthest from the two adjacent light sources, is larger than a length of a local-area line-shaped protrusion closest to any one of the two adjacent light sources.
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