Light control element, surface light source device and liquid crystal display device
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United States of America Patent
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Nov 15, 2011
Grant Date -
Aug 20, 2009
app pub date -
Jan 17, 2008
filing date -
Jan 19, 2007
priority date (Note) -
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Abstract
A light control element capable of controlling deflection of light output through a light guide plate to a desired output viewing angle is provided. A light control element (prism sheet) has a plane of incidence on one surface thereof, and a plane of output on the other surface thereof. The plane of incidence is formed as having thereon a number of prism portions arrayed in parallel. Each of the prism portions has a first prism surface allowing incidence of light, and a second prism surface where the light entering through the first prism surface is reflected by total reflection on the inner side. The second prism surface has an outwardly-swelled curved profile, formed with a curvature that allows the light to output through the plane of output at a second output viewing angle wider than a first output viewing angle of a case where the second prism surface is flat.
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