Guide plate, surface light source device of side light type and liquid crystal display
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United States of America Patent
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May 27, 2003
Grant Date -
N/A
app pub date -
Jul 16, 1999
filing date -
Jul 17, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A guide plate having an emission face for light-output, a back face and an incidence end face for light-input is improved. The emission face is provided with a plurality of projections each of which includes a blunt top portion. The projections have shapes such as like domes or like ridges. Each dome-like projection has a diameter ranging, for example, from 50 .mu.m to 200 .mu.m and has a height ranging, for example, from 0.1 .mu.m to 50 .mu.m. The dome-like projections distribute with density such that one or more projections are allocated, for example, per box of 0.5 mm.times.0.5 mm. Ridge-like projections run so as to have a crossing angle, for example, 60 degrees or more with respect to the incidence end face. Ratio of repetition pitch of the ridge-like projections to their height falls within a range, for example, from 5000:1 to 1:1. Height of each ridge-like projection may fall within a range from 1 .mu.m to 100 .mu.m. The emission face may be further provided with light scattering pattern consisting of a plurality of scattering elements to scatter illumination light. The improved guide plate is employed in a surface light source device of side light type. The surface light source device may be applied to a LCD having a LCD panel, which is illuminated by the light source device.
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