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 -
Dec 22, 1999
filing date -
Dec 28, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A guide plate has a major face on which projections are arranged, wherein the projections have an arch-like profile within the vicinity of an incidence end face, or, in addition to this, within regions along both side end faces, thereby preventing the guide plate from producing abnormal brightness which could be caused by reflective appearance of edges. A primary light source is disposed beside the guide plate. Major faces of the guide plate provide an emission face and a back face. A prism sheet and a protection sheet are disposed along the emission face. A liquid crystal display panel is additionally arranged to provide a liquid crystal display. The guide plate has a wedge-shaped cross section and a minor face at its thicker end provides the incidence end face along the primary light source. The emission face may be provided with light scattering pattern to promote emission. The projections may have a profile variation such as changing gradually from being arc-like to being triangular via transitive according to distance from the incidence end face and from side edges.
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