Light source device, illumination device liquid crystal device and electronic apparatus
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United States of America Patent
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Apr 26, 2005
Grant Date -
Apr 25, 2002
app pub date -
Jul 12, 2001
filing date -
Jul 13, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A light source device 41A, 41B or 41C comprising a lens 44A, 44B or 44C which receives light from a light emitting device 43 such as LED. The lens 44A is a lens having the property that the directivity of exiting light in the Y direction is higher than the directivity in the X direction perpendicular to the Y direction. Namely, the light emitted from the light emitting device 43 is condensed in a narrow angular range in the Y direction, and is scattered in a wide angular range in the X direction. When the light source device 41A is used as a light source of an illumination device of a liquid crystal device, the height direction of a light guide in which the dimension is small coincides with the Y direction, and the width direction of the light guide in which the dimension is large coincides with the X direction.
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