Light source device, display device, and terminal device
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United States of America Patent
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Mar 12, 2013
Grant Date -
N/A
app pub date -
May 19, 2011
filing date -
Sep 30, 2005
priority date (Note) -
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Abstract
In a display device equipped with a light source device, a second light-guide member is provided to the back surface of a first light-guide member that has an emitted light control sheet provided to the front surface thereof. The emitted light control sheet is composed of a flat plate portion and protrusions. A first light source mounted to a side surface of the first light-guide member, and a second light source mounted to a side surface of a second light-guide member are switched and turned on. The emitted light control sheet has light-condensing effects when the first light source is on, and has diffusing effects when the second light source is turned on. The angle range of illuminating light can thereby be switched.
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