Surface light source device and backlight unit having the same
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United States of America Patent
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Issued Date -
Jun 19, 2008
app pub date -
Dec 10, 2007
filing date -
Dec 11, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is a provided a surface light source device comprising: a light source body having an inner space therein in which a discharge gas is contained; a plurality of electrodes formed on the light source body in such a manner as to electrically divide the inner space into at least three blocks and applying discharge voltages to the blocks; and a driving unit sequentially applying the discharge voltages to the blocks through the electrodes in synchronization with a video signal of an external display device. The light source body may have a plurality of discharge spaces or a single discharge space therein. In accordance with the present invention, the surface light source device sequentially applies the discharge voltages to the blocks, and thereby can reduce an after-image occurring in a liquid crystal display device. Further, the surface light source device is driven with a duty ratio varied depending on brightness of the video signal, and thereby integrated power consumption can be reduced and a contrast ratio can be improved.
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