Liquid crystal display device and power supply circuit
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United States of America Patent
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Nov 15, 2011
Grant Date -
Apr 10, 2008
app pub date -
Sep 28, 2007
filing date -
Oct 10, 2006
priority date (Note) -
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Abstract
A size of a power supply circuit in a liquid crystal display device is reduced while an efficiency of the circuit is improved. The power supply circuit is formed on a TFT substrate of a liquid crystal panel and its output is provided to a vertical drive circuit. The power supply circuit is composed of a DC-DC converter that generates a positive power supply electric potential and a DC-DC converter that generates a negative power supply electric potential. The DC-DC converters are driven by a common electrode signal VCOM. The DC-DC converter that generates the positive power supply electric potential outputs VCOMH×2, and the DC-DC converter that generates the negative power supply electric potential outputs VCOMH×(−1). Thus electric potentials which are suitable to turn pixel transistors on and off are made available.
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