发明名称 |
Power supply circuit of display device and display device using the same |
摘要 |
Provided are a power supply circuit and a display device which are capable of enhancing power efficiency even when applied to a display panel whose current consumption varies. The power supply circuit boosts and outputs an input voltage using a booster chopper circuit. A frequency control circuit changes a frequency of a clock signal, which controls a switch of the chopper circuit, in accordance with a load of the power supply circuit. The frequency control circuit divides an operation of the display device into a display effective period at a high load and a vertical retrace period at a low load, based on a vertical synchronizing signal and a horizontal synchronizing signal. The frequency control circuit sets the frequency of the clock signal in a high-load period to be higher than that in a low-load period.
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申请公布号 |
EP2194636(A1) |
申请公布日期 |
2010.06.09 |
申请号 |
EP20090176844 |
申请日期 |
2009.11.24 |
申请人 |
HITACHI DISPLAYS, LTD. |
发明人 |
KASAI, NARUHIKO;ERIGUCHI, TAKUYA;OKADA, YUKI;GOTO, MITSURU;KOTANI, YOSHIHIRO;TAKADA, NAOKI |
分类号 |
H02M3/156;G09G3/36 |
主分类号 |
H02M3/156 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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