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    Power supply circuit of display device and display device using the same
    2.
    发明公开
    Power supply circuit of display device and display device using the same 有权
    StromversorgungsschaltungfürAnzeigevorrichtung und Anzeigevorrichtung damit

    公开(公告)号：EP2194636A1

    公开(公告)日：2010-06-09

    申请号：EP09176844.0

    申请日：2009-11-24

    申请人： Hitachi Displays, Ltd.

    发明人： Kasai, Naruhiko ,  Eriguchi, Takuya ,  Okada, Yuki ,  Goto, Mitsuru ,  Kotani, Yoshihiro ,  Takada, Naoki

    IPC分类号： H02M3/156 ,  G09G3/36

    CPC分类号： G09G3/3696 ,  G09G2330/02 ,  G09G2330/021 ,  H02M3/07 ,  H02M3/156 ,  H02M2001/0032 ,  Y02B70/16

    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.

    摘要翻译： 提供了即使在电流消耗变化的显示面板上也能够提高功率效率的电源电路和显示装置。 电源电路使用升压斩波电路升压输出电压。 频率控制电路根据电源电路的负载改变控制斩波电路的开关的时钟信号的频率。 频率控制电路基于垂直同步信号和水平同步信号，在低负载下将显示装置的操作分割为高负载和垂直回扫周期的显示有效期间。 频率控制电路将时钟信号的频率设定为高于低负载时段的频率。