公开(公告)号：US06963323B2

公开(公告)日：2005-11-08

申请号：US10156581

申请日：2002-05-24

申请人： Takaaki Sakurai ,  Yoshiteru Watanabe ,  Toshiyuki Yana ,  Satoshi Karube

发明人： Takaaki Sakurai ,  Yoshiteru Watanabe ,  Toshiyuki Yana ,  Satoshi Karube

IPC分类号： G02F1/133 ,  G09G3/20 ,  G09G3/36 ,  H02M3/155

CPC分类号： G09G3/3696 ,  G09G2330/02

摘要： A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.

摘要翻译： 提供一种液晶电源，其通过使用低精度基准电压产生电路产生提供给驱动电路的高精度驱动电源电压。 电源电路包括DC / DC转换器，其产生具有来自电源电压的振荡信号的尺寸的电压，并将所产生的电压作为驱动电源电压输出; 稳定电源电路，其产生用于在驱动电路中产生灰度电压的最高电平参考电位; 比较单元，其根据驱动电源电压和最高电平参考电位之间的差输出差分电压; 内部参考电压产生单元; 误差放大单元，放大参考电压和差分电压之间的差; 以及PWM转换单元，其响应于放大的差值输出振荡信号。