发明申请
US20100033458A1 Buffer circuit having voltage switching function, and liquid crystal display device
审中-公开
具有电压切换功能的缓冲电路和液晶显示装置
- 专利标题： Buffer circuit having voltage switching function, and liquid crystal display device
- 专利标题（中）： 具有电压切换功能的缓冲电路和液晶显示装置
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申请号： US12311978申请日： 2007-07-05
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公开(公告)号： US20100033458A1公开(公告)日： 2010-02-11
- 发明人: Shinsaku Shimizu , Kazuhiro Maeda , Ichiro Shiraki
- 申请人： Shinsaku Shimizu , Kazuhiro Maeda , Ichiro Shiraki
- 申请人地址： JP OSAKA-SHI
- 专利权人： SHARP KABUSHIKI KAISHA
- 当前专利权人： SHARP KABUSHIKI KAISHA
- 当前专利权人地址： JP OSAKA-SHI
- 优先权： JP2006-301630 20061107
- 国际申请： PCT/JP2007/063423 WO 20070705
- 主分类号： G09G5/00
- IPC分类号： G09G5/00 ; H03K17/00
摘要：
In one embodiment of the invention, a capacitor is provided between a node and a negative-side input terminal of a differential amplifier. A switch SW11 is provided between the negative-side input terminal and an output terminal of the differential amplifier. A switch SW12 is provided between the node and the output terminal of the differential amplifier. Switches SW13 to SW16 are provided for switching between a voltage of the node and a positive-side input voltage of the differential amplifier. The switches SW11 and SW12 are on during different periods. In a positive polarity mode, the switches SW13 and SW16 are when the switch SW11 is on while the switch SW16 is on when the switch SW12 is on. In a negative polarity mode, the switches SW14 and SW15 are on when the switch SW11 is on while the switch SW16 is on when the switch SW12 is on. Thus, two types of gradation voltages each required for AC drive of a liquid crystal can be generated with a small circuit scale.
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