发明授权
- 专利标题： Liquid crystal display device, and light source driving circuit and method to be used in same
- 专利标题（中）： 液晶显示装置以及光源驱动电路及其使用方法
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申请号： US11118432申请日： 2005-05-02
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公开(公告)号： US07489295B2公开(公告)日： 2009-02-10
- 发明人: Nobuaki Honbo
- 申请人： Nobuaki Honbo
- 申请人地址： JP Kawasaki-Shi
- 专利权人： NEC LCD Technologies, Ltd.
- 当前专利权人： NEC LCD Technologies, Ltd.
- 当前专利权人地址： JP Kawasaki-Shi
- 代理机构： Young & Thompson
- 优先权： JP2004-136331 20040430
- 主分类号： G09G3/36
- IPC分类号： G09G3/36
摘要：
A liquid crystal display device is provided which is capable of preventing flicker or fringes in a display screen occurring even when changes in frequencies of a vertical sync signal and horizontal sync signal contained in a video signal input to the liquid crystal display device occur. A frequency detecting circuit sets a frequency of a driving pulse voltage at a value in the vicinity of “positive integer+½” times of the frequency of the horizontal sync signal and a pulse frequency for PWM (Pulse Width Modulation) light control at a value in the vicinity of a positive integral multiple or “positive integer+½” times of the vertical sync signal and a resonant frequency at a value in the vicinity of the frequency of the driving pulse voltage by adjusting capacitance value of a resonant capacitor.
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