发明名称 |
Back lighting source module for liquid crystal display |
摘要 |
A back lighting source module for a liquid crystal display comprises a pulse width modulation (PWM) controller for providing a pulse width signal to control output current of a lighting element. A half bridge converter includes two power transistors connected in series. An output is formed in a middle between the two power transistors. The output is controllable by the signal from the PWM controller to perform alternating opening and closing. A resonance circuit generates a sine-wave voltage to empower the lighting element. A feedback circuit includes a resistor. When a load varies, a voltage signal generated between two ends of the resistor of the feedback circuit timely changes a conductive time of the power transistors of the half bridge converter to complete regulation of current passing through the lighting element.
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申请公布号 |
US6531835(B2) |
申请公布日期 |
2003.03.11 |
申请号 |
US20000741683 |
申请日期 |
2000.12.18 |
申请人 |
AMBIT MICROSYSTEMS CORPORATION |
发明人 |
CHEN JASON;LIU PETER |
分类号 |
G09G3/20;G09G3/34;H05B41/282;H05B41/392;(IPC1-7):G05F1/00 |
主分类号 |
G09G3/20 |
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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