发明名称 |
PWM illumination control circuit with low visual noise for driving LED |
摘要 |
A pulse width modulation (PWM) illumination control circuit with a low visual noise for driving a light-emitting diode (LED) is provided. An illumination control pulse-generating unit is used to generate an illumination control pulse signal according to an illumination-adjusting signal. A duty cycle, a phase shift or a frequency of the illumination control pulse signal varies with time within a predetermined scope for controlling a DC/DC converter to drive the light-emitting diode so that the overall visual noise level of the PWM illumination control circuit is improved.
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申请公布号 |
US7183723(B2) |
申请公布日期 |
2007.02.27 |
申请号 |
US20040708212 |
申请日期 |
2004.02.17 |
申请人 |
BEYOND INNOVATION TECHNOLOGY CO., LTD. |
发明人 |
YU CHUNG-CHE;CHANG BOR-YUH;HUANG SHIH-CHUNG |
分类号 |
G02F1/13357;H05B41/16;G02F1/133;H05B33/08;H05B37/02;H05B41/392 |
主分类号 |
G02F1/13357 |
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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