发明名称 |
Light emission control circuit uniformly and non-uniformly controlling a plurality of light-emitting elements |
摘要 |
A booster converter outputs a boosted voltage. A plurality of LEDs emit light of respective colors. The transistors establish or shut connection between the LEDs and a main driving circuit. A variable current circuit feeds a current to drive the LEDs. A PWM control unit effects control to cause the LEDs to emit light with respective tones of color. A PWM circuit executes PWM modulation in accordance with an instruction from the PWM control unit. A setting control unit 138 controls the magnitude of the driving current fed by the variable current circuit in accordance with an instruction from a second light emission control unit. In an image pickup mode, an additional driving circuit feeds a driving current to the LEDs so that the LEDs operate as an electronic flash.
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申请公布号 |
US2005057554(A1) |
申请公布日期 |
2005.03.17 |
申请号 |
US20040892029 |
申请日期 |
2004.07.15 |
申请人 |
YAMAMOTO ISAO;MIYANAGA KOICHI |
发明人 |
YAMAMOTO ISAO;MIYANAGA KOICHI |
分类号 |
G09G3/30;G09G3/32;G09G5/00;H01L33/00;H04M1/00;H04M1/02;H04M1/22;H05B33/08;H05B37/02;(IPC1-7):G09G3/30 |
主分类号 |
G09G3/30 |
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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