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    • 3. 发明申请
    • BACKLIGHT DEVICE
    • 背光装置
    • WO2008137674A3
    • 2011-07-14
    • PCT/US2008062416
    • 2008-05-02
    • TEXAS INSTRUMENTS INCTANAKA SHINICHI
    • TANAKA SHINICHI
    • G09G3/36H05B37/02
    • H05B33/0845G09G3/3406G09G3/3413G09G2320/0626G09G2330/021G09G2330/12H05B33/0818H05B33/0827
    • A backlight device that is not affected by offset voltage. Driving transistor (41) operates such that current flows in LED circuit (11), and the detection voltage generated by current detector (42) and the reference voltage are input alternately to first input transistor (30a) and second input transistor (30b) of amplifier (20). Brightness adjusting switch (43) operates such that when driving transistor is turned OFF during the OFF period of LED circuit, for example, during the horizontal blanking interval or vertical blanking interval, the detection voltage and the reference voltage are swapped, so that the average voltage generated in current detector is equal to the reference voltage, and the effect of the offset voltage can be eliminated.
    • 不受偏移电压影响的背光装置。 驱动晶体管(41)工作,使得电流在LED电路(11)中流动,并且由电流检测器(42)产生的检测电压和参考电压交替地输入到第一输入晶体管(30a)和第二输入晶体管(30b) 放大器(20)。 亮度调整开关43的动作使得在LED电路的关闭期间例如在水平消隐间隔或垂直消隐间隔期间,当驱动晶体管截止时,检测电压和参考电压被交换,使得平均 电流检测器中产生的电压等于参考电压,可以消除偏移电压的影响。