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    • 98. 发明专利
    • LIQUID CRYSTAL DISPLAY DEVICE
    • JPH0553522A
    • 1993-03-05
    • JP21572691
    • 1991-08-28
    • CASIO COMPUTER CO LTD
    • UMEZAWA TAKESHI
    • G09G3/18H05B41/00
    • PURPOSE:To lower the brightness and temp. of a back light at the time of a high temp. by controlling the voltage to be supplied to a lighting circuit for lighting the back light by temp. CONSTITUTION:The lighting circuit 16 consisting of an inverter is connected to a cathode tube 14 and a temp. compensation circuit 17 consisting of a variable output type three-terminal regulator and thermistor, etc., is connected to this lighting circuit 16. The variable output type three-terminal regulator can set an output voltage by the thermistor and since the resistance value of the thermistor has a negative temp. characteristic, the output voltage Vout changes according to a change in the ambient temp. Then, a reference voltage is outputted up to the set temp. and the output voltage Vout drops when the temp. rises higher than the set temp. The input voltage VCC IN to the lighting circuit 16 changes eventually to change the output voltage VO of the lighting circuit 16. This output voltage is supplied to the cathode tube 14. The brightness of the cathode tube 14 can, therefore, be controlled at the time of the high temp. and the generation of heat in the cathode tube 14 is suppressed. The temp. of the LCD is thus lowered.