| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid crystal display system capable of suppressing its power consumption without lowering quality of a liquid crystal display and to provide a power supply method. SOLUTION: Power supply voltages dominated by negative loads are impedance-converted by P-type operational amplifiers 76, 77; a power supply voltage dominated by a positive load is impedance-converted by N-type operational amplifier 80; and power supply voltages equally dominated by positive and negative loads are impedance-converted by P-N change-over type operational amplifiers 78, 79. The power supply part supplies a group of power supply voltages of a same polarity V11, VC1, V12, having a narrow range of voltages to signal drivers, and supplies a group of power supply voltages of a same polarity V10, VC2, V15, having a wide range of voltages to scanning drivers. And, center voltages VC1, VC2 are equalized.
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