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    • 2. 发明授权
    • Power supply apparatus used for driving liquid-crystal display and
capable of producing a plurality of electrode-driving voltages of
intermediate levels
    • 用于驱动液晶显示器并且能够产生中间电平的多个电极驱动电压的电源装置
    • US5343221A
    • 1994-08-30
    • US82429
    • 1993-06-25
    • Takashi ArakawaHiroyuki Motegi
    • Takashi ArakawaHiroyuki Motegi
    • G02F1/133G09G3/36G09G3/00
    • G09G3/3696
    • A plurality of resistors serially connected with each other between a maximum voltage level "V" and a minimum voltage level "0" are provided to generate voltage-divided intermediate voltage levels "V2H", "V1H", "V3L", "V2L", the voltages having the voltage-divided intermediate voltage levels being supplied to a first group of operational amplifiers whose first stage input portions are formed of N-channel MOSFETs and a second group of operational amplifiers whose first stage input portions are formed of P-channel MOSFETs. Frame signal FR for alternating-current-driving a liquid crystal display device is supplied to the operational amplifiers. When signal FR is in a state "0", the first group of operational amplifiers are brought into an active state while the second group is brought into an inactive state. When signal FR is in a state "1", the first group of operational amplifiers are inactive. Under the condition that power down signal PD for non-use of the liquid crystal display device is generated, all of the operational amplifiers are controlled to be in an inactive state.
    • 提供在最大电压电平“V”和最小电压电平“0”之间串联连接的多个电阻器,以产生分压中间电压电平“V2H”,“V1H”,“V3L”,“V2L” 具有分压中间电压电平的电压被提供给第一组运算放大器,其第一级输入部分由N沟道MOSFET形成,第二组运算放大器的第一级输入部分由P沟道 MOSFET。 用于将液晶显示装置进行交流驱动的帧信号FR提供给运算放大器。 当信号FR处于状态“0”时,第一组运算放大器处于活动状态,而第二组处于非活动状态。 当信号FR处于状态“1”时,第一组运算放大器是无效的。 在产生用于不使用液晶显示装置的掉电信号PD的条件下,所有的运算放大器都被控制在无效状态。