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    • 1. 发明授权
    • Method and apparatus for driving a liquid crystal display panel
    • 用于驱动液晶显示面板的方法和装置
    • US5307084A
    • 1994-04-26
    • US863379
    • 1992-04-03
    • Hisashi YamaguchiYoshiya KanekoMunehiro HaraguchiHiroshi MurakamiTakayuki HoshiyaTetsuya KobayashiKazuhiro Takahara
    • Hisashi YamaguchiYoshiya KanekoMunehiro HaraguchiHiroshi MurakamiTakayuki HoshiyaTetsuya KobayashiKazuhiro Takahara
    • G09G3/36
    • G09G3/3696G09G3/3622G09G2320/0209
    • In a driver circuit of direct drive matrix type LCD panel, a quantity of ON-STATE cells (or OFF-STATE cells) displayed on the just previous scan electrode is counted and a quantity of ON-STATE cells (or OFF-STATE cells) to be displayed on a present scan electrode is also counted. A compensation voltage is generated according to a predetermined relation based on a difference of the two above-counted quantities, and is superposed onto drive voltages of unselected scan electrodes or of each of data electrodes, in a polarity that an undesirable spike voltage induced on unselected cell voltage is cancelled, in synchronization with selection of the present scan electrode. The compensation voltage may be generated according to a digital difference of the two quantities or to a change in an analog voltage representing the counted quantity. The above-described relation of the compensation voltage versus the counted quantity difference may be proportional or may be given with a predetermined specific relation to meet the panel characteristics. The compensation voltage may be a flat voltage during the period for selecting the single scan electrode or may be of a spike waveform. Amplitude of this spike is determined by the above-described predetermined relation. An irregular panel brightness caused from spike voltages induced from data electrode voltage application is cancelled.
    • 在直接驱动矩阵型LCD面板的驱动电路中,对刚刚扫描电极上显示的一定数量的ON状态单元(或OFF状态单元)进行计数,并将ON状态单元(或OFF-STATE单元) 也显示在当前扫描电极上。 基于两个上述计数量的差异,根据预定关系产生补偿电压,并以非选择的扫描电极或每个数据电极的驱动电压叠加在非选择的不期望的尖峰电压的极性 与当前扫描电极的选择同步地消除电池电压。 补偿电压可以根据两个数量的数字差或与表示计数量的模拟电压的变化产生。 补偿电压与计数量差的上述关系可以是成比例的或者可以以预定的特定关系给出以满足面板特性。 在用于选择单个扫描电极的周期期间,补偿电压可以是平坦的电压,或者可以是尖峰波形。 该尖峰的幅度由上述预定关系决定。 由数据电极电压施加引起的尖峰电压导致的不规则面板亮度被取消。
    • 3. 发明授权
    • Method and apparatus for driving liquid crystal display panel
    • 驱动液晶显示面板的方法和装置
    • US06753841B2
    • 2004-06-22
    • US09250575
    • 1999-02-16
    • Tsutomu KaiYoshiya Kaneko
    • Tsutomu KaiYoshiya Kaneko
    • G09G336
    • G09G5/005G09G3/3648G09G3/3677G09G3/3688G09G5/006G09G2340/0414
    • An LCD apparatus has a control circuit 40 which makes a timing of the rear edges of scanning pulses provided to predetermined scanning lines coincide with the time when the display potential is renewed, wherein each of the predetermined scanning lines corresponds to an addition of a picture line to a picture or a reduction from two picture lines to one picture line on a picture in order to compensate for a difference between the number of scanning lines of the LCD and the number of lines of the picture to be displayed. In the control circuit, a circuit detects cycle times of the vertical and horizontal sync pulses, an MPU determines the reference value REF on the basis of the detected value and count CH of the horizontal sync pulse *HS from a counter, and a circuit generates a signal AE which makes the time when the pulse count CD of pixel clock CLKD from the counter becomes equal to the REF that coincides with the timing of the rear edge of scanning pulse.
    • LCD装置具有控制电路40,其使提供给预定扫描线的扫描脉冲的后沿的定时与更新显示电位的时间一致,其中每个预定扫描线对应于图像行的相加 以图像或从图像的两个图像行减少到图像上的一个图像行,以便补偿LCD的扫描行数与要显示的图像的行数之间的差异。 在控制电路中,电路检测垂直和水平同步脉冲的周期时间,MPU根据来自计数器的水平同步脉冲* HS的检测值和计数CH确定参考值REF,并且电路产生 使得来自计数器的像素时钟CLKD的脉冲计数CD的时间等于与扫描脉冲的后沿的定时一致的REF的时间的信号AE。