公开(公告)号：US20040041773A1

公开(公告)日：2004-03-04

申请号：US10632713

申请日：2003-08-01

Applicant: NEC LCD TECHNOLOGIES, LTD.

Inventor： Hiroshi Takeda ,  Youji Hirano

IPC: G09G003/36

CPC classification number: G09G3/3655 ,  G09G3/3614 ,  G09G2330/023

Abstract: An active matrix liquid crystal display device operates such that the polarity of a voltage on a common electrode 30 is inverted by row or by frame. A charge collection/resupply circuit includes a switch connected between the common electrode and a common voltage output buffer, a charge collection capacitor, and a switch connected between a connection point of the common electrode and the switch and the charge collection capacitor. The switch control unit is configured to operate such that immediately before a polarity of a common voltage VCOM10 is inverted, the switch 11 is turned off and then the switch 12 is turned on, and further, after inversion of the polarity of the common voltage VCOM, the switch is turned off and then the switch is turned on.

Abstract translation: 有源矩阵液晶显示装置以公共电极30上的电压的极性逐行或反转地进行工作。 电荷收集/补充电路包括连接在公共电极和公共电压输出缓冲器之间的开关，电荷收集电容器和连接在公共电极的连接点与开关和电荷收集电容器之间的开关。 开关控制单元被配置为使得在公共电压VCOM10的极性反转之前紧接着开关11断开，然后开关12导通，此外，在公共电压VCOM的极性反转之后 ，开关关闭，然后开关打开。

公开(公告)号：US20040212577A1

公开(公告)日：2004-10-28

申请号：US10829177

申请日：2004-04-22

Applicant: NEC LCD TECHNOLOGIES, LTD

Inventor： Hiroshi Takeda ,  Machihiko Yamaguchi

IPC: G09G003/36

CPC classification number: G09G3/3648 ,  G09G2310/02 ,  G09G2320/0223

Abstract: In a liquid crystal display apparatus, a set of write-in voltages are generated corresponding to a horizontal line signal of an input video frame so that they appear at end points of the column lines of a LCD panel. The row lines of the LCD panel are successively selected and the write-in voltages are supplied from the end points of the column lines to the liquid crystal cells of the selected row line for a variable write-in period. In order to compensate for shades-of-gray differences between the top and bottom of the LCD panel, the write-in period is increasingly varied as a function of the geometric distance from the selected row line to the end points of the column lines. The write-in period may be increasingly variable from a nominal value, or from a less-than-nominal value to the nominal value, or a combination of both.

Abstract translation: 在液晶显示装置中，对应于输入视频帧的水平线信号产生一组写入电压，使得它们出现在LCD面板的列线的端点处。 连续选择LCD面板的行线，并将写入电压从列线的端点供给到所选行行的液晶单元，用于可变写入周期。 为了补偿LCD面板的顶部和底部之间的灰度差异，写入周期随着从所选行线到列线的端点的几何距离的函数而变化。 写入周期可能从标称值或从小于标称值到标称值或两者的组合变得越来越大。