发明名称 |
Method and apparatus for driving a liquid crystal display panel. |
摘要 |
<p>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.</p> |
申请公布号 |
EP0374845(A2) |
申请公布日期 |
1990.06.27 |
申请号 |
EP19890123476 |
申请日期 |
1989.12.19 |
申请人 |
FUJITSU LIMITED |
发明人 |
YAMAGUCHI, HISASHI;KANEKO, YOSHIYA;HARAGUCHI, MUNEHIRO;MURAKAMI, HIROSHI;HOSHIYA, TAKAYUKI;KOBAYASHI, TETSUYA;TAKAHARA, KAZUHIRO |
分类号 |
G09G3/36 |
主分类号 |
G09G3/36 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|