Liquid-crystal display device

Abstract

Abstract PURPOSE:To reduce the unevenness of display remarkably by varying at least the wave form of either a scanning voltage or a signal voltage in accordance with the pattern of a graphic or a character to be displayed by a display device. CONSTITUTION:When a scanning electrode is selected, a data signal 103 is fetched by a correcting circuit 104 and the number of lighted dots Mon on a scanning electrode selected next is counted. Next, a difference from the number of lighted dots Non on the scanning electrode currently selected, that is, a numeric value '1', is computed. When selection moves, the code and the absolute value of that result are outputted as a code signal 108 and an intensity signal 109 respectively. At the same time, the Mon is fetched and stored as the number of lighted dots Non on a scanning electrode currently selected. Then, necessary correction is performed on the voltage of a Y power supply 106 by a power supply circuit 105 in accordance with the code 108 and the intensity signal 109. As a result, the unevenness of display caused by scan missing every another line on a liquid-crystal panel can be prevented.

Inventors

• 👤 Katsunori Yamazaki
• 👤 克則 山崎
• 👤 Mitsuo Nagata
• 👤 永田　光夫

Bibliographic Details