The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 27, 2001
Filed:
Mar. 24, 1997
Seijirou Gyouten, Tenri, JP;
Yoshinori Ogawa, Yamatotakada, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In a liquid crystal display device, a segment side drive circuit supplies display data in: parallel to common electrodes Y,, Y,, Y,, selected by the common side drive circuit on the liquid crystal panel. When the distance to a liquid crystal display cell is increased, electrical resistance of the segment electrode increases and electrical capacitance of each liquid crystal cell increases. Therefore, n output voltage waveform is damped resulting in unevenness in density depending on the position. The controller supplies the segment side drive circuit with a correction clock which changes the pulse width according to the display position. The amount of correction which changes the level of an output voltage output by the segment side drive circuit to an intermediate level is adjusted according to the distance to even effective voltage values of display positions. Thereby, it is possible to eliminate a difference in density between an upper side and a lower side of the liquid crystal panel. It is also possible to adjust the amount of correction by changing the amount of change in the voltage of an intermediate level. It is also possible to make correction by inverting ON and OFF.