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:
Dec. 14, 1999
Filed:
Jun. 27, 1996
Shigeki Tamai, Kashihara, JP;
Yoshinori Ogawa, Yamatotakada, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
Input connection terminals of a source driver of an active matrix type liquid crystal display panel, and analog switches are reduced in number. Two of four reference voltages V0, V2, V5 and V7 are combined with each other to output, in total, three combinations (V0, V2), (V2, V5) and (V5, V7) to two reference voltage lines and in each one of three first time periods W1a, W1b and W1c. Analog switches ASW0 and ASW2 for generating voltage are interposed in the respective reference voltage lines. The analog switches are turned on and off under control based on 3-bit display data D0, D1 and D2 for 8-level gradation in second time periods W2 and W3, which are shorter than the first time period W1, within any one of the first time periods W1, whereby a vibrating voltage is supplied to the source lines. Positively utilizing a low pass filter function of the source line due to the capacity and the resistance of the source line, voltages are averaged.