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:
Apr. 01, 1997
Filed:
Jul. 09, 1996
Sei Saitoh, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a driving circuit for a multiple gray scale liquid crystal device, the least significant half of a given image data is decoded by a sub decoder, and one interpolating voltage is selected from a plurality of interpolating voltages by a sub switch circuit in accordance with the decoded result, so that the selected interpolating voltage Vc is applied across a capacitor. Next, the most significant half of the given image data is decoded by a main decoder, and one main voltage is selected from a plurality of main voltages by a main switch circuit in accordance with the decoded result, so that the selected main voltage Vk is supplied to one terminal of the capacitor. With this, a voltage V.sub.CH at the other terminal of the capacitor becomes {Vc+Vk}. Accordingly, by selecting Vc and Vk, it is possible to generate a number of output driving voltages corresponding to a number of gray scale levels, with a reduced number of external voltage supplies and with a reduced cost.