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:
Aug. 15, 2000
Filed:
Sep. 29, 1997
Kohei Matsuda, Shiga, JP;
NEC Corporation, Tokyo, JP;
Abstract
A driving device is for driving a liquid crystal display in accordance with a display data signal. A shift register circuit produces first through N-th control signals from first through N-th shift output terminals, respectively, in synchronism with the clock signal, where N represents a positive integer greater than one. First through N-th output circuit produces first through N-th gradation voltages in correspondence with the display data signal in synchronism with the first through the N-th control signals, respectively. An additional output circuit produces an additional gradation voltage in correspondence with the display data signal in synchronism with an additional control signal. A connecting circuit connects the additional output circuit to an n-th shift output terminal instead of an n-th output circuit when the n-th output circuit becomes faulty, where n is a variable between one and N, both of inclusive. The connecting circuit supplies the additional output circuit with an n-th control signal as the additional control signal to make the additional gradation voltage as an n-th gradation voltage.