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:
Jul. 25, 1989
Filed:
May. 26, 1988
Keith H Nicholas, Reigate, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a matrix display device, such as an LCD-TV, supply of data signals to each one of an array of display elements is controlled by respective switching devices circuits in response to applied switching signals. Each switching device circuit is fault-tolerant and has two branches each containing two series-connected transistors, e.g. TFTs, and connected in parallel between a data signal input and a display element electrode with the transistor gates being connected to a common switching signal input. For commonly-occuring transistor defects such a circuit can tolerate a defective transistor, thereby improving fabrication yields. Further transistor defects are accommodated for improved fault tolerance by provision of impedances (38) in the gate supply lines. The impedance may be resistors or active loads (41).