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. 04, 1998
Filed:
Oct. 16, 1996
Frank Robert Libsch, White Plains, NY (US);
Eugene Stewart Schlig, Somers, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An active matrix liquid crystal display (AMLCD) and driving method is disclosed. The AMLCD has matrix-arranged pixel assemblies each having display electrodes. A gate line for carrying gate line pulses is connected to a control port of a row of semiconductor devices, which may be thin film transistors (TFTs). Each TFT has an output port connected to the display electrodes. In addition, a data line is connected to an input port of a column of the TFTs. A bootstrap line is capacitively connected to the display electrodes of adjacent rows. This reduce the number of bootstrap lines to half the number of gate and data lines. A bootstrap pulse timing and generating circuit is connected to the bootstrap line to provide a bootstrap pulse that shifts voltages on the display electrodes in only one direction. The bootstrap pulse has a first edge of a first polarity occurring before or during gate pulses carried on a gate line, and a second edge of a second polarity occurring after the gate line pulses.