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:
Nov. 14, 2000
Filed:
Sep. 29, 1998
Jay Friedman, Felton, CA (US);
Candescent Technologies Corporation, San Jose, CA (US);
Abstract
The present invention provides for an amplifier circuit for use within a column driver of a field emission display (FED) device. In one embodiment of the present invention, the amplifier circuit has a high slew rate and a low quiescent current, and includes: an input for receiving an input voltage signal, an output for providing an output voltage signal, a voltage sensing circuit for monitoring a voltage differential between the input voltage signal and the output voltage signal, and a current-boosting circuit responsive to the voltage differential for providing additional bias current to the voltage sensing circuit to increase the slew rate of the output voltage signal. Significantly, the current-boosting circuit is inactive when the input voltage signal and the output voltage signal are substantially equivalent. In this way, bias current and power dissipation are maintained at a low level during quiescent conditions. In furtherance of the present embodiment, the input of the amplifier circuit is configured for coupling to D/A conversion circuits of the column driver to receive the input voltage signal, and the output of the amplifier circuit is configured for coupling to a column line of the FED to drive the output voltage over the column line.