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. 05, 1996
Filed:
May. 27, 1994
Roy K Tanikawa, Irvine, CA (US);
AST Research, Inc., Irvine, CA (US);
Abstract
A voltage discharge circuit discharges the voltage across a charge storage device, such as a capacitor, at an output of a power supply. The discharge circuit may be used, for example, in a contrast power supply for an LCD panel. The discharge circuit uses one or more switches to control the coupling between the output capacitor and a discharge element, such as a resistor. When the power supply is enabled, the discharge resistor is not coupled to the output capacitor, so that the discharge circuit does not significantly affect the operation of the power supply. When the power supply is disabled, the switches couple the discharge resistor to the output capacitor to discharge any accumulated voltage at a relatively fast rate. For a contrast power supply for an LCD display, a switching power supply is preferred.