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:
Dec. 31, 2002
Filed:
Aug. 21, 1999
Mark R. Bjerke, Waukesha, WI (US);
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
A system for controlling contrast of a liquid crystal display is provided by means of a parallel network of resistors. A processor controls general operations of the system and is configured to determine a desired contrast setting of the LCD. The processor is operative to assign a binary value corresponding to the desired contrast setting. A binary decoder is operatively coupled to the processor and is configured to receive the binary value of x bits from the processor. A circuit includes N number of resistors (N being an integer greater than x) configured to be coupled in parallel to effect a plurality of cumulative parallel resistance values for the circuit. The circuit is operatively coupled to the binary decoder. The binary decoder selectively combines the resistors to effect a specific cumulative parallel resistance value corresponding to the desired contrast setting.