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. 01, 2011
Filed:
Jan. 12, 2007
Hendrik Santo, San Jose, CA (US);
Dilip Sangam, Saratoga, CA (US);
Gurjit Thandi, San Jose, CA (US);
Kien Vi, Palo Alto, CA (US);
Hendrik Santo, San Jose, CA (US);
Dilip Sangam, Saratoga, CA (US);
Gurjit Thandi, San Jose, CA (US);
Kien Vi, Palo Alto, CA (US);
Atmel Corporation, San Jose, CA (US);
Abstract
The present invention provides a controller for controlling strings of LEDs in a liquid crystal display. The hybrid controller uses both analog and digital circuit components. Error amplifiers are used to compare analog feedback signals received from the LED strings with reference signals. The results of those comparisons are converted to digital data and processed by a digital signal processor (DSP). The DSP calculates the drive voltages for the LED strings based on the deviation between the actual current flows (represented by feedback signals) and the desired current flows (represented by reference signals) through the LED strings. Analog drivers provide the drive voltages to the LED strings.