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. 16, 2016
Filed:
Jun. 06, 2011
Tuomas Tapani Tuikkanen, Oulu, FI;
Jeremy K. Yaeger, Santa Clara, CA (US);
Mikko Topi Loikkanen, Oulu, FI;
Tomi Juhani Koskela, Sunnyvale, CA (US);
Tuomas Tapani Tuikkanen, Oulu, FI;
Jeremy K. Yaeger, Santa Clara, CA (US);
Mikko Topi Loikkanen, Oulu, FI;
Tomi Juhani Koskela, Sunnyvale, CA (US);
NATIONAL SEMICONDUCTOR CORPORATION, Santa Clara, CA (US);
Abstract
The line banding image artifact that results from the interaction of LCD ripple and LED flicker in an LCD device that utilizes LED backlighting strings is substantially reduced by selecting a number of LED strings, individually driving the number of LED strings with a corresponding number of identical clock signals that are equally phase delayed, and selecting the frequency of the clock signals so that the product of the frequency of the clock signal multiplied by the number of LED strings is equal to the line clock frequency.