US Patent 7441907 Light source driving method

Patent 7441907 was granted and assigned to Coretronic on October, 2008 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Coretronic

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7441907

Date of Patent

October 28, 2008

Patent Application Number

11780491

Date Filed

July 20, 2007

Patent Primary Examiner

Patent abstract

A light source driving method for controlling a first and a second light source assembly of a projection apparatus to turn on and off at least once during each 1/n frame time is provided. The first light source assembly includes first color light sources and third color light sources, while the second light source assembly includes second color light sources. The light source driving method includes following steps: turning on and off the first color light sources once sequentially in a first sub-frame period; turning on and off a part of the second color light sources once synchronously in a second sub-frame period; turning on and off the other second color light sources once synchronously in a third sub-frame period; and turning on and off the third color light sources once sequentially in a fourth sub-frame period.