US 7,410,262 B2 Aug. 12, 2008
SYSTEM AND METHOD FOR
COMPENSATING FOR SPOKE LIGHT
Inventor: Brent Hoffman, Mooresville, IN (US)
Assignee: TTE Technology, Inc., Indianapolis, IN (US)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 318 days.
Filed: Aug. 2, 2005
Prior Publication Data
US 2007/0035703 Al Feb. 15, 2007
G03B 21/14 (2006.01)
G02B 5/22 (2006.01)
U.S. CI 353/84; 353/121; 348/743;
Field of Classification Search 353/84,
353/85, 69, 121, 122, 94; 348/742, 743, 348/771; 359/889, 891, 892 See application file for complete search history.
U.S. PATENT DOCUMENTS 6,285,491 Bl* 9/2001 Marshall et al 359/292
The disclosed embodiments relate to a system and method for compensating for spoke light in a video unit (10). More specifically, there is provided a method comprising measuring a first light level during a non-spoke time of a color wheel (14) to generate a non-spoke light level; and setting a spoke light compensation value based on the measured non-spoke light level. There is also provided a video unit (10) comprising a light source (12) configured to generate a first light level during a non-spoke time of a color wheel (14), a photodiode assembly (26) configured to measure the first light level to generate a non-spoke light level, and a processor (20) configured to set a spoke light compensation value based on the non-spoke light level.
20 Claims, 4 Drawing Sheets