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US006704061B2
(12) United States Patent ao) Patent No.: us 6,704,061 B2
Mears et al. (45) Date of Patent: Mar. 9,2004
(54) TEMPORARY SIMULATED OFF STATE IN A RESTART OF A VIDEO DISPLAY
(75) Inventors: Mark Gilmore Mears, Zionsville, IN (US); Scott Joseph Duggan, Indianapolis, IN (US); Thomas Edward Gospel, Carmel, IN (US); Gene Harlow Johnson, Carmel, IN (US)
(73) Assignee: Rhomson Licensing S.A., Boulogne (FR)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 435 days.
(21) Appl. No.: 09/891,770
(22) Filed: Jun. 26, 2001
(65) Prior Publication Data
US 2002/0085127 Al Jul. 4, 2002
Related U.S. Application Data
(60) Provisional application No. 60/259,714, filed on Jan. 4, 2001.
(51) Int. CI.7 H04N 5/63; G09G 3/36
(52) U.S. CI 348/730; 348/739; 345/102;
315/169.3
(58) Field of Search 348/730, 739,
348/744, 790, 800; 345/102; 349/61, 70;
315/169.3, 157, 158
(56) References Cited
U.S. PATENT DOCUMENTS
4,980,836 A * 12/1990 Carter et al 713/322
A liquid crystal display television receiver projection system uses a high-intensity discharge lamp as a back lighting source. The lamp is of the type that should not be re-started or turned on immediately after being turned off. In response to a user power off command, the display screen will immediately give a false appearance of being turned off, during a first interval of, for example, 30 seconds that immediately follows the power off command. Despite the appearance of being turned off, the lamp is maintained powered on, during the first interval. Should a user issue a power on command, before the first interval has elapsed, the user will not experience any start-up delay. Should the user not issue et power on command, during the first interval, the lamp will be de-energized.
9 Claims, 3 Drawing Sheets
