Title:
CENTER CONVERGENCE OPTIMIZATION IN A PROJECTION DISPLAY APPARATUS
Document Type and Number:
WIPO Patent Application WO2004012438
Kind Code:
A3
Abstract:
Progressive rounding error and convergence error encountered due to multiple use of a center correction adjustment (820) of an image of a video projection display is reduced by calculating a 3 x 3 matrix (770) for a moved color signal where the non center matrix values represent the difference between the initially measured sensor values (Si1,...,Si8) stored at initial alignment (720), and stored most recently measured sensor values (Sp1,...,Sp8). The matrix center value (860) is the sum of the averaged values calculated from the edge center errors, the stored sum of previous moves (MS) and the current move (CP). Rerun of the sensor finding routine (745) resets the stored move sum to zero.
Inventors:
GEORGE JOHN BARRETT (US)
BURNETT ANGELA RENEE (US)
BURNETT ANGELA RENEE (US)
Application Number:
PCT/US2003/024001
Publication Date:
March 18, 2004
Filing Date:
July 31, 2003
Export Citation:
Assignee:
THOMSON LICENSING SA (FR)
GEORGE JOHN BARRETT (US)
BURNETT ANGELA RENEE (US)
GEORGE JOHN BARRETT (US)
BURNETT ANGELA RENEE (US)
International Classes:
G03B21/00; H04N1/00; H04N9/28; H04N9/31; H04N17/00; H04N; (IPC1-7): H04N9/28
Foreign References:
| US5969756A | 1999-10-19 | |||
| US5159436A | 1992-10-27 | |||
| US6219011B1 | 2001-04-17 | |||
| US4857998A | 1989-08-15 |
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