Convergence correction system with recovery function and display

Details Convergence correction system with recovery function and display Convergence correction system with recovery function and display

1995-06-07

1999-03-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348177, 348181, 348745, 348807, 348813, H01J 2951

Patent

active

058834761

ABSTRACT:
A plurality of photo detectors are arranged outside the display screen of a projection display apparatus having a built-in digital convergence correction system and a function for adjusting data in the frame memory so as to coincide the photoelectric devices of the photo detectors with the adjustment patterns is provided. The adjusted data when the convergence on the entire screen of the display is adjusted and the adjusted data when the convergence is adjusted by the adjustment function before misconvergence is generated are memorized beforehand. When misconvergence is generated, the convergence is adjusted by the adjustment function again, and a corresponding correction value is obtained on the photo detector by calculating the adjusted data at this time and the prememorized adjusted data, and a correction value on the entire screen is obtained by executing an interpolation calculation from this correction value, and the misconvergence on the entire screen is corrected.

REFERENCES:
patent: 4857998 (1989-08-01), Tsujihara et al.
patent: 4868668 (1989-09-01), Tavernetti
patent: 5200815 (1993-04-01), Tsujihara et al.
patent: 5532765 (1996-07-01), Inoue et al.
patent: 5602932 (1997-02-01), Macdonald et al.

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