Digital convergence correcting apparatus

Details Digital convergence correcting apparatus Digital convergence correcting apparatus

1989-01-27

1990-12-11

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, 315368, H04N 928

Patent

active

049774468

ABSTRACT:
A convergence correcting apparatus is used in a projection television receiver including a CRT having an aspherical fluorescent screen and a projection lens apparatus which is attached to the display screen of the CRT and has aspherical plastic lenses. In the digital convergence correcting apparatus, a digital memory stores digital correction data corresponding to correction values of convergence adjustments points indicative of a plurality of points on the display screens divided in the horizontal and vertical directions. A multiplexer reads out predetermined digital correction data from the digital memory and time sharingly multiplexes. At least one digital/analog converter receives the time sharingly multiplexed data from the multiplexer and generates an analog signal. Sample and hold circuits extract a predetermined correction signal from the analog output of the digital/analog converter and sample and hold them. The convergence correcting apparatus is driven in accordance with the respective correction signals held by the sample and hold circuits.

REFERENCES:
patent: 2853545 (1952-08-01), Rennick
patent: 4395662 (1983-07-01), Sexton, Jr.
patent: 4668977 (1987-05-01), Ohno et al.
patent: 4816908 (1989-03-01), Colineau et al.
patent: 4868668 (1989-09-01), Tavernetti
Color Television Textbook, Nippon Hoso Kyokai, pp. 262-265.

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