Modified black-level regulation based on warm up detection of CR

Details Modified black-level regulation based on warm up detection of CR Modified black-level regulation based on warm up detection of CR

1993-08-13

1994-06-14

Powell, Mark R.

Television

Cathode-ray tube display automatic black level bias control

348697, H04N 916, H04N 568, H04N 972, H04N 516

Patent

active

053215044

ABSTRACT:
A method for detecting the warm-up of a television CRT includes the following steps during a warm-up phase of the tube: providing the CRT with warm-up signals during predetermined line periods at the initial portion of frames; and detecting the cathode current of the tube during the occurrence of windows in correspondence with the predetermined line periods in order to enable black level regulation loops. The windows have a width smaller than a line period and are approximately centered on the line periods.

REFERENCES:
patent: 4450476 (1984-05-01), Tallant, II
patent: 4516152 (1985-05-01), Willis
patent: 4587566 (1986-05-01), Hinn
patent: 4599642 (1986-07-01), Willis
patent: 4660093 (1987-04-01), Craig et al.
patent: 4692793 (1987-09-01), Tamura et al.
patent: 4748497 (1988-05-01), Sengoku
Patent Abstracts of Japan, vol. 9, No. 136 (E-320) Jun. 12, 1986, & JP-A-60018086, (Toshiba K.K.) Jan. 30, 1985.

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