Kinescope with compensated conduction characteristic

Details Kinescope with compensated conduction characteristic Kinescope with compensated conduction characteristic

1985-02-08

1986-12-23

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358243, 315411, 315383, H04N 563

Patent

active

046315918

ABSTRACT:
A video monitor includes an image displaying kinescope which exhibits a temperature dependent conduction characteristic that results in declining light output and image brightness during an initial warm-up period, from a time soon after the system is initially energized to a time several minutes later when steady-state operation is reached. To counteract the declining kinescope light output during the warm-up interval, a compensation circuit having a time constant characteristic which approximates the kinescope conduction characteristic during the warm-up interval causes the kinescope to exhibit increasing light output and image brightness during the warm-up interval. Thus substantially uniform light output is produced over the warm-up interval.

REFERENCES:
patent: 3908159 (1975-09-01), Griffey
patent: 3924067 (1975-12-01), Arneson
patent: 4129885 (1978-12-01), Chovanec
patent: 4494048 (1985-01-01), Van Den Driessche
patent: 4546388 (1985-10-01), Williams, Jr.

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