Apparatus for adjusting operating conditions of a cathode ray tu

Details Apparatus for adjusting operating conditions of a cathode ray tu Apparatus for adjusting operating conditions of a cathode ray tu

1978-01-23

1978-12-19

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 65, 358 30, H04N 962, H04N 920

Patent

active

041308298

ABSTRACT:
Cathode ray tube adjusting apparatus in a color television receiver includes a matrix and amplifier circuit coupled to a chrominance signal source, selectively coupled by a "service-normal" switch to a luminance or reference signal source. The matrixing and amplifying circuit includes a control grid DC bias potential development circuit and a cathode DC bias potential adjusting circuit, and is coupled to a cathode ray tube. In the "service" switching position, the DC bias potential adjusting circuit is varied to provide the proper cut-off potential conditions for the cathode ray tube. In the "normal" switchingposition, chrominance and luminance signals are matrixed and luminance signal drive is adjusted to provide the proper color temperature appearing on a viewing screen of the cathode ray tube.

REFERENCES:
patent: 3670095 (1972-06-01), Arumugham
patent: 3820155 (1974-06-01), Neal
patent: 3955212 (1976-05-01), Engel et al.
patent: 3959811 (1976-05-01), Shanley

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