Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-12-24
1982-07-20
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 10, 358 34, H04N 9535
Patent
active
043409040
ABSTRACT:
Apparatus is provided for achieving and maintaining gray scale tracking in a multibeam, cathode ray display device, despite fluctuations in the electrical characteristics of the display device and of video amplifiers driving the device. Tracking is accomplished by measuring the actual beam currents produced during the applications of test signals to the amplifiers and automatically adjusting the biases and gains of the amplifiers in response to differences between the measured beam currents and predefined beam currents which should be produced. The invention can also be used to automatically stabilize the beam current in a single beam cathode ray display device.
REFERENCES:
patent: 3927346 (1975-12-01), Spannhake
patent: 4012775 (1977-03-01), Smith
patent: 4014038 (1977-03-01), Hwang et al.
patent: 4200882 (1980-04-01), Janssen
patent: 4207592 (1980-06-01), Harwood
patent: 4277798 (1981-07-01), Hinn
IEEE Transactions on Consumer Electronics, "Automatic Stabilization of Background Color in Color TV Receiver" by P. J. H. Janssen et al., Feb. 1977, pp. 8-12.
Baker Carl W.
General Electric Company
Lang Richard V.
Murray Richard
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