Black level setting

Details Black level setting Black level setting

1997-01-23

1999-04-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348379, H01J 2952

Patent

active

058923373

ABSTRACT:
In a method of black level and gain control setting, including the steps of applying (42) at least two mutually differing control values (Vd1, Vd2) in a first predetermined ratio, and controlling (35, 3, 7, 15) the black level and gain in response to the at least two mutually differing control values (Vd1, Vd2), at least two mutually differing reference values (Iref1, Iref2) in a second predetermined ratio and corresponding to the at least two mutually differing control values (Vd1, Vd2) are applied (47) to the controlling step (35, 3, 7, 15), where a predetermined relationship exists between the first predetermined ratio and the second predetermined ratio, a first error value depending on a first control value (Vd1) and a first reference value (Iref1) is integrated (43) to obtain a black level setting value, and a second error value depending on a second control value (Vd2) and a second reference value (Iref2) is integrated (44) to obtain a gain setting value.

REFERENCES:
patent: 4370674 (1983-01-01), Johnson et al.
patent: 5278476 (1994-01-01), Ten Pierick et al.

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