Variable black level bias image display

Details Variable black level bias image display Variable black level bias image display

1997-10-31

1999-03-30

Faile, Andrew I.

Television

Cathode-ray tube display beam current control

348173, 348377, H04N 559

Patent

active

058895582

ABSTRACT:
An image display is disclosed, in which a reference signal is superimposed on image signal in a fly-back period for controlling the bias voltage on the cathode of the CRT or the reference signal or the bias voltage on the grid G2 of the CRT such as to make the beam current in the CRT cathode to be constant by detecting the beam current in the reference signal period, while also obtaining brightness control. The image display comprises a stub pulse generator 2 for providing a stub on the black level side more than the image signal pedestal level, and an adder 3 for superimposing the stub pulse on the image signal. It is possible to change the reference signal voltage level to be on the black level side more than the image signal pedestal level, extend the brightness range, and obtain back luster float-up.

REFERENCES:
patent: 5416533 (1995-05-01), Kageyama

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