Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1994-12-27
1996-04-02
Groody, James J.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348694, H04N 559, H04N 518
Patent
active
055045383
ABSTRACT:
A video signal processor for controlling a displayed image on a CRT having a cathode electrode and a grid electrode includes a generator for generating a brightness reference signal, an adder for adding the brightness reference signal to a black level in a blanking period of an input video signal. The added brightness reference signal is applied to the cathode electrode though a current detector for detecting a current of the added brightness reference signal. A current level signal produced from the current detector is used for determining and clamping the peak of a control voltage applied to the grid electrode such that a voltage difference between a peak of the added brightness reference signal and the peak of the control voltage is maintained constant.
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Inoue Ikunori
Tsujihara Susumu
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
Miller John W.
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