发明名称 |
Video signal processor for controlling the brightness and contrast of a display device |
摘要 |
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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申请公布号 |
US5504538(A) |
申请公布日期 |
1996.04.02 |
申请号 |
US19940364853 |
申请日期 |
1994.12.27 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TSUJIHARA, SUSUMU;INOUE, IKUNORI |
分类号 |
H04N5/59;(IPC1-7):H04N5/59;H04N5/18 |
主分类号 |
H04N5/59 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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