发明名称 |
CRT Beam current control apparatus |
摘要 |
In a television picture display device wherein a cathode of a picture display tube is driven by an emitter-follower and a control signal for a beam current reference level control circuit is obtained from the collector circuit of this emitter-follower, measures are taken to compensate for leakage currents from and to the cathode. To this end a blacker-than-black current compensation circuit is provided while furthermore it is ensured that the blacker-than-black curent can be processed by the beam current reference level control circuit.
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申请公布号 |
US4224640(A) |
申请公布日期 |
1980.09.23 |
申请号 |
US19780972590 |
申请日期 |
1978.12.22 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
HOVENS, PAULUS J. M.;TRYZNA, MILOSLAV;SMEULERS, WOUTER;AMSEN, WILLEM H. |
分类号 |
H04N5/57;H04N5/16;H04N5/59;H04N9/18;H04N9/72;(IPC1-7):H04N5/68 |
主分类号 |
H04N5/57 |
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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