发明名称 |
Cathode ray tube display |
摘要 |
A cathode ray tube display in which a signal for detection of a cathode current is inserted into a part of the vertical blanking period of the video signal to be displayed, a cathode current corresponding to the signal for detection is detected, and a cathode voltage or a grid voltage is negative feedback controlled so that the detected cathode current becomes constant, thereby stabilizing the cathode current. The display has a local overscan circuit for executing a vertical scan on the screen with a width larger than a predetermined scan width only at a timing of the cathode current detecting signal inserted for a vertical blanking period, and even in the case where an underscan system to scan by a width smaller than a predetermined display screen width is used as a scan system of the screen display. The invention prevents a harmful visible display image by the cathode current detecting signal appears on the screen.
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申请公布号 |
US5589883(A) |
申请公布日期 |
1996.12.31 |
申请号 |
US19940257441 |
申请日期 |
1994.06.08 |
申请人 |
HITACHI, LTD. |
发明人 |
OGINO, MASANORI;YAMADA, TAKEO;IKEDA, MIYUKI;FUJIKURA, TSUNEO;FUJIWARA, TAKAHIKO;NAKAGIRI, ETSUHIRO |
分类号 |
G09G1/04;G09G1/00;G09G1/16;H04N3/16;H04N3/22;H04N9/64;H04N9/73;(IPC1-7):H04N5/68 |
主分类号 |
G09G1/04 |
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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