发明授权
- 专利标题: Cathode ray tube display
- 专利标题(中): 阴极射线管显示
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申请号: US257441申请日: 1994-06-08
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公开(公告)号: US5589883A公开(公告)日: 1996-12-31
- 发明人: Masanori Ogino , Takeo Yamada , Miyuki Ikeda , Tsuneo Fujikura , Takahiko Fujiwara , Etsuhiro Nakagiri
- 申请人: Masanori Ogino , Takeo Yamada , Miyuki Ikeda , Tsuneo Fujikura , Takahiko Fujiwara , Etsuhiro Nakagiri
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-417590 19901226
- 主分类号: G09G1/04
- IPC分类号: G09G1/04 ; G09G1/00 ; G09G1/16 ; H04N3/16 ; H04N3/22 ; H04N9/64 ; H04N9/73 ; H04N5/68
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.
公开/授权文献
- US6108393A Enhanced prescaler phase interface 公开/授权日:2000-08-22