Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
1999-08-02
2001-06-12
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
C315S364000, C348S806000
Reexamination Certificate
active
06246189
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Application No. 98-31317, filed Jul. 31, 1998, in the Korean Patent Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device, and more particularly, to a display device for correcting a distortion occurring in a bottom portion of a monitor.
2. Description of the Related Art
A display monitor is provided with an electronic gun emitting an electronic beam which is scanned to a monitor in horizontal deflection, and a picture is formed according to a density of the electronic beam. The electronic beam is deflected by an electromagnetic field formed from a deflection yoke. Therefore, when the electromagnetic field is affected by any cause from the outside, the deflection angle of the electronic beam can be distorted.
One of these distortions is that a picture is formed horizontally or vertically asymmetrical as a scanning of the electronic beam is performed abnormally by a resistance value of a picture receiving tube, except by a picture rotation due to an outside electromagnetic field. In addition, a picture may not rectangularly be displayed when an electric current is excessively provided to a deflection yoke.
SUMMARY OF THE INVENTION
Accordingly, in order to overcome such drawbacks in the conventional art, it is therefore an object of the present invention to provide a display device for correcting a distortion occurring in a bottom portion of a monitor.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
To achieve the above and other objects and advantages and in accordance with the purpose of the present invention, as embodied and broadly described, there is provided a display device for correcting a distortion of a bottom portion of a monitor, and having a vertical output circuit to generate a vertical output signal, the display device comprising: a vertical signal detecting part which detects the vertical output signal and ensures that the vertical output signal has a necessary voltage; a vertical blanking signal generating part which converts the vertical output signal detected from the vertical signal detecting part to a vertical blanking signal; a phase controlling part which varies a phase of the vertical blanking signal; and an integral circuit which integrates the phase varied vertical blanking signal and piling up it on a horizontal size controlling circuit.
REFERENCES:
patent: 5021719 (1991-06-01), Arai et al.
patent: 5898467 (1999-04-01), Woo
patent: 6020694 (2000-02-01), Shim
patent: 6060845 (2000-05-01), Tsukahara et al.
patent: 6108045 (2000-08-01), Onozawa et al.
patent: 6124685 (2000-09-01), Toriu et al.
Nguyen Hoang
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
Wong Don
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