Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
1998-07-31
2001-09-11
Ham, Seungsook (Department: 2878)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
C315S371000, C315S408000
Reexamination Certificate
active
06288502
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. § 119 from an application for HORIZONTAL POSITION ADJUSTING CIRCUIT FOR RASTER earlier filed in the Korean Industrial Property Office on the 31
st
of Jul. 1997 and there duly assigned Serial No. 21232/1997.
TECHNICAL FIELD
The present invention relates in general to an image display instrument, such as a TV receiver or a monitor using a cathode-ray tube, and more particularly to a horizontal position adjusting process and circuit for a raster which is capable of adjusting a horizontal position of the raster occurring on a fluorescent screen of the cathode-ray tube.
RELATER ART
Generally, an image display instrument includes a cathode-ray tube having an electron gun provided at a neck of the cathode-ray tube, and a fluorescent screen is provided at the front surface thereof, on which screen an electron beam outputted from the electron gun collides.
A deflection coil is provided on the outer side of the neck of the cathode-ray tube, and a deflection magnetic field is generated by the deflection coil. According to the deflection magnetic field, the electron beam discharged from the electron gun is deflected so as to be horizontal and to form a scanning line.
A raster is formed on the fluorescent screen of the cathode-ray tube by the scanning line, and the raster displays a predetermined image screen. A center of the image screen is identical to the center of the fluorescent screen of the cathode-ray tube, so that the image screen is displayed at the center without being slanted. For this purpose, the image display instrument includes a horizontal position adjusting circuit by which the raster is formed at the center of the fluorescent screen. In such an image display instrument, a problem arises when the position of a raster is selected from a predetermined position, in that the position of the raster is not properly adjusted due to its failure to correspond to a video mode of the image signal outputted from a computer system. This causes the raster to be formed in a slanted manner, that is, displaced to one side or the other of the display screen.
Since the raster is formed in such a distorted manner, even if the position of the image screen displayed on the fluorescent screen is adjusted by a horizontal display position adjusting circuit, it frequently occurs that the position of the image screen does not coincide with the center position of the fluorescent screen. This causes discomfort and/or dissatisfaction to the user, as well as poor reliability of the image display instrument. Therefore, there is a need for the development of a horizontal position adjusting circuit for a raster, in which a horizontal position of the raster is adaptively adjusted in accordance with the operating mode of the image display instrument. That is, there is a need for the development of a horizontal position adjusting circuit which will ensure that the raster is positioned at the center of the fluorescent screen of a cathode-ray tube of the display instrument. Finally, there is a need for the development of a horizontal position adjusting circuit which automatically adjusts the raster so that it is positioned at the center of the screen of the cathode-ray tube.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a horizontal position adjusting circuit for a raster, in which circuit a horizontal position of the raster is adaptively adjusted in accordance with an operating mode of an image display instrument so as to be positioned at the center of a fluorescent screen of a cathode-ray tube.
Another object of the present invention is to provide a horizontal position adjusting circuit for a raster by means of which a horizontal position of the raster is automatically adjusted so as to be positioned at the center of the fluorescent screen of the cathode-ray tube.
To achieve these and other objects, there is provided a horizontal position adjusting circuit for a raster, with a reference voltage outputting unit for outputting a reference voltage to enable a raster to be centered on a fluorescent screen; a reference voltage adjusting unit for varying the output voltage of the reference voltage outputting unit in accordance with an operating mode which displays an image signal; and a deflection voltage outputting unit for generating a deflection voltage in accordance with the output voltage of the reference voltage outputting unit and for applying it to a horizontal deflection coil.
Additional advantages, objects and other features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The object and advantages of the invention may be realized and attained as particularly pointed out in the appended claims.
REFERENCES:
patent: 4642533 (1987-02-01), Carpenter
patent: 4686432 (1987-08-01), Berland et al.
patent: 4706115 (1987-11-01), Colineau et al.
patent: 5287043 (1994-02-01), Brag
patent: 5420484 (1995-05-01), Morrish
patent: 5504521 (1996-04-01), Webb et al.
patent: 6014168 (2000-01-01), Webb et al.
Bushnell , Esq. Robert E.
Ham Seungsook
Lee Shun
Samsung Electronics Co,. Ltd.
LandOfFree
Horizontal position adjusting circuit for raster does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Horizontal position adjusting circuit for raster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Horizontal position adjusting circuit for raster will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2548833