Television – Video display – Cathode-ray tube
Reexamination Certificate
2000-01-27
2001-09-11
Eisenzopf, Reinhard J. (Department: 2614)
Television
Video display
Cathode-ray tube
C315S008000, C315S368110, C348S745000, C348S807000
Reexamination Certificate
active
06288757
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus and method for correcting the convergence of a television, and more particularly, to a television convergence correcting apparatus and method for automatically correcting the convergence of a television in consideration of the terrestrial magnetism of a television location set by a user.
2. Description of the Related Art
In general, projection televisions, which are greatly affected by terrestrial magnetism, include a red (R)-cathode ray tube (CRT) 101, a green (G)-CRT 102 and a blue (B)-CRT 103 and display signals output from the respective CRTs on a screen
105
via a mirror
104
, as shown in FIG.
1
. Here, three color signals of R, G and B are combined at a position to produce an image on a screen. In order to accurately combine the signals, convergence correction is necessary.
FIG. 2
shows parts which perform convergence correction in the respective CRTs constituting a projection television.
First, correction signals for convergence correction are transmitted to an amplifier
203
via a filter
201
and an input matching portion
202
to be amplified and then output to a deflection coil
204
which is a convergence yoke. Then, convergence correction is performed with respect to light irradiated from a CRT. A feedback portion
205
receives some of the correction signals output to the deflection coil
204
through the amplifier
203
and allows the amplifier
203
to operate in a stable state.
According to the conventional technology, convergence correction is performed by forcibly setting correction values depending on the terrestrial magnetism of territories in which the products supplied by various manufacturers are used.
However, when the projection television is transferred from one territory to another territory, wherein each of the two territories have different terrestrial magnetism, the convergence correction performed by forcibly setting correction values for terrestrial magnetism of a pertinent territory may cause mis-convergence due to a difference in the terrestrial magnetism between the two territories, resulting in an unclear image.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a convergence correcting apparatus and method used in a television, for automatically correcting convergence according to the corresponding terrestrial magnetism of a user's selected territory where the television is positioned.
Accordingly, to achieve the above objective, there is provided a convergence correcting apparatus of a television including an input portion through which a user inputs the name of a territory at which the television is installed, a storage portion for storing position data, and for storing basis data for convergence correction corresponding to the position data, a controller for reading from the storage portion the basis data for convergence correction corresponding to the territory name input through the input portion, and an operation unit for applying the basis data for convergence correction, which is received from the controller, to a predetermined convergence operation formula to operate convergence adjustment data.
According to another aspect of the present invention, there is provided a convergence correcting method of a television including the steps of (a) selecting and inputting the name of a territory at which the television is installed, (b) reading basis data for convergence correction corresponding to the position data of the territory name input in step (a), (c) applying the basis data for convergence correction read in step (b) to a predetermined convergence operation formula to obtain convergence adjustment data, and (d) applying a voltage corresponding to the convergence adjustment data to correct the convergence.
REFERENCES:
patent: 4816908 (1989-03-01), Colineau et al.
patent: 4870329 (1989-09-01), Ara
patent: 5510677 (1996-04-01), Nagashima
patent: 5550598 (1996-08-01), Itoh et al.
patent: 5966124 (1999-10-01), Devine
patent: 5978044 (1999-11-01), Choi
patent: 6011592 (2000-01-01), Vaughan et al.
patent: 6014168 (2000-01-01), Webb et al.
patent: 6130505 (2000-10-01), Webb et al.
Eisenzopf Reinhard J.
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Yenke Brian P.
LandOfFree
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