Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
1998-11-25
2001-09-04
Ham, Seungsook (Department: 2878)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
C315S411000
Reexamination Certificate
active
06285142
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 entitled DISPLAY APPARATUS POSSESSING THE STEP-UP CIRCUIT OF CONTROL LING HORIGONTAL SIZE earlier filed in the Korean Industrial Property Office on Nov. 25, 1997, and there duly assigned Ser. No. 97-33882, a copy of which is annexed hereto.
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a display apparatus of a cathode ray tube, and more particularly to a display apparatus of multi-mode cathode ray tube which is capable of enlarging a horizontal screen size without additional power consumption or a double trigger phenomenon.
2. Related Art
Generally, a display apparatus of a cathode ray tube includes a horizontal deflection circuit for deflecting an electron beam discharged from electron gun of the cathode ray tube (CRT) to right and left side of a screen, and the horizontal deflection circuit has a function that a user arbitrarily can enlarge or reduce the size of the horizontal screen.
In addition, as to the display apparatus of the multi-mode cathode ray tube which is able to accomplish a plurality of deflection frequencies, the screen size become smaller as an operating deflection frequency is higher, causing an inconvenience in a user's viewing.
Accordingly, in case that the operating frequency is higher, the user feels a necessity for the reduced screen to be enlarged, and for this reason, an importance for the horizontal screen size adjusting circuit is being increased.
I have found that there is a need for horizontal screen size adjusting circuit that does not require additional power consumption and that does not involve a double trigger phenomenon.
SUMMARY OF THE INVENTION
Objects of the present invention include providing a display apparatus having a horizontal screen size adjusting circuit in step-up type which is capable of increasing a horizontal screen size without an additional power consumption or a double trigger phenomenon occurring, even in a case that a horizontal deflection frequency is increased for accomplishing a high resolution.
In order to attain the above objects and others, there is provided a display apparatus having a horizontal screen size adjusting circuit in step-up type including a horizontal screen size adjusting unit being driven by an output signal of a pulse width modulation signal generating unit which generates and outputs a pulse width modulation signal in accordance with an applied horizontal screen size control signal, and generating and outputting a current which adjusts a horizontal screen size; a horizontal output circuit being driven by an output signal of a horizontal driving circuit which is driven by a horizontal oscillation frequency, and supplying a current inputted from the horizontal screen size adjusting unit to a horizontal deflection coil; a horizontal deflection coil for receiving the current from the horizontal outputting circuit to horizontally deflect an electron beam; and a S-shaped correction condenser being connected in serial to the horizontal deflection coil and correcting a linearity of picture displayed on a screen.
To achieve these and other objects in accordance with the principles of the present invention, as embodied and broadly described, the present invention provides an apparatus, comprising: a video display conveying varying visual information to a user, said video display forming a screen having a vertical screen size and a horizontal screen size, said visual information appearing on said screen, and said video display including an electron gun emitting a beam of electrons; a pulse width modulation signal generating unit receiving a horizontal screen size adjusting signal and accordingly generating a pulse width modulation signal, said pulse width modulation signal generating unit outputting said pulse width modulation signal; a horizontal screen size adjusting unit being driven by said pulse width modulation signal and generating a current including a first signal adjusting said horizontal screen size in accordance with a step-up type, said horizontal screen size adjusting unit outputting said current; a horizontal driving circuit being driven by a horizontal oscillation frequency signal and generating a second signal; a horizontal outputting circuit having a switch, said horizontal outputting circuit receiving said current from said horizontal screen size adjusting unit and said second signal, said second signal interrupting said switch, and said horizontal outputting circuit outputting said current; a horizontal deflection inductor receiving said current from said horizontal outputting circuit and said beam of electrons from said electron gun of said video display, said horizontal deflection inductor horizontally deflecting said electron beam in accordance with said current; and a capacitor being coupled in series to said horizontal deflection inductor, said capacitor correcting a linearity of said screen.
To achieve these and other objects in accordance with the principles of the present invention, as embodied and broadly described, the present invention provides an apparatus, comprising: a video display conveying varying visual information to a user, said video display forming a screen having a vertical screen size and a horizontal screen size, said visual information appearing on said screen, and said video display including an electron gun emitting a beam of electrons; a first unit receiving a first signal, generating a second signal in accordance with said first signal, and outputting said second signal, wherein said first signal corresponds to a horizontal screen size adjusting signal and said second signal corresponds to a pulse width modulation signal; a second unit receiving said second signal from said first unit, said second unit being driven by said second signal, said second unit outputting a first current including a third signal to adjust said horizontal screen size in accordance with a step-up type; a third unit receiving a fourth signal and generating a fifth signal, said fourth signal corresponding to a horizontal oscillation frequency signal; a fourth unit having a switch selectively turning said fourth unit on and off, said fourth unit receiving current from said second unit, said fourth unit receiving said fifth signal from said third unit, said fifth signal switching said switch, said fourth unit discharging a high voltage when said fourth unit is turned off in accordance with said fifth signal; a fifth unit receiving current from said fourth unit and receiving said beam of electrons from said electron gun of said video display, said fifth unit horizontally deflecting said electron beam in accordance with current received from said fourth unit, said fifth unit forming said high voltage, said high voltage of said fifth unit being discharged by said fourth unit when said fourth unit is turned off, and a sixth unit being coupled in series to said fifth unit, said sixth unit correcting a linearity of said screen, said sixth unit forming said high voltage, said high voltage of said sixth unit being discharged by said fourth unit when said fourth unit is turned off; and wherein said second unit further comprises: a seventh unit being driven by said second signal received from said first unit, said seventh unit outputting a sixth signal; a eighth unit receiving said sixth signal, said eighth unit amplifying current in accordance with said sixth signal, said eighth unit receiving a voltage from a power source; a ninth unit adjusting said horizontal screen size in accordance with current supplied through said eighth unit; and a step-up converting unit maintaining a back electromotive force generated at said ninth unit.
To achieve these and other objects in accordance with the principles of the present invention, as embodied and broadly described, the present invention provides a method, comprising: conveying varying visual information to a user utilizing a video display forming a screen hav
Bushnell , Esq. Robert E.
Ham Seungsook
Lee Shun
Samsung Electronics Co,. Ltd.
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