KR20050002142A - Apparatus for compensating tilt of screen image - Google Patents

Abstract

PURPOSE: An apparatus for compensating tilt of a screen image is provided to detect a slant according to an area and a direction through a gauss meta using an integrated circuit such as a hall element and then to automatically compensate the tilt of the screen image, thereby capable of providing a clear screen. CONSTITUTION: An amplifying member(102) amplifies the hall voltage induced from a hall element and outputs a sensing voltage. A control member(104) compares the sensing voltage from the amplifying member with the voltage of reference earth magnetism and outputs a compensating voltage of the earth magnetism according to the difference. A tilt compensating member(106) outputs a screen tilt compensating signal according to the compensating voltage of the earth magnetism to a coil(108) in order to compensate the tilt of the screen.

Description

Distortion compensation device of screen image {APPARATUS FOR COMPENSATING TILT OF SCREEN IMAGE}

The present invention relates to an apparatus for compensating for distortion of a screen image, and more particularly, to an apparatus for compensating for distortion of a screen image by detecting a tilt according to a region and a direction using a Gaussian meta using an integrated circuit such as a hall element. .

Conventionally, when the screen is distorted due to the influence of the direction or the magnetic field, the user selects the "screen tilt" item in the manual to adjust the data value, and the adjustment value is controlled by the pulse width modulation (PWM) in the microcontroller. Output as a signal. The integrator converts the PWM output into a DC component, amplifies the converted DC value, and compensates for the distortion by shifting the deflection angle of the electron gun through a tilt driving circuit that converts the amplified voltage into a current. However, in the prior art, there is no uniform correction formula when the user is corrected by the influence of the direction and the magnetic field, so that an error about the degree of distortion may occur for each user, and an uncomfortable problem is possible only through the user adjustment item.

Accordingly, the present invention is to solve such a conventional problem, the present invention provides a device for compensating for the distortion of the screen image by detecting the inclination according to the region and direction using a Gaussian meta using an integrated circuit such as a Hall element Has its purpose.

The present invention to achieve the above object

An amplifier for amplifying the hall voltage induced by the hall element and outputting a sensed voltage;

A controller for comparing the sensed voltage from the amplifier with a voltage of a reference geomagnetic field and outputting a geomagnetic compensation voltage according to a difference; And

And a distortion compensator for outputting a screen distortion compensation signal according to the magnetic field compensation voltage from the controller to the distortion coil to compensate for the distortion of the screen.

1 is a block diagram illustrating a configuration of an apparatus for compensating for distortion of a screen image according to an exemplary embodiment of the present invention.

2 is a conceptual diagram illustrating generation of hole electromotive force that can be used in the preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

102: amplification unit 104: control unit

106: distorted compensator 108: distorted coil

110: electron gun

Hereinafter, an apparatus for compensating for distortion of a screen image according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a configuration of an apparatus for compensating for distortion of a screen image according to an exemplary embodiment of the present invention. 2 is a conceptual diagram illustrating generation of hole electromotive force that can be used in the preferred embodiment of the present invention. The misalignment compensator for the screen image includes an amplifier 102, a controller 104, and a misalignment compensator 106.

The amplifier 102 amplifies the Hall voltage induced by the Hall element and outputs a sensed voltage. In the display device using the cathode ray tube, the left and right of the screen are distorted due to the influence of the earth's magnetic field, that is, the earth's magnetic field, depending on the installation direction. Therefore, in order to realize stable image irrespective of the installation direction, the above measures should be corrected. For this purpose, the geomagnetic field correction coil is wound around the bottom of the deflection coil fixing part of the cathode ray tube, so that the direction is distorted by the current direction and the variable amount of current. Compensated. The basic operation of Gaussian meta using an integrated circuit is that if a current flows through an electrode, which is a Hall element, and a magnetic field is applied in a right angle, a potential difference is generated perpendicularly to the direction of the magnetic field current and the direction of the magnetic field. The potential difference can obtain a constant output voltage corresponding to a constant current applied thereto.

The controller 104 compares the sensed voltage from the amplifier 104 with respect to a reference geomagnetic field and outputs a geomagnetic compensation voltage according to the difference.

The misalignment compensator 106 outputs a misalignment compensation signal according to the magnetic field compensation voltage from the controller 104 to the misalignment coil 108 to compensate for misalignment of the screen.

Hereinafter, the operation of the distortion compensation apparatus for the screen image according to the present invention will be described. The amplifier 102 amplifies the Hall voltage induced by the Hall element and outputs the sensed voltage to the controller 104. The controller 104 compares the sensed voltage from the amplifier 104 to a reference geomagnetic field and outputs the geomagnetic field compensation voltage according to the difference to the misalignment compensator 106. The misalignment compensator 106 outputs a misalignment compensation signal according to the magnetic field compensation voltage from the controller 104 to the misalignment coil 108 to compensate for misalignment of the screen.

When the TV receiver is switched according to the installation direction, when the constant current flows into the Hall element due to the influence of the magnetic field, that is, the geomagnetic field, the Hall voltage induced from the Hall element is a linear element. Because of this, the exact DC voltage is transmitted to the controller 104. The controller 104 compares the voltage for the detected geomagnetic current with the voltage for the reference geomagnetic field and outputs the geomagnetic compensation voltage according to the difference to the misalignment compensator 106. Accordingly, the distortion compensating device is operated to transmit the compensated component to the distortion coil 108 that applies the electron gun 110, thereby correcting and displaying the degree of distortion of the screen image.

As described above, according to the present invention, it is possible to maximize the user's convenience by accurately detecting and automatically compensating the geomagnetic field of the place where the cathode ray tube (CRT) is installed by using the Hall element without manual operation. Can provide a screen.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to the embodiments described above, but in the field to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Any person with ordinary knowledge will be able to make various modifications.

Claims (1)

An amplifier for amplifying the hall voltage induced by the hall element and outputting a sensed voltage; A controller for comparing the sensed voltage from the amplifier with a voltage of a reference geomagnetic field and outputting a geomagnetic compensation voltage according to a difference; And a distortion compensator for outputting a screen distortion compensation signal according to the magnetic field compensation voltage from the controller to a distortion coil to compensate for the distortion of the screen.