KR100404172B1 - Apparatus for automatically compensating deflection - Google Patents

Abstract

PURPOSE: An apparatus for automatically compensating deflection is provided to improve the uniformity of a picture by automatically compensating a position error of deflection. CONSTITUTION: An H/V synch detector(22) detects vertical and horizontal synchronous signals according to a signal provided from a video processor(21). A first flyback unit and a second flyback unit(27,28) detect vertical and horizontal synchronous signals by using vertical and horizontal flyback pulses provided from a deflection magnetic field generator(25). A first comparator and a second comparator(29,30) compare the vertical and horizontal synchronous signals detected from the H/V synch detector with the vertical and horizontal synchronous signals detected from the first and second flyback units for calculating each synch error value. A first filtering unit and a second filtering unit(31,32) low-pass filter the synch error value output from the first and second comparators for outputting DC values.

Description

Automatic Deflection Compensation Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display system, and more particularly, to an automatic deflection correction apparatus capable of automatically adjusting screen position deviation in a display system.

In general, deflection in a TV system is to bend an electron beam by applying an electric field or a magnetic field to the electron beam irradiated by the electron gun in the TV receiver.

When an electric field is applied in a direction perpendicular to the traveling direction of the electron beam, the force acts in the opposite direction to the direction of the electric field (the direction of the positive electrode), and the electron beam is bent. The force acts to use the principle of bending the electron beam.

In TV systems, the deflection device is mainly composed of analog elements, and is characterized by a large number of coils or transs.

Since the deflection yoke (DY) wound on the CPT (Color Picture Tube) consists of coils, there is a slight deviation for each CPT. Was adjusted.

However, the unevenness of the screen is generated accordingly.

Here, the deflection yoke is a device that acts to deflect the electron beam by forming a constant magnetic field in order to accurately scan the electron beam generated from the electron gun of the TV to each pixel of the scrim. It is classified as a miss convergence correction device.

However, as the screen becomes flat or large in size, the amount of local miss convergence occurs non-proportionally in proportion to the distance between the electron gun and the screen.

Hereinafter, the deflection correction apparatus according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram of a deflection correction device according to the prior art.

Looking at the configuration with reference to Figure 1, the decoding unit 10 for decoding the input CVBS signal to generate a vertical / horizontal sync (H / V Sync) and Y, U, V signal; A video processor 11 for matrixing color signals R, G, and B for final display according to Y, U, and V signals output from the decoder 10; A deflection processor (12) generating vertical sawtooth waves and vertical pulses by receiving the vertical / horizontal sinks provided by the decoding unit (10); A vertical driver 13 for outputting a vertical driving current by using a vertical sawtooth waveform provided by the deflection processor 12; A horizontal driver 15 for outputting a horizontal driving current by using a vertical pulse provided from the deflection processor 12; A deflection magnetic field generator 14 generating a magnetic field for deflection by currents provided from the vertical and horizontal drivers 13 and 15 and providing the deflection magnetic field to the deflection processor 12 and the video processor 11; A storage unit 16 for storing the deflection data values; The controller 17 is configured to read the stored deflection data and provide them to the decoding unit 10 and the deflection processing unit 12.

An operation of the configuration will be described.

First, when a CVBS signal is input to the decoding unit 10, vertical / horizontal sinks and Y, U, V signals for video signals are generated, and the vertical / horizontal sinks are provided to the deflection processing unit 12, and Y, U, The V signal is provided to the video processor 11 to be matrixed into R, G, and B color signals for final display.

Here, the deflection processor 12 generates vertical sawtooth waves by a current source and a current driver using vertical / horizontal sinks provided by the decoder 10, respectively. It is provided to the vertical driver 13.

In addition, the deflection processing unit 12 is to provide a horizontal pulse (H Pulse) subjected to the duty adjustment to the horizontal driver (15).

Here, the vertical / horizontal drivers 13 and 15 generate the vertical / horizontal driving current according to the provided vertical sawtooth waveform and the horizontal pulse to provide the deflection field generator 14 to perform the final deflection display operation. .

Here, the deflection magnetic field generating unit 14 means a deflection yoke.

As described above, in the deflection correction apparatus according to the related art, since the DY is an analog component composed of pure coil and magnet, deviation occurs slightly for each DY.

One of the phenomena that occurs in this DY deviation is the screen position deviation, which causes the vertical and horizontal positions to be distorted.

Therefore, until now, there is a problem that the deviation must be manually adjusted one by one by the user.

Accordingly, an object of the present invention is to provide an automatic deflection correction device that can automatically correct a positional deviation of a screen during the deflection adjustment.

1 is a block diagram showing a deflection correction device according to the prior art;

2 is a block diagram showing the automatic deflection correction device according to the present invention.

Explanation of symbols for the main parts of the drawings

20: decoding unit 21: video processing unit

22: H / V playback section 23: deflection processing section

24: vertical driver 25: deflection field generating unit

26: horizontal driver 27, 28: first, second flyback

29, 30: first and second comparison unit 31, 32: first and second filtering unit

33: control unit 34: storage unit

The present invention provides a deflection correction device including an image processing unit and a deflection processing unit, wherein the synchronization unit detects vertical / horizontal synchronization signals using storage means storing deflection data and vertical / horizontal flyback pulses output from the deflection processing unit. Detection means; Vertical / horizontal synchronization means for comparing the vertical / horizontal synchronization signal detected by the image processor with the vertical / horizontal synchronization signal detected by the synchronization detection means and calculating a difference value; And a control means for providing a deflection data value corresponding to the vertical / horizontal synchronization difference value calculated by the vertical / horizontal synchronization comparing means to the deflection processing unit to automatically correct the deflection by reading from the storage means. It is done.

Hereinafter, an automatic deflection correction apparatus according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of the automatic deflection correction device according to the present invention.

In describing the configuration of FIG. 2, the same components that overlap with those of the prior art illustrated in FIG. 1 will be omitted and described.

Looking at the configuration, as shown in Figure 2, the H / V sink detection unit 22 for detecting the vertical / horizontal signal in accordance with the signal provided from the video processing unit 21; First and second flyback units 27 and 28 for detecting vertical and horizontal sinks using vertical / horizontal flyback pulses provided by the deflection magnetic field generator 25; A first and second sinks calculated by comparing the vertical / horizontal sinks detected by the H / V sink detector 22 with the vertical / horizontal sinks detected by the first and second flyback units 27 and 28, respectively; 2 comparison sections 29 and 30; The first and second filtering units 31 and 32 are configured to perform low pass filtering on the sync error values respectively output from the first and second comparators 29 and 30 and output the DC values as the DC values.

An operation of the configuration will be described.

The input CVBS signal is applied to the decoding unit 20 to separate the H / V sink required for deflection and provide it to the deflection processing unit 23.

Also, for the final display, the Y, U, and V signals are detected and output to the video processor 21 to generate and output R, G, and B color signals for the final display.

The composite sink or the Y signal is output to the H / V reproducing unit 22 so that the final display sink, that is, the H / V sink, can be separated separately.

The deflection processor 23 receiving the H / V sink from the decoding unit 20 generates the sawtooth waveform necessary for deflection again and provides it to the vertical driver 24.

Then, the H pulse is output to the horizontal driver 26 to finally supply the current to the deflection magnetic field generator 25. At this time, the clamper signal of the video processor 21 receives the vertical / horizontal flyback pulse. Is fed back for

In addition, the horizontal flyback pulse is fed back to the deflection processor 23. The reason for the feedback is that the deflection processor 23 is fed back to maintain a constant horizontal synchronization.

In addition, the horizontal and vertical flyback pulses are provided to the first and second flybacks 27 and 28 to generate the vertical and horizontal sinks.

Here, the first flyback 27 generates a positive pulse of a blanking interval obtained by subtracting a scan wave portion from the provided vertical flyback pulse, and the second flyback 28 has a positive of about 12us. The horizontal sink is generated and output to the first comparator 29 and the second comparator 30, respectively.

The first comparator 29 receives the vertical / horizontal sink provided from the H / V reproducing unit 22 and the vertical / horizontal sink provided from the first flyback 27 to perform mutual timing. After comparison, the time difference of each sink is calculated and output to the first filtering unit 31.

In addition, the second comparator 30 receives the vertical / horizontal sink provided from the H / V reproducing unit 22 and the vertical / horizontal sink provided from the second flyback 28 to be mutually timing. Then, the time difference of each sink is calculated and output to the second filtering unit 32.

Thus, the control unit 33 converts the waveforms output from the first and second comparators 29 and 30 to the DC waveforms, which are respectively input according to the time widths of the first and second filtering units 31 and 32, respectively. To provide.

The control unit 33 receiving the DC waveform corrects the unfolding position and the vertical position, respectively.

At this time, the controller 33 reads this value according to the input DC value compared with the deflection data value stored in the storage unit 34 and refreshes the deflection data value stored in the storage unit 34 to deflect it. The deflection data value is output to the processing unit 23.

Thus, the deflection can be automatically and uniformly adjusted according to the provided deflection data value.

The automatic deflection correction device according to the present invention has the effect of improving the uniformity of the screen by automatically correcting the positional error of the deflection according to the configuration of a simple hardware and the control of the microcomputer to prevent the unevenness of the screen occurs. .

Claims (6)

In the deflection correction device having an image processing unit and a deflection processing unit, Storage means for storing deflection data; Synchronization detection means for detecting a vertical / horizontal synchronization signal by using a vertical / horizontal flyback pulse output from the deflection processor; Vertical / horizontal synchronization means for comparing the vertical / horizontal synchronization signal detected by the image processor with the vertical / horizontal synchronization signal detected by the synchronization detection means and calculating a difference value; And a control means for providing a deflection data value corresponding to the vertical / horizontal synchronization difference value calculated by the vertical / horizontal synchronization comparing means to the deflection processing unit to automatically correct the deflection by reading from the storage means. Automatic deflection correction device. The method of claim 1, The synchronization detecting means may include a vertical flyback unit configured to detect a vertical synchronization signal by using a vertical flyback pulse provided by the deflection processor; And a horizontal flyback unit for detecting a horizontal synchronous signal using a horizontal flyback pulse provided by the deflection processor. The method of claim 1, And the comparing means comprises a vertical synchronous comparison unit and a horizontal synchronous comparison unit to compare the horizontal synchronous signal and the vertical synchronous signal, respectively. The method of claim 1, And a horizontal flyback unit for detecting a horizontal synchronous signal using a horizontal flyback pulse provided by the deflection processor. The method of claim 1, And a filtering unit for converting an AC value into a DC value and providing the control means to low pass filtering the value output from the vertical / horizontal synchronization signal comparing means. The method of claim 5, And the filtering unit comprises a vertical low pass filter (LPF) and a horizontal low pass filter (LPF).