KR20010045818A - Device and method for automatic correction of horizontal size - Google Patents

Abstract

PURPOSE: An apparatus and method for automatically correcting a horizontal size is provided to correct a horizontal direct line distortion and to control a variation of a horizontal size in accordance with a variation of a beam current by detecting an ABL value using a feedback and increasing/decreasing data of a vertical parabolic wave form by comparing the detected ABL value with a set reference value and in accordance with the result. CONSTITUTION: An ABL average reference value(ABL_eve_ref) is set within a range no generating a phase distortion(S11). An ABL value being fed back from a chromatic signal amplifying unit for amplifying and outputting a color signal(R,G,B) to a video processing unit is detected(S12). The ABL value is compared with the ABL average reference value(ABL_eve_ref,S13, S15). If the ABL value is less than the ABL average reference value(ABL_eve_ref), an ABL value is calculated and the video processing unit is controlled by decreasing E-W(vertical parabolic wave form) data as the difference(S14). If the ABL value is more than the ABL average reference value(ABL_eve_ref), an ABL value is calculated and the video processing unit is controlled by increasing E-W data as the difference(S16). The E-W data are increased or decreased by repeating the above processes. If the ABL value is identified with the ABL average reference value(ABL_eve_ref), an average value of the E-W data corresponded to the ABL setting value is sensed and controlled(S17, S18).

Description

Device and method for automatic correction of horizontal size

The present invention relates to a horizontal size automatic correction device and method, and in particular, horizontal size automatic to automatically correct the horizontal size by varying the data of the vertical parabola waveform after comparing the ABL (beam current) value with the ABL average reference value A calibration device and method.

Conventional horizontal size correction device is shown in Figure 1,

An image processor 1 for processing an image signal, a vertical parabola amplifier 2 for inverting and amplifying EW DATA of a vertical parabola waveform output from the image processor 1, and the amplification A diode modulator (3) for modulating the data of the vertical parabola waveform, a horizontal driver (4) for making and outputting a horizontal signal (H-OUT) output from the image processor (1) as a horizontal drive signal, and A horizontal parabola waveform output from the diode modulator 3 to the horizontal output unit 5 for switching the horizontal signal by the horizontal drive signal of the horizontal driver 4 and the horizontal frequency output from the horizontal output unit 5. And a horizontal deflection yoke 7 for superimposing and outputting a signal output from the horizontal deflection output part 6 to the CRT 8 for horizontal deflection. .

The operation of the conventional horizontal size correction circuit configured as described above will be described with reference to the accompanying drawings.

First, the image processor 1 processes an image signal and outputs vertical parabolic waveform data EW DATA to the vertical parabola amplifier 2, and a horizontal signal H-OUT of the pulse wave to the horizontal driver 4. Will print

The vertical parabolic amplifier (EW AMP) 2 inverts and amplifies the input data of the vertical parabola waveform to a predetermined level and then outputs the diode modulator 3, and the diode modulator 3 inverts the vertical parabola. The waveform data is modulated to correct pincushion distortion and output to the horizontal deflection output unit 6.

On the other hand, the horizontal signal in the form of a pulse input to the horizontal drive unit 4 is made of a horizontal sawtooth wave and output to the horizontal output unit 5, the horizontal output unit 5 is driven by a horizontal sawtooth wave signal to the horizontal deflection output unit 6 ) Will output the sawtooth wave's horizontal frequency.

At this time, the horizontal deflection output unit 6 superimposes the vertical parabola waveform output from the diode modulator 3 on the horizontal frequency and outputs the horizontal deflection yoke (H-DY) 7 to the horizontal deflection yoke (7). ) Deflects the electron beam by supplying a signal output from the horizontal deflection output unit 6 to the CRT 8.

However, in the deflection circuit as described above, even in the screen configuration form as shown in the window pattern 9 of FIG. 2, the horizontal linearity (H-Linearity) is caused by a sudden change in the beam current (ABL). ) Distortion (a1, a2), pin cushion distortion, high pressure regulation (regulation) characteristics are not good.

That is, a sudden change in the beam current has a problem of generating a vertical linear distortion phenomenon in the boundary portion of the white and black portions in the form of a window pattern.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention provides feedback by detecting an ABL (beam current) value, and compares the detected ABL value with a reference value set therein. By increasing / decreasing the value, the vertical parabola waveform data is automatically changed according to the change of the beam current, thereby correcting pin cushion distortion and high pressure fluctuation characteristics. It is an object of the present invention to provide a horizontal size automatic correction device and method for controlling a change in size.

1 is a block diagram of a conventional horizontal size correction circuit.

2 is a diagram illustrating a screen display form according to a change in beam current.

Figure 3 is a block diagram of a horizontal size automatic correction device according to the present invention.

4 is a waveform diagram of a video signal according to the present invention;

5 is a flow chart showing a horizontal size automatic correction method according to the present invention.

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

1,11 ... Image Processing Unit 2,12 ... Vertical Parabola Amplifier

3 ... diode modulator 4,14 ... horizontal drive

5,15 ... horizontal output 6 ... horizontal deflection output

7.Horizontal deflection York 8,18 ... Crown tube

13 ... Vertical Parabola Modulator 16 ... Flyback Trans

17 ... color signal amplifier 19 ... microcomputer

Horizontal size automatic correction device according to the present invention,

An image processor, a vertical parabola amplifier for amplifying a vertical parabola waveform, a vertical parabola modulator for modulating the amplified vertical parabola waveform, and a horizontal driver for converting and outputting a pulse-shaped horizontal signal into a sawtooth waveform horizontal deflection signal. And a horizontal size correction device formed in a horizontal output unit,

An image amplifier for amplifying an output color signal of the image processor and feeding back an ABL value to the image processor;

And a micom that variably adjusts the data of the vertical parabola waveform by detecting an average value of the line unit signal amount with respect to the ABL value fed back to the image processing unit so as to automatically correct the horizontal size according to the beam current change.

Horizontal size automatic correction method according to the present invention,

(a) an initial setting step of setting an ABL average reference value within a range where phase distortion does not occur;

(b) an ABL detection step of detecting an ABL value after step (a);

(c) an ABL comparison step of comparing the ABL value detected in step (b) with an ABL average reference value set therein;

(d) control the data of the vertical parabola waveform to increase / decrease by the difference between the comparison result ABL average reference value and the ABL detection value in step (c); and if the comparison result ABL detection data is equal to the ABL average reference value, And a horizontal resizing step of recognizing an average value for the data.

Hereinafter, with reference to the accompanying drawings as follows. 3 is a block diagram of a horizontal size automatic correction device, FIG. 4 is a waveform diagram of an image signal, and FIG. 5 is a flowchart showing a horizontal size automatic correction method.

Referring to FIG. 3, an image processor 11 processing an image signal, a vertical parabola amplifier 12 amplifying a vertical parabola waveform processed by the image processor 11, and the amplified vertical parabola waveform A vertical parabola modulator 13 for modulating, a horizontal driver 14 for outputting a horizontal signal H-OUT processed by the image processor 11, and a modulated vertical parabola driven by the horizontal signal A flyback transformer for supplying a horizontal output unit 15 for switching a waveform and a high voltage in which a vertical parabola is superimposed on a horizontal signal by the switching output of the horizontal output unit 15 to the CRT 18 to deflect the electron beam. (FBT) 16, a color signal amplifier 17 for amplifying the color signals R, G, and B processed by the image processor 11 and outputting them to the CRT 18, and the color signal amplifier ( 17 is fed back to the image processing unit 11 from Comprising a microcomputer 19 for comparing the average reference value (ABL) of the sword current and the reference data (ABL_eve_ref) set therein and then increases or decreases the signal of the output vertical parabola waveform of the image processor 11 according to the result. Configuration.

Referring to the horizontal size automatic correction apparatus and method according to the present invention configured as described above are as follows.

First, the image processor 11 outputs a vertical parabola waveform (E-W DATA), a horizontal signal (H-OUT) and a color signal (R, G, B) in a pulse form after processing the image signal.

Then, the vertical parabola waveform is inverted and amplified to a predetermined level by the vertical parabola amplifier 12 and then modulated by the vertical parabola modulator 13 to correct pin cushion distortion.

The horizontal signal in the form of a pulse is made of a horizontal sawtooth wave input to the horizontal driver 14 to drive the horizontal output unit 15, and is output from the vertical parabola modulator 13 as a sawtooth wave at the horizontal output unit 15. The switching signal is output.

Then, the signal output from the horizontal output unit 15 is output by the flyback transformer 16 is boosted to a high pressure with a vertical parabola superimposed on the horizontal signal and supplied to the horizontal deflection end of the CRT 18 to deflect the electron beam. Let's do it.

Meanwhile, the color signals R, G, and B output from the image processor 11 are amplified to a predetermined level by the color signal amplifier 17 and then supplied to the CRT 18 for display.

At this time, when ABL data is fed back from the color signal amplifying unit 17 to the image processing unit 11, the microcomputer 19 connected to the image processing unit 11 by a serial bus is used as a line unit signal amount between syringes. The average value of the ABL values is detected (FIG. 4).

In addition, the microcomputer 19 compares the detected ABL data with the ABL average reference value ABL_eve_ref set therein, and according to the result, the vertical parabola waveform data EW DATA output from the image processor 11 is adjusted to the reference value. Increase or decrease to get closer.

That is, when the ABL value is larger than the ABL average reference value set therein, the data of the vertical parabola waveform is controlled to be reduced. When the ABL value is smaller than the set ABL average reference value, the data of the vertical parabola waveform is controlled to be increased. .

In this way, the vertical parabola waveform data is changed according to the ABL value, that is, the beam current change, fed back from the color signal amplifier 17 to the image processor 11 so that the horizontal size can be automatically corrected.

On the other hand, Figure 5 is a flow chart for the horizontal size automatic correction method,

First, the ABL average reference value (ABL_eve_ref) is set within a range where phase distortion does not occur (step S11), and thereafter, from the color signal amplifying unit 17 which amplifies and outputs the color signals R, G, and B. The ABL value fed back to (11) is detected (step S12).

The ABL value detected in step S12 is an average value fed back to the line unit signal amount of the scan section, and the ABL value is compared with the ABL average reference value ABL_eve_ref set therein (steps S13 and S15).

In this case, in step S13, when the detected ABL value is smaller than the ABL average reference value (ABL_eve_ref), the image processor 11 is controlled so that the EW data is reduced by the difference after calculating the ABL value (step S14). ).

If the ABL value is greater than the ABL average reference value (ABL_eve_ref) as a result of the comparison in step S13, compare and determine whether the ABL value is smaller than the ABL average reference value (ABL_eve_ref) in step S15. The image processing unit 11 is controlled so that the data EW DATA of the vertical parabola waveform is increased (step S16).

In the same manner as above, the vertical parabolic waveform E-W DATA output from the image processor 11 is increased or decreased until the ABL average reference value ABL_eve_ref is equal to the reference value set therein (steps S14 and S16).

Then, when the ABL average reference value (ABL_eve_ref) is equal to the ABL value set therein, the average value of the E-W data corresponding to the ABL set value is recognized and controlled (steps S17 and S18).

Accordingly, the data of the vertical parabola waveform is varied with respect to the change of the ABL (beam current), that is, the change of the beam current of the white portion in the window pattern and the change of the beam current of the black portion are small. By making it equal to the ABL average reference value ABL_eve_ref, the horizontal size can be corrected.

As described above, the present invention detects the beam current (ABL) level of the CRT, compares it with a reference level set therein, and then increases or decreases the vertical parabola waveform to make it constant regardless of the change in the beam current. In addition, there is an effect that the vertical linear distortion of the screen can be corrected by correcting the pin cushion distortion and the high pressure variation caused by the rapid change in the beam current.

Claims (3)

An image processor, a vertical parabola amplifier for amplifying a vertical parabola waveform, a vertical parabola modulator for modulating an amplified vertical parabola waveform, a horizontal driver for converting a pulse-shaped horizontal signal into a sawtooth waveform horizontal deflection signal, and outputting the same; In the horizontal size correction device made of a horizontal output unit, A color signal amplifier for amplifying an output color signal of the image processor and feeding back an ABL value to the image processor; A horizontal size including a microcomputer that variably adjusts data of a vertical parabola waveform by detecting an average value of a line unit signal amount with respect to an ABL value fed back to the image processor to automatically correct a horizontal size according to a beam current change Automatic Compensator. The method of claim 1, The microcomputer controls the data of the vertical parabola waveform to be reduced by the difference when the ABL value fed back to the image processor is larger than the ABL average reference value, and when the ABL value is small, and when the ABL value is small, Horizontal size automatic correction device characterized in that the control to increase the data. An initial setting step of setting an ABL average reference value within a range where phase distortion does not occur; An ABL detecting step of detecting an ABL value after the step; An ABL comparison step of comparing the ABL value detected in the ABL detection step with an ABL average reference value set therein; The ABL comparison step controls the data of the vertical parabola waveform to increase / decrease by the difference between the ABL average reference value and the ABL detection value, and if the comparison result ABL detection data is equal to the ABL average reference value, the average value of the data of the vertical parabola waveform. Horizontal size automatic correction method comprising a horizontal size adjustment step of recognizing the.