KR100222943B1 - The convergence adjustable method and apparatus of color braun tube - Google Patents

Abstract

The present invention relates to a method and apparatus for adjusting convergence of a color brown tube, the method comprising: obtaining pattern data by photographing a predetermined pattern formed on a screen of the color brown tube; Determining a convergence adjustment value by evaluating miss convergence for an arbitrary measurement position from the pattern data; Storing the convergence adjustment value in a memory; A signal generation step of generating a pattern signal for a pattern generated on the screen of the color brown tube and a trigger pulse corresponding to a predetermined portion of the pattern; And adjusting the yoke coil based on the stored convergence adjustment value according to the trigger pulse. This facilitates the automatic measurement and automatic adjustment of the convergence by making the position of the measuring point coincide with the position of the adjusting point.

Description

Color Brown Tube Convergence Adjustment Method and Apparatus

The present invention relates to a method and apparatus for adjusting convergence of a color brown tube.

The color CRT is required to focus red, green, and blue electron beams scanned from three electron guns through a shadow mask to a fluorescent surface. In this case, the coincidence of three electron beams at one point of the shadow mask hole is called convergence. If there is no convergence at one point of the shadow mask hole, there is a misconvergence in which red, green, and blue electron beams scanned from three electron guns do not touch the phosphors of the corresponding color but emit light by touching the phosphors of different colors. As a result, color bleeding occurs in the CRT. Therefore, in the CRT, the convergence magnet or the convergence yoke are used to correct misconvergence, thereby converging three electron beams on the shadow mask.

The overall system configuration of the convergence adjusting device for measuring such convergence and adjusting the misconvergence is shown in FIG. As shown in FIG. 1, the signal generator 11 transmits a cross hatch pattern signal to the cathode ray tube of the color brown tube 12, and measures the cross hatch pattern displayed on the screen of the color brown tube 12. ) Is measured and delivered to the control unit 14. The control unit 14 calculates the convergence adjustment value based on the measured value and transfers the convergence adjustment value to the adjustment unit 15. The adjusting unit 15 adjusts the convergence by adjusting the convergence yoke provided around the cathode ray tube.

When the signal generator 11 transmits a cross hatch pattern signal to the cathode ray tube of the color brown tube 12 as a video signal, the three electron guns of the cathode ray tube emit red, green, and blue light on the screen of the color brown tube 12. Mixed white light results in a cross hatch pattern.

Since the white light on the screen of the color brown tube 12 is different in intensity depending on the degree of convergence of red, green, and blue light scanned by three electron guns, the amount of convergence is obtained by measuring the brightness of the white light. The most common type of photometric device is the CCD camera 13a. The white light on the screen of the color-brown tube 12 captured by the CCD camera 13a is classified into red, green, and blue light, and is converted into electrical signal data from the luminance data of the scanning line. Is converted. The A / D converter 13b in the measuring unit 13 converts the electrical signal into a digital signal and transmits the electrical signal to the frame memory 13c. The frame memory 13c displays the luminance data of the scan line converted into the digital signal. CRT 12 Stores from the top left to the bottom right of the screen as a unit.

The control unit 14 receives the data stored in the measuring unit 13 as an electric signal, calculates a convergence adjustment value for each color, and then transfers the adjustment value to the adjustment unit 15. The adjusting unit 15 adjusts the convergence on the color brown tube 12 by changing the deflection coil of the cathode ray tube or the magnetic flux of the magnetic field through the adjusting module.

On the other hand, since the adjustment unit 15 performs the convergence adjustment only at a position corresponding to the intersection point of the cross hatch pattern on the screen of the color brown tube 12, the adjustment position is fixed, but the measurement position depends on the shape and size of the color brown tube 12. It depends. That is, as shown in Figure 2, the measurement position is between the vertical lines (V1, V2, V3, V4) of the cross hatch pattern, the adjustment is the horizontal scan line (h1) and the vertical lines (V1, V) of the cross hatch pattern Since it is made only at each intersection where V2, V3, V4) meets, it is difficult to obtain the exact adjustment value at the adjustment position, and it takes a lot of time since the adjustment value must be corrected based on the measured value between the intersection points.

Accordingly, it is an object of the present invention to provide a method and apparatus for adjusting convergence of a color brown tube which matches the adjusting position and the measuring position regardless of the shape and size of the color brown tube.

1 is an overall system configuration diagram of a convergence adjusting device;

2 is a cross hatch pattern diagram shown in the color-brown tube,

3 is an overall system configuration of the convergence adjustment device according to the present invention

4 is a luminosity graph shown along a horizontal scan line,

5 is a graph illustrating a trigger pulse signal according to a horizontal scan line.

* Explanation of symbols for main parts of the drawings

11,31: Signal generating unit 13,33: Measuring unit

14,34 control unit 15,35 control unit

H1, H2, H3, H4: Horizontal line of cross hatch pattern

V1, V2, V3, V4: Vertical lines of the cross hatch pattern

h1: horizontal scan line

The above object is, according to the present invention, in the method for adjusting the convergence of a color brown tube, the step of imaging the pattern to obtain pattern data, and determining the convergence adjustment value by evaluating miss convergence for any measurement position from the pattern data. An evaluation step for generating a pattern in the color brown tube, a signal generation step for generating a trigger pulse for each cross hatch portion of the pattern, and storing the adjustment value and adjusting the yoke coil each time the trigger pulse is received. It is achieved by the convergence adjustment method of the color CRT, characterized in that it comprises an adjustment step.

Here, in the adjusting step, it is preferable to store the adjustment value corresponding to each intersection point of the cross hatch pattern, and it is effective to store the adjustment value in the corresponding adjustment position address by the trigger pulse in the adjustment step.

Further, the above object is, according to the present invention, in the convergence adjusting apparatus, measuring means for imaging a pattern to obtain pattern data, and evaluating a misconvergence of an arbitrary measurement position from the pattern data to determine a convergence adjustment value. An evaluation means, a signal generating means for generating a pattern in the color brown tube and generating a trigger pulse for each cross hatch portion of the pattern, and storing an adjustment value and adjusting the yoke coil each time the trigger pulse is received. A convergence adjusting device characterized by adjusting means.

Here, the adjustment means preferably has a memory for storing the adjustment value corresponding to each intersection of the cross hatch pattern, and the adjustment means is a means for storing the adjustment value in the corresponding adjustment position address by the trigger pulse. It is preferable to have.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is an overall system configuration of the convergence adjustment device according to the present invention. As shown in FIG. 3, when the signal generator 31 sends a cross hatch pattern signal to the cathode ray tube of the color brown tube 32, the white light of the cross hatch pattern is generated on the screen of the color brown tube 32. The white light is obtained from the measuring unit 33, classified into red, green, and blue light, and then the luminance data of the scanning line is obtained. The controller 34 calculates the convergence adjustment value by converting the luminance data into an electric signal and receiving the control unit 34. At this time, whenever a trigger signal comes from the signal generator 31, the convergence adjustment value of the controller 34 is transmitted to the adjuster 35, and the adjuster 35 receives a trigger signal from the signal generator 31. The adjustment value of the memory 35b is updated to transmit the adjustment value to the converged yoke coil.

When the signal generator 31 sends the cross hatch pattern signal to the cathode ray tube made of three electron guns in the color brown tube 32, the cathode ray tube scans three electron beams on the fluorescent surface of the color brown tube 32, On the screen of the CRT 32, a white cross hatch pattern appears. In order to measure the cross hatch pattern on the screen of the color brown tube 32, a CCD camera 33a is installed at a distance of about 1 meter in front of the color brown tube 32, and the cross hatch pattern is installed on the CCD camera 33a. To shoot. The white light of the cross hatch pattern picked-up is an analog signal as light intensity data with respect to a scanning line.

That is, as shown in FIG. 2, while the three electron guns of the cathode ray tube are horizontally scanned from the left P1 to the right P2 on the color-brown tube 32 screen, the vertical line V1 of the cross hatch pattern and the horizontal scan line h1 intersect at C1. . As shown in FIG. 4A in which the area C including the intersection point C1 is enlarged, the intensity signal of the scanning line appears at the intersection point C1, and the intensity signal approaches the intersection point C1 along the scanning line, gradually increasing the luminosity, and then moves away from the intersection point. It is an analog signal with low brightness.

As shown in FIG. 4B, the analog signal is classified into three colors of red, green, and blue, amplified, and then converted into digital values through the A / D converter 33b to be converted into digital values. Stored at 33c. Here, the misconvergence of the color brown tube 32 is obtained by comparing the relative distances of the places R1, B1, and G1 where the luminous intensity becomes the maximum point in each of the classified luminous intensity data with a reference value.

In addition, the signal generator 31 generates the white light of the cross hatch pattern on the screen of the color brown tube 32, and simultaneously generates a trigger pulse where the vertical line and the horizontal scan line of the cross hatch pattern meet each other. That is, as shown in Fig. 2, during the horizontal scanning from the upper left P1 to the upper right P2 on the screen of the color brown tube 32, the intersection C1 where the horizontal scan line h1 meets the vertical lines V1, V2, V3, V4 of the cross hatch pattern, Luminance data for each scan line is obtained at C2, C3, and C4. When the luminance data is shown with respect to one horizontal scan line, it is as shown in FIG. 5B. As shown in FIG. 5C, the signal generator 31 A trigger pulse corresponding to the vertical line of the cross hatch pattern is generated based on the luminance data.

The controller 34 calculates a convergence adjustment value based on the relative distances of the maximum values R1, B1, and G1 of red, green, and blue light. The calculated adjustment value is transmitted to the adjustment unit 35 whenever a trigger pulse is input from the signal generation unit 31.

The adjusting unit 35 applies a buffer 35a for temporarily storing the adjustment value and a signal generator 31 to the memory 35b and the memory 35b for adjusting the converged yoke coil by applying a predetermined current according to the convergence adjustment amount. And an address counter 35c for designating an address in accordance with a horizontal synchronous signal and a vertical synchronous signal from the same.

While the three electron guns of the cathode ray tube are continuously scanned from the upper left to the lower right of the color brown tube 32, the adjusting unit 35 receives the horizontal synchronizing signal and the vertical synchronizing signal generated from the signal generating unit 31 sequentially. By operating the address counter 35c, the convergence is adjusted by sending the adjustment value in the memory 35b corresponding to the address in each address counter 35c to the converged yoke coil. Here, in the signal generator 31, the trigger pulse is continuously generated at the position corresponding to the intersection point of the cross hatch pattern during the horizontal synchronization signal and the vertical synchronization signal, so that the trigger pulse is adjusted in the memory 35b of the adjustment unit 35. Since the adjustment value corresponding to the intersection point of the cross hatch pattern among the values is transmitted to the converged yoke coil, the adjustment position and the measurement position coincide. That is, the pattern is generated and the memory 35b of the adjusting unit 35 is synchronized so that the adjustment information is written in the same adjustment position of the memory 35b as the measuring point by a trigger pulse generated only at the intersection of the cross hatch during operation. .

On the other hand, even if the adjustment value is not updated, the convergence adjustment value contained in the memory 35b is continuously input to the adjustment coil of the color brown tube 32 to perform convergence adjustment.

As described above, according to the present invention, in the method and apparatus for adjusting the convergence of the color brown tube, the adjustment point and the measuring point coincide, so that the automatic measurement and the automatic adjustment of the convergence can be facilitated, and the production time of the color brown tube can be shortened. An efficient aspect is provided.

Claims (5)

In the convergence adjustment method of the color brown tube, Photographing a predetermined pattern formed on the screen of the color brown tube to obtain pattern data; Determining a convergence adjustment value by evaluating miss convergence for an arbitrary measurement position from the pattern data; Storing the convergence adjustment value in a memory; A signal generation step of generating a pattern signal for a pattern generated on the screen of the color brown tube and a trigger pulse corresponding to a predetermined portion of the pattern; And adjusting the yoke coil based on the stored convergence adjustment value according to the trigger pulse. The method of claim 1, The pattern is a cross hatch pattern, And said trigger pulse and said convergence adjustment value are generated corresponding to each intersection point of said cross hatch pattern. The method according to claim 1 or 2, And said adjustment value is stored in a corresponding address in said memory by said trigger pulse. In the convergence adjusting device of the color brown tube, A measuring unit which picks up a predetermined pattern formed on the screen of the color brown tube to obtain pattern data; An evaluation unit for determining a convergence adjustment value by evaluating miss convergence for an arbitrary measurement position from the pattern data; A storage unit which stores the convergence adjustment value in a memory; A signal generator for generating a pattern signal for a pattern generated on a screen of the color brown tube and a trigger pulse corresponding to a predetermined portion of the pattern; And an adjustment unit for adjusting the yoke coil based on the stored convergence adjustment value according to the trigger pulse. The method of claim 4, wherein And said adjustment value comprises a storage unit stored in said address in said memory by said trigger pulse.

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