KR920010374B1 - Method of controlling convergence - Google Patents

Abstract

The misconvergence of electron beams is detected automatically and quantitatively using the method so that misconvergence correction is done precisely and effectively. The method comprises the steps: (A) detecting intervals of color signal of a frame by a camera; (B) digitizing the detected color signal intervals and storing on a memory; (C) processing the digital color signal data using an auxiliary processor; (D) calculating quantity and direction of misconvergence using a CPU; (E) generating a motor control signal according to the calculated quantity and amount of mixconvergence; and (F) driving motors according to control signals to adjust purity and convergence.

Description

How to adjust convergence of color water pipe

1 is a block diagram showing the configuration of a convergence adjustment device for a color water pipe according to the present invention;

FIG. 2 is an explanatory diagram showing the principle of purity measurement of the convergence adjusting device of the color receiver in FIG.

3 is an explanatory diagram showing an image pattern of a purity measurement point set in the image memory.

Figures 4a and (b) is a partially cutaway perspective view and a cross-sectional view showing the structure of a conventional color water pipe, respectively.

5 is a configuration diagram of a magnet provided in the neck portion of FIG.

* Explanation of symbols for the main parts of the drawings

1: Color water pipe 2: Camera

3: Image memory 4: Sub operation processing unit

5: Central processing unit 6: Motor control unit

7: drive motor 8: strip band

9: light emitting unit 10: A / D conversion unit

The present invention is to adjust the convergence of the color water pipe, and in particular, the image formed on the fluorescent surface by each of the RGB electron beams is converted into a digital signal to calculate the amount and direction of the electron beams by the arithmetic processing unit. The microprocessor relates to a method for adjusting the convergence of a color receiver, which can adjust the convergence automatically by setting the acceleration / deceleration and the stop point based on the calculated result and controlling the driving means for magnet calibration.

In general, as shown in FIG. 4A, an electron gun 21 emitting three kinds of RGB electron beams and a dot-shaped phosphor emitting light in each of RGB colors are regularly printed. It is composed of a fluorescent surface 22 and a shadow mask 23 provided in parallel with the fluorescent surface 22 to allow the respective electron beams of RGB to reach these intrinsic phosphors.

Also, as shown in the side cross-sectional view of the color water pipe shown in FIG. 4B, the net part 24 of the water pipe includes a purity magnet 25, a 4-pole magnet 26, a 6-pole magnet 27, and a deflection coil 28. Etc. are installed. In addition, the purity magnet 25 has two pieces of ring-shaped magnets as shown in the cycle. When the beam is out of the orbit and the color purity is poor, the purity magnet 25 moves the three electron beams up and down or left and right at the same time to obtain the most suitable deflection center point. By passing the light through to improve color purity, the four-pole and six-pole magnets 26 and 27 move the orbits of the red (R) and blue (B) beams to the left and right of the center beam so that they meet at one point. The deflection coil 28 generates a magnetic field therein and deflects the electron beam to form an image when it hits the front surface of the fluorescent surface 22.

In the color receiving tube having such a structure, the RGB electron beam must be accurately irradiated to each fluorescent point to improve the color purity, and when the electron beam is irradiated out of the fluorescent point, the color is mixed to cause color mixing to make the image unclear. Misconvergence is generated.

Therefore, in the related art, in order to correct the misalignment of the electron beam, that is, the misconvergence, a skilled person can visually measure whether the center of the electron beam and the center of the fluorescence point coincide with each other by looking at the screen with a microscope. Empirically, the misconvergence was corrected by estimating the amount of misalignment of the electron beam.

However, if the deviation of the electron beam is corrected according to the conventional artificial method, the measurement cannot be performed quantitatively. Therefore, the measurement result greatly differs according to the individual to be measured, and the operator's skill in order to perform accurate measurement There is a problem that the fatigue of the operator is increased because it is required.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to measure the amount of deviation of the electron beam automatically and quantitatively, thereby improving the efficiency and precision of the purity adjustment of the color brown tube. It's about providing versioning methods.

Convergence adjustment method of the color water pipe of the present invention for achieving the above object is a three-color fluorescence of the strip band and red (R), green (G) and blue (B) bordering the hole and the hole of the shadow mask The camera detects the image signal interval from the light emitting unit, and the digital signal interval of the image signal detected by the camera is converted into digital data by the A / D conversion unit, and then stored in the image memory, and stored in the image memory. Based on the data ratio, the central processing unit determines the amount of deviation of the light emitting unit and its direction, and outputs a control signal for controlling the acceleration and deceleration and the stop point of the driving motor from the central processing unit to the motor control unit according to the determination result. 1 axis / 4 axis control according to the number of the drive motor connected to the motor control unit characterized in that the purity control and screen adjustment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of the convergence adjustment device of the color water pipe according to the present invention, and FIG. 2 is an explanatory diagram showing the principle of purity measurement of the convergence adjustment device in FIG. 3 is an explanatory diagram showing an image pattern of purity specific points set in the image memory according to the present invention.

As shown in FIG. 1, an industrial television camera 2 is provided in front of the object color receiving pipe 1 so as to be movable by the mobile device 30 and freely move left, right, left, and right. 2) detects the shifted amount of the light emitting portion and the shifted direction of the light receiving tube 1, and converts the analog amount into a digital amount in the A / D conversion unit 10 and is monitored from the color receiver 1 The convergence state of the image related to the red (R), green (G), and blue (B) colors is recorded in the lower memory 3 as digital data.

In this way, the recorded image data of the image memory 3 is arithmetic processed by the sub-operation processing unit 4 for each of three colors of red, green, and blue according to a predetermined program, and each of three colors of red, green, and blue. The result is input to the central processing unit (CPU) 5 to discriminate the amount and direction of the deviation of the light emitting portion, and output the control signal of the drive motor 7 to the motor control unit 6. At this time, the motor control unit 6 outputs a signal for driving the driving motor 7 and rotates various magnets installed in the net part of the color receiving tube 1 in accordance with the driving of the driving motor 7 to the number of driving means. Accordingly, the misconvergence is adjusted by performing one-axis or four-axis control.

On the other hand, a deflection coil 28 is provided outside the color receiving tube 1, and when a current is applied to the deflection coil 28, a magnetic field is applied to the receiving tube to deflect the electron beam. The image information in the analog state in which the electron beam is deflected in the camera 2 is converted into a digital signal by the A / D converter 10 and recorded in the image memory 3. In FIG. 1, reference numeral 30 denotes a movement time for moving the camera 2. FIG.

Next, a method of adjusting the convergence will be described with respect to the shifted amount and direction of the electron beam by the apparatus of FIG.

Convergence adjustment is divided into purity adjustment and screen adjustment, and the purity adjustment is performed by moving only the selected electron beam by selecting only the electron beam to be adjusted among the RGB electron beams when rotating the purity magnet. When rotating the 4-pole magnets, adjust them by moving the electron beams to the left and right of the center beam.

In addition, since the purity adjustment selects and uses the electron beam to be adjusted among the R.G.B electron beams, the color conversion switch is switched or the connection of the color conversion chip is disconnected so that the remaining electron beams do not come out except the selected one of the three color beams.

Then, when the current is deflected by applying a current to the deflection coil, the color receiver monitors the color screen of the selected electron beam in the camera 2, and the screen monitored by the camera 2 is in the A / D converter 10. After conversion to digital data, it is recorded in the image memory 3. By the way, an enlarged range is attached to the camera 2 so that the enlarged image data shown in FIG. 3 is recorded in the image memory 3.

FIG. 2 (I) shows the state where the color purity is adjusted, and (II) and (III) shows the state where the convergence is shifted to the left and right parts centered on the center screen of the screen. As in (III), the deviation degree of the purity is determined by comparing the intervals (a) and (b) between the strip band 8 and the light emitting portion 9.

FIG. 3 shows an image phantom diagram showing an enlarged image pantone of the object color receiving tube 1 recorded in the image memory 3, which is the same as that of FIG. When the magnetic field is applied to the water pipe 1, the electron beam is deflected to the right side of the screen. As can be seen from this figure, in the image memory 3, the strip band 8 has the darkest value, and then the portion where the R phosphor and the B phosphor are intermediate and the brightest appears as the light emitting portion 9 of the G form. The luminance value in the center can be easily compared. Therefore, the interval a is located between the brightest light emitting portion 9 and the darkest strip band 8, so that it is easily arithmetic by the auxiliary computing unit 4.

Next, a method of adjusting the purity of the color receiver tube according to the embodiment of the present invention shown in FIG. 1 will be described.

First, a current is applied to the deflection coil 28 so that the magnetic field is formed downward, and the selected electron beam is deflected on one horizontal side of the screen, thereby forming an image on the left side 11a of the screen as shown in FIG. The image signal is converted into digital data by the A / D conversion unit 10 which digitalizes the analog signal while being enlarged by the attached industrial camera 2, and is recorded as digital data in the image memory 3, and the recorded data is recorded. The calculation operation is performed in the auxiliary operation processing unit 4 to obtain the interval a as shown in FIG. 2 (II).

Next, the gap b in the state of FIG. 2 is measured by applying a current to the deflection coil so as to make the magnetic field upward in the same manner as described above and deflecting the selected electron beam to the horizontal left portion 11a of the screen. do.

Then, the ratios of the sizes of the intervals (a) and (b) measured in the auxiliary processing unit 4 are respectively calculated in the central processing unit 5 connected to the auxiliary unit 4 to determine the amount of deviation of the purity. The deviation direction of the light emitting part 9 is determined by the magnitude | size of the space | interval a and the value of (b) large and small according to this calculation result.

The calculation result is the calculation result connected to the central unit (5) calculates the driving acceleration and deceleration and the stop point of the drive motor (7) in the central unit (5) and outputs the corresponding control signal to the motor control unit (6) motor control unit ( The drive motor 7 is driven by the control of 6) to drive the purity magnet installed in the neck portion 24. Here, one-axis or four-axis control can be simultaneously performed according to the number of driving means connected to the motor control unit 6.

In the above description, the single-axis control refers to controlling the drive of the purity magnet, and the 4-axis control refers to the 4-pole and 6-pole magnets which are adjusted to correct the convergence of the red and blue beams on the left and right about the center beam. In terms of controlling the driving, in the above embodiment, the adjustment of the convergence of the green beam has been described as an example, but the convergence of the red or blue beam can be adjusted similarly to the green beam.

As described above, the present invention can contribute to the improvement of the quality of color-tel vision by quantifying the measurement of the purity and the amount of deviation of the screen, which was only dependent on the experience of the conventional operator, and even for the beginners with low skill level, it is equally short. It has the effect of precise purity and screen adjustment inside.

Claims (1)

In the method for adjusting the convergence of the color water pipe, the strip band bordering the hole and the hole of the shadow mask and the light emitting part in which each of three colors of red (R), green (G), and blue (B) are fluoresced The image signal interval is detected by the camera, the interval of the image signal detected by the camera is digitally stored by the A / D converter, and then stored in the image memory, and the secondary operation is performed on the ratio of the digital data stored in the image memory. Arithmetic processing is carried out by the processing unit, and the shift amount and direction of the light emitting portion are discriminated by the central processing unit based on the ratio of digital data output from the auxiliary processing unit, and driven from the central processing unit according to the determination result. The control signal for controlling the acceleration / deceleration and the stop point of the motor 7 is outputted to the drive motor control unit, and one-axis / four-axis control is performed according to the number of the drive motors connected to the motor control unit. A method for adjusting the convergence of a color receiver, characterized by adjusting the screen and adjusting the screen.