KR100188667B1 - Convergence measurement and control method of color picture tube - Google Patents

Abstract

The present invention discloses a method and apparatus for measuring and adjusting the convergence of a color cathode ray tube. According to an aspect of the present invention, misconvergence is measured by recognizing information on a convergence state of an image pattern by a plurality of photosensors disposed in front of a screen of a color cathode ray tube, and based on this, And the direction of the beam due to the electromagnet effect is moved to adjust the convergence. According to this aspect, it is possible to reduce the cost of the apparatus configuration, and in the case of a large screen, it is possible to easily measure the convergence to various points in the screen, thereby improving the efficiency by shortening the working time.

Description

Method and apparatus for measuring and adjusting convergence of color cathode ray tube

FIG. 1 is a screen diagram of a color cathode-ray tube on which a cross-hatch pattern before convergence adjustment is displayed.

FIG. 2 is a screen state diagram of a color cathode ray tube on which a crosshatch pattern after convergence adjustment is displayed.

FIG. 3 is a schematic diagram showing a convergence measuring and adjusting apparatus for a color cathode ray tube according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: cathode ray tube 11,21: signal generator

22: multiplex 23: signal converter

25: Monitor 26: Processor (controller)

s, s': optical sensor

The present invention relates to a method and apparatus for convergence adjustment of a color cathode ray tube, and more particularly, to a method and apparatus for convergence adjustment of a color cathode ray tube that measures and adjusts the amount of convergence using a plurality of optical sensors.

2. Description of the Related Art In general, an in-line color cathode ray tube used as a display device such as a color television receiver or a color monitor is used to measure the convergence in a manufacturing process in order to faithfully reproduce the color of a displayed image. And an adjustment step. That is, three-color electron beams (hereinafter referred to as R, G, and B) of red, green, and blue emitted from three electron guns (three tubes) , And B beams) are focused on one pixel point of the screen of the cathode ray tube and adjusted to be converged at mutually different incident angles. For example, a cross hatch pattern is applied to a cathode ray tube to be measured for convergence and a signal generator such as a pattern generator to display the signal. At this time, if the convergence is not adjusted, a pattern in which R, G, and B images are separated from each other by a predetermined distance is displayed as shown in FIG. The amount of misconvergence in the R, G, and B image intervals in this pattern is measured.

Conventionally, in order to measure such a misconvergence, a displayed pattern of a screen of a cathode-ray tube is usually signal-recognized through a color camera, and the center of each color is obtained using the vision processor by using a vision processor, And the distance between them is represented by the value of the numerical value. Based on the measured numerical values, the operator rotates the magnet mounted on the neck portion of the cathode-ray tube while observing the displayed pattern so that the beam reaches a desired region of the screen. As a result, R , G, and B images are coincident with each other.

However, in the conventional method for measuring and adjusting convergence as described above, there is a problem that accuracy, uniformity, and working efficiency are deteriorated because an operator must observe each cathode ray and each set with eyes. In addition, since an expensive camera is used, it is difficult to measure misconvergence at a plurality of points in a screen in the case of a large screen, and the time required for the measurement is long.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for measuring and adjusting convergence of a color cathode ray tube using a plurality of optical sensors and a coil capable of obtaining an electromagnet effect The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for measuring and adjusting the convergence of a color cathode ray tube.

It is another object of the present invention to provide a most suitable apparatus for realizing the cathode ray and convergence measurement and adjustment method of the present invention to achieve the above object.

According to an aspect of the present invention, there is provided a method of measuring and adjusting a conversion of a color cathode ray tube,

A first step of displaying an image of a predetermined pattern on a screen of a color cathode ray tube;

A second step of sensing the image information of the image pattern displayed in the first step through a plurality of light detecting means;

A third step of amplifying a signal of the image information sensed in the second step and converting the amplified signal into a digital signal;

A fourth step of processing the digital signal converted in the third step by the control means and calculating it as miss convergence data for the image pattern in the first step;

A fifth step of displaying the miss convergence data extracted in the fourth step;

A sixth step of calculating convergence adjustment data for the image pattern in the first step based on the miss convergence data displayed in the fifth step;

A seventh step of varying the direction of the beam emitted from the electron gun of the color cathode ray tube by applying a current to the coil provided at the neck portion of the color cathode ray tube on the basis of the convergence adjustment data calculated in the sixth step .

In the method of measuring and adjusting convergence of a color cathode ray tube according to the present invention, it is preferable that a crosshatched pattern is formed on the screen of the color cathode ray tube through the n-pattern generator lacquer in the first step. In the second step, a plurality of photo sensors may be arranged in front of the screen of the color cathode-ray tube to detect the state of horizontal and vertical mis-convergence of the cross hatch pattern. In the fourth step, it is preferable that the digital signal converted in the third stage is calculated as a miss convergence measurement value for the image pattern of the color cathode ray tube through a frequency analysis (FET) by a DSP processor Do. In the sixth step, a convergence adjustment value is calculated on the basis of the misconvergence measurement value calculated in the fifth step, a current amount corresponding to the convergence adjustment value is input to a memory, It is preferable that the direction of the beam is changed by applying a current to the coil in a variable manner so that the convergence can be adjusted.

According to another aspect of the present invention, there is provided a color cathode ray and a convergence measuring and adjusting apparatus,

A signal generating means for forming a predetermined image pattern on a screen of a color cathode ray tube having a faint coil so as to obtain an electromagnet effect around the electron gun;

Light detecting means for detecting image light information of an image pattern displayed on a screen of the color cathode ray tube;

A first amplifier for amplifying the image light information detected by the light detecting means;

Signal converting means for converting a signal amplified by the amplifier into a digital signal;

A controller for processing the signal changed by the signal converting unit and calculating the processed signal as a miss convergence measurement value for the image pattern of the color cathode ray tube;

Display means for displaying a miss convergence measure calculated by the controller;

A memory device for inputting a measured misconvergence measurement value to the display means to calculate a convergence adjustment value, calculating a current amount corresponding to the convergence adjustment value, and applying a variable current to the coil;

A second amplifier coupled to the memory device for amplifying a current applied to the coil; And a control unit.

In the apparatus for measuring and adjusting convergence of a color cathode ray tube according to the present invention, in particular, the signal generating means includes a pattern generator and a pattern signal of the pattern generator so as to form a cross hatch pattern on the screen of the color cathode ray tube And a controller for controlling the motor. Preferably, the light detecting means is a plurality of photo sensors disposed in front of the screen of the color cathode ray tube. Preferably, the controller is a DSP processor for calculating a signal converted by the signal converting means by a frequency analysis (FET) as a misconvergence measurement value for an image pattern of the color cathode ray tube.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and apparatus for measuring and adjusting color cathode ray and convergence according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic configuration diagram showing a convergence measurement and adjustment apparatus with a color cathode ray tube according to the present invention.

Referring to FIG. 3, the apparatus for measuring and adjusting convergence of a color cathode ray tube according to the present invention, a color cathode ray tube 10 having a coil 11 provided to obtain an electromagnet effect around the electron gun, A pattern generator (12) for forming a crosshatch pattern on the screen, a plurality of photosensors (13) arranged in front of the screen of the color cathode ray (10) An amplifier 14, an A / D converter 15 for hinging a signal from the signal amplifier 14 with a digital signal, and a frequency analyzer (FET) 15 for converting the signal converted by the A / (16b) for calculating a misconvergence measurement value (16b) for the image pattern of the color cathode ray tube (10) by means of the DSP processor (16a), and a misconvergence measurement value A monitor 17 for displaying, a monitor 1 7), calculates a convergence adjustment value, calculates a current amount corresponding to the convergence adjustment value, and variably applies a current to the coil 11 provided in the color cathode ray tube 10 And a second amplifier 19 connected to the memory 18 for amplifying a current applied to the coil 11. The memory 18 is connected to the memory 18,

The method for measuring and adjusting the convergence of a color cathode ray tube according to the present invention is explained by the construction of a convergence measuring and adjusting apparatus for a color cathode ray tube according to the present invention having the above-described configuration.

According to an aspect of the present invention, a coil 11 is provided around the color cathode ray tube and the electron gun 10, and a current is applied to the coil 11 to adjust the convergence by moving the beam direction by the electromagnet effect. That is, the pattern generator 12 forms a crosshatch pattern on the screen of the color cathode ray tube 10 having the coil 11 around the electron gun and the screen. At this time, the image light information for the image pattern is detected by the plurality of photosensors 13 arranged in front of the screen of the color cathode ray tube 10, and the signal light is amplified through the signal amplifier 14. The amplified signal is converted into a digital signal by the A / D converter 15. This digital signal is calculated by the frequency analysis (FET) 16a in the DSP processor 16 as a missed convergence measurement 16b for the image pattern of the color cathode ray tube 10 and displayed on the monitor 17 do. The displayed misconvergence measurement value is input to the memory 18 to calculate a convergence adjustment value. The memory 18 calculates an amount of current corresponding to the calculated convergence adjustment value, and outputs the amount of convergence adjustment to the color cathode ray tube 10 And a current is variably applied to the coil 11 provided. The thus applied current is amplified by the second amplifier 19 connected to the memory 18 and applied to the coil 11. [ As a result, the direction of the beam emitted from the electron gun is shifted by the electromagnet effect of the coil 11 to cause the beam to emerge in a desired area of the screen, thereby adjusting the convergence so that the R, G, and B images are matched as shown in FIG. .

According to the present invention, since the image pattern is viewed using an optical sensor instead of a conventional camera, the cost for the device configuration can be reduced, and in the case of a large screen, convergence measurement can be easily performed for a plurality of points in the screen have. In addition, the effect of automatically measuring and adjusting the convergence can be obtained by repeatedly adding or subtracting the amount of current applied to the bean sprouts, thereby increasing the efficiency due to the shortening of the time.

Claims (10)

A first step of displaying an image of a predetermined pattern on a screen of a color cathode ray tube; A second step of sensing the image information of the image pattern displayed in the first step through a plurality of light detecting means; A third step of amplifying the signal of the image information sensed in the second step and converting it into a digital signal; A fourth step of processing the digital signal changed in the third step by the control means and calculating as misconvergence data for the image pattern in the first step; A fifth step of displaying the miss convergence data extracted in the fourth step; A sixth step of calculating convergence adjustment data for the image pattern in the first step based on the miss convergence data displayed in the fifth step; A seventh step of varying the direction of the beam emitted from the electron gun of the color cathode ray tube by applying a current to the coil provided at the neck of the color cathode ray tube on the basis of the convergence adjustment data calculated in the sixth step; Wherein the convergence measurement and adjustment method of the color cathode ray tube comprises: Wherein a crosshatched pattern is formed on the screen of the color cathode ray tube through the pattern generator in the first step. 2. The method of claim 1, wherein in the second step, a plurality of photosensors are disposed in front of the screen of the color cathode-ray tube to detect the state of horizontal and vertical misconvergence of the cross- A method for measuring and adjusting the convergence of a color cathode ray tube. The method as claimed in claim 1, wherein in the fourth step, the digital signal converted in the third step is calculated as a miss convergence measurement value for an image pattern of the color cathode ray tube through a frequency analysis (FET) by a DSP processor Wherein the convergence of the color cathode ray is measured. The method as claimed in claim 1, wherein, in the sixth step, a convergence adjustment value is calculated based on the miss convergence measurement value calculated in the fifth step, and a current corresponding to the convergence adjustment value is input to a memory, And the convergence can be adjusted by moving the direction of the beam by applying a current to the cathode of the color cathode ray tube. The method of claim 1, wherein the seventh step is repeatedly performed to perform convergence measurement and adjustment after the seventh step. A signal generating means for forming a predetermined image pattern on a screen of a color cathode ray tube having a coil provided so as to obtain an electromagnet effect around the electron gun; Light detecting means for detecting image light information of an image pattern displayed on a screen of the color cathode ray tube; A first amplifier for amplifying signal light information detected by the light detecting means; Signal converting means for converting a signal amplified by the amplifier into a digital signal; A controller for processing the signal converted by the signal converting means and calculating the processed signal as a miss convergence measurement value for an image pattern of the color cathode ray tube; Display means for displaying a miss convergence measurement value calculated by the controller; A memory device for inputting a missed convergence measurement value displayed on the display means to calculate a convergence adjustment value, calculating a convergence amount, and applying a variable current to the coil; A second amplifier coupled to the memory device for amplifying a current applied to the coil; And a condensing unit for condensing the color cathode ray tube. The color cathode ray tube according to claim 7, wherein the signal generating means comprises a pattern generator and a controller for controlling a pattern signal of the pattern generator to form a cross hatch pattern on the screen of the color cathode ray tube Convergence measuring and adjusting device for cathode ray tube. 8. The apparatus for measuring and adjusting convergence of a color cathode ray tube according to claim 7, wherein the X-ray detecting means is a plurality of photo sensors disposed in front of the screen of the color cathode ray tube. The controller as claimed in claim 7, wherein the controller is a DSP processor for calculating a signal converted by the signal converting means by a frequency analysis (FET) as a miss convergence measurement value for an image pattern of the color cathode ray tube Characterized by a convergence measuring and adjusting device for a color cathode ray tube.