JPH0984059A - Convergence measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a dynamic convergence value at another measurement point by correcting a convergence value of the other measurement points based on a convergence value at a measurement point in the middle of a display screen of a cathode ray tube. SOLUTION: Specified coefficient data are stored in a storage means of a measurement device 2 corresponding to a model of a deflection yoke 4 and a table 17 is generated. The coefficients are obtained by using measurement values of a standard deflection yoke as reference values and normalizing static convergence values in the horizontal and vertical directions at each measurement point by each median. A deflection yoke 4 to be measured is mounted on a standard cathode ray tube 5 and connected to a drive circuit 6 and set to a cathode ray tube device 3. The yoke is driven by a test signal ST from a signal generator 14 of the measurement device 2 to display a crosshatched test pattern. A central processing unit 13 measures the convergence based on position information at each cross points and a median is multiplied with data in the coefficient table 17 to obtain a static convergence correction value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence measuring device, for example, in the manufacturing process of a deflection yoke,
By correcting the convergence value at each measurement point based on the convergence value measured at the screen center, the dynamic convergence can be measured by omitting the static convergence adjustment work.

[0002]

2. Description of the Related Art Conventionally, in the manufacturing process of a deflection yoke, the deflection yoke is mounted on a cathode ray tube device to inspect various characteristics. In the convergence, the standard test pattern is displayed on the cathode ray tube, the convergence value of the screen center is adjusted to 0 based on the test pattern, and then the convergence value at each measurement point is measured.

Therefore, in this type of manufacturing process, after adjusting the static convergence with reference to the screen center, the convergence value at each measurement point is measured to measure the dynamic convergence, and from this measurement result, the quality of the deflection yoke is determined. It is designed to judge.

[0004]

By the way, in this type of deflection yoke, if the adjustment work of the static convergence irrelevant to the quality judgment of the deflection yoke can be omitted, the inspection work of this type can be simplified. You can
The work efficiency can be improved accordingly.

Further, some deflection yokes of this type are individually mounted in the cathode ray tube and then subjected to adjustment work such as convergence and shipped (that is, ITC).
(Integrated Tube Component)), in this case, if the dynamic convergence can be measured directly by omitting the static convergence adjustment work,
It is possible to easily check the change in the dynamic convergence by adjusting each adjustment point, and it is also possible to easily determine whether or not the optimum adjustment state.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a convergence measuring apparatus capable of measuring the dynamic convergence without the need for adjusting the static convergence.

[0007]

In order to solve such a problem, in the present invention, a convergence value is measured at a specified measurement point on the display screen from an image pickup result obtained by picking up an image on the display screen of the cathode ray tube. Applies to convergence measurement equipment. In this convergence measuring device, the dynamic convergence value at each measurement point is detected by correcting the convergence value obtained from another measurement point with reference to the convergence value obtained from the measurement point at the center of the display screen.

At this time, the convergence value obtained from the central measurement point is multiplied by a coefficient preset for each measurement point to obtain a multiplication value, and this multiplication is performed from the convergence values obtained from other measurement points. By subtracting the value, the convergence value obtained from another measurement point is corrected.

When the convergence value obtained from another measurement point is corrected with reference to the convergence value obtained from the measurement point at the center of the display screen, the static convergence value at the measurement point at the center is set to 0. It is possible to detect the convergence value of each measurement point at, and thus it is possible to detect the dynamic convergence value at each measurement point.

At this time, the convergence value obtained from the central measurement point is multiplied by a coefficient set in advance at each measurement point to obtain a multiplication value, and this multiplication value is subtracted from the convergence values obtained from other measurement points. By doing so, if the convergence values obtained from other measurement points are corrected, it is possible to obtain the measurement results by correcting the different sensitivities in the center periphery and the corner periphery.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a block diagram showing a deflection yoke characteristic measuring system according to the first embodiment of the present invention. The characteristic measuring system 1 takes an image of the display screen of the cathode ray tube device 3 while supplying various test signals ST from the measuring device 2 to the cathode ray tube device 3, and mounts the image on the display screen of the cathode ray tube device 3 based on the image pickup result. The characteristics of the deflected yoke 4 thus measured are measured, and if necessary, the quality of the deflected yoke 4 is judged based on these measurement results.

Therefore, the cathode ray tube device 3 includes the deflection yoke 4
Is formed by a standard device for inspecting the operation characteristics of the standard cathode ray tube 5 and the deflection yoke 4 is attached to the standard cathode ray tube 5, the test signal ST output from the measuring device 2 is input to the drive circuit 6. As a result, the cathode ray tube device 3 drives the deflection yoke 4 and the cathode ray tube 5 by the drive circuit 6, and displays various test patterns defined by the test signal ST on the cathode ray tube 5.

The measuring device 2 takes an image of the display screen of the cathode ray tube 5 by means of the display screen of the cathode ray tube 5 and the camera unit 7 arranged in front. That is, the camera unit 7 guides the incident light of the lens 8 to the optical block 9, and the optical block 9 decomposes the incident light into three systems. Further, in the optical unit 9, the camera unit 7 band-limits the incident light of these three systems by the color filters of red, green, and blue, respectively, and then collects it on the image pickup surface of the CCD solid-state image pickup device.

Red signal processing circuit (R) 10R, green signal processing circuit (G) 10G, blue signal processing circuit (B) 10B
Respectively process the output signals of these CCD solid-state image pickup devices to obtain red, green and blue color signals S.
Outputs R, SG and SB. The analog-to-digital conversion circuits (A / D) 11R, 11G, and 11B perform analog-to-digital conversion processing on the red, green, and blue color signals SR, SG, and SB, respectively.
SG and SB are 8-bit digital color signals D
It is converted into R, DG, and DB and output.

Frame memory (FM) 12R, 12G,
12B is controlled by a central processing unit (CPU) 13 to set these digital color signals DR, DG and DB to 1
After capturing the frames, the frames are sequentially output to the central processing unit 13 at a specified timing. The signal generator (SG) 14 outputs a test signal ST to the cathode ray tube device 3, and switches the test signal ST under the control of the central processing unit 13 in accordance with the measurement item of the measuring device 2. The monitor 15 displays the measurement result and the determination result output from the central processing unit 13.

As a result, the measuring apparatus 2 outputs the digital color signals DR, D while the desired test signal ST is being output.
By processing G and DB by the central processing unit 13, the characteristic of the deflection yoke 4 is measured, and the measurement result and the determination result obtained as a result can be displayed.

The central processing unit 13 controls the overall operation of the measuring device 2 by executing a series of processing programs recorded in a storage means (not shown), and executes a series of measuring processes set in the measuring device 2. Run. As a result, the measuring device 2 is capable of sequentially measuring the graphic distortion, the convergence characteristic and the like of the deflection yoke 4.

In measuring the convergence characteristics,
The central processing unit 13 executes the processing procedure shown in FIG. 1 with the crosshatch test signal ST output from the signal generator 14. That is, when the operator presses the measurement start operator, the central processing unit 13 moves from step SP1 to step SP2 and measures the convergence value.

In measuring the convergence value, the central processing unit 13 uses the frame memories 12R and 12R.
G and 12B are digital color signals DR, DG and D, respectively.
After capturing B, the captured digital color signal D
By sequentially inputting R, DG, and DB for processing, horizontal and vertical position information of each intersection of the crosshatch displayed on the cathode ray tube 5 is detected for each digital color signal DR, DG, and DB. To do.

Further, the central processing unit 13 uses the digital color signal DG of green as a reference to generate the digital color signal D.
The deviation of this position information is detected among R, DG, and DB, and each intersection of the crosshatch is set as a measurement point, and the misconvergence amount (that is, the convergence value) at each measurement point is measured. Further, the central processing unit 13 processes the measured convergence value by a prescribed processing method, and then, as shown in FIG.
, And notifies the operator of the convergence value.

In FIG. 3, each measurement point is indicated by a white circle, and the amount of misconvergence at each measurement point and the direction are indicated by horizontal and vertical dotted lines. And that the amount of misconvergence is 0 when the intersections of the dotted lines extending in the vertical direction overlap with the white circles. Further, the display on the upper left of the display screen is a display showing the deflection yoke 4, and in this embodiment, the display of the deflection yoke 4 is used to instruct the operator as to the adjustment location and the like as necessary.

If the operator has previously set that the dynamic convergence characteristic should be measured in this state,
The central processing unit 13 then proceeds to step SP3 and multiplies the convergence value obtained from the measurement point at the center by a prescribed coefficient to generate correction data.

Here, the measuring device 2 is formed so as to store and hold the prescribed coefficient data corresponding to the model of the deflection yoke 4 in the prescribed storage means, whereby the coefficient table 17 is formed. It is designed to be. That is, as shown in FIGS. 4 and 5, the coefficient table 17 is formed of coefficient data in the horizontal and vertical directions for each measurement point. Here, this coefficient is obtained by normalizing the static convergence values in the horizontal and vertical directions at each measurement point with the static convergence values at the center measurement points, based on the sensitivity measured in advance on the standard deflection yoke 4. It is designed to be formed.

As a result, the measuring device 2 is configured to calculate the convergence value based on the static convergence which is superimposed on the convergence value measurement result at each measurement point, from the center convergence value.

When the correction data is generated in this way,
In the subsequent step SP4, the central processing unit 13 subtracts the correction data obtained in each of the horizontal direction and the vertical direction from the convergence value of the corresponding measurement point. As a result, the central processing unit 13 enlarges the central measurement point in FIG.
(Arrow a)
(Corresponding to the adjustment in the direction indicated by 1), the convergence value at each measurement point is calculated, and thereby the dynamic convergence value is calculated.

After calculating the dynamic convergence value in this way, the central processing unit 13 proceeds to step SP5 to display the dynamic convergence value by the same display method as described above with reference to FIG. Further, the central processing unit 13 obtains the comparison result of the dynamic convergence value with the preset standard value, and judges the quality of the deflection yoke 4 from the comparison result. Further, the central processing unit 13 displays this judgment result on the monitor 15, and then moves to step SP6 to end this processing procedure.

In the above structure, the deflection yoke 4 to be measured is mounted on the standard cathode ray tube 5, then connected to the drive circuit 6, and set in the cathode ray tube device 3. In this state, the cathode ray tube 5 and the deflection yoke 4 receive the test signal S output from the signal generator 14 of the measuring device 2.
When driven by T to measure the convergence characteristic, a crosshatch test pattern is displayed.

The display of this crosshatch is picked up by the camera unit 7 of the measuring device 2 for each display of red, green and blue, and the picked-up results are shown as red, green and blue digital color signals DR, DG and DB. Frame memory 12
It is recorded in R, 12G, and 12B. For the digital color signals DR, DG, DB recorded in the frame memories 12R, 12G, 12B, the central processing unit 13 sequentially detects the position information of each cross hatch point,
Further, from the detected position information, the convergence value obtained by using each cross hatch intersection as a measurement point is measured.

From these convergence values, the center convergence value is multiplied by the horizontal and vertical coefficient data forming the coefficient table 17, whereby static convergence correction data is formed at each measurement point. To be done. As a result, from the horizontal and vertical convergence values at each measurement point,
The corresponding correction data are subtracted to measure the dynamic convergence value at each measurement point.

According to the above configuration, correction data is generated from the convergence value of the center and the convergence value of each measurement point is corrected to directly measure the dynamic convergence value without adjusting the static convergence. You can Therefore, in the inspection process of the deflection yoke 4, the measurement result can be easily obtained and the quality can be determined, and thus the time required for the inspection can be shortened.

In the above embodiment, the case where the present invention is applied to the inspection process of the deflection yoke has been described, but the present invention is not limited to this, and the ITC adjustment process and further the cathode ray tube device manufacturing process. It can be widely applied to etc. Especially when applied to the ITC adjustment process, since it is possible to confirm the change in the dynamic convergence value while adjusting various adjustment points, it is possible to adjust to an optimum adjustment state with a simple adjustment work.

Further, in the above-described embodiment, the case where the convergence value of the center is corrected by the coefficient table to generate the correction data has been described. However, the present invention is not limited to this, and the sensitivity around the center and the corner portion may be improved. If there is no difference, this processing may be omitted, and the convergence value of the center may be directly subtracted from the convergence value of each measurement point to calculate the dynamic convergence value of each measurement point.

[0034]

As described above, according to the present invention, the central value obtained by measuring at the center of the display screen is corrected by correcting the convergence value obtained by the other measuring point. It is possible to detect the convergence value of each measurement point when the static convergence value at the point is set to 0. By doing so, the static convergence adjustment work can be omitted and the dynamic convergence value at each measurement point can be easily measured. can do.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining the operation of a measuring device in a characteristic measuring system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the characteristic measuring system of FIG.

FIG. 3 is a schematic diagram showing a display of measurement results in the characteristic measuring system of FIG.

FIG. 4 is a chart showing coefficient data in the horizontal direction.

FIG. 5 is a chart showing coefficient data in the vertical direction.

[Explanation of reference numerals] 1 characteristic measuring system 2 measuring device 3 cathode ray tube device 4 deflection yoke 5 cathode ray tube 7 camera unit 13 central processing unit 14 signal generator 15 monitor 17 coefficient table

Claims (2)

[Claims] 1. A convergence measurement device for measuring a convergence value for a specified measurement point of the display screen from an imaging result obtained by imaging the display screen of the cathode ray tube. A convergence measuring apparatus, which detects a dynamic convergence value at each measurement point by correcting the convergence value obtained from another measurement point on the basis of the obtained convergence value. 2. The convergence value obtained from the central measurement point is multiplied by a coefficient preset for each measurement point to obtain a multiplication value, and the multiplication value is obtained from the convergence values obtained from other measurement points. The convergence measurement device according to claim 1, wherein the convergence value obtained from another measurement point is corrected by subtracting.