JPH01204596A - Mis-convergence automatic measuring method - Google Patents

Abstract

PURPOSE:To obtain high accuracy by measuring mis-convergence from the light emitting state of each signal in the vertical direction and horizontal direction separated into each monochrome such as red(R), green(G) and blue(B). CONSTITUTION:A camera 1 converts a grating stripe optical image at the part of a CRT screen desired to be measured into an electric signal, the signal is received by color picture processing sections 2-4 to cooperate with sub calculation sections 6-8 of each monochrome such as RGB. Moreover, the sub calculation sections 6-8 send an RGB video signal to a display section 9, calculates the light emitting center of each monochrome to cooperate with a main calculation section 10 thereby displaying mis-convergence onto the display section 9. Thus, the light emitting center is obtained based on the degree of the light emission of each monochrome and the difference of the light emitting center of the G color and the R, B colors is obtained accurately in vertical and horizontal directions. Thus, the mis-convergence is measured with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color cathode ray tube (hereinafter abbreviated as CRT).
The present invention relates to a measurement method that can be used to adjust and inspect color misconvergence in the manufacturing process of color televisions and the manufacturing process of color televisions.

Conventional technology An example of conventional misconvergence measurement is shown in Figure 2a.
The method shown in ,b was used.

That is, in a CRT II in a checkered reception state, visually recognize the amount of protrusion of the R light emitting state 12 and the 3 light emitting state 13 from the 0 light emitting state 14 in a necessary part on the CRT image receiving surface, and then place a ruler there and measure the amount of deviation. We have measured and evaluated whether there are any.

Problems to be Solved by the Invention However, with the above method, the measurement results are left to the senses and require skill, and high accuracy cannot be expected due to individual differences.

In view of the above-mentioned problems, the present invention provides an automatic misconvergence measurement method that allows the value of misconvergence to be determined from the emission ratio of each monochromatic color.

Means for Solving the Problems In order to solve the above-mentioned problems, the automatic measurement method for Lalar cathode ray tube misconvergence according to the present invention detects the misconvergence from the vertical and horizontal emission states of each signal separated into each single color of R2G and H. This special feature is characterized by being equipped with a means for measuring .The effects of this technical means are as follows.

In other words, by converting the optical image of the checkered stripes into an electrical signal using a camera and processing that signal as an image, the center of light emission is determined from the degree of light emission of each monochromatic color, and the difference between the R and B light emission centers relative to the 0 light emission center is calculated above and below. , can be accurately determined in the left and right directions.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a camera, which converts a checkered pattern image of a portion of the CRT tube surface to be measured into an electrical signal. The signals are received by each color image processing section 2.3.4, and are operated in conjunction with sub-operation sections 6, 7.8 for each of RGB single colors. Further, the sub-calculation units 6, 7.13 send RGB video signals to the display unit 9, calculate the emission center of each monochrome, and perform a cooperative operation with the main calculation unit 10 to display the misconvergence value on the display unit 9. .

The signal generator 5 operates to generate a checkered signal and a camera synchronization signal.

FIG. 3 is an enlarged view of the lattice stripe optical image shown in FIG. 2, and the image processed image is also the same image. 15, 16, and 17 have phosphors in each color of red, green, and blue, which are arranged regularly as shown in the figure. Also, other green phosphors 18 and 19 are included therein and are in a light emitting state.

Next, the operation of the configuration of this embodiment will be explained. As a representative example, a method for determining the light emission center in the x and X directions in a 0 light emission state will be described.

First, regarding the X direction, an arbitrary line such as x-r' is found as an example where the light emission state in the X direction can be grasped.

Looking at the light emission state of green G on x-xJ, green light emitter 1
6.18.19 are emitting light. Linear light body 16 at that time
．． Distance from the reference point x0 of the center of 19! 4. ! Set it to 2. In this case, the green phosphor 16 and the green phosphor 19
Let the ratio of the light emission states be the light emission ratio=smaller light emission/larger light emission. Here, it is applied when it is strong, and - is applied in the opposite case. Here, XO is the left and right phosphor 16.1
This is an example showing the center of light emission when the light emission of 9 is equal.

Next, regarding the Y direction, an arbitrary line such as y-y' is found as an example where the light emitting state in the Y direction can be grasped.

Looking at the light emission state on the y-y' twill line, only the green phosphor 20 is emitting light. Therefore, if the reference point y0 distance of the upper limit light emitting position on the y-y' traverse line at this time is 3' 2 and the lower limit is yl, the light emitting center in the Y direction can be determined by the following equation.

y1+72 G emission center = □ 70 in the figure is an example representing the light emission center in the Y direction.

Of course, it is natural to perform calculations on several lines in the X and Y directions and obtain the average to improve accuracy.

In this way, the emission center of green G is found, and the emission centers of red R and blue B are found in the same way, and the direction and amount of deviation between the emission centers of R and B with respect to the emission center of G in the X and Y directions is displayed. By displaying this in Section 9, misconvergence can now be easily measured. Here, each image processing unit 2,
3.4 and the sub-calculation units 6, 7, and 8 can determine the emission center of each phosphor, and further the main calculation unit 1o can determine the misconvergence. Note that, as can be seen from the above description, this is applicable not only to checkered images but also to dotted images.

Effects of the Invention The present invention automatically measures misconvergence, and can measure misconvergence in the vertical and horizontal directions with high precision (10 micron resolution).

Moreover, the following effects are produced.

That is, in the present invention, since misconvergence can be measured simply by attaching a camera to the part to be measured, it can be used not only as an inspection device but also as an adjuster to eliminate misconvergence while watching the display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a means for realizing an automatic misconvergence measurement method in an embodiment of the present invention, and FIGS. 2 and 3 are diagrams for explaining the operation of the measurement means. 1...Camera, 2...Red image processing section, 3...Green image processing section, 4...Blue image processing section, 5...・Signal generation section, 6, 7.8・
...Sub-computation section, 9...Display section, 1o...
...Main calculation section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure =

Claims (1)

[Claims] A dotted or checkered image is emitted on the surface of the color cathode ray tube to be measured, and the image is separated into the three primary colors of red R, green G, and blue B, and the brightness center in the vertical and horizontal directions is determined from the emission state of each monochrome separated signal. An automatic misconvergence measurement method that calculates misconvergence, which is the amount of deviation of R and B in the vertical and horizontal directions with respect to the center of G.