JPS61257096A - Convergence measuring instrument for color television receiver - Google Patents

Abstract

PURPOSE:To quantitize an amount of measured convergence and to make possible to rapidly measure a high precision amount of misconvergence by taking photograph of the television receiver via a three primary colors filter to measure a misconvergence quantity from the dot pattern of each color. CONSTITUTION:A standard dot pattern signal is input to the color television receiver 1 to be measured and the pattern picture plan on the receiver is photographed by television camera 2. Then, if three primary colors filter 3 selects red transmitted light only as an example, a red fluorescence striped luminance signal from TV1 is obtained and recorded in the field memory after A/D conversion, and muCPU 6 calculates the center of gravity of a dot image at every dot position of this data and records each dot position as data of X-Y coordinate axes on a floppy disk or the like. Similarly, green and blue dot image data is calculated, and comparison operation is executed between the calculated result and the red data already obtained, thereby measuring an amount of misconvergence.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a convergence measuring device for a color television receiver that can accurately measure the convergence of a color television receiver.

[Summary of the invention]

The television receiver to be measured, into which the standard dot pattern is input, is photographed through a switchable primary color filter on the front, and each monochromatic (R, G-B) dot pattern is obtained. Calculate the position of the dot image from the signal,
Since the convergence of the television receiver to be measured is measured from the position of the dot pattern of each color, the measured value is quantified and a highly accurate misconvergence amount can be quickly obtained.

[Conventional technology]

In a large television receiver 1, for example, a high-definition television over 20 inches, it is necessary to know the amount of misconvergence with high accuracy in order to carefully design and adjust the convergence device and its drive circuit.

Conventional accurate measurement of convergence involves inputting the Nit/Q-turn signal to the TV receiver being measured and measuring the direction of color shift while viewing each dot image scattered on one screen with the human eye. Was. Furthermore, in order to know the amount of misconvergence more precisely, a method is known in which a color camera is closely placed at each measurement point to photograph a dot image, and the amount of misconvergence is measured from the photographed photograph.

[Problem that the invention seeks to solve]

However, since the conventional method of measuring convergence relies on human vision, it is not possible to quantitatively determine the amount of misconvergence.

Also, as the equipment becomes larger, it takes longer to obtain data.
There was a problem that

In particular, when using cameras to simultaneously determine screen misconvergence, a large number of cameras are required, resulting in high costs and a complex structure, and it is still difficult to obtain a quantified amount of misconvergence. The problem is that it is not possible.

This invention was made to solve the above problem, and is suitable for convergence measurement of color television receivers in which the convergence state of the color television to be measured is output as highly accurate data on the entire screen at once. It provides equipment.

[[Means for solving problems]

A black and white television camera provided on the front side of a color television receiver to be measured, a switchable primary color filter placed on the front side of the black and white television camera, and an image signal output from the television camera capable of being stored. For example, a field memory and a microcomputer that calculates the center of gravity of a dot image from the data stored in the field memory, compares and calculates the dot positions for each color, and outputs the amount of misconvergence are provided.

[For production]

The television receiver to be measured is photographed with a °C television camera through a primary color filter, and the monochromatic 3-turn signal photographed with the television camera is input into a field memory. For the image signals input to the field memory, the center of gravity of the dot image for each color is calculated by a microcomputer or the like and stored on a floppy disk or the like. Then, the position of one spot image for each color is compared and calculated and output as misconvergence data.

〔Example〕

FIG. 1 is a schematic diagram of the convergence measuring device of the present invention, in which 1 is a television receiver to be measured, 2 is a black and white television camera with a primary color filter 3 provided in front of the imaging lens; , and the primary color filter 3 are attached to the television receiver 1 to be measured by a fixed hood 2A.

Note that the primary color filters 3R, 3G, and 3B are the second color filters.
As shown in the figure, a switching mechanism is provided in which R, G, and B transmitted light is selectively incident on the television camera 2 by a motor 3A.

4 is a signal processing device with a built-in A/D converter, D/A converter, frame memory, dot pattern generator, floppy disk, etc., 5 is a monitor TV%, 6 is a microcomputer, and 7 is for data display. TV, 8
is a block.

Next, an overview of the convergence measurement method of the present invention will be explained.

First, a dot pattern generator generates a standard dot pattern for the color television receiver to be measured (hereinafter simply referred to as the television to be measured). The dot 7g turn screen of a person giving a turn signal is photographed by a television camera 2.

In this case, if only the R (red) transmitted light is selected with the primary color filter 3, a luminance signal of the red fluorescent stripe of the TV to be measured 1 will be obtained, and this luminance signal will be A/
It is converted into, for example, a 6-bit digital signal by a D converter and recorded in a field memory (8x512x256-128 bytes).

The microcomputer 6 reads out the red dot pattern data stored in the field memory, calculates the center of gravity of the dot image for each dot position, and records it on a floppy disk or the like as X-Y axis coordinate data for each dot position.

Next, switch the primary color filter 3 to a position that selects only the transmitted light of, for example, G (green), and similarly import the luminance signal of the linear fluorescent stripe of the light to be measured 1 into the field memory, and perform microcombination from the green dot pattern. Ingredients - Evening 6
Each position of the dot image is sequentially output as X-Y axis coordinate data.

Then, a comparison calculation is made with the X-Y axis coordinate data of the red dot pattern to calculate the R-G misconvergence amount.

Thereafter, in the same way, the B (blue) transmitted light is selected by the B (blue) primary color filter 3, the X-Y axis coordinate data of the blue dot image is calculated, and the X-Y axis coordinate data of the red dot image is calculated. A comparison calculation is made with the coordinate data and the amount of misconvergence is output as data.

Figures 3 (a), (b), and (c) show the X-Y axis coordinate values of one dot image Dn obtained by such calculations, (Xc, yG) (XR, YR) (XB ,Y
B) indicates the dot coordinate values of G, R, and B, respectively, and A indicates the calculation area of the center of gravity. From these three X-Y coordinate data, convergence shift information rRG, rBG can be obtained as shown in FIG. (In this case, the amount of misconvergence is displayed centering on G, but R
1 or B may be the center. ) Convergence shift information rac = (XR-XcyR-yG) is
For example, the amount of misconvergence may be enlarged by 1 and displayed on the display television 7 shown in FIG. 1, or the deviation information rRG+ (rac) may be printed out as data.

According to the above-mentioned measuring method, the positions of the centers of gravity of dots at various locations on the screen can be calculated accurately all at once, and the amount of misconvergence can be quantitatively printed out at an extremely high rttut.

However, even with this method, for example in an in-line CRT, the positional accuracy in the X-axis direction is limited because the fluorescent dots of the primary colors are masked by a grit black striker with a spacing force of about -0.1 u. Ru.

That is, as shown in FIG. 5(a), the dot movement information will not change unless the rectangular dot moves by at least ΔX. Therefore, a dot position error occurs within the range of ΔX.

Therefore, in the embodiment of the present invention, a rhombic r-turn-Q-turn D is adopted as shown in FIG. 5(b).

If the diamond-shaped dot pattern D is used, both of its sides 11Q2 will intersect with the black stripe B and the luminescent stripe H at several places, so the boundary information when the dots move is expressed as a change in the luminance signal by the COD built-in dot. This improves the accuracy of measuring the center of gravity as it can always be obtained from a television camera.

FIG. 6 shows a block diagram of the convergence measuring device of the present invention, where 11 is a deflection device 11A.

A color television receiver to be measured is equipped with a deflection yoke IIB and other video amplifiers, etc. 12 is a black and white television camera for measuring the screen and has a built-in CCD image sensor.

12A is a deflection device, 128 is an amplifier, and 13 is a primary color filter, which is connected to the television receiver 11 to be measured as described above.
A switching mechanism is provided to capture 0 dots and 9 turns for each color. 14A is an A/D converter that converts an image signal into a digital signal; 14B is a field memory that records one screen worth of digital video signals; 15 is a microprocessor for writing data into the field memory 14B;
Read control, data calculation processing.

It calculates the center of gravity of the dots, calculates the amount of misconvergence, etc.

16 is a deflection system synchronization circuit, which generates a sampling signal. outputs synchronization signals for the shape capsule and deflection circuit.

17 is the aforementioned diamond-shaped dot waveform generator, 18 is P
shows the cut pattern generator.

In addition, 19 is a camera fixed tool P.

20 and 21 are a D/A converter and a monitor television for monitoring the data stored in the field memory 14B, 22 is a display for displaying the output data of the microprocessor 5, and 23 is a plotter.

24 is a floppy disk device for recording the X-Y coordinate values of the dot pattern, and 25 is a keyboard for inputting control signals.

It is preferable that the television camera 12 uses a fixed image sensor that is less affected by geomagnetism, and has a pixel count of 512 x 25.
With a resolution of 6%, it is possible to calculate the center of gravity of a dot image with considerable accuracy (0.2%).

〔Effect of the invention〕

As explained above, the convergence measuring device for a color television receiver of the present invention separates the dot pattern image of the television receiver to be measured into primary colors and photographs them with a black and white television camera, and then After calculating the position, the amount of misconvergence is output as data, so the measuring device is smaller and the amount of misconvergence can be obtained quantitatively and quickly with high precision. There is.

Further, due to the above-mentioned effects, there is an advantage that it can be incorporated into a production line and automatic adjustment of convergence can be performed.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing an overview of the convergence measuring device of the present invention, FIG. 2 is a perspective view showing an embodiment of a primary color filter, and FIG. 3 (a), (b), fcl, and ( b) is an explanatory diagram showing the shape of a dot image, and FIG. 6 is a block diagram of the convergence measuring device. In the figure, 1 is a color television receiver to be measured, 2 is a black and white television camera, 3 is a primary color filter, 4 is a signal processing device, and 5
6 indicates a monitor television, and 6 indicates a microcomputer. (a) Figure 5

Claims (1)

[Claims] A black-and-white television camera equipped with a color filter that selects three primary colors in order to photograph a television receiver to be measured into which a standard dot pattern signal is input, and a memory for recording the dot pattern signal photographed by the black-and-white television camera. and a microcomputer capable of calculating the centroid position of the monochromatic dot image of the television screen to be measured recorded in the memory and outputting the mutual deviation between the dot positions of the three primary colors. Convergence measurement device for television receivers.