JPH02156792A - Convergence measuring device - Google Patents

Abstract

PURPOSE:To easily and accurately measure mis-convergence state by detecting longitudinal or lateral lines of each primary color displayed on a color cathode ray tube(CRT) with an optical sensor with a single peak directivity and calculating the quantity of mis-convergence. CONSTITUTION:A longitudinal line in red, green or blue is displayed on a tube screen 5a of the CRT 5 is displayed so as to be moved laterally by a prescribed interval each for each frame. it is detected by the optical sensor 8 with a single peak characteristic opposite to the tube screen 5a and the result is stored in a memory 3 through an amplifier 8, an A/D converter 9, a microcomputer 1. The microcomputer 1 applies interpolation processing to the data to detect a position in which the peak of the optical data of each primary color. Thus, for example, a difference of peak position of red and blue optical data with respect to a peak position of a green luminous intensity data, that is, mis- convergence is calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color CRT comparator for a television receiver.
The present invention relates to a convergence measurement device that determines a sense state.

[Summary of the Invention] The present invention provides the following features:
A vertical or horizontal line of each primary color is projected so as to move horizontally or vertically, and an optical sensor whose directional sensitivity characteristic exhibits a unimodal characteristic is placed opposite to the screen surface of a color CRT. The detection output of each primary color is stored in a memory, the detection output of each primary color stored in the memory is read out, and the amount of misconvergence is calculated by a calculation means, thereby making it possible to easily and easily determine the convergence state of a color CRT. This allows accurate measurement.

[Conventional technology]

Some conventional convergence measurement devices measure the convergence state by using a camera to photograph the surface of a color CRT.
The drawback is that the device is large and it takes time to set up.

[Problem to be solved by the invention]

In view of this, the present invention proposes a convergence measurement device that can easily and accurately measure the convergence state of a color CRT.

[Means to solve the problem]

The present invention provides means (7) for projecting embroidery or horizontal lines of each primary color on the tube surface (5a) of a color CRT (5) as a measurement object so as to move them in the horizontal or vertical direction, respectively; An optical sensor (6) whose directional sensitivity characteristic exhibits a single peak characteristic is placed opposite to the tube surface of (5), and a memory (3) for recording the detection output of each primary color of the optical sensor (6); Calculating means (3) that reads out the detection output for each primary color stored in the memory (3) and calculates the amount of misconvergence.
1).

[Effect]

According to the present invention, the means (7) projects the vertical or horizontal lines of each primary color on the tube surface (5a) of the color CRT (5) as the measurement object so as to move them in the horizontal or vertical direction, respectively. an optical sensor (6) whose directional sensitivity characteristic exhibits a single peak characteristic is placed opposite to the tube surface of the color CRT (5), and the detection output of each primary color of the optical sensor (6) is stored in a memory (3); The detection output for each primary color stored in the memory (3) is read out, and the amount of misconvergence is calculated by the calculation means (1).

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a circuit of a convergence measuring device according to the present invention, and FIG. 2 shows a mechanical configuration of an embodiment thereof. In these figures, (10) shows the convergence measuring device as a whole, and (4) shows a television receiver incorporating a color CRT (color cathode ray tube) which is the object of measurement. (5a) is a color CRT (5)
The tube surface is shown.

Next, referring to FIG. 1, the convergence measuring device (1
0) will be explained. (1) indicates a microcomputer, which includes a memory (built-in memory or external memory IJ) (3) and a display section (e.g. liquid crystal display) (
2) is connected.

(7) is a CRT control circuit, which is controlled by the microcomputer (1), and when measuring the amount of lateral misconvergence of the color CRT (5),
As shown in Figure 3, on the tube surface (5a) of T (5), one red, green, or blue vertical line (bright line extending vertically) is drawn at a predetermined distance [color A video signal is generated that moves horizontally (for example, by 1 mm) on the tube surface (5a) of the CRT (5), and the video signal is supplied to the color CRT (5) of the receiver (4). be done.

In the color CRT (5), as shown in Fig. 4, the electron beam (11) linearly impacts the fluorescent surface PH on the tube surface (5a) to generate a bright line, and the bright line is oriented horizontally. I will have to move.

Then, an optical sensor (6) whose directional sensitivity characteristic exhibits a single peak characteristic as shown in FIG.
They are arranged so as to face each other at arbitrary positions on the tube surface (5a) of the RT (5). In addition, in Fig. 5, the horizontal axis is the color CR.
The incident angle (in degrees) of light incident on the optical sensor (6) from the tube surface (5a) of T (5) is shown, and the vertical axis represents the intensity (incidence) of the incident light on the optical sensor (6) at each incident angle. The angle is O
Relative light intensity when the light intensity at o is 100%)
shows.

The optical sensor (6) converts light from the tube surface (5a) screen of the CRT (5), i.e., red, green, or blue vertical bright lines that move horizontally by a predetermined distance for each frame, into electrical signals ( detection signal). This detection signal is as shown in FIG.
This is light intensity data of a discrete synchronous waveform in which the light intensity at time points a, b, C1..., g at fixed time intervals exhibits unimodal characteristics as a whole, with a peak near time point d, and time point a.
, becomes 0 near g.

This detection signal is passed through an amplifier (8) to an A/D converter (
9) and is converted into a digital signal, then supplied to a memory (3) through a microcomputer (1) and stored for red, green, and blue.

The microcomputer (1) also performs interpolation processing on each green or blue digital detection signal, that is, the discrete light intensity data as shown in FIG. Finely changing light intensity data is obtained, and then the time point (position) at which the peak value of the light intensity data for each primary color is obtained is detected, for example, the peak value of green light intensity data is detected. The difference between the peak values of the red and blue light intensity data and the obtained time point (position), that is, the amount of misconvergence, is calculated.

In the above embodiment, the CRT control circuit (7) controls the color C
On the tube surface (5a) of RT (5), one red, green, or blue vertical line (emitting line extending vertically) is drawn for each husband and wife in the horizontal direction (horizontal direction) for one frame. In this case, a video signal that moves a predetermined distance each time is generated.
Instead, you can do the following: That is, as shown in FIG. 8, the CRT control circuit (7) controls the color CRT (
5) On the tube surface (5a), a plurality of vertical lines (many lines) of red, green, or blue are arranged at regular intervals in the horizontal direction at 1/N of the interval (however, , N=-2,3,4
, . . . in this case, a video signal may be generated that moves by N=4). In this case, color C
If the interval between the red, green, or blue vertical lines on the tube surface (5a) of RT (5) is 4 mm, the distance the vertical lines move per frame is 1 mm.

In this case, the detection signal from the optical sensor (6) is as shown in FIG.
As shown in the figure, at fixed time intervals A, B, C, D, a,
This is discrete light intensity data in which the light intensity at bSc, d, α, .

According to this embodiment, the optical sensor (6) is connected to the CRT (5).
Any position may be used with respect to the tube surface (5a), and the measurement period can be as short as 4 frames.In addition, in the present invention, red, green, and Since the blue and blue lines are projected independently, if the beam current of the CRT (5) changes, the high voltage changes accordingly, which may cause the position of the electronic pins of each color to shift. be.

Therefore, in order to prevent this, as shown in Figure 10, if a white raster is displayed on the tube surface (5a) of the color CRT (5) where measurement is not required, the instability of the high voltage can be reduced. Much improved.

Note that the convergence measurement results are displayed on the CRT (5) instead of being displayed on the display section (2) of the convergence measuring device.
) may be displayed.

In the above embodiment, a case was described in which horizontal misconvergence was measured. However, when measuring a vertical misconvergence amount, the CRT control circuit (7) controls the color CRT.
(5) On the tube surface (5a), a video signal is generated in which red, green, or blue horizontal lines move separately in the vertical direction by a predetermined distance (for example, 1 mm) every frame. Just do it like this.

〔Effect of the invention〕

According to the present invention described above, it is possible to obtain a convergence measurement device that can easily and accurately measure the convergence state, that is, the misconvergence state, of a color CRT.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing the main parts of the embodiment, Fig. 3 is a diagram showing a screen, Fig. 4 is an explanatory diagram, and Fig. 5 6 is a diagram showing the directional sensitivity characteristic curve of the optical sensor, FIG. 6 is a diagram showing light intensity data, FIG. 7 is a diagram showing interpolation processing data, and FIGS. 8, 9, and 10 are detailed explanations of the present invention. It is a diagram. (1) is a microcomputer, (2) is a display unit, (3
) is memory, (4) is receiver, (5) is color CRT,
(6) is an optical sensor, (7) is a CRT control circuit, (9) is an A/D converter, and (10) is a measuring device. Agent Sadado Ito Hidemori Matsukuma

Claims (1)

[Claims] 1. means for projecting vertical or horizontal lines of each primary color so as to move horizontally or vertically, respectively, on the screen of a color CRT as a measurement object; An optical sensor that faces each other and has a single-peak directional sensitivity characteristic, a memory that stores the detection output of each primary color of the optical sensor, and a memory that stores the detection output of each primary color stored in the memory to detect errors 1. A convergence measurement device comprising: arithmetic means for calculating a convergence amount. 2. Project a vertical or horizontal line of each primary color on the screen of a color CRT to be measured, moving it horizontally or vertically, respectively. The detection output for each primary color of the optical sensor is stored in a memory facing the screen surface of the CRT, and the detection output for each primary color stored in the memory is read out to calculate the amount of misconvergence. Features of convergence measuring device.