JP2839190B2 - Convergence deviation measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a color cathode ray tube or a color display device using the color cathode ray tube.
The present invention relates to a convergence deviation measuring device suitable for automating convergence adjustment.

[Conventional technology]

In the manufacturing process of a color cathode ray tube or a color display device using a color cathode ray tube, in order to reproduce the original color by the color cathode ray tube, each electron beam for the three primary colors is concentrated on one point over the entire display surface. This adjustment is usually called convergence adjustment.

For such convergence adjustment, a convergence adjustment was previously performed by detecting the deviation of the convergence visually by an adjustment technician and adjusting the convergence based on the detection result. Is being developed. This automatic convergence adjusting device is described in, for example, "Development of Automatic Color CRT Purity Convergence Adjusting Device" (Technical Reports IF77-72, 1978, IEICE).

[Problems to be solved by the invention]

Although the convergence automatic adjustment device is capable of automatically performing convergence adjustment, the device itself is large-scale and very expensive. The reality is that the convergence deviation is detected and the convergence adjustment is performed based on the detection result.

As described above, when the conventional convergence adjustment is automatically performed using the automatic convergence adjustment device, the automatic convergence adjustment device is large-scale and expensive, so that a large installation space is required or a color CRT is required. On the other hand, when the adjustment is visually performed by an adjustment engineer, a skilled adjustment engineer is required, and the adjustment engineer is tired at the time of adjustment.

The present invention solves such a problem, and an object of the present invention is to provide a convergence deviation measuring device that can use a simple and inexpensive convergence deviation measuring device to automate measurement.

[Means for solving the problem]

The object of the present invention is to detect and convert the emission of two different primary color phosphor dots, which are horizontally arranged in front of the face plate of the color cathode ray tube to be measured and are differently combined among the three primary color phosphor dots on the phosphor screen. Three photoelectric conversion elements for generating an output, a driving power supply for sequentially generating three electron beams of the color cathode ray tube to be measured one by one, and a vertical deflection in which values are changed stepwise by vertically scanning each electron beam. Controls the deflection power supply, which supplies the deflection yoke mounted on the color cathode ray tube to be measured, and the drive power supply and the deflection power supply, which supplies the current and the horizontal deflection current, whose value changes in tens of thousands of steps at each change of the vertical deflection current for horizontal scanning. A processing device for detecting, as horizontal deflection current values, three electron beam positions at which the conversion outputs of the three photoelectric conversion elements are maximum,
The processing device obtains the difference between the detected two horizontal deflection current values for each of the three photoelectric conversion elements, and compares the obtained value with the corresponding two primary color phosphor dot pitch,
This is achieved by measuring the deviation of the convergence of the three electron beams.

[Action]

The output of the photoelectric conversion element arranged on the front side of the face plate of the color cathode ray tube to be measured becomes maximum when the incident light is incident on the light receiving surface from a right angle direction. That is,
If the three electron beams are concentrated at one point on the fluorescent screen, that is, if the convergence is matched, the output of the photoelectric conversion element will be maximum at the same position on the fluorescent screen, but if the convergence is wrong, Is maximized when each electron beam reaches a different position according to the amount of deviation of the convergence.

For this reason, the positions of the three electron beams are accurately and
In order to obtain the convergence easily, the convergence deviation amount can be easily obtained by moving the electron beam in multiple steps in the horizontal direction.

That is, the horizontal deflection current values corresponding to the points at which the three photoelectric conversion elements for detecting the photoelectric conversion outputs from the phosphor dots of two different colors generate the maximum photoelectric conversion outputs are obtained, and the obtained horizontal deflection current values are obtained. By comparing the difference between the three electron beams and the corresponding two-color phosphor dot pitch, the deviation of the convergence of the three electron beams can be obtained.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of a convergence deviation measuring device according to the present invention.

In Figure 1, 1 is the measured color CRT, 1F its face plate, 2 a driving power source, the deflection yoke 3, 4 deflection power, 5 _1, 5 _2, 5 ₃ 3 one-dimensional photoelectric conversion element , 6 is a processing device, 7 is a cathode socket, 8a is a second
The control signal 8b is a first control signal.

As shown in FIG. 1, the color cathode ray tube 1 to be measured is
The deflection yoke 3 is mounted on the outer periphery of the funnel, and the cathode socket 7 is fitted into the end of the neck. The deflection yoke 3 is connected to a deflection power supply 4, and the cathode socket 7 is connected to the drive power supply 2. One-dimensional photoelectric conversion element 5 ₁ 3 As will be described later in the faceplate 1F front of the measured color CRT 1, 5 _2, 5 ₃ are arranged, one-dimensional photoelectric conversion element
5 ₁ , 5 ₂ , 5 ₃ are connected to the processing device 6. The processing device 6
It is connected to the drive power supply 2 and the deflection power supply 4 respectively.

Figure 2 is a sequence state and three one-dimensional photoelectric conversion element 5 ₁ of phosphor dots of three colors in some of the phosphor screen formed on the faceplate 1F of the measured color CRT 1,
5 is an explanatory view showing the arrangement of _2, 5 _3.

In FIG. 2, R is a red phosphor dot, G is a green phosphor dot, B is a blue phosphor dot, and 5a, 5b and 5c.
Is 5 _1, 5 _2, each of the light receiving surface of the ₃ dimensional photoelectric conversion element.

As shown in FIG. 2, the red phosphor dots R, the green phosphor dots G, and the blue phosphor dots B are arranged one by one and regularly arranged in a triangle. One one-dimensional photoelectric conversion element 5 ₁ of the light-receiving surface 5a has three phosphor dots R arranged in a triangle, G, 2 pieces of phosphor dots in the B, for example, a green phosphor so as to detect the emission of dots G and the red phosphor dots R, other one of the one-dimensional photoelectric conversion element 5 _{and second} light-receiving surface 5b were also arranged in a triangle 3
Two phosphor dots R, G, and B, for example, a green phosphor dot G and a blue phosphor dot B
Emission so as to detect the, remaining one of the one-dimensional photoelectric conversion element ₃ of the light receiving surface 5c, like the three phosphor dots R arranged in a triangle, G, 2 pieces of fluorescence in the B Light body dots,
For example, it is configured such that the emission of red phosphor dots R and the emission of blue phosphor dots B can be detected. The three light receiving surfaces 5a, 5b, 5c are arranged side by side in the horizontal direction, and the interval between the adjacent light receiving surfaces 5a, 5b, 5b, 5c is 1 as shown.

3 (a) and 3 (b) show the color CRT 1 to be measured.
FIG. 4 is a signal waveform diagram showing a horizontal scanning signal and a vertical scanning signal supplied to the first embodiment.

In FIG. 3A, reference numeral 10 denotes a horizontal scanning signal, the vertical axis represents a step current value I _H of the horizontal scanning signal, and the horizontal axis represents time t. In FIG. Signal
The vertical axis represents the step current value of the vertical scanning signal..., (I-2),
(I-1), I, (I + 1),...,..., The horizontal axis is time t.

FIG. 4 is an explanatory view showing the arrangement of phosphor dots (light emitting points) on the phosphor screen formed on the face plate 1F of the color cathode ray tube 1 to be measured.

In FIG. 4, 9 (I-2), 9 (I-1), 9I,
9 (I + 1) is a step current value (I-2) of the vertical scanning signal,
The horizontal scanning lines and Pi obtained by (I-1), I and (I + 1) are horizontal scanning lines 9 (I-2) and 9 (I-
1), emission points corresponding to the phosphor dots on 9I and 9 (I + 1).

Further, FIG. 5 (a), (b), (c) is a characteristic diagram showing an example of a photoelectric conversion output obtained from three one-dimensional photoelectric conversion element 5 _1, 5 _2, 5 _3.

The In FIG. 5 (a) to (c), the vertical axis represents the three one-dimensional photoelectric conversion element 5 _1, 5 _2, 5 ₃ photoelectric conversion output obtained from (current value) I _S, the horizontal axis represents a step current value I _H of the horizontal scanning signal 10.

Here, the operation of the convergence deviation measuring apparatus according to the present embodiment will be described with reference to FIGS.

First, the processing device 6 supplies the second control signal 8a to the driving power source 2 and drives the color cathode ray tube 1 to be measured by the driving power source 2 so that the three electron guns for red, green and blue are used. Only one electron gun is operated, and an electron beam is generated from the operated electron gun.

Further, the first control signal 8b is supplied from the processing device 6 to the deflection power supply 4, and the deflection yoke 3 is driven by the deflection power supply 4 so as to sequentially turn on every horizontal scanning line as shown in FIG. A vertical scanning signal in which the magnitude of the current value varies stepwise and a horizontal scanning signal in which the magnitude varies sequentially in tens of thousands of steps for each horizontal scanning line as shown in FIG. Let it. The color cathode ray tube under test 1 sequentially scans and deflects the electron beam in the vertical and horizontal directions in accordance with the generated vertical scanning signal and horizontal scanning signal.

When the electron beam is scanned in the horizontal direction, each horizontal scanning line 9 (I-
2) Light-emitting point Pi corresponding to each phosphor dot on 9 (I-1), 9I, 9 (I + 1) emits light and emits light
Pi moves horizontally sequentially. When the movement of the light-emitting point Pi in one horizontal scanning line is completed, the light-emitting point Pi shifts to the next lower horizontal scanning line, and the light-emitting point Pi that emits light in the same manner as before is sequentially horizontal. Then, the same operation is repeated, and scanning of the electron beam is performed.

When the electron beam is scanned, the deflection yoke 3
The change in the horizontal deflection current I 3 pieces of the one-dimensional photoelectric conversion element according to _{H 5 1, 5 2, 5} 3 conversion output current I _S flowing through the red (R),
When viewing the three colors of green (G) and blue (B), for example, the distribution is as shown in FIGS. 5 (a), (b) and (c). That is, the conversion output current from the one-dimensional photoelectric conversion element 5 ₁
I _S is red (R), and combinations conversion output current I _S that corresponds to green (G) becomes a peak, one-dimensional photoelectric conversion element
Converting the output current I _S from 5 _2, green (G) and blue (B)
Peaked combinations conversion output current I _S that corresponds to the conversion output current I _S from the one-dimensional photoelectric conversion element 5 _3, the combination of the conversion output current I _S that corresponds to blue (B) and red (R) Is at its peak.

By the way, the convergence is that the electron beams of the three primary colors are concentrated on one point on the phosphor screen, but actually, they are shifted by the pitch of the minute phosphor dots. That is, if the positional deviations RG, GB, RB of the converted output current I _S of the three phosphor dots B, green phosphor dots G, and red phosphor dots R are one pitch, the convergence deviation becomes zero. . Further, if these positional shifts are equal to or greater than one pitch or equal to or less than one pitch, the convergence is shifted. The shift amount is determined easy with high accuracy from the difference between the horizontal deflection current I _H.

Next, FIG. 6 is a block diagram showing the configuration of another embodiment of the convergence deviation measuring apparatus according to the present invention, and FIG. 7 is a block diagram of the three-color phosphor dots in the embodiment shown in FIG. It is explanatory drawing which shows the arrangement | positioning state and the arrangement | positioning state of three one-dimensional photoelectric conversion elements.

This embodiment is intended is provided with a magnifying lens 5 between the measured color CRT 1 and three one-dimensional photoelectric conversion element 5 _1, 5 _2, 5 _3, other configuration is shown in Figure 1 This is the same as the embodiment.

Generally, the size of the three-color phosphor dots R, G, B is 100
.mu.m.phi., and the distance between horizontally adjacent phosphor dots is 50 .mu.m.

Therefore, the embodiment shown in FIG. 1, considering holders or the like for holding the three one-dimensional photoelectric conversion element 5 _1, 5 _2, 5 _3, the light receiving surface 5a adjacent shown in Figure 2, 5b And 5b, 5c
Interval 1 is required about 3 to 4 mm, 3 pieces of one-dimensional photoelectric conversion element 5 _1, 5 _2, 5 ₃ should be located so as to detect the two different colors at positions away from each other.

In this respect, in the embodiment shown in FIG. 6, the emission of the three-color phosphor dots R, G, and B is enlarged by the magnifying lens 5, and
Number of one-dimensional photoelectric conversion element 5 _1, 5 _2, 5 ₃ of the respective light receiving surfaces 5a, 5b,
As shown in FIG. 7, three one-dimensional photoelectric conversion elements 5 ₁ , 5 ₂ , 5 ₃ are different from each other in the vicinity as shown in FIG.
Inexpensive one-dimensional photoelectric conversion device that can detect light emission from color phosphor dots and uses optical magnification
5 _1, 5 _2, 5 ₃ of the respective light receiving surfaces 5a, 5b, it is possible Awaru the size of 5c.

〔The invention's effect〕

According to the present invention, the convergence deviation can be easily obtained using a simple configuration and an inexpensive device. Compared with the measurement accuracy of 20 to 30 times,
Convergence deviation can be measured.

In addition, according to the present invention, in principle, there is no discontinuity in the measurement sampled by the shadow mask of the color cathode ray tube, so that the speed is about 10 times and the accuracy is about 2 to 3 times as compared with ordinary digital image processing. Can be easily achieved.

Further, according to the second aspect of the present invention, the detection of light emission can be adjusted to the size of the light receiving surface of the inexpensive one-dimensional photoelectric conversion element by using the optical magnification.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a convergence deviation measuring apparatus according to the present invention, and FIG. 2 is a three-color phosphor on a part of a phosphor screen formed on a face plate of a color CRT to be measured. FIG. 3 is an explanatory diagram showing an arrangement state of dots and an arrangement state of three one-dimensional photoelectric conversion elements, FIG. 3 is a signal waveform diagram showing a horizontal scanning signal and a vertical scanning signal supplied to a color CRT to be measured, and FIG. FIG. 5 is an explanatory diagram showing an arrangement state of each phosphor dot (light emitting point) on a phosphor surface formed on a face plate of a color CRT to be measured;
FIG. 6 is a characteristic diagram showing an example of a photoelectric conversion output obtained from three one-dimensional photoelectric conversion elements. FIG. 6 is a block diagram showing a configuration of another embodiment of the convergence deviation measuring device according to the present invention. FIG. 3 is an explanatory diagram showing an arrangement state of phosphor dots of three colors and an arrangement state of three one-dimensional photoelectric conversion elements. 1 ... color CRT to be measured, 2 ... power supply device, 3 ...
... deflection yoke, 4 ... deflection power supply, 5 ... magnifying lens,
5 ₁ , 5 ₂ , 5 ₃ ... one-dimensional photoelectric conversion element, 5a, 5b, 5c ... light receiving surface, 6 ... processing device, 7 ... cathode socket, 8a ...
... 2nd control signal, 8b ... 1st control signal, 9 (I-2),
9 (I-1), 9I, 9 (I + 1) ... horizontal scanning line,
10 ... horizontal scanning signal, 11 ... vertical scanning signal.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takaaki Ishikawa 3300 Hayano, Mobara City, Chiba Prefecture Inside the Mobara Plant, Hitachi Ltd. (72) Inventor Kazuhiko Mizuno 3300 Hayano, Mobara City, Chiba Prefecture Mobara Plant, Hitachi Ltd. (72) Inventor Eiichi Nishiyama 3300 Hayano Mobara-shi, Chiba Pref. Mochi Plant, Hitachi, Ltd. (72) Inventor Taira 3300 Hayano, Mobara-shi, Chiba Pref. Mobara Plant, Hitachi (56) References JP-A-57-107678 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 17/04

Claims (2)

(57) [Claims] 1. A method of detecting emission of two primary color phosphor dots of different combinations among the three primary color phosphor dots on a phosphor screen, which are arranged horizontally on the front side of a face plate of a color cathode ray tube to be measured. Three photoelectric conversion elements for generating a conversion output, a driving power supply for sequentially generating three electron beams of the color cathode ray tube to be measured one by one, and a value that changes stepwise by vertically scanning each electron beam. A deflection power supply for supplying a vertical deflection current and a horizontal deflection current whose value changes in tens of thousands of steps at each change of the vertical deflection current for horizontal scanning to a deflection yoke mounted on the color cathode ray tube to be measured; And controlling the deflection power supply,
The above 3 wherein the conversion output of the three photoelectric conversion elements is maximum.
And a processing device for detecting the position of each electron beam as the horizontal deflection current value.
The difference between the two detected horizontal deflection current values is calculated for each of the photoelectric conversion elements, and the calculated value is compared with the corresponding two-primary-color phosphor dot pitch.
A convergence deviation measuring device for measuring a convergence deviation of an electron beam of a book. 2. The magnifying lens according to claim 1, wherein a magnifying lens is arranged between the front surface of the face plate of the color CRT to be measured and the three photoelectric conversion elements arranged horizontally. Convergence deviation measuring device.