JPS6133312B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color television adjustment device that can easily and automatically perform complicated color purity adjustment and static convergence adjustment in a color television receiver.

BACKGROUND ART Conventionally, inspection and adjustment of color television blank tubes have been carried out by visually inspecting displayed images by an expert. For example, in adjusting color purity, the positional relationship between the deflection coil and the Bracan tube is changed to create a state in which the electron beam is not projected onto the proper phosphor around the display surface, a so-called mislanding state. Then, the fluorescent state of the display screen is visually observed through a shop micro or the like, and adjustments are made so that the area where no mislanding occurs is located at the center of the display screen. This is done for each of the three primary colors of television, red (R), green (G), and blue (B), and the color purity is adjusted so that the three colors are located most centrally on average. Such color purity adjustment also requires static convergence adjustment. This static convergence adjustment involves adjusting each color so that the three primary colors overlap each other and exhibit a color mixing effect, but it is difficult to match the mislanding amount of the phosphor with the visibility amount, and the adjuster This was largely influenced by individual variation. For this reason, accurate static convergence adjustment has been extremely difficult. Furthermore, the static convergence adjustment and the color purity adjustment have mutual interference, and for this reason, it is necessary to perform the adjustment by trial and error by repeating the above-mentioned adjustment alternately. Furthermore, with such adjustment means, operator fatigue is significant, and it is extremely difficult to secure skilled adjusters, making it impossible to improve efficiency.

The present invention has been made in consideration of these circumstances, and its purpose is to eliminate the complexity of adjustment and to be able to effectively and precisely adjust the color purity and static convergence of color television. The purpose of automation of adjustment is to provide a color television adjustment device that can be expected to improve efficiency.

Hereinafter, one embodiment of the device of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of the adjustment control system. In the figure, numeral 1 indicates a color television black tube (hereinafter abbreviated as CRT) used for adjustment. This CRT1
A deflection coil 2, a static convergence adjustment magnet 3, and a color purification magnet 4 are sequentially wound around the neck portion of the magnet. These attachments are accomplished by various conventionally known means, and their explanations will be omitted here. In addition, 5R, 5G, and 5B in the figure are
With the electron gun electrode of CRT1, the three primary colors of television,
They are provided corresponding to red (R), green (G), and blue (B), respectively. Further, 6 indicates an anode. The electron gun electrodes 5R, 5G, and 5B are each independently connected to a drive circuit 7. This drive circuit 7 has the same function as a general television receiver, and receives a predetermined image pattern signal generated from an image pattern generator 8, which will be described later.
It drives CRT1. The CRT 1 then displays the predetermined image pattern on its display surface.

On the other hand, near the image display surface 1a of the CRT 1, first photoelectric detectors 1 are arranged opposite to the display surface 1a.
0,111 and a second photoelectric detector 9 are arranged. These photoelectric detectors 9, 10, 11 are
As shown in the figure, that is, the first photodetector 9 is located approximately in the center of the display surface 1a, and the second photodetector 1
0 and 11 are arranged at symmetrical positions on the periphery of the display surface 1a with the second photoelectric detector 9 in the center. As will be described later, the photoelectric detector 9 is made up of an array in which light-receiving elements are arranged two-dimensionally, and each of the photoelectric detectors 10 and 11 is made up of an array in which light-receiving elements are arranged one-dimensionally. Detection information obtained by these detectors 9, 10, and 11 is input to a determination circuit 12, which is composed of, for example, a binarization circuit. The information detected in this manner is input to an arithmetic circuit 14 equipped with a memory 13, where predetermined arithmetic operations are performed. This arithmetic circuit 14 performs color purity detection, static convergence amount detection, etc. based on the input detection information. 15,1 in the figure
Reference numerals 6 and 17 denote a deflection coil position adjustment mechanism, a static convergence adjustment mechanism, and a color purity adjustment mechanism, respectively, which are driven by the calculation output of the calculation circuit 14 and whose operation is controlled. These adjustment mechanisms 1
Reference numerals 5, 16, and 17 each include, for example, a pulse motor that positions and moves each adjustment member. The deflection coil position adjustment mechanism 15 is a CRT1
Adjust the front-rear positional relationship of the deflection coil 2 with respect to the
This sets the deflection width of the electron beam emitted from the electron gun. The static convergence adjustment mechanism 16 rotates the static convergence magnet 3. Further, the color purity adjustment mechanism 17 moves and sets the position of the color purity magnet 4. With the apparatus configured in this manner, color purity adjustment and static convergence adjustment of color television are performed as described below.

By the way, CRT1 used for such adjustment
As shown in FIG. 3, for example, three types of phosphors, blue (B), green (G), and red (R), are sequentially and alternately arranged on the display surface 1a. These phosphors are R,
G and B form a set, and as shown in FIG. 4, for example, they are irradiated with electron beams independently from the three independent electron guns, and emit unique fluorescence. On the displayed image, a predetermined color is formed by the mixing effect of the three types of fluorescent light. Note that the color tone is set by the intensity of the electron beam to each phosphor. Here, if a deviation occurs between the irradiated electron beam and the arranged phosphors as shown in Figure 5, two phosphors will be excited simultaneously by one electron beam. become. This is the aforementioned mislanding state. In FIGS. 4 and 5, the electron beam irradiation area is shown surrounded by broken lines.

Now, the adjustment effect will be explained next. First, the image pattern generator 8 is activated to form a green monochrome screen. In this case, this can be achieved by driving only the electron gun 5G for green display. At this time, the deflection coil position adjustment mechanism 15 is activated.
The position of the deflection coil 2 relative to the CRT 1 is moved to create the aforementioned mislanding condition. As a result, the center of the displayed image is displayed in green, the left side is displayed in blue, and the right side is displayed in red, as shown in FIG. In other words, the electron beam emitted from the electron gun 5G excites the blue (B) phosphor on the left side of the display surface 1a, excites the phosphor (R) on the right side, and only in the center part excites the phosphor (R). A mislanding state is formed that excites the phosphor (G). In such a state, the first photoelectric detector 1 in which the above-mentioned light receiving elements are arranged one-dimensionally
0 and 11 are positioned on the change plane of the fluorescent region as shown by arrows A ₁ and A ₂ in FIG. 6, respectively. In the fluorescent region _A1 , the single electron beam shifts to the left and irradiates a portion of the phosphor G and a portion of the phosphor B. In addition, in the fluorescent region _A2 , the electron beam shifts in the right r direction and irradiates a portion of the fluorescent material G and a portion of the fluorescent material R. This is due to mislanding caused by a deviation in the deflection angle caused by the deflection coil 2. Therefore, the photoelectric detector 10,
11 for measurement and detection. When performing this detection, it is possible to perform the detection using the scanning line XX or the scanning line YY for the arranged phosphors R, G, and B, as shown in FIG. 7a. Above X
-X crosses approximately the center of the phosphors R, G, and B. In this case, a detection signal is obtained corresponding to the light intensity as shown in FIG. However, Y-
When the fluorescent bodies R, G, and B are detected in a half-broken state as shown by Y, the detected light intensity is low, and when the waveform is shaped through the binarization circuit, the pulse width is
Errors occur as shown in Pw ₁ and Pw ₂ . To deal with this, by displacing the positions of the photoelectric detectors 10 and 11 in the vertical direction in the figure, the detection area
- You can do something like X. This can be achieved, for example, by adjusting the detection pulse width Pw to be maximum. After that, when looking at the fluorescent state in the regions A ₁ and A ₂ where mislanding occurred, in the case of region A ₁ , the fluorescent portion shifts as shown in FIG. 8a, and the detected pulse signal is the same figure b
It is shown as follows. Further, in an area A2 located symmetrically on the display surface _1a with respect to the area _A1, the fluorescent portion is shifted as shown in FIG. 8c. Therefore, this detection pulse signal becomes as shown in d of the figure. Here, if we focus on the excitation width of the phosphor G, the widths are indicated by wl and wr, respectively. The widths Wl and Wr should be equal under the condition that the color purity is accurately adjusted, and therefore, the difference (wl−wr) indicates the amount of shift in color purity. Therefore, the fluorescence widths wlG and WrG in the monochromatic image line (G) are detected and inputted to the arithmetic circuit 14, and the memory 13
temporarily memorized. Thereafter, in this state, the image pattern generator 8 is switched, and the fluorescence widths WlR and WrR in the monochromatic image red (R) are measured and stored in the memory 13. In addition, the fluorescent widths WlB and WrB in the monochromatic image blue (B) are measured in the same manner. These measurement results WlG, WrG, WlR, WrR,
Based on WlB and WrB, the arithmetic circuit 14 performs the following arithmetic processing.

N=(WlG+WlR+WlB)-(WrG+WrR+
WrB)/6×K In the formula, N is a correction amount and K is a conversion constant.
The correction amount N is the average value of the amount of deviation of each color R, G, and B, and therefore corresponds to the entire deviation. Then, the color purity adjustment mechanism 17 is operated based on the calculation result by the arithmetic circuit 14,
Adjust the color purity magnet 4. This adjustment is performed by feedback control until the calculated value becomes zero. Thus, the color purity is adjusted here, and then the deflection coil position adjustment mechanism 15 is operated to return the deflection yoke 2 to its original position, and the adjustment is completed.

Next, static convergence adjustment is performed as follows. That is, this time, the image pattern generator 8 is activated to display a white dot pattern as an image. Focusing on one dot in the white dot pattern above, three electron guns 5R, 5G,
This corresponds to the fact that the electron gun beams respectively irradiated from 5B are equally irradiated onto a set of phosphors R, G, and B, and exhibit fluorescence at the same level.
In this case, if there is a shift in static convergence,
Each electron beam illuminates a different set of phosphors, causing the fluorescent phosphors to be dispersed. Therefore, the second photoelectric detector 9 is located at the center of the display surface 1a to detect the positional shift of the display phosphor. That is, the photoelectric detector 9 is composed of a two-dimensional array of light-receiving elements as described above, and detects the coordinate position of the light-receiving element in correspondence with each light-receiving element. Therefore, if we now operate only the electron gun 5G and detect the fluorescent element position (XG, YG)
can be obtained and stored in the memory 13. Similarly, only the electron guns 5R and 5B are operated to obtain (XR, YR) and (XB, YB), respectively, and are stored in the memory 13. Of course, this detection may be performed simultaneously. In this way, display position information for each color is obtained, for example, as shown in FIG. 9.

Here, the deviation of each display position △X ₁ = K ₁ (XR-XG) △X ₂ = K ₂ (XB-XG) △Y ₁ = K ₃ (YR-YG) △Y ₂ = K ₄ (YB-YG) ) indicate the amount of static convergence deviation. Then, the static convergence adjustment mechanism 16 is operated using the above deviation amount to adjust the position of the static convergence yoke 3 (the position of the static convergence magnet). This adjustment is feedback-controlled so that the amount of deviation is 0, that is, the three color display positions match. In this case, each of the display positions does not match completely because each phosphor is different, but for example, the position detection quantization accuracy of the photoelectric detector 9 may be set to one set of phosphors. can be equivalently reached by . Thus, by setting the static convergence deviation to zero, accurate adjustment of static convergence is achieved.

By the way, the above-described adjustment of color purity and adjustment of static convergence have a strong correlation with each other and interfere with each other. Therefore, the adjustment of the static convergence causes a deviation in the previously adjusted color purity.
Therefore, the adjustment of color purity and the adjustment of static convergence are repeated several times alternately, and the adjustment is completed after confirming that both have been properly adjusted.

According to the device of the present invention, the predetermined display patterns are detected by the photoelectric detectors 9, 10, and 11, respectively, and each adjustment mechanism is activated based on the amount of deviation calculated by the arithmetic circuit 14 to perform feedback control. In particular, adjustment of color purity is performed by detecting the fluorescence width of each monochromatic light with respect to the phosphor, and then binarizing this to find the pulse width according to the fluorescence width. The amount of deviation can be detected reliably, and its processing is simple. Therefore, there is no need for a skilled adjuster as in the prior art, and the adjustment state does not change due to individual differences among the adjusters. Therefore, it is possible to automate and save labor in the adjustment and inspection process in television manufacturing, and to improve production efficiency. Further, as described above, accurate adjustment can be easily performed, and there is no need for the complexity of the conventional method. On top of that,
During adjustment, there is no need to directly touch the adjustment mechanism, so there is no danger from the television's high-voltage circuit, making it extremely safe. Therefore, effective adjustment with sufficient safety is possible.

Note that the present invention is not limited to the above embodiments. Further, the CRT itself is not limited to having a strip-shaped phosphor arrangement, and can be similarly applied to various forms. Furthermore, the configuration of the photoelectric detector can be determined according to its specifications, and ITV
Of course, you may also use the following. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a schematic diagram, Fig. 2 is a diagram showing the arrangement of a photoelectric detector, and Fig. 3 is a diagram showing the phosphor arrangement of a Bulacan tube.
Figure 4 is a diagram showing the relationship between the phosphor and the electron beam;
Fig. 5 is a diagram showing the relationship between the phosphor and the electron beam in the mislanding state, Fig. 6 is a diagram showing the display image in the mislanding state, Fig. 7 is a diagram showing the detection position and its effect, and Fig. 8 is a diagram showing the display image in the mislanding state. The figure is a diagram for explaining color purity adjustment, and FIG. 9 is a diagram for explaining static convergence adjustment. 1...Color television tube (CRT),
2... Deflection yoke, 3... Static convergence yoke,
4... Color purification magnet, 8... Image pattern generator, 9,
10, 11...Photoelectric detector, 14...Arithmetic circuit, 15
... Deflection coil position adjustment mechanism, 16... Static convergence adjustment mechanism, 17... Color purity adjustment mechanism.

Claims (1)

[Scope of Claims] 1. An image pattern generator that activates an electron gun of a color television blank tube to display a predetermined image pattern, and a mislanding device that moves the position of a deflection coil wound around the blank tube. a deflection coil position adjustment mechanism for creating a state, and a first device for detecting the fluorescence width of the electron beam for each of the three monochromatic phosphors in the mislanding state, which are installed opposite to each other on the left and right peripheral portions of the display surface of the Bulacan tube. a photoelectric detector; a determination circuit that binarizes the detection signal output from the first photoelectric detector to create a detection pulse corresponding to the fluorescence width; and a determination circuit that generates a detection pulse corresponding to the fluorescence width. a calculating means for determining the amount of deviation in color purity between the left and right sides of the display surface of the Bulacan tube for each of the three monochromatic lights, and calculating a correction amount for the overall deviation amount from each of the deviation amounts; A color purity adjustment mechanism that adjusts the position of a color purification magnet wound around the tube, and after the adjustment of this color purity adjustment mechanism, a second photoelectric detector installed opposite to the center of the display surface of the Bulacan tube. Static convergence adjustment that detects the display position of each monochromatic light of the dot pattern displayed by the image pattern generator, calculates the amount of deviation from the difference between these display positions, and adjusts the convergence adjustment yoke wound around the Bracan tube. A color television adjustment device characterized by comprising a mechanism. 2. A color television adjustment device according to claim 1, wherein the first photoelectric detector comprises a one-dimensionally arranged photodetection array. 3. The color television adjustment device according to claim 1, wherein the second photoelectric detector comprises a two-dimensionally arranged photodetection array.