JPH0447638A - Color adjusting apparatus of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To carry out color adjustment automatically and precisely with no need of skills by moving a color adjusting magnet in a degree calculated by a magent adjusting degree calcuating means. CONSTITUTION:An image processing apparatus 16 computes the aberration degree and the direction of each dot R and B from the center of the gravity, and computes the movement degree of a motor 12 to put R and B, one over the other, by opening and rotating the guodru-polar convergence magnet 2 based on the relation of the previously set movement of the convergence magnet 2 and the movement of electron beam, and sends the movement degree to a motor driver 13. Consequently, the quadrupolar convergence magnet 2 is opened and closed and closed and rotated each dot of R and B is overlapped in the center part of a color cathode-ray tube 1. Next, based on the position of gravity of each dot of R and B and the position of gravity of G, the aberration degree and its direction are computed and based on the relation of the movement of the convergence magnet 2 and the movement of electron beam, the movement degree of a motor 12 to open and close and rotate a hexa-polar convergence magnet 2 in order to overlap R and B with G and sends the movement degree to a motor driver 13.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a color adjustment device for a color cathode ray tube.

(Prior art) Static convergence is used in the adjustment inspection of color cathode ray tubes. As shown in FIG. 3, this static convergence causes the three electron beams of the color cathode ray tube to concentrate at the same position in the center of the fluorescent surface. In other words, R(
This is to superimpose the electron beams of red), G (green), and B (blue).

This static convergence is performed by opening and closing or rotating each convergence magnet 2 provided at the neck of the color cathode ray tube. These convergence magnets 2 include those with four magnetic poles and those with six magnetic poles.

Such static convergence is achieved by displaying the adjustment dot pattern shown in FIG. , the R and B dots are overlapped.

Next, the 6-pole convergence magnet is opened/closed and rotated so that G overlaps R and B, which overlap. Thereafter, the above adjustments are repeated to overlap R, G, and B.

However, since the above-described adjustment is performed manually by an operator, the adjustment results vary and the accuracy of adjustment is low. Further, highly accurate adjustment requires skill on the part of the operator, and furthermore, the adjustment result is affected by the magnetization error of the convergence magnet 2 and the assembly accuracy of the color cathode ray tube 1 itself.

(Problems to be Solved by the Invention) As described above, the adjustment results vary, the adjustment accuracy is low, and the operator requires skill to perform accurate adjustment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color adjusting device for a color cathode ray tube that can automatically adjust colors with high precision without requiring any skill.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a pattern display means for switching and displaying adjustment dot patterns for each color on a color cathode ray tube, and a pattern display means disposed in front of the color cathode ray tube to display an adjustment dot pattern on a color cathode ray tube. an image pickup device that images the adjustment dot pattern displayed on the screen; an image memory that stores the image signal output from the image pickup device as image data; magnet adjustment amount calculation means for storing a relationship with the movement of the beam and calculating an adjustment amount for each dot position of an adjustment dot pattern of the image data stored in the image memory from the stored relationship; The present invention is a color adjustment device for a color cathode ray tube, comprising a magnet operation means for operating a color adjustment magnet provided on the cathode ray tube by an adjustment amount calculated by the magnet adjustment amount calculation means.

(Function) By providing such means, when adjustment dot patterns are switched and displayed for each color by the pattern display means on the color cathode ray tube, these adjustment dot patterns are imaged by the imaging device, and the image data is is stored in the image memory. Then, the magnet operating means determines the position of each dot of the adjustment dot turn from the image data stored in the image memory, and adjusts the color adjustment magnet provided on the color cathode ray tube based on this dot position. Find the quantity. The method to find this adjustment amount is
The color adjustment magneto-soto is operated based on the relationship between the movement of the color-adjustment magneto-soto stored in advance and the movement of the electron beam on the screen of the color cathode ray tube.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a block diagram of a color adjustment device for a color cathode ray tube. A television power supply]0 is connected to the color cathode ray tube 1, and a predetermined voltage is applied to the electron gun. Furthermore, a pattern switch 11 is connected to the color cathode ray tube.

This pattern switch] 1 has a function of switching each color of the adjustment dot pattern displayed on the color cathode ray tube 1.

Furthermore, the convergence magnet l-2 has a motor ] 2
are connected. This motor 2 is used to open/close and rotate the sense magnet 2. Note that since the convergence magnet 2 actually has four poles and six poles, the opening/closing and rotation operations are performed by separate motors. These motors 2 are rotationally driven by a motor driver 13.

On the other hand, an industrial television (ITV) camera 14 is placed in front of the center of the panel of the color cathode ray tube 1 . This ITV camera 14 images a dot displayed at the center of the color cathode ray tube 1 and outputs the image signal. The operation of this ITV camera 14 is controlled by a camera controller 15. This camera controller]5 controls the operation of the ITV camera 14, and transmits the image signal from the ITV camera]-4 to the image processing device 1.
I am sending it to 6th.

This image processing device 16 is equipped with an image memory and has a function of digitally converting an image signal from the ITV camera 14 and storing it in the image memory as image data. Further, in the image processing device 6, the relationship between the movement of the convergence magnet 2 provided in the color cathode ray tube and the movement of the electron beam on the screen of the color cathode ray tube is set in advance. This relationship can be found as follows.

That is, the convergence magnet 2 is opened at an opening angle α. Then, the electron beam moves to position a, for example, as shown in FIG. Next, the compass sense magnet 2 is sequentially rotated at a pitch angle β while the opening angle α is maintained. As a result, the electron beam rotates to position b, position C, and so on. Next, each position a.

The rotation center P1 of the electron beam is determined from the trajectories b, c, . . . . Note that this rotation center P1 is obtained from circular approximation 2 using the least squares method. Thereafter, the rotation center of each color is found in the same manner. In this case, the center of rotation is determined by changing the opening angle α for each color.

[Image processing device] 6 calculates the position of the center of gravity of each color of the adjustment dot pattern from the image data stored in the image memory, and calculates the movement amount of the convergence magnet 2 based on the position of the center of gravity of the dot from the movement of the convergence magnet 2 and the color. It is determined from the relationship with the movement of the electron beam on the screen of the cathode ray tube 1, and this amount of movement is calculated by the motor driver 1.
It has a function to send data to 13.

Next, the operation of the apparatus configured as described above will be explained.

When a predetermined voltage is applied from the television power source 10 to the electron gun of the color cathode ray tube, and an image signal of the R adjustment dot pattern is sent from the button switch 11 to the color cathode ray tube 1, the color cathode ray tube 1 receives an R adjustment dot pattern. An adjustment pattern is displayed. ITV camera in this state] 4
takes an image of the R dot displayed at the center of the color cathode ray tube 1 and outputs the image signal. This image signal is sent to the image processing device 16 through the camera controller 5.

This image processing device 16 digitally converts the image signal and stores it in the image memory as image data.

Then, the image processing device 16 determines the position of the center of gravity of the R dot from the image data stored in the image memory.

Next, the pattern switch 11 sends an image signal of the G adjustment dot pattern to the color cathode ray tube 1.

As a result, the G adjustment pattern is displayed on the color cathode ray tube 1. In this state, the ITV camera 14 images the G dot displayed at the center of the color cathode ray tube 1 and outputs the image signal.

This image signal is sent to an image processing device 16, where it is stored in an image memory as image data. Then, the image processing device] 6 determines the position of the center of gravity of the G dot from the image data in the same manner as described above.

Furthermore, the pattern switch 11 sends the image signal of the B adjustment dot pattern to the color cathode ray tube, and causes the color cathode ray tube 1 to display the G adjustment pattern. and,
Similarly to the above, the image data of the G dot I is stored in the image memory, and the center of gravity position of this G dot is determined.

Next, the image processing device] 6 calculates the deviation amount and direction from the center of gravity of each R and B dot, and calculates the movement of the convergence magnet 2 set in advance and the movement of the electron beam on the screen of the color cathode ray tube 1. From the relationship, open/close and rotate the 4-pole convergence magnet 2 to
The amount of operation of the motor 12 that overlaps the two is determined, and this amount of operation is sent to the motor driver 13. As a result, the four-pole convergence magnet 2 opens, closes, and rotates, causing the R and B dots to overlap at the center of the color cathode ray tube 1.

Next, the image processing device 16 determines the amount and direction of deviation from the center of gravity of each of the overlapping R and B dots and the center of gravity of G, and determines the amount of deviation and direction thereof from the position of the center of gravity of each of the overlapping R and B dots, and determines the amount of deviation and direction thereof from the position of the center of gravity of each of the overlapping R and B dots, and determines the amount of deviation and the direction thereof from the position of the center of gravity of each of the overlapping R and B dots. The amount of operation of the motor 12 which opens, closes and rotates the convergence magnet 2 to overlap R, B and G is determined, and this amount of operation is sent to the motor driver 13. As a result, the six-pole convergence magnet 1-2 opens, closes, and rotates to cause the R, B, and G dots to overlap in the center of the color cathode ray tube 1. Hereafter, the above adjustment is repeated until R,'
GSB is fully overlapped.

In this example, the dot pattern for adjustment is displayed for each color on the color cathode ray tube 1, and the position of the center of gravity of each dot of the pattern for adjustment is determined from the image data. Since the amount of movement of convergence magnet 2 is determined and adjusted based on the relationship between the movement of convergence magnet 2 and the movement of the electron beam, static convergence can be performed quickly and automatically with high adjustment accuracy, resulting in J11 adjustment results. No variation occurs. Also, adjustments can be made without any skill level.

]1 Note that the present invention is not limited to the one embodiment described above, and may be modified without departing from the spirit thereof. For example, each dot of the adjustment dot pattern is not limited to a rectangular shape, but may be circular. Furthermore, the center of gravity position of each dot may be determined not by the image processing device 16, but by providing a separate device. Furthermore, a CCD camera may be used instead of the ITV camera 14. Furthermore, in this embodiment, in the image recognition device 16, the relationship between the movement of the convergence magnet 2 and the movement of the electron beam on the screen of the color cathode ray tube is set in advance, but this may be changed at any time during the adjustment stage. may be changed to a new one, or may be averaged taking new relationships into consideration.

[Effects of the Invention] As described in detail below, according to the present invention, it is possible to provide a color adjusting device for a color cathode ray tube that can automatically adjust colors with high precision without requiring any skill.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining an embodiment of a color adjustment device for a color cathode ray tube according to the present invention, in which FIG. 1 is a configuration diagram, and FIG. 2 is a diagram showing the movement of a compass magnet and an electronic FIG. 3, which is a schematic diagram showing the relationship with the movement of the beam, is a diagram for explaining the prior art. DESCRIPTION OF SYMBOLS 1... Color cathode ray tube, 2... Convergence magnet, 10... Television power supply, 11... Button switch, 12... Motor, 13... Motor driver, 14... ITV camera, ] 5... Camera controller, 16... Image processing device.

Claims (1)

[Claims] a pattern display means for switching and displaying an adjustment dot pattern for each color on a color cathode ray tube; an imaging device disposed in front of the color cathode ray tube to image the adjustment dot pattern displayed on the color cathode ray tube; and this imaging device. an image memory that stores the image signal outputted from the image data as image data, and stores the relationship between the movement of the color adjustment magnet and the movement of the electron beam on the screen of the color cathode ray tube, and uses this stored relationship to calculate the image. Magnet adjustment amount calculation means for calculating an adjustment amount for each dot position of an adjustment dot pattern of image data stored in a memory, and a color adjustment magnet provided on the color cathode ray tube calculated by the magnet adjustment amount calculation means. 1. A color adjusting device for a color cathode ray tube, characterized in that the device is equipped with a magnet operating means for operating the color by the adjusted amount.