JPS6055792A - Dynamic convergence device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a dynamic convergence device for correcting color shift in a high-definition display color brown'a display device. This invention relates to a dynamic convergence device that can be set digitally from the outside as an I change.

[Background of the invention]

A color-paired display device as a monitor device generally has three 1D units corresponding to red (normal), green (G), and back (13).
Lask scan circuit for horizontally and vertically scanning electron beams from child guns and these electron guns, shadow mask for converting R, G, and B electron beams into light, and fluorescent light. It basically consists of a display surface, etc., but converse adjustment is required to obtain images without color shift. On a fluorescent display screen, each electron beam must converge on one point over the entire raster scan range, and if the intensity of each electron beam is the same, it is desirable to display it as a white point. be. However, in reality, the light emitting points do not match due to mechanical dimensional errors, distortion of the sun's magnetic field, etc., resulting in film color shift.

For this reason, static convergence was conventionally employed, in which permanent magnets were assembled as shown in Figures 1 (a) to Cd), and the color shift was corrected by relatively correcting the light, G, and B beams. Corrections have been made. However, although it is possible to perform silent convergence adjustment using permanent magnets, it is difficult to correct minute color shifts over the entire fluorescent display surface due to the structure of the cathode ray tube. Therefore, if it is necessary to correct a color shift of less than ll111, a magnetic field as shown in 111(a) to 111(d) is generated by an electromagnetic magnet using a coil, and the laskscan position [K corresponds to Dynamic convergence correction is performed by varying the current. By the way, in the past, when performing static convergence correction, an electromagnetic magnet was used instead of a permanent magnet, and an analog method was used in combination with a submersible grinder or the like as a means for generating correction circulation to the electromagnetic magnet. However, with the advancement of digital technology, in recent years, digital dynamic convergence devices have been proposed in which correction currents are digitally recorded in correspondence with rask scan positions.

FIG. 2 shows a schematic configuration of the digital dynamic convergence device. In the digital dynamic convergence device 6, the color misregistration correction data is stored in a correction data memory 62, and the color misregistration correction data read out from the correction data memory 62 in a predetermined manner is converted into a color mismatch correction data via a D/A converter 63. The color shift correction coil 3 attached to the neck of the tube 5 is driven. As shown in FIG. 3(a), the correction data memory 62 stores zones 52 obtained by horizontally and vertically dividing the entire 2-star scan range as the display@51.
Color misregistration correction data is recorded corresponding to each. Therefore, if the horizontal address (I(A) and vertical address (VA) assigned to each seat 752 are generated by the t-zone address generator 61 based on the synchronization signal from the diversion circuit 2, then the actual scanning The color misregistration correction data corresponding to the zone is read out from the correction data memory 62 and then applied to the color misregistration correction coil 3, so that the color misregistration correction can be adjusted by a for each zone 52.

By the way, the setting of color misregistration correction data in the correction data memory 62 is performed by the correction data input circuit 64. The color shift displayed on the display screen 51 is detected for each screen 752 by visual inspection, optical means, or mechanical means, but if a color shift is detected, the color shift is corrected according to the color shift. It is sufficient to set the data in the correction data memory 62 for each zone 52 via the correction data input circuit 64. For example, the third
As shown in figure (a), color shift in the center vertical direction (displayed by diagonal lines)
If detected, color misregistration correction data can be stored in the manner shown in FIG. 3(b), thereby making it possible to correct color misregistration in the entire two-stas scan range. Therefore, in general, the larger the number of zone divisions and the larger the number of bits of color misregistration correction data, the more precisely it becomes possible to correct color misregistration.

In addition, the reference numeral 1.4 in FIG. 2 indicates the image amplification circuit and cabinet coil, respectively.

In this way, color shift is determined by mechanical dimensional errors of Braun'11 and distortion of the deflection magnetic field, so color shift correction data differs from device to device even for color cathode ray tube display devices with the same specifications. Normally, it is necessary to set color misregistration correction data for each device using a correction data input circuit. However, once the color misregistration correction data is set, mechanical dimensional errors and fluctuations in internal magnetic elevation distortion over time can be ignored with respect to the color misregistration specifications, so resetting the color misregistration correction data is not necessary. considered unnecessary. That is, since the correction data input circuit is for adjustment during device manufacture and is unnecessary for the user, the dynamic combination device can be constructed economically.

By the way, as the specifications of color cathode ray tubes become higher in definition, the actual situation is that the influence of the earth's magnetism has become unavoidable. For example, if we assume that a color shift display device is shipped to the United States with color misregistration correction data set in Japan, even though no color misregistration occurred in Japan, in the United States it would be 0.1~ A color shift of 0.3 order occurs. This is because the strength of the earth's magnetic field is not the same in different parts of the world, but differs, and differences in the strength of the earth's magnetic field depending on the location and direction of the world affect the color shift. Since the strength of the geomagnetic field differs, for example, from 320 Gauss in Tokyo to 510 Gauss in New York, it is necessary to set the color shift correction data again. Especially recently, for example, OEM products produced in Japan
It is not uncommon for products to be distributed by a U.S. corporation and shipped to various parts of the world. Considering this situation, it is recommended that the dynamic convergence device include a fixed correction data input circuit. It is possible that

Here, the method of setting color fade 1 (0 positive data) in the oil stop data memory will be described in general with reference to FIG. 4 as follows.

That is, FIG. 4 shows a dynamic convergence device including n (1 positive data input circuit 64) i as a microcomputer consisting of a microprocessor 64, a program memory 642, and a console dW 643. However, when setting the color misregistration correction data, the microprocessor 641, fJk, and correction zone are sequentially specified. Every time a zone to be corrected is specified, the color shift tL of that zone is visually detected, and the color shift correction data for the detected color shift is inputted by the console device FLT 64311C. is written by the microprocessor 641 into the address corresponding to the seventh zone in the correction data memory 62.

Therefore, it is easy to consider that when resetting the color shift correction data in the correction data memory, it can be done as described above. However, resetting in this manner requires frequent setting operations. Another possible resetting method is to correct the already set correction data based on regional geomagnetic correction data.

Since the influence of geomagnetism does not change within a certain area on the earth and the geomagnetic correction data for each region is also known in advance, a plurality of geomagnetic correction data for each region 645 are stored in the program memory 642 as shown in FIG. At the very least, the second feature is to use the switch 644 to select geomagnetic correction data corresponding to the area where the cathode ray tube display device is actually installed. If geomagnetic correction data corresponding to the region is selected, the microprocessor 641 adds the correction data to each of the preset correction data, thereby resetting the correction data.

Therefore, although this method simplifies the resetting operation, as with the former method, a correction data input circuit comprising a microprocessor or the like is inevitably required.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dynamic convergence device in which the configuration and setting operations are simple and data for color shift correction can be arbitrarily set externally in accordance with the area.

[Summary of the invention]

For this purpose, the present invention provides, in addition to the memory for storing reference color shift correction data, a memory for storing regional color shift correction data in which regional color shift correction data can be arbitrarily selected from an external source. This is what was done. When the reference color misregistration correction data is selected and corrected using the color misregistration correction data for each area, color misregistration correction data suitable for the region can be easily obtained.

[Embodiments of the invention]

The present invention will be explained below with reference to FIG.

FIG. 6 shows the configuration of an example of a dynamic convergence device according to the present invention, together with a color cathode ray tube and the like. As shown in the figure, the reference color shift correction data is stored in advance in the correction data memory 62 corresponding to the zones.
Regional color shift, f+U positive data memory 6 in which color shift correction data related to geomagnetism for each region is stored in advance.
6 will be provided. The regional color shift correction data in the regional color shift correction data memory 66 is selected by switching and selecting the switch 67 depending on the region where the color cathode ray tube display device is installed. Therefore, when setting the switch 67 appropriately, the reference color shift oil stop data corresponding to the zone read from the oil stop data memory 62 corresponds to the zone of the regional color shift correction data selected by the adder 65. This signal is added to that of , and is then applied to the color shift correction coil 3 via the D/A converter 63 . This enables high-definition display without color shift no matter where the color cathode ray tube display device is installed. However, if the color cathode ray tube display device is installed in the same area as the area where the reference color deviation correction data is set, or if it is installed in an area with the same geomagnetic strength as that area, the regional color deviation correction data will be used. Of course, the memory 66- and the adder 65 are unnecessary. However, if it is not known in advance in what area the installation will be installed and there is a possibility that it will be installed in an area where the geomagnetic strength is not the same, then the A color shift correction data memory 66 is required. This Kamodai geomagnetic field (
The color shift correction data for each region is unchanged within the region and is known in advance, so there is no need to change it once it is set for each region. In this example, since the selected regional color shift correction data is read out zone-wise, the regional color shift oil stopper data memory 66 is constructed as a non-volatile semiconductor memory. However, if the regional color shift correction data is set as common to all zones, the number of bits can be reduced, so it is also conceivable to mechanically form tt'.

[Effects of V6 Brightness] As explained above, the present invention allows preset regional color shift correction data to be selected from the outside according to the region, and adjusts the reference color based on the selected regional color shift correction data. This is to correct the deviation correction data. Therefore, according to the present invention, there is an effect that the configuration and setting operations are simplified, and color shift correction data can be arbitrarily set according to the region from the outside.

[Brief explanation of drawings]

1(a) to 1(d) are diagrams for explaining static convergence correction using a combination of permanent magnets; FIG. 2 is a diagram mainly showing the general configuration of a digital dynamic convergence device according to the prior art; 3
Figures (a) and (b) are diagrams for explaining the correction data memory and the correction data stored therein in the configuration, and Figure 4 is a diagram showing the configuration of the correction data input circuit in the same configuration. Figure 5 shows color shift considering regional color shift correction data. FIG. 6 is a diagram for explaining a method of resetting ili positive data, and is a diagram showing the configuration of an example of a dynamic convergence device according to the present invention. 62... Correction data memory, 63... D/A converter, 65... Adder, 66 Region-specific color shift correction data mesori, 67... Switch. Agent Patent Attorney Masashi Akimoto Jissan 10 ((:L) (b) (C) (d) Figure 2, Ward 3 (Ka) (shi) Figure 40, Figure 5M

Claims (1)

[Claims] 1. Divide the color brown display screen into distinct zones, synchronize with the zone that is currently being scanned in 2-star mode, read out the color shift correction data corresponding to the zone (from the correction data memory), perform D/A conversion, and then perform color This is a dynamic convergence device that drives a color shift correction coil attached to the neck of the cathode ray tube, and in addition to the I+M positive data memory in which reference color shift correction data is stored in advance, regional colors related to geomagnetism are used. A regional color shift correction data memory in which shift correction data is stored in advance is set up as a town where the regional color shift correction data is selectively read out externally, and selectively read out from the regional color shift correction data memory. A configuration for correcting reference color misregistration data from a correction data memory using regional color misregistration correction data obtained by
- Characteristic dynamic convergence device.