JPS59111474A - Dynamic convergence device - Google Patents

Abstract

PURPOSE:To save the trouble adjusting the correcting amount by storing a color shift correcting data and calculating the correcting amount with estimate when the circuit state is fluctuated so as to update the data. CONSTITUTION:A digital dynamic convergence (DDC) has a correcting memory 2. When horizontal zone split number is (8) and a vertical raster number is (512), the memory 2 requires an address of 4K. Suppose that the scan width is decreased to 1/2 without changing the number of raster lines in this state. When the correcting amount of the DDC remains the same, over-correcting is produced. Further, when the number of raster lines is decreased while keeping the scan area, the correcting amount is deficient. Thus, when the raster scanning frequency or the raster size is changed, the suitable correction is attained by rewriting the content of the memory 2 according to the prescribed algorithm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a dynamic convergence device that corrects color shift in a color cathode ray tube, and particularly to a digital dynamic convergence device that digitally stores color shift correction data.

[Prior art]

Color brown'g display devices such as TV receivers are red,
Three electron guns for green and h' (hereinafter abbreviated as R, G, and B), a raster scan circuit that scans the electron beams horizontally and vertically, and corresponding R, G, and Bm electron beams.
It consists of a shadow mask for converting this light into light and the basic elements of a fluorescent display screen. Each electron beam on the fluorescent display screen is
When the beams converge at one point and each beam has the same intensity, it is preferable to form a single white point, but in reality, due to mechanical dimensional errors, distortion of the deflection magnetic field, etc., the light emitting points do not coincide, Color shifts occur in several birds. In order to correct such color shift, conventionally, four magnets as shown in Figure 1 (4) to 0 are combined to deflect the R, G, and B electron beams in a 71U pairwise manner. Static convergence correction is used to correct the deviation.

With this water-immersed magnet, it is still difficult to correct the f# axis I color shift over the entire surface of the phosphor screen, and if a color shift of less than 1 degree is required, a magnetic field equivalent to that shown in Figure 1 should be applied by a coil. It is generated by an electromagnetic magnet, and uses Guinamitsu convergence correction, which changes the current flowing through the coil in response to Rusk Scan.

Traditionally, as a means of generating a correction current value for this dynamic convergence, an analog system using a combination of variable resistors, etc. has been exclusively used, but in recent years, with the advancement of digital technology, it has become possible to generate a correction current value digitally. Digital dynamic convergence devices with storage have been proposed.

FIG. 2 shows a block diagram of the principle of digital dynamic convergence (hereinafter abbreviated as DDC). That is, in the DDC device 10, the color shift correction data is stored in the correction data memory 2, the data is converted into an analog value by the D/A converter 3, and the color shift correction coil 1 is moved slightly.

As shown in FIG. 3(a), the correction data memory 2 is allocated with leased land corresponding to zones obtained by dividing the rask scan I plane into several horizontal one-angle sections, and the zone address generator 4 is , generates a zone address corresponding to the rask scan based on the synchronization signal from the deflection circuit 20, and continuously outputs correction data 'c corresponding to the corresponding zone from the correction data memory 2, correction data input. The section is for inputting specific data into the correction data memory 2.

For example, when there is a color shift in the center vertical direction as shown in FIG. 3(a), if the correction data memory 2 stores the data shown in FIG. , color shift can be corrected.

It is clear that by making the zone division more fine-grained and increasing the number of pits for storing correction data, it is possible to perform color shift correction in a more dense manner.

By the way, from the standpoint of using this DDC, it is important that the operation of inputting correction data is simplified and, furthermore, unnecessary. For end users, atonal fireflies are desired, but conventional DDCs have the following problems and cannot be realized. In other words, in general display applications other than television, it is true that the scan frequency or scan size differs for each user, but when the horizontal or vertical scan frequency changes,
When the scan size changes, there is a problem in that even if data that has been correctly corrected previously is stored, correct color shift correction cannot be performed with the same data.

[Purpose of the invention]

An object of the present invention is to provide a highly practical DDC device that enables no adjustment when changing the scan frequency or scan size.

[Summary of the invention]

The inventors focused on the fact that the amount of color shift in the Cassie cathode ray tube mainly depends on the physical position of the displayed snow surface, and that the amount that depends on the rusk scan size or scan frequency is extremely small. A new means of importing parameters for associating the scan zone with the physical position I'dt on the display surface has been added, and when storing the desired adjustment data, all of these parameters can be saved at the same time. Make one sense,
If there are any changes in these parameters, we have added a means to automatically recalculate the correction data so that the physical positional relationship between the initial data and the display screen is maintained even during the rask scan using the cultivation parameters. scan frequency, or
Eliminates the need to readjust correction data when changing scan size.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG.

The DDCIO that drives the color shift correction coil 1 has a correction data memory 2. D/A converter 3. It consists of a zone address generator 4, a correction data manual section 11, and the like. The correction data input section 11 includes a keyboard 13, a rask size detection section 15, a microcomputer 12, and the like.

The zone address generator 4 receives from the deflection circuit 20,
The correction data memory 2 is for generating a zone address in response to a signal synchronized with raster scanning, and the correction data memory 2 is for storing correction data corresponding to the zone address. However, among the data areas, the flag bit area is an auxiliary area used to assist correction data input operations.
This is to perform 1)/A conversion on the correction data read out from the color shift correction coil 1 to operate the color shift correction coil 1.

The address multiplexer 6 and the data register 7 connect the correction data memory 2 to the correction data input section,
This is a changeover switch for storing and reproducing data.

The zone cursor generator 5 determines in which zone the correction data is entered when the correction data is manually created, and
This is to display and output on the U screen how the color shift is based on the input correction data, generate a cursor signal to notify the operator, and drive the video amplifier.

The keyboard 13 is an operation console for inputting correction data, and can at least select and command the following functions. In other words, ■ A1j Specifying the zone address where positive data is to be input (hereinafter, moving the zone cursor to the left or right) ■ Inputting correction data (correction direction vector) ■ Start and end of correction data input operation Raster size detection section 15 is an A/D converter that applies voltages proportional to the horizontal and vertical scan widths in order to correlate the raster scanning area with the physical positional relationship of the screen surface.
This is for converting and importing the correction data into the human resources department. The microcomputer performs the correction data input operation f.
■Keyboard 13 is for ijlJtll.
The correction animator input operation command given from is executed, and a program is incorporated to re-edit the correction data when the raster scan parameters (frequency or size) change.

The memory 14 is a nonvolatile memory for storing raster scan parameters, correction data of the correction data memory 2, and the like.

FIG. 5 shows a detailed embodiment of the zone address generator 4. In FIG.

In this embodiment, the number of zone divisions in the horizontal direction is 8, and the number of vertical rasters (number of social zones) is up to 512. Therefore, the correction data memory 2 has an address of 4. ).

First, the horizontal zone address generation section has PLL 41 and 1
It consists of a /8 counter 42 and divides the interval of horizontal synchronization H from the deflection circuit 20 into 178, thereby dividing the raster scan area into 1/8. (Since the M density has a blanking period, it is not possible to display all eight divisions, but in order to make the explanation easier to understand, the following explanation will ignore the blanking period.)

Next, the vertical zone address generation section is assumed to simply store J2 zones for each horizontal scan, and 11
It consists of 512 counters, and this counter is connected to the deflection circuit 2.
Count the horizontal synchronization signal H from 0, and count the horizontal synchronization signal V
When the value is reached, it is reset to 0. Therefore, in this zone address generator, the number of vertical zone divisions changes depending on the horizontal/vertical scan frequency.

The color misregistration correction operation of the DDC device composed of these pieces of hardware will be briefly described.

First, we will explain the operation due to autopsy waves or the operation when the raster scan/size changes, taking vertical direction correction as an example.

In Figure 6, when inputting correction data, Figure 6 (a)
Assume that the color shift 4 has been corrected in the raster main text 512 as shown in FIG.

On the other hand, if the number of rasters remains unchanged and the scan width can be set to 172 as shown in Figure 6(b), the raster scan area will be reduced to the center of the display screen, and the correction data will be If left as is, overcorrection will occur, and the difference will appear as color shift.

Therefore, in order to eliminate the color shift, as shown in Figure 6(b)', the data of the original 128# ground should be used as the data of the 04 ground,
(abbreviated as (0)←(256)), same ((256)←(
256), (512)←(384), the data in the correction data memory 2 may be edited again.

The address for this edit is 256 tongue area (center space)
If the raster size ratio is known for all standards, it becomes unnecessary to manually manipulate new correction data.

Therefore, when the microcomputer 12 receives a command from the keyboard 13 to complete the pre-stop data input operation, the microcomputer 12 stores the output data of the raster size detector 15 in the memory 14, and roughly outputs the data from the raster size detector 15. It patrols to see if there is a change in the data, and when a change is detected, it operates to change the correction data in the correction data memory 2 using the algorithm described above.

Next, as shown in Figures 6(a) to (C), if the number of rasters is set to 256 (assuming that the raster scan size is kept constant), insufficient correction will be made if the original correction data remains unchanged. The difference then appears as a color shift.

Therefore, in order to eliminate color shift, change the correction data to (0)←(0
), (128)←(256), (256)←(51
If you re-edit as in 2), there is no need to input numerous correction data.

In editing this, the necessary 'ITt' resistance is expressed by Rusk, and the sentiment can be read in the following steps. First, all flag bits in the correction data memory 2 are reset to 0". For all addresses specified in the zone address generator, set the flag bits to 1".
Wow, let me write it down. This operation involves switching the input of the address multiplexer 60 and switching to the zone address 4 side, setting 1" in the data register 7, and issuing a write command to the correction data memory 2 for a certain period of time longer than the running time for one frame. If you wait, it will be executed. After that, set the flag bit to '1'''
By checking the address where is set, the zone address generator can detect which range the zone address generator has transitioned to. Since the correction data must not be destroyed by this operation, writing of the flag bit in the correction data memory 2 is configured so that it can be specified independently of the correction data section.

When there is a command from the keyboard to complete the correction input operation, this raster number data is stored in the memory 14, and further, it is checked whether or not there is a change in the number of raster lines, and when a change '(i-) is detected, the above-mentioned A series of operations for editing the correction data using an algorithm is also executed by the program of the microcomputer 12.In this way, once all the color shift corrections shown in FIG. 6(a) are performed, the subsequent scan frequency or , the adjustment of color shift correction due to the history of raster size changes is automatically performed within the DDC device.

Next, a method of inputting color blur correction data will be described.

When the microcomputer 12 receives a command to input color shift correction data from the keyboard 13, the microcomputer 12 performs control for the following correction data input operation.

The flag bit of the correction data memory 12 is used as zone cursor display 1'g information for correction. That is, the zone cursor generator 5 is configured to output a pulse signal that displays a spot point at the center of the zone when this flag bit is "1"; (7) Excite the R, G, and Btjf child guns 3. Thus, spots are displayed on the surface of the display material. The writing of the flag bit in the correction data memory 2 is performed directly by the microcomputer 12 so that the flag bit is written at the address l'''. Look at the zone cursor switch, the spot positions of the three colors LG and B are shifted (color shift), positive ν, keyboard 1
From 3, data in + positive command (correction direction) is given. The microcomputer 12 updates the correction data at the address in the correction data memory 2 in accordance with the command. At this time, when the microcomputer 12 accesses the correction data memory 2, the blanking period itJ is
] Other than that, the addresses of the correction data memory 2 are updated according to the zone address generator 4, and the display screen does not change when new data is updated,
The data stop command can be continued until the R, G, 83 color dots match. - When the three-color dots match and the correction of the zone is completed, the operator instructs the movement of the zone cursor from the keyboard 13 and starts the correction of the next zone. Manual correction does not necessarily need to be performed for all zones; if you apply corrections at regular intervals and input the interpolated data for the rest, the oil stop operation can be shortened. Preferably, the microcomputer 12 is preprogrammed with the intermittent movement. When performing this upward movement, it is necessary to insert interpolated data when receiving a correction end command from the keyboard 13.

In the figure, 7 is a data register, 21 is a deflection coil, and 4 is a data register.
3 is a counter that divides the frequency of the human input signal to 1/512.

〔Effect of the invention〕

According to the present invention, when the raster skit frequency or the raster size is changed, the color shift correction data can be automatically reset, thereby eliminating the need for 1, S-) key 1Y operations.

[Brief explanation of the drawing]

Figure 11 (A~0 is a schematic diagram of the principle of the uninvented team, Figure 2 is a conventional block diagram, Figures 31d(a) and (b) are explanatory diagrams of conventional operation, and Figure 4 is the overall structure of the present invention. Block diagram, Fig. 5 is a partial block diagram of the present invention, Fig. 6 (a) (b) (C) (
L+') (C is an explanatory diagram of the operation of the present invention. 1... Correction coil, 2... Correction data memory, 3-
...D/A converter, 4...Zone address generator, 12...Microcomputer, 13...Keyboard, 15...Raster size detection unit. Figure 1 (A)
(B) (C,) (f)) Brush 2 drawing 3rd (a)
(S) Figure 4] Kaya 5th item 61 yen 1 (Reno CC) (C')

Claims (1)

[Scope of Claims] 1. A color shift correction coil for correcting color shift of a cathode ray tube, a memory for digitally storing the correction amount, and a method from the memory in synchronization with raster scanning.
a zone address generator that associates the raster scan position with a memory address; and a zone address generator that converts data read from the memory address assigned by the zone address generator into an analog quantity and drives the color misregistration correction coil to drive the color shift correction coil. In a dynamic convergence device for correcting color shift of a cathode ray tube, a means for detecting a star scan frequency and a raster size indicated by #, a means for storing the raster scan frequency and the raster size together with correction data, and the raster scan frequency or When the raster size changes, the method further comprises means for predictively calculating corrected data after the change based on the previous color shift correction data, the raster scan frequency, and the raster size, and updates the corrected data in the memory. A digital dynamic convergence device. 2. The digital dynamic convergence device as set forth in claim 1, wherein the prediction of the correction data utilizes the property that color shift corresponds to the physical position of a cathode ray tube display surface and does not change.