JPH0468389A - Digital convergence circuit - Google Patents

Abstract

PURPOSE:To display adjustment data at an adjustment point on a screen at the time of convergence adjustment by providing a character generator which generates a character signal for displaying the adjustment data on the screen according to address data and correction data which are outputted from a processor. CONSTITUTION:The processor 2 judges a position on the screen of a display device corresponding to the convergence adjustment point which is currently adjusted, outputs the address data on the position, and outputs the correction data for the convergence adjustment point which is currently adjusted. The character generator 15 generates the character signal for displaying the adjustment data on the screen according to the address data and correction data. This signal is added to generate a video signal, which is amplified by an output circuit 67 and sent to a CRT, so that the data is displayed on the screen. Consequently, the adjustment data at the adjustment point can be displayed on the screen during the convergence adjustment.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to convergence (
The invention relates to a digital convergence circuit that adjusts color shift correction.

[Conventional technology]

Conventionally, in order to correct convergence in a display device, it is necessary to apply a magnetic field that changes in a parabolic manner to a convergence yoke in synchronization with a horizontal synchronization signal and a vertical synchronization signal. Conventionally, a digital convergence circuit has been used as a means for generating a magnetic field with high correction accuracy.

FIG. 3 is a block diagram showing the configuration of a conventional digital convergence circuit. In FIG. 3, 1 is a control panel, 2 is a microprocessor that processes data,
3 is a read address generation circuit that generates a read address; 4 is a field memory that stores correction and correction data;
5 is a backup memory for hacking up data in the field memory 4; 6 is a crosshatch generation circuit that generates a crosshatch signal; 7 is an output circuit that outputs a video signal to the CRT; 8 is a cross cursor generation circuit that generates a cross cursor signal; 9 is a vertical interpolation circuit that calculates a vertical correction value; 10 is a conversion circuit that converts a serial signal into a parallel signal;
11 is a D/A converter circuit that converts a digital signal into an analog signal; 12 is a robust filter (LPF); and 13 is an output circuit that outputs a correction current to the correction coil 14 of the convergence yoke.

Next, the operation will be explained.

This digital convergence is adjusted by a microprocessor that operates according to the flowchart shown in FIG. 4 to measure misconvergence at adjustment points equally divided into one horizontal synchronization period. First, make each adjustment using the keyboard on the control panel 1 shown in Fig. 3, record the correction data in the field memory 4, read out the correction data from the field memory 4 in accordance with horizontal scanning, and read out the correction data for areas other than the adjustment points. In the vertical direction (vertical direction), the vertical interpolation circuit 9 calculates and interpolates a correction value for each scanning line from adjacent vertical correction data, and in the horizontal direction (horizontal direction), the D/A conversion circuit After converting to analog signal in step 11, LP
Correction was performed by interpolating with F12 and causing a correction current to flow through the correction coil 14 using the output circuit 13. However, this professional diagram shows only one digital convergence circuit. Actually, four digital convergence circuits are used for horizontal red and blue and vertical red and blue.

[Problem to be Solved by the Invention] As explained above, when conventional digital convergence is used in a display device and convergence is adjusted, it is difficult to determine the upper and lower limits of the adjustment data before digital/analog conversion. Because it is unknown, we do not know how far the adjustment point will move, and depending on the characteristics of the low-pass filter, there is a large error between the data when the data is measured by eye and the actual data, so we used this low-pass filter to linearly interpolate between the pigs. At the same time, the deviation in convergence between data becomes large, and the changes in the adjustment data at each adjustment point generally take a step-like pattern, but there are problems such as it is difficult to check the change state of the adjustment data. was developed in order to solve the above-mentioned problems, and its purpose is to obtain a digital convergence circuit that can display adjustment data of adjustment points on the screen during convergence adjustment.

[Means to solve the problem]

The digital convergence circuit according to this invention currently has three
a processor 2 that determines the position on the screen of the display device that corresponds to the convergence adjustment point that is being adjusted, and outputs address data indicating the position, and also outputs correction data for the convergence adjustment point that is being adjusted; and the address data. and a character generator 15 that generates a character signal for displaying adjustment data on the screen based on the correction data.

[Effect]

The processor 2 determines the position on the screen of the display device corresponding to the convergence adjustment point currently being adjusted, outputs address data indicating the position, and outputs correction data for the convergence adjustment point currently being adjusted. The character generator 15 generates a character signal for displaying adjustment data on the screen based on the address data and the correction data.

〔Example〕

FIG. 1 is a block diagram showing the main structure of a digital convergence circuit according to an embodiment of the present invention. In FIG. 1, components corresponding to those shown in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted. In Figure 1,
2 is a microprocessor that determines the position on the screen of the display device corresponding to the convergence adjustment point currently being adjusted, outputs address data indicating the position, and outputs correction data for the convergence adjustment point currently being adjusted;
15 is a character generator that generates a character signal for displaying adjustment data on the screen based on the address data and correction data; 16 is a crosshatch signal from the crosshatch generating circuit 6 and a cross cursor signal from the cross cursor generating circuit 8; This is an addition circuit that adds the character signal from the character generator 15 and the character signal from the character generator 15. Second
The figure shows the screen display state during adjustment.
7 is a screen of a display device.

Next, the operation of this embodiment will be explained. In Figure 1, control panel 1 shows the conharsis adjustment point (second
In the figure, where the vertical direction ■~@ and the horizontal direction ■~@ cross, in this case, there are 7 adjustment points in the vertical direction and 12 points in the horizontal direction, a total of 7 x 12 = 84 adjustment points)
The microprocessor 2 receives the change in the adjustment data at the adjustment point and writes the data into the field memory 4 and the hackup memory 5. The microprocessor 2 also determines whether the conharse adjustment point currently being adjusted is at the top or bottom of the screen (for example, in Figure 2, ■ to ■ are at the top of the screen,
～■ is at the bottom of the screen), and the judgment result is displayed on screen 17.
It is converted into address data indicating to which position on the top the adjustment button is to be output (for example, displayed at the lower right of the screen when adjusting the upper part of the screen, displayed at the upper right of the screen when adjusted at the lower part, etc.) and inputted to the character generator 15.

At the same time, the microprocessor 2 converts the correction data of the adjustment point currently being adjusted into character data of the character generator 15 and inputs the data to the character generator 15. Addition circuit 1 adds character signals (correction data for screen display) from character generator 15 created from these data.
Enter 6. The adder circuit 16 also receives a crosshatch signal which is necessary for convergence (color shift correction) adjustment and is output from the losshatch generation circuit 6 (as shown in FIG. A cross cursor signal outputted from the cross cursor generating circuit 8 to indicate which adjustment point is currently being adjusted (in the vertical direction in Fig. 2, The horizontal direction is a thick line represented by ■, which means that the adjustment points of ■-■ are currently being adjusted.Also, on the screen 17, since the cross hatch signal and cross cursor signal are added, only that cursor's brightness is adjusted. ) is also entered,
These three signals are added to form a video signal and input to the output circuit 7. Then, the output circuit 7 amplifies the video signal as much as necessary and sends it to the CRT, so that an image as shown in FIG. 2 is displayed on the screen 17.

Furthermore, if a character created by the character generator 15 overlaps a crosshatch or crosshair cursor on the screen 17, the character becomes difficult to see, so the character generator 15 sends a blanking signal to erase the crosshatch signal or crosshair cursor signal in the character display area. is also output, and before the character signal is input to the adder circuit 16, blanking is applied to the cross hatch signal and the cross cursor signal, and the character signal is added.

Through the above processing, when the current adjustment point is at the top of the screen as shown in FIG. 2, adjustment data such as "80" is displayed at the bottom of the screen.

According to the above embodiment, the digital convergence D/A
By projecting the adjustment data before conversion on the screen, you can see at a glance the movement range of the adjustment points, and since the data is displayed, you can see whether the data at each adjustment point is adjusted on a staircase, so you can make adjustments by visual measurement. There are fewer errors. Furthermore, since data for the next adjustment point can be predicted, adjustment time can be shortened.

〔Effect of the invention〕

As described above, according to the present invention, a character generator is provided that generates a character signal for displaying adjustment data on the screen based on the address data and correction data output from the processor. The adjustment data for each adjustment point can be displayed on the screen, allowing you to see at a glance the movement range of the adjustment point, as well as whether the adjustment data for each adjustment point has been adjusted correctly.
Therefore, the error is smaller than when adjusting by visual measurement, the next adjustment point can be predicted, and the adjustment time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main part configuration of a digital convergence circuit according to an embodiment of the present invention, FIG. 2 is a diagram showing the screen display state during adjustment in this embodiment, and FIG. 3 is a diagram showing a conventional digital convergence circuit. FIG. 4 is a block diagram showing the configuration of the \-zens circuit, and is a flowchart for explaining the general processing of the microprocessor of this conventional circuit. 2...Microprocessor, 15...Character generator, 17...Screen. Agent Patent Attorney Jun Miyazono - Fig. 2 Fig. 1 Hun Y Roll Halonel (1) Fig. 4 Heisei Sho (spontaneous) λ year/) L month/ρ mouth 5 Detailed explanation of the invention in the specification subject to amendment Column. G. Contents of the amendment (1) In the 5th line of page 2 of the specification, the phrase "addition of versens yoke number" is amended to "generate from versens yoke". Above 3. Representative of the person making the amendment

Claims (1)

[Claims] In a digital convergence circuit that adjusts convergence in a display device, it determines the position on the screen of the display device that corresponds to the convergence adjustment point that is currently being adjusted, outputs address data indicating that position, and also outputs address data that indicates the position. A digital convergence circuit comprising: a processor that outputs correction data; and a character generator that generates a character signal for displaying adjustment data on a screen based on the address data and the correction data.