JPS58154989A - Digital convergence device - Google Patents

Abstract

PURPOSE:To attain the adjustment of an inside adjusting point once, by writing the same correcting amount the same as a convergence correcting amount at the inside also to the outermost circumference adjusting point, in adjusting the adjusting point at the immediate inside of the outermost circumference adjusting point of a screen. CONSTITUTION:When the same correcting amount is written in the inside adjusting point (b) and the outermost circumference adjusting point (a), since the same correcting amount is written also in a virtual adjusting point, the correcting amount of the virtual adjusting point overflows and the required correcting amount of the inside adjusting point is written in a 1-frame memory 5 without inversion. In adjusting the adjusting points in the screen other than the outermost circumference and the inside adjusting points, since only the address represented with a cursor counter 10 is applied to the memory 5 via a multiplexer 22 and an address multiplexer 11, the correcting amount is written in the memory 5 by the same operation as conventional examples.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital convergence device.

Conventional convergence correction circuits use horizontal flyback pulses and vertical deflection waveforms! It was configured to obtain a convergence correction waveform in an analog manner using passive elements such as ll, inductance, capacitance, and resistance. However, such conventional convergence correction circuits have problems in terms of convergence correction accuracy. Therefore, in order to perform convergence correction with higher precision, methods that perform convergence correction digitally have been proposed in recent years.

This digital convergence correction device produces dot patterns or crossbars on the screen of a television receiver.
A convergence correction pattern such as a hatch pattern is projected, and the data of the convergence correction amount for each dot point or each cross-hatch point is recorded, that is, 1 m row n I.
Each convergence correction of J (m, n are integers) convergence adjustment points is digitally written into one frame memory, this information is read out in synchronization with the scanning of television reception, and IJ/A conversion is performed. This is to perform convergence correction. This will be explained in detail below using the drawings.

In FIG. 1, when a synchronization signal is applied from the synchronization signal input terminal 19, the control circuit 9 controls the correction pattern generation circuit 16 to display a horizontal line indicating adjustment points as shown in FIG. A dot pattern of 13 points in the direction and 9 points in the vertical direction is projected.

When all the kidney adjustment points to be corrected are selected using the cursor keys on the control panel 1, the addresses of these adjustment points are stored in the force 1 - torque counter 1o. This cursor counter 10
The addresses stored in the start address counter 13, which sequentially outputs the address of each adjustment point of the dot pattern, are detected in the match detection step @12, and the contents of the start address counter 13 and the cursor counter 1 are stored.
When the contents of o match, the cursor generation circuit 14 generates a cursor signal corresponding to the memory address of the cursor counter 1o, which is added to the dot pattern signal of the correction pattern generation circuit 15 by the addition circuit 16. Move the cursor to the selected adjustment point on the John screen and display it.

After selecting the adjustment point in this way, set the desired correction weight on the reversible counter 4 while looking at the image [I] with the color you want to correct, for example, the red writing key provided on the control panel 1. The contents of the reverse counter 4 are written to the address designated by the cursor counter 10 of the one frame memory 6 via the multiplexer 17 during the horizontal or vertical retrace period.

In this case, the town counter 4 has a cursor counter 10
The contents of the one-frame memory 6 at the address specified by are read out, and if you want to further increase the convergence correction chamber, increase the contents of the reversible counter 4, and vice versa. Write correction is performed by reducing the content Kl and writing desired data into one frame memory 5. In order to improve the accuracy of convergence correction at the periphery of the screen, virtual adjustment points are set up in one row each on the top, bottom, left and right on the outer axis, in addition to one point on the outermost periphery of the television screen, and the convergence of these virtual adjustment points is The amount of correction is obtained by the extrapolation value calculation circuit 18, and the multiplexer 1
7 and stores it in one frame memory 5.

In other words, if the correction amount data of the virtual adjustment point is calculated by @ line approximation, as shown in Fig. 3, each correction of the broken outer circumference adjustment point a is A1, and each correction of the adjustment point one position inside is B. , the correction amount C for the virtual adjustment point 0 is calculated by the C:2A-bf extrapolation value calculation circuit 18, and this value is stored in the 1-frame memory 6 via the multiplexer 17.

Next, reading out the convergence correction amount stored in the one-frame memory 6 will be explained. The convergence correction value of each adjustment point stored in the one-frame memory 6 is read out in synchronization with the second worst dot pattern by the address signal output from the read address counter 13. However, in 1-frame image processing 6, there is only corrected sound data for locations corresponding to adjustment points, including virtual adjustment points, so it is necessary to find corrected sound for each scanning line between adjustment points in the vertical direction. be. Therefore, interpolation circuit 6
The convergence correction amount at the first adjustment point and the convergence correction sound at the second adjustment point immediately below the first adjustment point are calculated for each scanning line included between the first and second adjustment points. A corrected sound is obtained by interpolation, and the output signal of this interpolation circuit 6 is converted into analog violet by a D/A converter 7. Since the output signal waveform of the D/A converter 7 has a staircase waveform, it is smoothed by a low-pass filter 8, and after amplification is supplied to a convergence yoke (not shown). Although the explanation has been given above using red as an example, the same applies to the correction of green and blue.

In such a digital convergence device, since convergence correction can be performed independently for each adjustment point, convergence correction can be performed with high accuracy.

However, when the oath was corrected, reversible counter 4 exceeded 7.
0-, resulting in an extremely large shift in convergence, resulting in the inconvenience that convergence adjustment is extremely difficult. 't, for example, if the number of multiplexed valley adjustment points is 8 bits, then 2 of 0 to 2 colors and 6
It can take 66 levels of value. The correction amount A at the outermost A adjustment point d shown in Figure 3 is 200, and the correction chamber B at the adjustment point b one position inside (referred to as the inner adjustment point) is B = 1.
60, the correction amount C of the virtual adjustment point C is given by the above formula C:
From 2A-kl, C=240. Moreover, in this state, it is assumed that convergence correction is completely performed or not.

So, if we change the correction friend of adjustment point a, then C
Until B = = 1ess of ≦255, no problem will occur.When tM is smaller than 165, c- = 256, overflow occurs and becomes C-0, and the convergence correction waveform becomes as if it was inverted. Teshibori.

In this way, when the correction amount at the virtual adjustment point becomes disastrously deviated from the essential correction amount, the torrent current that actually flows through the convergence coil (not shown) due to the responsiveness of the LPFs becomes 1
There is no one-to-one correspondence with the amount of correction stored in the frame memory 6, and convergence is achieved on the screen due to the amount of correction that is different from the cheapest amount of correction! cormorant. Next, adjust the outermost adjustment point a, and when the correction amount of the virtual adjustment point becomes within 266, the inversion state is resolved, the influence of LPF8 is reduced, the convergence of the inner adjustment point is shifted, and the inner adjustment point is adjusted again. This caused the inconvenience of having to repair it.

Therefore, the present invention aims to provide a convergence device that does not cause such inconvenience.

An embodiment of the present invention will be described below based on the drawings. In FIG. 4, parts that perform the same operations as in FIG. 1 are designated by the same numbers, and their explanations will be omitted.

The present invention attempts to prevent a value that is extremely different from the necessary correction amount during convergence adjustment by setting the same value as the correction amount for the innermost portion of the screen as the correction amount for the outermost periphery of the screen. be.

The operation will be explained in detail below. When you select the adjustment point for convergence correction by operating control panel 1, the address of that adjustment point will be displayed.

It is set in the cursor counter 10. The contents of the cursor counter 10 are input manually to the adjustment point discrimination circuit 2o, and the selected adjustment point is the adjustment point one screen inside the outermost adjustment point (
(referred to as the inner adjustment point) and outputs a determination number. Based on this determination signal, the outermost circumference address generation circuit 21 generates an address for the outermost circumference adjustment point. That is, the second
In the figure, if the inner adjustment point A on the left side of the screen is selected by operating the control panel 1, the outermost circumference address generation circuit 21 generates the address of the outermost circumference adjustment point a.

The multiplexer 22 outputs the address of the inner adjustment point from the cursor counter 1o and the outermost cylinder address generation circuit 21.
The address of the outermost adjustment point a is supplied to the switching address multiplexer 11.

The reversible counter 4 is the cursor counter 10 as described above.
If the contents of the one-frame memory 5 at the address specified by are read out and you wish to further increase or decrease the convergence correction, operate the control panel 1 to increase or decrease the contents of the reversible counter 4. reduce Then, first, the address of the inner adjustment point set in the cursor counter 10 is transferred to the multiplexer 22. When the address multiplexer 11 is used to select the position corresponding to the inner adjustment point a of the one-frame memory 6, the contents of the reversible counter 4 are written to that position. Next, the address of the outermost circumference adjustment point generated by the outermost circumference address generation circuit 21 is obtained.

Multiplexer 22. It is added via the address multiplexer 11, and the contents of the reversible counter 4 are also stored in the position corresponding to the outermost adjustment point of the one frame memory 6. That is, the same correction amount value is written to the inner adjustment point and the outermost adjustment point a. When the same correction amount is written to the innermost adjustment point A and the outermost adjustment point a, as is clear from the above, the same correction amount is also written to the virtual adjustment point, so the correction amount of the virtual adjustment point will overflow. The 1-up 1 inversion state does not occur, and the necessary correction amount of the inner adjustment point is stored in the 1-frame memory 6.

When adjusting the adjustment points on the screen other than the outermost adjustment points or the inner 1II11 adjustment points, only the address indicated by the cursor counter 107 is added to the one frame memory 6 by activating the multiplexer 22 and the address multiplexer 11. Performing the same operation as described in the example, the correction amount is 1
1 is written to the frame memory 6.

As is clear from the above description, according to the present invention,
When adjusting the convergence of the inner g411 adjustment point, which is one position inside the outermost circumference adjustment point, the reversible counter will overflow and the convergence correction waveform will not be reversed, so the adjustment of the inner adjustment point can be done at once. , the inconvenience of adjusting and writing the outermost circumferential adjustment points and adjusting the inner 1jllll adjustment points does not occur.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional digital convergence device, Fig. 2 is a projected image of a dot pattern, Fig. 3 is a diagram for explaining virtual adjustment points, and Fig. 4 is an example of a "misfire". 1 is a block diagram of a digital convergence device in FIG. 1-... Control panel, 4... Reversible counter, 6? ...1 frame memory, 6...
...Interpolation calculation circuit%7...IJ/A converter,
8...LPF, 9...Control circuit% 1
0... Cursor counter, 11... Address multiplexer, 12... Coincidence detection circuit, 13... Read address counter, 14...
... Cursor generation circuit, 15 ... Correction pattern generation circuit, 16 ... Addition circuit, 17.
...Multiplexer, 18 ... Extrapolation value calculation circuit, 20 ... Adjustment point discrimination circuit, 21 ...
...Outermost address generation circuit, 22...Multiplexer.

Claims (1)

[Claims] It has a one-frame memory that digitally stores the convergence correction amount for each adjustment point in m rows and n columns (m and n are integers), and the contents of this one-frame memory are synchronized with the scanning of the television reception frame. It is configured to read and perform convergence correction, and includes an adjustment point determination circuit that determines whether the adjustment point is one adjustment point inside the adjustment point on the outermost periphery of the image area, and a determination signal from this adjustment point determination circuit to determine the adjustment point on the outermost periphery. an outermost address generation circuit for generating an address, and means for switching between an address of an adjustment point one position inside the outermost adjustment point of the picture aperture, and an address from the outermost address generation circuit; When adjusting the adjustment point one position inside the outermost adjustment point of the screen,
This is a patented digital convergence device that is flexible and applies the same amount of correction to the outermost adjustment point as the one inner convergence correction point.