JPH03274890A - Digital convergence correcting device - Google Patents

Abstract

PURPOSE:To remarkably enhance the work efficiency of convergence adjustment by providing a jumping means for allowing a cursor to jump to plural points determined in advance and a means for allowing the cursor to skip by a prescribed value determined in advance. CONSTITUTION:Wherever a cursor is positioned, a cursor jump key 17 allows the cursor to jump to a position of an intersection of a cross pattern corresponding to depressed specific cursor jump keys 17-1, 17-2, 17-3, 17-4 and 17-5, when the specific cursor jump keys 17-1, 17-2, 17-3, 17-4 and 17-5 are depressed. A cursor skip key 20 is a key for allowing the cursor to skip by a prescribed quantity by combining it with a cursor key 16, and when the cursor key 16 is depressed, while depressing one of cursor skip keys 20-1, 20-2 and 20-3, the cursor can be allowed to skip by the skip quantity designated by the depressed skip key.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital convergence correction device for a color television receiver.

Junmaidan sandwiched wheat FIG. 6 is a block diagram of a conventional example.

In Fig. 6, 1 is a phase-locked loop (r
A horizontal blanking signal is input to the horizontal blanking input terminal 2 of the PLL circuit 1, a vertical blanking signal is input to the vertical blanking input terminal 3 of the PLL circuit 1, and the output of the PLL circuit 1 is Outputs the reference clock from the terminal. This reference clock is input to the next stage timing generation circuit 4, and the crosshatch generation circuit 5
It outputs an X row, y column signal (x, y are natural numbers) to the address generating circuit 7, and an address clock signal to the address generating circuit 7.

The crosshatch signal outputted from the crosshatch generation circuit 5 and the cursor signal outputted from the cursor generation circuit 8 are superimposed by the synthesis circuit 6 and displayed on the screen as a display signal. The composition circuit 6 has a crosshatch pattern W of 9 lines horizontally and 7 lines vertically within the screen as shown in FIG.
and cursor K (the cursor position shown in Figure 2 corresponds to the center of the screen) is displayed. In this case, the convergence adjustment points P are each intersection of the crosshatch pattern W, and the position where the cursor is located is the adjustment point to be corrected.

Address generation circuit 7 outputs a synchronous address to terminal a of address switching circuit 9.

The synchronous address is synchronized with horizontal and vertical blanking signals input to the PLL circuit 1.

The address switching circuit 9 includes terminals A and C in addition to terminal A. Switching between terminals a-b and terminal c-b is controlled by an address switching signal output from the control circuit 13. If terminals a and b are currently ON as shown in FIG.
guided by. As shown in FIG. 2, the digital correction data in the frame memory 10 each correspond to adjustment points that are intersections of loss hatch patterns, and are read out as digital correction data one after another in response to raster scanning. The read digital correction data is converted into an analog signal by a D/A conversion circuit 11, smoothed by a low-pass filter (hereinafter referred to as rLPF) 12, and thereafter amplified by a drive stage (not shown). Afterwards, it is supplied to the convergence yoke.

The control circuit 13 is a circuit using, for example, a microprocessor, and outputs a control address signal to the terminal C of the address switching circuit 9 and the nonvolatile memory 14. At the same time, it has a bidirectional data bus for frame memory 10 and nonvolatile memory 14. In other words, when terminal c-b of the address switching circuit 9 is turned ON by the address switching signal output from the control circuit 13 to the address switching circuit 9,
The frame memory 10 is now addressed by the control address signal and its contents can be changed through the data bus of the control circuit 13, allowing appropriate convergence correction digital data to be written.

Convergence adjustment is performed by controller 15. First, select the color to be adjusted using the color selection key 18. There are only two convergence adjustments: red on green and blue on green, so the color to choose is red or blue.

For example, if red adjustment is selected using the color switching button 18, a green and red crosshatch will be displayed on the screen. Next, the mode switching button 19 of the controller 15 is used to select either a cursor movement mode in which the cursor key 16 moves the cursor on the display or a convergence adjustment mode in which convergence is adjusted. Cursor movement mode is a mode in which the cursor moves vertically and horizontally on the display by operating the cursor keys 16, and convergence adjustment mode is a mode in which the cursor is moved vertically and horizontally on the display by operating the cursor keys 16 up, down, left and right at the location where the cursor is located, that is, at the adjustment point. This is a mode in which convergence correction is performed vertically and horizontally. That is, when the cursor movement mode is first selected with the mode switching button 19 and the cursor key 16 is operated, the cursor is moved to the point where correction is desired by the cursor signal derived from the cursor generation circuit 8. Next, after selecting the adjustment point as described above, select the convergence adjustment mode with the mode switch button 19, and correct the convergence at the location where the cursor is located in a crosshatch pattern by operating the cursor keys 16 up, down, left, and right. This is done by matching red to green.

Thereafter, in the same manner, convergence is corrected for all adjustment points on the screen that are the intersections of the crosshatch patterns, and the correction of green and red convergence is completed.

Next, select another color (blue in this case) using the color changeover button 18 and perform corrections on all adjustment points on the screen in the same way. When a series of convergence correction operations are completed, the control circuit 13 outputs an address switching signal to the address switching circuit 9 only during the vertical blanking period by turning on the controller 15 or a separately provided write switch (not shown). The writing is completed by outputting the terminal c-b so that it is turned on, and transferring and writing the contents of the frame memory 10 to the nonvolatile memory via the bidirectional data bus.

Note that the cursor center key 21 is a key that moves the cursor to the screen center position (the cursor position in FIG. 2) no matter where the cursor is located. In this case, the control circuit 13 receiving the cursor center signal outputs a cursor address signal of the convergence adjustment point to the cursor generation circuit 8 described above to display a cursor. This cursor center key 21 is used to return the cursor to the center in cases where the cursor is accidentally lost when making adjustments outside the screen.

When trying to correct convergence using the conventional device described above, the cursor can only be moved up, down, left or right to each intersection point of the crosshatch pattern one by one; There is a problem in that it takes time to move to the other corner or especially to move diagonally.

In order to solve the above-mentioned problems, the present invention aims to solve the above-mentioned problems by adding
A pattern generation circuit that generates a crosshatch pattern that divides the vertical direction into X equal parts, a frame memory that uses each intersection of the pattern as a digital convergence correction point and stores a digital correction amount corresponding to each correction point, and a cursor. means for selectively specifying the correction points by means of a plurality of predetermined points; The cursor is configured to include a jump means for causing the cursor to jump, and a skip means for causing the cursor to skip by a predetermined value.

Operation -■ When the jump means is operated, the cursor can be jumped to a predetermined position no matter where the cursor is located, and when the skip means is operated, the cursor can be jumped to a predetermined position. Since only a value can be skipped, the cursor can be quickly moved to any adjustment point in the crosshatch pattern, increasing the efficiency of convergence adjustment.

叉JLfi FIG. 1 is a block diagram of one embodiment of the present invention.

The parts corresponding to the conventional example shown in FIG. 6 are designated by the same reference numerals and the explanation thereof will be omitted.

In FIG. 1, reference numeral 25 denotes a controller that constitutes the main part of the present invention, and the controller 25 includes cursor keys 16. Color switching key 18 and mode switching key 19
In addition to this, there is also a cursor jump key 17.
and a cursor skip key 20. To move the cursor, as described above, select the cursor movement mode using the mode switching key 19 of the controller 25 and press the cursor key 16 in the desired direction. At this time, a signal corresponding to the cursor key 16 is input to the control circuit 13, and a cursor address signal corresponding to the cursor key 16 is output to the cursor generation circuit 8 from the current location of the cursor. For example, as shown in FIG. 3, the cursor address is the y-axis in the horizontal direction and the y-axis in the vertical direction, and if the lower left is (0, O), the center is (5, 4). Assuming that the cursor is now at the center, if you press cursor key 16-2 (move down one level) shown between here and there, a cursor address signal of (5, 3) will be output, and (
The cursor moves to address 5, 3). The cursor jump key 17 is a specific cursor jump key 17-1.17-2.17-3.17 no matter where the cursor is located.
-4. Specific cursor jump key pressed when pressing 17-5 17-1.17-2.17-3゜17-4
．． This key is used to jump the cursor to the intersection of the cross patterns corresponding to numbers 17-5. Cursor jump key 17-1.17-2.17-3.17-4.17-
As shown in Figure 4, move the cursor to the upper left (2, 6) and lower left of the cursor (2°2) to locate the intersection of the cross patterns corresponding to 5.
, upper right cursor (8,6), lower right cursor (8,2).

For example, if you press the cursor jump key 17-1 corresponding to the center of the cursor (5, 4), the cursor will jump to the address position (2, 6) of the cross pattern no matter where it is. Here, five cursors are shown together for ease of understanding, but in reality one of them is
Only one is displayed.

Next, the cursor skip key will be explained.

The cursor skip key 20 is a key for skipping the cursor by a predetermined amount in combination with the cursor key 16, and in the embodiment shown in FIG.
．． 20-3 is provided, and the skip amount of each skip key is set to 2, 3, and 4 scales. Using only the cursor keys 16, the cursor can only be moved up, down, left, and right by one division of the cross pattern from the current position. If you press the cursor, you can skip the amount specified by the skip key you pressed. For example, cursor skip key 2
If the cursor key 16-4 is pressed while pressing 0-2, the cursor will skip three scales to the right from the current position.

The above can be summarized as shown in FIG.

Here, in the address change, x and y each indicate the current address of the cursor, where X is an integer from 0 to 10 and y is an integer from 0 to 8. On the other hand, if the convergence shifts due to the influence of the earth's magnetic field when changing the installation location of a color television receiver, or if the convergence shift occurs due to temperature drift, first use static convergence to eliminate the convergence shift at the center. In order to readjust the image after the image has been adjusted, it is necessary to correct the convergence at the periphery of the screen. In such a case, if there is a cursor jump key 17, the cursor can be jumped to any of the four corners of the screen using the cursor jump key 17, and the cursor can be skipped by a predetermined amount using the cursor skip key 20. This makes it possible to increase the efficiency of adjustment. Also, the larger the screen size, the larger the amount of cursor movement, so use the cursor jump key 17 to jump the cursor to the four corners of the screen, and use the cursor skip key 20 to jump the cursor to the four corners of the screen.
Since the cursor can be skipped, adjustment efficiency can be significantly improved.

Since the present invention has the above-described configuration, the cursor can be jumped to a predetermined position on the screen during readjustment, and the cursor can be moved by a predetermined amount at a time. Since it can be skipped, the cursor can be quickly moved to the adjustment position, and the work efficiency of convergence adjustment can be significantly improved. This is also advantageous because the larger the screen size, the larger the amount of movement of the cursor.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the present invention, Figs. 2 to 5 are explanatory diagrams of the operation of the present invention, the second part is a diagram showing a crosshatch pattern, and Fig. 3 is a diagram showing a cursor address on a crosshatch pattern. FIG. 4 is a diagram showing the jump position of a cursor on a crosshatch pattern, FIG. 5 is a diagram for explaining key operations and cursor movement, and FIG. 6 is a block diagram of a conventional example. 5-Crosshatch generating circuit 10-Frame memory. 16, 16-1.16-2.16-3.16-4. ---
-Cursor keys 17, 17-1.17-2.17-3.
17-4.17-5...-Cursor jump key 20, 20-1.20-2.20-3-Cursor skip key 25-Controller.

Claims (1)

[Claims] (1) A pattern generation path that generates a crosshatch pattern that divides the screen of a raster scan type color display device into equal parts x in the horizontal direction and y in the vertical direction, and each intersection of the pattern is used as a digital convergence correction point. a frame memory for storing a digital correction amount corresponding to a correction point; a means for selectively specifying the correction point using a cursor; and a frame memory for reading out the digital correction amount in the frame memory in synchronization with the deflection timing of the color display device and performing convergence. A digital convergence correction device that performs correction, comprising a jumping means for jumping a cursor to a plurality of predetermined points, and a means for causing the cursor to skip by a predetermined value. Device.