JPH0244989A - Digital 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 the Invention The present invention relates to a digital convergence device that can quickly and accurately adjust convergence correction in a color television receiver.

2. Conventional technology As is well known, the shadow mask type color cathode ray tube (hereinafter abbreviated as CRT) used in general color television receivers has three electron guns: red, green, and blue. have. However, if all of these multiple electron guns are CR
Since it is structurally impossible to place it on the central axis of the T, it is installed slightly in front of the central axis and slightly tilted inward with respect to the central axis. Therefore, on the screen on this central axis, each electron beam converges at the shadow mask, and at the same time emit red, green, and blue fluorescent dots through the same hole, resulting in a convergence state. However, since the radius of curvature of the shadow mask is larger than the distance from the center of deflection to the center of the shadow mask, the three electron beams converge in front of the shadow mask at locations other than the central axis of the CRT. Therefore, three electron beams cannot pass through the same hole at the same time, and the reproduced image has color shift as it moves away from the center of the screen.
In other words, the convergence shift becomes thicker.

3-7 In order to prevent such inconveniences, it is necessary to perform convergence correction throughout the art dealer so that the three electron beams converge at the shadow mask.

In addition, in projection-type color television receivers that use three CRTs that emit three primary colors to project enlarged images onto a screen, the incident angle of the CRT to the screen differs for each CRT, resulting in color shift on the screen. arise. The superposition of these three primary colors, so-called convergence, is -
On the film surface, a method is adopted in which a convergence correction waveform is obtained in an analog manner using a coil and passive elements such as a capacitor C1 and a resistor R from a horizontal flyback pulse and a vertical deflection waveform, but there is a problem in terms of convergence accuracy. There is.

In contrast, a method of digitally performing convergence correction has been proposed as a method of performing convergence with higher precision. The concept is to project a cross-hatch convergence correction pattern on the screen, digitally write the convergence correction amount data for each intersection into one frame memory, and synchronize this information with horizontal and vertical scanning. The data is read out, D/A converted, amplified, and convergence correction is performed.

An example of the digital convergence correction described above will be described below with reference to the drawings.

Fig. 2 is a functional block diagram showing the generation operation of a conventional convergence adjustment signal, Fig. 3 is a block diagram of a digital convergence device, and Fig. 4 is a projection state of a cross hatch which is a convergence adjustment signal. FIG.

As shown in FIG. 4, a crosshatch 23 is displayed on the screen by the control unit 6, for example, in nine columns in the horizontal direction and seven rows in the vertical direction, without showing adjustment points. The intersection of these crosshatches 21 becomes the adjustment point. In addition to outputting a pattern signal for convergence correction, the control section 6 also outputs a control signal for controlling the digital convergence device, and also serves as an interface between the control panel 19 and the CPU 12.

First, when an adjustment point is selected using the cursor keys on the control I/roll panel 19 shown in FIG. memory 5. At this time, the addresses of the nonvolatile one-frame memory 13 and data buffer memory 7 are also obtained. In addition, in the data buffer memory 7, in addition to an area for storing digital convergence control data such as cursor position data and correction data for all crosshatch adjustment points, a stack area and a warging area used by the CPL 112 are allocated. It is being After the above operation, the control unit 6 reads the cursor address stored in the cursor position data memory 5, and displays the cursor at the corresponding adjustment point on the screen. Next, input the color you want to correct using one control panel, look at the cursor on the screen that indicates the selected adjustment point, and perform convergence adjustment using the adjustment keys on the control panel 19.
The desired data is written to the specified address of the data buffer memory 7. When a certain period of time has elapsed after the adjustment key operation is completed, the above correction data is written into the non-volatile one-frame memory 13. Then, the same process is performed for other colors in sequence. Hereinafter, the same procedure is performed for all adjustment points.

Next, reading out the convergence correction amount written in the data buffer memory 7 will be explained. Since the correction data written in the data buffer memory 7 is only for the positions corresponding to the adjustment points shown in FIG.
It is necessary to perform interpolation for each scan line between adjustment points in the vertical direction. Therefore, for example, by using the correction data of the first and second rows read from the data buffer memory 7, the correction data of the scanning line included between the adjustment points of the first and second rows "1" is calculated. Calculation of correction amount by interpolation calculation on CPU 12,
One frame is written to the random access memory 14. Thereafter, the data written in the one-frame random access memory 14 is read out, converted to an analog signal by a D/A converter 15, smoothed by a low-pass filter (LPF) 16, and amplified by an amplifier 17, and then converted to a convergence coil ( (not shown). Note that during the convergence adjustment operation 71.-/, the correction data for each adjustment point is written into the nonvolatile one-frame memory 13, but this is for backing up the correction data. When the power of the digital convergence device is turned off, the correction data written in the data buffer memory 7.1 frame random access memory 14 disappears. Therefore, when the power is turned on, by writing the correction data stored in the nonvolatile one-frame memory 13 into the data buffer memory 7, it is possible to eliminate the trouble of re-adjusting each time the power is turned on.

Next, generation of the convergence adjustment signal will be explained. In FIG. 2, a correction pattern generation circuit 1 outputs a correction pattern (such as a crosshatch) in synchronization with an input synchronization signal. The cursor generation circuit 2 generates a cursor signal corresponding to the cursor address stored in the cursor position data memory 5 in the data buffer memory 7 shown in FIG. The correction pattern and the cursor indicating the selected adjustment point are superimposed and displayed on the screen.

This digital convergence device displays a cursor so that the convergence adjuster can confirm which adjustment point has been selected, and has a function to make the cursor blink to make confirmation even easier. Therefore, next we will explain the function that makes the cursor blink. The cursor generating circuit 2 shown in FIG. 2 does not display a cursor when the cursor address is a certain value (cursor erase data). Therefore, the cursor can be erased by inputting cursor erase data into the cursor position data memory 5 by the CPU 12 shown in FIG.

Note that the cursor address stored in the cursor position data memory 5 is saved in the cursor data buffer 11. After a certain period of time has elapsed, when this cursor address is written into the cursor position data memory 5, a cursor is displayed at the selected adjustment point. Furthermore, after a certain period of time has elapsed, the cursor erase data is written into the cursor position data memory 5 again into the write section 9. ” By repeating step 1, you can make the cursor blink. Naori - The blinking time of the cursor is, for example, after 10 key scans, the cursor disappears,
After that, the cursor is displayed after 10 key scans, so the number of key scans is counted and the count is used to create the screen. Therefore, to change the blinking speed of the cursor, just change the above count number.

In the digital convergence device described above, the cursor indicating the selected adjustment point blinks, so that the selected adjustment point can be easily confirmed. In addition, since the adjustment points can be adjusted independently, the accuracy can be improved (convergence correction can be performed).

Problems to be Solved by the Invention However, in the configuration of the convergence adjustment signal generating section as described in 1, if the cursor blinking speed is increased, the time required for the cursor blinking process will increase in proportion to the CPU operating time. As a result, the response to key input on the control I/roll panel becomes worse. Therefore, the speed at which the convergence shift is adjusted is slow, and the time required for the adjustment is therefore long.

In view of the above-mentioned problems, the present invention moves the cursor blinking process, which was conventionally performed by the CPU, to the convergence adjustment signal generation unit, so that even if the cursor blinking speed is increased, the response time to key manual input is affected. This allows convergence adjustment to be made quickly without giving any

Means for Solving the Problems In order to solve the above problems, the digital convergence device of the present invention adds a cursor blinking processing section to the convergence adjustment signal generation circuit of the control section, and further includes a cursor blinking processing section in the data buffer memory. Memory for blinking time data is allocated.

According to the present invention, the cursor blinking processing section displays and erases the cursor signal output from the cursor generation circuit at the time intervals of 11 . . . - written in the cursor blinking time data memory. As a result, the cursor displayed on the screen blinks. And the CPU
The burden will be lighter.

Embodiment Hereinafter, a digital convergence device according to an embodiment of the present invention will be described with reference to the drawings.

First, an explanation of the operation of the digital convergence device in this embodiment will be omitted since it is the same as the conventional system shown in FIG. 3.

FIG. 1 is a functional block diagram showing the operation of generating a convergence adjustment signal in one embodiment of the present invention. Here, 3 is a cursor blinking processing unit provided in the control unit 6;
0 is a cursor blinking time data memory provided in the data buffer memory 7. The operation will be explained below.

In FIG. 1, a correction pattern generating circuit 1 outputs a correction pattern (cross hatch) in synchronization with an input synchronization signal. The cursor generation circuit 2 generates a cursor signal corresponding to the cursor address stored in the cursor position data memory 5 in the data memory 7 (data in FIG. 3). The cursor blinking processing section 3 writes the cursor signal output from the cursor generation circuit 2 into the cursor blinking time data memory 5 (located in the data buffer memory 7 in FIG. 3) by the CPU 12 in FIG. Display and erase by time interval.

The addition circuit 4 adds the signal output from the correction pattern generation circuit 1 and the flashing-processed cursor signal output from the cursor blinking processing section 3, and displays the correction pattern and a blinking cursor indicating the selected adjustment point on the screen. are superimposed and projected.

As shown in the figure below, this configuration includes the cursor blinking processing unit 3 in the convergence adjustment signal generation circuit and allocating the cursor blinking time data memory 5 in the data buffer memory 7 to perform the cursor blinking process. This is done in the convergence adjustment signal generation circuit, and the CPU 12
lightens the burden of As a result, even if the cursor blinking speed is changed by changing the time interval data in the cursor blinking time data memory 5, the response time to key human power is 13.
・Since \-7 is not affected, convergence adjustment can be done quickly.

Advantages of the Invention As described in Section 2, in the present invention, the load on the CPU can be reduced by performing the blinking process of the cursor in the convergence adjustment signal generation circuit, so that convergence adjustment can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the operation of generating a signal for comparability adjustment in a digital convergence device according to an embodiment of the present invention, and FIG. 2 is a functional block diagram showing the operation of generating a conventional convergence adjustment signal. FIG. 3 is a block diagram of the digital convergence device, and FIG. 4 is a front view showing a projected state of a cross hatch which is a convergence adjustment signal. 1... Correction pattern generation circuit, 2... Cursor generation circuit, 3... Cursor blinking processing section, 4
... Addition circuit, 5 ... Cursor position data memory, 6 ... Control section, 7 ... Data buffer memory, 814 \-7 ... Synchronization signal input J terminal , 9... Signal output terminal for convergence adjustment, 10... Cursor blinking time data memory.

Claims (1)

[Claims] A convergence adjustment signal comprising means for generating a correction pattern that enables convergence adjustment at multiple points in the horizontal and vertical directions on the screen of a color television receiver, and means for inputting position information of the convergence adjustment points. It is characterized by comprising a generating circuit and a means for correcting the convergence deviation of the adjustment point, and the convergence adjustment signal generating circuit performs a process of blinking a cursor indicating the adjustment point selected by the position information input means. digital convergence equipment.