JPS6260391A - Digital convergence device - Google Patents

Abstract

PURPOSE:To simplify a rough convergence adjustment and to shorten the time adjusting convergence by providing a function transferring convergence correction data on adjusting points in any row or column to other lines or columns. CONSTITUTION:The convergence adjustment in the line at the center of a screen is made in the same manner as a conventional convergence device and then a data transfer key 17 is operated in a longitudinal direction. Then a CPU 2 transfers the correction data in the line to all the other lines. With respect to columns, the convergence adjustment at the center of the screen is made in a similar manner. Then a data transfer key 16 is operated to transfer the correction data to all the other columns. In such a way, the convergence rough adjustment of the entire screen is terminated. Next, writing and reading of the correcting amount at each adjusting point are executed in the action the same as the conventional convergence device. Thus the rough adjustment of convergence can be made, thereby shortening the convergence adjusting time.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a digital convergence device that can quickly and accurately adjust color television reception aLD convergence correction.

BACKGROUND OF THE INVENTION As is well known, a shadow mask type color cathode ray tube (hereinafter abbreviated as CRT) used in general color television receivers has three electron guns, one for red, one for green, and one for blue. However, since it is structurally impossible to arrange all of these electron guns on the central axis of the CRT, they are mounted slightly away from 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,
At the same time, red, green, and blue fluorescent dots are emitted through the same hole, creating 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, CR
At locations other than the central axis of T, the three electron beams converge in front of the shadow mask. Therefore, the three electron beams cannot pass through the same hole at the same time, and the color shift, or convergence shift, of the reproduced image increases as it moves away from the center of the screen. In order to prevent such inconveniences, it is necessary to perform convergence correction so that the three electron beams spread over the entire screen and converge at the shadow mass.

In addition, in a projection type color receiver that uses three CRTs that emit three primary colors to enlarge and project images onto a screen,
Since the angle of incidence of tT on the screen differs for each CRT, color shift occurs on the screen.

The superposition of these three primary colors, so-called convergence, is generally achieved by using a horizontal flyback pulse, vertical deflection waveform, and passive elements such as L, C, and R to obtain a convergence correction waveform in an analog manner. Although it has been adopted, there is a problem with convergence accuracy. In contrast, a method of digitally performing convergence correction has been proposed as a method of performing convergence with high accuracy.

The concept is to project a convergence correction pattern such as black dots or dots on the screen, digitally write the convergence correction amount data for each point in one frame memory, and use this information for horizontal and vertical scanning. The signals are synchronously read out, D/A converted and amplified, and convergence correction is performed. The explanation will be given below based on FIGS. 3 and 4.

First, as shown in Figure 4, on the screen, for example, 9 columns horizontally,
The hatch generator 9 displays black notches indicating adjustment points in seven lines in the vertical direction. The intersection of this chromeno-chi is the key i
It becomes a point.

square, cursor key 1Q on control panel 14,
For example, when an adjustment point is selected, the CPU 15 obtains the cursor address of the adjustment point and sets the cursor 16 in the register for displaying. At this time, the address of the 1 frame memory 3 is also obtained. Next, using the data write key 11 of the color to be corrected, for example red, the desired data is written into the designated address of the one frame memory 3 while looking at the screen. ,
The same procedure is repeated for all adjustment points on the screen.

Next, reading out the convergence correction amount written in the one-frame memory 3 will be explained.

Since the one-frame memory 3 only has correction data for positions corresponding to adjustment points, it is necessary to perform interpolation for each scanning line between adjustment points in the vertical direction. Therefore, for example, using the correction data of the first and second rows read from the one-frame memory 3, the amount of correction in the scanning line included between the adjustment points of the first and second rows is calculated. The interpolation calculation circuit 4 calculates the result.

Next, the output signal of the interpolation calculation circuit 4 is converted into an analog quantity by a D/A converter 6, smoothed by a low pass filter (LPF) 6, amplified by an amplifier 7, and then supplied to a convergence yoke.

In the digital convergence device described above, the adjustment points can be arbitrarily corrected independently, so that convergence correction can be performed with high accuracy.

Problems to be Solved by the Invention However, in the above configuration, convergence correction data is written from the beginning for each adjustment point for 63 (7 rows x 9 columns) adjustment points, which requires a lot of adjustment time. There was a problem.

In view of the above problems, the present invention provides a digital convergence device that can shorten the convergence adjustment time.

Means for Solving the Problems In order to solve the above problems, the digital convergence device of the present invention has a function of transferring convergence correction data of a horizontal adjustment point in any one row to another row, and It has a function to transfer the convergence correction data of the vertical adjustment point of a column to other columns.

Effect of the Invention With the above-described configuration, the present invention can transmit convergence correction data to all adjustment points on the screen by simply performing convergence correction on the horizontal adjustment point at the center of the screen and the vertical adjustment point at the center of the screen, so that coarse convergence adjustment is possible. It has the advantage of being easy to implement.

Embodiment A digital convergence device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a digital convergence device in one embodiment of the present invention. In the figure, 1 is a control panel, 2 is a CPU, 16 is a horizontal data transfer key provided on the control panel 1, and 1 is a horizontal data transfer key provided on the control panel 1.
7 is a vertical data transfer key provided on the control panel 1 as well.

The other parts are the same as those in FIG. 3, and their explanation will be omitted.

The operation of the digital convergence device configured as described above will be explained below with reference to FIGS. 1 and 2.

First, the convergence adjustment in the fourth line at the center of the screen shown in FIG. 4 is performed in the same manner as the conventional convergence device.

Figure 2 shows the convergence correction waveform at this time. Thereafter, when the vertical data transfer key 1a is operated, the CPU 2 transfers the correction data of the fourth line to all other lines. The state of the convergence correction waveform at this time is shown in the second
Shown in Figure B.

Similarly to the above, convergence adjustment is performed at the center of the screen in the column direction, and then the data transfer key 16 is operated to transfer the correction data to all other columns. The above operations complete the rough convergence adjustment for the entire screen. Next, the correction amount is written and the correction amount is read out for each adjustment point in the same operation as the conventional convergence device.

As described above, according to this implementation column, the convergence correction data of the horizontal adjustment point in one row is transferred to another row, and
By providing a function to transfer the convergence correction data of the vertical direction adjustment point of a column to another column, coarse convergence adjustment can be easily performed, thereby shortening the convergence adjustment time.

Effects of the Invention As described above, the present invention provides a function to transfer the convergence correction data of the adjustment point in any one row and column to each other row and column, thereby making coarse convergence adjustment easy. This allows the convergence adjustment time to be shortened.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a digital convergence device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing how correction data is transferred, FIG. ...Control panel, 2...CPU. 16.17...Data transfer key. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure □ 7th line Figure 4 Figure 9 da I

Claims (1)

[Claims] The screen of the color television receiver has a plurality of convergence adjustment points in the horizontal and vertical directions, and has means for inputting position information of the convergence adjustment points and means for correcting convergence deviation of the adjustment points. In a digital convergence device, means for transferring convergence correction data of a horizontal direction adjustment point in any one row to another row, and means for transferring convergence correction data of a vertical direction adjustment point in any one column to another column. A digital convergence device characterized by being provided with.