JPH0448316B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention can be used in color television receivers to quickly and easily
The present invention also relates to a digital convergence device that can be adjusted with high precision.

BACKGROUND ART In a shadow mask type color picture tube used in general color television receivers, 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, resulting in color shift. In addition, in projection-type color receivers that use three picture tubes that emit three primary colors to project enlarged images onto a screen, the angle of incidence of the picture tubes on the screen differs for each picture tube, so the colors appear on the screen. Misalignment occurs. The superposition of these three primary colors, so-called convergence, is performed by creating a correction waveform synchronized with the horizontal and vertical scanning cycles and adjusting this waveform. This method tends to have large convergence defects around the screen,
Adjustment required skill. For this reason, a method of digitally creating a convergence correction waveform has been proposed as a method of performing more accurate convergence over the entire screen.

This digital convergence method projects a convergence correction pattern such as a dot signal on the screen, digitally writes the convergence correction amount data for each point in one frame memory, and then scans this data horizontally and vertically. It is read out in synchronization with the signal and performs D/A conversion to create a convergence correction waveform.

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

3 and 4 are block diagrams of digital convergence and correction pattern diagrams.

First, in Fig. 3, when a synchronization signal is applied to the input terminal 1, a correction pattern (cross hatch, etc.) is projected on the screen by the control circuit 2 and the correction pattern generation circuit 3 as shown in Fig. 4. Each intersection of the grid of this correction pattern is set as an adjustment point.

Next, select an adjustment point using the cursor keys on the control panel 6, store the address in the cursor counter 7, and match the address of the 1-frame memory control counter 9, which sequentially outputs the address of each adjustment point. When this happens, the coincidence detection circuit 8 outputs a coincidence signal, which is added to the cursor generation circuit 5 to generate a cursor signal corresponding to the memory address of the cursor counter 7, and the addition circuit 4 outputs a coincidence signal from the correction pattern generation circuit 3. The correction pattern and the cursor indicating the selected adjustment point are superimposed and displayed on the screen.

Next, select the color you want to correct in the control panel 6.
The desired correction amount is input to the reversible counter 11 by looking at the cursor on the screen indicating the selected adjustment point, and the output data is sent to the selected frame memory 13 via the data multiplexer 12. Multiplexer 10 for addresses indicating adjustment points
is written to the output address of

Furthermore, since the 1-frame memory 13 only has correction amount data for each adjustment point, the interpolation calculation circuit 14 calculates the correction amount for each scanning line between adjustment points in the vertical direction, and the output signal is D/A converted. The circuit 15 converts it into an analog signal and passes it through a low-pass filter (hereinafter referred to as LPF).
) 16, and after amplification is supplied to a convergence coil.

Red as above. green. Correct each blue signal.

Such a digital convergence device has good accuracy because convergence correction can be performed independently for each adjustment point.

As mentioned above, the digital convergence device configured as described above superimposes a cursor indicating the selected adjustment point on the correction pattern (cross hatch), displays it on the screen, and displays the selected adjustment point. The amount of correction was increased or decreased by key input to suit the correction of each color.

Problems to be Solved by the Invention However, in the above configuration, the cursor representing the selected adjustment point is superimposed on the correction pattern (cross hatch) and displayed on the screen.
Since the correction pattern at the adjustment point is difficult to see and the lattice spacing of the correction pattern is wide, the degree of adjustment can only be determined from the adjustment point and the vertical and horizontal lines orthogonal to the adjustment point. For these reasons, there have been problems in that it is difficult to adjust the convergence and the accuracy tends to be poor.

Means for Solving the Problems In view of the above problems, the present invention is designed to facilitate convergence adjustment and improve accuracy.

In order to solve the above-mentioned problems, the digital convergence device of the present invention, in convergence adjustment, uses a cross-hatch of a correction pattern and a cross-hatch (correction auxiliary This system has a configuration in which images (patterns) are superimposed and projected.

Effects With the above-described configuration, the present invention does not perform convergence adjustment only by the cross hatch between the selected adjustment point (cursor) and the correction pattern.
Adjustment accuracy can be improved because cross hatches (auxiliary adjustment patterns) with narrow grid spacing are superimposed only around the adjustment points, and since the center of the auxiliary adjustment patterns is the selected adjustment point, the cursor can be adjusted. There is no need to overlap the points, making convergence adjustment easier.

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 block diagram of a digital convergence device according to an embodiment of the present invention, in which a correction pattern and an auxiliary adjustment pattern are superimposed and displayed on a screen, and FIG. show. In each figure, the same parts as in FIGS. 3 and 4 are given the same numbers.

In FIG. 1, the correction pattern generation circuit 3 is the conventional pattern generation circuit 3 shown in FIG. 3, and the adjustment auxiliary pattern generation circuit 17 is a circuit that generates a pattern narrower than the grid spacing similar to the conventional cursor generation circuit. Then, these are added by the adding circuit 4 and displayed as shown in FIG. Here, 21 is a screen, 22 is a correction pattern, 23 is an auxiliary correction pattern, and 24
indicates the adjustment point. Here, the difference from the conventional example is that
The difference is that the cursor generation circuit 5 is replaced by a correction auxiliary pattern generation circuit 17.

In this way, convergence adjustment is not only performed by cross hatching between the selected adjustment point and the correction pattern, but also by superimposing cross hatches with narrow grid spacing around the adjustment point as in this example. In addition, since the center of the adjustment auxiliary pattern is the selected adjustment point, there is no need to superimpose the cursor on the adjustment point, and convergence adjustment can be easily performed.

Effects of the Invention As described above, according to the present invention, convergence adjustment can be easily performed and accuracy can be improved by superimposing a correction pattern and an auxiliary pattern with a narrow lattice interval around a selected adjustment point.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a digital convergence device according to an embodiment of the present invention, Fig. 2 is a pattern diagram of a pattern projected on a screen for convergence adjustment, and Fig. 3 is a block diagram of a conventional digital convergence device. , FIG. 4 is a pattern diagram showing the conventional correction pattern projected on the screen. 2... Control circuit, 3... Correction pattern generation circuit, 4... Addition circuit, 6... Control panel, 7... Cursor counter, 8... Coincidence detection circuit, 9... Frame memory control counter, 10...
...Address multiplexer, 11...Reversible counter, 12...Data multiplexer, 13...
...1 frame memory, 14...Interpolation calculation circuit, 1
5...D/A converter, 16...LPF, 17...
Auxiliary pattern generation circuit for adjustment.

Claims (1)

[Claims] 1. 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, means for inputting position information of the convergence adjustment point, and means for inputting position information of the adjustment point. A digital convergence system comprising a means for correcting convergence deviation, and which superimposes and projects a correction pattern and a correction auxiliary pattern with a narrow grid spacing around a selected adjustment point at the time of convergence adjustment. Device.