JPH0154918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital convergence device that digitally performs convergence correction of a color television receiver using a one-frame memory, and when an adjustment point outside the screen is selected, the selected adjustment point is The purpose of this invention is to obtain a digital convergence device that has the function of displaying on a screen.

Conventionally, as a convergence correction circuit, L, C,
An analog method is used to obtain a convergence correction waveform using passive elements such as R.
There is a problem with convergence correction accuracy. Furthermore, as a method of performing convergence correction with higher precision, a method of digitally performing convergence correction has been proposed in recent years.

This will now be explained based on FIGS. 1 and 2. The concept is to project a convergence correction pattern such as a dot pattern or a crosshatch pattern on the screen, and then digitally write data on the amount of convergence correction for each dot point or each intersection point of the crosshatch into one frame memory. , this information is read out, D/A converted, and convergence correction is performed. first,
For example, 13 lines horizontally on the screen as shown in Figure 2.
A crosshatch pattern generator 13 projects nine crosshatch patterns in the vertical direction. Note that the intersection of the crosshatches indicates the adjustment point. When an adjustment point to be corrected is selected using the cursor key 15 of the control panel 1, a cursor signal from the cursor generation circuit 12 is superimposed on the screen to indicate to the operator which adjustment point has been selected. The address of the adjustment point selected with the cursor key is stored in the cursor counter 8. Next, use the data write key 16 for the color you want to correct, for example, red, and write the desired data into the data reversible counter 2 while looking at the screen.
and writes the output of the data reversible counter 2 to the address specified by the cursor counter 8 of the one frame memory 3. Data reversible counter 2 contains 1 of the address specified by cursor counter 8.
When the contents of the frame memory 3 have been read out and you want to further increase the convergence correction amount, increase the contents of the data reversible counter 2, and conversely, when you want to decrease the convergence correction amount, decrease the contents of the data reversible counter 2. Write correction is performed by writing data of 1 frame into the memory 3. 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 amount data for locations corresponding to adjustment points, it is necessary to find the correction amount for each scanning line between adjustment points in the vertical direction. Therefore, the interpolation circuit 4 uses the correction amount of the first adjustment point and the correction amount of the second adjustment point immediately below the first adjustment point to correct each scanning line included between the first and second adjustment points. Find the quantity by interpolation. The output signal of the interpolation circuit 4 is converted into an analog quantity by a D/A converter 5. D/A
Since the output signal waveform of the converter 5 has a staircase waveform, it is smoothed by a low-pass filter (LPF) 6, and after amplification is supplied to the convergence yoke. The above explanation has been given using red as an example, but the same applies to the correction of green and blue.

With the method described above, since each adjustment point can be corrected independently, convergence correction can be performed with high accuracy, but convergence correction is not performed outside the outermost adjustment point, so it is said that convergence is not achieved only in this part. Defects arise. Therefore, in order to eliminate this drawback, the capacity of the 1-frame memory 3 includes one column outside the adjustment points on the screen, that is, the adjustment points on the screen are 13 horizontally x 13 vertically as shown in Figure 2. If it is 9, the capacity of one frame memory is (13+2)×(9+2) vertically, and there is an attempt to perform convergence correction even outside the screen to eliminate the above-mentioned drawback. However, the amount of correction outside the screen is 1
When writing to frame memory 3, the cursor indicating which point was selected was off the screen.
There was a drawback that it could not be displayed to the adjuster, making it difficult to tell which point was being adjusted.

The present invention aims to provide a convergence device that displays a cursor without such drawbacks.

An embodiment of the present invention will be described below based on the drawings. In FIG. 3, a cursor key group 15 provided on the control panel 1 is operated to select a desired adjustment point. As shown in Figure 2, the number of adjustment points is 13 horizontally x 9 vertically, and the addresses of each adjustment point are H ₁ , H ₂ ... H ₁₃ from the left in the horizontal direction, and the adjustment points outside the screen on the left are H ₀ , the off-screen adjustment point on the right is H ₁₄
shall be. Similarly, in the vertical direction, V ₁ , V ₂ , . . . V ₉ are taken from the top, and the adjustment point outside the screen at the top is V ₀ and the adjustment point at the bottom is V ₁₀ .

If an adjustment point within the screen is selected, i.e. H ₁ ~
H ₁₃ , V ₁ to V ₉ are selected, and now suppose that _the center of the screen in _{FIG .} V ₅ is memorized. The horizontal address counter 26 and the vertical address counter 21, which specify the address of one frame memory, read the contents of the one frame memory in synchronization with the deflection of the television receiver, so the horizontal address counter 26 specifies the address of _one frame memory. ~H ₁₄ , the vertical address counter 21 counts V ₀ ~V ₁₀ . The coincidence detection circuits 22 and 27 detect that the contents (H ₇ , V ₅ ) of the horizontal and vertical cursor counters 25 and 20 match the contents of the horizontal and vertical address counters 26 and 21, respectively, and determine the period of coincidence and the coincidence. Detection circuit 2
Coincidence signals are output from 2 and 27, respectively. The gate circuit 33 is controlled by each of the coincidence signals, and the cursor signal from the cursor generation circuit A31 is added to the crosshatch pattern signal from the crosshatch pattern generation circuit 13 in the coincidence signal output period adding circuit 35. The crosshatch pattern signal on which this cursor signal is superimposed is added to the video circuit of the television receiver and displayed on the television screen, thereby displaying the selected adjustment point to the convergence adjuster.

Next, the cursor display when an adjustment point outside the screen is selected will be explained. Assume now that an adjustment point (H ₇ , V ₀ ) outside the screen above the center of the screen is selected. At this time, the horizontal cursor counter 25
H ₇ is stored in the vertical cursor counter 20, and V ₀ is stored in the vertical cursor counter 20. The out-of-screen detection circuit 23 is a circuit that detects that the out-of-screen area in the vertical direction has been selected, and when the content of the vertical cursor counter 20 becomes V ₀ or V ₁₀ ,
Outputs vertical off-screen signal. The control circuit 24 is controlled by the vertical off-screen signal from the out-of-screen detection circuit 23, and when it detects the upper off-screen V ₀ , the contents of the vertical address counter 21 appear for a period of V ₁ , and the lower off-screen V ₁₀ is detected. When detected, the contents of the vertical address counter 21 appear for a period of _V9 . When the output signal of the control circuit 24 and the output signal of the matching circuit 27 are applied to the AND circuit 36, the above (H ₇ ,
When the adjustment point of V ₀ ) is selected, the contents of the vertical address counter 21 are output for a period of (H ₇ , V ₁ ),
The gate circuit 32 is controlled by this output signal,
The cursor signal from the cursor generation circuit B30 is sent out during the period (H ₇ , V ₁ ), added to the crosshatch pattern signal by the adder circuit 35, and displayed on the television screen. The cursor generation circuit B30 generates a cursor signal different from the cursor generation circuit A31, which generates a cursor signal displayed when an adjustment point on the screen is selected. For example, if the cursor signal of the cursor generation circuit A31 is such that the intersection point of the crosshatch of the selected adjustment point on the screen blinks N times per second, the cursor signal of the cursor generation circuit B30 is generated at the selected adjustment point outside the screen. When the intersection of the crosshatches immediately inside (H ₇ , V ₀ ) is selected, the intersection of the crosshatches (H ₇ , V ₁ ) blinks N' times (N'≠N) per second, and the area outside the screen is selected. It's starting to show what you've done.

Next, an adjustment point outside the screen in the horizontal direction is selected, for example, to the left of the center of the screen (H ₀ , V ₅ ).
At this time, H ₀ is stored in the horizontal cursor counter 25 and V ₅ is stored in the vertical cursor counter 20. The out-of-screen detection circuit 28 is a detection circuit that detects that the out-of-screen in the horizontal direction has been selected, and outputs a horizontal out-of-screen signal when the content of the horizontal cursor counter 25 reaches H ₀ or H ₁₄ . The control circuit 29 is controlled by the horizontal out-of-screen signal from the out-of-screen detection circuit 28, and when it detects H ₀ outside the screen on the left side, the content of the horizontal address counter 26 appears for a period of H ₁ , and when it detects outside the screen on the right side, the contents of the horizontal address counter 26 appear. , _H13 , the contents of the horizontal address counter 26 appear. When the output signal of the control circuit 29 and the output signal of the matching circuit 22 are applied to the AND circuit 37, the contents of the horizontal address counter 26 are output for a period of (H ₁ , V ₅ ). This output signal controls the gate circuit 32, and similarly to the above-mentioned vertical off-screen adjustment, the cursor signal from the cursor generation circuit B30, which has a different number of blinks from the cursor signal from the cursor generation circuit A31, is generated. Sending out the period of (H ₁ , V ₅ ), adding circuit 3
5, it is displayed on the television screen in addition to the crosshatch pattern signal.

The above description has been made by taking as an example the case where adjustment points outside the screen on the upper side and left side are selected, but it goes without saying that the same applies when adjusting points outside the screen on the lower side and right side of the screen are selected. Note that the crosshatch pattern generation circuit 13, horizontal address counter 26, vertical address counter 21, cursor generation circuit A31, and cursor generation circuit B30 must operate in synchronization with the scanning of the television receiver, so a synchronization signal is not supplied. It is controlled by a signal from a clock generation circuit 34.

As described above, according to the present invention, when an adjustment point on the screen is selected, the cursor is displayed at the selected location on the screen. A cursor appears at the adjustment point on the inner screen. In addition, since the cursor that is displayed when selecting inside the screen and the cursor that is displayed when selecting outside the screen are of different types, the adjuster can see at a glance which adjustment point has been selected, improving operability. greatly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional digital convergence device, FIG. 2 is a projection diagram of a crosshatch pattern, and FIG. 3 is a block diagram showing an embodiment of the present invention. 1...Control panel, 2...Data reversible counter, 3...1 frame memory, 15...Cursor key, 16...Write key, 20...Vertical cursor counter, 25...Horizontal cursor counter, 21...Vertical Address counter, 26...
Horizontal address counter, 22, 27... Match detection circuit, 23, 28... Out-of-screen detection circuit, 24, 2
9... Control circuit, 31, 30... Cursor generation circuit A/B, 32, 33... Gate circuit, 35...
addition circuit.

Claims (1)

[Claims] 1. In a digital convergence device that specifies a convergence adjustment point with the cursor keys, writes the convergence correction amount at this adjustment point to a 1-frame memory, and reads out the contents of the 1-frame memory to perform convergence correction, the convergence inside and outside the screen is a frame memory for storing correction amounts of adjustment points; a means for detecting selection of an adjustment point outside the screen; and a first cursor for generating a cursor signal displayed on the screen when an adjustment point on the screen is selected. a second cursor generating means that generates a cursor signal to be displayed on the screen when an adjustment point outside the screen is selected; and a detection signal from the means for detecting that the adjustment point outside the screen is selected. , a circuit for controlling the cursor signal from the second cursor generating means to be displayed at an adjustment point on the screen that is inside the selected adjustment point outside the screen. .