JPH08223593A - Convergence automatic adjusting circuit - Google Patents

Abstract

PURPOSE: To reduce the number of times of convergence till convergence is matched on a screen and to shorten adjusting time by performing a convergence adjustment by the final value of the correction data in all the adjusting points. CONSTITUTION: The horizontal/vertical positional information by a television camera 1 is stored in an adjusting point memory 4. Next, the difference of the horizontal and vertical information is determined from the contents of the memory 4 and a reference point memory 3. Next, the horizontal and vertical correction data is stored in a memory 9. When the positional information on the adjusting point and the positional information on a reference point are matched, the contents of the memory 9 is written in a convergence adjusting memory 11 by a control circuit 7. When the correction data in all the adjusting points is written in the memory 11, the correction data is read, and the correction data for every scanning line is calculated 12 for the adjusting points in the vertical direction based on this correction data The interpolation signal of the output is converted into an analog signal, the signal is supplied to a convergence coil and a convergence adjustment is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence adjusting circuit for adjusting the convergence of a television receiver.

[0002]

2. Description of the Related Art In a projection type color television receiver for magnifying and projecting on a screen by using three picture tubes emitting three primary colors, the angle of incidence of the picture tube with respect to the screen is different for each picture tube. Color shift occurs on the top.

For the convergence adjustment in which the three primary colors are superposed with respect to the color shift, a method of obtaining a convergence correction waveform in an analog manner has been adopted. However, this method has a problem in terms of convergence accuracy, and as a method of adjusting the convergence with higher accuracy over the entire screen, a digital convergence adjustment method that digitally adjusts the convergence has been conventionally proposed.

Such a conventional digital convergence adjusting method will be described below with an example thereof. The concept of this digital convergence adjustment method will be described.

First, a convergence adjustment pattern such as a crosshatch is projected on the screen, and each intersection of the grids of this convergence adjustment pattern is used as an adjustment point. Data corresponding to the amount of convergence correction for each adjustment point is digitally written in a memory, this information is read and D / A converted to obtain a correction current, and the correction current thus obtained is converged. It is passed through a coil for convergence adjustment.

This digital convergence adjustment method will be described in detail with reference to the drawings. 2A is a convergence adjustment pattern, and FIG. 2B is the same as FIG.
It is an enlarged view of the adjustment point of (a). Further, FIG. 4 is a configuration diagram of a convergence adjustment circuit for realizing the conventional digital convergence adjustment method.

First, as shown in FIG. 2A, for example, a crosshatch is projected as a convergence adjustment pattern on the screen. Adjust the adjustment point of the place you want to adjust,
The selection is made with the cursor keys of the control panel 16 shown in FIG.

Next, if the color to be adjusted is red, for example, with the red data writing key,
Data is written into the convergence adjustment memory 18 through a data reversible counter 17 which is an up / down counter capable of increasing or decreasing data. Writing to and reading from the convergence adjustment memory 18
The signals of the write address counter 19 and the read address counter 20 are switched by the multiplexer 22. Here, the multiplexer 2
A description of the switching control method of No. 2 will be omitted.

In the convergence adjustment memory 18, the contents of the write address counter 19 and the read address counter 20 are compared by the comparator 21. As a result, when the contents match, a signal issued from the comparator 21 causes data reversibility. The contents of the counter 17 are set.

If it is desired to further increase the amount of convergence correction, the contents of the data reversible counter 17 are increased and the data is written into the convergence adjustment memory 18 for correction. In the opposite case, the data reversible counter 17
Is reduced and the data is written to the convergence adjustment memory 18.

Hereinafter, similarly, all adjustment points on the screen will be described. Since the reading from the convergence adjustment memory 18 is performed in synchronization with the deflection of the television receiver,
The read address counter 20 is synchronized with the deflection.

Next, regarding the reading of the correction amount of each adjustment point written in the convergence adjustment memory 18,
Since the convergence adjustment memory 18 has only the data of the locations corresponding to the adjustment points, the interpolation arithmetic circuit 23 obtains the correction amount for each scanning line between the adjustment points in the vertical direction.

An output signal of the interpolation calculation circuit 23 is converted into an analog signal by a D / A converter 24, and a low pass filter (L
It is smoothed by a PF) 25, amplified by an amplifier 26, and then supplied to a convergence coil.

Further, the green and blue convergence adjustments are performed in the same manner as the above-mentioned red convergence adjustment.

[0015]

However, in the conventional convergence adjustment circuit as described above, a correction current is passed through the convergence coil for horizontal adjustment and the convergence coil for vertical adjustment to make a horizontal adjustment and a vertical adjustment. Convergence is adjusted by generating a magnetic field and correcting the deflection position of the electron beam of the CRT by each of these magnetic fields.

However, due to the mutual interference of the magnetic fields generated by the convergence coils for horizontal adjustment and vertical adjustment, as shown in FIG. 3 (a), the vertical position may move simultaneously with the horizontal adjustment. In addition, the horizontal position also moves at the same time as the vertical adjustment is performed, and the convergence in the direction other than the intended direction shifts.Therefore, it is necessary to repeat the horizontal and vertical adjustments alternately, so the convergence adjustment converges. There is a problem that it takes a lot of time to perform.

According to the present invention, the above problems can be solved to automate the convergence adjustment, reduce the number of convergences until the convergence is matched on the screen, and shorten the time until the convergence adjustment is completed. It is an object of the present invention to provide a convergence automatic adjustment circuit that can perform such adjustment.

[0018]

In order to achieve the above object, the convergence automatic adjustment circuit according to claim 1 of the present invention is for convergence adjustment for displaying an image on a screen on which an image is displayed. A means for receiving the pattern through a television camera and storing horizontal position information in the horizontal direction and vertical position information in the vertical direction at the adjustment point to be the target of the convergence adjustment on the convergence adjustment pattern; Means for storing horizontal position information and vertical position information at a reference point that should be after completion, means for subtracting between the horizontal position information and the vertical position information at the stored adjustment points and reference points, and the subtraction Corresponds to the subtraction processing result when the processing result is in a range where it can be considered that the adjustment point and the reference point do not match. Means for multiplying the correction coefficient and the correction data for supplying the value of the correction current for the convergence adjustment supplied to the convergence coil, and means for updating the correction data with the result of the multiplication processing and storing it as new correction data. And a means for supplying the correction current obtained by analog-converting the new correction data to the convergence coil, and correcting the position of the adjustment point on the convergence adjustment pattern projected on the screen, A match determination unit that determines that the subtraction processing result is in a range where it can be considered that the adjustment point and the reference point match, and the determination regarding the adjustment point and the reference point of the match determination unit is detected. The correction data at that time is saved as the final value of the correction data at the adjustment point, and the auxiliary device saved by the control means is saved. Means for storing the final value of the data, and corrects the position on the screen for the adjustment point by the new correction data updated by the multiplication processing result corresponding to the subtraction processing result. The position correction processing is repeated until the coincidence determination means determines that the subtraction processing result is in a range where it can be considered that the adjustment point and the reference point are coincident with each other, and the position correction processing is performed on the screen. Is performed for all the adjustment points on the convergence adjustment pattern displayed on the display device, and the control means is configured to save the final value of the correction data at all the adjustment points. The convergence adjustment is performed according to the final value of.

[0019]

According to the structure of claim 1, the subtraction processing result in the position information between the adjustment point on the convergence adjustment pattern and its reference point is detected, and the correction obtained corresponding to the detected subtraction processing result is detected. The coefficient and the correction data that gives the correction current value for the convergence adjustment of the adjustment point are calculated, the correction data is updated by the calculation result, and the convergence adjustment is performed using this correction data.

This process is repeated until the result of the subtraction process falls within the range in which it can be considered that the adjustment point and its reference point match.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic convergence adjusting circuit according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the convergence automatic adjustment circuit of this embodiment. FIG. 2A is a convergence adjustment pattern, and FIG. 2B is an enlarged view of the adjustment points in FIG. 2A. Here, the raster adjustment of the amplitude and linearity of green is completed, and the reference point memory 3 of FIG. 1 stores the position information of the reference point with each intersection point of the grid of the single color of green as the reference point. I shall.

First, a convergence adjustment pattern (for example, a cross hatch) as shown in FIG. 2A is displayed on the screen, and each intersection of the grids is used as an adjustment point. Here, for example, in the case of performing the red convergence adjustment, a single-red convergence adjustment pattern is displayed.

With the television camera 1 shown in FIG. 1, any one of the convergence adjustment patterns displayed on the screen is displayed.
Position information of the adjustment points is received as R (red), G (green), B (blue) signals and synchronization signals, and these R, G, B are received.
The signal and the synchronizing signal are converted into horizontal position information in the horizontal direction and vertical position information in the vertical direction by the position information conversion circuit 2, and these information are stored in the adjustment point memory 4 by the control signal of the control circuit 7 as a control means. . Similarly, the position information at each adjustment point is received by the television camera 1, converted into horizontal position information and vertical position information by the position information conversion circuit 2, and this information is adjusted by the control signal of the control circuit 7. Stored in the memory 4.

The horizontal position information and vertical position information of the adjustment points stored in the adjustment point memory 4 and the horizontal position information and vertical position information of the reference points stored in the reference point memory 3 are respectively stored in the adjustment point memory. 4 and the reference point memory 3 are read by the control signal of the control circuit 7, and the adjustment point memory 4
The horizontal position information and vertical position information of the adjustment point read by the horizontal position information and the vertical position information of the reference point read from the reference point memory 3 Information is subtracted from each other to obtain a horizontal and vertical difference.

When the position information of the adjustment point and the position information of the reference point do not match (mismatch) or exceed the specified value (considered as mismatch), the difference between the horizontal position information in the horizontal adjustment is determined. The corresponding correction coefficient (the correction coefficient predicts and calculates the movement of the convergence) and the correction coefficient corresponding to the vertical difference are read from the coefficient ROM 8 and the multiplier 1
The multiplication process is performed with 0, and the multiplication process result and the horizontal correction data are further subjected to the multiplication process with the multiplier 10.

Further, the correction coefficient corresponding to the difference in horizontal position information in the vertical adjustment and the correction coefficient corresponding to the vertical difference are read from the coefficient ROM 8 and the multiplication processing is performed by the multiplier 10. The correction data of 1 is further multiplied by the multiplier 10.

The contents of the correction data memory 9 are rewritten with the horizontal and vertical correction data obtained by these multiplication processes as new correction data. The correction data written in the correction data memory 9 is read by the control signal of the control circuit 7, and based on the read correction data,
The correction data for each scanning line between the adjustment points in the vertical direction is obtained by the interpolation calculation circuit 12, and this output is used as the D / A converter 1.
Converted to analog signal at 3 and low pass filter (LP
F) Smoothing is performed by 14 and amplification by the amplifier 15, and then supplied to the convergence coil for convergence adjustment.

The position information is received again by the television camera 1 and the position information conversion circuit 2 with respect to the adjustment point thus convergence adjusted, and the above operation is performed.
This process is repeated until the positional information on the adjustment point and the positional information on the reference point match, or until the positional information becomes equal to or less than the specified value.

When the adjustment point comes within a range of the reference point while repeating this operation, the vertical correction coefficient is set to 1 in the horizontal adjustment, and the horizontal correction coefficient is set to 1 in the vertical adjustment. Also, adjustment is performed alternately in the horizontal and vertical directions,
When the difference in the horizontal or vertical direction is 0, no adjustment is performed in that direction.

By the above operation, the difference between the horizontal position information and the vertical position information obtained from the subtraction by the subtractor 5 is 0 (zero), that is, the position information of the adjustment point and the position information of the reference point match. When it becomes like this, or when it becomes less than or equal to a specified value (a value that allows the deviation amount of the convergence position information up to a certain range) (it is considered as a match), the match detection circuit 6 as a match determination means The coincidence determination signal is supplied to the control circuit 7, and the control circuit 7 writes the contents of the correction data memory 9 at this time into the convergence adjustment memory 11. Then, the process moves to the convergence adjustment of the next adjustment point, and the correction data at all the adjustment points are written in the convergence adjustment memory 11.

When the writing of the correction data into the convergence adjustment memory 11 at all the adjustment points is completed, the correction data written in the convergence adjustment memory 11 is read by the control signal of the control circuit 7 and read from the convergence adjustment memory 11. Based on the output correction data, the interpolation calculation circuit 12 obtains the correction data for each scanning line between the adjustment points in the vertical direction, and the output interpolation signal is converted into an analog signal by the D / A converter 13. Then, it is smoothed by the low-pass filter (LPF) 14, amplified by the amplifier 15, and then supplied to the convergence coil to perform convergence adjustment and complete the convergence adjustment.

By the same method, the blue convergence adjustment is also performed. In this way, the difference in the position information of the convergence at the adjustment point with respect to the reference point is detected, and the correction coefficient obtained from the detected difference and the correction data are calculated, and the deviation amount of the correction data is 0, or By performing the convergence adjustment until it becomes equal to or less than the specified value, the convergence adjustment can be automatically performed, and, as shown in FIG. 3B, the calculation processing described above, that is, the position obtained by the position detection. By reducing the number of convergences until the convergence of the convergence on the screen by multiplying the correction coefficient obtained by predicting the convergence movement corresponding to the amount of information shift, and shortening the time until the convergence adjustment is completed. You can

[0034]

As described above, according to the present invention, the subtraction processing result in the position information between the adjustment point on the convergence adjustment pattern and its reference point is detected and the subtraction processing result is detected. The calculation processing of the obtained correction coefficient and the correction data that gives the correction current value for the convergence adjustment of the adjustment point is performed, the correction data is updated by this calculation processing result, and the convergence adjustment is performed using this correction data. This process can be repeated until the result of the subtraction process falls within the range in which it can be considered that the adjustment point and its reference point match.

Therefore, it is possible to automate the convergence adjustment, reduce the number of convergences until the convergence is matched on the screen, and shorten the time until the convergence adjustment is completed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a convergence automatic adjustment circuit according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a convergence adjustment pattern.

FIG. 3 is an explanatory diagram of a convergence process of convergence adjustment.

FIG. 4 is a block diagram of a conventional convergence adjustment circuit.

[Explanation of symbols]

 4 Adjustment point memory 5 Subtractor 7 Control circuit 6 Match detection circuit 9 Correction data memory 10 Multiplier 13 D / A converter

Claims (4)

[Claims] 1. A horizontal direction in a horizontal direction at an adjustment point to be a convergence adjustment target on the convergence adjustment pattern, which receives the convergence adjustment pattern displayed as the image on a screen displaying the image through a television camera. Means for storing position information and vertical position information in the vertical direction, means for storing horizontal position information and vertical position information at a reference point at which the adjustment point should be after completion of convergence adjustment, and the stored adjustment points Means for performing a subtraction process between the horizontal position information and the vertical position information between the reference point and the reference point, and the subtraction processing result is in a range where it can be considered that the adjustment point and the reference point do not match,
A means for multiplying a correction coefficient corresponding to the result of the subtraction processing and correction data for supplying a value of a correction current for the convergence adjustment supplied to the convergence coil;
A means for updating the correction data according to the multiplication processing result and storing it as new correction data, and the correction current obtained by converting the new correction data into an analog signal are supplied to the convergence coil and displayed on the screen. Means for correcting the position of the adjustment point on the converged convergence adjustment pattern, and coincidence determination means for determining that the subtraction processing result is in a range in which it can be considered that the adjustment point and the reference point are coincident with each other. And a control means for detecting the determination of the adjustment point and the reference point of the coincidence determination means and saving the correction data at that time as the final value of the correction data at the adjustment point, and the control means. Means for storing the final value of the correction data, and the new value updated for the adjustment point by the multiplication processing result corresponding to the subtraction processing result. The correction data, the position correction process for correcting the position of the screen, said match determining means,
The position correction process is repeated until it is determined that the subtraction processing result is within a range where the adjustment point and the reference point can be considered to be the same, and the position correction processing is performed on the convergence adjustment pattern displayed on the screen. Convergence is performed for all adjustment points, the control means is configured to save the final value of the correction data at all adjustment points, and the convergence adjustment is performed by the final value of the correction data at all adjustment points. Automatic adjustment circuit. 2. The correction coefficient is a correction coefficient obtained by predicting a convergence movement in accordance with a subtraction processing result regarding an adjustment point and a reference point in horizontal adjustment, and a subtraction regarding an adjustment point and a reference point in vertical adjustment. The automatic convergence adjustment circuit according to claim 1, wherein the correction coefficient is obtained by predicting a movement of convergence corresponding to a processing result. 3. In the multiplication processing, when the subtraction processing result is in a range where the adjustment point and the reference point can be regarded as not matching, in the horizontal adjustment, the horizontal correction coefficient corresponding to the subtraction processing result. And the vertical correction coefficient are multiplied, and the result of this multiplication is multiplied by the horizontal correction data. In the vertical adjustment, the horizontal correction coefficient and the vertical correction coefficient corresponding to the subtraction processing result are multiplied, and the result of this multiplication is calculated. 3. The convergence automatic adjustment circuit according to claim 1, wherein the vertical correction data is multiplied by. 4. In the multiplication processing, when the subtraction processing result is in a range where it can be considered that the adjustment point and the reference point match, the vertical correction coefficient in the horizontal adjustment is set to 1 and the vertical correction coefficient in the vertical adjustment is set. The automatic convergence adjustment circuit according to claim 3, wherein the horizontal correction coefficient is 1.