JPH09149426A - Digital convergence device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably reduce the using capacity of the storing memory of correction data and to reduce time for convergence adjustment without deteriorating the adjusting accuracy of convergence to any kind of signal sources by discriminating the number of adjusting points displayed on a picture and switching the number of correction data of the adjusting point. SOLUTION: At the time of presetting the adjusting point to 1/2 by the operation of a control panel 5, the number of adjusting points discriminating circuit 24 controls multiplexers 21 and 22 so that data read out from 1-frame memory 8 passes through an adjusting point interval interpolation circuit 23. Namely, corresponding to correction accuracy necessitated at the time of convergence adjusting to an input signal, the number of the adjusting points is switched and the number of the adjusting points is preset to increase and reduce the number of the adjusting points based on correction accuracy optimized corresponding to the inputted signal source. Thereby the number of correction data at the time of convergence adjustment is optimized to various kinds of signal sources.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital convergence device for correcting convergence in a color receiver.

[0002]

2. Description of the Related Art For example, a projection-type color television receiver (hereinafter, simply referred to as a color image receiver) is provided in which three projection tubes are provided, and each projection tube emits each of the three primary colors to project an image on a screen in an enlarged manner. (Abbreviated as "machine"), since the incident angle of the projection tube with respect to the screen is different in each projection tube, color shift occurs on the screen. The superimposition of the three primary colors with respect to this color shift, so-called convergence, is adjusted by a method in which a convergence correction waveform is created in an analog manner in synchronization with the horizontal and vertical scanning periods, and the size and shape of this waveform are changed for adjustment. However, there is a problem in terms of convergence accuracy.

Therefore, as a method capable of dealing with various signals and having high convergence accuracy, for example, Japanese Patent Laid-Open No. 60-1 is available.
A digital convergence device as disclosed in Japanese Patent No. 30288 has been proposed.

Such a conventional digital convergence device will be described below with reference to the drawings.
FIG. 7 is a block diagram of a conventional digital convergence device. In FIG. 7, 1 is a read address control unit, 2 is a crosshatch generator, 3 is a video circuit,
Reference numeral 4 is a write address control unit, 5 is a control panel, 6 is a reversible counter, 7 is a multiplexer, 8 is one frame memory, 9 is a register, 10 is a vertical adjustment point processing unit, 11 is a D / A conversion circuit, 12 Is a reduction pass filter (hereinafter referred to as LPF), 13 is a scanning line number detection unit, 1
Reference numeral 4 is an adjustment point number setting unit, 15 is a coefficient calculation unit, 16 is an output amplification unit, and 17 is a deflection circuit.

A digital convergence device having such components displays a convergence correction pattern such as a crosshatch pattern as shown in FIG. 8 on a screen and adjusts the adjustment points, such as points A, B, C, and so on. The data of the convergence correction amount such as D is digitally written in the frame memory, and the correction amount data is read and D / A converted to perform the convergence correction.

The operation of this digital convergence device will be described in detail below. Horizontal / vertical cycle pulse synchronized with the deflection current cycle is used as a sync signal for sync signal input terminal 2
0, which drives the read address controller 1. The crosshatch generator 2 is driven by using the pulse from the read address control unit 1, and the video circuit 3
To display a crosshatch pattern on the projection screen.

On the other hand, the address key of the control panel 5 is used to specify a cross point (for example, point A in FIG. 8) at a position where convergence correction is required, and the position address is set in the write address control section 4. Next, a correction amount is written in the one-frame memory 8 through the reversible counter 6 while looking at the screen with a data writing key of a color to be corrected, for example, a red data writing key provided on the control panel 5.

Normally, the switching control is performed by the multiplexer 7 so that the writing to the one-frame memory 8 is performed during the blanking period of the video signal. Therefore, reading is not impaired. In this way, the same operation is performed at each adjustment point such as points B, C and D.

Next, the reading of the 1-frame memory 8 is as follows.
The read address control unit 4 reads out each adjustment point position on the screen, and the read address control unit 1
The vertical adjustment point processing unit 10 performs correction amount processing between adjustment points in the vertical scanning direction via the register 9 driven by.

Here, in order to correspond to various signal sources having synchronizing signals having different frequencies, the number of scanning lines differs depending on the frequency of the synchronizing signal, and therefore the inter-adjustment point processing corresponding to each number of scanning lines must be performed. There is. Therefore, the synchronization signal input from the synchronization signal input terminal 20 is supplied to the scanning line number detection unit 13 to detect the number of scanning lines in one field,
It is added to the adjustment point number setting unit 14.

In the number-of-adjustment-points setting unit 14, N = M from the number M of scanning lines in one field and the number L of adjustment points in the vertical direction.
The number N of scanning lines between each adjustment point represented by / (L + 1) is calculated and added to the coefficient calculator 15. The number N of scanning lines is
Further, it is also added to the write address control unit 4 and the read address control unit 1, and these operations are switched every N lines.

The output of the vertical adjustment point processing unit 10 operating as described above is input to the D / A conversion circuit 11, where a signal converted into an analog amount is obtained. As the signal between the adjustment points in the horizontal direction, the correction amount of the adjustment points of each row is LPF.
The signal after being smoothed by 12 and amplified by the output amplifier 16 is
Supply to the convergence yoke 18.

Further, the data of one frame memory 8 is stored in the non-volatile memory for each input signal, and the scanning line number detection unit 13
The stored data in the non-volatile memory is switched according to the detection signal from the memory to be expanded into one frame memory, and is added to the deflection circuit 17 as a system switching signal, and the deflection yoke 19
The amplitude and frequency of the deflection due to are switched.

In this way, since the individual correction data for each signal source can be held and the convergence can be corrected independently for each adjustment point, the convergence correction can be performed accurately.

[0015]

However, in the conventional digital convergence apparatus as described above, for example, convergence adjustment is performed for various signal sources having different sync signal frequencies or different image fineness. Although it can be performed with high accuracy, the number of adjustment points is the same regardless of the type of any input signal source, so the number of correction data increases depending on the type of signal source, and the capacity of the nonvolatile memory However, there is a problem in that a large amount is required and the adjustment time is prolonged.

The present invention solves the above problems,
For any kind of signal source, it is possible to significantly reduce the used capacity of the memory for storing the correction data for convergence adjustment without degrading the accuracy of convergence adjustment, and it is necessary for convergence adjustment. It is an object of the present invention to provide a digital convergence device capable of shortening the total time.

[0017]

In order to solve the above problems, a digital convergence apparatus according to a first aspect of the present invention is a digital convergence apparatus which adjusts the horizontal and vertical convergence of a screen in a color television receiver. A convergence device, which stores a plurality of adjustment points for adjusting the convergence and a cursor on the screen, and stores correction data of a digital value corresponding to the convergence correction amount for the convergence adjustment at each adjustment point. Means for reading the correction data in the storage means in synchronism with a synchronization signal input to the receiver, and for each of the vertical directions based on the correction data for each adjustment point read from the storage means. Means for performing an interpolation calculation for obtaining interpolation data which is correction data between the adjustment points; Means for amplifying the convergence correction amount corresponding to the calculated interpolation data and supplying it to the correction coil; means for determining the number of the adjustment points displayed on the screen; and the adjustment according to the determination result. And a means for switching the number of point correction data.

According to a second aspect of the present invention, there is provided a digital convergence apparatus, wherein the storage means of the first aspect is configured to preset data for instructing switching of the number of interpolation data together with the correction data, and the screen of the first aspect. The means for determining the displayed number of adjustment points for convergence adjustment is configured to determine the preset data stored in the storage means.

A digital convergence device according to a third aspect of the present invention is a digital convergence device for adjusting the horizontal and vertical convergence of a screen in a color television receiver, and a plurality of adjustment points for adjusting the convergence. Means for displaying a cursor on the screen, means for storing correction data of digital values corresponding to the convergence correction amount for convergence adjustment at each adjustment point, and correction data in the storage means are input to the receiver. Means for reading in synchronism with a synchronization signal, and interpolation calculation for obtaining interpolation data, which is correction data between the adjustment points in the vertical direction, based on the correction data of the adjustment points read from the storage means. Means for performing the convergence correction amount corresponding to the interpolation data obtained by the interpolation calculation Means for providing amplification to the correction coil, and means for determining a correction number data of the adjusting points on the basis of the vertical amplitude of the input signal input to the receiver,
And a means for switching the number of correction data of the adjustment points according to the determination result.

The digital convergence apparatus according to a fourth aspect is a digital convergence apparatus for adjusting the horizontal and vertical convergence of a screen in a color television receiver, and a plurality of adjustment points for adjusting the convergence. Means for displaying a cursor on the screen, means for storing correction data of digital values corresponding to the convergence correction amount for convergence adjustment at each adjustment point, and correction data in the storage means are input to the receiver. Means for reading in synchronism with a synchronization signal, and interpolation calculation for obtaining interpolation data, which is correction data between the adjustment points in the vertical direction, based on the correction data of the adjustment points read from the storage means. Means for performing the convergence correction amount corresponding to the interpolation data obtained by the interpolation calculation Means for amplifying and supplying to the correction coil, means for determining the correction data number of the adjustment point based on the horizontal frequency and vertical frequency of the input signal input to the receiver, and according to the determination result, And a means for switching the number of correction data of the adjustment points.

According to the above-mentioned structures of claims 1 and 2, the number of the adjustment points is switched according to the correction accuracy required in the convergence adjustment for the input signal,
Preset the number of adjustment points.

As a result, the number of adjustment points is increased or decreased based on the correction accuracy optimized according to the input signal source to optimize the number of correction data for convergence adjustment for various signal sources.

According to the third aspect of the present invention, the screen amplitude is changed as the input signal even if the type of the image changes, such as an overscan TV image or an underscan high definition computer image. Automatically detects the type of video and automatically switches the number of adjustment points required for convergence adjustment for the input signal in accordance with the type of input signal.

Thus, depending on the input signal source,
By appropriately increasing or decreasing the number of adjustment points during the convergence adjustment, the number of correction data during the convergence adjustment is optimized for various signal sources.

According to the structure of claim 4, even if the type of the input signal changes, such as a TV image which is overscan or a computer image of high definition which is underscan, the input signal is changed. By detecting the frequency of the synchronization signal in (1) and determining the type of signal source, the number of convergence adjustment points is automatically switched according to the type of input signal source.

As a result, when the convergence adjustment is performed on the input signal source, the extrapolation point calculation processing optimized according to the input signal source is performed to adjust the convergence on various signal sources. Optimize the number of correction data for.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital convergence device showing an embodiment of the present invention will be described below with reference to the drawings.

A digital convergence device according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram of a digital convergence device according to the first embodiment. In FIG. 1, reference numerals 21 and 22 are multiplexers for turning ON / OFF the interpolation circuit between the adjustment points, 23 is an interpolation circuit between the adjustment points for automatically obtaining correction data between the adjustment points based on the data of the two adjustment points, and 24 is an adjustment A point determination circuit, 25 is a vertical operation circuit for performing calculation between adjustment points in the vertical direction, and 26 is an address control unit for controlling reading and writing of the memory.

FIG. 2 is a block diagram of the adjustment point number discriminating circuit 24 in the first embodiment. In FIG. 2, 27 is a non-volatile memory that stores the number of adjustment points, 28 is a memory reading circuit that reads the non-volatile memory 27 for each input signal, and 29 is the number of adjustment points that is switched based on the data read by the memory reading circuit 28. It is an adjustment point switching circuit that outputs a switching signal for switching.

Further, FIG. 3 shows a relational diagram of display contents (cross hatch and adjustment points) on the screen when the adjustment points are switched in the first embodiment. In FIG. 3, 30 is a crosshatch pattern, 31 is a crosshatch, and 32 is an adjustment point.

In FIG. 1 and FIG. 2, components that operate in the same manner as in the conventional example shown in FIG. 7 are designated by the same reference numerals, and detailed description thereof will be omitted. The operation of the digital convergence device configured as above will be described below.

In FIG. 1, a synchronizing signal is input to a synchronizing signal input terminal 20, an address control unit 26 generates various address signals for controlling the one-frame memory 8, and a crosshatch generator 2 uses As shown in the display screen diagram of No. 3, for example, a horizontal and vertical crosshatch pattern 30 is generated, and the crosshatch pattern 30 is displayed on the screen by the video circuit 3.

Next, when the adjustment point at the place to be corrected and the color to be corrected are selected by the cursor keys (not shown) of the control panel 5, those information correspond to the address of the selected adjustment point. It is stored in the area of the one-frame memory 8.

Here, as shown in FIG. 3A, the digital convergence adjustment points 32 are a, b, c, d, and
If all the intersections of the crosshatch pattern 30 like e, f, and g, the adjustment points are preset to 1/2 by the operation of the control panel 5, the adjustment point number determination circuit 24
However, the multiplexers 21 and 2 are arranged so that the data read from the 1-frame memory 8 passes through the inter-adjustment-point interpolation circuit 23.
2 is controlled. Therefore, for example, the interpolated data of b ′ in FIG. 3B is obtained, for example, by linear approximation in the inter-adjustment-point interpolation circuit 23 based on the correction data of the adjustment points a and c.

Further, the adjustment points such as a and c in FIG.
1 and 22 are controlled. Therefore, the number of adjustment points can be changed by presetting.

In the 1-frame memory 8 in which the data adjusted in this way is written, each adjustment point 32 shown in FIG.
Since only the correction data of the location corresponding to is stored in the vertical operation circuit 25 between the adjustment points in the vertical direction.
Interpolation is performed to create correction data corresponding to each scanning line between adjustment points. Then, the output from the vertical operation circuit 25 is converted into an analog amount by the D / A conversion circuit 11, and LP
In F12, smoothing in the horizontal direction is performed to create a corrected waveform.

The operation of the adjustment point discriminating circuit 24 will now be described. In FIG. 2, when the input signal is optimally projected on the screen and the signal of the cross hatch pattern 30 is output,
As shown in (a) or FIG. 3 (b), when the control panel 5 is operated to set the number of adjustment points to normal or to halve, interpolation calculation between adjustment points is performed (ON) or not performed (OFF). ) Is written in the non-volatile memory 27, the ON / OFF data is read by the memory reading circuit 28, and the adjustment point number switching circuit 29 turns ON / OF the interpolation calculation between adjustment points.
Give the F instruction. Further, since the ON / OFF instruction of the inter-adjustment point interpolation is preset and stored in the non-volatile memory, it is automatically switched for each input signal.

Next, the operation of the inter-adjustment-point interpolation circuit 23 will be described in detail. FIG. 4 shows an operation explanatory diagram of the inter-adjustment-point interpolation circuit 23 in the first embodiment. In FIG. 4A shown corresponding to points a, b ′, and c in the horizontal direction in FIG. 3B, the correction data Da at the point a, which is the adjustment point, is the inter-adjustment-point interpolation circuit 23. Then, the correction data Dc of the point c which is the adjustment point in the screen and the correction data Db of the point b ′ which is the interpolation adjustment point 33 are obtained by linear approximation. The cursor at this time is not displayed at the interpolation adjustment point b ', and interpolation between adjustment points is performed according to the way of displaying the cursor. The adjustment point b'is detected by the control signal from the control panel 5 being supplied to the adjustment point number determination circuit 24 to determine whether the signal is an adjustment point or an interpolation calculation point. It is supplied to the container 2 and the cursor is displayed.

As described above, according to the first embodiment,
By presetting ON / OFF of the adjustment point interpolation calculation for each input signal, the number of adjustment points can be preset for each signal input to the display or the like, and optimum digital convergence adjustment can be performed in an optimum state.

A digital convergence device showing the second embodiment of the present invention will be described. FIG. 5 shows a block diagram of a digital convergence device according to the second embodiment. In FIG. 5, the difference from the first embodiment is that the number of adjustment points is determined by the deflection amplitude. FIG.
34, a deflection amplitude control circuit 34, a reference voltage generation circuit 35 for generating a reference voltage for deflection amplitude control, 36, 37
Is a comparator, 38 is a determination signal for determining the number of adjustment points in the horizontal direction, and 39 is a determination signal for determining the number of adjustment points in the vertical direction. In FIG. 5, components that operate in the same manner as in FIG. 1 and FIG. 7 showing the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

The operation of the digital convergence device configured as described above will be described below. The description of the switching operation of the interpolation calculation between the adjustment points between the control panel 5 and the 1-frame memory 8 is the same as that of the first embodiment, and will be omitted.

A signal is input to the image receiver, and based on this signal, the deflection amplitude control circuit 34 controls the deflection circuit 17 so that the deflection yoke 19 adjusts the horizontal amplitude of the screen. The voltage changes. Since the reference voltage for deflection amplitude control when the adjustment point at the end in the horizontal direction is on the screen frame is applied to the + side of the comparator 36 from the reference voltage generation circuit 35, the adjustment point at the end is inside or outside the screen. Whether or not can be determined by whether the output voltage from the comparator 36 is + or −. This output voltage is used as the discrimination signal 38, and the discrimination signal 38 turns ON / OFF the interpolation calculation between the adjustment points in the horizontal direction.

Similarly, in the vertical direction, the comparator 3
The output voltage of 7 is used as the discrimination signal 39, and the discrimination signal 39 turns ON / OFF the interpolation calculation between the adjustment points in the vertical direction.

In this way, the number of adjustment points can be determined by comparing the screen amplitude for each input signal with the reference amplitude, and the interpolation calculation of the adjustment points can be turned ON / OFF. A digital convergence device according to the third embodiment of the present invention will be described.

FIG. 6 is a block diagram of a digital convergence device according to the third embodiment. In FIG. 6, the difference from the first embodiment is that the number of adjustment points is determined by the frequency of the input signal. In FIG. 6, 40a is a horizontal synchronizing signal, 40b is a vertical synchronizing signal, 41 is a reference clock generator, 42 is a counter for counting the horizontal frequency, 43 is a frequency divider for lowering the frequency of the reference clock, and 44 is the vertical frequency. Counter, 45 is a horizontal frequency discriminating circuit, 46 is a vertical frequency discriminating circuit, 47
Is an input signal discriminating circuit for discriminating an input signal according to a horizontal frequency and a vertical frequency. In addition, in FIG.
7, which operate in the same manner as in the conventional example shown in FIG.

The operation of the digital convergence device configured as described above will be described below. The description of the switching operation of the adjustment point interpolation calculation between the control panel 5 and the 1-frame memory 8 is omitted since it is the same as that of the first embodiment.

When a signal is input to the receiver, the horizontal synchronizing signal 40a is counted by the counter 42 by the reference clock input from the reference clock generator 41. The frequency of the horizontal synchronizing signal is discriminated by the horizontal frequency discriminating circuit 45 based on the data thus counted.

Similarly, the vertical synchronizing signal 40b is also counted by the counter 44 by the clock whose frequency is reduced by the frequency divider 43 from the reference clock input from the reference clock generator 41. The vertical frequency determining circuit 46 determines the frequency of the vertical synchronizing signal based on the data thus counted.

The input signal discriminating circuit 47 discriminates the number of adjustment points on the basis of the horizontal frequency data and the vertical frequency data, outputs an interpolating calculation ON / OFF signal, and automatically turns ON / OFF the interpolating calculation. You can

In the above first, second and third embodiments, the projection type color image receiver has been described for easy understanding, but the same applies to the shadow mask type direct view type image receiver. It goes without saying that it is effective for.

[0051]

As described above, according to the present invention, the number of adjustment points is switched and the number of adjustment points is preset according to the correction accuracy required in the convergence adjustment for the input signal. By increasing or decreasing the number of adjustment points based on the correction accuracy optimized according to the input signal source, the number of correction data at the time of convergence adjustment can be optimized for various signal sources.

Further, as the input signal, even if the type of image changes, such as a TV image which is overscan and a high definition computer image which is underscan, the type of image is automatically changed according to the screen amplitude. The number of adjustment points required for convergence adjustment is automatically switched according to the type of input signal detected, and the number of adjustment points for convergence adjustment is then changed according to the input signal source. By properly increasing or decreasing, the number of correction data at the time of convergence adjustment can be optimized for various signal sources.

Further, as the input signal, the frequency of the synchronizing signal in the input signal is detected even if the type of the image changes, such as a TV image that is overscanned or a computer image of high definition that is underscanned. By determining the type of signal source by using the input signal source, the adjustment point switching process is automatically executed according to the type of the input signal source.
As a result, when performing convergence adjustment for the input signal source, correction data during convergence adjustment for various signal sources is obtained by performing adjustment point calculation processing that is optimized according to the input signal source. The number can be optimized.

Therefore, for any type of signal source, the used capacity of the memory for storing the correction data for convergence adjustment can be significantly reduced without lowering the convergence adjustment accuracy. Also, the time required for convergence adjustment can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital convergence device according to a first embodiment of this invention.

FIG. 2 is a block diagram of an adjustment point number determination circuit according to the same embodiment.

FIG. 3 is a relationship diagram of display contents when switching the number of adjustment points according to the same embodiment.

FIG. 4 is an operation explanatory diagram of the inter-adjustment-point interpolation circuit of the same embodiment.

FIG. 5 is a block diagram of a digital convergence device according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a digital convergence device according to a third embodiment of the present invention.

FIG. 7 is a block diagram of a conventional digital convergence device.

FIG. 8 is an operation explanatory diagram of the conventional digital convergence device.

[Explanation of symbols]

 2 crosshatch generator 3 video circuit 11 D / A conversion circuit 12 LPF 16 output amplification unit 23 inter-adjustment point interpolation circuit 24 adjustment point number determination circuit 25 vertical operation circuit 27 non-volatile memory 28 memory read circuit 29 adjustment point switching circuit 36, 37 comparator 47 input signal discrimination circuit

Claims (4)

[Claims] 1. A digital convergence device for adjusting the horizontal and vertical convergence of a screen in a color television receiver, and means for displaying a plurality of adjustment points and cursors for the convergence adjustment on the screen. Means for storing correction data of a digital value corresponding to a convergence correction amount for convergence adjustment at each adjustment point, and means for reading the correction data in the storage means in synchronization with a synchronization signal input to the receiver And means for performing an interpolation calculation for obtaining interpolation data which is correction data between the adjustment points in the vertical direction based on the correction data of the adjustment points read from the storage means, and the interpolation calculation. A means for amplifying a convergence correction amount corresponding to the interpolation data and supplying it to the correction coil; A digital convergence device comprising means for discriminating the number of the adjustment points displayed on the display, and means for switching the number of correction data of the adjustment points according to the discrimination result. 2. The storage means is configured to preset save data together with correction data for instructing switching of the number of interpolation data, and means for determining the number of adjustment points for convergence adjustment displayed on the screen, The digital convergence device according to claim 1, wherein the digital convergence device is configured to discriminate preset data stored in the storage means. 3. A digital convergence device for adjusting the horizontal and vertical convergence of a screen in a color television receiver, and means for displaying a plurality of adjustment points and cursors for the convergence adjustment on the screen. Means for storing correction data of a digital value corresponding to a convergence correction amount for convergence adjustment at each adjustment point, and means for reading the correction data in the storage means in synchronization with a synchronization signal input to the receiver And means for performing an interpolation calculation for obtaining interpolation data which is correction data between the adjustment points in the vertical direction based on the correction data of the adjustment points read from the storage means, and the interpolation calculation. Means for amplifying a convergence correction amount corresponding to the interpolation data and supplying it to the correction coil; Digital Convergence comprising means for discriminating the number of correction data of the adjustment points based on the amount of vertical amplitude of the input signal input to the machine, and means for switching the number of correction data of the adjustment points according to the discrimination result. apparatus. 4. A digital convergence device for adjusting the horizontal and vertical convergence of a screen in a color television receiver, and means for displaying a plurality of adjustment points and cursors for the convergence adjustment on the screen. Means for storing correction data of a digital value corresponding to a convergence correction amount for convergence adjustment at each adjustment point, and means for reading the correction data in the storage means in synchronization with a synchronization signal input to the receiver And means for performing an interpolation calculation for obtaining interpolation data which is correction data between the adjustment points in the vertical direction based on the correction data of the adjustment points read from the storage means, and the interpolation calculation. Means for amplifying a convergence correction amount corresponding to the interpolation data and supplying it to the correction coil; Means for determining the number of quantization bits of the correction data of the adjustment point based on the horizontal frequency and the vertical frequency of the input signal input to the machine, and means for switching the number of correction data of the adjustment point according to the determination result. And a digital convergence device.