JPH0666952B2 - Digital convergence device - Google Patents

Description

The present invention relates to a digital convergence device for a color television receiver, and it is an object of the present invention to provide a convergence device capable of quick and accurate adjustment.

Generally, in color television receivers, there are three types of red, green, and blue.
Colors are combined on the fluorescent surface or on the projected screen to create a color image.

In this case, accurate alignment of the three colors, that is, convergence adjustment is an important issue that affects image quality.

To correct this positional deviation, a coil for convergence correction is provided separately from the main deflection coil, and a correction current is applied to this coil.

Generally, as a method of obtaining the correction current, a method of obtaining it in an analog manner from the horizontal flyback pulse and the vertical deflection waveform by using passive elements such as L, C, and R is adopted. I have a problem with. As one method for realizing more accurate convergence correction, a method of digitally performing convergence correction is considered.

The means for digitally performing convergence correction will be described with reference to FIG. 1. The concept is to project a convergence correction pattern such as dots on the screen, and data for the convergence correction amount for each point. Is digitally written in one frame memory, this information is read out, D / A converted, and convergence correction is performed. A more detailed description will be given below with reference to FIGS. 1 and 2.

First of all, as shown in FIG.
The pattern generator 16 projects an adjustment pattern such as dots indicating adjustment points in five columns in the vertical direction. The address of the adjustment point selected by the cursor key is stored in the cursor counter 13 by selecting the adjustment point of the place to be adjusted with the cursor key 17 of the control panel 1. Next, set the desired data in the data reversible counter 2 while looking at the screen with the data writing key 18 of the color to be corrected, for example red, and the output of the data reversible counter 2 is designated by the cursor counter 13 of the 1-frame memory 3. Write to the address. The contents of the 1-frame memory 3 at the address selected by the cursor counter 13 are read out to the data reversible counter 2, and when it is desired to further increase the amount of convergence correction, the contents of the data reversible counter 2 are increased. On the contrary, when it is desired to decrease it, the content of the data reversible counter 2 is decreased and desired data is written in the 1-frame memory 3 to perform the write correction. The same applies to all adjustment points on the screen.

Next, reading of the convergence correction amount written in the 1-frame memory 3 will be described. Since the 1-frame memory 3 has only the correction data at the locations corresponding to the adjustment points, it is necessary to interpolate each scanning line between the adjustment points in the vertical direction. To do. For example, the correction data of the adjustment points of the first column is read from the 1-frame memory 3, the horizontal scanning period (1H) is set in the register 4, and then the correction data of the adjustment points of the second column is read from the 1-frame memory 3. Using the correction data of the first and second columns read from the 1-frame memory 3, the correction amount at the scanning line included between the adjustment points of the first and second columns is calculated. Calculated by interpolation. That is, the difference between the correction amount in the first column and the correction amount in the second column is calculated by the subtraction circuit 5,
The multiplication circuit 6 multiplies the weighting coefficient previously written in the coefficient ROM 7 for each scanning line, and the addition circuit 8 adds the result and the correction amount of the second column to perform interpolation. Next, the output signal of the adder circuit 8 is converted into an analog amount by the D / A converter 9, smoothed by the low pass filter (LPF) 10, and supplied to the convergence yoke after amplification. Other green and blue radials,
The same applies to the blue lateral.

However, when a dot pattern for convergence correction is projected and adjustment is performed for each point in this way, it is necessary to visually match the three colors at each adjustment point, which requires a very long time for adjustment. There was a point.

Therefore, the present invention seeks to provide a convergence device that does not have the above-mentioned drawbacks.

FIG. 3 shows a conceptual diagram of a digital convergence device according to the present invention. The deflection circuit 21 generates horizontal and vertical deflection currents in synchronization with an incoming synchronizing signal in the deflection circuit which performs a normal operation, and scans the electron beam through the deflection yoke 22.

The video circuit 27 performs the same operation as a normal receiver, but when the convergence is adjusted, for example, from the pattern generation circuit 16,
Dot pattern as shown in FIG.
It is projected on the screen 32 via 24. Although only one projection type cathode ray tube is shown in FIG. 3, three projection type cathode ray tubes of red, green and blue are used in an ordinary color image receiver.

In FIG. 2, the dot pattern displayed on the screen 32 shows the adjustment points for performing the convergence correction,
The cursor key 17 is used to specify from which adjustment point the convergence correction is performed. The television camera 30 synchronized with the deflection circuit 21 detects the convergence deviation, and the detection signal automatically writes the convergence correction amount into the memory of the digital convergence unit 24. When the convergence correction of a certain adjustment point is completed, the match detection signal from the convergence match detection unit 31 is applied to the pattern generator 16 through the end display counter 28, and the completion of the convergence correction of the adjustment point is displayed on the screen 32. .

Next, the cursor key 17 is pressed to specify the next adjustment point to perform convergence correction, and the same correction is repeated thereafter to perform convergence correction over the entire screen.

FIG. 4 shows the configuration of an embodiment of the present invention.

The same operations as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The operation of the embodiment shown in FIG. 4 will be described with reference to FIG.

FIG. 5a shows the entire screen, and dot signals are projected as convergence adjustment pattern signals. In this example, there are a total of 35 adjustment points, 7 in the horizontal direction and 5 in the vertical direction. These 35 adjustment points can be specified with the cursor keys.
You can set any adjustment point with 17. The camera controller 29 converts the adjustment point signal from the cursor key 17 into vertical angle information and horizontal angle information, and the television camera 30 aims at adjustment. That is, in Fig. 5a, the television camera 30 is directed to the adjustment point A at the upper left, and an enlarged image as shown in Fig. 5b is obtained. At the same time, this adjustment point signal is also applied to the write address counter 14. The write address counter 14 addresses, via the multiplexer 11, the address corresponding to the adjustment point of the one-frame memory 3 for digitally storing the correction amount data representing the convergence correction amount of each adjustment point. In this way, when the adjustment point is designated by the cursor key 17, the television camera 30 is automatically controlled to magnify and image the designated adjustment point.

For ease of understanding, it is assumed here that there is a convergence shift between red and green as shown in FIG. 5B, and red is matched with green to perform convergence correction.

Generated by the pattern generation circuit 16 and displayed on the screen 32,
When the color of the dot pattern is switched by the color switching signal from the color signal switching device 36, for example, between green and red for each field, the signal is photoelectrically converted by the television camera 30 and a signal as shown in FIG. 5c is obtained. From these signals, the green position detection circuit 34
Thus, the position of the television camera 30 on the screen is detected as a certain reference point, for example, the time t _G from the horizontal synchronizing signal. Next, the red position detection circuit 33 similarly detects the position of red as t _R.

The comparator 35 compares the contents of the green position detection circuit 34 and the contents of the red position detection circuit 33, and if they match, the comparator 35 generates a match signal. While this coincidence signal is not output, the contents of the data reversible counter 2 are continuously corrected, and the contents of the data reversible counter 2 are transferred to and stored in the 1-frame memory 3. Next, this content is read out, and the red dot approaches the point B in FIG. 5b on the screen. When the point B in FIG. 5B is reached, the above-mentioned coincidence signal is generated from the comparator 35, the correction of the data reversible counter 2 is completed, and the horizontal and horizontal convergence correction of green and red is completed. At the same time, the match signal from the comparator 35 indicates that the end display counter 28
Is added to and counted.

Next, regarding the convergence correction in the vertical direction, although not shown in FIG. 4, similarly to the horizontal direction, this time, the time from the vertical synchronization signal is detected to match the red color with the green color. Similarly, a coincidence signal is added from the comparator 35 to the end display counter 28 and counted.

Next, for the convergence correction of blue and green, the pattern generation is performed by the color switching signal applied to the pattern generation circuit 16 by the coincidence signal from the comparator 35 output when the above-mentioned red and green are coincident in the horizontal direction and the vertical direction. From the circuit 16, green and blue dot patterns are displayed on the screen for each field. Similar to the above-described red and green convergence correction, the blue and green match. Similarly, a match signal from the horizontal blue comparator 35,
A match signal from the blue vertical comparator 35 is added to the end display counter and counted.

The operation of the end display counter 28 is output when the convergence correction of each adjustment point is completed, and the output signal controls the pattern generator 16 to display the end of each adjustment point.

That is, 4 is output when the end display counter 28 receives the red horizontal match signal, the red vertical arrival signal, the blue horizontal match signal, and the blue vertical match signal from the comparator 35. It is a progressive counter and controls the pattern generator 16 by the output signal. When the convergence correction of the adjustment point A of the dot pattern in FIG. 5A is completed, the pattern generator 16 is controlled by the output signal of the completion display counter 28 to display the completion of the convergence adjustment of each adjustment point. As shown in FIG. 5d, the dot signal at the adjustment point A disappears, and the adjustment point A
The end of the convergence correction of the points is displayed.

With the operation described above, when the convergence correction of the point A is completed and the end is displayed on the screen, the cursor key 17 is then operated to indicate the next adjustment point, and the operation as described above is performed. The television camera 30 images the next adjustment point, and the 1-frame memory 3 is also addressed with the address corresponding to the adjustment point.

The above operation is repeated, and the full screen 35 shown in FIG.
Convergence correction of points is performed.

FIG. 6 shows the configuration of the second embodiment of the present invention. Those having the same operations as those in FIG. 4 are designated by the same reference numerals and the description thereof is omitted.

As described above, the operation of the end display counter 28 is a quaternary counter that counts the end of the convergence correction at each adjustment point, and the pattern generator 16 is controlled by the output signal of the end display counter 28 to The end of the convergence correction of the adjustment point is displayed on the screen. When the convergence correction of each adjustment point is completed, there is no dot signal corresponding to each adjustment point, and the end display of each adjustment point is displayed.

In the second embodiment, not only the convergence correction completion display for each adjustment point described above is displayed, but also the convergence correction completion display for all adjustment points is displayed.

Although the end the display counter 28 is a 4-ary counter, full screen end indication counter 37 A ₃₅ from the adjustment point A1 in Figure 7 a
It is a 35-ary counter that can count.

That is, the output signals from the end display counter 28 from the adjustment points A ₁ to A ₃₅ are added to the full screen end display counter 37, and when the convergence correction of all the adjustment points is completed, the output signal of the full screen end counter 37 , Pattern generator
16 is controlled to display the end of convergence correction of all adjustment points. For example, as shown in FIG. 7b, a crosshatch signal is displayed as a display means for indicating the completion of the convergence correction of all the adjustment points to display the end of the convergence correction of all the adjustment points.

As described above, before the convergence correction, the dot patterns A _{1 to} A ₃₅ are displayed on the screen as shown in FIG. 7a, and each time the convergence correction of each adjustment point is completed, the corresponding adjustment point is corresponded. The dot signal to be used disappears, and the convergence correction end at each adjustment point is displayed. When the convergence correction of all the adjustment points is completed, a crosshatch pattern is displayed on the screen as shown in FIG. 7B, and the completion of the convergence correction of all the adjustment points is displayed.

Although the projection type color image receiver has been described here for easy understanding, it goes without saying that it is also effective for a shadow mask type direct-view type picture tube.

As is clear from the above description, according to the digital convergence device of the present invention, the convergence correction can be automatically performed at any adjustment point by the designation of the cursor key, and the image sensor can be manually operated in the adjustment point direction. It is not necessary to perform strict tilt adjustment for performing high-precision adjustment by installing the device and the scanning direction of the image receiver and the imaging direction of the image sensor, so that high-precision automatic adjustment can be realized in a short time. Further, the convergence correction completion of each adjustment point is deleted by sequentially deleting the dot pattern of each adjustment point to display the completion, so that the convergence adjustment completed adjustment point becomes clear, and automatic adjustment can be efficiently performed. Further, when the convergence correction of all the adjustment points is completed, the completion of the convergence correction of all the adjustment points becomes clear by means of displaying, for example, a hatch signal different from the adjustment pattern on the entire screen and displaying the completion. As described above, since the information on the end display of each adjustment point and the end display of all adjustment points is obtained, the end of the convergence correction becomes clear, and the adjustment points for which the convergence correction has been completed are readjusted. Since time is wasted, convergence correction can be performed quickly and accurately.

[Brief description of drawings]

FIG. 1 is a block diagram of a digital convergence device in a conventional example, FIG. 2 is a diagram showing adjustment points of the same device, FIG. 3 is a diagram showing a concept of the digital convergence device of the present invention, and FIG. FIG. 5 is a block diagram of the digital convergence device in one embodiment, FIGS. 5A, 5B, 5C, and 5D are screen diagrams and waveform diagrams for explaining the operation of the device.
FIG. 6 is a block diagram of a digital convergence apparatus in the other embodiment, and FIGS. 7A and 7B are screen views for explaining the operation of the apparatus. 2 ... Data reversible counter, 3 ... 1 frame memory,
9 …… D / A, 10 …… LPF, 11 …… Multiplexer,
14 …… Write address counter, 15 …… Read address counter, 16 …… Pattern generator, 17 …… Cursor keys, 19 …… Interpolation processing section, 21 …… Camera control section, 30 ……
TV camera, 28 ... end display counter, 33 ... red position detection circuit, 34 ... green position detection circuit, 35 ... comparator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Mitsuda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Katsumi Adachi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 56) References JP-A-50-93324 (JP, A) JP-A-54-53919 (JP, A) JP-A-55-21699 (JP, A) JP-A-55-163980 (JP, A)

Claims (1)

[Claims] 1. A generation means for generating a dot pattern corresponding to a plurality of convergence adjustment points in a horizontal direction and a vertical direction on a screen of a color cathode ray tube, and a position of a point to be adjusted among the plurality of adjustment points. An input unit for inputting information and a convergence deviation between the adjustment points are detected by an image sensor or a photoelectric conversion element, the detected convergence correction data is written in one frame memory, and the correction data in the one frame memory is read out. In a digital convergence device for performing convergence correction, variable image pickup means for sequentially varying the image pickup direction based on position information from the input means, and detection means for detecting the positions of a reference signal and a reference signal from the image pickup means. And at least one adjustment, which has a comparison means for comparing the reference detection signal and the reference signal. With the detection means for detecting the end of the convergence correction, the dot patterns of the adjustment points at the end of the correction are sequentially deleted, and when the correction of all the adjustment points is completed, a signal different from the dot pattern is displayed to correct the convergence of the adjustment points. A digital convergence device characterized by having display means for displaying information on termination.