JPS63209389A - Convergence device - Google Patents

Abstract

PURPOSE:To automatically execute a static convergence correction in a state displaying an image by providing a means which control so as to increase the quantity of light received by a position detection means. CONSTITUTION:When static convergence deviation is generated by temperature or the like after finishing convergence adjustment, a scanning speed control circuit 36 controls the luminous flux of a pattern signal received on the position detector 30 and 31 provided on the peripheral part of a screen to be compressed. As the result, the quantity of the light received by the detectors 30 and 31 is increased and the positional deviation can be accurately and sensitively detected by storing a green color and a red color pattern with a memory circuit 32 and comparing 33 with them. By this detection signal, a convergence circuit 34 is controlled. Thus the static convergence correction can be automatically executed in the state displaying the video on the screen.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used to adjust the convergence of a color television receiver, and after the dynamic convergence adjustment, the convergence that statically moves depending on temperature etc. is automatically adjusted. It is related to the device.

Conventional technology In general, in a projection type color receiver that uses three projection tubes that emit three primary colors to project enlarged images onto a screen, the angle of incidence of the projection tubes on the screen is different for each projection tube, which causes color shift on the screen. arise. The superposition of these three primary colors, so-called convergence, can be achieved by creating a convergence correction waveform in an analog manner in synchronization with the horizontal and vertical scanning cycles, and adjusting it by changing the size and shape of this waveform. However, there is a problem with convergence accuracy. Therefore, as a method with high convergence accuracy, for example, Japanese Patent Publication No. 59-8114 has been proposed, as well as a digital convergence device that can shorten adjustment time, simplify work, and perform automatic adjustment, as disclosed in Japanese Patent No. 1, 1982-61552. There is.

A first method of the conventional convergence device will be described below. Figure 11 shows a configuration diagram of a conventional digital convergence device, in which a grid pattern etc. (
Project the convergence correction pattern (shown in Figure 12), digitally write the convergence correction amount data for each adjustment point in one frame memory, read out this data and perform D/A conversion to perform convergence correction. It is something.

First, as shown in Figure 12, for example, 9 lines in the horizontal direction are displayed on the screen.
A grid pattern in seven columns in the vertical direction is projected by a pattern projection circuit 1. The horizontal signal 14 of this pattern signal is
It is generated by supplying a horizontal synchronizing signal 2 synchronized with screen scanning to a horizontal address counter circuit 3 composed of a PLL circuit and a frequency dividing circuit. Further, a vertical signal 16 is generated by a vertical address counter circuit 6 which is reset by a vertical synchronizing signal 4, and is supplied to a pattern projection circuit 1 and displayed.

Cursor keys on the second control panel 8 (not shown)
The grid point of the place you want to correct and the corrected color,
For example, select red. The address of the grid point selected with the cursor keys (hereinafter referred to as adjustment point) is stored in the write address generation circuit 7, and is supplied to the frame memory 11 via the frame memory control circuit 1o, and the correction data of the adjustment point specified with the cursor keys is sent to the frame memory 11. is read from the frame memory 11,
Write to data reversible counter 9. Furthermore, by operating a write key (not shown) on the control panel 8, the data reversible counter e is increased or decreased, and the write correction is performed in the frame memory 11. Next, reading out the convergence correction data written in the frame memory 11 will be explained. The horizontal and vertical addresses corresponding to the screen adjustment points are 5/.-7 synchronized with the screen scan.A horizontal address counter circuit 3 receives a horizontal synchronization signal 2 as an input, and a vertical address counter circuit 6 receives a vertical synchronization signal 4 as an input. and read address generation circuit 6
The correction data for each adjustment point is read out in addition to the frame memory 11 via the frame memory control circuit 1o. Since the frame memory 11 stores only correction data for locations corresponding to each adjustment point, the vertical interpolation circuit 12 performs interpolation between adjustment points in the vertical direction. The vertical interpolation circuit 12 is composed of a subtraction circuit, a coefficient ROM, a multiplication circuit, an addition circuit, etc., and its operation is performed by, for example, the second row 16 and the third row 16.
A subtraction circuit calculates the difference from the correction data of the two adjustment points in line 17, a multiplication circuit multiplies the weighting coefficient for each scanning line that is written in advance in the coefficient ROM, and the result is used in the second adjustment point.
The correction data on line 17 is added by an adding circuit to perform interpolation. The output of the vertical interpolation circuit 12 operating as described above is
The /A conversion circuit 13 converts the signal into an analog quantity to obtain a step-wave signal. The signal between adjustment points in the horizontal direction is smoothed by a low-pass filter (6, not shown) according to the amount of correction at each row of adjustment points, and after being amplified, is supplied to a convergence yoke.

As mentioned above, in the conventional method, for each adjustment point,
Since the corrections can be performed independently, convergence correction can be performed with high accuracy.

Next, the second conventional method will be explained using FIG.

In FIG. 13, 18 is a projection tube, 19 is a projection lens,
2o is a screen, 21 is a deflection yoke, and 22 is a convergence yoke. 23 amplifies the video signal arriving at the video signal input terminal to a necessary amplitude in the video circuit 24 and drives the projection tube 18. The video circuit 24 performs the same operation as a normal receiver, but at the time of ':17 convergence Z adjustment, a convergence adjustment pattern such as a lattice pattern created by the f digital convergence circuit 25 is supplied and displayed.

This convergence circuit 25 is the same as that explained in the conventional method 1, so its explanation will be omitted. The deflection circuit 27 and the deflection yoke 21 eclipse the electron beam of the projection tube 18 with the incoming synchronization signal 26. No. 137t\-/ Although the figure shows only one projection tube 18, three projection tubes, red, green, and blue, are normally used in a color receiver.

The adjustment pattern detector 28 performs light detection using a camera or the like, detects the convergence adjustment pattern projected on the screen, and supplies it to the adjustment point detection circuit 29. The adjustment point detection circuit 29 detects a convergence shift at each adjustment point, changes the correction amount of the digital convergence circuit 25 based on a signal of the convergence shift, and automatically performs convergence adjustment.

Furthermore, as a method of automatic adjustment, there is a method of correcting the convergence shift using a screen equipped with a photodetector, but the explanation thereof will be omitted.

Problems to be Solved by the Invention However, although the convergence device configured as described above can perform convergence adjustment with high accuracy, static convergence drift may occur due to the ambient temperature of the power-on device or display device, etc. Color shift occurs. This static convergence drift is caused by neck charge of the projection tube, gun center drift, etc., or DC drift of the convergence output circuit.

This is a combination of thermal deformation of the convergence yoke, changes in the deflection and focus system, etc. Therefore, when adjusting convergence with high accuracy using conventional analog and digital methods, it is necessary to perform the adjustment after sufficient heat run of the display device. Furthermore, there is a problem in that static deviations that occur after power is turned on or due to temperature rise require that functions such as static and centering be provided and adjusted each time.

In view of the above, it is an object of the present invention to provide a convergence device that accurately detects static color shift and automatically performs static convergence correction while an image is displayed.

Means for Solving the Problems The present invention provides position detection means for detecting positional deviation using photoelectric conversion elements provided at the periphery of the screen, and a position on the screen where the pattern signal can be received by the position detection means. -1 a pattern generating means that generates a pattern at each position, a light flux control means that compresses the light flux of the pattern signal so that the amount of light received by the position detection means is increased, and a storage means that stores position data from the position detection means; A convergence device includes a comparison device that compares position data from the storage device, and a convergence correction device that controls a convergence correction device based on the output from the comparison device.

Effect: With the above-described configuration, the present invention compresses the light flux of the pattern signal received on the position detector provided at the periphery of the screen when a static convergence deviation occurs due to temperature etc. after the convergence adjustment is completed. By controlling the sensor to detect positional deviations with high precision and sensitivity, and controlling the convergence circuit with the detection signal, static convergence correction can be automatically performed while an image is displayed on the screen. .

Embodiment FIG. 1 shows a block diagram of a convergence device in a first embodiment of the present invention. Go to No. 1o-7 In Figure 1, 36 is a pattern generation circuit that generates a pattern signal for detecting a convergence shift, 30.3
1 is a position detector for detecting convergence deviation,
Reference numeral 36 denotes a scanning speed control circuit 32 for compressing the light flux of the pattern signal received by the position detector 30 and 31 by, for example, the scanning speed of deflection.
30 is a storage circuit for storing position data from the position detector 31, 33 is a comparison circuit for comparing the position data from the storage circuit 32, and 34 is a static convergence correction by the output signal from the comparison circuit 33. This is a convergence correction circuit that performs the following: In the same figure, components that operate in the same manner as in the prior art are designated by the same numerals and their explanations will be omitted.

The operation of the convergence device of this embodiment configured as described above will be described below.

Convergence adjustment for the entire screen is performed by the digital convergence circuit 26 or analog convergence circuit in the same manner as in the past, and after the adjustment is completed, the pattern generation circuit 35 displays pattern signals of each color passing through the position detectors 30 and 31. . Figure 2 shows the position detector 30.
The pattern signal 37.38 passing through 31 is shown. Immediately after the convergence adjustment is completed, the same position is scanned without any deviation of each color. The position detectors 30 and 31 detect the position, and this position data is stored in the storage circuit 32. The output signal from the memory circuit 32 is supplied to a comparison circuit 33, where it is compared with a position signal serving as reference data, such as a green pattern signal. The output from the comparison circuit 33 is supplied to a convergence correction circuit 34 to control the static deviation amount so that the position is the same as that of the green pattern signal serving as reference data.

Next, in order to explain the operation of the scanning speed control circuit 36 for improving detection accuracy and sensitivity, FIG.

The operation diagram shown in FIG. 4 is used. FIG. 3 shows an enlarged view of the position detector 31 and pattern signal 38 in the screen pressure section of FIG. FIG. 3a shows a screen obtained by normal deflection scanning, in which scanning lines 11 to 49 are located at equal intervals, and pattern signals 38 are signals S1 to 84 on scanning lines 13 to 16.
It is made up of.

The scanning speed control circuit 36 controls only the scanning of the pattern signal 38 on the position detector 31 provided around the screen, and controls the flux of light received by the position detector 31. An auxiliary current as shown in FIG. 4a is superimposed on the v1 period of the vertical deflection current shown in FIG. 4a, and an auxiliary current as shown in FIG. Figure 3a
As shown in FIG. 3, the pattern signals 38 (31 to 84) during normal scanning of
The detection accuracy and sensitivity of the position detector 31 are improved by overlapping the signals and compressing the signal period in the horizontal direction.

Next, the operation when a convergence shift occurs will be explained. For example, the explanation will be given when the red putter signal is shifted upward by 4 degrees, as shown in FIGS. 2 to 5, on the projected screen of the pattern generating circuit 35 after convergence adjustment. Note that the color switching of the turn signal at this time is such that a -7 green pattern signal is outputted from the pattern generation circuit 36 during the first field scanning, and a red pattern signal is outputted from the pattern generation circuit 36 during the second field scanning. The positions of the green pattern signal 39 and red pattern signal 40 from the phase detector 31 are detected, and the green pattern signal 39
The position information corresponding to the red pattern signal 4° is stored in the storage circuit 32. The output signal from the memory circuit 22 is supplied to a comparison circuit 33, which compares the position information of the green pattern signal and the position information of the red pattern signal, which serve as reference information, and sends this comparison output to the convergence correction circuit 34.
The static convergence correction circuit automatically performs static convergence correction by supplying the signal to the red vertical direction static convergence correction circuit and removing the static deviation amount so that it is at the same position as the green pattern signal 39, which is the reference information. Furthermore, the convergence adjustment of the static deviation in the left and right direction can be similarly performed using the position detector 3o. Furthermore, since the process for blue color is similar to that for red color, the explanation will be omitted.

14.\-7 As described above, according to this embodiment, the light flux of the pattern signal received on the position detector provided at the periphery of the screen is compressed by the scanning speed of deflection, and the light beam is received by the position detector. By increasing the amount of light emitted, position detection can be performed with high precision and sensitivity.
By controlling the convergence correction circuit using the detection signal, static convergence adjustment can be performed automatically.

FIG. 6 is a block diagram of a convergence device showing a second embodiment of the present invention. What is different from the configuration shown in FIG. 1 is that as a light flux control means, optical means 43 and 44, for example, use lenses to compress the light flux of the pattern signal so as to increase the amount of light received by the position detectors 31 and 30, thereby increasing the detection accuracy. and improves sensitivity. FIG. 7 shows an enlarged view of the optical system 44 composed of the position detector 31, pattern signal 38, and lens on the left side of the screen in FIG. Figure 8a is
The screen is shown when the optical system 44 is not passed through, and the scanning line l! is shown in the same way as in FIG. 1 to 49 at equal intervals, and the pattern signal 38 is on the scanning line I! It consists of signals S1151\-- on S3 or S16 to S4. An optical system 44 composed of a lens is provided on the position detector 31 and transmits a pattern signal 3 so that the amount of light received by the position detector 31 increases.
By controlling the luminous flux to compress the luminous flux of 8,
As shown in FIG. 8, the pattern signals S1 to 84 of each scanning line are superimposed and the signal period in the horizontal direction is compressed to improve the detection accuracy and sensitivity of the position detector 31.

As described above, according to the present embodiment, the light flux of the pattern signal received on the position detector provided at the periphery of the screen is controlled by the optical system means, and the light flux of the pattern signal is controlled by the optical system means. In the same way as the effect, by performing position detection with high precision and sensitivity and controlling the convergence correction circuit with the detection signal, static convergence adjustment is automatically performed.
can be carried out.

FIG. 9 is a block diagram of a convergence device showing a third embodiment of the present invention. The difference from the configuration shown in FIG. 1 is that a vertical scanning speed control circuit 41 and a horizontal scanning speed control circuit 42 are provided, and a position detector 30 provided horizontally corresponding to the scanning direction of the screen performs sampling on a scanning line. The position detector 31, which is provided perpendicularly to the scanning direction of the screen, controls the scanning speed in the direction orthogonal to the scanning line. That is, by controlling the scanning speed in a direction opposite to the direction detected by the position detectors, the flux of light received by the position detectors 30 and 31 is controlled, thereby improving detection accuracy and sensitivity. Figure 10 shows the position detector 31 located at the periphery of the screen in Figure 2.
．． 30 and an enlarged view of pattern signals 38 and 37 are shown.

FIG. 10a shows a screen obtained by normal deflection scanning of the position detector 31, in which scanning lines 11 to 19 are located at equal intervals, and a pattern signal 38 is composed of signals S1 to 84 on scanning lines 13 to 16. has been done. The horizontal scanning speed control circuit 42 controls the horizontal scanning speed, and as shown in FIG.
The horizontal cutting period (81 to S4) is compressed.

FIG. 10C shows a screen obtained by normal deflection scanning of the position detector 300, and shows the pattern signal 37 (811 to 517).
) are formed from scanning lines e11 to e7 at equal intervals.

The vertical scanning speed control circuit 41 controls the scanning line pitch in the vertical direction, and as shown in FIG.
to '16 pattern signals S12 to S16 are superimposed to control the light flux of the pattern signals.

As described above, according to this embodiment, the direction opposite to the direction detected by the position detector can be easily compressed by controlling the scanning speed of deflection, for example, and compressing the light flux received by the position detector. With this configuration, detection accuracy and sensitivity can be improved, and static convergence adjustment can be performed automatically.

It goes without saying that this method is also effective when controlling the luminous flux using an optical system.

Although static convergence correction has been described here, position detectors may also be provided in contradictory areas around the screen to perform part of the dynamic convergence correction. It goes without saying that a lamp or the like may be used to issue a dynamic convergence adjustment instruction to determine if there is a dynamic deviation and to perform the dynamic convergence adjustment.

Note that although a projection type color receiver has been described here for ease of understanding, it goes without saying that the present invention is also effective for a shadow mask type direct view type receiver.

As described in detail, according to the present invention, when a static deviation occurs in the convergence that has been precisely adjusted by the digital and analog dynamic convergence circuits due to temperature, etc., the state in which an image is displayed on the screen can be adjusted. Automatically performs static convergence correction.

In addition, by compressing the light flux of the pattern signal so that the amount of light received by the position detector increases, detection accuracy and sensitivity are improved, the light receiving area of the position detector is small, and it can be realized with a simple circuit configuration. Its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a convergence device in embodiments of the present invention, FIGS. 2, 3, and 4. FIG. 6 is a diagram for explaining the operation of the same embodiment, FIG. 6 is a block diagram of a convergence device according to another embodiment of the present invention, and FIGS. 7 and 8 are for explaining the operation of the same embodiment. 9 is a block diagram of a convergence device according to another embodiment of the present invention, FIG. 10 is a diagram for explaining the operation of the same embodiment, and FIG. 11 is a block diagram of a conventional digital convergence device. , FIG. 12 is a diagram for explaining the operation of the same circuit, and FIG. 13 is a block diagram of a conventional convergence device that performs automatic convergence adjustment. 34... Convergence correction port M, 32...
...Memory circuit, 33...Comparison circuit, 30.31
...Position detector, 35...Pattern generation circuit, 36...Scanning speed control circuit, 44, 4
3...Optical means 〇 Name of agent Patent attorney Medium
Toshio Oo and 1 other personFigure 2Figure 3Figure 4

Claims (4)

[Claims] (1) A convergence correction means for correcting color shift on the screen, a position detection means for detecting position shift using a photoelectric conversion element provided at the periphery of the screen, and a pattern signal detected by the position detection means. a pattern generating means for generating a pattern at a position on the screen where light can be received; a light flux controlling means for compressing the light flux of the pattern signal so that the amount of light received by the position detecting means is increased; and a position from the output of the position detecting means. A convergence device comprising a storage means for storing data, a comparison means for comparing position data from the storage means, and a control means for controlling the convergence correction means based on an output from the comparison means. (2) The convergence device according to claim 1, wherein the light flux control means controls the deflection based on the scanning speed of the deflection. (3) The convergence device according to claim 1, wherein the light flux control means is controlled by optical means. (4) The convergence device according to claim 1, wherein the light flux control means controls the light flux in a direction opposite to the direction detected by the position detection means.