JPH0923442A - Cathode-ray tube controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically execute various corrections in a color television receiver, to realize highly precise correction and to drastically shorten adjusting time. SOLUTION: Plural index phosphors 6 are arranged on the surface of a shadow mask 4 so that the intervals of adjacent two points become narrow in accordance with the increase of a polarizing angle. Radiation output is changed in accordance with the scanning of an electronic beam and the radiation output is detected by a photoelectric conversion element provided in a cathode- ray tube. A test signal modulated by the electronic gun 2 of G is set to be a reference signal, test signals modulated by the electronic guns 1 and 3 of R and G are set to be convergence signals, the light emission of the index phosphors 6 is set to be an index signal and the two-dimensional position of the signal is detected. A geometrical distortion and convergence are corrected by using position information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube controller for automatically correcting various image distortions in a color television receiver.

[0002]

2. Description of the Related Art Generally, in a cathode ray tube receiver which displays an image of three primary colors using three electron guns, the electron beam from the electron gun is disturbed by a peripheral magnetic field, and three electron beams are used. Geometrical distortion and convergence shift occur on the display screen due to the reason that the angle of incidence on the display screen differs depending on the curvature of the display screen and the like. As various correction methods for these image distortions, an analog correction waveform is created in synchronism with the horizontal and vertical scanning periods, and the size and shape of this waveform are changed for adjustment. I have a problem with. Further, in such a method, since various deviations of the image on the screen are visually observed and manually corrected, there is a problem that the adjustment takes time.

Therefore, as a method for performing high-precision convergence correction, a digital convergence device is proposed in Japanese Patent Publication No. 59-8114. Further, as a method of automatically correcting the deflection distortion, a cathode ray tube control device and an electron beam deflection control device have been proposed in JP-A-58-25042 and JP-A-58-24186, respectively.

FIG. 19 is a block diagram of a conventional cathode ray tube control device capable of automatically correcting image distortion. See also FIG.
An external view of the shadow mask 50 coated with the index phosphor is shown in (a), and the index phosphor 5 is shown in (b).
1 shows a pattern diagram of 1. As shown in FIG. 20B, the index phosphor 51 is a detection element including a vertical linear body 51a and an oblique linear body 51b. Then, as shown in FIG. 20A, a large number of index phosphors 51 are applied in a matrix on a rectangular shadow mask 50.

In the cathode ray tube 52 shown in FIG. 19, a convergence yoke 53 and a deflection yoke 54 are attached to the electron gun and the neck portion. A waveform generator 55 is connected to these yokes, and a horizontal deflection waveform and a vertical deflection waveform are applied based on the synchronizing signal. The electron beam emitted from the electron gun is deflected by the deflection yoke 54, and the position is controlled by the convergence yoke 53 so that the RGB electron beams are converged by the shadow mask 50.
Then, the RGB electron beams land on the screen on which the RGB phosphors are applied in a matrix.

When the electron beam arrives at the index phosphor 51, the detector 56 detects the arrival position of the electron beam by the emission of the index phosphor 51. The test signal generator not shown in FIG.
9 is generated. The electron beam whose brightness is modulated by this test signal scans the index phosphor 51 in the horizontal direction.
The processing device 57 measures the time interval from the output of the test signal 58 or 59 to the light emission of the vertical linear body 51a, and the time interval from the emission of the vertical linear body 51a to the emission of the oblique linear body 51b. To measure. Then, the processing device 57 creates signals for geometrical distortion correction and convergence correction from the measured values.

The waveform generator 55 receives the correction signal output from the processing unit 57, and then converges the convergence yoke 5.
3 and each scanning waveform for driving the deflection yoke 54 are generated, and geometrical distortion and convergence deviation are automatically corrected.

[0008]

However, in recent years, however,
The flattening of the screen of the cathode ray tube is progressing, and the deflection angle is increasing because the overall length is shortened. In such a cathode ray tube,
As shown in FIG. 21, in the peripheral portion of the phosphor screen 60, which is the display screen, in order to increase the margin for deterioration of color purity, the distance between the shadow mask 50 and the phosphor screen 60 is set to the peripheral portion compared to the central portion. I am making it big. Therefore, even if the geometrical distortion and the convergence deviation are corrected on the shadow mask 50 by using the conventional configuration, the distortion occurs on the screen.

Further, as shown in FIG. 22 (a), the horizontal and vertical geometric distortions and convergence deviations are large, the test signal 58 or 59 is curved, and the projected position thereof is the index phosphor 51. If it deviates significantly from the position of,
Will not be hit at all. Further, as shown in FIG. 22B, the test signal 59 may hit only one of the two oblique linear members of the index phosphor 51. In this case, a signal is not output from the photoelectric conversion element of the detector 56, and there is a problem that the amount of distortion cannot be measured.

Further, as compared with the case where the test signal 58 having no geometrical distortion is horizontally projected as shown in FIG. 23A, the test signal 58 is obliquely scanned as shown in FIG. 23B. When such deflection distortion occurs, the same input can be obtained in the photoelectric conversion element, and as a result, there is a problem that the distortion amount cannot be specified.

The present invention has been made in view of the above conventional problems, and a plurality of index phosphors of a shadow mask are arranged so that the intervals become narrower as the deflection angle increases. Accordingly, it is an object of the present invention to provide a cathode ray tube display device that automatically and accurately corrects geometric distortion and deviation of convergence even if the screen is close to a flat body.

[0012]

According to a first aspect of the present invention, there is provided a screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen, and between the electron gun and the screen. A cathode ray tube including a shadow mask that is disposed and transmits a converged electron beam, and is attached to a neck portion of the cathode ray tube, and deflects an electron beam emitted from the electron gun in horizontal and vertical directions on the screen. An electron beam deflecting means for performing convergence correction, a deflecting portion for applying a deflection control current and a deflection correction current to the electron beam deflecting means, and a correction waveform for correcting geometric distortion and convergence deviation of a display image on the screen And a correction waveform generation unit for generating a signal to be provided to the deflection unit, and a test signal that is linear on the screen And a test signal generator provided on the surface of the shadow mask facing the electron gun and arranged two-dimensionally so that the interval becomes narrower as the deflection angle of the electron beam increases. A plurality of index phosphors that emit light by the test signal, and a test signal from the test signal generating unit detects the light emission output when the electron beam is emitted from the electron gun and reaches any of the index phosphors, and the index is detected. A photoelectric conversion unit that outputs a signal, and a position detection unit that detects each arrival position of the electron beam on the screen based on the index signal output by the photoelectric conversion unit and gives the arrival position information to the correction waveform creation unit. And are provided.

According to a third aspect of the present invention, a screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen, and an electron which is arranged between the electron gun and the screen and converges A cathode ray tube including a shadow mask that transmits a beam, and an electron that is attached to a neck portion of the cathode ray tube and deflects an electron beam emitted from the electron gun in horizontal and vertical directions on the screen and performs convergence correction. Beam deflecting means, a deflection section for applying a deflection control current and a deflection correction current to the electron beam deflecting means, a correction waveform for correcting geometric distortion and convergence deviation of a display image on the screen, and the deflection. Waveform correction section to be given to the electron gun, and a test for giving a linear test signal to the electron gun on the screen Signal generator and two-dimensionally arrayed on the surface of the shadow mask facing the electron gun so that the interval becomes narrower as the deflection angle of the electron beam increases. The ones arranged above and below have a larger shape than those arranged on most surfaces of the shadow mask, and a plurality of index phosphors that emit light by the arrival of an electron beam, and a test signal of the test signal generator, A plurality of photoelectric conversion units that detect an emission output when an electron beam from the electron gun is emitted and arrive at any of the index phosphors and output an index signal, and an index output by each photoelectric conversion unit. A position detection unit that detects each arrival position of the electron beam on the screen based on the signal and gives the arrival position information to the correction waveform creation unit. , It is characterized in that it comprises a.

According to a fourth aspect of the present invention, a screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen, and an electron arranged between the electron gun and the screen and converged. A cathode ray tube including a shadow mask that transmits a beam, and an electron that is attached to a neck portion of the cathode ray tube and deflects an electron beam emitted from the electron gun in horizontal and vertical directions on the screen and performs convergence correction. Beam deflecting means, a deflection section for applying a deflection control current and a deflection correction current to the electron beam deflecting means, a correction waveform for correcting geometric distortion and convergence deviation of a display image on the screen, and the deflection. Waveform correction section to be given to the electron gun, and a test for giving a linear test signal to the electron gun on the screen Signal generating portion, provided over most of the surface of the shadow mask facing the electron gun, and a plurality of two-dimensionally arranged so that the interval becomes narrower as the deflection angle of the electron beam increases. A first index phosphor that emits light when an electron beam arrives, and a first index phosphor that is provided on a vertical symmetry axis of a surface of the shadow mask that faces the electron gun and that emits light when an electron beam arrives. A second index phosphor having a larger shape and a different central emission wavelength, and a test signal from the test signal generator radiate each electron beam from the electron gun to cause the first index phosphor to emit light. A first photoelectric conversion unit that detects a light emission output when any one of the light sources arrives and outputs a first index signal, and a test signal from the test signal generation unit, A second photoelectric conversion unit that detects a light emission output when each electron beam is emitted from the electron gun and reaches the second index phosphor, and outputs a second index signal, and the first and second photoelectric conversion units. A position detection unit that detects each arrival position of each electron beam on the screen based on the first and second index signals output from the photoelectric conversion unit, and applies the arrival position information to the correction waveform creation unit; Is provided.

According to a sixth aspect of the present invention, a screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen, and an electron arranged between the electron gun and the screen and converged. A cathode ray tube including a shadow mask that transmits a beam, and an electron that is attached to a neck portion of the cathode ray tube and deflects an electron beam emitted from the electron gun in horizontal and vertical directions on the screen and performs convergence correction. Beam deflecting means, a deflection section for applying a deflection control current and a deflection correction current to the electron beam deflecting means, a correction waveform for correcting geometric distortion and convergence deviation of a display image on the screen, and the deflection. Waveform correction section to be given to the electron gun, and a test for giving a linear test signal to the electron gun on the screen Signal generation section and a surface of the shadow mask facing the electron gun are two-dimensionally arranged in plural sets such that the intervals become narrower as the deflection angle of the electron beam increases, and the wavelengths differ depending on the arrival position of the electron beam. Each electron beam is radiated from the electron gun to reach the first phosphor by the index phosphor composed of the first and second phosphors that emit light by the test signal and the test signal from the test signal generator. Each electron beam is emitted from the electron gun by the first photoelectric conversion unit that detects a light emission output at the time and outputs the first index signal, and the test signal of the test signal generation unit, and the second fluorescence is emitted. A second photoelectric conversion unit that detects a light emission output upon reaching the body and outputs a second index signal, and a first and second index signal that are output by the first and second photoelectric conversion units. Hazuki detects the respective arrival positions of the electron beams in the screen,
The arrival position information is given to the correction waveform creating section, and when one of the first and second index signals is not obtained, a signal for horizontally moving the position of the test signal on the screen is used as the test signal. And a position detecting section for giving to the signal generating section.

According to the invention of claim 8 of the present application, a screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen, and an electron which is arranged between the electron gun and the screen and converges. A cathode ray tube including a shadow mask that transmits a beam, and an electron that is attached to a neck portion of the cathode ray tube and deflects an electron beam emitted from the electron gun in horizontal and vertical directions on the screen and performs convergence correction. Beam deflecting means, a deflection section for applying a deflection control current and a deflection correction current to the electron beam deflecting means, a correction waveform for correcting geometric distortion and convergence deviation of a display image on the screen, and the deflection. Waveform correction section to be given to the electron gun, and a test for giving a linear test signal to the electron gun on the screen Signal generator and a surface of the shadow mask that faces the electron gun are two-dimensionally arranged so that the interval becomes narrower as the deflection angle of the electron beam increases, and emits light when the electron beam arrives. An index signal is output by detecting a light emission output when an electron beam is emitted from the electron gun and reaches any one of the index phosphors by a plurality of index phosphors and a test signal of the test signal generator. Based on the index signal output by the photoelectric conversion unit, and the photoelectric conversion unit to detect each arrival position of the electron beam on the screen, the position detection unit for giving the arrival position information to the correction waveform creation unit, the Auxiliary deflection control means for giving a signal for moving the position of the electron beam in the vertical direction and in the horizontal direction by a certain amount to the correction waveform creating section; And a distortion discriminating section for discriminating the geometrical distortion of the electron beam from the output from the auxiliary deflection control means and giving the result to the correction waveform creating section. is there.

Claim 1 of the present application having such characteristics
According to the second aspect of the invention, a plurality of index phosphors are two-dimensionally arranged on the surface of the shadow mask facing the electron gun so that the intervals become narrower as the deflection angle of the electron beam increases. Make it emit light upon arrival. The electron beam deflecting means attached to the neck portion of the cathode ray tube deflects the electron beam emitted from the electron gun horizontally and vertically on the screen. When correcting the geometrical distortion of the cathode ray tube and the deviation of the convergence, first, the test signal generator gives a test signal which is linear on the screen to the electron gun. The photoelectric conversion unit detects the light emission output when the electron beam is emitted and reaches any of the index phosphors by the test signal of the test signal generation unit, and outputs the index signal. The position detection unit detects each arrival position of the electron beam on the screen based on the index signal output from the photoelectric conversion unit, and gives the arrival position information to the correction waveform creation unit. Next, the correction waveform generation unit generates a correction waveform for correcting the geometrical distortion of the display image on the screen and the deviation of the convergence, and gives the correction waveform to the deflection unit. Then, the deflecting unit applies the deflection control current and the deflection correction current to the electron beam deflecting means. By doing so, even if the display screen is close to a flat surface, it is possible to automatically and accurately correct geometrical distortion and convergence.

According to the invention of claim 3 of the present application, in addition to the elements of the invention of the preceding paragraph, the index phosphors arranged above and below the vertical symmetry axis of the shadow mask are arranged on most surfaces of the shadow mask. It has a larger shape than what is used. Therefore, even when the geometrical distortion amount and the convergence deviation amount in the vertical direction are large, the test signal always scans the index phosphor, and a large vertical position deviation amount in the central portion of the screen can be easily detected. .

According to the inventions of claims 4 and 5, in addition to the elements of the invention of claim 3, the first index phosphor is provided over most of the surface of the shadow mask, and
The shape of the second index phosphor is larger than that of the first index phosphor, and the central emission wavelengths are different. This makes it possible to distinguish whether the light emission obtained by the test signal is due to the first or second index phosphor. Therefore, even when the horizontal geometric distortion amount and the convergence deviation amount are large, the output state of the index signal can be easily detected by the combination of the output states of the first and second index phosphors.

According to the inventions of claims 6 and 7, in addition to the elements of the inventions of claims 1 and 2, index phosphors composed of two kinds of phosphors are provided at a plurality of positions over the surface of the shadow mask. To be installed. Then, the central emission wavelength of one phosphor is set to be different from that of the other phosphor. Especially, when one of the first and second index signals cannot be obtained, it is determined that the horizontal shift is large. In this way, the output state of the index signal can be easily detected by the combination of the output states of the two types of phosphors, regardless of where on the screen the geometric distortion amount and the convergence shift in the horizontal direction occur.

According to the eighth and ninth aspects of the present invention, in addition to the elements of the first and second aspects of the invention, an auxiliary deflection control means and a distortion determining section are provided. The auxiliary deflection control means gives a signal for moving the position of the electron beam in the vertical direction or in the horizontal direction by a predetermined amount to the correction waveform creating section. The distortion discriminating section discriminates the geometric distortion of the electron beam from the output from the position detecting section and the output from the auxiliary deflection control means, and gives the result to the correction waveform creating section. By doing this, by determining the state of the index signal when the test signal is moved by a certain amount,
The geometric distortion can be detected with high accuracy, and the geometric distortion and the convergence can be corrected.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cathode ray tube control device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a conceptual diagram showing the operating principle of the cathode ray tube controller of the first embodiment. FIG. 2 is a block diagram showing the structure of the cathode ray tube control device of this embodiment, and FIG. 3 is a block diagram specifically showing the internal configuration of each circuit section. In any of the drawings, the same parts as those in the conventional example are given the same names, and detailed description thereof will be omitted.

As shown in FIG. 1, the cathode ray tube 100 is provided with R,
The G and B color electron guns 1, 2, and 3 are provided, respectively. The shadow mask 4 is a curved mask provided in a portion where the electron beams emitted from the electron guns 1 to 3 converge. Behind the shadow mask 4 is provided a fluorescent screen 5 which is nearly flat. The phosphor screen 5 is a phosphor screen in which R, G, and B phosphors are applied in a matrix form, and constitutes a screen for displaying an image. The index phosphor 6 is a shadow mask 4 for detecting the main scanning position of the electron beam.
Is a detection element applied in a matrix on the entire surface of the electron guns 1 to 3 side. The index phosphor 6 is composed of a linear body oblique to the main scanning direction of the electron beam, and has an inverted V shape here.

Here, as shown in FIG. 1A, the index phosphor 6 is arranged so that the interval between two adjacent patterns becomes narrower as the deflection angle of the electron beam on the shadow mask 4 increases. It is arranged. With such an arrangement, in the cathode ray tube in which the phosphor screen 5 is close to a flat surface and the distance between the shadow mask 4 and the phosphor screen 5 becomes larger toward the peripheral portion of the screen, as shown by the cross mark in FIG. The positions of the electron beams passing through the same positions of the respective index phosphors 6 and projected onto the phosphor screen 5 are uniformly spaced in the horizontal and vertical directions. However, since most of the shadow mask 4 coated with the index phosphor 6 is non-penetrating, the electron beam does not land on the cross mark portion of FIG. 1B.

As shown in FIG. 3, the cathode ray tube controller includes a convergence yoke 101 as an electron beam deflecting means.
And a cathode ray tube 100 to which a deflection yoke 102 is attached. From the input terminal 103 to the signal processing unit 15
The video signal is input to the input terminal, and the synchronization signal is input from the input terminal 104. The deflection unit 14 is a circuit including a geometric distortion screen amplitude correction circuit 19 and a convergence correction circuit 20. The deflection unit 14 generates horizontal and vertical deflection signals and a convergence signal based on a synchronization signal, and also a correction waveform generation unit 13 Is a circuit that superimposes the correction waveform generated by the above and applies a deflection current to the convergence yoke 101 and the deflection yoke 102. That is, the deflection unit 14 creates a correction waveform of geometrical distortion so that the display areas of the respective colors are uniformly positioned over the entire screen, and performs the deflection correction based on the correction data of the screen amplitude. Further, the deflection unit 14 generates a color misregistration correction waveform so that the display areas of the respective colors are located at the same position over the entire screen, and performs the convergence correction.

The signal processor 15 includes a test signal generator, power-amplifies a video signal or a test signal, and outputs the signal to the cathode ray tube 1.
00 is a circuit that gives those signals to the drive electrodes. The detection unit 12 is a circuit that includes a photoelectric conversion element 21, a time / voltage converter 22, and a measurement circuit 23. The index phosphor 6 inputs an index signal emitted by a test signal, and receives signals such as a light reception time and a light reception interval. Is a position detection unit for detecting the geometrical distortion of the cathode ray tube 100 and the deviation of the convergence. The correction waveform creation unit 13 is the detection unit 1.
When the second signal is input, it is a circuit that generates a correction waveform in synchronization with the synchronization signal and outputs the correction waveform to the deflection unit 14.

Regarding the operation of the cathode ray tube control apparatus of the first embodiment thus constructed, the basic operation will be described with reference to FIGS. A synchronizing signal is input to the input terminal 104 of FIG. 3, and the deflection unit 14 creates a correction current for raster scanning the screen. This correction current is supplied to the convergence yoke 101 and the deflection yoke 102 to control the scanning speed. The video signal input from the input terminal 103 is given to the signal processing unit 15, and the signal processing unit 15 receives the cathode ray tube (C
(RT) 100 performs various kinds of signal processing and amplification for driving the cathode electrode.

As shown in FIG. 1, inside the cathode ray tube 100, the plurality of index phosphors 6 arranged by the shadow mask 4 are irradiated with the electron beam whose brightness is modulated by the test signal of the test signal generator. Emits light. This light is used as an index signal (two-dimensional position signal) in FIG.
Is supplied to the photoelectric conversion element 21 and is converted into an electric signal. In this way, the feedback signal from the index phosphor 6 is input to the detector 12, and the light emitting position by the test signal is detected. The correction waveform creation unit 13 creates an optimum correction waveform for correcting geometric distortion and convergence deviation from this detection signal. The correction waveform of the correction waveform creation unit 13 is supplied to the deflection unit 14 and is used to control the scanning of the electron beam.

As described above, the shadow mask 4 is arranged at a predetermined position in the main scanning direction of the electron beam.
An index signal is generated according to the scanning of the electron beam by the index phosphor 6 composed of two oblique linear members. Then, the two-dimensional position of the electron beam can be detected by the detection unit 12, and the electron beam can be deflected by the detection signal of the detection unit 12 to automatically correct geometrical distortion and convergence.

Next, the control method of this embodiment will be described with reference to FIGS.
This will be described in detail with reference to the block diagram of FIG. 4 and the waveform diagram of FIG. FIG. 4 is a block diagram showing a specific configuration of the correction waveform creating unit 13. As shown in the figure, the correction waveform creation unit 13 has a memory 27 that holds correction data. The address of the memory 27 is controlled by the address generation circuit 26 in synchronization with the synchronization signal. The calculation circuit 31 is a circuit that calculates correction data of each correction point based on the detection signal of the detection unit 12, and this correction data is stored in the memory 27.

The correction data mentioned here is data for correcting the amount of positional deviation of each correction point by the detection signal (positional deviation signal). The interpolation circuit 28 is a circuit that interpolates data between correction points using the data of each correction point read from the memory 27. The D / A converter 29 is a circuit that converts the data interpolated by the interpolation circuit 28 into an analog amount. LPF
The (low-pass filter) 30 is a circuit for smoothing the analog amount converted by the D / A converter 29. Thus, FIG.
The positional deviation signal from the measuring circuit 23 of FIG.
3 and various correction waveforms are created.

An enlarged view of the index phosphor 6 is shown in FIG.
(A). Different from the conventional example, the index phosphor 6
Is composed of two diagonal linear members 6c and 6d. R, G,
A test signal is input from the signal processing unit 15 to each electron gun B, and the test signals 24 and 25 are projected on the index phosphor 6. Here, the test signal 25 is a G test signal, and the test signal 24 is an R test signal. Since the B test signal operates in the same manner as the R test signal 24, it is not shown in the drawing and its explanation is omitted. In this case, the photoelectric conversion signal of the test signal 25 is as shown in FIG. 5B, and the photoelectric conversion signal of the test signal 24 is as shown in FIG. 5C. When the electron beam crosses the oblique linear members 6a and 6c in this manner, a pulse is generated at the first rising edge.

The signal photoelectrically converted by the photoelectric conversion element 21 of FIG. 3 is supplied to the time / voltage converter 22 and the two-dimensional position of the signal is extracted. When the two timing pulses shown in FIG. 5B are input by the test signal 25, the time / voltage converter 22 generates the gate pulse shown in FIG. 5D and further generates the ramp signal shown in FIG. To do. Similarly, the time / voltage converter 22 generates the gate pulse shown in (e) when the two timing pulses shown in FIG. 5 (c) are input by the test signal 24, and further the ramp shown in (g). Generate a signal.

The measuring circuit 23 regards the test signal 25 of FIG. 5A as a reference signal and the test signal 24 as a focusing signal, and measures the timing. When the first position measurement such as convergence in the vertical direction is performed, the test signals 25 and 24 are projected, and the left diagonal linear member of the index phosphor 6 is displayed as shown in FIGS. 5B and 5C. Time intervals t1 and t2 required for the electron beam to scan from 6c to the right diagonal linear member 6d are measured.

The measurement method is as shown in FIGS. 5 (d) and 5 (e).
The gate pulse shown in Fig. 5 is created, and from this signal,
The ramp signals shown in (f) and (g) are generated to convert the time interval into voltage information. Therefore, the voltage V1 is detected as the amount indicating the time interval of the vertical reference signal, and the voltage V2 is detected as the amount indicating the time interval of the focusing signal.
The time-voltage converted signal from the time / voltage converter 22 is supplied to the measuring circuit 23, and the deviation amount in each correction direction is measured. Based on this shift amount, the test signal 24 is corrected so as to be in the same vertical position (V1 = V2) as the test signal 25.

The same applies when the second position measurement such as convergence in the horizontal direction is performed. That is, test signal 2
5 and 24 are projected, and the time intervals t3 and t4 from the output of the reference signal and the focusing signal to the emission of the index phosphor 6 are measured as shown in FIGS. As a measuring method, a gate pulse is created based on the timing pulse in the same manner as in FIGS. 5D and 5E, and the ramp signal shown in FIGS. 5J and 5K is generated from the gate pulse. To do. Then, the time intervals of these ramp signals are converted into voltage information. Therefore, the voltage V3 is detected as the amount indicating the time interval of the horizontal reference signal, and the voltage V4 is detected as the amount indicating the time interval of the focusing signal. Time / voltage converter 22
The voltage-converted signal is supplied to the measuring circuit 23, and the deviation amount in each correction direction is measured. Due to this shift amount, the test signal 24 and the test signal 25 are at the same horizontal position (V3 = V
4) Make corrections.

Based on the above positional deviation amount, the correction waveform creating unit 13 in FIGS. 2 and 3 creates a correction waveform for controlling geometric distortion, screen amplitude, convergence and the like. The correction waveform is created by the digital convergence method as in the conventional example.

In this embodiment, as shown in FIG. 5 (a), the correction means for only the representative points has been described, but in order to correct the entire screen, the index phosphors 6 shown in FIG. A dynamic correction waveform can be created by sequentially detecting and performing information. As described above, by arranging a plurality of detecting elements on the surface of the shadow mask so that the interval between two adjacent points becomes narrower as the deflection angle increases, even in a cathode ray tube whose display screen is close to a flat surface. Therefore, it is possible to perform highly accurate correction of geometric distortion and convergence deviation.

A cathode ray tube control apparatus according to the second embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 6 is a block diagram showing the operating principle and structure of the cathode ray tube controller of the second embodiment. In each figure, the same parts as those in the conventional example and the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference from the configuration of the cathode ray tube control device of the first embodiment is that the detection element arranged on the detection surface of the cathode ray tube is
This is because the index fluorescent substance is used at a position where the geometrical distortion amount in the vertical direction and the deviation amount of the convergence are large, and the output is different from that of other detection elements. This allows correction even if the amount of distortion is large.

As shown in FIGS. 6 and 7, the shadow mask 4
Of the index phosphors, the index phosphors 63, which are hatched larger than the other positions, are provided at the center upper and lower ends. Except for this portion, a large number of index phosphors 6 shown in black, which are the same as in the first embodiment, are arranged in a matrix. At this time, as shown in FIG. 7, a phosphor different from the other index phosphors 6 is used for the large index phosphor 63. For example, P47 phosphor is used for the index phosphor 63, and P46 phosphor is used for the other index phosphor 6.

The spectral characteristics of the index phosphor are shown in FIG. Since P47 and P46 have different emission peak wavelengths of output, a photomultiplier tube or the like having the highest sensitivity for each emission peak wavelength is used as a photoelectric conversion element, or a filter having different transmittance depending on the wavelength is used as a photomultiplier tube or the like. Used in combination. With this, two types of index phosphors 6
The output from 3, 6 can be identified.

Now, the photoelectric conversion elements 32 and 33 shown in FIG.
Is a photoelectric conversion unit for performing photoelectric conversion by detecting the index region, and an element having the highest sensitivity to the emission peak wavelengths of the index phosphors 63 and 6 is used. These photoelectric conversion elements 32 and 33 are provided near or inside the cathode ray tube 100. The time / voltage converters 34 and 35 widen the dynamic range based on the size of the index phosphors 63 and 6. The measuring circuit 23 is a circuit that inputs signals from the two time / voltage circuits 34 and 35 to create a positional deviation signal and supplies the positional deviation signal to the correction waveform creating unit 13. The correction waveform of the correction waveform creation unit 13 is output to the deflection unit 14. The test signal generation circuit 36 also generates a test signal according to the size of the index phosphors 63 and 6. Here, the time / voltage converters 34 and 35 and the measurement circuit 23 have a function of a position detection unit that detects the arrival position of the electron beam at the screen by the test signal.

The operation of the cathode ray tube controller of this embodiment will be described in detail with reference to FIG. As described above, in the cathode ray tube, the distance from the center point of deflection to the phosphor screen is
The farther you go, the farther you go. Therefore, the deflection of the electron beam becomes maximum at the four corners of the screen. Therefore, if the geometric distortion is not corrected, the image on the display screen will be as shown in FIG.
As shown in (a) and (b), the scanning lines of the electron beam have a large waist at the central upper and lower ends.

If an index phosphor 6 having the same size is used on the display screen having such a geometrical distortion, the distortion amount in the vertical direction is the highest as shown in FIG. 9 (a). It is possible that the test signal 61 does not pass over the index phosphor 6 at the central vertical edge of the enlarged screen. In this case, the index signal due to the light emission of the index phosphor 6 is not detected, and there is a possibility that an abnormal operation occurs in the correction of geometrical distortion and convergence.

However, in this embodiment, as shown in FIG. 9B, the large index phosphor 63 is provided at the upper and lower ends of the vertical symmetry axis of the screen, so that the geometric distortion amount and the convergence deviation amount are large. However, the amount of distortion can be detected. In this case, if the index phosphor 63 is large, the interval between the adjacent index phosphors 6 becomes narrower, and the trailing edge of the index signal output by the index phosphors 63 is adjacent to the adjacent index phosphors 6.
There is a possibility that the output of the index signal due to will overlap in time. At this time, an erroneous distortion amount may be detected.

Therefore, as shown in FIG. 6, the output of the index phosphor 63 is subjected to different signal processing with respect to the outputs of the other index phosphors 6. As described above, for example, P4 shown in FIG.
7 is used, and the other index phosphor 6 is P46.
Of the phosphor is used. To detect the emission of the fluorescent substance, by using the photoelectric conversion elements 32 and 33 having high sensitivity to the emission peak wavelengths of the two types of fluorescent substances, the output from the adjacent index fluorescent substances 63 and 6 can be obtained. Even if they overlap in time, they can be identified.

The operation of the time / voltage converters 34 and 35 is the same as that of the first embodiment, but the time / voltage converter 34 for processing the output from the index phosphor 63 is
Time to process output from other index phosphors /
The dynamic range of the lamp output is set larger than that of the voltage converter 35. In this way, even if the distortion amount is large, the distortion amount can be detected without the output being saturated.

As described above, the detection element arranged on the surface of the shadow mask of the cathode ray tube is made large at the position where the geometric distortion amount and the convergence deviation amount in the vertical direction are large, and is different from other detection elements. By using different index phosphors to make the outputs different, it is possible to correct even if the vertical distortion amount is large.

Next, a cathode ray tube control apparatus according to the third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a block diagram showing the operating principle and structure of the cathode ray tube controller of the third embodiment. In each figure, the same parts as those in the conventional example and the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference from the first embodiment is that the two oblique linear members of the index phosphor 6 are composed of phosphors having different emission characteristics. As shown in FIGS. 11 and 12, each index phosphor 6 is composed of two slanting linear bodies 6e and 6f. For example, the left diagonal linear member 6e shown in solid black is a P47 phosphor, and the right diagonal linear member 6f shown in hatching is a P46 phosphor. The method of identifying the output from the index phosphor 6 is the same as that in the second embodiment, and therefore the description is omitted here.

Further, in the cathode ray tube control device of this embodiment, the oblique linear members 6 in each index phosphor 6 are used.
The detection signals from e and 6f are used to detect an abnormal operation of distortion correction in the horizontal direction and control the initial setting of a normal operation.

The binarization circuit 37 of FIG.
This is a circuit for converting an analog photoelectric conversion signal from 2, 33 into a binarized digital signal. Output discriminating circuit 38
Is a circuit for determining whether or not an index signal at a predetermined position is detected based on the output from the binarization circuit 37. The circuits other than this perform the same operations as those of the first and second embodiments, and therefore their functional descriptions are omitted. Here, the binarization circuit 37, the output determination circuit 38, the time / voltage converter 22, and the measurement circuit 23 detect the arrival position of the electron beam by the test signal on the screen, and
And one of the second index signals is not obtained, it has a function of a position detection unit that outputs a signal for horizontally shifting the test signal at the screen position.

The operation of the cathode ray tube controller of this embodiment will be described in detail. FIG. 11 is an exploded perspective view of the cathode ray tube viewed from the fluorescent screen 5 toward the shadow mask 4. The electron beams from the electron guns 1, 2, 3 converge on the circular holes (slits) of the shadow mask 4. The index phosphor 6 is applied to the shadow mask 4 in an inverted V shape so as to traverse a part of these many holes.

FIG. 13 shows the pattern of the index phosphor 6 and the output waveforms of the photoelectric conversion elements 32 and 33 according to the light emission thereof. First, consider the case where the test signal 39 of FIG. 13A is displayed. This test signal 39 scans the two diagonal linear bodies 6e and 6f on the left and right of the index phosphor 6. At this time, the photoelectric conversion element 32 detects light emission of the P47 diagonal linear member 6e, and the photoelectric conversion element 33 detects the P46 diagonal linear member 6e.
The light emission of f is detected. Therefore, the photoelectric conversion elements 32, 33
The signal obtained by binarizing the photoelectric conversion signal of 2 by the binarization circuit 37 is
The pulses are as shown in FIGS. 13B and 13C, respectively. When two pulses are output in this way, the output determination circuit 38 does not control the correction waveform generation unit 13. The time interval at which these two pulses are output is given to the time / voltage conversion circuit 22 and converted into a voltage value. Then, this voltage value is given to the measuring circuit 23 to measure the positional deviation of the test signal 39. Then, the measurement result is output to the correction waveform creating unit 13.

Next, consider the case where the test signal 40 shown by the broken line in FIG. At this time, the photoelectric conversion elements 32, 3 do not pass through the left diagonal linear member 6e.
The binarization circuit 37 binarizes the output of No. 3 to obtain the outputs shown in FIGS. 13D and 13E, respectively. That is, the output from the left diagonal linear member 6e is not detected. When such a pulse is input to the output discriminating circuit 38, the output discriminating circuit 38 does not output the left diagonal linear body 6e,
It is determined that the test signal 40 is offset to the right, and the information is output to the corrected waveform forming unit 13. At this time, the correction waveform generation unit 13 moves the display of the test signal 40 to the left and outputs it to the deflection unit 14. In this way, even if the geometric distortion and the convergence correction are abnormally operated in the horizontal direction, the direction of the distortion can be detected and the normal operation can be initialized.

As described above, the two oblique linear members of the detection element arranged on the detection surface of the cathode ray tube are made of different phosphors, and the detection signal corresponding to the detection element at the predetermined position is output. By controlling the deflection means by this signal and controlling the geometrical distortion of the electron beam and the convergence correction operation, automatic correction is enabled even when the horizontal deflection distortion amount is large.

Next, a cathode ray tube control apparatus according to the fourth embodiment of the present invention will be described with reference to FIGS. FIG. 14 is a block diagram showing the operating principle and structure of the cathode ray tube controller of the fourth embodiment. In any of the drawings, the same parts as those in the conventional example and the first to third embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference from the first embodiment is that the position of the test signal is moved by a certain amount and the index signal at that time is compared with the index signal before the movement so that the state of the geometric distortion can be determined. That is the point. In FIG. 14, an A / D converter 41 is a circuit that converts an analog signal from the measurement circuit 23 into a digital signal. The arithmetic circuit 42 is a circuit for performing arithmetic operations such as data comparison and arithmetic operations for obtaining a correction error based on the converted digital signal. The memory 43 is a memory that stores predetermined data of geometric distortion and correction data calculated by the arithmetic circuit 42.

The D / A converter 44 is a converter for converting the digital correction data from the arithmetic circuit 42 into an analog signal, and the output thereof is given to the deflection section 14.
The auxiliary deflection controller 45 is a circuit that controls the correction waveform generator 13 to change the position of the test signal by a certain amount.
The distortion discriminating circuit 46 is a circuit for discriminating the state of geometric distortion based on the output from the auxiliary deflection control unit 45 and the output from the detection unit 12. The time / voltage converter 22 shown in FIG.
The measuring circuit 23 constitutes a position detecting section having the same function as that of the first embodiment.

The operation of the cathode ray tube controller of this embodiment will be described with reference to the index phosphor patterns and test signals shown in FIGS. FIG. 15A shows the test signal 6 on the index phosphor 6 when there is no geometric distortion.
4 and 65 are shown by a solid line and a broken line, respectively. FIG. 16A shows the test signals 66 and 67 on the index phosphor 6 in the case where there is a geometrical distortion by a solid line and a broken line, respectively. In the case of the test signal 64, the index signal input to the photoelectric conversion element 21 is as shown in FIG. In the case of the test signal 66, the index signal input to the photoelectric conversion element 21 is as shown in FIG. In this case, FIG. 15 (b) and FIG. 16 (b) have the same output. Therefore, in this state, even in the state of FIG. 16A, it is determined that there is no geometric distortion as in FIG. 15A. That is, it may be determined that there is no geometric distortion.

In order to detect the geometric distortion as shown in FIG. 16 (a) in this embodiment, first, the auxiliary deflection controller 45 changes the projected positions of the test signals 64 and 66 in the horizontal direction by a certain amount. At this time, the solid line test signals 64 and 66 in FIGS. 15A and 16A are moved to the positions of the test signals 65 and 67 as shown by the broken lines, respectively. Test signal 6
The index signals of 5 and 67 are shown in FIG.
16 (c) and FIG. 16 (c). At this time, comparing the outputs of the test signal before and after the position movement, as shown in FIG.
In (c), the time t required to pass between the two linear bodies is t.
2 does not change, but t2 in FIG. 16 (b) is shown in FIG. 16 (c).
Then it changes to t2 '.

Further, in FIG. 16A, the test signal 6
If 6 is tilted to the lower left, t2 is reduced by moving the test signal 66 to the left, resulting in t2 '.
Therefore, the direction of the inclination can be determined by increasing or decreasing t2. FIG.
The distortion discriminating circuit 46 of No. 4 outputs the increase / decrease amount of t2 to the arithmetic circuit 42. Based on the information on the inclination, the arithmetic circuit 42 performs upward correction at the left adjacent point of the detection point and downward correction at the right adjacent point of the detection point. Thus, FIG.
The geometrical distortion can be corrected at the position 6 (a).

Next, the correction of the absolute position of the deflection will be described with reference to FIG.
7 will be described. In FIG. 17B, t1 indicates the time from the output of the test signal 68 until the left diagonal linear body starts to emit light, and t2 indicates the electron beam from the left diagonal linear body to the right diagonal linear body. Is the time it takes to pass through. First, t1 and t2 when the test signal 68 is at the absolute position as indicated by the predetermined solid line, and t1 when the test signal 68 is horizontally moved from the absolute position by a certain amount as shown by the broken line. Value (denoted as t1 ′ shown in FIG. 17C) is stored in the memory 43.

Next, the test signal 68 is projected and t1, t2
The actual time of is measured and compared with the value stored in memory 43. If the measured values of t1 and t2 are different from the values stored in the memory 43, the correction waveform of the correction waveform creating unit 13 is changed to correct the deviation of the absolute position of the test signal 68 in both the horizontal and vertical directions.

Further, FIG. 18A shows the test signal 69 in which the deflection width of the screen is narrowed and the deflection is shifted upward at the detection position. The values of t1 and t2 at this time are
Despite the geometric distortion occurring as shown in FIG. 18B, the memory 43 as shown in FIG.
Since it becomes equal to t1 and t2 at the time of projection by the test signal 70 stored in the correct absolute position, the distortion amount may not be detected.

As a procedure for correcting the geometrical distortion of the present embodiment, first, the auxiliary deflection controller 45 shown in FIG. 14 controls the correction waveform generator 13 so that the position of the electron beam is constant in the horizontal direction as shown by the broken line. The amount is moved, and t1 at this time is detected. At this time, in the test signal 69 having the geometrical distortion as shown in FIG. 18A, the time for scanning the moved fixed amount becomes long and changes as shown in FIG. 18D. On the other hand, when the test signal 70 having no geometrical distortion is moved by a certain amount in the horizontal direction as shown by the broken line, the detected values of t1 and t2 are as shown in FIG. T obtained at this time
The presence or absence of geometric distortion can be detected by comparing 1 with t1 ′ stored in the memory 43. When the distortion is detected, the arithmetic circuit 42 expands / contracts the raster at the detection position to correct the distortion. The above operation is performed by the memory 43 in t1 and t2.
The geometric distortion of the deflection can be corrected by repeating until it becomes equal to the value of.

As described above, by detecting the change in the timing of the index signal when the test signal is moved by a certain amount in the horizontal direction, it is possible to correct the geometrical distortion such as the inclination or expansion / contraction of the deflection. . Furthermore, after the geometric distortion is corrected, the convergence can be corrected by the same method as in the first embodiment.

In each of the above embodiments, the shadow mask is used as the color selecting section of the cathode ray tube, but it goes without saying that the same effect can be obtained by using other color selecting sections.

[0070]

As described above in detail, according to the inventions of claims 1 to 5 of the present application, even in a cathode ray tube in which the display screen is close to a plane, the geometric distortion of deflection and the convergence can be corrected with high accuracy. Can be realized.

According to the invention of claims 3 to 5 of the present application,
Even if there is a large amount of geometric distortion in the vertical direction in the center of the screen, the test signal scans the index phosphor, so the distortion amount can be easily detected, and the geometric distortion of deflection and convergence can be corrected with high accuracy. .

According to the inventions of claims 6 and 7,
When both the first and second index signals cannot be obtained, it can be determined that the horizontal shift is large. The abnormal operation of the correction system can be automatically detected by controlling the correction waveform creation unit based on the output state of the phosphor at the predetermined position. Further, the geometric distortion of the deflection and the complete non-adjustment of the convergence can be realized.

Further, according to the inventions of claims 8 and 9 of the present application,
By detecting the change in the output timing of the index signal when the test signal is moved by a certain amount in the horizontal direction, it is possible to accurately correct the geometric distortion and convergence such as the inclination and expansion / contraction of the deflection. Effect is large.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a cathode ray tube control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a cathode ray tube control device of the first embodiment.

FIG. 3 is a block diagram showing a detailed configuration of a cathode ray tube control device of the first embodiment.

FIG. 4 is a block diagram of a correction waveform creation unit in the cathode ray tube control device of the first embodiment.

FIG. 5 is a test signal and various signal waveform diagrams showing the operation of the cathode ray tube control apparatus of the first embodiment.

FIG. 6 is a conceptual diagram of a cathode ray tube control device according to a second embodiment of the present invention.

FIG. 7 is a layout view of index phosphors used in the cathode ray tube controller of the second embodiment.

FIG. 8 is a spectral characteristic diagram of the index phosphor of the second embodiment.

FIG. 9 is a screen view showing the operation of the cathode ray tube controller of the second embodiment.

FIG. 10 is a block diagram showing a configuration of a cathode ray tube control device according to a third embodiment of the present invention.

FIG. 11 is a structural diagram of a cathode ray tube according to a third embodiment.

FIG. 12 is a layout view of index phosphors used in the cathode ray tube control apparatus of the third embodiment.

FIG. 13 is a test signal and various signal waveform charts showing the operation of the cathode ray tube controller of the third embodiment.

FIG. 14 is a block diagram showing a configuration of a cathode ray tube control device according to a fourth embodiment of the present invention.

FIG. 15 is a test signal and various signal waveform charts (No. 1) showing the operation of the cathode ray tube controller of the fourth embodiment.

FIG. 16 is a test signal and various signal waveform diagrams (No. 2) showing the operation of the cathode ray tube control apparatus of the fourth embodiment.

FIG. 17 is a test signal and various signal waveform diagrams (No. 3) showing the operation of the cathode ray tube controller of the fourth embodiment.

FIG. 18 is a test signal and various signal waveform diagrams (No. 4) showing the operation of the cathode ray tube control apparatus of the fourth embodiment.

FIG. 19 is a block diagram showing a basic configuration of a conventional cathode ray tube control device.

FIG. 20 is an explanatory diagram showing the operating principle of a conventional cathode ray tube control device.

FIG. 21 is a conceptual diagram of a conventional example for preventing deflection distortion of a cathode ray tube.

FIG. 22 is an explanatory diagram showing a problem (No. 1) in the conventional cathode ray tube control device.

FIG. 23 is an explanatory diagram showing a problem (No. 2) in the conventional cathode ray tube control device.

[Explanation of symbols]

1,2,3 Electron gun 4 Shadow mask 5 Phosphor screen 6,63 Index phosphor 12 Detection part 13 Correction waveform creation part 14 Deflection part 15 Signal processing part 19 Geometric distortion screen amplitude correction circuit 20 Convergence correction circuit 21, 32 , 33 Photoelectric conversion element 22, 34, 35 Time / voltage converter 23 Measuring circuit 24, 25, 39, 40 61, 66, 67, 68, 6
9, 70 Test signal 26 Address generation circuit 27 Memory 28 Interpolation circuit 29 D / A converter 30 LPF (low pass filter) 36 Test signal generation circuit 37 Binarization circuit 38 Output discrimination circuit 41 A / D converter 42 Operation Circuit 43 Memory 44 D / A converter 45 Auxiliary deflection control unit 46 Distortion determination circuit 100 Cathode ray tube 101 Convergence yoke 102 Deflection yoke 103 Input terminal 104 Input terminal

Claims (9)

[Claims] 1. A screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen,
A cathode ray tube including a shadow mask disposed between the electron gun and the screen to transmit a converged electron beam, and an electron beam emitted from the electron gun on the screen, the cathode ray tube being attached to a neck portion of the cathode ray tube. An electron beam deflecting means for horizontally and vertically deflecting and performing convergence correction, a deflecting portion for applying a deflection control current and a deflection correction current to the electron beam deflecting means, and a geometric distortion of a display image on the screen. A correction waveform generation unit that generates a correction waveform that corrects the convergence deviation and applies the correction waveform to the deflection unit; a test signal generation unit that applies a test signal that is linear on the screen to the electron gun; Two-dimensionally arranged on the surface facing the electron gun so that the interval becomes narrower as the deflection angle of the electron beam increases. A plurality of index phosphors arranged in an array and emitting light by the arrival of an electron beam, and a test signal of the test signal generation unit emits an electron beam from the electron gun to arrive at any of the index phosphors. Based on the index signal output by the photoelectric conversion unit that outputs an index signal by detecting the light emission output when the,
A cathode ray tube control device, comprising: a position detection unit that detects each arrival position of an electron beam on the screen and gives the arrival position information to the correction waveform creation unit. 2. The index phosphor is an oblique line phosphor formed in a V shape or an inverted V shape,
The cathode ray tube controller according to claim 1, wherein the axis of symmetry is a vertical deflection direction. 3. A screen on which a phosphor is formed, an electron gun which emits a plurality of electron beams toward the screen,
A cathode ray tube including a shadow mask disposed between the electron gun and the screen to transmit a converged electron beam, and an electron beam emitted from the electron gun on the screen, the cathode ray tube being attached to a neck portion of the cathode ray tube. An electron beam deflecting means for horizontally and vertically deflecting and performing convergence correction, a deflecting portion for applying a deflection control current and a deflection correction current to the electron beam deflecting means, and a geometric distortion of a display image on the screen. A correction waveform generation unit that generates a correction waveform that corrects the convergence deviation and applies the correction waveform to the deflection unit; a test signal generation unit that applies a test signal that is linear on the screen to the electron gun; Two-dimensionally arranged on the surface facing the electron gun so that the interval becomes narrower as the deflection angle of the electron beam increases. A plurality of index fluorescents which are provided in an array and arranged above and below on the vertical symmetry axis of the shadow mask have a larger shape than those arranged on most surfaces of the shadow mask, and emit light when an electron beam arrives. Body and a plurality of photoelectric cells that detect an emission output when an electron beam is emitted from the electron gun and arrive at any of the index phosphors according to a test signal of the test signal generation unit and output an index signal. A conversion unit; and a position detection unit that detects each arrival position of the electron beam on the screen based on the index signal output from each photoelectric conversion unit and gives the arrival position information to the correction waveform creation unit. A cathode ray tube control device characterized by: 4. A screen on which a phosphor is formed, an electron gun which emits a plurality of electron beams toward the screen,
A cathode ray tube including a shadow mask disposed between the electron gun and the screen to transmit a converged electron beam, and an electron beam emitted from the electron gun on the screen, the cathode ray tube being attached to a neck portion of the cathode ray tube. An electron beam deflecting means for horizontally and vertically deflecting and performing convergence correction, a deflecting portion for applying a deflection control current and a deflection correction current to the electron beam deflecting means, and a geometric distortion of a display image on the screen. A correction waveform generation unit that generates a correction waveform that corrects the convergence deviation and applies the correction waveform to the deflection unit; a test signal generation unit that applies a test signal that is linear on the screen to the electron gun; It is provided over most of the surface facing the electron gun, and the space is increased according to the increase of the deflection angle of the electron beam. A plurality of first index phosphors that are arranged two-dimensionally so as to be narrower and emit light when an electron beam arrives; and the first mask is provided on a vertical symmetry axis of a surface of the shadow mask that faces the electron gun. It emits light when the beam arrives,
Has a shape larger than the first index phosphor,
Further, when the second index phosphors having different central emission wavelengths and the test signal of the test signal generating section emit each electron beam from the electron gun and arrive at any of the first index phosphors. A first photoelectric conversion unit that detects a light emission output and outputs a first index signal, and a test signal from the test signal generation unit causes each electron beam to be emitted from the electron gun and the second index phosphor. A second photoelectric conversion unit that detects a light emission output when it arrives and outputs a second index signal; and first and second photoelectric conversion units that output the first and second photoelectric conversion units.
And a position detecting section for detecting each arrival position of each electron beam on the screen based on the index signal of (1) and providing the arrival position information to the correction waveform creating section. . 5. The first and second index phosphors are characterized in that two oblique line-shaped phosphors are formed in a V shape or an inverted V shape, and the symmetry axis thereof is a vertical deflection direction. The cathode ray tube control device according to claim 4. 6. A screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen,
A cathode ray tube including a shadow mask disposed between the electron gun and the screen to transmit a converged electron beam, and an electron beam emitted from the electron gun on the screen, the cathode ray tube being attached to a neck portion of the cathode ray tube. An electron beam deflecting means for horizontally and vertically deflecting and performing convergence correction, a deflecting portion for applying a deflection control current and a deflection correction current to the electron beam deflecting means, and a geometric distortion of a display image on the screen. A correction waveform generation unit that generates a correction waveform that corrects the convergence deviation and applies the correction waveform to the deflection unit; a test signal generation unit that applies a test signal that is linear on the screen to the electron gun; Two-dimensionally arranged on the surface facing the electron gun so that the interval becomes narrower as the deflection angle of the electron beam increases. A plurality of sets of index phosphors, which are composed of first and second phosphors that emit light with different wavelengths depending on the arrival position of the electron beam, and each electron beam from the electron gun according to a test signal of the test signal generator. Of the electron gun by detecting a light emission output when the light is emitted and reaches the first phosphor and outputting a first index signal, and a test signal of the test signal generator. A second photoelectric conversion unit that detects a light emission output when each electron beam is emitted from the second phosphor and reaches the second phosphor, and outputs a second index signal; and the first and second photoelectric conversion units. First and second output of the section
The arrival position of each electron beam on the screen is detected on the basis of the index signal of No. 1, and the arrival position information is given to the correction waveform creating unit, and one of the first and second index signals is obtained. A cathode ray tube control device, comprising: a position detector that gives a signal for horizontally moving the position of the test signal on the screen when the test signal generator is not present. 7. The index fluorescent material according to claim 6, wherein two diagonal linear fluorescent materials are formed in a V shape or an inverted V shape, and the axis of symmetry is a vertical deflection direction. Cathode ray tube control device. 8. A screen on which a phosphor is formed, an electron gun for emitting a plurality of electron beams to the screen,
A cathode ray tube including a shadow mask disposed between the electron gun and the screen to transmit a converged electron beam, and an electron beam emitted from the electron gun on the screen, the cathode ray tube being attached to a neck portion of the cathode ray tube. An electron beam deflecting means for horizontally and vertically deflecting and performing convergence correction, a deflecting portion for applying a deflection control current and a deflection correction current to the electron beam deflecting means, and a geometric distortion of a display image on the screen. A correction waveform generation unit that generates a correction waveform that corrects the convergence deviation and applies the correction waveform to the deflection unit; a test signal generation unit that applies a test signal that is linear on the screen to the electron gun; Two-dimensionally arranged on the surface facing the electron gun so that the interval becomes narrower as the deflection angle of the electron beam increases. A plurality of index phosphors arranged in an array and emitting light by the arrival of an electron beam, and a test signal of the test signal generation unit emits an electron beam from the electron gun to arrive at any of the index phosphors. Based on the index signal output by the photoelectric conversion unit that outputs an index signal by detecting the light emission output when the,
A position detection unit that detects each arrival position of the electron beam on the screen and gives the arrival position information to the correction waveform creation unit, and a signal that moves the position of the electron beam by a certain amount in the vertical direction and the horizontal direction. Auxiliary deflection control means applied to the correction waveform creation section, and geometrical distortion of the electron beam is discriminated by the output from the position detection section and the output from the auxiliary deflection control means, and the result is applied to the correction waveform creation section. A cathode ray tube control device comprising: a distortion determination unit. 9. The index phosphor is a diagonal phosphor formed in a V shape or an inverted V shape,
9. The cathode ray tube controller according to claim 8, wherein the axis of symmetry is the vertical deflection direction.