JP2002016933A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable reduction of manpower by simplifying user's correcting operation. SOLUTION: A picture display device comprises a directional picture distortion correction mode screen for correcting distortion of the image of a color cathode ray tube 14 by a terrestrial magnetism; a deflection yoke 16 and an RT-Coil 16 for correcting the distortion of the image due to the magnetism; an LCC-Coil 17 and an NS-Coil 18 for correcting landing on the screen of the cathode ray tube; and a CPU 20 for controlling a correction signal to the LCC- Coil 17 and the NS-Coil 18 based on a correction result of the mode image when the mode image is displayed on the tube, and the distortion of the image of the tube 14 due to the magnetism is corrected by operating the yoke 15 and the RT-Coil 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image display device having a cathode ray tube. Specifically, a control unit is provided in the video display device, and the control unit controls a correction signal to the landing correction unit for correcting a landing in the cathode ray tube based on a correction result on the directional image distortion correction mode screen. Thus, the correction operation by the user can be simplified and the labor required can be reduced.

[0002]

2. Description of the Related Art In recent years, a video display device using a cathode ray tube has become widespread. This video display device (for example, a color television receiver or a computer display)
Due to the influence of terrestrial magnetism, directional distortion and mislanding occur in the image displayed on the cathode ray tube. The directional image distortion is a phenomenon in which the trajectory of the electron beam in the cathode ray tube is distorted unnecessarily by geomagnetism, and the displayed image is tilted or displaced up, down, left and right. This is a phenomenon in which the irradiated electron beam shifts.

FIGS. 13A and 13B show examples of images affected by terrestrial magnetism. FIG. 13A is a conceptual diagram in a horizontal magnetic field, and FIG. 13B is a conceptual diagram in a vertical magnetic field. For example, as shown in FIG.
When the surface of the cathode ray tube faces north, an image (indicated by a solid line) tilts counterclockwise with respect to a display surface (indicated by a dotted line) due to a horizontal magnetic field of terrestrial magnetism, and at this time, a landing pattern (indicated by a dashed line) is " Mislanding in a “＼” shape.
In the south direction, the image tilts clockwise, and the landing pattern mislandes in a “/” shape. When the cathode ray tube faces west, the image is displaced upward due to the horizontal magnetic field of the terrestrial magnetism, and at this time, the landing pattern mislandes in an inverted "C" shape. In the east direction, the image is shifted downward, and the landing pattern mislandes in a “C” shape.

Further, for example, as shown in FIG.
In the northern hemisphere, the image is shifted leftward due to the vertical magnetic field of the geomagnetism, and the landing pattern also mislandes leftward. In the southern hemisphere, the image shifts to the right and the landing pattern mislandes to the right. For this reason, a color television receiver (hereinafter, referred to as a color TV receiver) provided with a directional image distortion correction function and a landing correction function to correct these and display a high-quality image has been developed. It is getting.

According to the conventional color TV receiver, the directional image distortion correction and the landing correction can be performed, for example, by applying an appropriate correction current to a correction coil provided at a peripheral portion or a neck portion of a cathode ray tube to obtain a terrestrial magnetism. This is performed by canceling the influence or changing the scanning start position of the electron beam. Such correction includes manual correction and automatic correction.

First, in the manual correction, the color TV
The correction is performed by the user operating the operation buttons (setting button, selection button, and the like) provided on the receiver main body and its remote controller (remote control unit). The user operates the operation buttons to display on the cathode ray tube a setting menu screen for performing initial settings such as a video system, a volume system, and a reception system. On this setting menu screen, “directional image distortion correction” and “landing correction” are displayed.

Then, the user operates the operation button to select and determine "directional image distortion correction" or "landing correction" from the setting menu screen, and displays the directional image distortion correction screen or the landing correction screen. . Thereafter, the user operates the operation buttons while checking the displayed correction screen to perform directional image distortion correction and landing correction.

In automatic correction, for example, a terrestrial magnetism sensor for measuring terrestrial magnetism is provided in the main body of the color TV receiver, and control of a correction coil and the like is automatically performed based on the measurement result of the terrestrial magnetism sensor. ing.

[0009]

However, according to the color television receiver according to the conventional method, the user performs the correction while checking the correction screen in the manual correction, so that the adjustment is finer than in the directional image distortion correction. In addition to the problem that it is not possible to perform accurate correction in the landing correction that requires, the user has to perform not only the directional image distortion correction operation but also the landing correction operation, and There is a problem that it takes.

In addition, the automatic correction cannot accurately measure only the geomagnetism when installed in a magnetic field that is extremely distorted due to external factors (for example, near a high-voltage line or a place surrounded by a reinforcing bar). Causes a problem that appropriate correction control is not performed, so that the user must resort to manual correction in the end, and a problem that a space for arranging the geomagnetic sensor must be secured and the miniaturization of the color television receiver is hindered. .

The present invention has been made in order to solve the above-mentioned problems, and an image display apparatus which simplifies a correction operation by a user without using a geomagnetic sensor or the like and reduces the labor required. The purpose is to provide.

[0012]

SUMMARY OF THE INVENTION The above-mentioned object is to provide a video display apparatus having a cathode ray tube, a directional image distortion correction mode screen for correcting a screen distortion of the cathode ray tube caused by terrestrial magnetism, and a screen distortion caused by terrestrial magnetism. A directional image distortion correction means for correcting the image, a landing correction means for correcting the landing on the cathode ray tube screen, and a directional image distortion correction mode screen is displayed on the cathode ray tube, and the directional image distortion correction means is operated. When distortion of the screen of the cathode ray tube due to terrestrial magnetism is corrected, control means for controlling a correction signal to the landing correction means based on the correction result on the directional image distortion correction mode screen is provided. To be solved.

According to the present invention, the directional image distortion is corrected on the directional image distortion correction mode screen, and based on the correction result, the control signal output to the landing correction means for correcting the landing in the cathode ray tube. Is controlled by the control means, so that the user can also automatically perform the landing correction by performing the directional image distortion correction. Therefore, the manual operation of the landing correction can be omitted without providing a geomagnetic sensor or the like, and the correction operation by the user can be simplified and the labor can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the video display device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a video display device as an embodiment according to the present invention. In this embodiment, a control unit is provided in the video display device, and the control unit outputs a correction signal to the landing correction unit for correcting a landing in the cathode ray tube based on a correction result on the directional image distortion correction mode screen. By controlling, the correction operation by the user is simplified and the labor required for the correction operation is reduced.

The present invention is a color television receiver (hereinafter referred to as a color TV receiver) 100 shown in FIG. 1 which is extremely suitable for application to a video display device for displaying a received video on a cathode ray tube screen. . This color TV receiver 100
Has a receiving unit 11, which is a signal processing unit 12
It is connected to the. In the receiving unit 11, the TV antenna 1
3 and the DVD (Digital Ve
A signal from an externally connected device such as a rsatile disc (player) is input, and a signal of a desired channel is selected and amplified, and supplied to the signal processing unit 12.

The signal processing unit 12 is an integrated circuit including a signal processing circuit and a drive circuit (not shown) and having an I ² CBUS register. The signal processing unit 12 is an I ² CB
Various operations are performed based on the control data written in the US register. The signal processing unit 12 includes a color cathode ray tube 14 for displaying an image, a deflection yoke 15 provided at a neck portion of the color cathode ray tube 14, and a color cathode ray tube 14 for correcting a rotational distortion of the image due to terrestrial magnetism. RT-Coil 16 as a correction coil provided on the neck
Is connected. The signal processing unit 12 reproduces the RGB signals from the Y signal (luminance signal) and the C signal (color signal) and supplies the signals to the color cathode ray tube 14. Color cathode ray tube 1
In 4, the respective electron beams of R, G and B are emitted toward the tube surface.

The signal processor 12 synchronously separates a vertical synchronizing signal and a horizontal synchronizing signal from the Y signal. The signal processing unit 12 generates a vertical deflection current from the vertical synchronization signal and a horizontal deflection current from the horizontal synchronization signal and outputs them to the deflection yoke 15. The deflection yoke 15 deflects the electron beam in the color cathode ray tube 14 based on a vertical deflection current and a horizontal deflection current. The signal processing unit 12 outputs a rotational distortion correction current to the RT-Coil 16. The RT-Coil 16 generates a magnetic field for correcting the rotational distortion of the image displayed on the color cathode ray tube 14 based on the rotational distortion correction current.

Further, the signal processing unit 12 includes a CPU (Central Prism) for controlling the reception unit 11 and the signal processing unit 12.
ocessing Unit) 20 is connected. This CPU2
0 is a ROM (Read Only Memory) 21 and a RAM (Rand
om Access Memory) 22, an operation unit 23, a drive 24, and a nonvolatile memory 25 are connected. An LCC-Coil 17 and an NS-Coil 18 are connected to the drive 24 as correction coils for correcting mislanding.

The arrangement of the LCC-Coil 17 and NS-Coil 18 will be described with reference to FIG. Drive 24 uses LCC-Coil
The landing correction current is output to the 17 and the NS-Coil 18. The LCC-Coil 17 and the NS-Coil 18 generate a magnetic field for correcting mislanding of the image displayed on the color cathode ray tube 14 based on the landing correction current. ROM
21 is a program for the directional image distortion correction mode for manually correcting the directional image distortion in the rotation direction, the vertical direction and the horizontal direction, and automatically corrects mislanding based on the correction result in the directional image distortion correction mode. For example, a program of a landing correction mode for performing the operation is stored.

When the directional image distortion correction mode is executed, a directional image distortion correction mode screen is displayed on the color cathode ray tube 14. The directional image distortion correction mode screen includes a directional image distortion correction menu screen P1 serving as a directional image distortion correction menu screen, and a horizontal magnetic field correction screen P for performing directional image distortion correction in the rotation direction and the vertical direction.
2. A vertical magnetic field correction screen P3 for performing horizontal directional image distortion correction, and a directional image distortion correction menu screen P1
Has a display selection screen P4 for selecting display or non-display. The screens P1 to P4 for correcting the directional image distortion will be described with reference to FIGS.

The operation unit 23 is operated, for example, by operating a menu button 31 for displaying a setting menu screen such as a video system, an audio system, and initial settings, and is operated in an up-down direction for item selection and correction value selection. UP / DOWN button 32,
Enter button 33 for deciding the selected item or correction value
Are arranged. The RAM 22 stores data generated under the control of the CPU 20,
Is used as a working area when executing programs stored in. The non-volatile memory 25 stores the correction value of the directional image distortion set by the operation unit 23 and other various setting states.

The CPU 20 executes the directional image distortion correction mode upon turning on the power supply 30 to the color TV receiver 100 to display the directional image distortion correction menu screen P1 on the color cathode ray tube 14. The CPU 20 changes the vertical deflection current by rewriting the data in the I ² CBUS register of the signal processing unit 12 based on the operation of the UP / DOWN button 32 by the user. Thus, the directional image distortion correction in the vertical direction is performed. The CPU 20 controls the signal processing unit 12 based on the operation of the UP / DOWN button 32 by the user.
To shift the phases of the RGB signal and the horizontal deflection current. Thereby, the directional image distortion correction in the left-right direction is performed. In the CPU 20, the UP / DOWN button 32 by the user
The signal processing unit 12 is controlled based on the above operation to change the rotational distortion correction current. Thereby, the directional image distortion correction in the rotation direction is performed.

Further, the CPU 20 executes a landing correction mode based on the correction result of the directional image distortion. At this time, the CPU 20 determines which direction the color TV receiver 100 faces and how much latitude based on the correction result of the directional image distortion by the UP / DOWN button 32 by the user, that is, the number of steps of the correction operation. , The drive 24 controls the landing correction current output to the LCC-Coil 17 and the NS-Coil 18.

For example, the CPU 20 recognizes that the correction result of the rotation direction is the north direction at the "+5" step and the south direction at the "-5" step. In addition, it is recognized that the correction result in the vertical direction is eastward at the “+3” step and westward at the “−3” step. Further, the correction result in the left and right direction is recognized at around 45 degrees north latitude at the step of "+3" and around 45 degrees south latitude at the step of "-3". Then, the drive 24 is controlled so as to output a landing correction current having a current value and a polarity preset according to the direction and the latitude to the LCC-Coil 17 and the NS-Coil 18.

FIG. 2 is a plan view showing an example of the appearance of the color TV receiver 100. As shown in FIG.
4 is covered with the frame 1 so as to expose the tube surface. Below the front surface of the frame 1, an operation unit 23 covered with an openable lid 2 is arranged. The NS-Coil 18 is disposed so as to surround the periphery of the color cathode ray tube 14.
Therefore, the NS-Coil 18 can correct the mislanding with the same correction amount as a whole for the displayed video.

The LCC-Coil 1 constituting the LCC-Coil 17
Reference numerals 7a to 17d are arranged behind the four corners of the color cathode ray tube 14, and each is controlled independently. Therefore, the LCC-Coils 17a to 17d can correct the mislanding with a partially different correction amount for the displayed image. Here, the operation unit 2
3 is provided on the frame 1, but the present invention is not limited to this. For example, a remote control (remote control unit)
Or the like so that remote control is possible.

FIG. 3 shows a directional image distortion correction menu screen P1.
It is an image figure showing the example of a display of. The directional image distortion correction menu screen P1 shown in FIG.
This is the first screen displayed when the power supply 30 is turned on at 00. The directional image distortion correction menu screen P1 includes “directional correction rotation” for performing directional image distortion correction in the rotation direction, “directional correction vertical” for performing directional image distortion correction in the vertical direction, and horizontal direction. The selection items such as “directional correction left and right” for performing the directional image distortion correction are displayed.

These are selected by the UP / DOWN buttons 32,
It is decided by the decision button 33. In addition, on the directional image distortion correction menu screen P1, a sentence or the like for notifying the user of the directional image distortion correction and a method of selecting and determining a display item is displayed. Also, the numbers displayed to the right of “Direction Correction Rotation”, “Direction Correction Up / Down” and “Direction Correction Left / Right” indicate the current number of correction steps (for example, 0 = initial value or the like).

FIG. 4 is an image diagram showing a display example of the horizontal magnetic field correction screen P2. Horizontal magnetic field correction screen P2 shown in FIG.
"Direction correction rotation" and "Direction correction up / down" are displayed near the center of. The number of correction steps is displayed on the right side of “Direction correction rotation”, and the UP / DOWN buttons 32
Is used to select the number of correction steps, and the determination button 33 is used to determine the number of correction steps. Here, a correction of ± 7 steps is possible.

Similarly, the number of correction steps is displayed on the right side of the "direction correction up / down", the number of correction steps is selected by the UP / DOWN button 32, and the number of correction steps is determined by the determination button 33. It has been made like that. Here, correction of ± 5 steps is possible. In the horizontal magnetic field correction screen P2, mark bars 4 are located near the upper and lower ends.
1, 42 are displayed, and the mark bars 41, 42 are displayed.
It moves in conjunction with the correction operation using the UP / DOWN buttons 32.
In addition, although not shown here, when correcting the directional image distortion in the rotation direction, `` correct the mark bar so that it is horizontal '', or when correcting the directional image distortion in the vertical direction, Please correct so that the interval becomes even. "

FIG. 5 is an image diagram showing a display example of the vertical magnetic field correction screen P3. Vertical magnetic field correction screen P3 shown in FIG.
"Direction correction left and right" is displayed near the center of.
The number of correction steps is displayed on the right side of the "direction correction left and right". The number of correction steps is selected by the UP / DOWN button 32, and the number of correction steps is determined by the determination button 33. . Here, a correction of ± 7 steps is possible.

Mark bars 43, 44 are displayed near the left and right ends in the vertical magnetic field correction screen P3. The mark bars 43, 44 move in conjunction with the correction operation using the UP / DOWN buttons 32. Although not shown here, for example, a notification text such as “Please correct so that the distance between the left and right mark bars and the frame is equal” may be displayed.

FIG. 6 is an image diagram showing a display example of the display selection screen P4. The display selection screen P4 shown in FIG. 6 includes a notification sentence of “Do you want to continue this message?”
"Yes" and "No" selection items are displayed.
When the directional image distortion correction menu screen P1 is displayed even when the power is turned on next time, "Yes" is UP / DOWN.
The selection is made by the button 32 and the determination is made by the determination button 33. If the directional image distortion correction menu screen P1 is not displayed from the next power supply introduction, “No” is selected by the UP / DOWN button 32 and the enter button 33
Is to be determined by. By selecting and determining “No”, non-display data for non-displaying the directional image distortion correction mode screen is stored in the nonvolatile memory 25.

Next, an operation example of the color TV receiver 100 will be described. FIG. 7 is a flowchart showing an operation example (part 1) of the color TV receiver 100, and FIG. 8 is a flowchart showing an operation example (part 2). As shown in FIG. 7, first, in step A1, the CPU 20 causes the color TV receiver 10 to operate.
It waits until the power supply 30 is turned on at 0, and when the power supply 30 is turned on, the process proceeds to step A2. In step A2, the CPU 20 determines whether or not non-display data of the directional image distortion correction mode screen is stored in the non-volatile memory 25.
Is determined by

If the non-display data of the directional image distortion correction mode screen is not stored, the process proceeds to step A3. In step A3, the directional image distortion correction mode is executed, the directional image distortion correction menu screen P1 (see FIG. 3) is displayed on the color cathode ray tube 14 under the control of the CPU 20, and the process proceeds to step A4. In step A4, the user selects the directional image distortion correction menu screen P1
The CPU 2 determines whether or not the UP / DOWN button 32 and the setting button 33 have been operated to select and determine “direction correction rotation”.
If it is determined as “0” and “direction correction rotation” is selected and determined, the process proceeds to step A5.

In step A5, the display is switched from the directional image distortion correction menu screen P1 to the horizontal magnetic field correction screen P2, and the process proceeds to step A6. In step A6,
UP / DOWN by user on horizontal magnetic field correction screen P2
Based on the number of rotation direction distortion correction steps selected by the button 32, the CPU 20 controls the signal processing unit 12 to output an appropriate rotational distortion correction current to the RT-Coil 16. As a result, the directional image distortion in the rotation direction is corrected, and the correction state is corrected by the CPU 20 by the CPU 20 when the determination button 33 is operated by the user.
And the process proceeds to step A7.

In this step A7, the vertical deflection current output to the deflection yoke 15 is determined by the CPU 20 based on the number of vertical correction steps selected by the user operating the UP / DOWN button 32 on the horizontal magnetic field correction screen P2. Controlled. As a result, the directional image distortion in the vertical direction is corrected. When the user operates the enter button 33, the correction state is stored in the nonvolatile memory 25 by the CPU 20, and the process proceeds to step A8.

In step A8, the display is switched from the horizontal magnetic field correction screen P2 to the vertical magnetic field correction screen P3.
Proceed to step A9. In step A9, the user operates the UP / DOWN buttons 32 on the vertical magnetic field correction screen P3 to select the number of horizontal distortion correction steps selected.
The horizontal deflection current output to the deflection yoke 15 is
Is controlled by As a result, the directional image distortion in the left-right direction is corrected, and when the determination button 33 is operated by the user, this correction state is stored in the non-volatile memory 25 by the CPU 20, and the process proceeds to step A10 shown in FIG.

In this step A10, the direction in which the color TV receiver 100 faces and the arranged latitude are recognized by the CPU 20 from the rotational direction, the number of correction steps in the vertical and horizontal directions stored in the nonvolatile memory 25. You. Then, the landing correction mode is executed, and the landing correction current of the current value and the polarity set in advance in accordance with the direction and the latitude is used as the LCC-Coil 17a to 17d.
And the drive 24 outputs CP to the NS-Coil 18
Controlled by U20. As a result, mislanding is corrected, and when the user operates the enter button 33, the correction state is stored in the non-volatile memory 25 by the CPU 20, and the process proceeds to step A11.

In step A11, the display selection screen P
The display is switched to 4, and the process proceeds to step A12. At step A12, the user selects UP on the display selection screen P4.
The CPU determines whether “Yes” or “No” has been selected and operated by operating the DOWN button 32 and the OK button 33
20. If "yes" is selected and determined, the process proceeds to step A13. In step A13, the CP
The non-display data of the directional image distortion correction mode screen is stored in the nonvolatile memory 25 by U20, and the process ends.

Here, in step A2, if the non-display of the directional image distortion correction mode screen is stored in the nonvolatile memory 25, the directional image distortion correction mode is not executed and the process ends. If “No” is selected and determined in step A12, the non-display data of the directional image distortion correction mode screen is not stored in the nonvolatile memory 25, and the process ends.

If it is determined in step A4 that "direction correction rotation" has not been selected, step A14 is executed.
Proceed to. In this step A14, a correction process is performed when the user operates the UP / DOWN button 32 and the setting button 33 on the directional image distortion correction menu screen P1 to select and determine “directional correction up / down” or “directional correction rotation”. The process is performed and the process proceeds to step A10 described above. In addition,
The process in step A14 is a process in which the order of correction has been changed in steps A5 to A9 described above. For example, the processing is such that the directional image distortion is corrected in the order of the vertical direction, the rotation direction, and the horizontal direction, or in the order of the horizontal direction, the rotation direction, and the vertical direction.

Next, an example of correction in the color TV receiver 100 will be described. FIG. 9 shows a color TV receiver 10.
FIG. 10 shows an example of directional image distortion correction of 0 (north direction), and FIG. 10 shows an example of its landing correction (north direction). FIG. Here, it is assumed that the color TV receiver 100 is arranged northward on the equator, and correction is started from directional image distortion in the rotation direction. First, for example, “directional correction rotation” is selected and determined on the directional image distortion correction menu screen P1 (see FIG. 3), and the horizontal magnetic field correction screen P2 is displayed. At this time, as shown in FIG. 9A, the horizontal magnetic field correction screen P2 is rotated counterclockwise under the influence of the horizontal magnetic field of the terrestrial magnetism.

For this purpose, the user operates the UP / DOWN button 32 so that the mark bars 41 and 42 are substantially horizontal. Here, as shown in FIG. 9B, for example, the number of correction steps is “+5” and becomes substantially horizontal. Thus, the directional image distortion in the rotation direction is corrected, and the correction is determined by operating the determination button 33. Thereafter, since no directional image distortion in the vertical direction and directional image distortion in the horizontal direction have occurred, the “directional correction vertical” on the horizontal magnetic field correction screen P2 and the “directional correction vertical” on the vertical magnetic field correction screen P3 (see FIG. 5). The number of correction steps for “direction correction rotation” is determined as “0”. In this way, the user can easily perform the directional image distortion correction manually.

Then, at this time, (“direction correction rotation”,
"Direction correction up / down", "Direction correction left / right") = ("+
From the correction results of “5”, “0”, “0”), the CPU 20 (see FIG. 1) recognizes that the color TV receiver 100 has been arranged, for example, at a latitude of 0 ° and facing north.
As a result, as shown in FIG. 10A, the mislanding landing pattern (indicated by a dashed line) is changed to NS-Coi.
The landing is automatically corrected by l18 as shown in FIG. Thereafter, the display selection screen P4 (FIG. 6)
The user selects and decides “Yes” or “No” in (Ref.).

FIG. 11 shows an example of directional image distortion correction (westward) of the color TV receiver 100, and FIG. 12 shows an example of its landing correction (westward). (A) is before correction, and (b) is after correction. FIG. Here, it is assumed that the color TV receiver 100 is arranged westward on the equator, and correction is started from directional image distortion in the rotation direction. First, for example, “directional correction rotation” is selected and determined on the directional image distortion correction menu screen P1 (see FIG. 3), and the horizontal magnetic field correction screen P2 is displayed. At this time, as shown in FIG. 11A, the horizontal magnetic field correction screen P2 is affected by the horizontal magnetic field of the terrestrial magnetism.
Is displaced upward. Accordingly, since no directional image distortion occurs in the rotation direction, the number of correction steps is determined to be “0” in “direction correction rotation”, and the direction is shifted to “direction correction up / down”.

Next, the user operates the UP / DOWN button 32 so that the distance between the mark bars 41 and 42 and the frame 1 becomes substantially constant in "direction correction up / down". Here, FIG.
As shown in (b), for example, the number of correction steps is “−3”, and the interval is substantially constant. Thereby, the directional image distortion in the vertical direction is corrected, and the correction is determined by operating the determination button 33. Thereafter, since no horizontal directional image distortion has occurred, the number of correction steps of “directional correction rotation” on the vertical magnetic field correction screen P3 (see FIG. 5) is determined to be “0”. In this way, the user can easily perform the directional image distortion correction manually.

Then, at this time, (“direction correction rotation”,
"Direction correction up / down", "Direction correction left / right") = ("0",
Based on the correction result of “−3”, “0”), the CPU 20 (see FIG. 1) causes the color TV receiver 100 to set the latitude 0
At [°], it is recognized that they were arranged westward. As a result, as shown in FIG. 12A, the landing pattern (indicated by a dashed line) resulting from the mislanding is changed to the LCC-Coil 17.
Landing correction is automatically performed by a to 17d as shown in FIG. Thereafter, the display selection screen P4
The user selects and determines “Yes” or “No” (see FIG. 6).

As described above, according to the color TV receiver 100 of the embodiment, the LCC-Coil 17 for correcting mislanding in the color cathode ray tube 14 is used.
a to 17d and a CPU 20 for controlling the NS-Coil 18 are provided, and based on the correction result manually corrected by the user on the screen of the directional image distortion correction mode, the driver 24
Since the landing correction current output to the 7a to 17d and the NS-Coil 18 is controlled by the CPU 20, the user can also perform the directional image distortion correction to automatically perform the landing correction. Therefore, the correction operation by the user can be simplified and the labor can be reduced.

[0050]

As described above, according to the present invention,
In a video display apparatus having a directional image distortion correction mode, a control means is provided, and the control means corrects a landing in a cathode ray tube based on a correction result on a directional image distortion correction mode screen. In this case, the correction signal to the controller is controlled. With this configuration, it is possible to automatically perform the landing correction by performing the directional image distortion correction.

Accordingly, the manual operation of the landing correction can be omitted without providing a geomagnetic sensor or the like, and the correction operation by the user can be simplified and the labor required can be reduced.

The present invention is extremely suitable for application to a video display device such as a high-quality color television receiver using a cathode ray tube and having a narrow pitch between phosphors.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a color TV receiver 100 as an embodiment according to the present invention.

FIG. 2 is a front view showing an example of the appearance of the color TV receiver 100.

FIG. 3 is an image diagram showing a display example of a directional image distortion correction menu screen P1.

FIG. 4 is an image diagram showing a display example of a horizontal magnetic field correction screen P2.

FIG. 5 is an image diagram showing a display example of a vertical magnetic field correction screen P3.

FIG. 6 is an image diagram showing a display example of a display selection screen P4.

FIG. 7 is a flowchart showing an operation example (part 1) of the color TV receiver 100;

FIG. 8 is a flowchart showing an operation example (part 2) of the color TV receiver 100.

9A and 9B show an example of directional image distortion correction (north direction) of the color TV receiver 100, wherein FIG. 9A is an image diagram before correction and FIG. 9B is an image diagram after correction.

10A and 10B show an example of landing correction (north direction) of the color TV receiver 100, where FIG. 10A is an image diagram before correction and FIG. 10B is an image diagram after correction.

11A and 11B show an example of directional image distortion correction (westward) of the color TV receiver 100, wherein FIG. 11A is an image diagram before correction, and FIG.

12A and 12B show examples of landing correction (westward) of the color TV receiver 100, wherein FIG. 12A is an image diagram before correction, and FIG.

FIG. 13 shows an example of an image affected by terrestrial magnetism;
3A is a conceptual diagram in a horizontal magnetic field, and FIG. 3B is a conceptual diagram in a vertical magnetic field.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 11 ... Receiving part, 12 ... Signal processing part, 13 ... TV antenna, 14 ... Color cathode ray tube, 15 ... Deflection yoke, 16 ... RT-Coi
l, 17a-17d ・ ・ ・ LCC-Coil 、 18 ・ ・ ・ NS-Coi
l, 20 ... CPU, 21 ... ROM, 22 ...
RAM, 23 operating unit, 25 nonvolatile memory, 31 menu button, 32 UP / DOWN button, 33 enter button, 30 power supply, 100
... Color TV receivers

Claims (1)

[Claims] 1. An image display apparatus having a cathode ray tube, comprising: a directional image distortion correction mode screen for correcting a screen distortion of the cathode ray tube due to terrestrial magnetism; and a directional image distortion correcting a screen distortion due to terrestrial magnetism. Correction means, landing correction means for correcting the landing on the cathode ray tube screen, the directional image distortion correction mode screen is displayed on the cathode ray tube, and by operating the directional image distortion correction means, a cathode ray by geomagnetism If the tube screen is corrected for distortion,
A video display device comprising: control means for controlling a correction signal to the landing correction means based on a correction result on the directional image distortion correction mode screen.