JP2001352556A - Convergence adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convergence adjustment device that automatically adjusts a convergence offset due to the effect of the geomagnetism so as to eliminate the need for re-adjustment thereby simply realizing manual adjustment to enhance the adjustment accuracy. SOLUTION: The convergence adjustment device is provided with a correction rate control section 8a that outputs a predetermined convergence correction rate 7a depending on an optional geomagnetic vector component, an arithmetic means 8c that calculates convergence adjustment data in an optional installed direction based on the convergence correction rate according to a predetermined calculation expression, a magnetism detection means 3 that detects geomagnetism vector components in three directions orthogonal to each other so as to automatically adjust the convergence, and also with a magnetic field display means 5 that displays the installed direction and the geomagnetism vector components on a screen in terms of vectors, a key control means 4 that enters data for convergence adjustment so as to conduct manual adjustment, and with a degaussing means 6 that automatically conductors degaussing by using a motion detection section 8f for detecting revision of the installed place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence adjusting device for adjusting a convergence deviation due to the influence of terrestrial magnetism in a projection type display device such as a projection type projection or a television receiver. The present invention relates to a convergence adjustment device that enables adjustment.

[0002]

2. Description of the Related Art In recent years, the trend toward high-definition color and large-sized projection display devices has become common, and a plurality of projection tubes are used to project a video signal onto a large screen and superimpose it on a color display. A form for displaying an image is used. When a plurality of projection tubes are used, the video signal projected on the screen may have a deviation, that is, a convergence deviation, due to the mounting position and mounting angle of each projection tube or the influence of a magnetic field from the surroundings such as geomagnetism at the installation site. It is necessary to perform convergence adjustment for correcting the convergence deviation in accordance with the installation direction of the projection display device.

In a conventional projection-type projection system, convergence adjustment signals of various waveforms are generated from signals of horizontal and vertical scanning periods by using an analog circuit, and the signals are skillfully synthesized to form a projection tube. The deviation of the convergence is corrected by applying the voltage to the provided convergence coil.

However, a convergence adjustment device using such an analog circuit not only requires complicated adjustment, but also has a limit in terms of convergence accuracy. Therefore, a convergence adjustment device using a digital circuit has appeared. As a specific example of such a digital convergence adjusting device, there is Japanese Patent Application Laid-Open No. Hei 5-316526 “Convergence Adjusting Device”.

[0005] The convergence adjusting device disclosed in Japanese Patent Application Laid-Open No. Hei 5-316526 has three tubes (red, green,
FIG. 5 shows an example of rear projection of the blue) type.
As shown in FIG. 5, a convergence data memory 60 storing convergence adjustment data adjusted in advance by a plurality of different magnetic fields and a magnetic sensor for detecting the installation direction of the rear projection or a direction setting switch 62 for indicating the installation direction are provided. ing. A convergence control CPU for controlling convergence adjustment when the rear projection, that is, the projection display device is installed
58, according to the installation direction of the rear projection given from the magnetic sensor or the direction setting switch 62,
The convergence adjustment data stored in advance in the convergence data memory 60 is corrected, and the electronic volume value of the matrix circuit 54 is changed based on the corrected convergence adjustment data. The basic waveform signals from the waveform generating circuit 52 are level-controlled and combined in accordance with the electronic volume value of the matrix circuit 54, amplified via the convergence output circuit 56, and then converted to a convergence yoke (not shown) for each projection tube. Is output to

Therefore, the convergence adjustment for each of the plurality of projection tubes is automatically performed based on the convergence adjustment data of a plurality of magnetic fields prepared in advance, so that the deviation of the convergence due to the influence of terrestrial magnetism can be eliminated. Re-adjustment according to the installation direction of the projection display device can be made unnecessary.

[0007]

However, the existing convergence adjusting device has the following two problems, and it is difficult to easily perform the convergence adjustment when actually using the device. . First, as a first problem, when the projection display device is installed in a direction different from the direction of the convergence adjustment data stored in advance, the convergence adjustment data is obtained by interpolating from the stored data. is there. Therefore, in order to increase the accuracy of the convergence adjustment, it is necessary to store more convergence adjustment data in the convergence data memory of the convergence adjustment device in advance. With the presetting of more convergence adjustment data, more manufacturing steps are required for each projection display device during the manufacture of projection display devices such as projection type projectors and television receivers having the convergence adjustment device. This is necessary, resulting in a negative factor in terms of cost and productivity.

The second problem is that, as a basic operation of the conventional invention, the magnetic sensor only detects the installation direction of the projection display device and does not detect the geomagnetic field intensity. However, automatic adjustment of convergence cannot be performed in accordance with the strength of the terrestrial magnetism (ie, the terrestrial magnetism vector component). Further, when there is magnetization in the projection display device, convergence adjustment cannot be performed accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and eliminates the need for presetting a large amount of convergence adjustment data for convergence due to terrestrial magnetism in a convergence data memory or the like during manufacturing. The convergence can be automatically adjusted in accordance with a magnetic field strength level in an arbitrary installation direction and an arbitrary direction of geomagnetism (that is, a geomagnetic vector component; hereinafter, referred to as a geomagnetic vector component). Further, it is an object to provide a means capable of accurately adjusting convergence even when the projection display device is magnetized.

[0010]

The convergence adjusting device according to the present invention comprises the following technical means. A convergence adjustment device constituting a first technical means according to the present invention is a convergence adjustment device for performing convergence adjustment of a projection display device based on convergence adjustment data from the convergence control means. Correction rate control means for outputting a convergence correction rate predetermined according to the terrestrial magnetism vector component for each convergence adjustment point on the display screen of the projection type display device, and the projection type display based on the convergence correction rate. And a calculating means for outputting the convergence adjustment data in an arbitrary installation direction of the apparatus by a predetermined calculation formula.

The convergence adjusting device constituting the second technical means according to the present invention is the convergence adjusting device according to the first technical means, wherein
Key control means for manually inputting magnetic field information relating to an arbitrary installation direction and an arbitrary geomagnetic vector component of the projection display device; and setting the installation direction and the geomagnetic vector component on a screen based on the input geomagnetic field information. And a magnetic field display means for displaying.

A convergence adjusting device constituting a third technical means according to the present invention is the convergence adjusting device according to the first technical means, wherein
As means for detecting the installation direction of the projection display device, there is provided a magnetic detection means for detecting geomagnetic vector components in three directions of X, Y, and Z axes orthogonal to each other. is there.

A convergence adjusting device according to a fourth technical means of the present invention is the convergence adjusting device according to the third technical means,
Magnetic field display means for displaying the installation direction of the projection display device and the geomagnetic vector component on a screen in vector,
Key control means for manually inputting convergence adjustment data.

According to a fifth aspect of the present invention, there is provided a convergence adjusting device according to any one of the second to fourth aspects, wherein the convergence adjustment in the installation direction of the projection display device and the terrestrial magnetic field component is completed. Memory means for storing the convergence adjustment data as adjusted convergence adjustment data, and the installation direction and the geomagnetic vector component stored as the adjusted convergence adjustment data and the current installation direction and the geomagnetic vector component of the projection display device; And comparing and judging means for judging whether or not convergence adjustment is possible using the adjusted convergence adjustment data stored in the memory means.

According to a sixth aspect of the present invention, there is provided a convergence adjusting device according to any one of the first to fifth aspects, further comprising: a degaussing unit for removing magnetization inside the projection display device; And a demagnetizing time limit generating means for operating the demagnetizing means only for a limited time period.

A convergence adjusting device constituting a seventh technical means according to the present invention is the convergence adjusting device according to the sixth technical means,
The apparatus further comprises a movement detecting means for detecting that the installation direction of the projection display device has been moved and for activating the degaussing means.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a convergence adjusting device according to the present invention will be described below with reference to FIGS. First, FIG. 1 is a block diagram showing an example of an embodiment of a convergence adjusting device according to the present invention. As an example of a projection type display device, a case where a three-tube (red R, green G, blue B) type integrated color projection is used is shown. That is, a case is shown in which horizontal and vertical convergence output signals corresponding to the three emission tubes are generated in accordance with the horizontal scanning cycle signal H and the vertical scanning cycle signal V.

In FIG. 1, reference numeral 1 denotes a convergence signal generating means, which has a function of generating a digital signal for convergence adjustment. Convergence signal generating means 1
Is a basic signal generating means 1a for generating a basic digital signal for convergence based on the horizontal scanning period signal H and the vertical scanning period signal V, and the basic digital signal based on a convergence adjustment data signal from the convergence control CPU 8. And convergence signal conversion means 1b for controlling signal generation and converting it into a digital signal for convergence adjustment. An LSI (Large Scale Integrated Circuit) integrating the convergence signal generating means 1 is also provided.
it).

Reference numeral 2 denotes a convergence output means, which is a D / A converter 2 for converting the digital signals for convergence adjustment in the horizontal and vertical directions output from the convergence signal generating means 1 corresponding to each projection tube into analog waveform signals.
a, an operational amplifier 2b for amplifying the converted analog waveform signal, and an output amplifier 2c for generating a signal for driving a convergence yoke of each projection tube.

Numeral 3 is a magnetic detecting means, which is orthogonal to the X, Y and Z axes (the horizontal X and Y axes and the horizontal direction) for automatically detecting the geomagnetic vector component together with the installation direction of the projection display device. It comprises a magnetic sensor 3a for detecting geomagnetic vector components in each of three axes (vertical Z axis) and an A / D converter 3b for converting the three-axis geomagnetic vector component values into digital signals. .

Reference numeral 4 denotes key control means for allowing the operator to input information indicating the installation direction and the geomagnetic vector component of the projection display apparatus or instruction data such as convergence adjustment data. The operator inputs convergence adjustment data from the operator. This is means for making the setting based on the manual operation of. By using the key control means 4, the convergence adjustment data once set can be further finely adjusted manually. Reference numeral 5 denotes an OSD (Optical Symbol Display) display means capable of displaying characters and figures such as characters and symbols, and XY, which is the installation direction of the projection display device, on the east-west north-south (EWSN) coordinate axes. It is used as magnetic field display means for displaying the geomagnetic vector component amounts in the axial direction (horizontal direction) and the Z-axis direction (vertical, that is, in the latitudinal direction) as vectors.

Reference numeral 6 denotes a demagnetizing means, which comprises a demagnetizing circuit 6a for demagnetizing the magnetization inside the projection display device and a demagnetizing time generating circuit 6b for stopping the operation of the demagnetizing circuit 6a after a fixed time. Become. Reference numeral 7 denotes a memory means which stores convergence data such as various programs, basic data, convergence correction rate, and adjusted convergence adjustment data.
ectrically Erasable and Programmable Read-Only Mem
ory) and RAM (Random Access Memory).

The convergence control CPU 8 performs an operation based on the information obtained from the various means described above, outputs data for convergence adjustment to the convergence signal generation means 1 as a convergence adjustment data signal, and performs convergence adjustment. And performs the following operation based on various convergence adjustment programs and data stored in the memory means 7. Correction rate control unit 8a
Determines the convergence correction rate for correcting the convergence adjustment amount based on the data relating to the geomagnetic vector component detected by the magnetism detection means 3 or the data input from the key control means 4 and processed by the manual control unit 8b. Is performed.

The operation unit 8c performs an operation on the basic convergence adjustment data based on the convergence correction rate determined by the correction rate control unit 8a based on the installation direction of the projection display device and the geomagnetic vector component, or Based on the data from the comparison discriminator 8d for comparing the installation direction and the geomagnetic vector component of the adjusted convergence adjustment data stored in the memory means 7 with the current installation direction and the geomagnetic vector component of the projection display device. Then, the final convergence adjustment amount is determined, and the convergence adjustment amount is output to the convergence signal generating means 1 as a convergence adjustment data signal. Further, in order to display the installation direction and the geomagnetic vector component amount on the east-west-north-south coordinates as a vector display image, an OSD data generation unit, that is, a character / graphic generation unit 8e is provided with three axes of X, Y and X axes. The geomagnetic vector component in the direction is transmitted, converted into data, and output and displayed as a vector diagram on the OSD display means as the magnetic field display means 5.

The motion detecting section 8f includes a correction rate control section 8
a from the comparison discriminating unit 8d, which compares the installation direction and the geomagnetic vector component information given from a with the installation direction and the geomagnetic vector component information stored in the memory means 7 as adjusted convergence adjustment data. This is to detect whether or not the installation direction has changed such that the inside of the projection display device needs to be degaussed. If there is such a change, an output signal for degaussing is sent to the degaussing means 6.

The convergence adjusting apparatus according to the present invention differs from the conventional example shown in FIG. 5 in the basic configuration and the method of calculating the convergence adjusting data. That is, as described above, in the conventional example of FIG. 5, with respect to a plurality of convergence adjustment points on the display screen of the projection display device, basic convergence adjustment data for a plurality of installation directions of the projection display device are set. Are prepared in the convergence data memory 60 in advance.
By specifying the direction of the projection type display device actually installed by the magnetic sensor or the direction setting switch 62, the convergence adjustment data in the direction is interpolated from the basic convergence adjustment data relating only to the direction prepared in advance. A plurality of convergence adjustment data are automatically created for each convergence adjustment point (point) on the display screen of the projection display device and for each projection tube.

On the other hand, in the present invention, only one piece of basic convergence adjustment data is prepared in advance, and it is assumed that there is no relation to the installation direction or the direction of terrestrial magnetism (vector component). That is, there is no need to prepare the basic convergence adjustment data in advance as a plurality of data for a plurality of installation directions. Also, the convergence adjustment data required for the direction of the actually installed projection display device is not created based on the convergence adjustment data when installed in another direction, but is actually installed. It is automatically generated based only on the geomagnetic vector component in the direction. Specifically, when calculating the convergence adjustment data, instead of operating the basic convergence adjustment data, the convergence correction data obtained for each convergence adjustment point (point) on the display screen of the projection display device is calculated. It is calculated by adding. Also,
As the convergence correction data, a convergence correction rate 7a (for example, data of about 6 bits) corresponding to a geomagnetic vector component is stored in advance in the memory means 7 for each convergence adjustment point (point), and the convergence correction data is stored in the memory means 7 in advance. The convergence correction rate 7a is obtained from the memory means 7 from the geomagnetic vector component at the installation position,
The automatic calculation is performed according to the following formula (1) defined in the present invention.

That is, for each of a plurality of convergence adjustment points (points) on the display screen, the convergence correction data amount Fx is automatically calculated by the following equation (1) to correct the basic convergence adjustment data. To generate convergence adjustment data necessary for convergence adjustment. Fx = k × F × cos θ + Fs (1) Here, F is the maximum convergence correction data amount determined by the structure of the projection display device, and is a constant value unique to the device. θ indicates the installation angle of the face surface (lens surface) of the display device when the convergence correction does not need to be made at the neutral (middle point) on the display screen. For example, true north (N) It is represented by the rotation angle of the face from the direction. In this case, when the face surface of the lens is at an angle (90 ° or 270 °) perpendicular to the north-south (SN) axis, the convergence correction data amount is adjusted in advance so that it becomes zero. Fs indicates the amount of convergence displacement when the position of the neutral (middle point) on the display screen is shifted on the vertical plane (Z-axis direction). K is
The convergence correction rate, which is a value that is predetermined for each convergence adjustment point (point) based on the three-dimensional magnetic vector component amounts at various points obtained from the magnetic sensors 3a in the orthogonal X, Y, and Z axis directions. .

FIG. 2 shows an example of a convergence error at a neutral (middle point) position on the display screen when the projection display device is rotated 360 ° in the horizontal direction at a certain installation location. The horizontal axis represents the rotation angle on the horizontal plane from the north (N) of the lens surface (face surface) of the display device, that is, the installation angle (installation direction), and the vertical axis represents the convergence error at each rotation position of the display device. That is, it indicates the amount of data required for convergence correction.
FIG. 2 shows the case where the vertical position of the neutral (middle point) position on the display screen is not shifted and the convergence displacement Fs is zero. In FIG. 2, the convergence error is shown in a triangular wave shape, but actually shows characteristics close to a sine wave shape. Therefore, in order to correctly correct such a convergence error corresponding to each rotational position, the convergence correction data amount k is calculated by the above equation (1) instead of using the linear approximation interpolation method. That would be good.

In a projection type display device such as a three-tube large rear projection, it has been conventionally difficult to perform automatic convergence adjustment using a magnetic sensor, because it requires a high level of technology. A major factor requiring advanced technology is that there is no direct causal relationship between the strength of the geomagnetism and the occurrence of convergence errors that occur on the display screen of a large rear projection. For example, even if the electron beam of the red (R) projection tube is given a deviation of several mm due to the magnetization of the convergence yoke, the deviation cannot be detected by a magnetic sensor, and an optical sensor is used. Thus, there is no other way than to detect the shift of the red (R) color on the display screen and automatically adjust the convergence. Alternatively, even if magnetization is generated in any part of the projection display device due to terrestrial magnetism, even if automatic convergence adjustment is performed using only the magnetic sensor, the purpose is maintained unless the magnetization in the device is removed. Can not reach.

In the present invention, geomagnetic vector component information relating to the current installation environment of the projection display device is stored in the memory means 7, and when the power of the projection display device is newly turned on, or When the installation location of the projection type display device is moved, the geomagnetic vector component information stored in the memory means 7 is compared with the geomagnetic vector component information newly obtained from the magnetic sensor 3a to make a comparison. A means is provided for automatically detecting a change in the installation environment of the projection display apparatus, that is, a movement.
When the movement is detected, the degaussing circuit is automatically driven only for a predetermined time period in order to remove the magnetization that may have occurred inside the projection display device. Therefore, it is possible to prevent the occurrence of a convergence error based on a magnetization factor in the projection display device. When the projection display device has a magnetic shield structure, it is not always necessary to perform the degaussing operation.

Next, the detailed operation of the convergence adjusting device according to the present invention will be described with reference to FIGS. First, the degaussing operation of the projection display device will be described. FIG. 3 is a diagram for explaining the timing of the degaussing operation according to the present invention. The degaussing operation will be described with reference to FIG. 3 while referring to the block diagram shown in FIG.
At time T ₁ of the FIG. 3, the power of the projection display device is turned on, the operation of-projecting copy display device is started (rises) when the motion detector 8f shown in FIG. 1 is activated, degaussing The drive signal is output to the demagnetization time generation circuit 6b of the means 6. The by demagnetizing timing generation circuit 6b drives the only degaussing circuit 6a for a predetermined time t ₀ up to the time T _2,
The magnetized state in the projection display device is all demagnetized. That is, the degaussing circuit 6a by suppressing the temperature rise of the PTC thermistor low, to prepare for the driving of the next degaussing operation performs only the degaussing operation during a predetermined time period t _0, automatically stops at time T _2. The motion detecting unit 8f receives the geomagnetic vector components of the X, Y, and Z axes detected by the magnetic detecting unit 3 via the correction rate control unit 8a, and sets the installation direction of the projection display device and the geomagnetic vector. The components are stored in the memory means 7 to prepare for the next movement of the installation environment of the projection display device.

[0033] At time T ₃ shown in FIG. 3, when moving the installation direction of the-projecting copy display device, there may occur the new magnetized inside-projecting copy display device. The comparison and determination unit 8d compares the geomagnetic vector component notified via the correction rate control unit 8a and the installation direction of the projection display device with the geomagnetic vector component and the installation direction stored in the memory unit 7. If it is determined that they do not match, the motion detection unit 8f detects that the projection display apparatus has moved in the installation direction, and drives the degaussing time generation circuit 6b of the degaussing means 6. The by demagnetizing timing generation circuit 6b drives the only degaussing circuit 6a during certain time period t ₁ up to the time T _4, to demagnetize the-projecting shooting type display device.

Next, the operation for automatically generating convergence adjustment data will be described. First, the geomagnetic vector component from the magnetism detecting means 3 shown in FIG. 1 is input to the correction rate control unit 8a. Here, the magnetic detecting means 3
As described above, the magnetic sensor 3a is composed of three magnetic sensors for sensing geomagnetic vector components in three directions of the X axis, the Y axis, and the vertical Z axis, which are orthogonal to the horizontal direction. The direction and intensity of the geomagnetic field are detected as three-dimensional vector components. Data relating to the geomagnetic vector components in the three axial directions detected by the magnetic sensor 3a are stored in A for the purpose of noise suppression and data processing convenience.
The signal is converted into a digital signal by the / D converter 3b and input to the correction rate control unit 8a of the convergence control CPU 8. Next, the correction rate control unit 8a sends the digitally converted geomagnetic vector component to the motion detecting unit 8f for the above-described demagnetizing operation, and simultaneously outputs the geomagnetic vector components in the horizontal X and Y axes and the vertical Z axis. Convergence correction factors 7a (for example, about 15 adjustment points on the entire screen) stored in the memory means 7 in advance on the basis of the terrestrial magnetism vector components. The convergence correction rate k) in the above equation (1) is read and input to the calculation unit 8c.

Next, the calculation unit 8c calculates the X, Y in the horizontal direction.
The installation angle θ of the display device is calculated from the geomagnetic vector component of the axis. Further, the convergence displacement amount Fs associated with the shift amount of the neutral (middle point) position is also obtained using the vertical Z-axis geomagnetic vector component. Further, based on the maximum convergence correction data amount F stored in the memory means 7, the convergence correction data amount Fx at each convergence adjustment point (point) of the projection display device is calculated by the above-described equation (1). . By adding the calculated convergence correction data amount Fx to the basic convergence adjustment data in each projection tube, final convergence adjustment data is obtained. This calculation is repeated for each convergence adjustment point.

The final convergence adjustment data is stored in the memory means 7 and output as a convergence adjustment data signal to the convergence signal generation means 1 to drive the convergence signal conversion means 1b of the convergence signal generation means 1. The convergence signal conversion means 1b converts the basic digital signal from the basic signal generation means 1a with a convergence adjustment data signal to generate a convergence adjustment digital signal. The digital signal for convergence adjustment is output to the convergence output means 2, converted into an analog signal, and amplified to become a convergence adjustment signal, which is a three-tube red (R), green (G), and blue (B) signal. Horizontal and vertical convergence yokes for each projection tube (not shown in FIG. 1)
Is output to

When the projection type display device is installed in an installation location having the same geomagnetic vector component by storing the final convergence adjustment data in the memory means 7, the geomagnetic vector component at the installation location and the projection The comparison direction of the geomagnetic vector component of the adjusted convergence adjustment data stored in the memory means 7 and the installation direction of the projection type display apparatus are compared by the comparison determining section 8d, so that the memory means 7 The stored adjusted convergence adjustment data can be applied, eliminating the need for re-adjustment. Also,
When there are two or more installation locations having the same geomagnetic vector component, if the adjusted convergence adjustment data stored in the memory means 7 is used, readjustment at the time of movement becomes unnecessary, and adjustment can be performed in a short time. It can be performed.

In order to improve the convenience of the adjustment work, the calculation unit 8c is provided with a magnetic field display unit 5 using an OSD (character / graphic) display unit and the installation direction of the projection display device and the geomagnetic vector component. Is transmitted to the character / graphic generation unit 8e. The character / figure generating unit 8e is arranged on a coordinate having horizontal axes of north, south, east and west and a coordinate axis of a vertical latitude (Z axis), and a direction perpendicular to the installation direction (horizontal XY axis direction) of the projection display apparatus. Direction (Z
The graphic data to be displayed as a vector as a geomagnetic vector component (axial direction) is generated, output to the magnetic field display means 5, and displayed as a vector. FIG. 4 shows a display example on the magnetic field display means 5 based on the graphic data. The example illustrated in FIG. 4 illustrates a state in which the installation direction of the projection display device is slightly rotated to the east (E) side from the true north (N) direction, and the horizontal axis in FIG. 2 described above. The display of a above corresponds to a certain position. FIG. 4 shows a solid arrow and a broken arrow on the Z axis, but the actual display indicates that only one of the arrows is displayed according to the vertical geomagnetic vector component. Means.

The operator who performs the convergence adjustment can manually adjust the convergence based on the installation direction of the projection type display device and the geomagnetic vector component amounts which are vector-displayed on the magnetic field display means 5. it can. That is, the operator uses the key control means 4 capable of inputting a remote control (remote control) while referring to the diagram displayed on the magnetic field display means 5,
In order to finely adjust the automatically generated convergence adjustment data, an adjustment point for convergence adjustment, an adjustment data value, and the like are input. In response to the input, the manual control unit 8b in the convergence control CPU 8 converts the data into terrestrial magnetic field component data in three X, Y, and Z axes serving as convergence correction data. To send to. Thereafter, in the case of manual adjustment by the operator, the same realization means as in the case of automatic adjustment, that is, the correction rate control unit 8a, the calculation unit 8c, the comparison determination unit 8d, the character / graphic generation unit 8e, and the motion detection unit The convergence is adjusted using 8f. In the manual adjustment described above, the fine adjustment after the automatic adjustment is described. However, all the convergence adjustment geomagnetic vector component data is input from the key control unit 4 without using the automatic adjustment data. It may be. An arbitrary geomagnetic vector component and an arbitrary installation direction of the projection display device can be directly input from the key control means 4.

As described above, in the case of automatic adjustment, based on the three-dimensional geomagnetic vector component from the magnetic detecting means 3,
In the case of manual adjustment, based on an adjustment instruction from the key control means 4, the correction rate control unit 8a converts the digital data into an appropriate convergence correction rate k (for example, 6-bit digital data for each projection tube). After the conversion, the operation unit 8c calculates final convergence adjustment data. The calculation of the convergence adjustment data is performed by the simple equation (1) as described above even for an arbitrary installation direction of the projection display device and an arbitrary geomagnetic vector component (that is, a continuous change in the omnidirectional magnetic field). Made based on Since the final convergence adjustment data can be obtained only by adding and subtracting the convergence correction data amount Fx calculated by the equation (1) and the basic convergence adjustment data, the convergence adjustment by the installation direction of the display device. Can be performed easily and quickly. According to experiments, it is desirable that the convergence adjustment range be set within a maximum of 5 mm. Further, as described above, the magnetic field display means 5 plays an auxiliary role for further improving the accuracy of the convergence adjustment,
The demagnetizing means 3 plays a role of preventing erroneous adjustment due to magnetization inside the projection display device and supporting reliability of convergence adjustment.

[0041]

According to the present invention, there is provided means for outputting a predetermined convergence correction rate in accordance with an arbitrary geomagnetic vector component, and convergence adjustment data for an arbitrary installation direction of a projection type display device is continuously and accurately obtained. Since it is configured to automatically calculate, it is not necessary to previously set a plurality of magnetic field conditions for each convergence adjustment point, that is, a lot of convergence adjustment data for the geomagnetic vector component. There is no need to make preliminary adjustments to the conditions.

The apparatus is provided with key control means for manually inputting any of the above installation directions and arbitrary geomagnetic vector components, and automatically calculates convergence adjustment data at each convergence adjustment point under the installation conditions. It is not necessary to perform convergence adjustment one by one for each convergence adjustment point, and convergence adjustment can be performed continuously for arbitrary installation conditions and arbitrary geomagnetic vector components.

By providing magnetic detecting means for detecting the geomagnetic vector component and the installation direction of the projection display device,
Convergence adjustment for each convergence adjustment point can be automatically performed.

The convergence can be fine-tuned by providing means for displaying a vector of the geomagnetic vector component and the installation direction of the projection display device on a screen and key control means for manually inputting convergence fine adjustment data. Can be.

By providing the means for storing the adjusted convergence adjustment data, the time for the convergence adjustment can be greatly reduced by using the stored data when the installation conditions are exactly the same.

By providing means for degaussing the inside of the projection display device, a reproducible convergence adjustment result can always be obtained, and the reliability of the convergence adjustment can be ensured.

The provision of the movement detecting section for detecting the movement of the projection display device in the installation direction enables the inside of the projection display device to be automatically demagnetized each time it is moved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an embodiment of a convergence adjusting device according to the present invention.

FIG. 2 is a diagram illustrating an example of a relationship between an installation direction of a projection display device and a convergence error.

FIG. 3 is a diagram for explaining the timing of an automatic degaussing operation according to the present invention.

FIG. 4 is a schematic diagram showing an installation direction and a geomagnetic vector component amount of a projection display device having a convergence adjusting device according to the present invention on a display.

FIG. 5 is a block diagram showing an embodiment of a conventional convergence adjusting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Convergence signal generation means, 1a ... Basic signal generation means, 1b ... Convergence signal conversion means, 2 ... Convergence output means, 2a ... D / A converter, 2b ... Operational amplifier, 2c ... Output amplifier, 3 ... Magnetic detection means 3a
... magnetic sensor, 3b ... A / D converter, 4 ... key control means, 5 ... magnetic field display means, 6 ... degaussing means, 6a
... degaussing circuit, 6b ... degaussing time generation circuit, 7 ... memory means, 8 ... convergence control CPU, 8a ... correction rate control unit, 8b ... manual control unit, 8c ... calculation unit, 8d ... comparison discrimination unit, 8e ... Graphic generation unit, 8f... Motion detection unit.

Claims (7)

[Claims] 1. A convergence adjustment device for performing convergence adjustment of a projection display device based on convergence adjustment data from convergence control means, wherein the convergence control means includes a convergence predetermined in accordance with an arbitrary geomagnetic vector component. Correction rate control means for outputting a correction rate for each convergence adjustment point on the display screen of the projection display apparatus, and based on the convergence correction rate, the convergence adjustment data in an arbitrary installation direction of the projection display apparatus. A convergence adjusting device, comprising: a calculating means for outputting the data according to a predetermined calculating formula. 2. The convergence adjusting device according to claim 1, wherein key control means for manually inputting magnetic field information regarding an arbitrary installation direction and an arbitrary geomagnetic vector component of the projection display device, and the input magnetic field information And a magnetic field display means for displaying the installation direction and the geomagnetic vector component on a screen based on the convergence adjustment device. 3. The convergence adjustment device according to claim 1, wherein the means for detecting the installation direction of the projection display device includes three orthogonal X, Y, and Z axes.
A convergence adjusting device comprising a magnetic detecting means for detecting geomagnetic vector components in two directions. 4. The convergence adjusting device according to claim 3, wherein magnetic field display means for displaying the installation direction of the projection display device and the geomagnetic vector component on a screen in a vector form, and manually inputting convergence adjusting data. A convergence adjusting device comprising key control means. 5. The convergence adjustment device according to claim 2, wherein the convergence adjustment data when the convergence adjustment in the installation direction of the projection display device and the convergence adjustment in the geomagnetic vector component is completed is adjusted. Memory means for storing the data as data, and comparing the installation direction and the geomagnetic vector component stored as the adjusted convergence adjustment data with the current installation direction and the geomagnetic vector component of the projection display device, and storing the data in the memory means. A convergence adjustment device for determining whether or not the convergence adjustment using the adjusted convergence adjustment data has been performed. 6. A convergence adjusting device according to claim 1, wherein said degaussing means removes the magnetization inside said projection display device, and said degaussing means is provided only for a predetermined time period. A convergence adjusting device comprising: a demagnetization time generating means to be activated. 7. The convergence adjusting device according to claim 6, further comprising a movement detecting unit that detects that the installation direction of the projection display device has been moved and activates the degaussing unit. Convergence adjustment device.