JPS63272294A - Method and apparatus for adjusting convergence - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of convergence by using an address signal so as to extract an output signal digital convergence signal of a video camera being the result of picking up a display picture for convergence error detection pattern corresponding to a camera position adjustment pattern in a picture display device. CONSTITUTION:A video signal being the result of picking up a green convergence error detection pattern projected at first onto the screen by using a video camera is processed by a video signal processing circuit 12 in the convergence error detection mode. On the other hand, a central arithmetic circuit 17 stores a digital signal outputted from an analog/digital conversion circuit 13 in response to the address signal outputted from an address signal generating circuit 15 as the G data in a 1st area in the frame memory 16. Moreover, the similar processing is executed also to the video signal being the result of picking up the red convergence error detection pattern by using a video camera and the result is stored as an R data in the 2nd area of the frame memory 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to convergence adjustment of an image display device, and more particularly to a convergence adjustment method and device for adjusting convergence using a video signal obtained by photographing a display screen. It is something.

[Prior Art] In recent years, in image display devices that display received television images, video playback screens, etc., the size of the display screen has been increased in order to improve the impact and the visibility of the scene. For example, in a video projector device that enlarges and projects a video screen onto a screen, cathode ray tubes are provided for red, blue, and green images, and the display screen of each cathode ray tube is enlarged and projected onto the screen, and the three images are displayed on the screen. A large color screen is obtained by combining primary color images. Here, it is important to match the convergence of each cathode ray tube over the entire area of the display screen, and if the convergence deviates, color shift will occur on the display screen, degrading the image quality.

For example, when adjusting convergence in a video projector device, the display screen is wide, so there are an extremely large number of correction points, making it extremely difficult to visually detect deviations and manually correct the deviations. It becomes.

To solve this problem, for example, a video camera is used to image the display screen that is enlarged and projected on the screen, and the color shift area is determined from the video camera output, and the convergence adjustment is made for this color shift area. A method of doing this is used. Another method is to image an X-Y matrix-shaped camera position adjustment pattern displayed on a video projector device using a video camera, and change the camera position to match the video output setting position. A method of making adjustments is used.

[Problems to be solved by the invention] In the conventional convergence adjustment method described above,
In order to match the adjustment point captured by the video camera with the convergence correction point, the positional relationship between the video camera and the screen must be maintained with high precision. However, since the convergence adjustment of a video projector device is performed at the installation site, it is necessary to install a video camera each time, and as a result, it takes a lot of time to adjust the position of the video camera. is required.

Furthermore, the method of changing the camera position has problems such as the need for a highly accurate drive mechanism to move the camera position.

The present invention has been made to solve the above-mentioned problems, and allows for easy convergence adjustment without maintaining the positional relationship between the video camera and the screen with high precision or without using a camera position movement mechanism. It is an object of the present invention to provide a convergence adjustment method and device that can perform the convergence adjustment automatically.

[Means for solving problems]

The convergence adjustment method and device according to the present invention include:
From a signal captured by a video camera of an X-Y matrix camera position adjustment pattern displayed by a reference cathode ray tube, an address signal is generated for capturing only the displayed portion of this camera position H3Jl adjustment pattern, and Each adjustment area divided by the camera position adjustment pattern is determined and set as an adjustment area.1. A digital conversion signal of the output signal of the video camera that has captured the display image of the convergence error detection pattern corresponding to the camera position adjustment pattern that is sequentially displayed individually by each cathode ray tube is captured by the address signal, The difference between the measurement tube and the base tube is supplied as a convergence correction signal to the digital convergence section in the display device.

[Effect]

Therefore, in the convergence adjustment method and device configured as described above, by setting the address signal, it is possible to match the deviation between the adjustment point and the convergence correction point by acting in the same manner as moving the camera. This allows highly accurate convergence adjustment to be performed easily and efficiently. Furthermore, since the video camera can be attached to the screen simply by setting the entire screen as its photographing range, the attachment of the video camera becomes extremely easy. Furthermore, since a mechanism for moving the video camera is no longer necessary, the configuration can also be simplified.

[Embodiments of the invention]

FIG. 1 is a block diagram showing the overall configuration for explaining an embodiment of the convergence adjustment method and apparatus according to the present invention. In the figure, reference numeral 1 denotes a video projector device as an image display device for convergence adjustment, which is generally well-known and consists of a projector part 2 and a digital convergence part 3.

Here, the projector part 2 displays images corresponding to R, G, and B color signals of a video signal supplied from the outside on independent cathode ray tubes, and projects each display screen onto a screen (not shown) to synthesize the images. By doing so, a color screen is displayed. Further, the digital convergence unit 3 corrects the convergence of a designated portion of each cathode ray tube provided in the projector portion 2 in accordance with a convergence adjustment signal supplied from the outside. 4 is a video camera that captures an image projected onto a screen (not shown) by the video projector device 1 and outputs a video signal thereof. Reference numeral 5 denotes a convergence adjustment device, which is composed of a signal generator 6 and a convergence error detector 7.

The signal generator 6 then generates a camera position adjustment pattern signal for displaying an X-Y matrix camera position adjustment pattern 9 on the screen 6 as shown in FIG. 2, and a camera position adjustment pattern signal as shown in FIG. A convergence error detection pattern signal for displaying, for example, a circular convergence error detection pattern 11 at the center of each adjustment area 10 in the camera position adjustment pattern 9 is generated and supplied to the projector part 2. . Further, the convergence error detection 7 generates a switching signal that instructs the signal generation section 6 to switch between various display patterns. Furthermore, the convergence error detection section 7 detects the video camera 4.
The convergence error detection pattern 11 using the reference cathode ray tube receives the video signal output from the reference cathode ray tube as input.
The amount of convergence deviation (including direction) in each adjustment area 8 of each camera position adjustment pattern 10 is detected in relation to the display position of the convergence error detection pattern 11 by another cathode ray tube, and this deviation is detected. A convergence adjustment signal corresponding to the amount is generated and supplied to the digital convergence section 3.

In the apparatus configured as described above, convergence adjustment for the video projector apparatus 1 as an image display apparatus is performed as follows. First, the signal generating section 6 provided in the convergence adjustment device 1 sequentially reads data of a camera position adjustment pattern stored in, for example, an internal memory, and transmits this signal to a video projector as, for example, a green signal handled by a reference cathode ray tube. - feed the video signal input terminal of device 1; In the video projector device 1, the projector part 2 takes in the pattern signal for camera position adjustment supplied to the video signal input terminal, so that the X-Y
A matrix-shaped camera position adjustment pattern 9 is projected and displayed on a screen 8 by a cathode ray tube serving as a reference tube and serving as a recording screen.

On the other hand, the video camera 4 photographs the entire surface of the screen 8 and supplies the video signal to the convergence error detection section 7 in the convergence adjustment device 5. The convergence error detection unit 7 generates an X-Y address signal based on the camera position adjustment pattern 9 from the video signal, and based on this X-Y address signal, the video signal supplied from the video camera 4 is stored in the frame memory. Make preparations for storing the signal. Therefore, the convergence error detection unit 7 determines the mounting position of the video camera 4 by setting the address based on the camera position adjustment pattern 9 projected on the screen 8, regardless of the position of the video camera 4 and the screen 8. This means that accuracy is not an issue.

In this way, when the preparation for storing the video signal is completed, the convergence error detection section 7 switches from the camera position adjustment mode to the convergence error detection mode, and generates a switching signal and supplies it to the signal generation section 6. When the signal generating section 6 receives the switching signal, it supplies a convergence error detection pattern signal only to the reference tube in the projector section 2, for example, a cathode ray tube in charge of green. Then, the third screen appears on screen 8.
Many convergence error detection patterns 1 shown in the figure
1 will be displayed in green.

Here, each convergence error detection pattern 11 corresponds to each adjustment area 10 in the camera position adjustment pattern 9.
Therefore, one convergence error detection pattern 11 is located within each adjustment region 10. The image projected and displayed on the screen by this reference tube is photographed by the video camera 4, and its video output signal is supplied to the convergence error detection section 7. The convergence error detection unit 7 detects the video signal supplied from the video camera 4 in accordance with the address signal set based on the camera position adjustment pattern 9 projected on the screen 8 in the video camera position detection mode. G to the first area in the frame memory
Store as data. Therefore, the reference pattern data is stored in the first area of the frame memory with the camera position adjustment pattern 9 as the reference.

Next, the signal generator 6 supplies the convergence error detection pattern signal only to the measurement tube, for example, a cathode ray tube in charge of red. Then, the third screen appears on screen 8.
Many convergence error detection patterns 1 shown in the figure
1 will be displayed in red. The image projected and displayed on the screen by this measurement tube is photographed by the video camera 4, and the video output signal is supplied to the convergence error detection section 7. In the convergence error detection section 7, in the video camera position detection mode described above, the video signal supplied from the video camera 4 is converted into a frame by the address signal generated based on the camera position adjustment pattern 9 projected on the screen 8. It is stored as R data in a second area in the memory.

Here, the convergence error detection unit 7 compares the G data stored as a reference value in the first area in the frame memory with the R data stored in the second area, thereby detecting each adjustment area 10. The amount and direction of convergence deviation of the measuring tube responsible for red color with respect to the reference tube responsible for green color are calculated for each time, and from these values, a convergence error signal for the CRT tube responsible for red color is generated and stored in the internal memory. Store temporarily.

Next, the signal generator 6 supplies the convergence error detection pattern signal only to the measurement tube, for example, a cathode ray tube in charge of blue. Then, the third screen appears on screen 8.
Many conherence error detection patterns 1 shown in the figure
1 will be displayed in blue. The image projected and displayed on the screen by this measurement tube is photographed by the video camera 4, and the video output signal is supplied to the convergence error detection section 7. In the convergence error detection section 7, in the video camera position detection mode described above, the video signal supplied from the video camera 4 is converted into a frame by the address signal generated based on the camera position adjustment pattern 9 projected on the screen 8. It is stored as B data in the third area of the memory.

Here, the convergence error detection unit 7 compares the G data stored as a reference value in the first area in the frame memory with the B data stored in the third area, thereby detecting the difference in each adjustment area 10. The amount and direction of convergence deviation of the measurement tube responsible for blue color with respect to the reference tube responsible for green color are calculated at each time, and from these values, a convergence error signal for the CRT tube responsible for blue color is generated and temporarily stored in internal memory. Store in.

In this way, when the detection of the convergence deviation amount of each measurement tube with respect to the reference tube is completed, the convergence error detection unit 7 detects the convergence error for the cathode ray tube responsible for the red color as the convergence error detection result stored in its internal memory. The signal and the B tube convergence error signal are read out and supplied as a convergence correction signal to the digital convergence section 3 of the video projector device 1. When the digital convergence unit 3 receives the convergence correction signal, it performs convergence adjustment for each of the adjustment areas 10 in the cathode ray tube responsible for red and the cathode ray tube responsible for blue according to the value, and adjusts the convergence for each of the adjustment areas 10 on the screen 8.
To reproduce a high-quality color image in which the three primary color images match over the entire area.

That is, in this case, the address signal generation and convergence error detection pattern 1 are performed based on the camera position adjustment pattern 9 projected on the screen 8.
1 is projected, and the video signal obtained by photographing the projected screen of the convergence error detection pattern 11 is read using the address signal, so the relationship between the video camera 4 and the screen 8 is eliminated. As a result, the video camera 4 only needs to have a field of view of the entire area of the screen 8, so that the accuracy of its mounting position is no longer a problem.

FIG. 4 is a block diagram showing a specific example of the convergence error detection section 7 in the convergence adjustment device 5 shown in FIG. 1. In the figure, I2 is a video signal processing unit that processes a video signal supplied from the video camera 4;
13 is an analog-to-digital conversion circuit that converts the video signal supplied from the video signal processing unit 12 into a digital signal and supplies it to the data bus DB; 14 is a synchronization separation circuit that converts a horizontal synchronization signal included in the video signal; HD and vertical synchronization signal VD are separated and output. Reference numeral 15 denotes an address signal generation circuit, which inputs the horizontal synchronization signal 110 and vertical synchronization signal VD supplied from the synchronization separation circuit 14, thereby generating the above-described camera position adjustment pattern 9.
generates an X address and an X address based on supply the signal. 16 is a frame memory, 17 is a central processing unit, 18 is a read-only memory in which the processing program of the central processing unit 17 is stored, 19 is a random access memory in which calculation processing results are temporarily stored, and 20 is an input/output unit. These frame memories 16. Central processing unit 17. Read only memory 1
random access memory 19 and input/output circuit 20
are connected to data bus DB and address bus AB, respectively.

In the convergence error detection section 7 configured as described above, the video signal obtained by photographing the camera position adjustment pattern 9 supplied from the video camera 4 in the camera position adjustment mode is processed by the video signal processing circuit 12 as a synchronization signal and an image. Signal processing such as separating signal parts is performed. The separated video signal is then converted into a digital signal in the analog-to-digital conversion circuit 13 in synchronization with the timing signal supplied from the address signal generation circuit 15.
This converted digital signal is supplied to the central processing circuit 17 via the data bus DB. In the central processing circuit 17, by executing the processing program stored in the read-only memory 1, 1, the start and end positions of the camera position adjustment pattern signal in the horizontal and vertical deflection directions are determined, and an address signal is generated. The signal is supplied to the circuit 15 and stored.

On the other hand, the synchronization signal separated in the video signal processing circuit 12 is converted into a horizontal synchronization signal 110 in the synchronization separation circuit 14.
and a vertical synchronizing signal VD, which are then supplied to the address signal generation circuit 15. The address signal generation circuit 15 inputs the horizontal synchronization signal 10 and the vertical synchronization signal VD to start and end the camera position adjustment pattern signal supplied from the central processing circuit 17 in the horizontal and vertical deflection directions. An X-Y address is generated based on the value indicating the position, that is, based on the camera position adjustment pattern included in the video signal output from the video camera 4, and after being synthesized, it is sent to the address bus AD as an address signal. Supplied.

Next, in the convergence error detection mode, first, a video signal obtained by photographing a green convergence error detection pattern 11 projected on the screen 8 by a cathode ray tube serving as a reference tube, which is in charge of green color, is sent to the video signal processing circuit 12 by the video camera 4. Processed by The video signal output from the video signal processing circuit 12 is converted into a digital signal by an analog-to-digital conversion circuit 13 and then supplied to the data bus DB. On the other hand, the central processing circuit 17 stores the digital signal outputted from the analog-to-digital conversion circuit 13 in the first area of the frame memory 16 according to the address signal outputted from the address signal generation circuit 15. Store as . Further, similar processing is performed on a video signal obtained by photographing the red convergence error detection pattern 11 projected by the cathode ray tube serving as the measurement tube, which is responsible for the red color, using the video camera 4.
The digital signal obtained by this is sent to the central processing circuit 17.
According to the instruction, the data is stored as R data in the second area of the frame memory 16 in accordance with the address signal output from the address signal generation circuit 15. G in the first area and second area in the frame memory 16.
When the data and R data are stored, the central processing circuit 17 reads out and compares both stored data (G data and R data), and the data is projected onto the screen 8 by the cathode ray tube responsible for the green color in each adjustment area 10. The amount of deviation of the image projected by the cathode ray tube responsible for the red color with respect to the red image is detected, and this amount of deviation is temporarily stored in the random access memory 19.

Next, similar processing is performed on the video signal obtained by photographing the blue convergence error detection pattern 11 projected by the cathode ray tube serving as the measurement tube, which is in charge of blue color, using the video camera 4, and the resulting digital The signal is stored as B data in the third area of the frame memory 16 in accordance with the address signal output from the address signal generation circuit 15 under instructions from the central processing circuit 17 . The third frame memory 16
When the B data is stored in the area, the central processing circuit 17
reads the G data and B data and compares them, thereby detecting the amount of deviation of the image projected by the cathode ray tube in charge of blue with respect to the image projected on the screen 8 by the cathode ray tube in charge of green in each adjustment area 10. , this amount of deviation is temporarily stored in the random access memory 19.

In this way, the convergence error detection pattern projected by the cathode ray tube serving as the reference tube, which is in charge of green color, and the convergence error detection pattern projected by the cathode ray tube, which is responsible for red and blue color, as measurement tubes, are detected. Then, the central processing circuit 1
7 reads the shifted star temporarily stored in the random access memory 19 and supplies it to the digital convergence unit 3 shown in FIG. 1 as a convergence correction signal.

FIG. 5 is a circuit diagram showing a specific example of the address signal generation circuit 15 shown in FIG. 4. Sample clock generation circuit 2
1 receives the horizontal synchronization signal HD supplied from the synchronization separation circuit 14 shown in FIG. . The horizontal address counter 22 is a horizontal address counter controller 2
The X address is generated by counting the sampling clocks only during the supply period of the horizontal control signal SX supplied from No. 3. The vertical address counter 24 receives the horizontal synchronization signal HD only during the supply period of the vertical control signal SY supplied from the vertical address counter control section 25.
The Y address is generated by counting the .

On the other hand, the vertical synchronization signal VD supplied from the synchronization separation circuit I4 shown in FIG. be done. Further, this vertical synchronization signal VD is counted by the counter 27, and the counted value is determined by the frame number setting section 28.
A match signal is generated from the comparator 29 when the value matches a preset value. The coincidence signal generated from this comparator 29 and the vertical synchronization circuit 2
By determining the coincidence of 6 in the AND gate 30, control is performed to increase the S/N by repeating the capture of the same data between a plurality of frames.

On the other hand, in the vertical address counter system Jl11 section 25, the vertical counter 25a counts the horizontal synchronizing signal HD while being reset by the output signal of the AND gate 30. Also, the vertical capture start address setting section 25b
The vertical capture end address setting unit 25c is set to the vertical deflection address where the start position and end position in the vertical direction of the camera position adjustment pattern determined in the camera position adjustment mode are determined by the central calculation control unit 17 as shown in FIG. is set as . Therefore, when the count value of the vertical counter 25a exceeds the output value of the vertical capture start address setting section 25b, the output of the comparator 25d changes from "L" to rH.
, is reversed. On the other hand, since the output of the comparator 25e normally indicates the rH state, the output of the AND gate 25f is inverted to rH, allowing the vertical address counter 24 to perform a counting operation. Therefore, this vertical address counter 24 starts counting the horizontal synchronizing signal HD from the vertical capture start portion, that is, from the vertical start position of the camera position adjustment pattern, and uses this counted value as the Y address. Output. and,
When the count value of the vertical counter 25a exceeds the output value of the vertical capture end address setting section 25C indicating the end position of the camera position adjustment pattern in the vertical direction, the comparator 25
The output of e is inverted from "H" to "L". As a result, the output of the AND gate 25f is inverted to "L" and the counting operation of the vertical address counter 24 is stopped.

Therefore, the vertical address counter 24 generates a Y address starting from the start position during the vertical deflection period in the period from the start position to the end position in the vertical direction of the camera position adjustment pattern.

On the other hand 1. In the horizontal address counter control section 23,
While the horizontal counter 23a is being reset by the output signal of the AND gate 30, the sample clock generation circuit 2
The sampling signals generated from 1 are counted. Further, in the horizontal capture start address setting section 23b and the horizontal capture end address setting section 23c, the central processing control section 17 shown in FIG. The start position and end position are set as horizontal deflection addresses. Therefore, when the count value of the horizontal counter 23a exceeds the output value of the horizontal capture start address setting section 23b, the comparator 23. The output of d is inverted from "L" to rH.

Then, the output of the comparator 25d is the ant gate 23
Since it is supplied to comparators 23d and 25d
The output of the comparator 23f becomes "HJ" only during a period in which the outputs of both become rH.Here, the output of the comparator 23f is rH in the normal state.

In addition, the output of the comparator 25 is also rH in the normal state.
It becomes. Therefore, when the output of the AND gate 23e is inverted to rHJ, the output of the AND gate 23h becomes "
HJ and enables the horizontal address counter 22 to perform a counting operation. Therefore, the horizontal address counter 22 counts the sampling signals generated from the sample clock generation circuit 21 and outputs the counted value as an X address.

Next, when the count value of the horizontal counter 23a exceeds the output value of the horizontal capture end address setting unit 23c indicating the end position of the camera position adjustment pattern in the horizontal direction, the output of the comparator 23f changes from "■1" to "L". to be reversed. As a result, the output of the AND gate 23g and the AND gate 23g
The output of 3h is inverted to "L" and the counting operation of the horizontal address counter 24 is stopped. Therefore, during the period in which the Addresses will be generated sequentially from the horizontal address counter 22.

Then, the X address generated from the horizontal address counter 22 and the X address generated from the vertical address counter 24 are combined and output, thereby becoming an address signal.

In the above embodiment, one cathode ray tube is used for each of the three primary colors, but the present invention can be similarly applied to an apparatus using a plurality of tubes.

Furthermore, although a case has been described in which the cathode ray tube in charge of green color is used as the reference tube, the present invention is not limited to this, and it goes without saying that any cathode ray tube may be used as the reference tube. - [Effects of the Invention] As explained above, the convergence adjustment method and device according to the present invention uses a video camera to capture an X-Y matrix camera position 'Il'A adjustment pattern displayed by a reference cathode ray tube. From this signal, an address signal is generated for capturing only the display portion of this camera position adjustment pattern, and each adjustment area divided by the camera position adjustment pattern is determined and individually displayed in sequence on each cathode ray tube. A digital conversion signal of the output signal of the video camera that has taken a display image of the convergence error detection pattern corresponding to the camera position adjustment pattern is captured by the address signal, and a difference between the captured signal and the measurement tube with respect to the reference tube is converted. This signal is supplied to the digital convergence section in the display device as an image correction signal.

Therefore, in the convergence adjustment method and device configured as described above, by setting the address signal, it is possible to match the deviation between the adjustment point and the convergence correction point by acting in the same manner as moving the camera. This allows highly accurate convergence adjustment to be performed easily and efficiently. Furthermore, since the video camera can be attached to the screen simply by setting the entire screen as its photographing range, the attachment of the video camera becomes extremely easy. Furthermore, since a mechanism for moving the video camera is not required, various excellent effects such as a simplified configuration can be obtained.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram for explaining an embodiment of the convergence adjustment method and apparatus according to the present invention, FIG. 2 is a camera position adjustment pattern, FIG. 3 is a convergence error detection pattern, and FIG. 4 is a diagram similar to the first embodiment. A block diagram showing a specific example of the convergence error detection section shown in FIG.
FIG. 3 is a circuit diagram showing details of the address signal generating section shown in the figure. 1---Video projector device, 2-----
・-Budeo projector part, 3・-111--Digital convergence section, 4-1---Video camera, 5
−−−−−−Convergence adjustment device, 6−・−・
- Signal generation unit, 7 ---- Convergence error detection unit, 8 ---- to ---- Screen, 9 ---- One camera position adjustment pattern, 1 (1 ---- to ---- Adjustment area, 1
1-.-Convergence error detection pattern. Applicant: NEC Home Electronics drawings, 6′-r: Length: None) Figure 1 Figure 2 Procedural Amendment (Chibe) (Otsu Showa 02JR-8J114 Day 1, Showa 62 Patent Application No. 107504 2 Name of the invention Convergence adjustment method and device 1 Person making the amendment 4 Date of amendment order (1) Specification i+1 Part 3, line 13, beginning of the ``λ claims'' [1 Details of the invention Amended as "Explanation." Wow, rma\ Procedural amendment t'aK;) Showa 2, 10 JII 2, 1, li indication of patent application No. 10754 of 1988) 4 No. 2 Title of the invention: 1 No. 1 'J adjustment method and device 3, correction person 4, capture;

Claims (2)

[Claims] (1) Convergence for a display device that has a digital convergence unit that combines images displayed by multiple cathode ray tubes by projecting them onto a screen to display one screen, and processes the convergence for each of the cathode ray tubes by digital control. In the control, an address signal for capturing only the displayed portion of the camera position adjustment pattern is generated from a signal captured by a video camera of an X/Y matrix camera position adjustment pattern displayed by a reference cathode ray tube. At the same time, each adjustment area divided by the camera position adjustment pattern was determined and set as an adjustment area, and a display image of a convergence error detection pattern corresponding to the camera position adjustment pattern that was sequentially and independently displayed by each cathode ray tube was photographed. A digital conversion signal of the output signal of the video camera is captured by the address signal, and the difference between the captured signal and the measurement tube relative to the reference tube is supplied as a convergence correction signal to the digital convergence section of the display device, and displayed on all cathode ray tubes. A convergence adjustment method characterized by matching images on a screen. (2) a display device having a digital convergence unit that combines images displayed by a plurality of cathode ray tubes by projecting them onto a screen to display one double-sided image, and processes convergence for each of the cathode ray tubes by digital control; This display device displays a camera position adjustment pattern for the video camera whose shooting area is the entire area of the screen projected and displayed, and the reference cathode ray tube, and sequentially displays a convergence error detection pattern for each of the cathode ray tubes. a signal generating section that generates a signal for controlling the camera position adjustment pattern, and generates an address signal indicating the range indicated by the camera position adjustment pattern from a video signal generated from the video camera that captures the camera position adjustment pattern; By capturing and calculating the video signal that captures the convergence error detection pattern displayed by the cathode ray tube using the address signal, the amount of convergence deviation between the reference cathode ray tube and other cathode ray tubes is detected, and this value is used as the convergence correction signal. A convergence adjustment device comprising: a convergence error detection section that supplies data to a digital convergence section of the display device to perform convergence correction control.