KR20150114810A - Display apparatus, control method thereof, and display system - Google Patents

Abstract

The present invention relates to a display device and a control method thereof. The display device according to an embodiment of the present invention comprises: a display; a signal processing unit processing an image signal into an image which can be displayed on the display; one or more external display devices; a communication interface communicating with a camera for photographing the display device and one or more external display devices; and a control unit receiving the photographed images from the camera while predetermined identification images are displayed respectively on the display and one or more external display devices to control operation of image processing for at least one among the signal processing unit and one or more external display devices, based on a display state of each identification image shown in the photographed image, thereby correcting a non-matching state between the images shown respectively on the display and one or more external display devices.

Description

DISPLAY DEVICE AND CONTROL METHOD THEREOF, DISPLAY APPARATUS, CONTROL METHOD THEREOF, AND DISPLAY SYSTEM,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device capable of displaying an image signal received from the outside and displaying the image, and a display system including a plurality of such display devices, And a method of controlling the same, and a display system.

A display device is a device that processes video signals / video data input from the outside or stored in the inside by various processes and displays the video signal / video data on a display panel or a screen as an image, , A portable media player, and the like.

Since a large screen is required in a use environment in which a user at a remote location, such as a public place or an outdoor place, can view an image, a display device having a large panel size can be applied. However, it may be difficult to implement a large screen with one panel due to various factors such as technology, cost, environment, etc. In this case, a method of implementing a single display system by arranging a plurality of display devices in various forms is also possible . A typical example of such a display system is a video wall in which a plurality of display devices or display panels are arranged in a matrix form.

However, the video wall may be configured not only in a matrix form, but also in various non-matrix forms such as arranging each display apparatus by an oblique line, or may be composed of a plurality of display apparatuses having screens of different sizes. When an image that can be recognized naturally by the user on the entire screen by the irregularly shaped video wall is displayed, it is necessary to appropriately adjust the image displayed on each display device in accordance with the distance between the display devices or the relative arrangement relationship The bars and videowars shall be provided with a related configuration.

A display device according to an embodiment of the present invention includes: a display; A signal processor for processing the video signal to display the video signal on the display; A communication interface for communicating with the at least one external display device, the camera capturing the display device and the at least one external display device; And a controller for controlling the signal processing unit and the image processing unit based on a display state of each of the identification images displayed in the captured image when the taken image photographed while the predetermined identification image is displayed on the display and the one or more external display devices is received from the camera, And a controller for controlling an adjustment of an unmatched state between images displayed on the display and the one or more external display devices by adjusting an image processing operation of at least one of the one or more external display devices .

Here, the unmatched state may be a spatial incoherence between the first image and the second image among a plurality of images displayed on the display and the one or more external display devices, respectively.

Here, the controller may correct the spatial mismatch by controlling an image scaling operation by at least one of the signal processing unit and the one or more external display devices.

Here, the control unit may calculate a physical distance between the first image and the second image in the photographed image, and calculate, based on the calculated physical interval, the physical distance between the first display and the second display, The image scaling operation by the first device displaying the image or the second device displaying the second image can be controlled.

Here, the physical distance between the first image and the second image is a sum of the bezel width of the first device, the bezel width of the second device, and the interval between the first device and the second device .

The unmatched state may include a sync mismatch between an image displayed on at least one of the display device and the one or more external display devices, and an image displayed on the remaining device.

Here, the control unit may control to display the same identification image on the display and the external display device, respectively.

Here, the controller may further include a third device, which is inconsistent in synchronization with the remaining device among the display device and the one or more external display devices, according to a change of each of the identification images, Can be determined.

Here, the control unit may calculate a time value deviating from the video display timing by the third device based on the change time point of each of the identification images displayed in the captured image, and calculate a delay value corresponding to the calculated time value The timing of the video displayed on the third device can be adjusted.

Also, the identification images displayed on the display and the one or more external display devices may include mutually different images, and the controller may control the display device and the display device based on the content of the identification image in the captured image, It is possible to determine the relative position between the external display devices.

Further, a method of controlling a display device according to an embodiment of the present invention includes: communicating with at least one external display device, a camera that photographs the display device and the at least one external display device; Displaying a predetermined identification image; Receiving from the camera a photographed image photographed while the identification image is displayed on the display and the one or more external display devices, respectively; And controlling the image processing operation of at least one of the display device and the one or more external display devices based on a display state of each of the identification images displayed in the captured image, And correcting an unmatched state between the images displayed on the display unit.

Here, the unmatched state may be a spatial incoherence between the first image and the second image among a plurality of images displayed on the display device and the one or more external display devices, respectively.

Here, the calibration step may include correcting the spatial mismatch by controlling an image scaling operation by at least one of the display device and the at least one external display device.

The step of calibrating the spatial non-coincidence may include calculating a physical interval between the first image and the second image in the captured image; And controlling the image scaling operation by the first device displaying the first image or the second device displaying the second image among the display device and the one or more external display devices based on the calculated physical interval .

Here, the physical distance between the first image and the second image is a sum of the bezel width of the first device, the bezel width of the second device, and the interval between the first device and the second device .

The unmatched state may include a sync mismatch between an image displayed on at least one of the display device and the one or more external display devices, and an image displayed on the remaining device.

Here, the displaying of the identification image may include controlling the same identification image to be displayed on each of the display device and the external display device.

Here, the calibration step may include a third step of synchronizing the display device and the at least one external display device with the remaining device in accordance with a change of each of the identification images, And determining the device.

Here, the calibration step may include calculating a time value at which the third device deviates the image display timing based on the change time point of each of the identification images displayed in the captured image; And adjusting a timing of an image displayed on the third device with a delay value corresponding to the calculated time value.

In addition, the identification images displayed on the display device and the one or more external display devices may include mutually different images, and the display device and the external display device And determining a relative position between the first and second regions.

According to another aspect of the present invention, there is provided a display system including: a plurality of display devices capable of displaying images; A camera for photographing the plurality of display devices; And a host device for controlling the display of the image on each of the plurality of display devices based on a relative position between the plurality of display devices, wherein the host device comprises: a communication unit communicating with the plurality of display devices and the camera; ; Wherein at least one of the plurality of display devices is displayed on the display device based on the display state of each of the identification images displayed in the captured image when the taken images photographed while the predetermined identification images are displayed on the plurality of display devices are received from the camera And a controller for controlling the adjustment of the unconformity between images displayed on each of the plurality of display devices by adjusting one image processing operation.

1 is an exemplary view of a display system according to a first embodiment of the present invention,
FIG. 2 is an exemplary view of a display system having a structure in which a plurality of display devices are arranged in a form different from FIG. 1;
FIG. 3 is a diagram illustrating an example of displaying divided images in two display devices of the display system of FIG. 1;
Figure 4 is a block diagram of the configuration of the display system of Figure 1;
FIG. 5 and FIG. 6 are exemplary views of images displayed on each display device to determine relative positions between the display devices in the display system of FIG. 1,
FIG. 7 is a flowchart showing a control method of the host apparatus in the display system of FIG. 1;
8 is an exemplary view showing an example of an image displayed on each display device per unit time in the second embodiment of the present invention;
FIG. 9 is an exemplary view of an image displayed on each display device so as to determine a synchronous time difference of video display timing of each display device according to a second embodiment of the present invention;
10 is a flowchart showing a control method of the host apparatus according to the second embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, only configurations directly related to the concept of the present invention will be described, and description of other configurations will be omitted. However, it is to be understood that, in the implementation of the apparatus or system to which the spirit of the present invention is applied, it is not meant that the configuration omitted from the description is unnecessary.

1 is an exemplary diagram of a display system 1 according to a first embodiment of the present invention.

1, the display system 1 according to the present embodiment includes a plurality of display devices 210, 220, 230, and 240, and wired / wireless devices 210, 220, 230, And a host device 100 for providing a video signal to the host device 100. The embodiment of the display system 1 to which the concept of the present invention is applied is not limited to this embodiment, and various methods can be applied. For example, instead of the separate host device 100, a plurality of display devices 210 , 220, 230, and 240 may serve as the host apparatus 100.

The plurality of display devices 210, 220, 230 and 240 constitute a video-wall according to the present embodiment. There are various methods of implementing a predetermined image on a large screen. For example, a structure for displaying an image on one display device 210, 220, 230, 240 having a large screen panel is possible. However, in this case, it is difficult to display a screen larger than the panel size that can be realized in the technology. If the panel size becomes larger, a delay may occur in displaying the image on the panel.

The video wall is a system for displaying an image by linking a plurality of display devices 210, 220, 230, 240 rather than one display device 210, 220, 230, 240. For example, one image frame is divided into regions corresponding to the plurality of display devices 210, 220, 230, and 240, and each of the display devices 210, 220, 230, . In this way, the display system 1 can finally display one image frame on a large screen.

The plurality of display devices 210, 220, 230, and 240 are disposed parallel to each other along the wall surface or standing on the ground to realize a screen of a large screen. For example, in this figure, four display devices 210, 220, 230, and 240, which are the same model, are arranged in a 2x2 matrix according to a matrix method, but this is only an example, and the display devices 210, 220, 230, and 240 may be variously modified, and thus the present invention is not limited thereto.

For a plurality of display devices 210, 220, 230, and 240 arranged in a 2x2 matrix, the host device 100 outputs video signals to the display devices 210, 220, 230, and 240, respectively. The video frame of the video signal is divided into 2x2 corresponding to the arrangement of the display devices 210, 220, 230 and 240 and each divided area of the video frame is displayed on each of the display devices 210, 220, 230 and 240, A frame may be displayed or a specific image may be displayed only on some of the display devices 210, 220, 230, and 240 among the plurality of display devices 210, 220, 230, This operation may be performed by a plurality of display devices 210, 220, 230, 240 each determining their position within a 2x2 matrix arrangement, or the host device 100 may determine each display device 210, 220, 230, and 240, respectively.

However, the idea of the present invention is not applied to a system in which the display devices 210, 220, 230, and 240 of the same model are arranged in a matrix manner.

FIG. 2 is an exemplary view of a display system 2 having a structure in which a plurality of display devices 310, 320, 330, 340, and 350 are arranged in a form different from FIG.

As shown in FIG. 2, the display system 2 may have a plurality of display devices 310, 320, 330, 340, 350 of different models arranged in a non-matrix manner.

In the non-matrix system, each of the display devices 310, 320, 330, 340, and 350 may have different sizes or resolutions, and may be arranged in an irregular state other than a matrix matched state. In order to display an image on a plurality of display devices 310, 320, 330, 340 and 350 in which a host device (not shown) is arranged in this manner, a host device (not shown) 320, 330, 340, and 350, and the installation type information about the layout relationship between the display devices 310, 320, 330, 340, and 350, in advance. The host device (not shown) controls the display devices 310, 320, 330, 340, and 350 to appropriately display images based on the installation type information.

In particular, in order to allow the user to recognize the images displayed on the plurality of display devices 310, 320, 330, 340, and 350 as a whole, the installation type information is displayed on the display devices 310, 320, 330, 340, It should include the spacing between displayed images.

FIG. 3 is a diagram illustrating an example of displaying divided images M1 and M2 in the two display devices 210 and 220. Referring to FIG.

As shown in FIG. 3, the entire image representing a part of the triangle is divided, and the divided images M1 and M2 are displayed on the two display devices 210 and 220, respectively.

However, in the structure of the video wall, these two images M1 and M2 can not physically have an interval of zero. Basically, the display devices 210 and 220 have not only the displays 213 and 223 for displaying images, but also bezels 216 and 226, which are frames that support the upper, lower, left, and right four corners of the displays 213 and 223 . Even if the two display devices 210 and 220 are installed in such a manner that the two bezels 213 and 223 are brought into contact with each other, a physical interval between the two images M1 and M2 is basically caused by the width of the bezels 216 and 226 themselves Lt; / RTI >

In addition, a physical spacing may occur between the two bezels 216 and 226 depending on the installation of the display devices 210 and 220. In this case, the widths of the two bezels 216 and 226 and the widths of the bezels 216 and 226 A physical gap is generated between the two images M1 and M2 by the sum of the distances of the two images M1 and M2.

Therefore, if the two display devices 210 and 220 directly display the images M1 and M2 without specific scaling processing, the images M1 and M2 can be perceived to be unnatural to the user as a whole.

In this figure, when the left edge of the upper image M1 is extended, the point P2 of the display 222 of the lower display device 220 is reached, but the left edge of the lower image M2 actually starts from the point P1. That is, the two images M1 and M2 are recognized by the user as a state in which the display states are misaligned with respect to each other. In order for the two images M1 and M2 to be perceived as a whole by the user, the image M2 should be displayed in such a manner that the left edge of the lower image M2 extends from the point P2.

To this end, the host apparatus 100 controls the scaling process for each of the images M1 and M2 so that the two images M1 and M2 match with each other based on the physical distance between the two images M1 and M2 do. Here, the physical distance between the two images M1 and M2 is determined by the width W1 of the bezel 216 of the first display device 210, the width W2 of the bezel 226 of the second display device 220, W1 + W2 + W3, which is the total of the interval W3 between the display device 210 and the second display device 220. [

Various methods can be applied to the operation of matching the two images M1 and M2 based on the physical distance between the two images M1 and M2. For example, the host apparatus 100 determines an area that is not displayed by the physical distance between the two images M1 and M2 in the entire area of the image frame, and stores the remaining area excluding the determined area as the image M1, M2. ≪ / RTI > Alternatively, the host apparatus 100 specifies one image M1 in the entire area of the image frame, and displays an area not represented by the physical distance between the two images M1 and M2 on the basis of the specified image M1 The remaining area may be specified as the image M2.

Hereinafter, the configuration of the host apparatus 100 and the display apparatus 210 will be described with reference to Fig. Here, the configuration of the display devices 210, 220, 230, and 240 is described only for one of the display devices 210, 220, 230, 240, 310, 320, 330, and 340 shown in FIGS. The remaining configuration of the display device can be applied to the display device 210, and the description thereof will be omitted.

Fig. 4 is a block diagram of the configuration of the display system 1. Fig.

4, the display system 1 includes a host device 100, a display device 210, and a camera 400. [ Here, although the camera 400 is implemented as a separate apparatus from the host apparatus 100, it may be installed in the host apparatus 100. [

The host apparatus 100 includes a host processor 110 for processing a video signal according to a predetermined process, a host communication interface for outputting a video signal processed by the host signal processor 110, A host storage 130 in which data / information is stored, and a host controller 140 for controlling the operation of the host device 100. [

The host signal processing unit 110 processes image signals stored in the host storage unit 130 or received from the outside through the host communication interface 120 according to an image processing process. The type of the image processing process performed by the host signal processing unit 110 is not limited. For example, the host signal processing unit 110 may perform de-multiplexing for distributing a predetermined signal to each characteristic signal, de-interlacing to convert interlaced video signals to progressive ones, scaling to adjust video signals to predetermined resolutions, noise reduction for improving image quality, noise reduction, detail enhancement, frame refresh rate conversion, and the like.

The host signal processing unit 110 is connected to a printed circuit board (not shown) such as a chip set (not shown), memory (not shown), electronic components (not shown), wiring And an image processing board (not shown).

The host communication interface 120 performs bi-directional communication with the outside according to various wired / wireless communication protocols. The host communication interface 120 transmits a signal received from the outside to the host signal processing unit 110 or the host control unit 140 while the signal processed by the host signal processing unit 110 or the host control unit 140 is transmitted to the outside Lt; / RTI > For example, the host communication interface 120 transmits the video signal processed by the host signal processing unit 110 to the display device 210. [

The host storage unit 130 is implemented as a non-volatile memory such as a flash memory or a hard-disc drive, and stores various data and information. The host storage unit 130 is accessed by the host control unit 140 to read, write, modify, delete, and update data.

The host control unit 140 includes a central processing unit (CPU), and plays a central role in the central operation and control of all operations performed in the host apparatus 100. For example, the host control unit 140 refers to the preset information stored in the host storage unit 130 or various feedback information received through the host communication interface 120, and performs a video signal processing by the host signal processing unit 110 Operation or output operation of a video signal through the host communication interface 120, and the like.

The display device 210 includes a communication interface 211 for receiving a video signal output from the host device 100, a signal processing unit 212 for processing a video signal received through the communication interface 211, a signal processing unit 212 A display 213 for displaying an image signal processed by the display unit 210 as an image, a storage unit 214 for storing data / information, and a control unit 215 for controlling the operation of the display device 210.

The display device 210 in this embodiment is configured to display a video signal output from the host device 100 and is basically provided so as to correspond to the host device 100 with respect to the configuration other than the display 213. [

The communication interface 211 receives a video signal output from the host apparatus 100 according to a wired / wireless communication protocol and transmits the received video signal to the signal processing unit 212. In addition, the communication interface 211 can transmit information on various events and the like generated in the display device 210 to the host device 100.

The signal processing unit 212 processes the video signal transmitted from the communication interface 211 according to an image processing process and outputs the processed signal to the display 213. The signal processing unit 212 may process the video signal in consideration of the video processing process executed in the host signal processing unit 110. For example, the signal processing unit 212 may process the video signal that has already been decoded from the host device 100, The video signal can be scaled and output to the display 213.

The display 213 displays a video signal output from the signal processing unit 212 as an image. The implementation of the display 213 is not limited, and may include liquid crystal, plasma, light-emitting diodes, organic light-emitting diodes, surface- a carbon nano-tube, a nano-crystal, or the like can be applied to the display device.

The display 213 may additionally include an additional configuration depending on the implementation. For example, when the display 213 is implemented as a liquid crystal display panel (not shown) as a non-light emitting device, the display 213 includes a backlight unit (not shown) for supplying light to a panel And a panel drive substrate (not shown) for driving a panel (not shown).

The storage unit 214 is implemented as a nonvolatile memory such as a flash memory or a hard disk drive, and stores various data and information. The storage unit 214 is accessed by the control unit 215 to read, write, modify, delete, and update data.

The control unit 215 includes a CPU and plays a central role in the central operation and control of all operations performed in the display apparatus 210. [ In this embodiment, the control unit 215 can control the operation of the signal processing unit 212 so that the video signal is processed according to the information provided from the host apparatus 100. For example, And controls the signal processing unit 212 so that the video signal is scaled based on the processing information when the processing information on which area is to be scaled in the entire video frame is received from the video processing unit 100.

Under such a structure, the host apparatus 100 displays on each of the display devices 210, 220, 230, and 240 based on the installation type information indicating the installation relationship between the plurality of display devices 210, 220, 230, And controls the adjustment of the scaling for each image so that the matching between the images is matched. Adjustment of scaling for an image may be performed in the host apparatus 100 so that an image signal scaled individually for each of the display apparatuses 210, 220, 230, and 240 may be output, Scaling information may be delivered from the host device 100 to each display device 210, 220, 230, 240 so that scaling adjustments may be performed separately on the display devices 210, 220, 230, 240.

In order to obtain such installation type information, the following process is performed.

5 and 6 are views illustrating images displayed on the respective display devices 210, 220, 230, and 240 to determine the relative positions between the display devices 210, 220, 230, and 240.

5, the host apparatus 100 controls to display images 411, 412, 413, and 414, which are different from each other, on a plurality of display devices 210, 220, 230, and 240. The images 411, 412, 413 and 414 are used to distinguish the display devices 210, 220, 230 and 240 displayed with the images 411, 412, 413 and 414, 220, 230, and 240 can be distinguished from each other.

For example, each image 411, 412, 413, and 414 may include different colors.

Alternatively, as shown in FIG. 6, each of the images 421, 422, 423, and 424 may include a different number.

In this state, the camera 400 photographs the images 411, 412, 413, and 414 displayed on the plurality of display devices 210, 220, 230, and 240 and the display devices 210, 220, And transmits the photographed result to the host apparatus 100.

When the photographed image transmitted to the host apparatus 100 is distorted according to the installation position of the camera 400, the host apparatus 100 can correct the photographed image first so that the analysis is accurate. For example, when the four vertexes of the display devices 210, 220, 230 and 240 are not 90 degrees in the captured image, the host device 100 displays four vertexes of each of the display devices 210, 220, 230, After the area is corrected to be 90 degrees, analysis of the photographed image is performed.

The host apparatus 100 determines a relative placement relationship between the display devices 210, 220, 230, and 240 or a relative position between the display devices 210, 220, 230, and 240 based on the photographed result. Specifically, the host apparatus 100 can acquire identification information, size and resolution information such as the MAC addresses of the display devices 210, 220, 230 and 240 from the respective display devices 210, 220, 230 and 240 have. The host apparatus 100 analyzes the photographed image photographed by the camera 400 and specifies the display devices 210, 220, 230 and 240 on which the images 421, 422, 423 and 424 are displayed, 210, 220, 230, and 240. In this case,

When the host device 100 determines the relative position between the display devices 210, 220, 230 and 240, the host device 100 displays the images 411 and 412 displayed on the display devices 210, 220, 230, , 413, and 414 is calculated. The interval between the images 411, 412, 413 and 414 indicates the interval between the displays of the display devices 210, 220, 230 and 240 on which the images 411, 412, 413 and 414 are displayed, As described with reference to Fig. 3 above.

The host device 100 displays relative position information between the display devices 210, 220, 230 and 240 and images 411, 412, and 440 displayed on the display devices 210, 220, 230, and 240, 413, and 414, and stores and stores the installation type information.

The host apparatus 100 derives scaling factor information of an image displayed on each of the display devices 210, 220, 230, and 240 based on the installation type information. The scaling factor information includes information of a divided area displayed by each of the display devices 210, 220, 230, and 240 in the entire area of the image frame, and resolution and size information of the corresponding divided area. The host device 100 transmits the scaling factor information calculated for each display device 210, 220, 230, 240 to each of the display devices 210, 220, 230, 240.

Each of the display devices 210, 220, 230, and 240 stores the scaling factor information received from the host device 100, processes and displays the video signal received from the host device 100 based on the scaling factor information stored therein do.

Thus, the display system 1 scales the image for each of the display devices 210, 220, 230, 240 so as to match the matching between the divided images displayed on each of the plurality of display devices 210, 220, 230, So that the user can naturally recognize the entire image in which the divided images are combined.

Hereinafter, a control method of the host apparatus 100 according to the present embodiment will be described with reference to FIG.

FIG. 7 is a flowchart showing a control method of the host apparatus 100. FIG.

7, in step S100, the host apparatus 100 controls each of the plurality of display devices 210, 220, 230, and 240 to display different images for identification. In step S110, the host device 100 captures the image for discrimination displayed on the plurality of display devices 210, 220, 230, and 240 and the display devices 210, 220, 230, and 240 by the camera 400 And receives an image.

In step S120, the host apparatus 100 determines the relative positions of the display devices 210, 220, 230, and 240 based on the contents of the image for discrimination in the shot image. In step S130, the host apparatus 100 analyzes the photographed image and calculates the actual physical distance between each discriminating image.

In step S140, the host apparatus 100 controls to adjust the scaling of each image based on the calculated physical interval.

Thus, the host apparatus 100 can display the spatial matching between the images displayed on the respective display devices 210, 220, 230, and 240 to match with each other.

As described above, the first embodiment relates to an adjustment method for adjusting spatial matching between images displayed on each of the display devices 210, 220, 230, and 240. However, the incoherence that may occur between images can be temporal as well as spatial.

8 is an exemplary view showing an example of an image displayed on each of the display devices 210, 220, 230, and 240 by unit time.

8, the entire image displayed by the four display devices 210, 220, 230, and 240 is displayed in a different image from the other image as the viewpoint passes t, t + 1, t + It turns into a video. The images displayed by the four display devices 210, 220, 230, and 240 at the time point t are triangles, and the images displayed by the four display devices 210, 220, 230, and 240 at the time point t + 3 are circles. In order to allow the user to recognize the entire image naturally, when the image representing the triangle is changed to the image representing the circle, the four display devices 210, 220, 230, and 240 must display the images at the same timing in synchronization with each other .

However, when the time t changes from the time point t to the time point t + 1, only the display device 230 on the lower left of the four display devices 210, 220, 230, and 240 displays the image representing the circle first. The three display devices 210, 220 and 240 display an image representing a triangle even at the time point t + 2, only one display device 230 displays an image representing a circle. At time point t + 3, only the remaining three display devices 210, 220, and 240 display an image representing a circle.

As described above, the mismatching of the images displayed on each of the plurality of display devices 210, 220, 230, and 240 is not limited to the spatial mismatching of the first embodiment described above, 210, 220, 230, and 240, respectively. Accordingly, in order to adjust the temporal mismatching, the delay value is reflected at the video display timing of the display device 230 whose synchronization with the remaining display devices 210, 220, and 240 is not synchronized, The timing may be the same as that of the remaining display devices 210, 220, and 240.

Since the display timing of the display device 230 is faster than the remaining display devices 210, 220 and 240 by a unit time of -2 in the present embodiment, the display timing of the display device 230 is +2 The display delay value corresponding to the unit time may be reflected. In this case, at time t + 3, the images of the triangles in all the display devices 210, 220, 230, and 240 can be simultaneously converted into the original image.

FIG. 9 is a block diagram illustrating a configuration of a display device 210, 220, 230, and 240 for displaying images displayed on each of the display devices 210, 220, 230, and 240 to determine a synchronization time difference of video display timings of the display devices 210, 220, 230, and 240 according to a second embodiment of the present invention. (431, 432, 433, 444).

In the present embodiment, the host device 100 sets a state in which the relative positions of the display devices 210, 220, 230, and 240 are known, to an initial state. Therefore, if the relative positions of the plurality of display devices 210, 220, 230, and 240 are not determined, the method of steps S100 through S120 of FIG. 7 or the plurality of display devices 210, 220, 230, and 240 may be performed before the present embodiment.

9, the host apparatus 100 controls to display the same images 431, 432, 433, and 444 on the plurality of display devices 210, 220, 230, and 240, respectively. Unlike the first embodiment, the images 431, 432, 433, and 444 do not distinguish the display devices 210, 220, 230, and 240 and include content images having the same contents, And may include the same color. Since the images 431, 432, 433, and 444 are used to determine whether or not the display devices 210, 220, 230, and 240 are synchronized with each other, their contents must change over time.

The host device 100 displays the images 431, 432, 433, and 444 on the plurality of display devices 210, 220, 230, and 240 for a predetermined time. Here, the predetermined time is not limited to a specific value, but refers to a time at which the contents of the images 431, 432, 433, and 444 are identifiably changed by the host apparatus 100 at least once.

In this state, the camera 400 displays the images 431, 432, 433, and 444 reproduced by the plurality of display devices 210, 220, 230, and 240 and the display devices 210, 220, And transmits the photographed result to the host apparatus 100. The host apparatus 100 transmits the photographed result to the host apparatus 100. [

The host device 100 specifies the display devices 210, 220, 230, and 240 that are out of synchronization among the plurality of display devices 210, 220, 230, and 240 by analyzing the captured image, 220, 230, and 240 are calculated. The host apparatus 100 calculates a delay value corresponding to the calculated time value.

The host device 100 controls the output of video signals to the display devices 210, 220, 230, and 240 specified by the host device 100 by reflecting the calculated delay value. In this case, the display devices 210, 220, 230, and 240 do not adjust the display timing of the video, and instead, the timing of receiving the video signal is adjusted so that the video display timing of all the display devices 210, 220, 230, .

Alternatively, the host device 100 may transmit the calculated delay value to the specified display device 210, 220, 230, 240 so that the display device 210, 220, 230, The display timing may be adjusted.

According to this method, temporal matching between images displayed on each of the plurality of display devices 210, 220, 230, and 240 can be matched.

10 is a flowchart showing a control method of the host apparatus 100 according to the present embodiment.

As shown in FIG. 10, in step S200, the host device 100 controls the display devices 210, 220, 230, and 240 to display identical images. In step S210, the host device 100 reproduces the corresponding image on each of the display devices 210, 220, 230, and 240.

The camera 400 photographs an image reproduced on each of the display devices 210, 220, 230, and 240 for a preset time period during which the image is reproduced. In step S220, the host apparatus 100 receives the photographed image from the camera 400. [

In step S230, the host apparatus 100 determines whether the display devices 210, 220, 230, and 240 are out of synchronization with the remaining display devices 210, 220, 230, and 240 through the captured image.

If there are display devices 210, 220, 230, and 240 that are not synchronized, the host device 100 calculates the synchronization time difference of the display devices 210, 220, 230, and 240 based on the captured images in step S240. In step S250, the host apparatus 100 calculates a delay value corresponding to the calculated synchronization time difference.

In step S260, the host device 100 adjusts the video display timing of the display devices 210, 220, 230, and 240 based on the calculated delay value.

As described above, when the host device 100 receives the photographed images photographed while the predetermined identification images are displayed on the plurality of display devices 210, 220, 230, and 240 from the camera 400, 220, 230, and 240 by adjusting image processing operations of at least one of the plurality of display devices 210, 220, 230, and 240 based on the display states of the respective identification images And corrects the unconformity between the images.

According to the embodiments described above, the display system 1 can correct the temporal mismatch or spatial mismatch between images displayed on the plurality of display devices 210, 220, 230, and 240, respectively.

Although the display system 1 has been described as including the host device 100 in the above-described embodiments, any one of the plurality of display devices 210, 220, 230, and 240 may replace the host device 100 .

The above-described embodiments are merely illustrative, and various modifications and equivalents may be made by those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined by the technical idea of the invention described in the following claims.

1: Display system
100: Host device
210, 220, 230, 240: display device
400: camera

Claims (21)

In the display device,
A display;
A signal processor for processing the video signal to display the video signal on the display;
A communication interface for communicating with the at least one external display device, the camera capturing the display device and the at least one external display device;
And a controller for controlling the signal processing unit and the image processing unit based on a display state of each of the identification images displayed in the captured image when the taken image photographed while the predetermined identification image is displayed on the display and the one or more external display devices is received from the camera, And a control unit for controlling to correct an unmatching state between images displayed on the display and each of the one or more external display devices by adjusting an image processing operation of at least one of the one or more external display devices Display device. The method according to claim 1,
Wherein the unmatched state is a spatial mismatch between the first image and the second image among a plurality of images respectively displayed on the display and the one or more external display devices. 3. The method of claim 2,
Wherein the controller corrects the spatial misregistration by controlling an image scaling operation by at least one of the signal processing unit and the one or more external display devices. The method of claim 3,
Wherein the control unit calculates a physical distance between the first image and the second image in the captured image and determines that the first image among the display device and the one or more external display devices And controls the image scaling operation by the first device displayed or the second device displaying the second image. 5. The method of claim 4,
Wherein the physical distance between the first image and the second image is a sum of the width of the bezel of the first device, the width of the bezel of the second device, and the interval between the first device and the second device . The method according to claim 1,
Wherein the unmatched state includes a sync mismatch between an image displayed on at least one of the display device and the one or more external display devices and an image displayed on the remaining device. The method according to claim 6,
Wherein the control unit controls to display the same identification image on the display and the external display device, respectively. 8. The method of claim 7,
Wherein the control unit determines a third device whose synchronization does not coincide with the remaining device among the display device and the one or more external display devices in accordance with a change of each of the identification images taken in the photographed image photographed within a predetermined time And the display device. 9. The method of claim 8,
Wherein the control unit calculates a time value at which the third device deviates the video display timing based on a change time point of each of the identification images appearing in the captured image and outputs the delay value corresponding to the calculated time value And adjusts the timing of an image displayed on the third device. The method according to claim 1,
Wherein the identification images displayed on the display and the one or more external display devices include mutually different images,
Wherein the control unit determines a relative position between the display device and the external display device based on the content of the identification image in the captured image. A method of controlling a display device,
Communicating with the at least one external display device, the camera capturing the display device and the at least one external display device;
Displaying a predetermined identification image;
Receiving from the camera a photographed image photographed while the identification image is displayed on the display and the one or more external display devices, respectively;
And controlling the image processing operation of at least one of the display device and the one or more external display devices based on a display state of each of the identification images displayed in the captured image, And correcting an unconformity state between the images displayed on the display unit. 12. The method of claim 11,
Wherein the unmatched state is a spatial mismatch between a first image and a second image among a plurality of images displayed on the display device and the one or more external display devices, respectively. 13. The method of claim 12,
Wherein the correcting step includes correcting the spatial misalignment by controlling an image scaling operation by at least one of the display device and the one or more external display devices. 14. The method of claim 13,
Wherein the step of calibrating the spatial non-
Calculating a physical distance between the first image and the second image in the captured image;
And controlling an image scaling operation by a first device displaying the first image or a second device displaying the second image among the display device and the one or more external display devices based on the calculated physical interval And a control unit for controlling the display unit. 15. The method of claim 14,
Wherein the physical distance between the first image and the second image is a sum of the width of the bezel of the first device, the width of the bezel of the second device, and the interval between the first device and the second device Of the display device. 12. The method of claim 11,
Wherein the unmatched state includes a synchronization inconsistency between an image displayed on at least one of the display apparatus and the one or more external display apparatuses and an image displayed on the remaining apparatuses. 17. The method of claim 16,
Wherein the step of displaying the identification image includes the step of controlling the display device and the external display device to display the same identification image, respectively. 18. The method of claim 17,
Wherein the calibration step includes a third device that is out of synchronization with the remaining device among the display device and the one or more external display devices in accordance with a change of each of the identification images taken in the photographed image taken during a predetermined time And a step of judging whether or not the display device is in a standby state. 19. The method of claim 18,
The calibration step may include:
Calculating an offset time value of the image display timing by the third device based on a change time point of each of the identification images in the captured image;
And adjusting a timing of an image displayed on the third device with a delay value corresponding to the calculated time value. 12. The method of claim 11,
Wherein the identification images displayed on the display device and the one or more external display devices respectively include different images,
Further comprising the step of determining a relative position between the display device and the external display device based on the content of the identification image in the captured image. In a display system,
A plurality of display devices capable of displaying images;
A camera for photographing the plurality of display devices;
And a host device controlling each of the plurality of display devices to display the image on the basis of a relative position between the plurality of display devices,
The host apparatus includes:
A communication unit for communicating with the plurality of display devices and the camera;
Wherein at least one of the plurality of display devices is displayed on the display device based on the display state of each of the identification images displayed in the captured image when the taken images photographed while the predetermined identification images are displayed on the plurality of display devices are received from the camera And a control unit for controlling to correct an unmatching state between images displayed on each of the plurality of display devices by adjusting one image processing operation.

Images