Patent Publication Number: US-2020293258-A1

Title: Layout identification method for display wall, and electronic device using the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial no. 108108168, filed on Mar. 12, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     TECHNICAL FIELD 
     The disclosure relates to an identification technology; more specifically, the disclosure relates to a layout identification method for a display wall formed by stitching a plurality of displays and an electronic device and a display system using the method. 
     DESCRIPTION OF RELATED ART 
     A display wall (commonly referred to as a TV wall) is a large display screen wall formed by stitching displays; according to the way to arrange the displays, a control host of the display wall can control the displays to respectively display divided parts of an image, and the divided parts are combined to create a complete large image. In general, conventional displays having the same dimension are mostly stitched in a horizontal or vertical direction on a display wall without overlapping each other. However, in order to comply with the requirements for a more vivid and aesthetic design or special style, it is now common for manufacturers to stitching and assembly a plurality of displays of different sizes or/and at different tilt angles. Under certain circumstances and given some requirements, the arrangement or orientation of the displays on the display wall may be changed, the number of displays may be increased or decreased, or the displays may be replaced, thereby resulting in different layouts. Therefore, as long as the layout of the displays changes, users are bound to do re-measurement and calculation as well as input the new layout to the control host, so that the control host can correctly and collectively use these displays to display large images. 
     Manual measurement and calculation of the display layout of the displays is however time-consuming, labor-intensive, and inaccurate; moreover, if the display wall is at a high place or at another inaccessible position, the measurement and the calculation become less feasible. 
     SUMMARY 
     In view of the above, one or more embodiments of the disclosure provide a layout identification method of a display wall and an electronic device and a display system using the method, so as to accurately obtain a layout of the display wall with ease and inform an image management device of the display wall of the obtained layout. 
     In an embodiment of the disclosure, a layout identification method of a display wall applicable to an electronic device is provided, wherein the display wall is formed by stitching a plurality of displays to establish an actual layout according to a preset layout. The layout identification method includes following steps: displaying a preset image respectively through a signal by the displays of the display wall; capturing an image of the actual layout of the display wall through an image capturing element to obtain a display wall image of the display wall; identifying the display wall image according to an image analysis on the preset images, so as to obtain a virtual layout of the displays corresponding to the actual layout. 
     In an embodiment of the disclosure, an electronic device which can be used together with a display wall is provided, wherein the display wall is formed by stitching a plurality of displays to establish an actual layout according to a preset layout. The electronic device includes a communication module, an image capturing element, and a processor. The communication module is capable of electrically communicating with the displays of the display wall. The image capturing element is configured to capture an image of the actual layout of the display wall to obtain a display wall image of the display wall. The processor is electrically coupled to the communication module and the image capturing element and configured to: instruct the plurality of displays respectively to display a preset image by the plurality of displays through the communication module and identify the display wall image according to an image analysis on the preset images to obtain a virtual layout of the plurality of displays corresponding to the actual layout. 
     To make the above features and advantages provided in one or more of the embodiments of the disclosure more comprehensible, several embodiments accompanied with drawings are described in detail as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles described herein. 
         FIG. 1  is a schematic view of a display system according to an embodiment of the disclosure. 
         FIG. 2  is a block view of an electronic device according to an embodiment of the disclosure. 
         FIG. 3  is a flow chart of a layout identification method according to an embodiment of the disclosure. 
         FIG. 4  is a flow chart of a display method according to an embodiment of the disclosure. 
         FIG. 5  is a schematic view of a preset pattern according to an embodiment of the disclosure. 
         FIG. 6A  to  FIG. 6G  schematically illustrate image identification according to an embodiment of the disclosure. 
         FIG. 7  is a schematic view of a virtual layout according to an embodiment of the disclosure. 
         FIG. 8  is a schematic view of a display image according to an embodiment of the disclosure. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Some embodiments are provided in detail below with reference to the accompanying drawings. When the same reference numbers appear in different figures, they will be regarded as indicating the same or similar components. These embodiments are only part and are not all embodiments of the disclosure. More particularly, these embodiments are examples of a method, a device, and a system provided in the claims of this disclosure. 
       FIG. 1  is a schematic view of a display system according to an embodiment of the disclosure. 
     With reference to  FIG. 1 , the display system provided in the embodiment includes an electronic device  100 , an image management device  200 , and a display wall  300 . 
     In the embodiment, the display wall  300  includes displays  310 - 1  to  310 - 6  fixed to a wall surface  320  according to a specific layout, and the actual number of the displays and the layout on the display wall  300  are not limited in the disclosure. Note that the so-called display in this disclosure may include any type of display having display capabilities, such as a TV screen, a computer screen, a projection screen, a cell phone screen, and so on, and the so-called display wall refers to an assembly of these displays stitched and fixed to the wall surface  320 . 
     In the embodiment, the image management device  200  is electrically coupled to the displays  310 - 1  to  310 - 6  on the display wall  300  through a cable or in a wireless manner; the layout of the displays  310 - 1  to  310 - 6  on the display wall  300  can be set, and the divided images displayed on each of the displays  310 - 1  to  310 - 6  can be arranged according to the set layout, so as to collectively display the complete large display image through the displays  310 - 1  to  310 - 6 . For instance, the image management device  200  may be a personal computer (PC), a notebook computer, a tablet PC, a server, a smart phone, and so forth, which should not be construed as a limitation in the disclosure. 
     In the embodiment, the electronic device  100  is electrically coupled to the displays  310 - 1  to  310 - 6  and the image management device  200  through a cable or in a wireless manner. Note that the electronic device  100  is capable of taking pictures and doing calculations and thus can be applied to capture a display wall image of the display wall  300  and calculate and simulate a virtual layout of the displays  310 - 1  to  310 - 6  corresponding to actual layout according to the display wall image. Besides, the electronic device  100  also transmits the simulated virtual layout to the image management device  200 . However, in other embodiments provided in the disclosure, the electronic device  100  can also perform some functions of the image management device  200  (e.g., store images, divide images, set the layout, and so on) or even be integrated to the image management device  200 . Namely, the image management device  200  may be a functional unit (capable of processing and managing images), regardless of whether it is independent from or integrated into the electronic device  100  and whether it is hardware or software. As such, even though there is any change to the number of displays on the display wall  300  and the actual layout, the settings in the image management device  200  can be easily updated through the capturing operation performed by the electronic device  100 . For instance, the electronic device  100  may be a digital camera having an image capturing lens, a smart phone having the same, a tablet PC having the same, a handheld game console having the same, and so on, which should not be construed as a limitation in the disclosure. 
       FIG. 2  is a block view of an electronic device according to an embodiment of the disclosure. 
     With reference to  FIG. 2 , the electronic device  100  provided in the embodiment includes an image capturing element  101 , a communication module  103 , and a processor  105 , wherein the image capturing element  101  and the communication module  103  are electrically coupled to the processor  105 . 
     The image capturing element  101  is configured to obtain an image. For instance, the image capturing element  101  can be built in or externally connected to the body of the electronic device  100  and equipped with a charge coupled device (CCD), a complementary metal-oxide semiconductor (CMOS) device, or an image capturing lens of another type of photosensitive device, which should not be construed as a limitation in the disclosure. In the embodiment, the image capturing element  101  can be configured to capture a display wall image of the display wall  300 . 
     The communication module  103  is configured to receive signals and data. For instance, the communication module  103  may include a cabled module, such as an Ethernet module, an HDMI module, and a USB module, or a wireless module, such as a 3G module, a 4G module, a Bluetooth module, a wireless fidelity (Wi-Fi) module, a LoRa module, an SIGFOX module, an NB-IoT module, or a combination of the aforesaid modules and modules adopting other communication technologies, which should however not be construed as a limitation in the disclosure. In the embodiment, the communication module  103  can electrically communicate with the image management device  200  and the displays  310 - 1  to  310 - 6  of the display wall  300  through any of the above-mentioned cabled or wireless modules and is configured to transmit data with the display  310 - 1  to  310 - 6  and the image management device  200 . 
     The processor  105  is responsible of performing the layout identification method of the display wall  300 . For instance, the processor  105  may be a dual-core, quad-core, octa-core, or any other type of central processing unit (CPU), a system-on-chip (SOC), an application processor, a media processor, a microprocessor, a digital signal processor, a programmable controller, an application specific integrated circuit (ASIC), a programmable logic device (PLD), any other similar device, or a combination of the above. The type of the processor practically implemented in the real world is not limited in the disclosure. In the embodiment, the processor  105  executes display wall layout identification software provided by the electronic device  100  and accordingly performs steps of the layout identification method. The detailed steps of the layout identification method will be described in the following paragraphs. 
     For accurate identification, the electronic device  100  provided in the embodiment further includes an accelerometer  107  and a gyroscope  109  both electrically coupled to the processor  105 . In some embodiments, the electronic device  100  may not include any accelerometer  107  nor any gyroscope  109 . People having ordinary skill in the pertinent field can learn the structures and the way to operate the accelerometer  107  and the gyroscope  109  according to relevant published technical documentation, and therefore no further explanation will be given hereinafter. 
       FIG. 3  is a flow chart of a layout identification method according to an embodiment of the disclosure;  FIG. 4  is a flow chart of a display method according to an embodiment of the disclosure. 
     The layout identification method and the display method provided in the embodiment are adapted to the display system and the electronic device  100  described in the embodiments depicted in  FIG. 1  and  FIG. 2 , and therefore the explanation below will be given with reference to the display system and the electronic device  100  described in the embodiments depicted in  FIG. 1  and  FIG. 2 . It should be mentioned that the layout identification method provided in the embodiment is not limited to be performed through the display system and the electronic device  100  described in the embodiments depicted in  FIG. 1  and  FIG. 2 . 
     With reference to  FIG. 3 , the electronic device  100  has the displays  310 - 1  to  310 - 6  of the display wall  300  respectively display a preset image through a signal (step S 301 ). For instance, the processor  105  executes layout identification software, and a user is able to use buttons provided on a user interface of the software, so that the electronic device  100  issues signals that require displays  310 - 1  to  310 - 6  to respectively display the preset images. In an embodiment, the preset images are stored in the memory (not shown) of the electronic device  100 ; after the processor  105  receives the signals, the processor  105  respectively transmits the preset images to the displays  310 - 1  to  310 - 6  through the communication module  103 . After the displays  310 - 1  to  310 - 6  receive the signal, the displays  310 - 1  to  310 - 6  respectively display the preset images. 
     According to some embodiments, the preset images are stored in the memory (not shown) of each of the displays  310 - 1  to  310 - 6  in advance, for instance, and the processor  105  respectively transmits a trigger signal to each of the displays  310 - 1  to  310 - 6  through the communication module  103 . After the displays  310 - 1  to  310 - 6  receive the trigger signals, the displays  310 - 1  to  310 - 6  respectively display the preset images. 
     In some embodiments, the preset images are stored in the image management device  200  in advance, for instance, and the processor  105  transmits a trigger signal to the image management device  200  through the communication module  103 . After the image management device  200  receives the trigger signal, the image management device  200  inputs the preset image respectively into each of the displays  310 - 1  to  310 - 6 , so as to have each of the displays  310 - 1  to  310 - 6  respectively displays the preset image. 
     In some embodiments, the processor  105  directly transmits an image signal including the preset image to each of the displays  310 - 1  to  310 - 6  through the communication module  103  or transmits the image signal to the image management device  200 , for instance, and the image management device  200  inputs the preset image to each of the displays  310 - 1  to  310 - 6 , so as to have each of the displays  310 - 1  to  310 - 6  respectively display the preset image. As such, the electronic device  100  can determine the content of the preset image. 
     In order to identify the display range of each of the displays  310 - 1  to  310 - 6  in subsequent steps, note that the displays  310 - 1  to  310 - 6  display the preset images in a full-screen manner. More particularly, even though the length-to-width ratio of each of the displays  310 - 1  to  310 - 6  is different, the length or width of the preset image is proportionally scaled up or down while the preset image is being displayed, so that the display range of each of the displays  310 - 1  to  310 - 6  is filled with the preset image. In order to identify the display range of each of the displays  310 - 1  to  310 - 6  in subsequent steps, note that the displays  310 - 1  to  310 - 6  display the preset images in a full-screen manner. 
     The electronic device  100  then obtains a display wall image of the display wall  300  (step S 303 ). For instance, after each of the displays  310 - 1  to  310 - 6  displays the preset image, the user is able to capture the image of the display wall  300  by using the image capturing element  101  of the electronic device  100 , so as to obtain the display wall image of display wall  300  including all of the displays  310 - 1  to  310 - 6  thereon. 
     According to some embodiments, the user is able to hold the electronic device  100  at any position or angle and capture the image, and therefore the relative angle between the lens of the image capturing element  110  during the image capturing action and the wall surface of the display wall  300  can vary. While the electronic device  100  obtains the display wall image of the display wall  300  by using the image capturing element  101 , the electronic device  100  also obtains accelerometer data by using the accelerometer  107  and obtains gyroscope data by using the gyroscope  109 . As such, in the subsequent steps, the virtual layout of the displays  310 - 1  to  310 - 6  can be accurately calculated according to the captured display wall image. 
     According to the preset images, the electronic device  100  then identifies the obtained display wall image, so as to obtain the virtual layout of the displays  310 - 1  to  310 - 6  (step S 305 ). Particularly, the display wall image includes the displays  310 - 1  to  310 - 6  displaying the preset pattern in a full-screen manner; therefore, given that the preset pattern is known, the electronic device  100  can identify the location of the display range of the displays  310 - 1  to  310 - 6  according to the preset pattern in the display wall image and identify which display range belongs to each display according to display identification numbers in the display wall image, so as to obtain the virtual layout of the displays  310 - 1  to  310 - 6 . 
     In some embodiments, the processor  105  calibrates the crooked display wall image according to the accelerometer data and the gyroscope data and calculates the virtual layout of the displays  310 - 1  to  310 - 6  according to the preset images. 
     The electronic device  100  then sends the calculated virtual layout to the image management device  200  of the displays  310 - 1  to  310 - 6  (step S 308 ). 
     In some embodiments, the virtual layout is, for instance, displayed in form of the data structure [“display identification number”, “location of the display range”] and transmitted to the image management device  200 , wherein the “location of the display range” includes coordinates of the upper-left corner and upper-right corner of the display range, for instance, which should however not be construed as a limitation in the disclosure. 
     With reference to  FIG. 4 , the image management device  200  divides the display image into a plurality of divided images according to the virtual layout of the displays  310 - 1  to  310 - 6  (step S 401 ). Specifically, after the electronic device  100  receives the virtual layout of the displays  310 - 1  to  310 - 6 , the image management device  200  configures the settings according to the virtual layout. When the image management device  200  has the demand for displaying the display image by using the display wall  300 , the image management device  200  divides the display image into a plurality of divided images according to the set virtual layout, wherein each of the divided images corresponds to one of the displays  310 - 1  to  310 - 6 . For instance, according to the location of the display range of each of the displays  310 - 1  to  310 - 6 , the image management device  200  divides the display image into a first divided image corresponding to the display  310 - 1 , a second divided image corresponding to the display  310 - 2 , a third divided image corresponding to the display  310 - 3 , a fourth divided image corresponding to the display  310 - 4 , a fifth divided image corresponding to the display  310 - 5 , and a sixth divided image corresponding to the display  310 - 6 . 
     Next, the image management device  200  respectively inputs the divided images into the corresponding displays, so as to display the complete display image through the display wall  300  (step S 403 ). For instance, the image management device  200  inputs the first divided image into the corresponding display  310 - 1 , inputs the second divided image into the corresponding display  310 - 2 , inputs the third divided image into the corresponding display  310 - 3 , inputs the fourth divided image into the corresponding display  310 - 4 , inputs the fifth divided image into the corresponding display  310 - 5 , and inputs the sixth divided image into the corresponding display  310 - 6 . As such, the displays  310 - 1  to  310 - 6  can respectively display the first divided image, the second divided image, the third divided image, the fourth divided image, the fifth divided image, and the sixth divided image; namely, the display wall  300  can display the complete display image by stitching the divided images. 
     The layout identification method and the display method provided in one or more embodiments of the disclosure are elaborated below with reference to the drawings. 
       FIG. 5  is a schematic view of a preset pattern according to an embodiment of the disclosure. 
     With reference to  FIG. 5 , the preset pattern PTN includes a first color edge C 1  and a second color frame C 2  of different colors, for instance, and a position recognition pattern PR is located at a predetermined position inside the second color frame C 2 , wherein the dimension scale of each part of the preset pattern PTN is known and is not limited in the disclosure. 
     What is more, in some embodiments, the first color edge C 1  is configured to differentiate the side frame of the displays from the second color frame C 2 , so as to prevent misidentification of the range of the second color frame C 2  during the image identification (e.g., when the color of the second color frame C 2  is identical or similar to the color of the side frame of the displays). Accordingly, the color of the first color edge C 1  is preferably designed to be apparently different from the color of the second color frame C 2 . For instance, when the second color frame C 2  is black, the first color edge C 1  can be designed to be white. In another aspect, the position recognition pattern PR is configured to make sure the orientation of the displays, and therefore it is better not to arrange the position recognition pattern PR at the center of the second color frame C 2  nor to arrange the position recognition pattern PR on a horizontal bisection line or vertical bisection line of the second color frame C 2 . In the embodiment, the position recognition pattern PR is constantly arranged at the upper-left corner. As such, the processor  105  can derive the location and the orientation of the displays from identifying the location and the angle of the position recognition pattern PR. 
     In the embodiment, the position recognition pattern PR is designed to be a rectangular frame surrounding a white square, which should however not be construed as a limitation in the disclosure. According to other embodiments, the position recognition pattern PR can be designed as any other pattern recognizable through image identification, e.g., a QR code or the like. In the embodiment, note that the preset pattern PTN serves as an exemplary preset pattern in the preset image but should not be construed as a limitation in the disclosure. People having ordinary skill in the pertinent art can design the preset pattern according to actual requirements. 
       FIG. 6A  to  FIG. 6G  schematically illustrate image identification according to an embodiment of the disclosure. In the embodiment, the actual shape of the displays is assumed to be rectangular, and the following steps are performed for image identification. It should be mentioned that the shape of the displays on the display wall is not limited in the disclosure, and people having ordinary skill in the pertinent art can adjust the algorithm for the image identification without departing from the scope or spirit of the disclosure according to the actual requirements. 
     As shown in  FIG. 6A , after the displays respectively display the preset images in the full-screen manner (e.g., including the display identification numbers and the preset patterns PTN), the image capturing element  101  can capture the display wall image IMG. From the display wall image IMG, it can be learned that the display wall  300  provided in the embodiment includes three rectangular displays with the display identification numbers  0000 ,  0002 , and  0003  and one square display with the display identification number  0001 . The display with the display identification number  0000  displays a preset image a 0 , the display with the display identification number  0001  displays a preset image a 1 , the display with the display identification number  0002  displays a preset image a 2 , and the display with the display identification number  0003  displays a preset image a 3 . 
     As shown in  FIG. 6B , the processor  105  executes an image identification program to find out the contour of the preset pattern from the display wall image IMG. For instance, the processor  105  adopts the OpenCV findContour function or the like to find out the contour of the second color frame C 2  and approximates each profile to a quadrilateral by adopting the OpenCV approxPolyDP function or the like. The processor  105  then enlarges each approximated quadrilateral to be corresponding to the first color edge C 1  according to the dimension scale of each part of the preset pattern PTN. More specifically, if the preset pattern PTN is a rectangle with the length-to-width ratio of 1920*1080, a length ratio of the preset pattern PTN, the first color edge C 1 , and the second color frame C 2  is 1920:60:60, and a width ratio is 1080:60:60, then the processor  105  elongates two long sides of each approximated quadrilateral up to 1920/1800 times the original length and elongates two short sides of each approximated quadrilateral up to 1080/960 times the original length. As such, fourth outer frames b 0  to b 3  can be obtained. 
     As shown in  FIG. 6C , the processor  105  rotates outer frames b 0  to b 3  according to the accelerometer data and the gyroscope data of the electronic device  100  obtained while the display wall image IMG is being taken, so as to comply with the preset standard. For instance, if the normal vector of the screen surface of the electronic device  100  is parallel to the Z axis, the direction of the short side of the screen is parallel to the X axis, and the direction of the long side of the screen is parallel to the Y axis, then the X axis can be set as being parallel to the ground, which is the assumed preset standard. According to the accelerometer data and the gyroscope data, these settings allow the processor  105  to determine that the electronic device  100  should be rotated by a specific angle along the Z axis, for instance, so that the X axis can be parallel to the ground, and the outer frames b 0  to b 3  are then rotated by said specific angle in a reverse direction. As such, fourth outer frames c 0  to c 3  can be obtained. 
     As shown in  FIG. 6D , subject to the image-capturing angle, the image identification program, and so on, the four outer frames c 0  to c 3  are quadrilateral but may not be rectangular. Hence, the processor  105  can, for instance, find out four smallest rectangular outer frames d 0  to d 3  respectively surrounding the four outer frames c 0  to c 3  by adopting the OpenCV minAreaRect function or the like. 
     In the embodiment, it is assumed that no small included angle is left on purpose between every two of the displays of the display wall  300 . Hence, as shown in  FIG. 6E , the processor  105  performs angle calibration on all rectangular outer frames d 0  to d 3 . For instance, when an angle between long sides and short sides of any two of the rectangular outer frames d 0  to d 3  is smaller than a preset threshold angle, the processor  105  rotates the two rectangular outer frames to be at an identical angle. Thereby, four rectangular outer frames e 0  to e 3  that have undergone the angle calibration can be obtained. 
     In the embodiment, it is assumed that the display wall  300  does not contain any two displays with similar but different dimensions (e.g., a 40-inch display and a 41-inch display). Therefore, as shown in  FIG. 6F , the processor  105  performs dimension calibration on rectangular outer frames e 0  to e 3 . For instance, when a length difference between any two long sides of any two of the rectangular outer frames e 0  to e 3  is less than a preset first threshold length difference, and a length difference between any two short sides of any two of the rectangular outer frames e 0  to e 3  is less than a preset second threshold length difference, the processor  105  adjusts the two rectangular outer frames to be of an identical dimension. Thereby, four rectangular outer frames f 0  to f 3  that have undergone the dimension calibration can be obtained. 
     In some embodiments, the layout identification software executed by the processor  105  provides a display selection interface, which allows the user to input the information (e.g., model number, dimensions, and so on) of all displays on the display wall  300  (or these information has been pre-stored), and the displays are linked to the display identification numbers, respectively. According to the information of the displays, the processor  105  can perform accurate dimension calibration on the rectangular outer frames e 0  to e 3 , so as to obtain four rectangular outer frames f 0  to f 3 . 
     After the dimension calibration is performed, the four rectangular outer frames f 0  to f 3  may be overlapped. Hence, as shown in  FIG. 6G , the processor  105  aligns the fourth rectangular outer frames f 0  to f 3 . For instance, if a distance between any two vertices of any two of the rectangular outer frames f 0  to f 3  is overly small, the processor  105  adjusts the two vertices to be at the same location. For instance, the distance between the upper-right vertex of the outer frame f 0  and the upper-left vertex of the outer frame fl is smaller than the preset threshold distance, and the distance between the lower-right vertex of the outer frame f 0  and the lower-left vertex of the outer frame fl is smaller than the preset threshold distance. Therefore, the processor  105  aligns the outer frame f 0  and the outer frame fl, so that the right short side of the outer frame f 0  and the left short side of the outer frame fl are overlapped; the rest can be deduced therefrom, so as to obtained the aligned outer frames g 0  to g 3 . 
       FIG. 7  is a schematic view of a virtual layout according to an embodiment of the disclosure. 
     With reference to  FIG. 7 , according to the outer frames g 0  to g 3 , the processor  105  can obtain the virtual layout  700  of the four displays on the display wall  300  and the corresponding actual layout of the display wall  300 . In the embodiment, the virtual layout  700  includes a display range DR 0  of the upper-left display with the display identification number  0000 , a display range DR 1  of the upper-right display with the display identification number  0001 , a display range DR 2  of the lower-left display with the display identification number  0002 , and a display range DR 3  of the lower-right display with the display identification number  0003 . 
     What is more, the virtual layout  700  is, for instance, displayed in form of the data structure ((display identification number, location of the display range), and the location of the display range may be represented by a coordinate of the upper-left corner and lower-right corner of the display range. In the embodiment, the processor  105  determines the upper-left corner and lower-right corner of the display range according to the location of the position recognition pattern PR. 
     As illustrated in  FIG. 7 , according to the position recognition pattern PR in the outer frames g 0  to g 3 , in the virtual layout  700 , the upper-left corner of the display range DR 0  of the display with the display identification number  0000  is the corner on the upper-left side of the display range DR 0  in  FIG. 7 , but the upper-left corner of the display range DR 3  of the display with the display identification number  0003  refers to the corner on the upper-right side of the display range DR 3  in  FIG. 7 . 
     According to some embodiments, the electronic device  100  transmits the virtual layout  700  to the image management device  200  of the four displays, for instance, and the image management device  200  can set the parameters required for displaying the images in the future according to the virtual layout  700 . 
       FIG. 8  is a schematic view of a display image according to an embodiment of the disclosure. 
     With reference to  FIG. 8 , when there is a demand for displaying a display image on the display wall  300 , the image management device  200  divides the display image into a plurality of divided images P 0  to P 3  according to the virtual layout  700 , wherein the divided image P 0  on the upper-left corner corresponds to the upper-left display with the display identification number  0000 , the divided image P 1  on the upper-right corner corresponds to the upper-right display with the display identification number  0001 , the divided image P 2  on the lower-left corner corresponds to the lower-left display with the display identification number  0002 , and the divided image P 3  on the lower-right corner corresponds to the lower-right display with the display identification number  0003 . The image management device  200  then respectively inputs the divided images P 0  to P 3  into the corresponding displays. Thereby, as shown in  FIG. 8 , the four displays on the display wall  300  can respectively display the corresponding divided images P 0  to P 3 , so as to stitch the divided images P 0  to P 3  and display the complete display image. 
     To sum up, in the layout identification method of the display wall and the electronic device and the display system using said method according to one or more embodiments of the disclosure, after the electronic device capable of taking pictures and doing calculations is applied to obtain the display wall image, the display wall image is identified to obtain the virtual layout of the displays on the display wall, and the virtual layout is then provided to the image management device of the displays. As such, no matter how the actual arrangement of the displays on the display wall is changed, the virtual layout of the simulated display wall can be generated with ease in an accurate and rapid manner, so as to allow the displays on the display wall to correspondingly display the image according to the virtual layout. 
     Although the disclosure has been disclosed by the above embodiments, the embodiments are not intended to limit the disclosure. It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the disclosure without departing from the scope or spirit of the disclosure. Therefore, the protecting range of the disclosure falls in the appended claims.