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First, count from the height and width of the room.
For example, the reserved area of ​​an indoor display wall is 8.8 meters wide and 3.2 meters high.
First reduce the height of the bottom support by about 1 meter from the height, 3.1 meters - 1 meter = 2.2 meters.
Next, you should select the display size from the display height, 16:9 display specifications, 40-inch height is generally 520~550mm, width is generally 910~950mm, 46-inch is generally 600~630mm, width is generally 1040~1080mm, 4.
According to this basic size, we calculate the number of layers, 40 inches: 2200 ÷ 550 = 4, up to 4 layers, 46 inches: 2200 ÷ 630 ≈ 3.5, take integers, up to 3 layers. Follow us to confirm the display width, 8.8 meters is the net size of the room, the display area should be the middle part, need to subtract the door or decoration width of the two sides at least 3 meters, that is, the width of the actual wall is at most 5.8 meters, which It can be used to calculate the number of displays, 40 inches: 5800 ÷ 950 ≈ 6.1, take integers, up to 6 columns; 46 inches: 5800 ÷ 1080 ≈ 5.4 take integers, up to 5 columns. 
Next, we have to make a choice. Applicable choices for 40 inches: 2×2, 2×3, 2×4, 2×6, 3×2, 3×3, 3×4, 3×6, 4×4, 4×6; 46-inch application Choice: 2 × 2, 2 × 3, 2 × 4, 3 × 2, 3 × 3, 3 × 4, 3 × 5.
If it is a video surveillance large screen full screen display all the way image or command dispatch room high resolution image display, it is recommended to choose the appropriate specifications, generally, 2 × 2, 3 × 3, 4 × 4, because it is 16:9 display Screen, so the general selection principle is the number of columns ≤ the number of rows, otherwise the graphics will be flat and long display.
If it is only a single screen display, there is no combined magnification display, and the stitching scale can be designed according to the maximum size.
In this example, the appropriate wall selection is: 3 × 3, 46 inches; 4 × 4, 40 inches.
The best principle of choosing one is generally to follow the same area, and the large size is preferred. The reason is that the number of large-sized splicing gaps is small, and the overall style is relatively simple.
Another method of selection is to use a large number of display screens on the same plane, which is generally used in situations where the number of video images is monitored.
Demand analysis of display signals and analysis of device selection signals:
Large-screen splicing field color display signals are generally divided into three categories: video, computer, and network.
DID narrow slit LCD splicing display system has a complete video and computer interface, and currently does not have a network interface, therefore, mainly based on video images and computer graphics.
The video interface generally provides: a set of RCA composite audio and video input, a set of YCbCr color difference analog input; the industrial interface uses a BNC card header. Cable specifications are usually 75-3, 75-5, 75-9, general indoor use 75-3: transmission distance is controlled within 100 meters; 75-5: transmission distance is between 100 meters and 300 meters, professional cable : 400-800 meters; 75-9: transmission distance is 300 meters - 300 meters; 800 meters, professional cable: 800-1600 meters; 800 meters - 20 kilometers, with fiber. More than 20 kilometers, fiber + network.
The computer interface generally provides: VGA analog computer input all the way; D-Sub15 pin and RGBHV two main specifications, the wire diameter is generally 75-2, 75-3, 75-5 three. The transmission distance of VGA is 75-2 lines, 20 meters-30 meters, 75-3 lines, 30 meters-50 meters, 75-5 lines 50 meters - 100 meters.
The digital computer interface generally provides: DVI digital video or HDMI digital audio and video input all the way; common specifications are 1.8 meters - 15 meters.
For the advertising media promotion application, the composite video interface will be fixed, or the high-definition player will be configured to use the color difference, DVI, HDMI interface;
For pure video surveillance rooms, only composite video will be used;
For the command and control room and the industrial control center, it will be displayed in a mixture of video and computer;
For the industrial and commercial enterprise office hall or business center, the video signal will be mainly used for business promotion and information release. According to the image display requirements, you can choose to configure high-definition playback equipment.
[ Huaqiang Security Network News ] DID narrow-edge LCD splicing display system mainly has 40-inch and 46-inch specifications. In this way, the theoretical splicing scale comes out: 40 inches, 4 × 6; 46 inches, 3 × 5.