Splicing scheme for large LED display
First, use the send card cascade to complete the project. In this way, the load-carrying area of ​​the send card cascade can only be limited to the maximum output range of a single LED video processor.
Second, use the splicer to complete the project. In this way, most people will feel that the cost is too high and the operation is complicated. Because the current splicer is mainly designed for the LCD screen splicing market, if it is applied in the splicing project of the LED display, no matter the price or function.
So, is there a low-cost, good-effect, and no-load area limitation scheme? The answer is yes. In the following, the author will introduce such a scheme, that is, the splicing of the large LED display by the LED video processor.
LED video processor, as part of the LED display system, has been well known. His main function is to convert different types of signal sources into video formats that can be accepted by LED displays. In many applications, Use to. If the video processor has built-in multi-screen splicing function, it can be used alone, drive a single LED display, and can be used in combination, and the LED display it carries is regarded as the whole large LED display. In part, some of the screens are displayed, so that the goal of low cost is not achieved. The block diagram of the entire solution is as follows:
At present, the LED video processor on the market also has a splicing function, but the function is simple and the operation is complicated. This is mainly because there are two problems that cannot be solved very well:
First, it is not convenient to calculate the stitching seam of each part of the LED display.
Second, after successfully calculating the stitching seam, the still image is displayed normally, but when the moving picture is encountered, the image splitting will occur at the stitching seam position, which seriously affects the overall sense of the screen.
It is for these two reasons that the LED video processor is not very good when it is being stitched.
The LED video processor provides two splicing methods, namely "equal splicing" and "unequal splicing". The “equal splicing†function is applicable to the application environment where the horizontal and vertical points of the LED display on each video processor are completely the same; the “unequal splicing†function is applicable to the LEDs carried by each video processor. The application environment where the horizontal and vertical points of the display are inconsistent.
These two functional parameters are very simple, easy to operate, intelligently cut and combine image signals according to the user's needs, and ensure seamless connection between the screen and the screen, each frame of the video signal is completely synchronized.
Introduction to the splicing function:
In the "equal splicing" state, only need to adjust 3 parameters, you can complete the splicing function of the LED screen:
I. Stitching position: Select the display position of the current video processor in the entire stitched image. As shown in Fig. 2, the minimum value is 1 and the maximum value is 64.
Second, horizontal splicing: When halving is selected, the total number of horizontal video processors, the minimum value is 1, and the maximum value is 8.
Third, vertical stitching: When selecting halving, the total number of vertical video processors, the minimum value is 1, the maximum value is 8.
The unequal splicing function is introduced:
In the unequal splicing state, it is necessary to adjust six parameters to complete the entire LED screen splicing setting;
First, the total number of points: When performing unequal splicing, the actual number of physical points of the LED display in the horizontal direction.
Second, the total number of vertical points: When performing unequal splicing, the physical number of physical LED display in the vertical direction.
Third, the horizontal start: When the unequal splicing, the horizontal starting position of the display area controlled by the video processor, with the upper left corner of the LED display as the origin (horizontal start 0).
4. Vertical start: When unequal splicing is performed, the vertical starting position of the display area controlled by the video processor takes the upper left corner of the LED display as the origin (vertical start 0).
V. Area Width: The number of display points of the display area controlled by the video processor in the horizontal direction.
6. Area height: The number of display points of the display area controlled by the video processor in the vertical direction. 
Example: The unequal splicing project shown in the above figure (2880×960), we can use three LED video processors to achieve
The maximum driving point is 24,576 × 24,576 LED screen. If the screen of P6 is taken as an example, the LED display area of ​​148 × 148 meters can be supported at most, and the splicing setting of the large LED display can be conveniently completed. The debugging time can be greatly saved in the field, which can be said to be simple and practical. Reliable, low cost LED display splicing solution.
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