The production of small spacing LED screens involves those technical processes

　　1. Encapsulation technology:

　　Small spacing led display screens with density below P2 generally adopt 0606, 1010, 1515, 2020, 3528 lights, and LED pin shape adopts J or L packaging mode. Welding pins side to side, there will be reflective welding area, poor ink effect, inevitably need to add a mask to improve contrast. If the density is further increased, the packaging of L or J cannot meet the application requirements, so QFN packaging must be adopted. This process is characterized by no lateral welding pins, welding area without reflection, so that the color effect is very good. In addition, the all-black integrated design is molded, the contrast of the screen is increased by 50%, and the display quality is more excellent than the previous display screen.

　　Small spacing led display

　　2. Mounting technology:

　　The slight deviation of the position of each RGB component in the micro-spacing display will lead to the uneven display of the screen body, which is bound to require the mounting device to have higher accuracy.

　　3. Welding process:

　　If the temperature rise of reflow welding is too fast, the wetting imbalance will be caused and the device will be offset in the wetting imbalance process. Excessive wind cycles can also cause device displacements. Try to select the reflow welding machine above 12 temperature zone, chain speed, temperature rise, circulating wind, etc. as strict control projects, not only to meet the welding reliability requirements, but also to reduce or avoid the shift of the device, as far as possible to control the demand range. Generally, 2% of the pixel spacing is used as the control value.

　　4, printed circuit board process:

　　With development trend of micro space display, 4 layer and 6 layer board, printed circuit board using micro hole and buried hole design, printed circuit graphics fine wires, micro Kong Hua narrow spacing, used for the processing way of mechanical drilling technology can not meet the requirements, the rapid development of laser drilling technology will meet the micro hole machining.

　　5. Printing technology:

　　The CORRECT PCB PAD design needs to be implemented in the design after communication with the manufacturer. The opening size of the screen and the correct printing parameters are directly related to the amount of solder paste printed. Generally, 0.1-0.12mm thickness of electric polishing laser steel mesh is used for 2020RGB devices, and 1.0-0.8 thickness is recommended for 1010RGB devices below. The thickness and opening size increase in proportion to the amount of tin. The quality of micro-spacing LED welding is closely related to solder paste printing, and the use of printing machines with features such as thickness detection and SPC analysis will play an important role in reliability.

　　6, screen body assembly:

　　The assembled box can display fine pictures and videos only after it is assembled into a screen body. However, the size tolerance of the box itself and the cumulative tolerance of assembly can not be ignored for the effect of micro-spacing display assembly. If the pixel spacing of the nearest device between boxes is too large or too small, dark lines and bright lines will be displayed. Dark line, bright line problem is now micro - spacing display can not be ignored, need to solve the problem. Some companies apply 3m tape and fine-adjust nuts to the box to achieve the best results.

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