With the demand of the economic market and the rapid progress and maturity of small-pitch touch display
technology, the dot pitch of small-pitch LED displays is getting smaller and smaller. Now the market has introduced P1.4, P1.2, P0.9 and other fine pitches. LED display screens are widely used in video conferencing, command and control, monitoring centers, radio and television media and other fields. In the past few years, the characteristics of fine-pitch LED display screens such as high-definition display, high refresh rate, seamless splicing, good heat dissipation system, convenient and flexible disassembly and assembly, energy saving and environmental protection have been well-known by the majority of industry users. However, take it a step further and say As for the specific process technology of the small-pitch LED display, the general public rarely knows it. They only know one of them and know the other. The lack of professional knowledge directly leads to the emergence of blind spots in the purchase. From a technical perspective, the smaller the pixel pitch of the micro-pitch display, the higher the requirements for the mounting, assembly, and splicing process and structure of the LED display. This article will analyze the various process technologies of the micro-pitch touch display, allowing users to have a more thorough understanding of the micro-pitch LED products. 1. Packaging technology: LED displays with density above P2 generally use lights of 1515, 2020, 3528, and the shape of LED pins uses J or L packaging. When the pins are welded from the side, there will be reflections in the welding area, and the ink color effect is poor. It is bound to increase the mask to improve the contrast. With further increase in density, L or J packaging cannot meet application requirements, and QFN packaging must be used. The characteristic of this process is that there is no lateral welding of the pins, and the welding area is non-reflective, which makes the color rendering effect very good. In addition, it adopts all-black integrated design and compression molding, the contrast of the picture is increased by 50%, and the picture quality of the display application is better than that of the previous display. 2. Soldering process: Excessive temperature rise in reflow soldering will cause uneven wetting, which will inevitably cause the device to shift during the process of wetting imbalance. Excessive wind circulation will also cause displacement of the device. Try to choose reflow soldering machines above 12 temperature zones, chain speed, temperature rise, circulating wind power, etc. as strict control items, that is, to meet the requirements of soldering reliability, but also to reduce or avoid component displacement, and try to control it within the required range. Generally, the range of 2% of the pixel pitch is used as the control value. 3. Cabinet assembly: The LED display cabinet is spliced u200bu200bby different modules. The flatness of the cabinet and the gap between the modules are directly related to the overall effect of the cabinet after assembly. Aluminum plate processing boxes and cast aluminum boxes are currently widely used box types, and the flatness can reach within 10 wires. The splicing gap between the modules is evaluated by the distance between the nearest pixels of the two modules. If the two pixels are too close, they will be bright. Line, two pixels too far will cause dark lines. Before assembling, it is necessary to measure and calculate the seam of the module, and then select the metal sheet of relative thickness as the jig to be inserted in advance for assembling. 4. Screen assembly: The assembled cabinet needs to be assembled into a screen before it can display refined pictures and videos. However, the dimensional tolerance of the box itself and the cumulative tolerance of assembly cannot be ignored for the assembly effect of the micro-pitch LED display. If the pixel pitch of the nearest device between the cabinet and the cabinet is too large or too small, it will cause dark and bright lines to be displayed. The problem of dark and bright lines is a problem that cannot be ignored and needs to be overcome urgently for small-pitch LED displays. Some companies make adjustments by sticking 3m tape and fine-tuning nuts on the box body to achieve the best results. 5. Printed circuit board technology: with the development trend of micro-pitch displays, 4-layer and 6-layer boards are adopted, and the printed circuit board will adopt the design of micro-via and buried holes, and the printed circuit pattern will have fine wires and narrow micro-hole spacing. The mechanical drilling technology used in processing can no longer meet the requirements, and the rapidly developing laser drilling technology will meet the requirements of micro-hole processing. Hand in hand with Jiaqian to achieve a win-win vision, to meet customers' requirements for precision display, high efficiency, energy saving, stable and reliable, and ultimate quality micro-pitch LED display products are the production requirements of micro-pitch LED manufacturers. Only to achieve the control of related raw materials and production technology, small Pitch LED display can bring users a higher-end display effect.
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