Film distance LED screen technology analysis
With the demand of the economic market and the rapid progress and maturity of the mike -spacing LED display technology, the spacing of the spacing LED display screen is getting smaller and smaller. Now the market has launched a micro -spatial spatial LED such as P0.9, P1.2, P1.4 Display screens are widely used in areas such as video conferences, command regulation, monitoring centers, and radio and television media. Over the past few years, the characteristics of high -definition display, high refreshing frequency, seamless stitching, good heat dissipation system, disassembly and flexibility, energy saving and environmental protection of the high -definition display of the micro -spacing LED display have been well known by the majority of industry users, but further, to say, to say, to say At the specific process technology of the micro -spacing LED screen, the general public rarely knows that "only knows one, unknown and the other", and the lack of professional knowledge directly leads to the emergence of blind spots.
From a technical perspective, the smaller the pixel spacing of the macro -spacing display screen, the higher the requirements of the LED stickers, assembly, splicing processes and structures. This article will analyze the various process technologies of the macro -spacing LED display, allowing users to understand the micro -spacing LED products more thoroughly.
1. Packaging technology:
Displays with density above P2 generally use lamps of 1515, 2020, and 3528, and the LED tube feet are used in J or L packaging. In the side of the welding tube, the welding area will have reflection, and the ink color effect is poor, which must increase the mask to increase the contrast. The density is further improved, and the packaging of L or J cannot meet the application needs, and the QFN packaging method must be adopted. The characteristic of this process is the unparalleled welding tube foot, and the welding area has no reflection, which makes the color rendering effect very good. In addition, the all -black integrated design mold molding is used, and the picture contrast is increased by 50 %. The display quality effect is better than the previous display.
2. Print circuit board process:
With the development trend of the micro -spacing display, the 4th and 6 -layer boards are adopted. The printing circuit board will adopt micro -excessive perforated and buried hole design. The mechanical drilling process technology can no longer meet the requirements, and the rapidly developing laser drilling technology will meet the fine pores.
3. Printing technology:
Excessive, too small tin paste and the offset of printing directly affect the welding quality of the micro -spacing display lamp. The correct PCB pad design needs to be implemented in the design after communicating with the manufacturer. The opening size and printing parameters of the mesh board are directly related to the amount of tiny paste. Generally, 2020RGB devices use 0.1-0.12mm thickness of electrical polishing laser mesh. Steel meshs of 1.0-0.8 thickness below 1010RGB are recommended. The thickness and opening size increase proportional to the tin volume. The welding quality of the microbucting LED is closely related to the printing of the tin paste. The use of functional printing machines such as thickness detection and SPC analysis will be of important significance to reliability.
4. Paste technology:
The subtle offset of each RGB device position of the micro -spacing display will cause the screen body to display unevenness, and it is bound to be required to have higher accuracy.
5. Welding process:
Returning to the return welding temperature will cause uneven wetness, which will inevitably cause devices to cause offset during wet imbalance. Excessive wind circulation also causes the device to displacement. Try to choose a return welding machine above 12 temperature areas, chain speed, temperature rise, circulating wind force, etc. as strict control and control projects, that is, to meet the demand for welding reliability, and reduce or avoid the shift of the device, and control it within the scope of demand. Generally, the pixel spacing range is 2 % as the control value.
6. Box assembly:
The box is stitched by different modules. The flatness of the box and the gap between the module directly related to the overall effect of the box assembly. Aluminum plate processing box and aluminum box are currently widely used box types, and the flatness can reach 10 silk. The gap between the splicing gap between the modules is evaluated with the gap between the two modules recently. The two pixels are too close to the bright line, and the two pixels are too far away to cause the dark line. Before assembling, measure the module seam, and then use a relatively thick metal piece as a properly inserted into the assembly.
7, screen body assembly:
The complete box of the assembly needs to be assembled as a screen body before displaying refined pictures and videos. However, the size tolerance and assembly accumulation of the box itself cannot be ignored for the assembly effect of the micro -spacing display. The pixel spacing of the nearest device between the box and the box is too large, and too small will cause the dark line and bright line. The dark line and the bright line problem is a problem that is not neglected on the mobile spacing display and needs to be overwhelmed. Some companies have adjusted the nuts by applying 3M tapes and boxes to the box to achieve the best results.
8. System card selection:
The pitch display screen bright line and uniformity, and the color difference are the accumulation of LED device differences, IC current differences, circuit design layout differences, and assembly differences. all. The high -performance system card is selected to correct the brightness and color of the macro -spacing LED display, so that the display screen can achieve better brightness and color uniformity, and achieve a good display effect.
