Shanxi high-tech Huaye Electronic Group
with the needs of the economy and the rapid development of micro distance full color LED display technology and mature, LED display point distance is more and more small, micro distance now bazaar has now launched P1. 4,P1。 2,P0。 9 micro distance, such as , and widely in the center of the video conference, command and control, monitoring, radio and television media category. During the past few years, the distance of the hd display, high frequency of rewriting, seamless splicing, excellent heat dissipation system, convenient tear open outfit, energy conservation, environmental protection and other features have been known to many enterprise users, technically, the micro distance is smaller on the screen pixel distance of SMT, assembly, the higher the splicing process and structure of the request. Below by photoelectric technology personnel to introduce
1, encapsulation technology:
P2 is generally selected density of the display screen above 1515, 2020, 3528, lamp, LED tube feet J or L shape encapsulation method. Lateral welding pin, welding area will be reflective, inky effect is poor, will demand more than the expansion of masks and intensity of illumination. Density, further or J L package cannot be satisfied using demand, it is necessary to choose QFN package method. The process feature is no lateral welding pin, welding area without a glance, and then make the color effect is very good. Other choose picture of mould pressing, all black integration planning progress than the intensity of illumination by 50%, according to using the display quality role in ever more.
2, welding process:
reflow soldering temperature is too high will lead to moisture imbalance, process equipment in wet imbalance will lead to deviation. Too much wind circulation will also form equipment displacement. Try to select more than 12 zones reflow welding machine, chain as well as wind speed, temperature, cycle as a strict control project, including welding strong sexual satisfaction will demand, and to cut may prevent the migration of equipment, as far as possible manipulation in the demand scale. 2% of the distance size in pixels as a general control values.
3, box installation:
enclosure has the different modules patchwork, enclosure of the gaps between the direct relationship between the roughness and module box body after installation of all the work. Aluminum plate processing box, aluminum box is widely used type of enclosure, roughness can reach 10 silk. Splicing gap between modules with two modules recently pixels, comparing the distance is too close to two pixels after light bright line, two pixels far would result in a darker skin. Before the assembly requirements in terms of measurement to calculate the mold spellers seam, and then selects the relative thickness of the sheet metal as a fixture in advance in assembling.
4, the screen body assembly:
installed after the end of the housing demand ChengBing assembly body talent show fine enough pictures and video. But the case itself scale public servants and assembly cumulative public servants effect on micro distance display assembly can afford to neglect. Recent equipment pixel distance between casing and casing is too large, starts to lead to show dark lines, bright line. Dark lines, bright line distance micro display now, demand for hogging problem that nots allow to ignore. Part of the company through the paste 3 m tape, boxes fine adjusting nut adjustment, in order to reach the best effect.
5, printed circuit board technology:
with development trend of micro distance display, 4 layer and 6 layer board was selected, printed circuit board will choose micro hole and buried via planning, graphics printed circuit conductor is fine, micro Kong Hua narrow range, processing of the chosen method of mechanical drilling techniques can not satisfied requirements, agile development techniques will be satisfied with the laser drilling a hole machining.
6, printing technology:
too little and too much of the amount of solder paste and offset printing directly affect the welding quality of micro distance display tubes. The correct PCB solder after planning needs to communicate with factory to plan, mesh opening intrusive and printing parameters are correct or not directly related to the amount of solder paste printing. 2020 RGB equipment chosen commonly 0. 1 - 0. 12 mm thickness of electrolytic polishing laser steel net, below 1010 RGB equipment selection 1. 0 - 0. 8 the thickness of the steel mesh. Thickness, intrusive and additive amount of tin into share. Micro distance LED welding quality is so intertwined with solder paste printing, to detect the thickness of the belt, the SPC analysis functions such as the use of the printing press will have an important meaning for strong sex.
7, SMT technology:
micro fine migration distance display the RGB equipment azimuth will result in uneven screen display, inevitable requirement SMT equipment has a higher precision.
8, system card selected:
micro distance display lines and uniformity of light and shade, color difference is LED equipment, IC current differences, the difference of circuit layout, assemblages of the difference of the installation, some correcting system card company through software can cut lines and uneven luminance and chrominance light and shade. Card, choose high performance system for micro distance brightness, chroma, makes the screen to reach better brightness and chroma uniformity, good display effect were obtained.
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