LED transparent screens have been sold in full swing, LED transparent screen manufacturers have also been from the few to the present everywhere, how to judge the LED transparent screen is good or bad? Some people say that through the appearance can roughly judge the quality of the box, is this really? The transparent LED panels produced by many manufacturers are similar, even if the appearance is different, the construction principle is the same, circuit boards, lamp beads, wires and so on. If you use our fire eye to find a good transparent LED display, Xiaobian here is a brief introduction:
Brightness comparison
Hold the acrylic plate close to the same number of modules and slowly increase the distance between the pieces to see if the brightness of the lamp can meet your requirements. Of course, putting the module directly in the word is more direct. The higher the brightness, the higher the requirement for the lamp bead. Chen is also relatively high. Pure indoor environment can use low brightness, but if it is a window LED transparent screen or LED glass curtain wall screen, then it is required to be a bright LED transparent screen.
Uniform light
While watching the brightness, pay attention to whether the light of the lamp is uniform. When observing the white light, be sure to pay attention to whether there is any chromatic aberration (this is very important). If you cover it with a thin piece of white paper, you may not observe it. Use a certain thickness of acrylic. The presence or absence of chromatic aberration is an important part of distinguishing between good and bad quality, and is one of the main reasons for the price difference of LED transparent screens.
Wire identification
High-quality wire, passed UL certification, these are not reliable through the LED transparent screen manufacturer, so the direct method is to open the outer skin, count the number of cores inside! Use 15, 17, 19 core or even 20, 30 core The module of the line should not be worse than the 14 and 11 core modules, and vice versa.
Lamp temperature
After lighting for a period of time, touch the LED lamp beads by hand. The temperature is very high and even the hot hand is definitely not stable with low temperature.
Solder joint quality
The solder joints are full and the soldering process is good. The high brightness proves that the solder is good. The serious one is the solder joint, which is prone to contact failure and subsequent maintenance troubles.
LED transparent screen light method
At present, LED transparent screens are produced in two ways, one is positive illumination and the other is side illumination. Although the side illuminance is relatively high, the lamp bead packaging technology is yet to be tested by the market, and the illuminating lamp bead is the lamp bead of the traditional led display. After the market inspection, the quality is very stable.
Valve Part
Valve part is kind of pipeline fittings, which is used to open and close, control, adjust and control the flow of medium parameters (temperature, pressure and flow). According to its function, it can be divided into the cut-off valve, check valve, regulating valve, etc.
Valve is the control unit in fluid conveying system, having function of cut-off, regulation, guide, to prevent the reverse flow, voltage regulator, the leakage of the shunt or overflow and so on. Valve parts used in fluid flow control system, have quite a wide varieties and specifications, from the most simple cut-off valve to all kinds of valves used in extremely complex automatic control system.
The valve can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium. According to the material, valve part is divided into iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome molybdenum steel valves, molybdenum chrome vanadium steel valve, dual phase steel valves, plastic valves, non-standard custom-made valves, etc.
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