In today's society, under the circumstance of rapid development, outdoor LED large screen will be more and more widely used, but the quality is uneven, leading to frequent accidents, then how can we judge the quality of outdoor LED? Now let's take a look at what's going on in the industry.
In the LED display, the most important is the LED lamp bead, the quality of the lamp bead is affecting the LED display quality. LED lamp bead is the key device with the largest number of use in the whole color screen machine, each square meter will use thousands to tens of thousands of lamp bead, lamp bead is also the main body of determining the whole screen optical display performance, directly affecting the audience's evaluation of the display screen, the lamp bead in the overall cost of the display screen is the largest, ranging from 30% to 70%. The importance was immediately apparent.
In the field of LED display, the most important index is brightness. Under the high requirement of brightness, heat dissipation will become a big problem. Heat dissipation is a relatively long problem in the field of LED, no matter it is lighting or display. Major manufacturers have launched their own heat dissipation solutions, declaration of their products heat dissipation effect has become a hard index. Another reason is that with the development of small spacing LED, the junction temperature problem has always been difficult to solve.
So how to identify the pros and cons of LED display beads?
One: look at brightness, which is how much LM(lumen) your bead can achieve, and LM(lumen) is the unit that measures the brightness of the bead
The 2nd: see give off light whether uniform color is consistent, the lamp bead with good quality gives off light very even, color is consistent. The lamp bead with poor quality can appear a lamp bead brightness is bright, a lamp bead is dark phenomenon, luminous color is at random not unified, can have apparent dark area.
The 3rd: see chip and chip size, chip is the decisive factor that lamp bead quality stands or falls, the chip is bigger stability is stronger normally, brightness is taller, come loose is better.
The 4th: see glue and phosphor powder, general good product can use entrance glue, encapsulate the lamp bead that had been pressed with the hand not be out of shape, the glue with low quality is pressed can appear be out of shape even the phenomenon such as craze.
Fifth: look at the bracket, generally speaking, the bracket is silver-plated red copper bracket, the advantage of silver-plated red copper bracket is fast heat dissipation, can better heat dissipation to lamp beads, small resistance. Some merchants in the market will use ceramic stent to replace the silver copper stent, ceramic stent thermal conductivity is very good
Sixth: look at the packaging process, good quality LED beads uniform color, good gel consistency. This is inseparable from good machinery and equipment, production machinery and equipment is a very key factor, good equipment can ensure the stability and consistency of products in each process, to ensure the product yield.
In fact, the most important, or see the lamp bead chip, chip directly decided the color index, brightness, anti - attenuation degree.
LED display chip in the case of high junction temperature, light decay will be very serious, the first contact body of heat is the substrate, the thermal conductivity of the substrate will directly determine the junction temperature situation, at present, some have begun to use new ceramic as the substrate material.