【 Knowledge 】 Outdoor LED display quality judgment

by:Xinyao LCD     2020-03-25
Today's society, under the condition of rapid development, outdoor LED will be more and more widely used, but the quality is uneven, leading to frequent accidents, then how we are going to judge the stand or fall of outdoor LED? The next powerful giant colour with a common look at is how to say in the industry. In the LED display, the most important thing is the LED lamp bead, the stand or fall of lamp bead is affecting the quality of LED display. LED lamp bead is spoken by the largest number of the key device in the full color machine, every square metre can use only a few thousand to tens of thousands of lights, lamp bead is to determine the main body of the whole screen optical display performance, a direct impact on the audience evaluation for display, light bead on the screen as a proportion of the overall cost is also the biggest, ranging from 30% to 70%. Importance is highlighted immediately. In the field of LED display, one of the most important index is brightness, under the high requirements for brightness, heat will become a big problem, heat dissipation is field both lighting and LED display is a relatively old problem. The major manufacturers have launched their own cooling solution, the declaration of their products heat dissipation effect has become a tough. Also one reason is that with LED the development of the small spacing, junction temperature is always difficult to solve. So how do you identify LED display lights, advantages and disadvantages? First: see brightness, it is usually what people are calling your lamp bead can achieve how many LM ( Lumens) ,LM( Lumens) Is the unit of measure of lamp bead brightness the second: whether light-emitting uniform color are consistent, the quality of a good lamp bead light is even, the same color. The poor quality of lamp bead will appear a light bead brightness on a lamp bead dark phenomenon, emitting light colors in a mess, there will be obvious dark space. Third: look and chip size, chip and the decisive factors of the quality of lamp bead, usually chip stable sex is stronger, the greater the intensity, the higher the heat dissipation is better. Fourth: see glue and phosphor, generally good product will use imported glue, sealed the lamp bead hand press deformation, low quality of the glue one click will appear the phenomenon such as deformation and cracking. Fifth: see stents, stent for silver plated copper stent, the advantage of the silver-plated copper stent is heat faster, can better to lights, heat dissipation, resistance is small. Some businesses will be on the market instead of silver-plated copper with a ceramic support bracket, bracket of ceramic thermal conductive performance is very excellent sixth: see encapsulation technology, good quality LED lamp bead color uniform, gel consistency. It is inseparable from good machinery and equipment, the production of machinery and equipment is a key factor, good equipment can guarantee the stability of the product on each program and consistency, the yield of security products. Actually the most important, or see the light bead chip, chip directly determines the color rendering index, brightness, degree of decay resistance. LED display chip in the case of high junction temperature, light failure will be very serious, the first contact with body heat is the substrate, the substrate will directly determine junction temperature of thermal conductivity, there are some have begun to use the new ceramic as the substrate material.
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