LED of various light colors was widely used in traffic signal lights and large-area display screens, which produced good economic and social benefits. The 12-inch red traffic light, for example, was originally used in the United States as a long-life, low-light-efficiency 140-watt incandescent light source, which produces 2,000 lumens of white light. After passing through the red filter, 90% of the light is lost, leaving only 200 lumens of red light. For general lighting, people need white light source more. In 1989, the white LED was developed successfully. This LED is made of GaN chip and yttrium aluminum garnet (YAG) encapsulated together. GaN chips emit blue light (λ P =465nm, WD =30nm), and the Ce3+ containing YAG phosphor made by sintering at high temperature is excited by the blue light and emits yellow light with a peak value of 550nm.
LED wavelength, the intensity of the light changes, can be described by data called wavelength. The wavelengths of light we can see range from 380 to 780nm. Unit: nanometer. Brightness, brightness refers to the degree of brightness of an object, defined as the intensity of light per unit area. Unit, NIT. LED light intensity refers to the brightness of the light source. That is, the physical quantity of the visible light radiation emitted by the light source in a certain direction and range.
Recently, with the country’s strong advocacy of energy conservation, many household lights are basically replaced by LED energy-saving lamps. After change, the room is really bright many, light bulb touch is not easy to hot, looked at not so dazzling. But the joy didn’t last long. Soon, they discovered that these energy-saving lights didn’t seem to save energy! The new LED lights in my home broke down within a few months, and the electricity bill is higher than ever, which seems to be far from what was advertised when I was shopping.
The Chinese company has teamed up with Optrics to supply more than 430 square meters of small-pitch LED screens to help Al Araby TV build a tech-savvy news studio and interview studio in Qatar’s Lusel New City. Nowadays, sports events and LED display can be regarded as the “best partner”. Under the power of LED display, sports event information can be presented in time; The whole race and highlights can be shown in high definition.
What factors affect the reliability of LED packaging, The quality of LED packaging has a great impact on the quality of LED display. The key of package reliability includes the selection of chip material, packaging material and process control. With the gradual penetration of LED display to the high-end market, the quality requirements for LED display devices are becoming higher and higher. The main material composition of LED display device packaging includes bracket, chip, solid adhesive, bonding line and packaging adhesive.
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Traffic signal lights and large display screen usd LED