led portable lights factory

 The new module led portable lights factory is 6 cm x 10 cm, and the pitch is about 700 µm or less. After a lot of hard work, this year has finally made the red light 'bright'. Micro LED technology has been discussed for many years. Fang Yanxiang explained that the Micro LED chip must first be bonded to a temporary substrate made of silicon or glass during the manufacturing process, and then the sapphire substrate is removed by laser lift-off, and then the original LED structure is flipped in the form of flip chip.

Face down, and make the P-type and N-type electrodes on the same side, which is more difficult for Micro LEDs that are scaled down to the micron level. A slight improper pressure may reduce the success of red light transfer. Under certain power consumption requirements, it is very difficult to reach 100,000 nits. Weakening the structure is a key to the success of mass transfer. In particular, red light is limited by materials and characteristics, and perhaps even a 50% yield may not be achieved. The Mini LED display module of Taiwan Industrial Technology Research Institute adopts PCB substrate,

the module size is 6 cm x 6 cm, the pitch is less than 800 μm, and the resolution is 80 x 80 pixel. Fang Yanxiang, deputy head of the Intelligent Application Microsystem Group of the Institute of Electro-Optics of Taiwan Industrial Technology Research Institute, mentioned two major technical problems. Last year, the passive matrix drive ultra-fine-pitch Micro LED display module developed by Taiwan Industrial Technology Research Institute and the third factory successfully transferred the Micro LED array chip directly to the PCB substrate, but the RGB full-color only lacks red light. Just looking at the yield rate of the available area is not enough.'

Fang Yanxiang took a 4-inch LED wafer as an example and pointed out that after the wafer has an outer diameter of 2 mm, the yield of the usable area is It may reach 99% under a single standard value, that is, just look at the wavelength (Dominant Wavelength, Wd), the driving voltage (Forward Voltage, Vf) or the reverse leakage

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