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gan led production in two ways: the gold - gold hot tin eutectic bonding, and gold. in gold - gold hot bonding process, a layer of 1 to 3 micron thick gold bonding layer barrier is painted on each wafer. in order to eliminate surface contamination of solid-state diffusion mechanism, the need for cleaning steps (uv ozone or chemical wet processing). when bonding temperature is 250 ° -400 °, the pressure is 1 to 7mpa, from minutes to hours. increase the time required temperature and pressure. if not enough time and pressure, usually between the wafer and wafer with only partial.led message sign
this can replace the high-brightness led production is still incandescent and a variety of fluorescent lamps. high brightness led's a significant advantage is that its life is measured in decades. a variety of high-brightness led emission of photons in all directions, including under the direction of the substrate. if the substrate area than the small led light band gap, the substrate will absorb about half of the reflected light, which greatly reduces the light output. if a wafer with light-emitting diode bonded to a surface with high reflectivity of the wafer substrate, still able to heat the wafer substrate, fired at the substrate and the light will be reflected back through the emitter.which greatly increase the total light output. many materials, such as silicon, gallium arsenide, gallium nitride, gallium phosphide, sapphire, etc., and can be used to produce led. in the compound semiconductor layer grown on a photon and transfer to the silicon or similar materials on the wafer support, and the back of the wafer is exposed. now only the big compound semiconductor to 4 inches.led neon sign
2, the full hd signal display with hd-sdi, dvi and other broadcast-quality video transmission signal as an input a signal, greatly increasing the signal resolution, compared to the same industry have a greater advantage, and the mainstream of the video signal interface is consistent. 3, the powerful image processing technology uses the top graphics processing engine, to meet the requirements of broadcast video processing, can achieve non-standard formats, image size adjustable orientation, 36bit image processing technology, 24bit true color .business neon sign