On February 22nd, the video display screen of the conference hall of the Jinan Municipal Government of Shandong Province used the Multi CHIPLED LED of Osram Opto Semiconductors as the light source. These LEDs were chosen thanks to their high brightness, high contrast and advanced structure. They are available in a black package that is unaffected by ambient light, and their tight-pitch design for homogeneous video display and high color fidelity.
Multi CHIPLED has the darkest LED package on the market and is sealed with a diffused resin, so it has better contrast performance, making the screen whiter and blacker, and the black and white contrast is sharper. There are three chips in each Multi CHIPLED LED (red recording blue), each of which can be driven separately to mix any color needed to meet the needs of video display.
Zhou Jingbo, general manager of New Spectrum Technology Co., Ltd. pointed out: "In the conference room, we usually need to demonstrate video in a bright background. Before that, we have never seen it in ambient lighting applications. High image quality and high contrast. In addition, due to the uniform display across the entire viewing angle, our audience can clearly watch the video anywhere in the conference room."
These innovations in LED technology are bound to drive the rapid development of the LED video display market. LED video displays are being installed in more and more places, from conference rooms to gyms, from store facade lighting to outdoor billboards.
Die casting is the pressure of metal molds on a die casting machine and is the most productive casting process. Die-casting machines are divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. The hot chamber die casting machine has a high degree of automation, less material loss, and higher production efficiency than the cold chamber die casting machine. The aluminum alloy die castings that are widely used today can only be produced on cold chamber die casting machines due to their high melting point. The main feature of die casting is that the molten metal fills the cavity under high pressure and high speed, and is formed and solidified under high pressure. The air in the cavity is wrapped inside the casting to form subcutaneous pores, so aluminum alloy die castings should not be heat treated, and zinc alloy die castings should not be sprayed on the surface (but can be painted). Otherwise, the internal pores of the casting will expand due to thermal expansion and cause the casting to deform or bubble when the above-mentioned treatment is performed. In addition, the mechanical cutting allowance of die castings should also be smaller, generally around 0.5mm, which can not only reduce the weight of castings, reduce the amount of cutting to reduce costs, but also avoid penetrating the surface dense layer and exposing subcutaneous pores, causing The workpiece is scrapped.
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