點(diǎn)陣led外文翻譯---基于at89c52的led概述-展示頁(yè)
2025-05-26 21:34本頁(yè)面
【正文】 iode (LED) acronym, and its basic structure is an electroluminescent semiconductor materials, placed in a wire rack, then sealed with epoxy resin around, that is, solid package, Therefore, the protection of the internal batteries can play the role of line, so the seismic performance LED good. LED is the core of the Ptype semiconductor and ponents of the Ntype semiconductor chips, the Ptype semiconductor and Ntype semiconductor between a transition layer, called the PN junction. In some semiconductor materials in the PN junction, the injection of a small number of carriercarrier and the majority of the extra time will be in the form of light energy to release, thus the power to direct conversion of solar energy. PN junction on reverse voltage, a few hardcarrier injection, it is not luminous. This use of injection electroluminescent diodes is produced by the principle of lightemitting diodes, monly known as LED. When it in a positive state of the work (that is, at both ends with forward voltage), the current flows from the LED anode, cathode, semiconductor crystals on the issue from the ultraviolet to infrared light of different colors, light and the strength of the currents. Instruments used for the first LED light source instructions, but all kinds of light colored LED lights in traffic and large screen has been widely applied, have a very good economic and social benefits. The 12inch red traffic lights as an example, is used in the United States have long life, lowefficiency 140 watt incandescent lamp as a light source, it produced 2,000 lumens of white light. The red filter, the loss90 percent, only 200 lumens of red light. In the light of the new design, Lumileds panies have 18 red LED light source, including the loss of circuit, a total power consumption of 14 watts to generate the same optical effect. Automotive LED lights is also the source of important areas. 沈陽(yáng)工程學(xué)院畢業(yè)設(shè)計(jì)（論文） 2 For general lighting, people need more white light sources. The 1998 white LED successful development. This is the GaN LED chip and Yttrium Aluminum Gar (YAG) package together cause. GaN chip of the Bluray (λ p = 465nm, Wd = 30nm), made of hightemperature sintering of the Ce3 + YAG phosphors excited by this Bluray after irradiating a yellow, the peak 550 nm. Bluechip installed in the LEDbased Wanxing reflection in the cavity, covered with a resin mixed with YAG thin layer, about 200500 nm. LEDbased tablets issued by the Bluray absorption part of the phosphor, the phosphor another part of the Bluray and a yellow light mixed, can be a white. Now, the InGaN / YAG white LED, YAG phosphor by changing the chemical position of the phosphor layer and adjust the thickness of the 350010000 K color temperature can be colored white. This blue LED through the method by white, constructed simple, lowcost, high technology is mature, so use the most. In the 1960s, the use of science and technology workers semiconductor PN junction of The principle of developing a LED lightemitting diodes. At that time, the development of LED, the materials used are GaASP, its luminous color is red. After nearly 30 years of development, and now we are very familiar with the LED, has been sent to red, orange, yellow, green, blue, and other shade. However lighting necessary for white LED light only in recent years to develop, readers here to tell us about lighting with white LED. The LED display screen and video display into the text by LED matrix blocks. Graphic display can be displayed with puter, English, Chinese text and graphics, Video screen using microputer control, graphic, image, with realtime, synchronization, clear information dissemination way play all kinds of information, but also shows 2d, 3d
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