1、LED的发展与应用 毕业论文外文翻译The development and application of LEDAs the further development of display device and technology, screen display system has been widely used in national economy, LED display as a carrier for displaying information is one of major media. LED display is composed by using LED lattice
2、 module or pixel unit. As computer technology developed, LED digital has the characteristics of high reliability, long life, high cost performance, low using cost, strongly adaptive capacity to environment which can be directly driven without reducing drive, therefore, it has been playing a importan
3、ce role in the field of flat display. and for a long period of time, there are considerable room for development. So, it widely used in the financial markets, hospitals, stadiums, airports, terminals, stations, highways and other public places for information display and advertising.First LED Summar
4、y LED (Light Emitting Diode), light-emitting diode, is a solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart of a semiconductor chip, the chip is attached to one end of a stent, is the negative side, the other end of the power of the cathode
5、, the entire chip package to be epoxy resin. Semiconductor chip is composed of two parts, part of the P-type semiconductor, it inside the hole-dominated, the other side is the N-type semiconductor, here is mainly electronic. But linking the two semiconductors, among them the formation of a PN juncti
6、on. When the current through the wires role in this chip, will be pushing e-P, P zone in the hole with electronic composite, and then to be issued in the form of photon energy, and this is the principle of LED luminescence. The wavelength of light that is the color of light, is formed by the PN junc
7、tion of the decisions of the material.Second LED developmentThe development of LED display can be divided into the following phases: first phase 1990 to 1995, mainly monochrome and 16 color graphics screen. Used to display text and simple images, mainly used in railway stations, financial securities
8、, banks, post offices and other public places, as public information display tools. The second stage is from 1995 to 1999, there have been 64, 256 level gray-scale two-color video screen. Video control technology, image processing, optical fiber communication technology applications will enhance the
9、 LED display to a new level. LED display control LSI chips special at this time developed by domestic companies, and can be applied. The third stage, from 1999, red, pure green, blue LED in bulk into China, while domestic enterprises in-depth research and development work, using red, green, and blue
10、 LED production of full-color display has been widely used , poured into sports stadiums, convention centers, squares and other public places, which will bring the domestic large-screen full-color era. Third LED advantagesConductor light-emitting diode (LED) as a third-generation semiconductor light
11、ing source. This fantastic product has a lot of advantages: (1) efficient light: spectra of almost all concentrated in the visible light frequency, the efficiency can reach 80% -90%. The luminous efficiency of incandescent visible light efficiency of almost 10% -20% only. (2) high quality of light:
12、not as a result of spectrum UV and infrared, there is no heat, no radiation, is typically a green light illumination. (3) energy consumption of the small: single power generally 0.05-1w, through the cluster can be tailored to meet different needs, and waste very little. As a light source, under the
13、brightness in the same power consumption of only ordinary incandescent 1/8-10. (4) long life: flux attenuation to 70% of the standard life expectancy is 100,000 hours. A semiconductor light can be used under normal circumstances 50 years, even if the long life of the people, life will be used up to
14、two lights. (5) durable and reliable: No tungsten wire, glass and other easily damaged components, non-normal retirement rate is very small, very low maintenance costs. (6) the application of flexibility: small size, can flat pack, easy to develop into a short thin products, make point, line, face v
15、arious forms of specific applications. (7) Security: working voltage 1.5-5v or less in between the current 20-70mA in between. (8) green: recyclable waste, no pollution, unlike fluorescent lamps containing mercury as ingredients. (9) response time is short: to adapt to frequent and high-frequency sw
16、itching operation of occasions. In recent years, Chinas LED display related technology has also been made a fast and great development, Because of early stage LED material and component restriction, LED display applications were not widely expand. The other hand, display control technology basically
17、 is a communication control method which objectively affects the display effect. Thus resulting in the early LED displays in the country rarely, product based on double primary color which is green and red, communication control, gray level is single point of four tone gray, high cost. Later, the ra
18、pid development of LED display in the nineties, the global information industry is growing rapidly, information technology continue to make breakthroughs in various fields, LED display in the LED materials and control technology has also been the emergence of new results. The successful development
19、of blue LED lens, full-color LED display to enter the market; the field of computer and microelectronics technology development in the field of display control technology, the video control technology, the screen dynamic display effect of greatly increased. In this stage, LED display in China has de
20、veloped rapidly, LED display industry turn into a new high-tech industry. Today, LED display used in broader field, here I will talk my point about the LED in the hotel and leisure field applications.I. LED display of the effectiveness of the hotelLED electronic display is the fourth largest adverti
21、sing media after television，newspaper, network. It will bring tangible social benefits for investors and economic benefits, LED electronic display can be received from the computer, TV, VCR, VCD, video cameras and other information transmitted, and play dimensional or three-dimensional animation, te
22、xt information at anytime.With economic grows, Accelerated pace of social work life, the hotel in peoples lives plays a indispensable role. Hotel is a large population flow in today where it is a social gathering place for celebrities, of course, it is the window which needs information fastest, mos
23、t accurate and huge. LED electronic display will be full of your customers demand for investors with a huge, immeasurable, long-term social and economic benefits.1. SocialA, promote the hotels services and preferential policies to enhance the hotels image.B, promote the hotels service commitment and
24、 other content, enhancing its visibility.C, beautify the hotel environment, to improve their grades and the taste is more conducive to attracting more customers a friend.D, Providing convenience to our customers.2. EconomicThe twenty-first century, a highly information-oriented era, corporate awaren
25、ess of the advertisements has never been so strong and is growing; Hotels flow-intensive, information requirements wide; LED electronic display, a high information content of the display medium, a the worlds best advertising media, can be, within 365 days a year to undertake a variety of advertising
26、 an unlimited number of foreign business; In good operation, will obviously about to create rising prosperity has brought enormous economic benefits. Guangzhou, China Trade Fair Exhibition Hall next to a large full-color screen, at an annual tens of millions of dollars in advertising revenue for inv
27、estors rolling in wealth; Xiamen Egret Plaza on the state of large-scale full-color, in just three years time, the recovery of more than 500 million yuan of total investment, and is nearly 200 million a year net profit for the investors steady flow of economic benefits.The foregoing analysis, the Gr
28、and Hotel to configure a large LED electronic display, will give you and your guests with huge, long-term, good social and economic benefits, play a double-edged sword effect.The role of hotel LED display1.Heat the hotel mood.Through the display screen to play the higher-ups and all kinds of guests
29、come to visit, guide words of welcome, a variety of major festivals such as celebration of the word.2.Knowledge spreadingA, through the LED electronic display that can play a variety of laws, rules, regulations and all kinds of knowledge and so on.B, through the LED electronic display can play hotel
30、 new service introduction; the hotels service commitment and so on.3. Play the role of bulletin boards.Through the display screen can be broadcast lectures, meetings of the notice, all notices, job placement and advanced individuals, the Hall of Fame and advanced deeds and so on.4.played the role of
31、 public service ads., through the display screen can be broadcast weather forecasts;, local culture, history, geography, climate profiles, local customs and habits;, local maps, tourist traffic map and various tourist spots, maps;, civilized citizens of the Convention, the hotels slogan and importan
32、t news.5. Creation of well economic benefits As the worlds best advertising media, also carry advertisements of major companies, (the proposed dual-color or full color, so that the content displayed on the rich and colorful, more attraction to major companies and units undertake activities and doing advertising, enhance the hotel to be well known, fully reflect the grade of the hotel).Overall LED display in the hotel for the advancement of hotel services to the public image, reputation, service grade, and create a civilized window. The characteristics of LED display1. Display is of bri
