How about LED electronic display?
Author:Liu Qiong Time:2021-09-12 14:39 Browse(230)
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How about LED electronic display?

In 1968, China's first batch of light-emitting diodes began to enter the market. It has been more than 30 years since then. They have great influence in the emerging optical and optoelectronic industry and have always occupied a place in the field of display technology. In the development of basic electronic products, our government adheres to the concept of big market and takes the modernization and informatization of national economy as the goal, LED industry is the focus in the development of optoelectronic devices. It has advantages in output value, output and scale effect. Although it occupies a small share in the world optoelectronic design, China's huge market potential makes manufacturers participate in it, In the past three years, the average growth rate of LED industry was more than 30%.
especially after 1996, it grew rapidly. In 1998, it achieved sales revenue of 2.244 billion yuan, an increase of 13.44% over the previous year, output of 6.509 billion units, an increase of 5.2% over the previous year, and output value of 3.589 billion yuan, There are about 15000 employees, 20% of them are engineers and technicians, and the industry assets are 350 million yuan, which has initially formed the industrial scale. At the same time, the industrial development has also driven the development of surrounding supporting industries. In addition to LED chips, there are domestic production and supply of main raw materials, spare parts, and required instruments and equipment. Many domestic universities and research institutes have light-emitting materials, new structures, new devices, and so on A lot of research work has been done on new applications and many achievements have been made. In 1998, more than 250 scientific research and development projects have been completed, and some achievements have reached the international advanced levelAmong many manufacturers,
there are more than 20 Hou Dao packaging factories, including lianchuangjianhe, Foshan optoelectronics, Ningbo AMITA, Xiamen Hualian, Tianjin Tianxing, Suzhou semiconductor, Shenzhen Chaoliang, etc; In terms of chip production, there are five. At present, Nanchang Xinlei company is the only chip manufacturer that can supply chips in batches, with a production capacity of 200kk per month. It is reported that the company is working out a production expansion plan, with a target of 200kk per month. It is reported that the company is working out a production expansion plan, with a production capacity of 500kk per month. The successful operation of Xinlei company has changed the situation that China's chips only rely on imports, The commissioning of Shanghai Jingtian was encouraging, but it has experienced a painful process of cooperation in its operation. Recently, there has been a first-line turnaround in the production of traditional LED chips. It is said that there is a trend of short supply and tight market. However, it is far from large-scale mass production. The other three factories are still in the trial production stage, and few products are on the market; In the aspect of four dimensional chip manufacturing, three enterprises have invested in it, and so far there is no output and sales; Six manufacturers have invested in the development and production of light-emitting materials, of which three factories make epitaxial wafers of traditional chips, and three factories use MOCVD technology to make four dimensional materials. At present, little progress has been made, and they are all in the experimental stage.

LED display is one of the main applications of light-emitting diodes.
in recent years, LED display has developed rapidly, It is very difficult for foreign companies to compete in the mainland market. According to incomplete statistics, in 1998, there were more than 150 manufacturers of LED display panels in China, manufacturing about 50000 square meters of various types of display panels, with an output value of 1.4 billion yuan. The main manufacturers include Beijing Lantong, Nanjing lop, lianchuangjianhe, Shanghai Xinmao, Shanghai sansike, northeast microelectronics, Xi'an Qingsong, Tianjin data, Shenzhen Tongzhou, etc, The outdoor screens and full-color indoor and outdoor screens produced by these companies can be accepted by users,Promote the development of information display market; Taiwan has made remarkable achievements in the development of LED industry. In recent years, it has been pressing Japan's trend in terms of product structure, production technology, product quality, mass production level and market share. In the world's LED industry, it ranks the third in the world, next to the United States and Japan. In the past five years, the average annual growth has reached more than 20%. In 1997, Taiwan's top ten optoelectronic products ranked the fourth, With an output value of NT $18870 million, EPISTAR Corp has successfully developed red, green and blue chips for full-color lamps and displays. The light intensity of these chips exceeds 70 MCD. A company in production uses MOVPE technology to produce InGaAlP ultra bright luminescent materials and chips; There are seven companies producing LED chips in Taiwan, which produce traditional chips of various colors, accounting for more than 70% of the world's output. The main manufacturers are Guanglei, Dingyuan, Guangbao, Guolian, etc. famous optoelectronic companies in Europe, America and Japan also use Taiwan chips. There are more than 30 packaging factories in Taiwan, and 10 of them are large companies, mainly Guangbao, Yiguang, Jintai, etc. most of these manufacturers set up factories in the mainland to expand their output, As a result, China's LED industry has strong overall strength.
it is expected to become an important pillar industry of electronic basic products.

the application of light-emitting diodes is very common.
due to low working voltage, low power consumption, rich colors and low price, it is welcomed by electrical engineers and scientific researchers, and the early traditional products have low luminous efficiency, Generally, the light intensity is several to dozens of MCDS, which are suitable for indoor applications, such as household appliances, instruments, communication equipment, computers and toys. Due to the development of application technology, new application opportunities have emerged for traditional products. The popular LED Christmas lights include duckbill type Christmas lights, colorful ball type lights and low-cost window lights,Moreover, it has rich colors, is not fragile, and is safe for low-voltage use. Recently, it has a strong market in Hong Kong and other Southeast Asian regions, and is generally welcomed by people. It is threatening and replacing the existing Christmas market of electric bubbles; A kind of flash shoes is popular with children. It is very eye-catching by using the flashing LED when walking and sleeping. It has both monochromatic light and bichromatic light. According to the general manager of a shoe company in Zhejiang Province, only Wenzhou uses 500kk light-emitting diodes a year; Toothbrushes with health care function are widely used in developed countries. It is very convenient to use light-emitting diode as the indicator of electric quantity of toothbrushes. Each toothbrush is equipped with an LED lamp. According to the introduction of domestic manufacturers in production, the company has a small number of health toothbrushes on the market, and it needs 300kk light-emitting lamp when it is planned to produce; In terms of industrial products, led type AD11 indicator lamps are widely used in power supply cabinets. This product uses multi chip integrated light source, which has three colors of red, yellow and green. After capacitor voltage reduction, it can use 220 V and 280 V power supply. According to a Jiangsu manufacturer, the company's annual sales reach more than 10kk, and it needs 200-300kk LED chips every year. The market still has expansion potential, Due to its clear indication, long service life and low power consumption, active light-emitting diodes are very popular among users, and will soon replace all the AD11 products. In short, the market of traditional light-emitting diodes will not only improve with the growth of the original application products, With the development of new materials and semiconductor industry technology,
since 1994, new visible light materials InGaAlP and InGaN have been used as the mainstream to achieve high brightness and addition, with the improvement of packaging technology and large-scale display information, new application fields of LED products have emerged, bringing more market opportunities, These products promote LED applications from indoor use to outdoor use,Blue and green LED: blue LED materials include silicon carbide (suc), gallium nitride (GAN) and indium gallium nitride (InGaN), etc, The peak wavelength of blue light-emitting lamp made of InGaN / AlGaN structure is 470nm, the normal light intensity is 2000mcd, the peak wavelength of green light-emitting lamp is 520nm, the normal light intensity is 5000mcd, and the blue-green (traffic green) light-emitting lamp with the peak wavelength of 500nm is added to the chip to convert into white on the basis of blue light-emitting, White light diode is the best substitute for miniature incandescent lamp. Although its price is more expensive than that of electric bulb, it is not easy to break and more energy-saving. It works almost without heating and can be used for continuous lighting for more than 10 years. These products are widely used in Japan, Germany, Japan and other countries Some famous optoelectronic companies in the United States and Taiwan produced and put them on the market.

2. Novel four dimensional light-emitting diodes: GaAlAs materials developed and put on the market in the late 1980s.
to make red light-emitting diodes, we first realized the requirement of ultra-high brightness, the luminous intensity exceeded 1000mcd, but the light attenuation was large, so the application scope was limited, The product can be made into red, orange, yellow, amber four colors, high luminous efficiency, and high temperature performance, is an ideal product for outdoor use.

3. New varieties of LED and power LED: the working current is 70ma.
it emits a very strong beam, and the viewing angle is large, generally 40-70 degrees, which is used for Car Sign lamps; SMD LED works under low current,Generally 1-2ma, with enough brightness, can save the power consumption of portable products; Constant voltage light-emitting diodes (CPLDs) are made by encapsulating the resistor inside. They do not need the current limiting resistor. They generally work below 12V, which is very convenient for users. They are also packaged with an integrated circuit, which generally works below 5V. When they are powered on, they will flash and emit light, which can be used as state display. This kind of cluster LED chips, devices and components can be made into light-emitting modules, To achieve specific functional requirements, multi-color lamps are composed of LED multi chip clusters. Typical red, green and blue colors can form full-color lamps, showing white light at the intersection of the three colors.

these new devices appear to expand the application field of LED.
first, the application of traffic signal display light source has the characteristics of shock resistance, fast light response, long power saving life, etc, There are about 11 manufacturers developing traffic lights in China. The products of three companies have passed the testing of certification bodies. Recently, traffic lights have been tested in Beijing, Shanghai and Tianjin. In 1997, many domestic manufacturers of traffic sign lights showed the samples of LED traffic lights at the fifth Multi Country City Traffic Exhibition in Beijing; The second is the application in the automobile industry. Incandescent lamps used in automobiles are not resistant to vibration and impact, and are easy to be damaged. They have a short service life and often need to be replaced. Since 1987, China began to install high mounted stop lamps on automobiles. Due to the fast response speed of LED, it can remind drivers to brake as soon as possible, reduce rear end collision accidents, and increase safety, In developed countries, the central rear mounted high brake lamp made by LED has become a standard part of automobile. The LED automobile tail lamp module launched by HP company in 1996 can be combined into various automobile tail lamps at will; The third is LED backlight,In particular, the backlight with high efficient side light is the most attractive. As the backlight of LCD, LED has the characteristics of long service life, high light efficiency, no interference and high cost performance. It is widely used in electronic watches, mobile phones, BPCS, electronic calculators, card swiping machines and so on. With the miniaturization of portable electronic products, LED backlight has more advantages, and it is widely used in mobile phones, Therefore, the backlight manufacturing technology will develop to be thinner, low power consumption, uniform and consistent. The thickness of LED side backlight board can be 0.7-3.5mm, and the light output efficiency can reach 50-70%. Green, red, blue and various mixed colors are available for customers to choose, and the ultra-thin backlight with the same thickness as El may appear in the near future; The fourth is led lighting source that people are most interested in. The direct goal is to replace incandescent lamp and fluorescent lamp with LED light source. This trend has begun to replace incandescent lamp and fluorescent lamp in some areas and from small to large. Japan's Ministry of trade and industry calls on the whole country to save energy. It is planning to replace incandescent lamp LED project (known as the project to illuminate Japan). The first five years' forecast is 5 billion yen, If led replaces half of incandescent and fluorescent lamps, it can save energy equivalent to 6 billion liters of crude oil every year, equivalent to five 1.35 tons × The 106kw nuclear power plant can reduce the generation of carbon dioxide and other greenhouse gases, and improve people's living environment. Therefore, people are facing the lighting reform, and expect led to bring good news to people.

as the LED industry continues to emerge new technologies, new products and new applications.
it presents a prosperous scene of Chaoyang industry, It is believed that in the first decade of the next century, the LED industry will continue to develop:

1. Manufacturers will expand investment in super bright and full-color technology, improve production capacity, and increase employees. China (including Taiwan and Hong Kong) will become the main LED production area in the world,It is estimated that it will account for more than 60% of the world's total, and the output value will reach 7 billion yuan in five years' time. Ultra high brightness LED will grow by 30%, while traditional LED will also grow by 5% - 10%.

2. At present, many color LEDs have reached candlelight level.
I believe that with the improvement of device structure and the rapid improvement of luminous efficiency, the main direction of led development in the future is lighting source, It began to replace incandescent lamp in some fields. During this period, it will complement, coexist and develop with other light sources. People are facing the change of lighting source. Some people predict that led is the lighting source in the 21st century.

3. The development of the world optoelectronic industry promotes the change and development of application fields.
it is believed that with the development of LED industry, more funds will be invested in the research and production of LED, Therefore, the existing ultra-high brightness, blue and green LED technology monopolized by a few manufacturers will break through, and the product cost is expected to drop significantly, so as to promote the market RE development and re expansion of applications.

it can be believed that.
the semiconductor light-emitting technology will not be replaced by other technology products, and will continue to develop along the original track.
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