Analysis of three stages of LED development and four major technical problems

　　Everyone is familiar with LED display screens, which can be seen everywhere in life. They can be seen everywhere in stations, shopping malls, squares, auditoriums, airports, and buildings. According to statistics, China currently occupies the largest market of LED display screens in the world. With its own excellent characteristics and the promotion of the market, LED display screens have now been transformed from traditional bulky single-color types to light and easy to install, which are deeply loved by users. The LED display screen industry has quickly occupied a place in the market and has now become a new favorite in the market.

　　LED development has three specific stages

　　1. Utility model stage of LED display screen: LED display screen has the characteristics of environmental protection, high brightness, high definition, high reliability, etc., which gradually stand out. In the previous stage, the LED display screen market only met people's needs, but the LED display screen products did not meet the requirements and the quality was not up to standard. With the development of LED display screens, LED products have made a new breakthrough. At least it is more advanced than the previous stage. A series of products that are completely different from traditional light source applications have also been developed and will be popular. LED display screens will have a larger and broader development space. LED display screens are not only beautifying, but its variability makes it more relevant to every bit of people's work and life. Now manufacturers have to compete in design application and technology research and development advantages.

　　2. Intelligent control stage of LED display: With the continuous progress and development of LED display technology, LED, as a semiconductor industry, will also catch this high-speed train and play its high controllability. From home to office building, from road to tunnel, from car to walk, from indoor to outdoor, LED display system with intelligent control will bring higher level of service to human beings. The LED display industry will also go through the process of making products, designing products, and providing overall solutions.

　　LED display screen replacement acceptance stage: Since the characteristics of LED display screen products are mainly reflected in high light efficiency (low energy consumption) and long life, this stage is the early stage of LED display screen development, so in terms of price, there is a certain comparison in the eyes of customers. Of course, there is a process of acceptance for customers, a transition and acceptance of customer usage habits and appearance. Let customers understand the characteristics of LED display screen products and choose one with characteristics such as power saving and long life. In this way, customers are more likely to accept its relatively high price, especially in commercial occasions. Moreover, customers now pay less attention to price and mainly to quality. Therefore, manufacturers are now competing for quality and price advantages.

　　How to solve the four major technical problems of LED display screen

　　There is a lot of knowledge in solving the technical problems of LED display screens. Many people think that it is too simplistic. In fact, the following four aspects are the most convincing and authoritative practical proofs for truly solving the technical problems of LED display screens.

　　The first is high luminous efficiency: The luminous efficiency of LED display screens can be said to be an important indicator of energy-saving effects. At present, my country still needs to strengthen its luminous efficiency. To truly achieve high luminous efficiency, we must solve related technical problems in all links of the industrial chain. So how to achieve high luminous efficiency?

　　1. Improve internal quantum efficiency and external quantum efficiency.

　　2. Improve the light output efficiency of the package and reduce the junction temperature.

　　3. Improve the light collection efficiency of lamps.

　　Secondly, from the perspective of high color rendering: LED display screens have many color qualities, including color temperature, color rendering, light color fidelity, light color naturalness, color tone recognition, visual comfort, etc. Here we are only discussing how to solve the color temperature and color rendering problems. Making a high color rendering LED display light source will lose a lot of light efficiency, so these two factors must be taken into account during design. Of course, to improve high color rendering, the combination of RGB three primary colors must also be considered to achieve it.

　　1. Multi-primary color phosphor.

　　2.RGB multi-chip combination.

　　3. Phosphor plus chip.

　　The second is from the perspective of high reliability: mainly including failure rate, lifespan and other indicators. However, there are different understandings and explanations in the application. High reliability refers to the ability of the product to complete the specified function under specified conditions and within a specified time. The main types of LED failures are serious failures and parameter failures. And lifespan is the characterization value of product reliability. : Generally refers to the statistical average value. For a large number of components, the lifespan of LED devices is the meaning of this description. However, the factors that affect the reliability of LED display products include chip manufacturing, packaging, thermal resistance, heat dissipation, etc. Now that we are talking about this, we hope that companies will implement comprehensive quality control on LED display products.

　　1. Reduce failure rate.

　　2. Prolong the time of failure due to wear and tear.

　　Finally, in terms of reducing product costs: Currently, many consumers feel that the price of LED display screens is too high, so many LED display screen entrepreneurs have taken corresponding measures to reduce costs. In addition to mass production, they mainly take technical measures to reduce costs. The main methods and ways are to reduce costs in epitaxial chips, packaging, driving, heat dissipation, etc., so as to fundamentally solve the cost problem of LED display screen products.

　　1. Methods to reduce costs in the epitaxial chip segment.

　　2. Methods to reduce costs in the packaging process.

　　3. Methods to reduce costs in the lighting sector.

　　4. Reduction of other supporting costs

　　The above mainly solves the main technologies and takes corresponding measures for LED display screens from the four major technical aspects of high luminous efficiency, high color rendering, high reliability and low cost. In general, in addition to achieving high luminous efficiency, high color rendering, high reliability and low cost of LED display screens through the use of new technologies, new processes, new structures, new materials and other measures, from a deeper level, improving energy efficiency and light color quality should be regarded as a higher requirement for LED display screens, so as to truly provide people with product demand!

　　A brief discussion on the development prospects of LED display screens

　　From a global perspective, the core technology and professional technology of my country's LED display industry are still in the hands of international manufacturers. Under the background of global energy conservation and emission reduction, countries have launched plans to ban incandescent lamps and promote LEDs. However, due to the strong support of the current national policies, the future prospects of the LED display industry are unlimited and will be a rising star in the future.

　　1. Deepening of product technology and diversification of products

　　LED device technology and performance are constantly improving, and electronic technology is developing rapidly, which provides a good foundation for the technical deepening and improvement of LED display products. At the same time, LED display has been widely used in various fields of social life, and the development of the semiconductor lighting industry has brought good opportunities to the LED display industry. Therefore, the development prospects of the LED display market are optimistic. Deepening the technical connotation, enriching the product system, diversifying products, and highlighting the advantages of leading products will be important trends in the development of the LED display industry in Chengdu, Sichuan.

　　2. Standardization of conventional products and specialization of products for specific application areas

　　The publicity, implementation and promotion of relevant standards will promote the standardized development of LED display products. Among conventional LED display products, standardized display devices and control systems will be more widely adopted, integrated LED display products will occupy a major position in the industry, and the specialized division of labor in the production of standardized LED display products and market technical services will be more obvious. In the field of professional applications, the professional level of LED display products will continue to improve to meet the needs of professional applications. Specialized products combined with application needs will expand to form new products and new application fields of LED displays, such as large-area LED displays for urban lighting projects, LED displays for sports stadiums, and LED displays in the transportation field.

　　3. Reasonable division of labor within the industry and the formation of a new industrial structure.

　　With the development of technology and market, my country's LED display industry will gradually improve and have a reasonable division of labor in the process of adjustment, forming a new industrial pattern. In the overall industrial chain, the formation of leading enterprises in LED device production and backbone enterprises in display product production will redefine the division of labor between upstream and downstream industries, highlighting the specialization of division of labor and collaboration. Perhaps in the early stages of the development of the semiconductor lighting industry, the definition of the specialization of division of labor and collaboration between LED device manufacturers and display product manufacturers is relatively vague, but with the expansion of the market and the maturity of technical products, this definition will become clearer.

　　In the LED display industry, the enterprise groups within the industry will be appropriately classified, and gradually form technology development enterprises focusing on key control system technology research and development, product manufacturing enterprises focusing on large-scale and standardized production, technology service enterprises focusing on market application promotion, and professional application enterprises mainly focusing on meeting professional market needs.

　　The difference between LCD and LED liquid crystal display

　　Liquid crystal display screens have been widely used in current electronic products, from all-in-one computers to notebooks and mobile phones. The application of LCD screens in laptops has a history of many years. The screen is one of the most direct accessories that users come into contact with in daily life. The quality of the screen and whether its display effect is excellent can directly affect the user's experience. Let's take a look at the differences between LCD and LED liquid crystal display screens.

　　1. What is LCD?

　　LCD is the full name of Liquid Crystal Display, which mainly includes TFT, UFB, TFD, STN and other types of LCD screens. Unable to locate the program input point on the dynamic link library.

　　TFT is commonly used in laptop LCD screens. TFT (Thin Film Transistor) refers to thin film transistors. Each liquid crystal pixel is driven by a thin film transistor integrated behind the pixel, so that screen information can be displayed at high speed, high brightness, and high contrast. It is one of the best LCD color display devices and the mainstream display device on laptops and desktops. Compared with STN, TFT has excellent color saturation, restoration ability and higher contrast, and can still be seen very clearly under the sun, but the disadvantage is that it consumes more power and has a higher cost.

　　2. What is LED?

　　LED is the abbreviation of Light Emitting Diode. LED applications can be divided into two categories: one is LED display screen; the other is LED single tube application, including backlight LED, infrared LED, etc. Now as far as LED display screen is concerned, China's design and production technology level is basically synchronized with the international level. LED display screen is composed of light emitting diodes. It adopts low voltage scanning drive and has the following characteristics: low power consumption, long service life, low cost, high brightness, few failures, large viewing angle, and long viewing distance.

　　3. The difference between LCD and LED

　　Compared with LCD displays, LED displays have advantages in brightness, power consumption, viewing angle, and refresh rate. LED technology can produce displays that are thinner, brighter, and clearer than LCD displays.

　　1. The power consumption ratio of LED to LCD is about 1:10, and LED is more energy-efficient.

　　2. LED has a higher refresh rate and better performance in video.

　　3. LED provides a viewing angle of up to 160° and can display various text, numbers, color images and animation information, and can play color video signals such as TV, video, VCD, DVD, etc.

　　4. The reaction speed of a single element of the LED display is 1,000 times that of the LCD screen. It can be read even under strong light and can adapt to temperatures as low as minus 40 degrees Celsius.

　　Simply put, LCD and LED are two different display technologies. LCD is a display screen composed of liquid crystals, while LED is a display screen composed of light-emitting diodes. However, the LED display screens currently on the market are not true LED displays. To be precise, they are LED backlit liquid crystal displays, and the liquid crystal panel is still a traditional LCD display screen.

　　For LCD monitors, the most important key is its LCD panel and backlight type. The LCD panels of monitors on the market generally use TFT panels, which are the same. The difference between LED and LCD is only their backlight types: LED backlight and CCFL backlight (also known as fluorescent lamp), which are diodes and cold cathode lamps respectively.

　　The difference between LED display and LCD display:

　　1. LED backlight: saves power (30%~50% compared to CCFL), high price, high brightness and saturation.

　　2. CCFL backlight: Compared with LED backlight, it consumes less power (still much less power than CRT) and is cheaper.

　　3. Picture difference: LED backlight has brighter colors and higher saturation (CCFL and LED have different natural light sources).

　　4. How to distinguish: LED backlight will be specially emphasized as LEDTV, while those without emphasis are CCFLLCDTV.

　　Summarize

　　With the gradual development of LED display screens, large LED display screens can be seen in almost every corner of the world, which generally adds color to the world and beautifies every city. At the same time, it has been well received by consumers, and the LED display industry has rapidly flourished and formed a new stage of development.