Opportunities and challenges behind common shade energy saving LED display From the search led net
With the rapid development of economy, green, energy saving, environmental protection has become a global consensus and focus, the "13th Five-Year Plan" energy saving and environmental protection Industry Development Plan, proposed that by 2020, energy saving and environmental protection become a pillar industry of the national economy, in addition, the state has also increased our country's environmental protection and energy saving industry financial expenditure.
Since the beginning of its birth, LED display has been widely used with high brightness, rich color, flexible size application and other characteristics, but LED display is not only a beautiful display carrier, but also a large power consumption of the "heating resistance", especially outdoor advertising screen, power consumption is amazing. In response to the national energy conservation and environmental protection policy, to meet customers' high demands for product reliability, service life and display consistency, energy conservation and environmental protection, many LED display manufacturers launched LED display products and related LED display accessories with common negative power supply technology, claiming that the excellent performance of saving 75% energy has attracted high attention of the whole industry chain.
What is a co-negative LED display?
"Common shade" refers to the common shade power supply mode. The common shade LED display adopts separate power supply of R, G and B, accurately distributing voltage and current to the red, green and blue lamp bead, and the current passes through the lamp bead and then to the IC negative electrode, so that the forward voltage is reduced and the internal resistance of conduction is small. Compared with the traditional display screen, there are two biggest differences. First, the power supply direction is different. The current of the common positive LED display screen flows from the PCB board to the lamp bead, and the RGB lamp bead is powered uniformly, which increases the positive voltage drop of the circuit. Common negative LED display current first through the lamp bead and then to the IC negative pole, the positive voltage is reduced, the conduction internal resistance is small. Secondly, the power supply voltage is not the same, the common positive LED display usually gives red, green and blue beads a voltage higher than 3.8V (such as 5V) unified power supply, large power loss; Common shade LED display according to the red, green, blue three chips actually need voltage (red bead voltage requirements about 2.5V, blue, green bead voltage requirements about 3.8V) separate precise power supply, less power loss, LED display work generated much lower heat. Through the comparison of the above co-shade and co-sun power supply modes, we know that the co-shade LED display consumes much less electricity than the co-sun LED display, and the heat is much lower.
Common shade LED display low heat principle
Cold screen special co-shade power supply mode, so that the LED display in the process of working less heat, low temperature rise. Under normal conditions, the temperature of the cold screen is about 20℃ lower than that of the same type of conventional outdoor LED display when the white balance state and playing video. With the same specifications, under the same brightness condition, the screen body temperature of the co-negative LED display is more than 20 degrees lower than that of the conventional co-positive LED display products, and the power consumption is more than 50% lower than that of the conventional co-positive LED display products.
Advantages of common shade LED display
① Precise power supply is really energy-saving:
Common shade products adopt precise power supply control technology, based on the photoelectric characteristics of LED red, green and blue three primary colors, with intelligent IC display control system and independent private mode, accurately allocate different voltages for LED and drive circuit, making the power consumption of the product relative to similar products in the market about 40%.
② True energy saving brings true color:
Common negative LED drive mode, can accurately control the voltage, reduce power consumption, but also reduce the heat, LED continuous work without wavelength drift, stable display of true color.
③ True energy saving brings long life:
Energy consumption is reduced, which greatly reduces the temperature rise of the system, effectively reduces the probability of LED damage, improves the stability and reliability of the whole display system, and greatly extends the life of the system.
Common shade LED display opportunities
According to the current energy-saving and environmental protection policies advocated by the state and the future development needs of LED display, energy-saving products are the general trend, and the emergence of common shade LED display has undeniably become the support point pursued by this industry. The promotion and popularization of co-shade LED display is of great significance to the sustainable development of LED display industry and society. According to statistics, the global production of LED display every year is more than 3.5 million square meters, and the power consumption of 500 watts per square meter is 1.75 billion KWH per year. And that's not even counting the amount of electricity used in the production process; If all the common shade energy-saving screens are adopted, the society will save at least 525 million KWH of electricity every year. If the production of a ton of coal is 3333 degrees, it is equal to saving at least 157,500 tons of coal for the society every year. The equivalent of closing one small coal mine for the country every year. Enterprise layout common shade energy saving is also one of the ways to take the road of differentiation, but at present, the market can really realize this technology is still limited enterprises.
The industrial chain of common Yin technology is not yet mature
As the development trend of energy-saving common shade LED display, is necessarily the comprehensive result of a variety of indicators, LED bead, driver IC, switching power supply, product power consumption design, intelligent energy saving system design and structural energy saving design related to the energy saving effect, can be said to cover the LED display industry from LED display factory, driver IC factory to LED packaging factory, such as upstream and downstream. It also requires the cooperation of the entire industry.
At present, Coyin LED display technology related supporting is not as mature as Coyang LED industry chain. Total Yin IC series is not complete, the overall volume is not large, total Yang still occupies 80% of the market. The main reason for the slow progress of co-cathode technology is the high production cost. Based on the original supply chain collaboration, co-cathode requires the customized cooperation of all ends of the industrial chain, such as chip, package and PCB, and the cost is high. Once mass production is achieved, production is standardized rather than customized, especially if there is a strong push up and back by the end manufacturer, the co-yin technology has the opportunity to move faster.
Patent issues are the biggest obstacle
According to the relevant survey, since 1999, LED display driver IC field related patents about 3997. The number of related patents in this field began to accumulate and increase significantly in 2002, and entered the stage of rapid growth from 2010 to 2016. In the field of co-cathode architecture, the main applicants currently include: American Silicon Core, Guangzhou Silicon Core Electronics, Hangzhou Vision Core, Fuzhou Fudahai Silicon Microelectronics. Among them, the United States silicon core and Guangzhou Silicon Core Electronics are the main patent applicants in this field. As early as 2011, they began to apply for patents in China and the United States. In 2013 and 2015, three Chinese patents including the main case CN102855841B were approved; In 2015, three US patents including the main case US8963810 were approved, mainly covering LED display system including LED array and LED driver circuit. At present, the most common and advantageous Array (array) architecture core patent has been mastered by an American silicon core, a display manufacturer that does not sell driver IC. The international community pays great attention to patents. If the common architecture is applied by others and is not made public, the big industry cannot use it. Not conducive to the overall development of the industry.
It is certain that in the future, the common Yin LED display will be an important chip in the competition of enterprises. Common shade energy-saving LED display with its superior low heat, low power, low loss, cost and other advantages to attract many manufacturers competition, common shade energy-saving technology is a trend, but can not be used as a gimmick for enterprise competition, so in order to achieve large-scale production, there are many problems: The innovation of common shade LED display technology cannot only rely on the independent completion of the terminal display manufacturers, but needs the full cooperation of the upstream and downstream manufacturers of the industrial chain. Secondly, in this process, it also needs to avoid the risk of patents.