Author: Photoelectric News Network has Cong
The drive circuit is an important part of LED application products, and its technology maturity is gradually increasing with the expansion of the LED market. Whether in lighting, backlight or display panels, a number of mature products have emerged. However, with the further development of LED applications, the industry has put forward higher requirements for drive solutions, and also brings huge opportunities and challenges to the LED drive industry. How do we view the technology trends of LED drivers? How to interpret the current difficulties and hot spots? Where is the market direction? Faced with various questions, Optoelectronics News produced the "LED driver IC driving LED to popularization" news topic, comprehensive analysis of existing technical solutions, interviewing well-known experts in the industry, exploring the development trend of the industry, and striving for the LED industry The status quo and future trends are reported in all directions. The following is the view of China Resources Weiwei Yanguangguang Manager.
Yan Chongguang, Marketing Manager of China Resources Weiwei Technology Co., Ltd.
Optoelectronic News Network: Please briefly introduce the layout of LED driver series of China Resources Converse. What are their advantages and characteristics?
Yan Chongguang: The layout of China Resources Converse LED driver series is mainly the backlight of mobile phone and MP3 LCD screen. In recent years, it has entered the LCD screen backlight of MP4, P-DVD and GPS. This year's new products will enter NB and The LCD screen of the netbook is backlit, and next year's new products will focus on the backlight of the LCD TV. In 2007, it successfully developed the first generation of local LED lighting driver ICs of PT4105. Later, it launched PT4115 and PT4107 LED driver ICs. It is widely welcomed by emerging LED lighting manufacturers because it provides DEMO solutions that can be directly used in LED Lamp production. PT4115 The shipment of PT4107 has soared. The LED large-screen driver IC has not been involved in the development due to the limited market for LED large screens.
Optoelectronic News Network: What are the current difficulties in LED driving? What is the gap between domestic and foreign manufacturers?
Yan Chongguang: The technical difficulties of LED driver ICs are high constant current accuracy, wide voltage range of Vin, high voltage process of wafer, and heat dissipation of MOS built into chip. With a large number of European and American famous integrated circuit companies with many years of design experience, returnees are returning to allegiance. The level of power chips designed by local integrated circuit companies is completely close to the foreign similar level, and has good cost performance and competitiveness. At present, LED drivers of foreign companies IC also has certain advantages in voltage withstand, and local ICs need to redouble their efforts.
Optoelectronic News Network: What is the current competitive landscape of LED drivers in China? What is the market position of China Resources Converse?
Yan Chongguang: At present, the competition of domestic LED driver ICs is a three-pronged pattern of foreign famous brand IC companies, Taiwan-funded IC companies and local IC companies. The IC itself has cost-effective and performance-optimized, low-cost system solutions that can be directly used in production. It will be the key to winning the competition. From June 2009, China Resources Converse has promoted the MR16, 220V/110V fluorescent lamp solutions that can be directly used for production, and provides the final manufacturer with DEMO, circuit diagrams and bill of materials (BOM) that can be directly loaded into the lamps to promote the products. The cycle has been shortened from a few months to a few weeks or even a few days in the IC marketing application practice, and the PT4115 and PT4107 are therefore hot. Recently, the application schemes of off-line LED spotlights E27, PAR30 and P38 based on PT4201 and PT4201, and DEMO which can be directly used for production have been introduced, providing LED lamp manufacturers with more direct product design and turnkey one-stop technical services.
Optoelectronics News Network: In terms of backlight, there are edge backlight, direct backlight, RGB backlight, which technology do you like? What are the advantages and disadvantages? What is the future direction of development?
Yan Chongguang: Phosphor white LEDs are obviously slightly inferior to RGB in terms of sharpness and color purity. However, due to low application cost and relatively simple control technology, there are many applications at present; RGB LED backlights are difficult to be used due to high application cost. Widely accepted. In the current market, LED white LEDs are the main backlight LEDs.
The application of phosphor white LED backlight can be divided into "edge backlight" and "straight down backlight". For the edge backlight, the technical solution is relatively simple to implement, and the cost is relatively low, so that the product can be thinned. This application technology has been applied for many years in small screen products such as mobile phones, MP3, MP4, PDA, GPS, etc. “It is to arrange the LED side on one side of the LCD screen, and the LED Light is used to backlight the LCD through the light guide plate; for the direct backlight, because the backlight brightness is dynamically adjusted with the display content, the scheme is more complicated and the cost is relatively high, but Greatly improve the contrast and effectively reduce the power consumption of the whole machine. At present, edge backlighting in the domestic market is more common.
Optoelectronics News Network: In the aspect of LED display, where is the difference in driving technology between different manufacturers? Which aspect will be developed in the future?
Yan Chongguang: In the LED large-screen application, the stability, reliability, long life, constant current accuracy and response time of the LED driver IC will be the technical indicators for the primary assessment. The competition from different manufacturers also stems from this.
Optoelectronic News Network: According to your personal understanding, what is the gap between LED drivers of domestic manufacturers and international companies?
Yan Chongguang: The main gap between LED driver IC domestic manufacturers and international large companies is still in the aspects of stability, reliability, long life, constant current accuracy, wide voltage input range and withstand voltage. Lamps and LED large screens especially strengthen these technologies. Indicators, LCD screen backlights for handheld consumer electronics, can withstand voltage requirements for driver ICs because they do not use AC power directly.
Optoelectronics News Network: What are the advantages of China Resources Converse's drive in power management?
Yan Chongguang: As far as the LED driver is concerned, the current PT4115 and PT4107 of China Resources Converse use the frequency-jitter technology to eliminate EMI, simplifying and omitting the anti-EMI part of the application circuit. PT4115 has Vin=6-30V, Iout=1.2A; PT4107 system uses Vin=85-264VAC, Vout=70-100VDC, Iout=300-350mA.
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