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LED drive technology has been widely used in household lighting, industrial lighting, backlight circuits, consumer electronics lighting, LCD lighting, etc., especially in the recent Chinese government's policy of strong support for green new energy, and the large-volume listing of LED-backlit TVs. , the application of LED technology to a new height.
LED backlight replaces CCFL mainstream status just around the corner
CCFL backlights have high voltage, short life of light source, power consumption, and environmentally unfriendly materials. This makes LED backlighting solutions with low voltage, long life and environmental protection advantages from mobile phones to medium and high-size LCD application systems. More than 50% of computers use LEDs as backlights, and so are netbooks that have developed rapidly since 2008. In LCD monitors and TVs, the penetration of LED backlights also accounts for 5%. The high cost and size limitations of LED backlighting are rapidly improving, and the overall penetration rate will continue to increase rapidly in the future. iSuppli expects the penetration of LED backlight technology to increase from 3% in 2009 to approximately 39% in 2013.
“Currently, in the 19 to 21-inch medium and small monitors and displays, the cost of LED and CCFL backlights is very close, mainly due to the small number of LEDs and more manufacturers; but in medium, high power, high brightness The LED product field, such as LCD TV backlight, is mainly based on several LED suppliers outside the country, and the number of LEDs is large. For example, 52-inch TV requires about 640 LEDs." Dr. Lin Yonglin, Executive Vice President of O2 Micro Intelligent Lighting Division A LED drive technology seminar held in Shenzhen said, "The price is indeed declining, and LED has some obvious advantages. For example, under the same brightness of the traditional CCFL30W backlight, only 15W is needed for LED. On the other hand, LED There is no half-life problem, the average life expectancy is higher than CCFL backlight. Green energy awareness has been recognized in the consumer side. Therefore, turning the traditional CCFL backlight used in large and medium size LCD into LED backlight is a new market we are optimistic about. often"
O 2 Micro has been investing in the development of LED backlight driver ICs for about 10 years, and has applied for technology patents since 2001. It currently has more than 12,000 patents. “In 2008, we applied for a patent for the LED current balancing circuit to ensure the consistency of the current flowing through each LED in the driver circuit, so that the life of the LED is highly consistent and avoids the requirements for LED screening during the manufacturing process.â€
Based on the accumulation of such technology, O2 Micro has become the manufacturer with the widest range of LCD backlight driver ICs. As shown in Figure 1, from netbooks to laptops to LCD display modules and LCDTVs, the size ranges from 8.9 to 56. ? O 2 Micro can provide the corresponding LED driver solution to meet the needs of various applications. Multiple technical features such as integrated high-speed PWM, fast switching mode, surge mode and phase shifting, and proprietary area lighting technology help developers solve multi-string LED current sharing and LED linearity The noise generated by dimming, the power dissipation, and the manufacturer's requirements for different protection specifications.
Figure 1: O 2 Micro's portfolio of backlight LED driver ICs spans multiple screen sizes.
LED lighting overcomes the shortcomings of unstable drive power quality
The power consumption of the table lamp after switching to the LED light source can be reduced by half, and there is no stroboscopic problem; the flashlight and the display lamp MR-16 can be replaced by the LED light source, which can greatly prolong the service life; after the LED head and tail lamp adopts the LED, its light effect, Life expectancy is much higher than traditional bulbs.
At the seminar, Li Shengtai, director of product development at O2 Micro, shared O2 Micro's LED driver power control IC solutions for general lighting, which can help Chinese companies develop stable, reliable and cost-effective drive power. For home lighting, O2 Micro's IC input voltage is 85~265V, which can be used in China, Taiwan, and Iceland, and has a built-in 3-stage dimming function to achieve different atmospheres and achieve further power saving. For example, when no one in the family needs to turn on the lights for safety reasons, it can use 20% brightness, and as long as 2W consumes power, it can achieve 3 sections of dimming. In addition, it also provides a protection function that not only protects the fuse, but also protects the device from overcurrent and burnout. For streetlight applications, you can use OBT's Cooper with OZ9984, which can support 40W-150WLED street lights, more than 150W street lights, and Panther is the first one.
O2 Micro's OZ9955A is designed for low power LED desk lamps that consume 5W and require 8 channels. Flashlights can use OZ9988. Traditional flashlights are often darker and darker without converters. LEDs do not have this problem. For flashlights that require only one battery, the input voltage is only 1V, and the LED light source can be replaced with few parts. The efficiency can reach 90%. The MR-16 can be OZ9991, and the driver IC solution for the lamp is OZ9986.
“The three-stage dimming of our live demonstration is just the beginning, and continuous dimming is in our development plan. In fact, the field has been covered in the patents we applied many years ago,†Dr. Lin Yonglin emphasized.
Figure 2: Dr. Lin Yonglin: Converting from traditional CCFL backlight to LED backlight, it is a new market that we are optimistic about at present. 