Optimizing LED technology to deal with the challenge of high performance LCD backlight design

Currently LCD backlight industry is moving from CCFL to a variety of LED technology. Compared with the traditional CCFL technology, LED has many advantages as a LCD backlight, such as: better color gamut. The performance of LED backlight source is stronger than that of CCFL backlight, which can be used to compensate for the lack of LCD technology, and the color is restored well. LED backlight can flexibly adjust the luminous frequency, and the frequency is much higher than CCFL, so it can be a perfect picture of the movement. The red green and blue 3 color independent light, it is easy to show the color characteristics of the precise control; the current global market demands for green rising, to achieve energy-saving and non pollution as much as possible, while the LED backlight can conform to this trend.

Laptops, televisions, monitors, and car monitors are the main drivers of the development of LCD display technology, and these products are facing new challenges and innovative solutions. The demand for high performance and color performance, coupled with better power management and energy efficiency will become the main trend of LCD backlight technology development.

LED CCFL is to replace the market development trend, however, the current LED technology itself is still facing some challenges, such as low luminous efficiency, high cost, the price is expensive; using LED as backlight has consistency of white light. With the improvement of LED backlight in the power performance, efficiency and color control system, the technology will be more convenient to meet the needs of the end user of more environmentally friendly, more efficient backlight technology. Emerging RGB LED technology as the industry's next opportunity to further meet consumer demand.

With the LCD backlight shifting to a variety of LED technologies, design engineers need to deal with new challenges in power management, thermal management, and color management. In order to achieve a better product, the supplier must solve the problem of improving the efficiency of LED and the optimization of the whole system. System level solutions will be the industry's highest return.

The choice of backlight scheme depends on the terminal application and the target user. For example, the notebook computer Inverter Manufacturer's main concern is the cost, power efficiency and use in a number of OEM on the platform of RGB TV; while the high-end manufacturers of color management and efficiency are more interested in. Specific design should be from the system (rather than a single device) point of view to consider the main issues, such as cost, color performance, power consumption, design flexibility, etc..

Microsemi company has been committed to the development of breakthrough technologies for lighting applications, the use of system optimization methods to develop products, and strive to provide the market with the best compromise between cost and revenue. Microsemi has a wealth of product technology, including LED drives, visible light sensors and color management technology, to provide differentiated solutions for display manufacturers. For example, the second generation of DAZL Microsemi! Series hybrid signal high voltage LED driver, the program integrates the necessary power supply system, analog and logic functions, and the use of compact package, can be used to drive multiple LED strings. While driving the LED string, it can monitor and measure the voltage and current of the backlight LED string, and control the power supply voltage to achieve the best performance. Is ideal for LCD TV and other large screen LCD monitors. As a market leader, Microsemi will continue to provide innovative technology to meet customer needs, to help them improve the development of high quality, high performance and competitive products.

Source: Electronic Engineering album