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Enhanced LEDs boost 'green' display energy efficiency

Posted: 26 May 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LED? green technology? display? energy efficency?

This year's DisplayWeek has made one thing clear: flat panel displays' energy efficiency will constantly improve as backlight LEDs are continually enhanced and designed for better performance.

"The LED efficiency continues to improve, around 10-15 percent per year through improving internal quantum efficiency (IQE) and increasing light extraction efficiency," according to Ross Young, senior vice president, Displays, LEDs and Lighting for IMS Research.

At the "Green Technologies" market research conference held in conjunction with the Society for Information Display event in Los Angeles, the consensus was lower-power displays have an overall economic advantage over higher-power displays.

Helping along are the government Energy Star compliance specifications. Version 4.0 was introduced in May 2010, reducing power requirements by around 40 percent. Version 4.0 also requires TVs to use less than 1W in standby mode.

Energy Star 5.3 goes into effect in September 2011 which will be particularly challenging for large screen displays as not only are power requirements reduced by another 30 percent at smaller sizes, but power requirements will no longer scale with screen size beyond 50 inches (convert to mm except for displays), resulting in a 40 percent reduction at 55 inches, according to Young.

"Plasma TVs will have a real problem meeting 5.3 over 50 inch," said Young. "CCFL LCD TVs will also be challenged by Energy Star 5.3."

"The average power consumption for TVs is rising sharply due to the rise of average screen size and the wide spread of larger screen LCD TVs," said Jun Souk, senior adviser to the LCD division at Samsung.

"The economics of green displays is such that if all the FPD TVs in the U.S. households meet ES 4.1, there could be $5 billion in yearly energy savings. If all TVs meet ES 5.1, that could translate to $7 billion in savings."

Beyond LED-backed LCD TVs, Jung sees optical shutters with MEMS technology providing a short-term efficiency boost, and beyond that, more improved efficiency will come from electro-wetting displays which Liquavista, acquired by Samsung earlier this year, is working on.

Liquavista's technology is available in transmissive, reflective and transflective modes with 2x, 3x, 4x optical performance. "EWD has great potential," Jung said.

"It is twice more light-efficient than other technologies, has a wide viewing angle, consumes ultra-low power by the use of low-frequency driving technology, and is readable under all lighting conditions."

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