‘Green’ displays making more and more economic sense
“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, SVP, Displays, LEDs and Lighting for IMS Research.
At the "Green Technologies" market research conference here in conjunction with the Society for Information Display event here 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 approximately 30 percent at smaller sizes, but power requirements will no longer scale with screen size beyond 50 inches, resulting in a 40 percent reduction at 55 inches, according to Young.
"Plasma TVs will have a real problem meeting 5.3 over 50 inches," 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 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. Jung said that "EWD has great potential."
"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."
Energy efficiency is also being addressed in the OLED camp. Universal Display Corp., is enabling energy-efficient displays and lighting with its UniversalPHOLED technology and materials. "The continued enhancements in our UniversalPHOLED materials systems, including recent advances in our light blue system, as well as the further development of our novel RGB1B2 display architecture, can provide our customers with new opportunities for product differentiation and advantage," said Mike Hack, Universal Display’s Vice President and General Manager.
In an invited paper titled "High Efficiency Phosphorescent AMOLEDs: The Path to Long Lifetime TVs," Hack presented an analysis demonstrating that OLED TVs using phosphorescent OLEDs can be environmentally ‘green’ and consume less power than comparable AMLCDs. In addition, the use of phosphorescent OLEDs reduces operating temperature rise to extend display lifetime and reduce cost.
In a comparison of various display architectures, Hack highlighted added power consumption and lifetime advantages through the use of the company’s four sub-pixel architecture for OLED TVs. "The new architecture adds a light blue sub-pixel to the conventional red-green-blue (RGB) configuration. The performance of this RGB1B2 architecture has recently been improved through use of the company’s enhanced light blue materials system," said Hack.
Universal Display’s enhanced light-blue materials system achieves a luminous efficiency of > 47 candelas per Ampere at 1,000 candelas per square meter (cd/m2). Under accelerated test conditions, this new emitter system demonstrates an operating lifetime of approximately 20,000 hours, to 50 percent of an initial luminance of 1,000 cd/m2 – for a two times improvement over results reported last year.
Meanwhile Samsung Electronics won the Best In Show Award for Large Exhibits with its 70-inch UD 240Hz 3-D technology at the Society for Information Display conference here. "It’s an honor to win this very prestigious award, for such an innovative technology, especially when you consider those we were competing against,” said Jae Woo Park, Vice President, LCD Business, Samsung Electronics.
Samsung’s award recognizes the ultra definition (UD) resolution and a refresh rate of 240Hz on a 70-inch display prototype that is based on its oxide semiconductor TFT technology. It also recognizes the display’s immersive 3D images enhanced by Samsung’s differentiated technology and the UD resolution.
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