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Optoelectronics/Displays  

'Green' display power efficiency improved by enhanced LEDs

Posted: 26 May 2011     Print Version  Bookmark and Share

Keywords:LED  green technology  display  energy efficency 

OLED displays
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 20,000hrs, 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 (convert to mm except for displays) UD 240Hz 3D technology at the Society for Information Display conference. "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 (convert to mm except for displays) 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.

- Nicolas Mokhoff
  EE Times


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