A woman takes photos of white and blue light emitting diodes (LED) used as Christmas decorations at Tokyo Midtown in Tokyo November 20, 2009. REUTERS/Toru Hanai (JAPAN SOCIETY) 

A man takes photos of white and blue light emitting diodes (LED) used as Christmas decorations at Tokyo Midtown in Tokyo November 20, 2009. REUTERS/Toru Hanai (JAPAN SOCIETY IMAGES OF THE DAY) 

A couple looks at white and blue light emitting diodes (LED) used as Christmas decoration at Tokyo Midtown in Tokyo November 20, 2009. REUTERS/Toru Hanai (JAPAN SOCIETY) 

A visitor looks at Sony Corp's 0.3mm thick OLED (Organic Light Emitting Diodes) panel at the Display 2009 in Tokyo April 15, 2009. The exhibition goes on till April 17. The products is displayed in glass case. REUTERS/Kim Kyung-Hoon (JAPAN SCI TECH) 

A mobile phone with a foldable AMOLED screen is displayed at an Organic Light Emitting Diode (OLED) association booth during a media preview at the 2009 International Consumer Electronics Show (CES) in Las Vegas, Nevada, January 7, 2009. The consumer technology trade show begins January 8 and is expected to attract 2,700 exhibitors and 130,000 attendees. REUTERS/Steve Marcus (UNITED STATES) 

People look at white and blue light emitting diodes (LED) used as Christmas decoration at Tokyo Midtown in Tokyo in this November 16, 2008 file photo. From Britain to China, governments and retailers are dreaming up innovative ways to persuade people to part with cash that bankers won't lend. On the bright side, for the shopper who has cash to spare, Christmas looks like being a reasonable deal. The worry is consumers will simply pay off debts. And - sensing prices could fall yet further - some are holding back in the hope of scooping bigger bargains later. To match feature FINANCIAL/RETAIL-CONSUMERS REUTERS/Yuriko Nakao/Files (JAPAN) 

People look at white and blue light emitting diodes (LED) used as Christmas decoration at Tokyo Midtown in Tokyo November 16, 2008. REUTERS/Yuriko Nakao (JAPAN) 

A visitor under an umbrella walks past white and blue light emitting diodes (LEDs) used as Christmas decorations at Tokyo Midtown in Tokyo November 16, 2008. REUTERS/Yuriko Nakao (JAPAN) 

A couple looks at white and blue light emitting diodes (LED) used as Christmas decoration at Tokyo Midtown in Tokyo November 17, 2007. REUTERS/Yuriko Nakao (JAPAN) 

A visitor looks at white and blue light emitting diodes (LED) used as Christmas decoration at Tokyo Midtown in Tokyo November 17, 2007. REUTERS/Yuriko Nakao (JAPAN) 

A couple looks at white and blue light emitting diodes (LED) used as Christmas decoration at Tokyo Midtown in Tokyo November 17, 2007. REUTERS/Yuriko Nakao (JAPAN) 

A model poses with Sony's ultra-thin OLED displays at the CEATEC technology trade show in Chiba, Japan October 2, 2007. Sony Corp said it will launch an ultra-thin flat TV in December, the world's first television based on organic light-emitting diode (OLED) technology into an $82 billion market dominated by LCD and plasma models. REUTERS/Michael Caronna (JAPAN) 

A photographer takes a photo of a Sharp LCD TV at a news conference in Tokyo August 22, 2007. Sharp said it has developed the world's thinnest and lightest LCD TVs with enhanced picture quality, in a pre-emptive move before the release of organic light-emitting diode TVs, known for their thin displays and crisp images. REUTERS/Michael Caronna (JAPAN) 

Models Martha Popova (L) and Jeffrey Lippold stand with jackets, designed by Barbara Layne and woven with light emitting diodes, microcontrollers and sensors that add a third scrolling message when the wearers hold hands, during a fashion exhibition at SIGGRAPH (Special Interest Group for Computer GRAPHics) 2007 in San Diego, California August 6, 2007. The exhibition showcased innovated and interactive works in fashion inspired by new technology by international designers. REUTERS/Mike Blake (UNITED STATES) 

A worker touches mini-tomato leaves which are being grown under light-emitting diodes (LEDs) during a photo opportunity at Pasona O2, an underground farming facility in Tokyo July 25, 2007. The company hopes the facility will promote interest in agricultural work and demonstrate modern and alternative farming technology to city dwellers. REUTERS/Yuriko Nakao (JAPAN) 

A model poses in a LED dress at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. REUTERS/Kim Kyung-Hoon (JAPAN) 

A model poses in a LED dress at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. REUTERS/Kim Kyung-Hoon (JAPAN) 

A model in a LED dress walks at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. This picture is taken in slow shutter. REUTERS/Kim Kyung-Hoon (JAPAN) 

A model poses in a LED dress at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. REUTERS/Kim Kyung-Hoon (JAPAN) 

A model poses in a LED dress at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. REUTERS/Kim Kyung-Hoon (JAPAN) 

A model shows the inside of a LED dress at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. REUTERS/Kim Kyung-Hoon (JAPAN) 

A model poses in a LED dress at its demonstration in Tokyo June 7, 2007. The dress, with light-emitting diode devices installed inside, was designed by Swarovski and Hussein Chalayan and will be available in Japanese market from fall and winter season in this year. REUTERS/Kim Kyung-Hoon (JAPAN) 

The "Geo-Cosmos", covered with one million LEDs (light emitting diodes), displays a simulation of future global warming at the National Museum of Emerging Science and Innovation (Miraikan) in Tokyo April 5, 2007. U.N. Secretary-General Ban Ki-Moon recently warned that climate change posed as much danger to the world as war, adding that he would make it the focus of talks with industralised nations including the United States and Japan. To match feature EXHIBITION-JAPAN-EARTH/ REUTERS/Yuriko Nakao(JAPAN) 

The "Geo-Cosmos", covered with one million LEDs (light emitting diodes), displays a simulation of future global warming at the National Museum of Emerging Science and Innovation (Miraikan) in Tokyo April 5, 2007. Global warming could cause more hunger in Africa and melt most Himalayan glaciers by the 2030s, according to a draft U.N. report due on Friday which also warns that the poorest nations are likely to suffer most. REUTERS/Yuriko Nakao(JAPAN) 

The "Geo-Cosmos", covered with one million LEDs (light emitting diodes), displays a simulation of future global warming at the National Museum of Emerging Science and Innovation (Miraikan) in Tokyo April 5, 2007. Global warming could cause more hunger in Africa and melt most Himalayan glaciers by the 2030s, according to a draft U.N. report due on Friday which also warns that the poorest nations are likely to suffer most. REUTERS/Yuriko Nakao(JAPAN) 

A Pasona O2 employee cares for a vegetable which is being grown using light from light-emitting diodes (LED) during a photo opportunity at Pasona O2, an underground farming facility that promotes interest in agricultural work and demonstrates modern and alternative farming technology, in Tokyo February 1, 2007. A draft of a scientific survey, which draws on research by 2,500 scientists from more than 130 countries, projects a big rise in temperatures this century and warns of more heatwaves, floods, droughts and rising sea levels linked to greenhouse gases released mainly by the use of fossil fuels. REUTERS/Kim Kyung-Hoon (JAPAN) 

A Pasona O2 employee cares for a vegetable which is being grown using light from light-emitting diodes (LED) during a photo opportunity at Pasona O2, an underground farming facility that promotes interest in agricultural work and demonstrates modern and alternative farming technology, in Tokyo February 1, 2007. A draft of a scientific survey, which draws on research by 2,500 scientists from more than 130 countries, projects a big rise in temperatures this century and warns of more heatwaves, floods, droughts and rising sea levels linked to greenhouse gases released mainly by the use of fossil fuels. REUTERS/Kim Kyung-Hoon (JAPAN) 

A Pasona O2 employee cares for a vegetable which is being grown using light from light-emitting diodes (LED) during a photo opportunity at Pasona O2, an underground farming facility that promotes interest in agricultural work and demonstrates modern and alternative farming technology, in Tokyo February 1, 2007. A draft of a scientific survey, which draws on research by 2,500 scientists from more than 130 countries, projects a big rise in temperatures this century and warns of more heatwaves, floods, droughts and rising sea levels linked to greenhouse gases released mainly by the use of fossil fuels. REUTERS/Kim Kyung-Hoon (JAPAN) 

A Pasona O2 employee cares for vegetables which are being grown using light from light-emitting diodes (LED) during a photo opportunity at Pasona O2, an underground farming facility that promotes interest in agricultural work and demonstrates modern and alternative farming technology, in Tokyo February 1, 2007. A draft of a scientific survey, which draws on research by 2,500 scientists from more than 130 countries, projects a big rise in temperatures this century and warns of more heatwaves, floods, droughts and rising sea levels linked to greenhouse gases released mainly by the use of fossil fuels. REUTERS/Kim Kyung-Hoon (JAPAN) 

A Pasona O2 employee cares for a vegetable which is being grown using light from light-emitting diodes (LED) during a photo opportunity at Pasona O2, an underground farming facility that promotes interest in agricultural work and demonstrates modern and alternative farming technology, in Tokyo February 1, 2007. A draft of a scientific survey, which draws on research by 2,500 scientists from more than 130 countries, projects a big rise in temperatures this century and warns of more heatwaves, floods, droughts and rising sea levels linked to greenhouse gases released mainly by the use of fossil fuels. REUTERS/Kim Kyung-Hoon (JAPAN) 

A mobliBLU Boxon audio/video player by Hyun Won Inc. plays a music video during the 2007 International Consumer Electronics Show (CES) in Las Vegas, Nevada January 9, 2007. The player uses an OLED (organic light-emitting diode) screen. REUTERS/Steve Marcus (UNITED STATES)