Power consumption - Page 42

At the end of the project period, the OLLA project consortium presents its final milestone: the basic technology for a white OLED light source, with an efficacy of 50.7 lumens per watt at an initial brightness of 1.000 cd/m² based on the Novaled PIN OLED technology. The OLLA project is a joint basic research consortium, headed by Philips Lighting.

The OLED technology is generating a novel and very attractive class of solid-state light sources, which are flat, thin, and very lightweight. Due to its freedom of design, OLED lighting technology offers many possibilities for new lighting applications achieving substantial energy savings. Within OLLA 24 partners of 8 European countries have been working closely together developing OLED technology for lighting purposes with the goal to reach an efficacy of 50 lumens per watt combined with a lifetime of over 10.000 hours at 1.000 cd/m2 initial brightness.

Philips Research and Novaled, together with the partners reached the project targets in efficacy, color rendering and brightness. The lifetime of the Novaled device even exceeded the promised value by one order of magnitude.

The Novaled PIN technology has the potential to further improve the power efficiency. It’s in line with the technology roadmap that in the near future some 100 lm/W OLEDs will be achievable, adds Dr. Martin Vehse from Novaled.

Collecting all light of the device in a laboratory set-up with a macro extractor, we measure even more than 80 lumens per Watt, comments Dr. Volker van Elsbergen,
Philips Research, the achievement. "This shows that one of the keys to higher efficiencies will be better light outcoupling technologies. \

Besides the record values listed above, the OLLA project delivered the first large sized ITO-free OLEDs, the first large-area printed OLEDs and several ICT demonstrators. All demonstrators were on show last Thursday on a public event in Eindhoven.

Philips, Osram Opto Semiconductors, Siemens, Novaled and Fraunhofer IPMS will continue the development of OLED lighting technology in a follow-up project. Within this new OLED100.eu project, the efficiency, lifetime and size of OLEDs will further increased.

Universal Display Corporation today announced that the company has successfully demonstrated a record-breaking white OLED with a power efficacy of 102 lumens per watt (lm/W) at 1000 cd/m2 using its proprietary, high-efficiency phosphorescent OLED technology.

Just last month at the Society for Information Display Symposium, Universal Display announced a new record of 72 lm/W. Since then, Universal Display has continued to make significant advances in this area achieving yet another major milestone toward commercialization. The milestone also demonstrates the potential of white OLEDs to offer significant energy savings and environmental benefits to end users around the world. For the first time, white OLEDs have surpassed the power efficacy of the two incumbent indoor lighting technologies - incandescent bulbs are less than 15 lm/W and most fluorescent lamps are 60 - 90 lm/W.

Funded in part by the U.S. Department of Energy (DOE) through its Solid-State Lighting initiative, Universal Display’s 102 lm/W milestone is a significant achievement toward the DOE's roadmap goal of a 150 lm/W commercial OLED light source by 2015.

This WOLED light source also offers a pleasing white emission with a color rendering index (CRI) of 70 and a coordinated color temperature (CCT) of 3900 Kelvin. This all-PHOLED structure uses complementary materials from Universal Display's collaboration partners at LG Chem and Nippon Steel Chemical Company.

Through the use of Universal Display’s PHOLED technology, power-efficient white OLEDs have the potential to reduce energy consumption dramatically and to lower the amount of by-product heat, which creates additional energy and environmental burdens. White OLEDs are also environmentally benign, especially compared to mercury-containing fluorescent lamps and newer compact fluorescent lamps (CFLs). It has been estimated that white OLEDs could worldwide save well over $20 billion in electric costs and over 9 million metric tonnes of carbon emissions from the U.S. alone by 2016.

In June 2008, I had the chance of interviewing Dr. Geoff Williams, Topless's project manager. Geoff has a PhD from University of Durham, and later worked in Philips Displays and he now works in Thorn lighting.

Merck KGaA announced today that it is launching several new OLED materials, including a blue singlet emitter (SEB series) that features ultra deep blue color coordinates. Measured in solvent, this dopant shows a color as deep as CIE(x;y) 0.15/ 0.09 with a full width half maximum (FWHM) of only 54 nm.

Merck said that in a bottom emission OLED device, an external quantum efficiency (EQE) in excess of 5.6% and color coordinates of 0.15/ 0.10 can be achieved with this new material. The stable material performance at high driving current and high temperatures makes the material ideal for passive matrix based automotive and mobile display applications. In active matrix top emission devices, the material allows panel-makers to achieve a high NTSC color gamut while drastically reducing power consumption and increasing product lifetime.

Merck also has developed a new light blue dopant for two color white or monochrome OLED applications. At CIE(x;y) 0.14/0.27, this material shows outstanding efficiency (7% EQE and 12.5 cd/A @ 1000cd/m²) and excellent lifetime above 36000h at 1000cd/m² for a basic bottom emission device structure.

CDT, Sumitomo and Novaled plan to co-develop hybrid OLED devices combining both new polymer emitting layers and doped electron transport layers. It is expected that these hybrid devices will offer further improvements in power efficiency without additional manufacturing complexity. The parties have reached an agreement on how IP generated during the JDA will be handled. Further, Novaled will grant a license to CDT enabling CDT to add necessary Novaled device IP to its existing and future licenses. Each company will remain responsible to market its own materials resulting from this co-development.

CDT continues to focus its effort on supporting the PLED supply chain and is pleased to be involved in yet another joint development project which has the potential of bringing new materials and improved device performance to our licensees, says David Fyfe, CEO of CDT.

UDC describes a new simplified WOLED architecture that represents an important milestone toward the achievement of cost-effective OLEDs for lighting applications. Offering a warm white color with CIE coordinates of (0.45, 0.46) and 30 lumens per Watt (with outcoupling), this WOLED device boasts an extremely long operating lifetime, exceeding 200,000 hours at 1,000 cd/m2, and may be suitable for a variety of entry lighting products.

Dr. D’Andrade will also report on a new white OLED with record-breaking power efficacy of 72 lumens per Watt. Both devices use transport and injection materials provided by Universal Display’s collaboration partner, LG Chem.

This work was funded, in part, by the U.S. Department of Energy (DOE) through its Small Business Innovation Research (SBIR) program. Under the SBIR program and the Solid State Lighting Initiative, the DOE is working to accelerate advances in OLEDs as an energy-efficient, solid-state lighting technology. The DOE views OLEDs as a pivotal emerging technology that promises to fundamentally alter lighting in the future. Through the use of Universal Display’s PHOLED technology, WOLEDs have the potential to meet the DOE’s future performance targets, including a power efficiency of 150 lumens per Watt, in an exciting new thin form factor.

Sony has given an interesting presentation at SID. It seems like that the power efficiency depends on the TV program. In most programs OLED fares better than LCDs. (see the slide photo to the right)

Yoshito Shiraishi, general manager of E-Products and Business Development Department, TV Business Group, Sony, highlighted the superiority of OLED, saying, "OLED has many advantages over LCD."

eMagin Corporation is showcasing the latest innovations in power-efficient OLED microdisplays at this year's Society for Information Display Conference. eMagin is also showcasing its microdisplay portfolio and subsystems in rugged commercial products and modules which meet the needs of near-eye applications ranging from PC gaming to night-vision headsets and scopes to mobile command and control communications and training and simulation.

"Our growing portfolio of OLED microdisplays deliver high resolution, flicker-free images which work effectively in adverse conditions such as extreme temperatures and high-vibration conditions with extremely high power efficiency," noted Susan Jones, executive vice president and chief business/strategy officer, eMagin Corporation. "Our new cell architecture and OLED-XL technology provide the cornerstone for even more advanced microdisplay products."

Products featured at eMagin’s booth include:

SVGA+ Rev3 OLED-XL microdisplay, the most power efficient OLED solution for near-eye personal viewer applications. The SVGA+ Rev3 display uses less than 115 mW power in monochrome, such as for thermal imaging applications, and lower than 175 mW at 400 cd/m2 for full color video. This new microdisplay has simpler calibration over temperature and is ideal for demanding binocular luminance and color matching. It also shares all the functional and design characteristics of eMagin’s original SVGA OLEDs, already proven in military and first-responder systems, responding instantly at temperatures as low as -40 degrees C.

SXGA OLED microdisplay, the best combination of high resolution and low power requirement. eMagin is previewing features of its SXGA (1280 x 1020 pixels) microdisplay. The next generation SXGA OLED microdisplay, targeted for introduction next quarter, offers both analog and digital signal processing in a compact package (0.77-inch diagonal active area) requiring less than 200 mW under typical operating conditions of 400 cd/m2, full-color. Design enhancements include increased pixel uniformity, improved color gamut, on-chip temperature sensor and compensation, and compatibility with both analog RGB and digital video signals. This high-density OLED-on-silicon microdisplay promises an affordable, easy-to-integrate solution for many virtual imaging systems.

Idemitsu Kosan and Sony announced the achievement of 28.5% internal quantum efficiency (IQE) in deep blue fluorescent OLED devices, the world's highest level of luminous efficiency for this technology.

This ground-breaking development is a result of Idemitsu's advanced OLED material technologies and Sony' OLED device expertise, brought together by the two companies' joint development agreement (established in November 29th, 2005). This joint agreement has led to the development of a wide range of high-performance OLED materials that have been incorporated in Sony products, and going forward both Idemitsu and Sony will also consider various practical applications for this newly developed, world-leading blue OLED technology. 

Techon has posted an interesting discussion with Novaled's CEO.

Highlights:

• Our goal is to improve the luminance efficiency to 100lm/W, which, I believe, can be achieved in 2 years.


• The key feature of OLED lighting equipment is the superior energy efficiency due to the high luminance efficiency


• OLED is the direct evolution of LCD panels, not a revolution against them