Power consumption - Page 43

OLED-T today announced the launch of its low temperature organic electron injector material EI-111-2Me. OLED displays are manufactured from a sandwich of different materials including the electron injector layer. This layer is responsible for injecting electrons from the cathode into the OLED structure, the efficiency of which is critical to the performance of the display.
 
EI-111-2Me is a low temperature replacement for Lithium Floride (LiF), the material typically used by OLED display manufactures as the electron injector layer within an OLED display. Low temperature OLED materials reduce the cost of manufacturing and the potential damage to the underlying layers of the display, thereby improving the lifetime and voltage drift over the lifetime of the OLED device.

EI-111-2 Me enables display manufacturers to improve the efficiency and lifetime of an OLED display, as well as reduce the operating voltage and minimising voltage drift. In customer trials using EI-111 as a direct replacement for LiF, display efficiency improved by 25 per cent and lifetime by 10 per cent.

EI-111-2 Me evaporates at 200oC as opposed to LiF which requires a temperature of over 600oC, making the deposition faster and more controlled and introducing the potential of using plastic as a substrate rather than glass. The reduced manufacturing temperature also eliminates the need for costly evaporation crucibles reducing the overall cost of manufacturing.

As the market for OLED matures display manufacturers are focused on reducing cost throughout the display supply chain. EI-111-2Me provides companies with a significant opportunity to reduce cost at the same time as improving the performance of OLED displays, said says Myrddin Jones, Chief Executive Officer at OLED-T.

OLED-T is sampling of EI-111-2Me with immediate effect and will commence volume production from the fourth quarter of 2008. The new material complements OLED-T’s already strong OLED material portfolio.

Chinese chemists have discovered a soluble and simple-to-make iridium complex that boosts the efficiency of organic light-emitting diodes (OLEDs). This discovery could simplify the manufacture, and reduce the cost, of OLEDs for a wide range of future applications.

A team led by Biao Wang at Sun Yat-Sen University, Guangzhou, China, has solved these problems by developing a new iridium complex that is both easy to make and highly soluble, potentially allowing it to be sprayed onto a surface.

The secret to the solubility lies in the choice of ligand: sterically-hindered phenolic groups. The researchers report that their complex, which combines iridium with three phenyl phthalazine-derived ligands, was 'unexpectedly' synthesised under mild conditions with no catalysts, simply from iridium chloride.

LG Chem and Universal Display Corporation today announced that they have signed a non-exclusive joint development agreement to accelerate the commercialization of high-performance OLED materials for use in OLED displays and lighting products. The collaboration will focus on combining LG Chem's electron transport and hole injection materials with Universal Display's phosphorescent OLED emitter materials and technology.

Universal Display's proprietary PHOLED technology offers up to four times higher efficiency than conventional OLED technology - a feature that is very important for today's battery-operated cell phones and other portable devices, as well as for tomorrow's large-area TV's and solid-state lighting products.

Dr. Karsten Heuser, Director of OLED Lighting Technology at OSRAM Opto Semiconductors, is pleased with the excellent intermediate results. Our development team has reached a real milestone for warm white OLEDs with efficiency of 46 lm/W (CIE of 0.46/0.42 measured in the integrated sphere) and a 5,000-hour lifetime, at a brightness of 1,000 cd/m². With these significant increases, flat OLED light sources are approaching the values of conventional lighting solutions and are therefore becoming attractive for a wide variety of applications.

The color rendering index (CRI) of the almost 100 cm² prototype is 80. By March 2009, OSRAM researchers expect that a demonstrator for an energy-saving flat OLED light module comprising several tiles will be able to deliver an overall luminous flux of 500 lm from a power consumption of less than 10 W.

With their pleasant diffused light the color of which can be individually controlled OLEDs will enhance premium lighting design elements such as light tiles that can be attached to any surface. OLED light sources will be particularly welcome where their special properties as flat light sources offer a high quality of light and make a real impression in illuminated wall coverings, atmospheric canopies of light, and light partitions. For widespread applications it will be necessary to produce efficient OLEDs in large numbers at reasonably low cost an essential objective of the OPAL research project.

This breakthrough achievement in OLED lighting is a result of the OPAL research project (Organic Phosphoresce Diodes for Applications on the Lighting Market), an initiative launched by the German Federal Ministry for Education and Research (BMBF) and coordinated by OSRAM.

Smarthouse claims that Toshiba delayed their OLED TV because of their high power consumption. If you check Sony's XEL-1 you see that the power consumption is higher than LCD or plasma. Sony admits that it will take time for them to lower the consumption - and that's only one of the tasks before their engineers before we get a commercial large sized OLED TV.

Toshiba says they want to produce only efficient TVs - in any technology, so OLEDs had to be delayed.

Summary:

• Red phosphorescent emitter functions optimally with Novaled’s proprietary technology for highly power-efficient OLEDs


• Delivers lifetime of 50,000 hours at initial brightness of 1,000 cd/sqm


• Supports market trend toward high-performance, low-voltage OLED devices

Ciba has developed a deep red phosphorescent OLED emitter that functions optimally in combination with the Novaled PIN OLED™ technology, delivering a lifetime of 50,000 hours at an initial brightness of 1,000 cd/sqm. The new material supports the market trend toward high-performance, low-voltage OLED devices for display and lighting applications.

We want to provide the market with efficient phosphorescent materials, says Rolf Drewes, Global Head of Business Line Electronic Materials at Ciba. In this project, we are developing the full color range of emitters compatible with Novaled’s proprietary OLED technology. Our deep red, the first to become commercially available, offers customers not only long-lifetime performance but also excellent thermal stability. Green and blue are now in progress.

Phosphorescent emitter materials together with low-voltage devices are mandatory for the future of the OLED industry, and Novaled is very pleased to see a key industry player developing such materials, adds Gildas Sorin, CEO of Novaled AG. This deep red phosphorescent material provides a long lifetime at a lowest operating voltage of 3.3 V as well as good power efficiency of 8.1 lm/W, making it suitable for displays as well as for completely new lighting applications. OLED technology even has potential to surpass the efficiency of energy-saving bulbs.

Made of thin organic material layers only a few nanometers thick, OLEDs are semiconductors that emit light in a diffuse way to form an area light source. In 2006, Ciba and Novaled entered an industrial collaboration to create organic dopant and transport materials for the Novaled PIN OLED™ technology, which enables highly power-efficient OLED performance.

OLED displays are manufactured from a sandwich of different materials including the electron transport layer. This layer is critical to the efficiency, voltage, and lifetime of the total display based on the electron conductivity performance of the material.

E278ST has been developed as a like-for-like replacement in manufacturing lines for aluminium quinolate (Alq3), the electron transport layer most commonly used throughout the OLED industry.

E278ST provides significant technical and performance benefits compared with Alq3. The new electron transport material has lower toxicity, lower voltage, higher electroluminescent efficiency, longer lifetime and lower voltage drift.

In customer trials, OLED-T has demonstrated a two-fold increase in device lifetime and a 25 per cent reduction in device voltage. A fluorescent red device’s voltage was reduced from 8V to 6V at 500 cd/m2 and showed a 20 per cent power efficiency improvement. Voltage drift was reduced by 25 per cent over the first 500 hours of operation.

The new material is organic and contains no metals. The new material complements OLED-T’s already strong OLED material portfolio.

E278ST offers superior performance as an electron transport material in both passive matrix and active matrix OLED displays compared with existing materials. It can be used as a direct replacement and upgrade path for aluminium quinolate, ensuring that display manufacturers can gain benefits using existing manufacturing processes, said Myrddin Jones, CEO, OLED-T.

OLED-T will begin customer sampling of E278ST from the second quarter of 2008 and will commence volume production from the fourth quarter of 2008. The new material complements OLED-T’s already strong OLED material portfolio.

As we reported last week, Dialog Semiconductor has announced an interesting new technology called SmartXtend. The technology gives PMOLED displays a boost in terms of video quality and performance - they claim it will be just ilke AMOLED, at a much lower cost.

Now we got some more information from them, attached below. The summary -

"SmartXtend™ reduces peak current by driving more than one row at a time. In particular, each video frame is decomposed into two sub-frames. During the first of these sub-frames the rows are driven two at a time with the same data. That is, a lower peak current is applied over a longer period of time. During the other sub-frame ‘corrective’ data is added to each row to give each pixel its individual color.

Dialog Semiconductor is the first to have found a way to perform the necessary calculations in a cost effective manner suitable for application to low power, mobile devices. Using this driving scheme SmartXtend™ can reduce peak current through each diode by up to 30 percent. For example, a PMOLED panel driven with the conventional scheme requires about 150uA per anode, whereas only 100uA is required to drive the same panel when SmartXtend™ is used."

Dialog also claim they can reduce power consumption - "SmartXtend™ reduces average power consumption using a number of proprietary techniques that reduce the number of pre-charge cycles, the current and the voltage. Using these techniques SmartXtend™ can reduce power of the whole display subsystem by up to 30 percent."

In an interview with C|Net, Canon's "digital camera guru" made some interesting remarks about OLEDs -

"It was demonstrably brighter, had better color accuracy, and lower power consumption." We're looking to implement OLED in all our consumer products: digital still cameras, camcorders, and inkjet printers.