Power consumption - Page 45

eMagin Corporation will begin taking orders for its SVGA 3DS OLED-XL microdisplay at next week’s Night Vision Conference in Washington, D,C. The company expects to begin shipping the product in the first quarter of 2008.

The SVGA-3DS microdisplay offers both analog and digital signal processing in a compact display (0.44-inch) with greater power efficiency. This high-density OLED-on-silicon microdisplay promises an affordable, easy-to-integrate solution for many virtual imaging systems. eMagin’s SVGA-3DS microdisplays eliminate the need for extra circuitry and components while allowing for a smaller display module design with increased functionality, with no increase in power consumption.

Specific improvements include increased pixel uniformity, improved color gamut, on-chip temperature sensor and compensation, and compatibility with both analog RGB and digital video signals. The 800 x 600-pixel array comprises triads of vertical sub-pixels stacked side by side to make up each 11.1 x 11.1-micrometer color pixel. Versatile timing controls accommodate a variety of video formats. On-board circuitry ensures consistent color and brightness over a wide range of operating temperatures.

National’s LM4510 is a synchronous high-voltage boost regulator that supports OLED displays which are much thinner and consume less energy than liquid crystal displays (LCDs). The LM4510 features up to 85 percent efficiency for longer battery life and is offered in a small LLP® package.

Technical Features of National’s LM4510 OLED Display Power Supply
National’s LM4510 is a current-mode, step-up DC-DC converter with a 1.2A internal NMOS switch designed to deliver up to 80 mA at 18V from a Li-Ion battery. The synchronous operation at heavy loads and non-synchronous operation at light loads allow it to achieve up to 85 percent efficiency for longer battery life in power-constrained applications. Moreover, the true shutdown isolation feature eliminates leakage current paths to ground in stand-by mode. The device reduces the total solution size and cost through elimination of an external Schottky diode and from a 3.2V input, delivering a current range from 18V to 5V. The system designer can optimize line and load transient responses using the external compensation network in a broad range of applications, such as USB power supply or OLED display bias. Finally, the LM4510 offers a very robust solution due to the feedback fault and short-circuit protection feature on the output. The LM4510 is available in a 10-pin thermally enhanced LLP® package.

The new material called E255a has a high colour saturation making it ideal for a broad range of product applications in single colour and full colour displays. The material also has a very high efficiency delivering high brightness at low power making it ideal for mobile product applications with either passive matrix or active matrix driving.

The University of Hong Kong has manufactured OLED demonstrators using E255a and has reported a device efficiency of 40 cd/A at 1000 cdm-2 with a very saturated green colour coordinate of (0.28, 0.64) which is wider than commercially available LCD products.

E225a will be available for customer sampling from January 2008 and can be deposited onto any desired substrate by vacuum coating methods.

In the past year, OLED makers, materials firms and others have become increasingly interested in new business opportunities that will be available as the result of OLED, phosphorescent and (to a lesser extent) carbon nanotube lighting. Interest in this new form of illumination is being driven by a number of factors ranging from its likely low power consumption to the fact that - unlike high-end displays - it can be built without any need for complex active matrix backplanes.

This is a new report that analyzes and quantifies the opportunities available in OLED and printed lighting. The report examines the factors driving the market as well as key trends in materials and manufacturing. The report analyzes the strategies of the main firms and research groups involved in this space as well as the likely commercial impact of various government funded projects in the U.S., Europe and Japan. In addition to discussing the devices themselves, this report also provides a forecast broken out by technology platform and application area in volume and value terms.

ON Semiconductor has introduced the NCP5810 - a 2 watt (W) dual output dc-dc converter that offers both positive and negative output. The device's output voltage accuracy, high switching frequency, and small package size makes it particularly suitable for powering a display driver in Active Matrix Organic Light Emitting Diodes (Active Matrix OLED or AMOLED) panel, an emerging display technology for portable applications.

Featuring high overall efficiency up to 85 percent at 1.75 megahertz (MHz) oscillator frequency, the NCP5810 dual output dc-dc converter delivers best-in-class performance. In order to complement the slim form factor of AMOLED display, the converter switches at the high 1.75 MHz frequency, allowing the use of small inductors and ceramic capacitors. Its ultra-thin package with 0.55 mm thickness allows the NCP5810 to fit into the thinnest portable design form factor. In addition, it preserves battery power in shut-down mode with true cut-off function that limits the leakage display current to typically 1 microamp (uA). Additionally, the NCP5810 features cycle-by-cycle peak current limit and thermal shut down protection.

Available in the ultra-thin 3.0 mm x 3.0 mm x 0.55 mm LLGA-12 package, the NCP5810 is budgetary priced at $1.20 USD per unit in 3,000 unit quantities.

OLED-T today announced a new patented host material for OLED displays that delivers significant performance benefits compared with existing materials. The host layer is a crucial layer in the make-up of an OLED display as it impacts its performance including efficiency and lifetime. The new OLED-T material, called E746, is targeted as a direct replacement and upgrade path for aluminium quinolate (Alq3), the host material most commonly used throughout the OLED industry.

OLED-T has developed E746 for OLED displays in the mobile market such as mobile phones and digital cameras where its power consumption and lifetime performance benefits are expected to deliver improved product performance.

In fluorescent red and fluorescent green customer OLED display devices, OLED-T’s E746 material outperforms Alq3 in terms of energy efficiency, colour co-ordinates, lifetimes and voltage drift. E746 enables OLED displays to be manufactured with a current efficiency increase of between 30% and 50%, a power efficiency improvement of as much as 45 to 80 per cent and a lifetime increase of 100 per cent for fluorescent red and 200 per cent for fluorescent green.

TMA is a technology which potentially can be incorporated into driver chips to bring active matrix capabilities to passive matrix displays. TMA reduces power consumption and enhances panel lifetime for a given pixel count in passive matrix displays. Measurements on small passive matrix displays that incorporated the TMA solution, demonstrated at least a 50% reduction in power consumption or exhibited double the display luminescence at the same power consumption.

he TMA driving system applies both to polymer and small molecule OLED displays. CDT is currently considering how to bring the technology to market in the shortest possible time. A working demonstrator has been created using individual electronic components, that exploit the new driver and image processing technologies. This will be developed further in the coming months. CDT is in discussion with OLED display producers and IC driver companies with a view to commencing design work for commercialising TMA as soon as possible.

Next Phase to Focus on Konica Minolta's Commercialization of All-Phosphorescent OLED Backlights and Other Lighting Products

Konica Minolta And UDC announced the strengthening of their collaboration to incorporate Universal Display's proprietary PHOLED(TM) phosphorescent OLED technology into Konica Minolta's white OLED devices. On June 30, 2006, Konica Minolta announced that it had successfully developed a white OLED with a power efficiency of 64 lumens per watt, which is four times the efficiency of standard incandescent bulbs. For this development, Universal Display's red and green PHOLED technology and materials have been used in conjunction with Konica Minolta's proprietary OLED technologies, such as its own blue phosphorescent materials and multi-layer design technologies.

Konica Minolta is currently accelerating its efforts to enable commercial manufacturing of white OLED devices for backlights in displays and for other lighting applications. These OLED devices are anticipated to use all phosphorescent materials.

Universal Display and Novaled presented a joint scientific paper at the International Society of Optical Engineering (SPIE) Optics and Photonics 2006 conference in San Diego, CA. The presentation detailed the achievement of a saturated red PHOLED™ phosphorescent OLED device with a luminous efficacy of 15 candelas per ampere (cd/A) and an operating voltage of less than 4 Volts (V) for a record power efficiency of 12 lumens per Watt (lm/W) all at 1,000 candelas per square meter (cd/m2) brightness.

This milestone was achieved through the combination of Universal Display's high-efficiency PHOLED™ phosphorescent OLED technology and materials with Novaled's low-voltage conductivity doped Novaled PIN-OLEDTM technology and transport materials.

Philips and Novaled reached a new record for the power efficiency of a white OLED, obtaining 32 lm/W with colour coordinates of 0,47/0,45 and a CRI of 88 at a brightness of 1000 cd/m2. That same device structure thereby simultaneously shows a lifetime of more than 20000 hours which is a major achievement for a future commercialization of the OLED technology for lighting applications.

The efficiency of the device was measured using an integrating sphere using only the forward emission cone of the OLED device without attaching any lens or any other volume type luminaire to the OLED device. This is the only method to reliably predict power efficiency values for large area lighting tiles.