Power consumption - Page 26

Japan Display (the new small/medium display maker that merged Sony, Hitachi and Toshiba's businesses) announced that it plans to start mass producing OLED displays for smartphones. First panel samples are expected by March 2013. In order to have an edge over Samsung, JD aims to achieve over 300 ppi and develop panels that are more efficient than Samsung's OLEDs. Analysts suggest that JD will try to secure Apple as a customer for their OLED panels.

Back in November there were reports that JD plans to accelerate OLED mass production with a $1.3 billion investment in OLED R&D (which probably includes pilot production plants), and later on invest a further $1.4 billion towards mass production. It was suggested that JD may convert their Mobara LCD plant (bought from Panasonic) to LTPS and later to AMOLED production.

Lumiotec released an interesting article that discusses the company's Multi-Photon Emission (MPE) stacked device structure and how it helps to achieve high luminance and long lifetime, their light out-coupling and encapsulation technologies and the company's mass production process. The paper also includes a discussion on the development of their next generation panel which uses phosphorescent materials provided by Universal Display Corporation to improve the efficiency.

Here's our own review of Lumiotec's Hanger and Vanity OLED lamps, and here's our review of the company's first-gen OLED lighting panel. Here are a couple of videos showing Lumiotec's panels and lamps:

Last week we reported that Sumitomo Chemical is planning to start mass producing OLED lighting panels later in 2012 based on their PLED technology in a ¥5-6 billion ($60-70 million) investement. Now Sumitomo finally announced that they plan to unveil panels at the L+B 2012 exhibition, and also unveiled a web page with lot's of info on their PLED lighting program. It seems that the company will commercial PLED panels for "decorative lighting" in 2013, and for general lighting in 2015.

In L+B2012 Sumitomo will show new PLED panels that are about 10 centimeters square each. There will be panels in sixty different colors, which are made using printing technology (all layers except the electrodes). The booth was designed by world-renowned Japanese lighting designer Motoko Ishii, with the theme The Colors of Japan The Colors of Harmony, in an innovative attempt to replicate—by means of lighting—the elegant and refined colors of ancient Japan in a modern day setting of a Japanese traditional tearoom. Here's what the booth will look like:

Philips released a new roadmap for their OLED lighting products. The company decided to split its OLED offering into two families - one for decorative lighting and one for performance lighting. The decorative panels are normally reflective in the off state, and Philips will offer transparent ones as soon as next year. Color tunable and transparent panels will arrive in 2018. And Philips predicts that by then it'll be able to offer 1x1 meter panels! It will sure be interested to see those large, flexible, light emitting panels...

Decorative lighting roadmap

The downside of the decorative panels is the efficiency: In 2015 these panels will offer only 15 lm/W (that's only marginally better than an incandescent lamp). By 2018, those large flexible panels will offer 35 lm/W - which is still very low (Fluorescent lamps today offer 70-100 lm/W).

Universal Display and Acuity Brands presented advances in their stripes white OLED architecture project. A stripes OLED is made from thin stripes of red, green and blue OLEDs. When you put a diffuser panel on top, it appears white. The stripes architectural results in efficient panels, that are also color tunable (2500-4000K).

UDC reports that the project is proceeding well - and in fact the pixel performance exceeds the project's goal. They fabricated the first 15x15 cm panel samples already and both companies are on target to deliver the actual luminaries in 2012 (which are based on the same design as the Kindred and the Revel - the lamps that use LG Chem's OLED panels). UDC is also working to further optimize the panel's performance.

We just got word from LG Chem that the company finished development of their first OLED lighting panel, and have started mass production. The "type 1" panel, or the LG-OLED-041 is a 100x100 mm square panel that features 4,000K, CRI>80, 45 lm/W and 10,000 hours lifetime (LT70) at 3,000 nits. The active emitting panel is 90x90 mm, and the whole panel is 2.44 mm thick (including the optical film and PCB. The OLED itself is 1.84 mm).

LG Chem is already developing the 2nd generation (or "type 2") panel which will up the efficiency to 60 lm/W and the lifetime to 15,000 hours. The size will be the same, but the color will be 3,500K. LG Chem will start mass production of type 2 panels in 2Q 2012. LG Chem further says that it decided to offer these new panels at "lower prices" - although we do not know the actual price yet.

A modder developed a black-themed version of Google apps (he called this Black Google Apps) that is a much more battery friendly on OLED mobile phones. The application are not just "darker", they are inverted (see the image below).

This idea isn't new of course - when Microsoft developed the WP7 operation system they assumed most phones will sport OLED displays and this effected the user interface design.

STMicroelectronics announced the STOD13AS - a new miniature AMOLED power supply chip. The new chip is produced using ST's innovative Silicon On Insulator (SOI) process technology, which ensures outstanding energy efficiency and results in longer battery life. The chip offers high immunity to cellphone-communication noise - and thus minimizes flicker on the display.

ST explains that the new chip is better than the predecessor (the ST0D03A) because it integrates the step-up and inverting DC/DC converters needed to generate the positive and negative supplies on the same chip. It also features increased display-driving capability as well as additional short-circuit and overload protection modes to maximize ruggedness and reliability. When the display is not used, the new chip can be completely turned off which saves more power, and it also features pulse-skipping operation that optimizes efficiency when the display is consuming minimal power.

Digitimes Research posted about Philips lighting unit, and they said that the company's goal is to reach an efficiency of 120 lm/W for their OLED lighting panels by 2019. We talked to Philips and indeed they confirm this number. Philips is gearing up to start production in their new Aachen production plant which will increase production capacity tenfold and will also lower prices considerably.

This is quite an increase from the panels Philips make today. The regular Lumiblades offer around 12 lm/W, while the Lumiblade Plus (a phosphorescent panel, developed by Konica Minolta and produced by Philips) offers 45 lm/W. We reviewed Philips' new Lumiblades recently, here's the short hands on video:

Researchers from Cambridge University and Ignis Innovation developed a new energy harvested that sits inside a mobile phone with an OLED display and harvests energy from the light that is projected to the display's sides. The researchers say that up to 64% of the light is lost in typical OLED displays - much of it projected to the edges of the display. The idea is simple - to place an array of thin-film hydrogenated a-Si solar cells around the OLED. These cells can also harvest ambient light.

The researchers made a complete system design - instead of charging the battery with the power generated (which would be quite complex) they added a supercapacitor for intermediate energy storage. They say the system achieves an average efficiency of 11% and peak efficiency of 18%, while the PV array converts around 5% of the ambient light to electricity. They say that on a typical 3.7" OLED display the maximum power output is 5 milliwatts. Useful, but not significant compared to the phone's power needs, so it's not clear whether this is worth the extra cost, size and weight.