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SID 2010 roundup: Day 3
The standout products on day three of the SID 2010 conference is Universal Display’s new PHOLED display architecture with a unique four-color, sub-pixel design, which promises to drive commercial development of all-phosphorescent active-matrix OLEDs and Sony’s tiny rollable OLED display that can wrap around a pencil.
Universal Display Corp. (Ewing, N.J.) announced the development of an all-phosphorescent AMOLED display architecture that uses a novel four-color, sub-pixel design, which the company says has the potential to accelerate the commercial introduction of all-phosphorescent active-matrix OLEDs with enhanced power efficiency and extended lifetime.
The new pixel format adds a light blue sub-pixel to the conventional red-green-blue (RGB) configuration. Universal Display says the introduction of an energy-efficient, longer-lived, light blue sub-pixel can significantly extend the operational lifetime of an OLED display and reduce the display’s power consumption by as much as 33 percent, as compared to a RGB OLED display using a fluorescent blue sub-pixel. By adding a light-blue sub-pixel, the stress on the deep-blue sub-pixel is also lessened.
The company, in collaboration with Professor Jin Jang of Kyung Hee University and Samsung Mobile Display, demonstrated the new architecture in a 2.5-inch, all-phosphorescent AMOLED display.
Universal Display’s proprietary PHOLED technology and materials offer up to four times the efficiency of conventional OLED technology, according to the company, and can be found in a variety of cell phones, multi-media players and other display devices already on the market.
Also unique, Sony Corp. has demonstrated a super-flexible 80 um-thick, 4.1-in 121 ppi full-color OLED display, which can be wrapped around a thin cylinder. The organic thin-film transistor (OTFT)- driven panel is capable of reproducing moving images while being repeatedly rolled up around a cylinder with a radius of 4 mm with no degradation of the images even after 1,000 cycles.
Sony developed OTFTs with an original organic semiconductor material (a peri-Xanthenoxanthene — PXX — derivative) with eight times the current modulation of conventional OTFTs. As a result, the company was able to integrate the OTFTs and OLEDs on an ultra-thin 20-um-thick flexible substrate. Sony says the flexible on-panel gate-driver circuit with OTFTs eliminated the need for conventional rigid driver IC chips.
Sony says it will continue to work on the development of the solution/print-based process, which requires fewer process steps and consumes less materials and energy, compared to conventional silicon-based processes.
The company will also focus on improving the performance and reliability of its flexible organic displays to meet the small, lightweight form factor and durability requirements of mobile devices.
Here are the key specs of the OTFT-driven 4.1-inch OLED display.
–Number of pixels: 432 x 240 x RGB pixels
–Size of pixel: 210 um x 210 um
–Resolution: 121 ppi (pixels per inch)
–Number of colors: 16,777,216
–Peak Luminance: >100 cd/m2
–Contrast ratio: >1000:1
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