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Optoelectronics/Displays??

Flexible OLED display is rollable

Posted: 28 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:OLED? flexible display? LED?

From Sony Corp. comes a highly flexible OLED display that can be rolled around a pencil and continue to operate.

The 4.1-inch diagonal display is 80-microns thick and offers 432 by 240 by RGB pixels resolution at 121 pixels per inch. It is an organic LED full color display driven by an organic thin-film transistor matrix.

The key to the display is the use of a peri-Xanthenoxanthene (PXX) derivative with 8x the current modulation of conventional OTFTs. This was achieved due to the development of integration technologies of OTFTs and OLEDs on an ultrathin 20? thick flexible substrate together with soft organic insulators for all the insulators in the IC.

The panel is capable of reproducing moving images while being repeatedly rolled-up and stretched around a cylinder with a radius of 4-mm.

Sony has so far developed a prototype and said it would proceed with the development of a production process based on printing of organic materials dissolved in solvents. Sony said the displays are expected to yield thin, light-weight mobile devices with enhanced form-factor.

Sony's PXX derivative is stable under exposure to oxygen, moisture, light and heat and improves the current modulation by a factor of eight over conventional OTFTs based on pentacene. The roll-up capability is partly possible because the rigid driver IC chips are no longer required for the display.

The display has withstood more than 1000 cycles of repeatedly rolling-up and stretching the display without degradation in the display's ability to reproduce moving images, Sony said.

- Peter Clarke
EE Times





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