Sony Rollable OTFT-driven OLED Display

Sony reveals today another gadget of the feature, a super-flexible 80 μm-thick 4.1-inch 121 ppi OTFT color OLED display, which is flexible enough to be wrapped around a thin cylinder.

The display use Sony’s organic thin film transitors (OTFT) with an original organic semiconductor material (a PXX derivative) with eight times the current modulation of conventional OTFTs. By combining and integrates both technologies on an ultra-thin 20 μm thick flexible substrate (a flexible on-panel gate-driver circuit with OTFTs which is able to get rid of convetinal rigid driver IC chips interfering roll-up of a display) and soft organic insulators for all the insulators in the integration cuircuit, allowing this display to reproduce moving images while being repeatly rolled-up – around a cylinder with a radius of 4 mm – and stretched.


Sony will unveil the results of this development on May 27 at “SID (Society for Information Display) 2010 International Symposium” in Seattle, WA (May 23-28).

Sony Rollable OTFT-driven OLED Display

Specification of the OTFT

  • organic semiconductor : peri-Xanthenoxanthene(PXX) derivative
  • hole mobility : 0.4 cm2/Vs
  • current on/off ratio : 106
  • channel length : 5μm
  • threshold voltage : -5V

Specification of the rollable OTFT-driven OLED display

  • size of a panel : 4.1 inch wide
  • number of pixels : 432 x 240 x RGB pixels
  • size of a pixel : 210μm x 210μm
  • resolution : 121 ppi (pixels per inch)
  • number of colors : 16,777,216
  • peak luminance : >100 cd/m2
  • contrast ratio : >1000:1
  • minimum bending radius : 4 mm
  • driving scheme : 2T-1C voltage programming with OTFTs
  • thickness of a panel : 80μm

Source: Sony

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