Research probes flexible OLEDs

The Holst Centre and imec have launched a research program on next-generation flexible OLED (organic light emitting diode) displays.

It builds on their track record and a base of existing research partners in related fields such as organic and oxide transistors and flexible OLED lighting. The primary aim of the program is to develop an economically scalable route to high-volume manufacture of flexible active-matrix OLED displays. The shared program will bring together partners to tackle challenges such as high resolution, low power consumption, large area, outdoor readability, flexibility and light weight.

Today, OLED displays are small and mobile and used in applications such as smartphones and tablet PCs. They are characterised by a strong contrast compared with conventional LCDs due to the fact that OLED pixels emit only when activated, achieving a more intense black.

OLEDs also have a faster response time, eliminating image lag. OLEDs can also consume less power, depending on use, while providing better contrast and viewing angle than conventional LCDs. They are also much simpler in design and contain fewer components compared with LCDs, enabling substantial process cost reductions.

The aim of the program is to work towards flexible, high-resolution OLED displays. The program will tackle the individual challenges towards the next-generation of OLED displays: a mechanically flexible encapsulation film and TFT backplane; and printed, high-efficiency OLEDs.

New materials and processes that allow cheaper production, better quality, lower power, more robustness and more flexibility will be developed.

The design of the drivers, pixel circuits and TFT backplane matrix will be reconsidered as increasing display area influences the number of pixels-per-inch or the refresh rates.

Finally the program scope includes developing new manufacturing equipment such as fine patterning equipment for backplanes and tools for integrated roll-to-roll manufacturing.