Director of Engineering, Ignis Innovation
USE of External compensation to Increase Resolution and Stability of Flexible OLED Displays
(1) Director Engineering, Ignis Innovation, 50 Bathurst Drive Unit 12, Waterloo, Ontario Canada
It is a well-known fact that Vth shift must be compensated for in OLED display to get uniform output on the displays. The industry standard by the leading display manufacturers utilize 6 or 7 transistor circuits to complete in pixel compensation for Vth shift. An alternative to using many transistors is to build a feedback mechanism in the panel to measure the Vth shift and add active dynamic compensation to the panel. A key component of this solution is the addition of the measurement circuit to the source driver minimizing the overall impact on the final product design. This methodology adds the benefit of also being able to measure the OLED shift and develop compensation algorithms for both OLED and TFT degradation over time. In addition having the ability to measure the pixel allows for the use of different low temperature processed backplanes and TFT’s such as metal oxide, the standard for larger area OLED displays. This paper outlines the results of this configuration on a 4 transistor flexible panel and can be transitioned to other panel with even less transistors and technology configurations.