Low temperature a-Si : H pixel circuits for mechanically flexible AMOLED displays

TitleLow temperature a-Si : H pixel circuits for mechanically flexible AMOLED displays
Publication TypeConference Paper
Year of Publication2003
AuthorsNathan, A., D. Striakhilev, P. Servati, K. Sakariya, A. Kumar, K. S. Karim, and A. Sazonov
EditorFruehauf, N., B. R. Chalamala, B. E. Gnade, and J. Jang
PublisherMat Res Soc
Conference Location506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA
ISBN Number1-55899-706-7

This paper presents the first demonstration of amorphous silicon (a-Si:H) thin film transistor (TFT) circuit integration on plastic substrates. The circuits compensate for material shortcomings such as metastable threshold voltage (V-T) shift and high contact resistance, to supply stable and predictable currents to drive organic light emitting diode (OLED) displays on plastic. Various drive circuits were fabricated and tested. The simplest pixel driver circuit possible is the two TFT voltage-programmed circuit, which is very susceptible to any shift in V-T of the drive TFT. To overcome this problem, we have developed current-programmed pixel circuits based on the current mirror circuit family, which include the simple and cascode current mirrors. The OLED current in these circuits is virtually independent of any V-T shift or mobility variation in the drive TFT. Results show that the circuits provide higher linearity and dynamic range than currently available pixel circuits while minimizing the pixel area.

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