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Current-source a-Si:H thin-film transistor circuit for active-matrix organic light-emitting displays

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3 Author(s)
He, Y. ; Appl. Phys. Program, Michigan Univ., Ann Arbor, MI, USA ; Hattori, R. ; Kanicki, J.

We describe a four thin-film-transistor (TFT) circuit based on hydrogenated amorphous silicon (a-Si:H) technology. This circuit can provide a constant output current level and can be automatically adjusted for TFT threshold voltage variations. The experimental results indicated that, for TFT threshold voltage shift as large as /spl sim/3 V, the output current variations can be less than 1 and 5% for high (/spl ges/0.5 μA) and low (/spl les/0.1 μA) current levels, respectively. This circuit can potentially be used for the active-matrix organic light-emitting displays (AM-OLEDs).

Published in:

Electron Device Letters, IEEE  (Volume:21 ,  Issue: 12 )