Abstract
This paper demonstrates an in-pixel mobility compensation scheme
for AMOLED pixel circuits, which requires only one capacitor and one
TFT additionally. The proposed scheme converts the mobility variation
into the voltage that is subtracted from the gate voltage of a driving
TFT to reduce the current error. The proposed structure is applicable
to both n-type and p-type TFT pixel circuits and is robust to the
process variation of capacitors because the ratio of two capacitors
is utilized. SPICE simulations show that, on average, the current
error reduction of 50.1%, 34.9%, and 63.3% is achieved for n-type
LTPS TFT, p-type LTPS TFT, and n-type oxide TFT pixel circuits, respectively,
compared with a normal pixel circuit without mobility compensation.
© 2014 IEEE
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