Abstract
Hydrogenated amorphous silicon (a-Si:H) active matrix organic light-emitting
diode (AMOLED) displays are attractive given the potentially low manufacturing
cost and ultimately low-temperature fabrication enabling using flexible substrates.
Although the conventional two thin-film transistor (2-TFT) AMOLED voltage-programmed
pixel circuit (VPPC) can provide high resolution and high yield, the 2-TFT
VPPC is prone to image retention over time due to shift in the threshold voltage
(V<sub>T</sub>-shift) of a-Si:H
TFTs. This paper presents a new driving scheme that not only preserves the
simplicity of the 2-TFT VPPC, but also demonstrates high uniformity. Experimental
results indicate that the current drop in the new driving scheme is less than
11% after 15 days of operation whereas it is over 50% for the conventional
driving scheme. Moreover, the new driving scheme is less sensitive to temperature
variations due to an internal feedback mechanism. After a 70% change in the
temperature, the current in the conventional driving scheme increases by as
much as 300%. However, the current in the driving scheme presented here is
approximately constant.
© 2006 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription