Abstract
Active-matrix organic light-emitting-diode (AMOLED) displays based on
amorphous hydrogenated silicon (a-Si:H) thin-film transistors (TFTs) are the
state of the art in display technology, owing to the feasilibility of low-cost
fabrication and accessability to well-established TFT-LCD fabrication. While
the a-Si:H TFT offers excellent matching of device properties over large areas,
it suffers from a gate-bias-dependent threshold voltage shift in time, leading
to grayscale inaccuracies. In order to counter this problem, many compensation
circuits have been designed. The purpose of the compensation circuit is to
estimate the threshold voltage shift in driver TFTs and apply a correction
so as to maintain a constant brightness. However, all of the compensation
circuits designed to date suffer from low spatial and temporal resolution
and reliability issues or high cost due to the use of custom-made CMOS technology.
In this paper, we focus on building AMOLED display systems solely based on
a-Si:H TFT technology along with the use of off-the-shelf CMOS components
to lower costs. Furthermore, we achieve high spatial and temporal resolution
and high yield with the use of a two-TFT voltage programmed pixel circuit
along with a statistical based external calibration circuit.
© 2007 IEEE
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