Abstract
This paper presents a driving scheme to achieve highly stable low-power
amorphous silicon (a-Si:H) active-matrix organic light-emitting diode (AMOLED)
displays. Although the conventional 2-thin-film transistor (TFT) a-Si:H AMOLED
display has demonstrated interesting features, including simplicity, it is
prone to growing nonuniformity due to the temporal instability of the a-Si:H
material. Several compensating techniques have been proposed to control the
nonuniformity, but they tend to compromise the key attributes of the simple
2-TFT display such as low power consumption, high yield, high aperture ratio,
low implementation cost, and fast programming. For mobile applications which
have tight constrains on power consumption, cost, and escalating resolution
requirements, we propose a new driving and addressing scheme that not only
improves the backplane stability, but also compensates for the OLED luminance
degradation while maintaining the attractive features of the simple 2-TFT
pixel circuit. The overhead in power consumption and implementation cost is
reduced by over 90% compared to existing compensation driving schemes.
© 2008 IEEE
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