Abstract
This work presents a new active-matrix organic light-emitting diode (AMOLED)
pixel circuit with a novel driving scheme that is based on low-temperature
polycrystalline-silicon thin film transistors (LTPS TFTs). The proposed circuit that
consists of one driving TFT and two switching TFTs, which are all p-type, can
successfully compensate for not only variations in the TFT threshold voltage but also
the current-resistance (IR) voltage drop in the power line. The functionality of the
pixel circuit for the array structure and the uniformity of organic light-emitting diode
(OLED) current are verified using H-Simulation Program with Integrated Circuit Emphasis
(HSPICE). According to the results of a simulation, over the entire range of tested data
voltages (-4.5 to -2.5 V), the relative errors of the OLED
current of the proposed circuit are below 1.2% when the driving TFT threshold voltage
varies from -0.5 to +0.5 V.
© 2012 IEEE
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