Abstract
A novel pixel driving circuit for active-matrix organic light-emitting diode (AMOLED) displays with low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) is studied. The proposed compensation pixel circuit is driven by voltage programming scheme, which is composed of five TFTs and one capacitor, and has been certified to provide uniform output current by the Automatic Integrated Circuit Modeling Simulation Program with Integrated Circuit Emphasis (AIM-SPICE) simulator. The results of simulation show excellent performance, such as the low average error rate of OLED current variation (<0.5%) and the low average nonuniformity of OLED current variation (<0.8%) while the shift of threshold voltage of the driving poly-Si TFT and the OLED are both in the worst case ( V for TFT and V for OLED). The proposed pixel circuit shows high immunity to the threshold voltage deviation of both the driving poly-Si TFT and the OLED.
Highlights
The organic light-emitting diode (OLED) has gained a lot of attention due to its potential advantages, such as light weight, fast response time, wide viewing angle, and high brightness [1,2,3]
We propose a new voltage programming active-matrix organic light-emitting diode (AMOLED) pixel design
At the end of compensating period, the gate voltage of driving TFT (DTFT) is discharged until 2 V (VTH + voltages of both the DTFT (VTH) O), where VTH is the threshold voltage of DTFT, and VTH O is the threshold voltage of OLED
Summary
The organic light-emitting diode (OLED) has gained a lot of attention due to its potential advantages, such as light weight, fast response time, wide viewing angle, and high brightness [1,2,3]. The PM driving method has some merits of simple manufacturing process, high yield, and larger aperture ratio It has a challenge of the large size and highresolution panels because of its high power consumption and short OLED life time [4]. Though the current programming method can compensate for the variation of both mobility and threshold voltage, but it has demerits in that low data current will result in long settling time because of the high parasitic capacitance of data lines. Comparing with current programming method, the voltage programming method is more suitable to be applied in large size and high-resolution panels due to the ability of short settling time. The proposed design successfully provides highly stable OLED current and is suitable for large-size and high-resolution displays. (i) (ii) (iii) (iv) Figure 2: Proposed pixel design and timing scheme of the signal line
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