Abstract
ABSTRACTThis paper proposes a novel 5T1C pixel circuit to compensate for the threshold voltage variation of n-channel LTPS TFTs for high-ppi AMOLEDs. SmartSpice simulation is used to evaluate the compensation capability of the proposed pixel circuit, and layout is performed to check the pixel density in 1 inch. The simulation results show that the proposed pixel circuit can compensate for the threshold voltage variation of n-channel poly-Si TFTs, and the layout confirms that the proposed pixel circuit can be integrated into upto564-ppi AMOLED displays.
Highlights
The active-matrix organic light-emitting diode (AMO LED) display has been the most popular display of late for smartphone applications due to its high flexibility, fast response time, wide viewing angle, low power consumption, and low thickness
A typical active-matrix OLEDs (AMOLEDs) pixel circuit consists of a driving transistor, several switching transistors, and one or two capacitors using low-temperature polysilicon (LTPS) thin-film transistors (TFTs), which have higher mobility than amorphous silicon (a-Si) TFTs
The luminance nonuniformity of the AMOLED display, is induced by the non-uniformity in the electrical characteristics of the driving TFTs because the luminance of the pixels is sensitive to the electrical characteristics of driving TFTs with the conventional pixel structure consisting of two transistors and one capacitor [3,4]
Summary
The active-matrix organic light-emitting diode (AMO LED) display has been the most popular display of late for smartphone applications due to its high flexibility, fast response time, wide viewing angle, low power consumption, and low thickness. A typical AMOLED pixel circuit consists of a driving transistor, several switching transistors, and one or two capacitors using low-temperature polysilicon (LTPS) thin-film transistors (TFTs), which have higher mobility than amorphous silicon (a-Si) TFTs. The luminance nonuniformity of the AMOLED display, is induced by the non-uniformity in the electrical characteristics of the driving TFTs because the luminance of the pixels is sensitive to the electrical characteristics of driving TFTs with the conventional pixel structure consisting of two transistors and one capacitor [3,4]. The current programing scheme can compensate for the change in both the threshold voltage and mobility of a driving TFT. This paper proposes a new voltage programing AMOLED pixel circuit, which can compensate for the threshold voltage variation of n-channel poly-Si TFTs, for high-ppi AMOLED displays
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