High-frame-rate (HFR) technologies are used to achieve superior image quality in high-performance applications such as gaming or watching movies. Furthermore, portable products with adjustable frame rates are displayed with cutting-edge technology. The recent trend of display panels in high-end portable devices requires not only high resolution and pixels per inch but also low power consumption.

As a result, the proposed 6T1C pixel circuit is a good candidate for use in portable AMOLED displays.īecause of the benefits of outstanding color characteristics, short response time, high contrast ratio, and low power dissipation, active-matrix organic light-emitting diodes (AMOLEDs) have been widely used in display technologies. The results of the simulation reveal that threshold voltage variations in driving thin-film transistors of ☐.33 V can be well sensed and compensated with a 1.8% average shift of OLED currents in high-frame-rate operation (120 Hz), while the maximum variation in OLED currents within all gray levels is only 3.56 nA in low-frame-rate operation (1 Hz). The calculation and analysis of programming time are discussed, and the optimal storage capacitor for the proposed circuit’s high-speed driving is selected.

It also provides low-voltage driving and immunity to OLED degeneration issues. The proposed circuit has a simple structure and is based on the design of sharing lines of switch-controlling signals. This paper proposes a new 6T1C pixel circuit based on low-temperature polycrystalline oxide (LTPO) technology for portable active-matrix organic light-emitting diode (AMOLED) displays with variable refresh rates ranging from 1 to 120 Hz.

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