A novel LTPO AMOLED pixel circuit and driving scheme for variable refresh rate

This paper proposes a novel pixel circuit and driving scheme that adopts low-temperature polycrystalline silicon oxide thin-film transistors (LTPO TFTs) for mobile devices using active-matrix organic light-emitting diode (AMOLED) displays. The proposed provide uniform luminance render flicker invisible at variable refresh rates (VRRs) from 1 to 120 Hz. Using the with extended compensation time (tCOMP) improves uniformity high-frame rate. applies voltage TFTs (D-TFTs) higher than programmed data during skip frame. reduces caused by hysteresis of D-TFTs low-frame rate driving. A 6.0-inch quad high-definition (QHD) LTPO-based AMOLED display was fabricated new scheme. Experimental results show standard deviation reduced 0.056 0.008 extending tCOMP 2 8 µs. level −51 dB, so there no visual artifact Hz flicker-free low power consumption is possible; can proceed in 1–120 range.