53.5: High‐Speed AMOLED Pixel Circuit and Driving Scheme

Abstract

An active matrix organic light emitting diode pixel circuit and its driving scheme for high frame frequency are proposed for implementation of a 3D display. The proposed pixel circuit can compensate the threshold voltage distribution of low temperature poly silicon-thin film transistors at high-speed operation of 240Hz or more. According to the simulation, current deviation of 1.73% and 3.94% are obtained at frame rates of 240Hz and 480Hz when V th distribution is ±0.5 V.

A course on thin‐film transistor circuit design for modern displays

“…Because there is still lack of super stable and spatially uniform TFTs to meet the requirements, much more complicated pixel circuits are required to compensate the spatial or temporal luminance variations caused by processes or long‐time device operations for practical applications, as shown in Fig. (c) . AMOLED display backplane thus require deeper considerations in TFT circuit design.…”

“…1(c). [5][6][7][8] AMOLED display backplane thus require deeper considerations in TFT circuit design.…”

A New Voltage Driving Scheme to Suppress Non-Idealities of Polycrystalline Thin-Film Transistors for AMOLED Displays

“…1(a), it suffers several non-idealities of the electrical characteristics of normal poly-Si TFTs, including spatial variations and kink effects. Therefore, additional compensation functions are required to be integrated in the pixel circuits [2]- [6], with an example of a 5T-2C design as shown in Fig. 1(b), which is able to compensate the threshold voltage variation and IR drop on the power supply line [6].…”

“…Therefore, additional compensation functions are required to be integrated in the pixel circuits [2]- [6], with an example of a 5T-2C design as shown in Fig. 1(b), which is able to compensate the threshold voltage variation and IR drop on the power supply line [6]. However, the increase of the circuit components is limited by the allowable pixel layout area and the concern of the production yield.…”

P.32: A New a‐IGZO AMOLED Pixel Circuit Design to Improve the OLED Luminance Degradation in 3D Displays

“…However, as the frame rate increases, the time to scan a pixel line decreases, which may reduce the threshold voltage (Vth) compensation time and even lead to the failure of compensation mechanism. Thus, the developed progressive emission (PE) driving scheme can effectively increase the Vth compensation time of the driving TFTs [3]. However, the PE driving scheme needs to insert an additional vertical blank time to prevent leftright (L-R) crosstalk occurring, limiting the emission time.…”