Image quality enhancement in variable-refresh-rate AMOLED displays using a variable initial voltage compensation scheme

Abstract

In active matrix organic light emitting diode (AMOLED) displays, when a variable refresh rate is applied and the frame rate changes, the image’s color and luminance quality in AMOLED displays deteriorates. The frequency-dependent cognitive differences were experimentally demonstrated by using 6.76″ AMOLED displays. This phenomenon is dependent on the emission time and the data programming time on the frame rate. This degradation of the image quality during the frequency switch could be prevented by applying a variable initial voltage (VINI) to the OLED anode. For a frequency change between 60 and 120 Hz, the measured just noticeable color difference (JNCD) decreased from 7.50 to less than 1.00 in luminance, and from 2.34 to 0.02 in color. As our approach can prevent image quality distortion by utilizing an existing compensation pixel structure without additional compensation steps, it will be a promising technique for improving the picture quality in AMOLED displays.

Microsecond-response perovskite light-emitting diodes for active-matrix displays

“…More importantly, the continuous EL rise within tens of milliseconds would severely effect the brightness of high-refresh-rate AM displays, and the variable EL intensity would create difficulty in controlling the brightness 44,45 . As shown in Fig.…”

P‐6.14: Improvement of Image Sticking Performance in AMOLED Display by Extending Scan Pulse Width via a Novel Driving Circuit

“…Previous reports suggested a variety of methods to promote image sticking performance [1][2][3][4][5][6][7]. On the one hand, backplane fabrication process has significant effect on the formation of bulk and interfacial defects of thin films, thus dominates hysteresis and bias stress stability of thin-film transistor (TFT) device characteristics.…”

7‐3: Analysis of a 1.2‐in. 4k2k LCOS Display Phase Modulator for Holographic Display Applications

“…The development process of phase-only LCOS compensation technology will be also similar to the OLED displays at that time. In many emissive-type issues were gradually mature to solve in these years, such as mura noise, variable refresh rate (VRR) flicker, IR drop, crosstalk, short-term image sticking, and burn-in [17][18][19]. The research will reveal different phase modulation curves imported into CGH's algorithm to discuss the holographic image quality under reasonable FOV angle.…”