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Related Experiment Video

Updated: Sep 27, 2025

Development of Efficient OLEDs from Solution Deposition

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

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

Li Jin Kim^1,2, Sujin Jung¹, Hee Jun Kim¹

¹School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.

Scientific Reports

|April 9, 2022

Summary

Image quality in active matrix organic light emitting diode (AMOLED) displays degrades with variable refresh rates. Applying a variable initial voltage (V_INI) to the OLED anode significantly improves color and luminance, preventing distortion.

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Area of Science:

Display Technology
Materials Science
Human-Computer Interaction

Background:

Active matrix organic light emitting diode (AMOLED) displays exhibit image quality degradation when variable refresh rates are employed.
This phenomenon is linked to frequency-dependent cognitive differences, emission time, and data programming time.
Existing AMOLED displays face challenges in maintaining consistent visual quality during frame rate transitions.

Purpose of the Study:

To investigate the causes of image quality deterioration in AMOLED displays during variable refresh rate operation.
To demonstrate a novel method for preventing visual distortion caused by frame rate changes.
To enhance the color and luminance fidelity of AMOLED displays under dynamic refresh rate conditions.

Main Methods:

Experimental demonstration using 6.76-inch AMOLED displays to quantify frequency-dependent cognitive differences.
Implementation of a variable initial voltage (V_INI) applied to the OLED anode.
Measurement of just noticeable color difference (JNCD) for luminance and color before and after applying the V_INI method.

Main Results:

A significant decrease in JNCD was observed for luminance, from 7.50 to under 1.00, and for color, from 2.34 to 0.02, when switching between 60 Hz and 120 Hz.
The application of variable V_INI effectively mitigated the image quality degradation associated with refresh rate changes.
The proposed method leverages existing compensation pixel structures, requiring no additional compensation steps.

Conclusions:

Variable initial voltage (V_INI) is a viable solution to prevent image quality distortion in AMOLED displays during refresh rate transitions.
This technique offers a promising approach to improving overall picture quality in AMOLED technology.
The method's compatibility with existing hardware makes it a practical advancement for display manufacturers.