Work

A 4T1C Pixel Circuit with Threshold Voltage Compensation for Organic Light-Emitting Diode on Silicon Microdisplays

Year: 2025

Type: article

Abstract: In this paper, a pixel circuit consists of four MOSFETs and one capacitor is proposed for Organic Light-Emitting Diode on Silicon (OLEDoS) microdisplays. The proposed pixel circuit enhances luminance uniformity by compensating for the threshold voltage variation of the driving transistors by the capacitive coupling effect. Even with a threshold voltage variation of ±20 mV, the HSPICE simulation results reveal that the driving current offset stays between −0.89 and 0.70 LSB, which is more than seven times smaller than that of the conventional 2T1C pixel circuit. Additionally, a two-stage DAC driving scheme has been utilized to achieve 256 gray levels, aiming to reduce the accuracy requirements for the DAC circuit. The proposed pixel circuit demonstrates significant potential in high-performance OLEDoS microdisplay applications.

Source: Electronics

DOI: 10.3390/electronics14050824

Authors: Jian Sun, Chen Li, Yuexin Cao, Liangde Lai, Weichen Song

Institution: Southeast University

Language: English

Topic: Analog and Mixed-Signal Circuit Design

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funders: Natural Science Foundation of Jiangsu Province, National Key Research and Development Program of China