A digitally driven pixel circuit with current compensation for AMOLED microdisplays

Yuan Ji; Feng Ran; Hongguang Xu; Weixin Shen; David J Lilja

doi:10.1002/jsid.259

A digitally driven pixel circuit with current compensation for AMOLED microdisplays

Yuan Ji, Feng Ran, Hongguang Xu, Weixin Shen, David J Lilja

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

A novel digitally driven pixel circuit for active-matrix organic light-emitting diode (OLED) microdisplays is proposed and evaluated. This circuit supports both pulse width modulation and pulse density modulation digital drive approaches. Only three transistors and one capacitor are required per pixel for the proposed circuit. A current mirror is used to compensate for the pixel current changes that occur because of the degradation of the OLEDs over time. The compensation current depends on the potential of the common cathode, the properties of the current mirror, and the Width/Length (W/L) ratio of the drive transistor. The proposed digital pixel circuit also has advantages in circuit layout compared with analog pixel circuits.

Original language	English (US)
Pages (from-to)	465-472
Number of pages	8
Journal	Journal of the Society for Information Display
Volume	22
Issue number	9
DOIs	https://doi.org/10.1002/jsid.259
State	Published - Sep 1 2014

Bibliographical note

Publisher Copyright:
© Copyright 2015 Society for Information Display.

Keywords

AMOLED (active-matrix organic light-emitting diode)
CMOS
OLED degradation compensation
digital drive
microdisplay
pixel circuit

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title = "A digitally driven pixel circuit with current compensation for AMOLED microdisplays",

abstract = "A novel digitally driven pixel circuit for active-matrix organic light-emitting diode (OLED) microdisplays is proposed and evaluated. This circuit supports both pulse width modulation and pulse density modulation digital drive approaches. Only three transistors and one capacitor are required per pixel for the proposed circuit. A current mirror is used to compensate for the pixel current changes that occur because of the degradation of the OLEDs over time. The compensation current depends on the potential of the common cathode, the properties of the current mirror, and the Width/Length (W/L) ratio of the drive transistor. The proposed digital pixel circuit also has advantages in circuit layout compared with analog pixel circuits.",

keywords = "AMOLED (active-matrix organic light-emitting diode), CMOS, OLED degradation compensation, digital drive, microdisplay, pixel circuit",

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AU - Ji, Yuan

AU - Ran, Feng

AU - Xu, Hongguang

AU - Shen, Weixin

AU - Lilja, David J

PY - 2014/9/1

Y1 - 2014/9/1

N2 - A novel digitally driven pixel circuit for active-matrix organic light-emitting diode (OLED) microdisplays is proposed and evaluated. This circuit supports both pulse width modulation and pulse density modulation digital drive approaches. Only three transistors and one capacitor are required per pixel for the proposed circuit. A current mirror is used to compensate for the pixel current changes that occur because of the degradation of the OLEDs over time. The compensation current depends on the potential of the common cathode, the properties of the current mirror, and the Width/Length (W/L) ratio of the drive transistor. The proposed digital pixel circuit also has advantages in circuit layout compared with analog pixel circuits.

AB - A novel digitally driven pixel circuit for active-matrix organic light-emitting diode (OLED) microdisplays is proposed and evaluated. This circuit supports both pulse width modulation and pulse density modulation digital drive approaches. Only three transistors and one capacitor are required per pixel for the proposed circuit. A current mirror is used to compensate for the pixel current changes that occur because of the degradation of the OLEDs over time. The compensation current depends on the potential of the common cathode, the properties of the current mirror, and the Width/Length (W/L) ratio of the drive transistor. The proposed digital pixel circuit also has advantages in circuit layout compared with analog pixel circuits.

KW - AMOLED (active-matrix organic light-emitting diode)

KW - CMOS

KW - OLED degradation compensation

KW - digital drive

KW - microdisplay

KW - pixel circuit

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A digitally driven pixel circuit with current compensation for AMOLED microdisplays

Abstract

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Keywords

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