Share Email Print

Proceedings Paper

Advanced amorphous silicon thin film transistor active-matrix organic light-emitting displays design for medical imaging
Author(s): Joo-Han Kim; Jerzy Kanicki
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Constant-current, active-matrix organic light-emitting displays (AM-OLEDs) with the advanced hydrogenated amorphous silicon thin film transistor (a-Si:H TFT) pixel electrode circuits have been designed in our laboratory for medical applications. An extensive pixel electrode circuit simulation and analysis indicate that a continuous pixel electrode excitation can be achieved with these circuits, and a pixel electrode driving output current level up to 1.4 (mu) A can be reached with an a-Si:H TFT technology. Small feed-through voltage (few tenth of mV) that can be achieved with this circuit will enhance the display gray level controllability needed for medical imaging. Each pixel electrode has a threshold voltage compensation circuit to adjust the pixel electrode driving current level for threshold voltage shifts of both the organic light-emitting diodes (OLEDs) and the current driving a-Si:H TFT. For a 16-inch VGA full-color AM-OLED with a pixel electrode size of ~60x115 micrometers 2, the output current level is equivalent to a pixel current density of 20 mA/cm2. Assuming the OLEDs with an external quantum efficiency of 1%, the AM-OLED brightness of ~88, ~960, and ~160 cd/m2 for red (650 nm), green (540 nm), and blue (480 nm) light emission, respectively, can be achieved with this type of pixel electrode circuits.

Paper Details

Date Published: 28 May 2001
PDF: 13 pages
Proc. SPIE 4319, Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures, (28 May 2001); doi: 10.1117/12.428069
Show Author Affiliations
Joo-Han Kim, Univ. of Michigan (United States)
Jerzy Kanicki, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 4319:
Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures
Seong Ki Mun, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?