Advanced amorphous silicon thin film transistor active-matrix organic light-emitting displays design for medical imaging

Joo-Han Kim; Jerzy Kanicki

doi:10.1117/12.428069

28 May 2001 Advanced amorphous silicon thin film transistor active-matrix organic light-emitting displays design for medical imaging

Joo-Han Kim, Jerzy Kanicki

Author Affiliations +

Proceedings Volume 4319, Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures; (2001) https://doi.org/10.1117/12.428069
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

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.

Citation Download Citation

Joo-Han Kim and Jerzy Kanicki "Advanced amorphous silicon thin film transistor active-matrix organic light-emitting displays design for medical imaging", Proc. SPIE 4319, Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures, (28 May 2001); https://doi.org/10.1117/12.428069

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