Polymer MEMS and Polymer Light Source Based Monolithic Integrated Displays (2007-2010)
This project aims to enable the monolithic integration of polymer microelectromechanical systems (MEMS) with polymer Organic Light Emitting Diodes (OLED) in order to produce two-dimensional (2D) displays. Such an integrated system will not only be very cheap due to the fabrication simplicity and the choice of polymer material as the structural layer, but also show similar performance when compared with the existing flat panel displays. Conventional solutions incorporate modulation of 2D LED/OLED matrix with a driver electronic circuitry. For such a display, the resolution depends on the number of LEDs in the 2D matrix, which becomes excessively large in terms of device number and expensive for high-resolution systems. Conventional realization techniques for 2D dot-matrix displays not only suffer from the large number of LEDs used in the system, but also (1) the low yield due to difficulties in high-density semiconductor LED fabrication, (2) reliability problems (dead pixels, LED-to-LED variations in luminance-current curves etc.) and (3) high power consumption of 2D LED matrix.
A Novel Integrated Optoelectronic System For Automatic Catheter Localization in Interventional MRI (2008-2011)
In this project, we propose an integrated MR compatible optoelectronic microsystem that supplies real time localization signal to the external world. The technique that will be used for localization and the implementation strategy is unique and novel. We are not aware of any former publications similar to our proposition where the microsystem is planned to include a photodiode die, a LED die, an inductor-capacitor (LC) tank and an integrated circuit (application specific integrated circuit-ASIC) all integrated on a miniature platform to fit on a catheter. In the proposed system, externally supplied laser power will be transmitted as optical power through a fiber-optic line to a photodiode. The photodiode will convert the optical power to the electrical current to charge a storage capacitor. The charged capacitor will act as a power source for the ASIC system. The basic function of the integrated circuit is to process the RF signal collected by the loop antenna to extract the position information. The output of the ASIC will be digitized and be used to drive the LED device. Thus, electro-optical conversion will be implemented. Once again using the fiber optic communication, LED signal will be transmitted to the external world, carrying the signature of the catheter localization information.