Design of novel architectures of LED GaN based Micro-display driver circuits

Published : 13 December 2016

This thesis aims at exploring new architectures of analog circuits dedicated to active-matrix inorganic Light-Emitting Diode micro-display.

The emergence of virtual and augmented reality glasses market, as well as smart lighting, creates new needs for micro-display coupled with a lens integrated in the glass (like Google glasses). To address this future market, dedicated circuits have to manage several factors:

Matrix resolution increase (HD, 4K …) implies a pixel size reduction in order to maintain a reasonable size and an easy integration of micro-display.

Moreover, a high contrast of luminance allows ambient luminosity adaptation. It is obtained thanks to the use of GaN LED and strong polarization currents.

In order to satisfy the low power consumption, and battery life time requirements of handheld applications, power efficiency optimization (luminance emitted over the electrical power absorbed by the system) must be taken into account. In addition, problems of thermal heating, electromigration and voltage drop in the power rails must be addressed.

The candidate will have a microelectronic profile, and preferably specialized in analog integrated circuit design. A good knowledge of circuit design CAD tools will be important (Cadence, and also Matlab). He is expected to be autonomous in his work.

The thesis schedule is first to make a status of the state of the art (20% of the time), then to design a circuit capable of driving a LED array taking into account the new technological constraints (50%), and finally to test a functional prototype highlighting the scientific and industrial potentialities of this type of microdisplay (20%).

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