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A LED micro-display with 90×90 pixels on a 80 μm pitch

Lookup NU author(s): Professor Patrick Degenaar


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© 2015 IMAPS Europe. We report on the flip-chip packaging of 90×90 arrays of addressable microLEDs onto CMOS circuitry by a solder reflow process. The substrate emitting microLEDs were parabolically shaped and fabricated on free-standing GaN. The individual emitters were 15 μm in diameter with an array pitch of 80 μm where all bond pads were given a gold finish. The solder balls were dispensed onto the CMOS pads with an automated PacTech solder dispenser that dispensed 50 μm diameter solder spheres with a composition of Sn (96.5%)-Ag-(3%)-Cu (0.5%). After alignment of the LED array on top of the CMOS chip, the solder was reflowed at a temperature of 260 C in nitrogen ambient. The completed assemblies form micro-displays that can display computer generated patterns designed for the stimulation of neural cells. The displays were designed to be mounted on the camera port of a microscope to project the emitted light onto neural tissue.

Publication metadata

Author(s): Akhter M, Lee JS, Maaskant PP, Rensing M, Nudds N, O'Brien P, Degenaar P, Corbett B

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 20th European Microelectronics and Packaging Conference and Exhibition: Enabling Technologies for a Better Life and Future, EMPC 2015

Year of Conference: 2015

Online publication date: 28/01/2016

Acceptance date: 01/01/1900

Publisher: Institute of Electrical and Electronics Engineers Inc.


Library holdings: Search Newcastle University Library for this item

ISBN: 9780956808622