FIRST ACTIVE-MATRIX WVGA GaN MICRODISPLAY
WITH 10 μm PIXEL PITCH
What Is
MOTION GaN?
Tomorrow's microdisplays will have to offer both high resolution and high brightness (100 times brighter than those of today) to meet the growing demand for augmented reality applications.
Self-emissive GaN-based technology can now offer such performances; Leti is developing high-resolution, 10 μm pitch GaN microdisplay technology by patterning high-density μLED arrays and hybridizing them on CMOS circuits using its micro-tube technology.
This demonstrator is a monochrome (blue or green) active-matrix prototype with 873 x 500 pixel WVGA resolution and a 10 μm pixel pitch.
Partnership with:
Applications:
GaN displays have a number of potential applications
including:
- Augmented reality glasses for consumers and professionals
- Head-up displays for transport
- Pico- and compact projectors
What’s
new?
This prototype provides the highest (873 x 500) pixel resolution with the smallest (10 μm) pixel pitch ever.
These performance characteristics result from:
- Advanced high-resolution, small pixel pitch μLED patterning [Ref. 1]
- Leti unique micro-tube hybridization technology, which is compatible with 5 - 10 μm pixel pitches [Ref. 2].Ce prototype offre la résolution en pixels la plus élevée (873 x 500) associée au pas de pixel le plus petit jamais obtenu (10 µm).
Ref. 1 : L. Dupré et al. "Processing and characterization of high resolution GaN/InGaN LED arrays at 10 micron pitch for micro display applications" Proc. of SPIE Vol. 10104 (2017)
Ref. 2 : F. Templier et al. "High-Brightness GaN LED Arrays Hybridized on Silicon Interconnect at a Pixel Pitch of 10 μm" (IDW/AD'14), 3-5 décembre, Niigata, Japon (2014)
What’s Next?
- Even smaller pixel pitches (< 5 μm)
- 3 μm pitch feasibility: process under development, new findings to be presented at SID Display Week 2017
- A key challenge: full-color GaN microdisplays, for which solutions are now being developed, leading to first prototypes in 2018-2019