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MOTION GaN


 



Published on 24 April 2019


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:
III - V lab.jpg

  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)
 motion gan.PNG

 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

KEY FACTS:

Innovation Award at
TechConnect World 2015,
Washington DC

• Best paper award at
International Display
Week (IDW)’16, Fukuoka
Japan Dec.2016: “A new
Approach for Fabricating
High-Brightness GaN LED
Microdisplays with High
Resolution and Very Small
Pixel-pitch”

• Leti holds more than
10 patents in this technology

  •      FLYER

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5x8 mm WVGA Leti microdisplays

© Leti – Credits photos : CEA– 05/2017