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3. Dimensioning a full color LED microdisplay for augmented reality headset in a very bright environment

Author

Marianne Consonni, Michele D'Amico, Patrick Demars, Myriam Tournaire, Jean-Christophe Pillet, Jean Michel Lamy, Alexandre Lagrange, Margaux Vigier, Cao Edgar, Aurélien Suhm, Eric Feltin, Laurent Charrier, Badhise Ben Bakir, Philippe Coni, Valentin Le Marchand, Gunther Haas, Etienne Quesnel, Nicolas Olivier, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Novagan, Nexdot, MICROOLED, Thales Avionics (Thales Avionics), Europe, European Project: 755497,Hilico, and NEXDOT

Subjects
color conversion, Materials science, Headset, 02 engineering and technology, Full color, 7. Clean energy, 01 natural sciences, GaN, law.invention, [SPI]Engineering Sciences [physics], law, 0103 physical sciences, Computer vision, Electrical and Electronic Engineering, Dimensioning, 010302 applied physics, business.industry, 021001 nanoscience & nanotechnology, microdisplay, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Active matrix, High luminance, high luminance, Augmented reality, Artificial intelligence, active matrix, 0210 nano-technology, business
Abstract

International audience; This paper focuses on the dimensioning of a very bright full color 10 μm-pitch light-emitting device (LED) microdisplay for avionics application. Starting from the specifications of head-mounted display to be used in an augmented reality optical system, a theoretical approach is proposed that enables predicting the specifications of the main technology building blocks enteringinto the microdisplay manufacturing process flow. By taking into account various material and technological parameters, kept as realistic as possible, it is possible to assess the feasibility of a very bright LED microdisplay (1 Mcd/m2 full white) and to point out the main limitations. The theoretical specifications are then compared with the technical results obtained so far in the framework of the H2020 Clean Sky “HILICO” project. It shows that 350 000 cd/m2 of white emission may be accessible with the present gallium nitride (GaN)-micro-LED technology provided a color conversion solution with stable external quantum efficiency of 30% is available. Beyond such level of luminance, the inherent limitations of driving circuit (4 V, 15 μA per pixel) commandsworking with materials enabling higher external quantum efficiency (EQE). In particular, 10-μm-pitch micro-LEDs with electroluminescence EQE of 15% and color conversion EQE approaching 60% are needed, opening the way to future challenging material and technology research developments.

Published
2020

4. Dimensioning a full color LED microdisplay for augmented reality headset in a very bright environment

Author

Quesnel, Etienne, primary, Lagrange, Alexandre, additional, Vigier, Margaux, additional, Consonni, Marianne, additional, Tournaire, Myriam, additional, Le Marchand, Valentin, additional, Suhm, Aurélien, additional, Demars, Patrick, additional, Pillet, Jean‐Christophe, additional, Ben Bakir, Badhise, additional, Olivier, Nicolas, additional, Feltin, Eric, additional, Lamy, Jean Michel, additional, D'Amico, Michele, additional, Cao, Edgar, additional, Haas, Gunther, additional, Charrier, Laurent, additional, and Coni, Philippe, additional

Published
2020
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5. Dimensioning a full color LED microdisplay for augmented reality headset in a very bright environment.

Author

Quesnel, Etienne, Lagrange, Alexandre, Vigier, Margaux, Consonni, Marianne, Tournaire, Myriam, Le Marchand, Valentin, Suhm, Aurélien, Demars, Patrick, Pillet, Jean‐Christophe, Ben Bakir, Badhise, Olivier, Nicolas, Feltin, Eric, Lamy, Jean Michel, D'Amico, Michele, Cao, Edgar, Haas, Gunther, Charrier, Laurent, and Coni, Philippe

Subjects
AUGMENTED reality, AVIONICS, GALLIUM nitride, QUANTUM efficiency, HEAD-mounted displays, LED displays, HEADSETS, MANUFACTURING processes
Abstract

This paper focuses on the dimensioning of a very bright full color 10 μm‐pitch light‐emitting device (LED) microdisplay for avionics application. Starting from the specifications of head‐mounted display to be used in an augmented reality optical system, a theoretical approach is proposed that enables predicting the specifications of the main technology building blocks entering into the microdisplay manufacturing process flow. By taking into account various material and technological parameters, kept as realistic as possible, it is possible to assess the feasibility of a very bright LED microdisplay (1 Mcd/m2 full white) and to point out the main limitations. The theoretical specifications are then compared with the technical results obtained so far in the framework of the H2020 Clean Sky "HILICO" project. It shows that 350 000 cd/m2 of white emission may be accessible with the present gallium nitride (GaN)‐micro‐LED technology provided a color conversion solution with stable external quantum efficiency of 30% is available. Beyond such level of luminance, the inherent limitations of driving circuit (4 V, 15 μA per pixel) commands working with materials enabling higher external quantum efficiency (EQE). In particular, 10‐μm‐pitch micro‐LEDs with electroluminescence EQE of 15% and color conversion EQE approaching 60% are needed, opening the way to future challenging material and technology research developments. [ABSTRACT FROM AUTHOR]

Published
2021
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