High-resolution active-matrix 10-um pixel-pitch GaN LED microdisplays for augmented reality applications

Templier, F.; Dupré, Ludovic; Dupont, Bertrand; Daami, Anis; Aventurier, Bernard; Henry, Franck; Sarrasin, Denis; Renet, S.; Berger, F.; Ochsenbein, F.; Mathieu, L.

doi:10.1117/12.2294527

Cited by 12 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microtube technology: background and potential for microLED displays Microtube technology has been developed for image sensors application [7], and more recently we have shown that it is a very efficient hybridization solution for the fabrication of highresolution, small pixel-pitch LED microdisplays [8]. The principle is to insert microtube made with rather hard material into a relatively soft pad (Figure 2).…”

Section: Solution For Efficient Microled Connectionmentioning

confidence: 99%

Mini-LED and Micro-LED: Promising Candidates for the Next Generation Display Technology

et al. 2018

View full text Add to dashboard Cite

We discuss the main challenges for the fabrication of emerging microLED displays. We shown that microtube technology is very well adapted to these new kind of displays, since it provides both mechanical and electrical connection of the microLEDs on the receiving substrate. Also, we present a new fabrication approach, where an elementary unit consists of all-in-one-RBG MicroLEDs on CMOS driving circuit.

show abstract

Section: Solution For Efficient Microled Connectionmentioning

confidence: 99%

Mini-LED and Micro-LED: Promising Candidates for the Next Generation Display Technology

et al. 2018

View full text Add to dashboard Cite

show abstract

“…To further shrink the pixel pitch down to below 10 µm for higher resolution, CEA-Leti has developed a micro-tube technology to perform the integration process [52,53]. The key step to the interconnection is the insertion of gold capped micro-tubes on the pads of Si circuit into the soft indium pads on the micro-LED array, with the micro-tubes created by using conformal metal deposition and "gap fill" type processes.…”

Section: Monolithic Fabrication Of Micro-displaysmentioning

confidence: 99%

Micro-LEDs, a Manufacturability Perspective

et al. 2019

View full text Add to dashboard Cite

Compared with conventional display technologies, liquid crystal display (LCD), and organic light emitting diode (OLED), micro-LED displays possess potential advantages such as high contrast, fast response, and relatively wide color gamut, low power consumption, and long lifetime. Therefore, micro-LED displays are deemed as a promising technology that could replace LCD and OLED at least in some applications. While the prospects are bright, there are still some technological challenges that have not yet been fully resolved in order to realize the high volume commercialization, which include efficient and reliable assembly of individual LED dies into addressable arrays, full-color schemes, defect and yield management, repair technology and cost control. In this article, we review the recent technological developments of micro-LEDs from various aspects.

show abstract

“…At CEA‐Leti 13 , very high luminance values of 1(10) Mcd/m 2 have indeed been demonstrated on blue (green) passive displays. More recently, 6 functional monochrome LED microdisplays have demonstrated up to 10 000 cd/m 2 in green. On this technological basis and experience, the purpose of the next section will be to specify the materials and technologies required for 1 Mcd/cm 2 and to assess the feasibility of such full color microdisplay.…”

Section: Microdisplay Application Requirementsmentioning

confidence: 99%

“…With this respect, inorganic micro‐LED displays are viewed as one of the most promising emerging solutions and has gained considerable attraction in recent years 3, 4 . Although the manufacturing of monochrome LED microdisplays have been demonstrated on several occasions by research and industry key players, 5–7 there is still a lack of high luminance full color microdisplay prototypes demonstrating red, green, and blue (RGB) pixels integrated on the same display. In the present avionics HMD development, because of the necessary compactness of our projection system, it is precisely this last approach that needs to be explored.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

High-resolution active-matrix 10-um pixel-pitch GaN LED microdisplays for augmented reality applications

Cited by 12 publications

References 3 publications

Mini-LED and Micro-LED: Promising Candidates for the Next Generation Display Technology

Mini-LED and Micro-LED: Promising Candidates for the Next Generation Display Technology

Micro-LEDs, a Manufacturability Perspective

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

Contact Info

Product

Resources

About