Flexible micro-LED display and its application in Gbps multi-channel visible light communication

Abstract

A flexible full-color micro-LED display with high mechanical robustness was fabricated by printing quantum dots (QDs) on a blue micro-LED array using standard photolithography. The red and green colors yielded from QDs exhibit a better color gamut than conventional color filters. The light conversion efficiency was enhanced by adding TiO2 nanoparticles to the QD-photoresist composite. This full-color micro-LED display was successfully mounted on various unusual substrates such as curved glass, fabrics, and human skin, enabling diverse optoelectronic applications. In addition, wireless multi-channel visible light communication (VLC) based on the wavelength-division-multiplexing orthogonal-frequency-division-multiplexing (WDM-OFDM) technique was demonstrated using a QD-based color micro-LED panel. A high data transmission rate of 1.9 Gbps was successfully obtained owing to the high electrical–optical modulation bandwidth of the QD-based micro-LED panel.

Shape-deformable Micro-LEDs for advanced displays and healthcare

“…The display features a high contrast ratio of > 1,000,000:1, a brightness of up to 700 nits, good display uniformity, and minimized color shift at any off-axis viewing angles, revealing its potential for high-resolution flexible automotive applications. Royole Co. demonstrated [12] ; (B) Stretchable display based on island-bridge structures [64] ; (C) Distortion-free stretchable display based on 2D Kirigami structures defined by laser cutting [10] ; (D) 3D foldable display based on an origami structure design [19] ; (E) Wearable contact lenses for the treatment of diabetic retinopathy [29] ; (F) Wirelessly powered, dual-color implantable probes for optogenetics [28] . Figure 2A adapted with permission from ref.…”

“…In contrast to the tremendous progress of using planar Micro-LEDs for conventional rigid displays, the development of flexible Micro-LED counterparts is currently actively explored, evidenced by intensive research interest from both academia and industry [9][10][11][12][13][14][15][16][17][18] . Benefiting from their extraordinary luminescent property, deformable displays made from inorganic Micro-LEDs can not only significantly improve visual experience of users but also potentially provide more convenience, better portability, and easier connectivity with their surroundings.…”

“…Furthermore, they allow more versatile design with various forms that are difficult to achieve using conventional planar devices. Examples of such innovations have led to the recent demonstration of distortion-free displays [10] , foldable three-dimensional (3D) displays [19] , etc.…”

2D Materials in Flexible Electronics: Recent Advances and Future Prospectives

“…However, the performance of the solution-based devices is slightly inferior (low responsivity, low switching speed, high operating voltage, and nontransparent nature) to that of the devices fabricated with CVD-based synthesis approaches due to the obvious granular nature of the films. MOCVD is the most promising approach for the synthesis of high-quality TMDs films over large-area and is therefore enormously explored to develop flexible optoelectronic devices with high-density circuit units toward industrial applications such as complex imaging, ,, neural computation and artificial synapses, ,, nonvolatile photoelectronic memory, emitter, and light emitter devices. ,, Hu et al fabricated an artificial synaptic device array in the form of a hemispherical electronic retina with CVD-grown MoS 2 film coated with a thin layer of In . The fabricated device demonstrated an impressive image-sensing function with learning capabilities and ultralow power consumption (Figure d).…”

Opportunities for cost-effective manufacturing of fully printed high performance displays enabled by vertical light-emitting transistor pixels

“…While LCD and AMOLED fight for market dominance, novel approaches are also being actively developed for the next generation flat-panel displays, with much work focused on the promising technology of micro-LEDs [21,22]. As an emissive display, micro-LEDs could readily match the high performance specifications set by the AMOLED displays, while providing a much higher peak brightness; moreover, the long lifetime of micro-LED displays will challenge the biggest drawbacks of AMOLED displays: their gradual but inevitable degradation over time [23][24][25]. Will micro-LED displays ultimately supersede AMOLED, as LCD once did to CRT?…”