Printed Assemblies of Ultrathin, Micro-scale Inorganic Light Emitting Diodes for Deformable and Semitransparent Displays
Display devices represent ubiquitous, central components of nearly all consumer electronics technologies. Organic light emitting diodes (OLEDs) are rapidly emerging as an attractive alternative to backlit liquid crystals due to their comparatively high refresh rates, contrast ratios, power efficiencies and capacity for vibrant color rendering. Inorganic light emitting diodes (iLEDs) can also form displays, with properties such as brightness, lifetime and efficiency that can exceed those possible with OLEDs. Presently, however, these displays exist only in ultra-large area, low resolution formats (square meters; billboard displays), limited by processing and assembly procedures that do not scale effectively to small (< ~200x200 µm), thin (< ~200 µm) light emitters or to dense, high pixel count arrays.
This technology presents routes to create ultrathin (~2.5 µm; thinner possible), ultra-small (down to ~25x25 µm; smaller possible) iLEDs, in flat or ‘wavy’ geometries and to assemble them into large scale, addressable arrays using scalable processing techniques, on substrates ranging from glass to plastic and rubber.