Nitride micro‐display with integrated micro‐lenses

Abstract

We report progress in control of the emission from both parallel-addressed and matrix-addressed micro-array light-emitting diodes (micro-LEDs), using integrated micro-lenses. The integrated matrix-addressed device consists of a 128 × 96 element array with 470 nm emission, aligned to a 128 × 96 element sapphire micro-lens array. The lenses have a diameter of 12 µm, a centre height of 1.8 µm and a measured focal length of 8 µm. The root-mean-square (r.m.s.) roughness of the lenses, as measured by atomic force microscopy (AFM), is better than 3 nm, ensuring high optical quality. The integrated array enables the light emitted from the individual elements to be well-resolved

Fabrication of large-size photonic crystals by holographic lithography using a lens array

“…The homogeneity of the illumination can also be improved with a lens array [19]. Similar scheme was used in wireless communications [20] and in display optics [21,22]. We show in this paper that, with a mask, a lens array and an additional large numerical aperture lens, larger-sized PCs can be conveniently fabricated.…”

Integrated parabolic nanolenses on MicroLED color pixels

“…In a nanopillar micro-LED, each nanopillar acts as a point light source and hence its emission can be collimated by a nanoscale parabolic lens [17]. This approach deviates from other microlens work [18,19] in that the overall profile of the lens array is nearly flat compared to the dimension of the microLED. As a result, the proposed nanoscale parabolic lenses do not pose an additional constraint on the spatial resolution of the display.…”

37.2: Fiber‐Coupled Emissive Micro‐Light‐Emitting Diode Arrays

“…The divergent nature of LED emission results in inevitable crosstalk between adjacent pixels. In our previous works on micro-LED arrays, it was found that the light cone from adjacent pixels tend to merge at higher driving currents due to Lambertian dispersion [9], making it impossible to resolve individual pixel points. The fiber bundle eliminates crosstalk by virtue of its limited acceptance cone, ensuring that the output pattern is sharp and fully resolvable.…”