Monolithic image chip for near-to-eye display
View Patent ↗A set of light emitting devices can be formed on a substrate. A growth mask having a first aperture in a first area and a second aperture in a second area is formed on a substrate. A first nanowire and a second nanowire are formed in the first and second apertures, respectively. The first nanowire includes a first active region having a first band gap and a second active region having a second band gap. The first band gap is greater than the second band gap. The second nanowire includes an active region having the first band gap and does not include, or is adjoined to, any material having the second band gap.
1. A display device including light emitting devices, comprising:
a first light emitting device containing a first semiconductor active region located over a substrate, wherein the first semiconductor active region has a first band gap that emits light at a first wavelength; and
a second light emitting device containing a second semiconductor active region located over the substrate and a conversion medium overlying the second semiconductor active region, wherein the conversion medium converts shorter wavelength light emitted from the second semiconductor active region to light having a target color;
wherein:
the first semiconductor active region is located in a first nanowire;
the second semiconductor active region is located in a second nanowire;
the second semiconductor active region has the first band gap;
the conversion medium comprises an inorganic phosphor, organic luminescent material or quantum dots; and
the conversion medium generates the target color having a longer wavelength than the shorter wavelength light emitted from the second semiconductor active region, and direct emission from the first light emitting device generates an additional color to achieve different color subpixels in a display.