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US 11,694,998 B2Granted
Light-emitting diodes with light coupling and conversion layers
AssigneeKateeva, Inc.
InventorFlorian Pschenitzka
Life of this patent
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Abstract
Light-emitting sub-pixels and pixels for micro-light-emitting diode-based displays are provided. Also provided are methods of fabricating individual sub-pixels, pixels, and arrays of the pixels. The sub-pixels include a double-layered film that includes a coupling layer disposed over a light-emitting diode and a light-emission layer disposed over the coupling layer.
Claims21
A pixel comprising:
- a substrate;
- a red sub-pixel on the substrate, the red sub-pixel comprising:
- a first light-emitting diode;
- a first dome-shaped scattering layer disposed over the first light-emitting diode;
- and
- a red light-emission layer comprising red-emitting particles and scattering particles disposed in a polymeric matrix disposed over the first scattering layer;
- a green sub-pixel on the substrate, the green sub-pixel comprising:
- a second light-emitting diode;
- a second dome-shaped scattering layer disposed over the second light-emitting diode;
- and
- a green light-emission layer comprising green-emitting particles and scattering particles disposed in a polymeric matrix disposed over the second scattering layer;
- and
- a blue sub-pixel on the substrate, the blue sub-pixel comprising:
- a third light-emitting diode.
11 more elements
A pixel comprising:
- a substrate;
- a red sub-pixel on the substrate, the red sub-pixel comprising:
- a first light-emitting diode;
- a first dome-shaped scattering layer disposed over the first light-emitting diode;
- and
- a red light-emission layer comprising red-emitting particles and scattering particles disposed in a polymeric matrix disposed over the first scattering layer;
- a green sub-pixel on the substrate, the green sub-pixel comprising:
- a second light-emitting diode;
- a second dome-shaped scattering layer disposed over the second light-emitting diode;
- and
- a green light-emission layer comprising green-emitting particles and scattering particles disposed in a polymeric matrix disposed over the second scattering layer;
- and
- a blue sub-pixel on the substrate, the blue sub-pixel comprising:
- a third light-emitting diode, wherein the first scattering layer is separated from the red light-emission layer by an interfacial region having a gradient in which the concentration of red-emitting particles in the interfacial region is lower near the first scattering layer than near the red light-emission layer, and/or wherein the second scattering layer is separated from the green light-emission layer by an interfacial region having a gradient in which the concentration of green-emitting particles in the interfacial region is lower near the second scattering layer than near the green light-emission layer.
11 more elements
A color conversion display device comprising:
- a display device substrate;
- a plurality of pixels arranged on the display device substrate, each pixel in the plurality of pixels comprising:
- a substrate;
- a red sub-pixel on the substrate, the red sub-pixel comprising:
- a first light-emitting diode;
- a first dome-shaped scattering layer disposed over the first light-emitting diode;
- and
- red light-emission layer comprising red-emitting particles and scattering particles disposed in a polymeric matrix disposed over the first scattering layer;
- a green sub-pixel on the substrate, the green sub-pixel comprising:
- a second light-emitting diode;
- a second dome-shaped scattering layer disposed over the second light-emitting diode;
- and
- a green light-emission layer comprising green-emitting particles and scattering particles disposed in a polymeric matrix disposed over the second scattering layer;
- and
- a blue sub-pixel on the substrate, the blue sub-pixel comprising:
- a third light-emitting diode;
- and
- a translucent protective layer disposed over the plurality of pixels.
15 more elements
A method of forming a pixel on a substrate comprising a first light emitting-diode, a second light-emitting diode, and a third light-emitting diode, the method comprising:
- forming a first confinement feature over the first light-emitting diode;
- depositing a first film-forming composition comprising scattering particles and curable organic molecules over the first light-emitting diode;
- curing the first film-forming composition to form a first scattering layer;
- depositing a first light emissive particle containing composition comprising red-emitting particles, scattering particles, and curable organic molecules over the first scattering layer;
- curing the first light emissive particle containing composition to form a red light-emission layer;
- forming a second confinement feature over the second light-emitting diode;
- depositing a second film-forming composition comprising scattering particles and curable organic molecules over the second light-emitting diode;
- curing the second film-forming composition to form a second scattering layer;
- depositing a second light emissive particle containing composition comprising green-emitting particles, scattering particles, and curable organic molecules over the second scattering layer;
- and
- curing the second light emissive particle containing composition to form a green light-emission layer.
8 more elements
A method of forming a display, the method comprising:
- forming a plurality of pixels on a semiconductor substrate each pixel comprising a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the pixels are formed by:
- forming a first light-emitting diode, a second light-emitting diode, and a third light-emitting diode on the semiconductor substrate;
- forming a first confinement feature over the first light-emitting diode;
- forming a second confinement feature over the second light-emitting diode;
- forming a red light emission-layer over the first light-emitting diode by depositing an ink comprising red-emitting particles and scattering particles over the first light-emitting diode and curing the ink to provide the red sub-pixel;
- forming a green light emission layer over the second light-emitting diode in the second confinement feature by depositing an ink comprising green-emitting particles and scattering particles over the second light-emitting diode and curing the ink to provide the green sub-pixel;
- and
- forming a blue light emission layer over the third light-emitting diode by inkjet depositing an ink comprising blue-emitting particles and scattering particles over the third light-emitting diode and curing the ink;
- dicing the substrate into pieces, each of the pieces comprising one or more, but not all, of the pixels;
- and
- transferring one or more of the pieces to a display substrate.
8 more elements
Dependencies are inferred from the claim text.