LED display with wavelength conversion layer
A display and method of manufacture are described. The display may include a substrate including an array of pixels with each pixel including multiple subpixels, and each subpixel within a pixel is designed for a different color emission spectrum. An array of micro LED device pairs are mounted within each subpixel to provide redundancy. An array of wavelength conversion layers comprising phosphor particles are formed over the array of micro LED device pairs for tunable color emission spectrum.
1. A display panel comprising:
a display substrate including an array of pixels, each pixel including multiple subpixels, with each of the subpixels designed for a different color emission spectrum;
an array of micro LED device pairs, wherein a pair of micro LED devices is mounted within each subpixel;
an array of wavelength conversion layers comprising phosphor particles over the array of micro LED device pairs;
a ground line on or within the display substrate; and
one or more top electrode layers electrically connecting the array of micro LED device pairs to the ground line.
2. The display panel of claim 1 , wherein the array of wavelength conversion layers comprises multiple groups of wavelength conversion layers, with each group designed to emit a different color emission spectrum, and the different groups of wavelength conversion layers are separated into different subpixels.
3. The display panel of claim 2 , wherein a wavelength conversion layer is not formed over a micro LED device pair for one of the subpixels.
4. The display panel of claim 2 , wherein the array of micro LED device pairs is designed to emit a single color emission spectrum.
5. The display panel of claim 1 , wherein the array of micro LED device pairs includes groups of micro LED device pairs, with each group designed to emit a different color emission spectrum, and the different groups of micro LED device pairs are separated into different subpixels.
6. The display panel of claim 5 , wherein a wavelength conversion layer is formed over a first group of micro LED device pairs in a first subpixel, and a wavelength conversion layer is not formed over a second group of micro LED device pairs in a second subpixel.
7. The display panel of claim 1 , wherein each wavelength conversion layer is formed over only a single micro LED device.
8. The display panel of claim 1 , wherein each wavelength conversion layer is formed over a micro LED device pair.
9. The display panel of claim 1 , wherein the wavelength conversion layers are dome shaped.
10. The display panel of claim 9 , wherein the wavelength conversion layers have a shape selected from the group consisting of: a hemispherical outer surface and elongated dome shaped.
11. The display panel of claim 1 , further comprising an array of light distribution layers between the array of wavelength conversion layers and corresponding micro LED device pairs.
12. The display panel of claim 11 , wherein the light distribution layers are light pipes, each light distribution layer is characterized with a lateral length that is greater than a thickness of the light distribution layer.
13. The display panel of claim 12 , wherein each light distribution layer in the form of a light pipe spans over more than one subpixel and the micro LED device pairs mounted within the more than one subpixel.
14. The display panel of claim 12 , wherein each light distribution layer in the form of a light pipe spans over all of the multiple subpixels within a corresponding pixel and the micro LED device pairs mounted within the multiple subpixels of the pixel.
15. The display panel of claim 12 , wherein each light distribution layer in the form of a light pipe spans over no more than one subpixel and the micro LED device pairs mounted within the subpixel.
16. The display panel of claim 1 , wherein the phosphor particles are quantum dots.
17. The display panel of claim 1 , wherein the phosphor particles exhibit luminescence due to their composition that do not qualify as quantum dots.
18. The display panel of claim 1 , wherein the micro LED devices each have a maximum width of 1 μm-100 μm.
19. The display panel of claim 1 , further comprising a reflective bank layer corresponding to each subpixel, wherein each reflective bank layer is independently addressable from working circuitry within the display substrate.
20. The display panel of claim 1 , wherein the one or more top electrode layers comprise a first top electrode layer electrically connecting a first micro LED device of a micro LED device pair to the ground line, and a separate top electrode layer connecting a second micro LED device of the micro LED device pair to the ground line.
21. The display panel of claim 1 , further comprising an array of ground tie lines on or within the display substrate; and
wherein the one or more top electrode layers electrically connect the array of micro LED device pairs to the array of ground tie lines, and the array of ground tie lines is electrically connected to the ground line.
22. The display panel of claim 1 , wherein the one or more top electrode layers comprise a transparent conductive oxide.