Collimated OLED light field display
The present disclosure generally relates to light field displays and methods of displaying images with light field arrays. In one example, the present disclosure relates to pixel arrangements for use in light field displays. Each pixel includes a plurality of LEDs, such as micro LEDs, positioned adjacent respective micro-lenses of each pixel.
1. A light field display, comprising:
a plurality of micro-lens groups, wherein
each micro-lens group comprises a plurality of micro-lenses,
each micro-lens has a corresponding micro-LED device array positioned therebeneath, the micro-LED device array comprising a plurality of micro-LED devices, and
each micro-LED device in the micro-LED device array comprises a reflective surface formed to collimate light emitted by an active stack of the micro-LED device and to direct the collimated light towards a micro-lens positioned thereabove.
2. The light field display of claim 1 , wherein one or more micro-lenses of a micro-lens group has a concave shape which directs the collimated light from each of micro-LED devices in a respective plurality of directions, each of the directions corresponding to a pixel of angular resolution.
3. The light field display of claim 2 , wherein the micro-lenses in a micro-lens group are arranged in a triangular configuration.
4. The light field display of claim 1 , wherein the micro-lens group includes at least three micro-lenses, wherein the micro-LED devices of a micro-LED array emit the same color of light as each other, and wherein micro-LED device arrays respectively positioned beneath each of the three micro-lenses each collectively emit a different color light from each other.
5. The light field display of claim 4 , wherein one or more of the micro-LED devices comprises:
an active layer stack;
a transparent conductive oxide (TCO) layer disposed on the active layer stack, wherein the transparent conductive oxide (TCO) layer and at least a portion of the active layer stack form a substantially circular paraboloid shape;
an electrically insulating layer disposed on the transparent conductive oxide (TCO) layer, the electrically insulating layer having an opening formed therein; and
a reflective layer disposed on the electrically insulating layer, wherein the reflective layer comprises the reflective surface, and wherein an axis of symmetry of the reflective surface is orthogonal to parallel surfaces of the active layer stack.
6. The light field display of claim 5 , wherein the colors of light collectively emitted from each of the micro-LED arrays respectively positioned beneath each of at least three micro-lenses comprise red, green, and blue.
7. The light field display of claim 1 , wherein the micro-LED devices of the micro-LED device arrays are arranged in a hexagonal pattern.
8. A light-field display, comprising:
a plurality of pixels of spatial resolution, each pixel of spatial resolution comprising:
a plurality micro-LED arrays, each micro-LED array comprising a monochromatic plurality of micro-LED devices; and
a plurality of micro-lens respectively positioned above each micro-LED array, wherein each of the micro-LED devices in a micro-LED array is configured to direct collimated light towards a corresponding micro-lens, and wherein the corresponding micro-lens changes the directions of the collimated light from a plurality of the micro-LED devices to provide a corresponding plurality of pixels of angular resolution.
9. The light-field display of claim 8 , wherein a pixel of spatial resolution comprises a plurality of micro-LED arrays, wherein each micro-LED array has a corresponding micro-lens of a plurality of micro-lenses positioned thereover, and wherein colors of light provided by at least two of the micro-LED arrays are different from each other.
10. The light-field display of claim 8 , wherein each of the micro-lenses of comprises a concave shape.
11. The light-field display of claim 10 , wherein each pixel of spatial resolution comprises at least three concave lenses arranged in a triangular configuration.
12. The light-field display of claim 8 , wherein each micro-LED array comprises at least three micro-LED devices.
13. The light-field display of claim 8 , wherein the plurality of micro-LED devices of each micro-LED array are arranged in a hexagonal pattern.
14. A light-field display, comprising:
a plurality of pixels of spatial resolution, each pixel of spatial resolution comprising:
one or more light-directing features formed on a substrate panel; and
a corresponding micro-LED device positioned beneath each of the one or more light-directing features, the corresponding micro-LED device comprising an active stack and a reflective layer used to collimate light emitted by the active stack and to direct the collimated light towards the corresponding light directing feature.
15. The light-field display of claim 14 , wherein micro-LED devices emitting the same color of light are arranged in linear strips or clusters.
16. The light-field display of claim 15 , wherein the linear strips or clusters are positioned in closely-packed arrays.
17. The light-field display of claim 14 , wherein the substrate panel spans the plurality of pixels of spatial resolution.
18. The light-field display of claim 14 , wherein the reflective layer forms a substantially circular parabolic mirror.
19. The light field display of claim 18 , wherein one or more of the micro-LED devices comprises:
the active layer stack;
a transparent conductive oxide (TCO) layer disposed on the active layer stack, wherein the transparent conductive oxide (TCO) layer and at least a portion of the active layer stack form a substantially circular paraboloid shape;
an electrically insulating layer disposed on the transparent conductive oxide (TCO) layer, the electrically insulating layer having an opening formed therein; and
the reflective layer disposed on the electrically insulating layer, wherein the reflective layer comprises a reflective surface, and wherein an axis of symmetry of the reflective surface is orthogonal to parallel surfaces of the active layer stack.