Directional pixel for multiple view display

• US 10,536,688 B2
• Filed: 03/15/2019
• Issued: 01/14/2020
• Est. Priority Date: 03/01/2017
• Status: Active Grant

• Current Assignee: Avalon Holographics Inc.
• Original Assignee: Avalon Holographics Inc.
• Inventors: Haas, Wally, Campbell-Correa, Jennifer, Hamilton, Matthew, Hill, Stephen, Peckham, Jordan, Rumbolt, Chuck
• Primary Examiner(s): Khan, Ibrahim A
• Application Number:
  US16/355,568
• Publication Number:
  US 20190215510A1
• Time in Patent Office: 305 Days
• CPC Class Codes: G02B 2005/1804 Transmission gratings
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02B 30/33 involving directional light or back-light sources
• CPC Class Codes: H04N 13/32 using arrays of controllable light sources; using moving apertures or moving light sources
• CPC Class Codes: H04N 13/324 Colour aspects
• CPC Class Codes: H04N 13/351 for displaying simultaneously
• CPC Class Codes: H04N 13/363 using image projection screens volumetric display H04N13/388
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 2213/001 Constructional or mechanical details
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

The present disclosure relates to a directional pixel for a high-angular resolution, wide field of view, multiple view display. The design teaches a directional pixel comprising a substrate, one or more pixel driving circuits, one or more nano- or micro-scale subpixels, and one or more directional optical guiding surfaces, wherein each of said one or more subpixels is comprised of a light emitting device emitting a light beam and an optical microcavity housing said light emitting device. The optical microcavity is comprised of a plurality of reflective surfaces to specifically manipulate and tune said light beam, wherein one or more of said reflective surfaces is a light propagating reflective surface which propagates said light beam out of said microcavity, and said light propagating reflective surface is connected to said one or more directional optical guiding surfaces to direct said light beam at a specific angle. A high-angular resolution, multiple-view light-field display is created by deploying a plurality of directional pixels into a directional pixel array system.

Claims

1. A directional pixel comprising:

one or more nano-scale or micro-scale subpixels, each of the subpixels comprising;

a light emitting device; and

an optical microcavity housing the light emitting device, the optical microcavity comprising a first reflective surface, and a second reflective surface positioned above the first reflective surface;

wherein the second reflective surface is a distributed Bragg reflector configured to cause a portion of light beams from the light emitting device to exit the microcavity, and

wherein the second reflective surface comprises a directional optical guiding surface configured to receive and direct the light beams at a particular output angle.

2. The directional pixel of claim 1, comprising one or more pixel driving circuits.

3. The directional pixel of claim 2, wherein each of the one or more subpixels is individually addressable by the one or more pixel driving circuits.

4. The directional pixel of claim 2, wherein each of the one or more pixel driving circuits is dedicated to a corresponding one of the one or more subpixels.

5. The directional pixel of claim 2, wherein at least one of the one or more pixel driving circuits comprises a transistor and a capacitor.

6. The directional pixel of claim 1, wherein the light emitting device comprises one or more organic light emitting diodes or one or more inorganic light emitting diodes.

7. The directional pixel of claim 1, wherein one or more of the reflective surfaces comprises a non-conductive surface.

8. The directional pixel of claim 1, wherein the first reflective surface comprises one or more of a lens and a lens-like surface.

9. The directional pixel of claim 1, wherein the first reflective surface comprises a metasurface having a periodic structure.

10. The directional pixel of claim 1, wherein the second reflective surface comprises one or more of a lens and a lens-like surface.

11. The directional pixel of claim 1, wherein the second reflective surface comprises a metasurface having a periodic structure.

12. A method of operating a directional pixel comprising one or more nano-scale or micro-scale subpixels, the method comprising:

for each of one or more nano-scale or micro-scale subpixels of the directional pixel;

emitting a light beam from a light emitting device of the subpixel, the light emitting device being housed in an optical microcavity formed by a first reflective surface and a second reflective surface of the subpixel,

wherein the second reflective surface is positioned above the first reflective surface; and

receiving and directing the light beam to a particular output angle by the second reflective surface of the optical microcavity, wherein the second reflective surface comprises a distributed Bragg reflector configured to cause the light beam to exit the optical microcavity.

13. The method of claim 12, comprising individually addressing each of the one or more subpixels by a pixel driving circuit of the directional pixel.

14. The method of claim 12, in which emitting the light beam from the light emitting device comprises emitting a light beam from an organic light emitting diode or an inorganic light emitting diode.

15. The method of claim 12, in which receiving and directing the light beam by the second reflective surface comprises directing the light beam by one or more of a lens and a lens-like surface.

16. The method of claim 12, in which receiving and directing the light beam by the second reflective surface comprises directing the light beam by a metasurface.