Multiview backlight, display, and method employing active emitter arrays

Patent metadata

Field	Value
Publication number	US-11011121-B2
Application number	US-201916663167-A
Country	US
Kind code	B2
Filing date	Oct 24, 2019
Priority date	May 14, 2017
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

A multiview backlight includes a first array active emitters configured to provide a first plurality of directional light beams and a second array of active emitters configured to provide a second plurality of directional light beams. The second array of active emitters is interleaved between active emitters of the first array of active emitters. Further, directional light beams of each of the first and second directional light beam pluralities have directions corresponding to view directions of a multiview display. A multiview display further includes an array of light valves configured to modulate the directional light beams to display a multiview image. An image resolution of the multiview image is configured to be dynamically selectable according to operational mode.

First claim

What is claimed is:

1. A multiview backlight comprising:
a first array of active emitters spaced apart from one another, an active emitter of the first array of active emitters being configured to provide a first plurality of directional light beams having directions corresponding to view directions of a multiview display;
a second array of active emitters interleaved between active emitters of the first array of active emitters, an active emitter of the second array of active emitters being configured to provide a second plurality of directional light beams having directions corresponding to the view directions of the multiview display; and
a broad-angle backlight configured to provide broad-angle emitted light, a combination of the first and second arrays of active emitters being configured to be transparent to the broad-angle emitted light,
wherein the active emitters of the first and second active emitter arrays have a size comparable to a size of a view pixel of the multiview display.

2. The multiview backlight of claim 1 , wherein a distance between adjacent active emitters within one or both of the first array of active emitters and the second array of active emitters is comparable to a distance between adjacent multiview pixels of the multiview display.

3. The multiview backlight of claim 1 , wherein active emitters of the second array of active emitters are halfway between adjacent active emitters of the first active emitter array.

4. The multiview backlight of claim 1 , wherein the active emitter of one or both of the first array of active emitters and the second array of active emitters comprises a micro light emitting diode (μLED).

5. The multiview backlight of claim 1 , wherein the active emitter of one or both of the first array of active emitters and the second array of active emitters comprises an organic light emitting diode (OLED).

6. The multiview backlight of claim 1 , wherein the active emitter of the first array of active emitters is configured to provide the first plurality of directional light beams during a first time interval and the active emitter of the second array of active emitters is configured to provide the second plurality of directional light beams during a second time interval, the first and second time intervals being alternating, sequential time intervals.

7. The multiview backlight of claim 1 , wherein the first array of active emitters is configured to provide the first plurality of directional light beams during a first mode of the multiview backlight, and wherein both the first array of active emitters is configured to provide the first plurality of directional light beams and the second array of active emitters is configured to provide the second plurality of directional light beams during a second mode of the multiview backlight.

8. The multiview backlight of claim 1 , further comprising a planar substrate adjacent to the broad-angle backlight and configured to be optically transparent to the broad-angle emitted light, active emitters of the first and second active emitter arrays being spaced apart across a surface of the planar substrate.

9. A display comprising the multiview backlight of claim 1 , the display further comprising an array of light valves configured to modulate directional light beams of one or both of the first plurality of directional light beams and the second plurality of directional light beams to provide a multiview image, a view pixel corresponding to a light valve of the array of light valves, a multiview pixel corresponding to a set of light valves of the array of light valves, and the display being the multiview display.

10. A multiview display comprising:
a first active emitter array configured to provide directional light beams having directions corresponding to view directions of a multiview image;
a second active emitter array interleaved with the first active emitter array on a surface of a substrate, the second active emitter array being configured to provide directional light beams having directions corresponding to the view directions of the multiview image;
a broad-angle backlight configured to provide broad-angle light, the broad-angle backlight being adjacent to another surface of substrate opposite to the surface on which the first and second active emitter arrays are interleaved; and
an array of light valves configured to modulate the directional light beams provided by one or both of first and second active emitter arrays to display the multiview image,
wherein a combination of the first and second active emitter arrays and the substrate is configured to be transparent to the broad-angle emitted light, an image resolution of the multiview image being configured to be dynamically selectable according to an operational mode.

11. The multiview display of claim 10 , wherein one or both of a size of an active emitter of the first and second active emitter arrays is commensurate to a size of a light valve of the array of light valves and a shape of the active emitter is comparable to a shape of a multiview pixel of the multiview display.

12. The multiview display of claim 10 , wherein active emitters of the first and second active emitter arrays comprise one or both of a micro light emitting diode and an organic light emitting diode.

13. The multiview display of claim 10 , wherein the image resolution of the multiview image has a first value in a first operational mode and a second value in a second operational mode, the first operational mode comprising the first active emitter array being activated to provide the directional light beams and the second active emitter being inactivated.

14. The multiview display of claim 13 , wherein the second operational mode comprises both the first active emitter array and the second active emitter array being activated to simultaneously provide the directional light beams.

15. The multiview display of claim 13 , wherein the second operational mode comprises the first active emitter array being activated to provide the directional light beams during a first time interval and the second active emitter array being activated to provide the directional light beams during a second time interval, the first and second time intervals being alternating, sequential time intervals.

16. A method of multiview backlight operation, the method comprising:
emitting a first plurality of directional light beams using a first array of active emitters, directional light beams of the first plurality of directional light beams having directions corresponding to view directions of a multiview image; and
emitting a second plurality of directional light beams using a second array of active emitters interleaved with active emitters of the first active emitter array, directional light beams of the second plurality of directional light beams having directions corresponding to the view directions of the multiview image;
emitting broad-angle emitted light using a broad-angle backlight adjacent to a substrate supporting the first and second arrays of active emitters, a combination of the first and second arrays of active emitters and the substrate being transparent to the broad-angle emitted light,
wherein the active emitters have a size comparable to a size of a view pixel of a multiview display used to display the multiview image.

17. The method of multiview backlight operation of claim 16 , further comprising modulating one or both of the first plurality of directional light beams and the second plurality of light beams using an array of light valves to display the multiview image.

Assignees

• Leia Inc

Inventors

• Fattal David A
• Ma Ming
• Li Xuejian

Classifications

• G09G2320/028

  by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction · CPC title

• G09G3/342 Primary

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G3/3473

  based on light coupled out of a light guide, e.g. due to scattering, by contracting the light guide with external means · CPC title

• H04N13/30

  Image reproducers (optical systems for producing stereoscopic or other three-dimensional [3D] effects G02B30/00) · CPC title

• G02B6/122

  Basic optical elements, e.g. light-guiding paths · CPC title