Self-lit display panel

Patent metadata

Field	Value
Publication number	US-11726252-B2
Application number	US-202217741404-A
Country	US
Kind code	B2
Filing date	May 10, 2022
Priority date	Dec 10, 2021
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A self-lit display panel includes a photonic integrated circuit payer including an array of waveguides and an array of out-couplers for out-coupling portions of the illuminating light through pixels of the panel. The self-lit display panel may include a transparent electronic circuitry layer backlit by the photonic integrated circuit layer; the two layers may be on a same substrate or on opposed substrates defining a cell filled with an electro-active material. The configuration allows for chief ray engineering, zonal illuminating, and separate illumination with red, green, and blue illuminating light.

First claim

What is claimed is:

1. A self-lit display panel comprising:
a first substrate;
a photonic integrated circuit (PIC) layer supported by the first substrate, the PIC layer comprising an array of waveguides for guiding illuminating light;
an electronic circuitry layer supported by the PIC layer; and
a pixelated electrode layer comprising an array of pixel electrodes, wherein the electronic circuitry layer is configured for applying electrical signals to the array of pixel electrodes;
wherein the PIC layer comprises an array of out-couplers coupled to the array of waveguides for out-coupling portions of the illuminating light through the electronic circuitry layer and through the array of pixel electrodes.

2. The self-lit display panel of claim 1 , further comprising:
a second substrate opposite the first substrate;
a backplane electrode layer supported by the second substrate, the pixelated and backplane electrode layers defining a cell; and
an electroactive layer in the cell;
wherein in operation, the illuminating light portions propagate in sequence through the electronic circuitry layer, the pixel electrodes, the electroactive layer, the backplane electrode, and the second substrate.

3. The self-lit display panel of claim 2 , wherein the electroactive layer comprises liquid crystals.

4. The self-lit display panel of claim 1 , wherein the array of out-couplers comprises gratings formed in the array of waveguides.

5. The self-lit display panel of claim 4 , wherein the gratings are slanted to provide a chief ray angle of the portions of the illuminating light spatially varying from one pixel electrode to another.

6. The self-lit display panel of claim 1 , wherein the array of out-couplers comprises an array of nanostructures to provide a chief ray angle of the portions of the illuminating light spatially varying from one pixel electrode to another.

7. The self-lit display panel of claim 1 , wherein:
the illuminating light comprises a plurality of color channels;
each waveguide of the array of waveguides is configured to convey each color channel of the plurality of color channels; and
each out-coupler of the array of out-couplers is configured to out-couple each color channel of the plurality of color channels at a substantially same chief ray angle.

8. The self-lit display panel of claim 7 , wherein the array of waveguides comprises a plurality of sub-arrays, wherein each sub-array is configured to carry a particular color channel of the plurality of color channels of the illuminating light.

9. A self-lit display panel comprising:
first and second opposed substrates;
a photonic integrated circuit (PIC) layer supported by the first substrate, the PIC layer comprising an array of waveguides for guiding illuminating light;
a backplane electrode layer supported by the PIC layer;
an electronic circuitry layer supported by the second substrate;
a pixelated electrode layer comprising an array of pixel electrodes, wherein the electronic circuitry layer is configured for applying electrical signals to the array of pixel electrodes, the pixelated and backplane electrode layers defining a cell; and
an electroactive layer in the cell;
wherein the PIC layer comprises an array of out-couplers coupled to the array of waveguides for out-coupling portions of the illuminating light through the backplane electrode layer, the electroactive layer, and the array of pixel electrodes.

10. The self-lit display panel of claim 9 , wherein the electroactive layer comprises liquid crystals.

11. The self-lit display panel of claim 9 , wherein the array of out-couplers comprises gratings formed in the array of waveguides.

12. The self-lit display panel of claim 11 , wherein the gratings are slanted to provide a chief ray angle of the portions of the illuminating light spatially varying from one pixel electrode to another.

13. The self-lit display panel of claim 9 , wherein the array of out-couplers comprises an array of nanostructures to provide a chief ray angle of the portions of the illuminating light spatially varying from one pixel electrode to another.

14. The self-lit display panel of claim 9 , wherein:
the illuminating light comprises a plurality of color channels;
each waveguide of the array of waveguides is configured to convey each color channel of the plurality of color channels; and
each out-coupler of the array of out-couplers is configured to out-couple each color channel of the plurality of color channels at a substantially same chief ray angle.

15. The self-lit display panel of claim 14 , wherein the array of waveguides comprises a plurality of sub-arrays, wherein each sub-array is configured to carry a particular color channel of the plurality of color channels of the illuminating light.

16. The self-lit display panel of claim 9 , wherein the array of waveguides comprises a plurality of sub-arrays, each sub-array coupled to a beamsplitter for illuminating a particular geometrical area of the array of pixel electrodes.

Assignees

• Meta Platforms Tech Llc

Inventors

• Shi Zhujun
• Patterson Keith
• Parsons Maxwell
• Calafiore Giuseppe
• Hu Yongdan
• Shi Zhimin

Classifications

• G02B6/0036 Primary

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G02B6/0078 Primary

  Side-by-side arrangements, e.g. for large area displays · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F2201/063

  ridge; rib; strip loaded · CPC title