Plasmonic aluminum particle based display device and related methods

Patent metadata

Field	Value
Publication number	US-10921680-B2
Application number	US-201916710507-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 11, 2018
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A display device may include a substrate, a plasmonic aluminum reflector layer over the substrate, and a conducting oxide layer over the plasmonic aluminum reflector layer. The display device may have a circular polarizer over the conducting oxide layer and configured to receive incident visible radiation. The incident visible radiation may cause plasmon resonance within the plasmonic aluminum reflector layer. The display device may include a circuit configured to apply a voltage between the conducting oxide layer and the plasmonic aluminum reflector layer to cause the plasmonic aluminum reflector layer to selectively reflect the incident visible radiation based on the voltage.

First claim

That which is claimed is:

1. A display device comprising:
a substrate;
a plasmonic aluminum reflector layer over said substrate and comprising an aluminum mirror layer, an oxide layer over said aluminum mirror layer, and a layer of self-assembled aluminum particles over said oxide layer;
a liquid crystal layer over said plasmonic aluminum reflector layer;
a circular polarizer over said liquid crystal layer and configured to receive incident visible radiation, the incident visible radiation causing plasmon resonance within said plasmonic aluminum reflector layer; and
a circuit configured to apply a voltage between said liquid crystal layer and said plasmonic aluminum reflector layer to cause said plasmonic aluminum reflector layer to selectively reflect the incident visible radiation based on the voltage for generating perceived light, or selectively absorb a spectral portion of the incident visible radiation.

2. The display device of claim 1 wherein said circular polarizer comprises a quarter-wave plate over said liquid crystal layer, and a linear polarizer over said quarter-wave plate and configured to receive the incident visible radiation.

3. The display device of claim 1 further comprising a first polyimide layer over said plasmonic aluminum reflector layer, a second polyimide layer over said liquid crystal layer, and a conducting oxide layer over said second polyimide layer.

4. The display device of claim 3 wherein said liquid crystal layer comprises a twisted nematic (MTN) liquid crystal display layer.

5. The display device of claim 1 wherein said oxide layer comprises an aluminum oxide layer.

6. The display device of claim 1 wherein the plasmon resonance within said plasmonic aluminum reflector layer is independent to an angle of incidence for the incident visible radiation.

7. The display device of claim 1 further comprising display circuitry carried by said substrate.

8. A display device comprising:
a substrate;
a plasmonic aluminum reflector layer over said substrate;
a first polyimide layer over said plasmonic aluminum reflector layer;
a liquid crystal layer over said first polyimide layer;
a second polyimide layer over said liquid crystal layer;
a conducting oxide layer over said second polyimide layer;
a quarter-wave plate over said conducting oxide layer;
a linear polarizer over said quarter-wave plate and configured to receive incident visible radiation, the incident visible radiation causing plasmon resonance within said plasmonic aluminum reflector layer; and
a circuit configured to apply a voltage between said conducting oxide layer and said plasmonic aluminum reflector layer to cause said plasmonic aluminum reflector layer to selectively reflect the incident visible radiation based on the voltage.

9. The display device of claim 8 wherein said liquid crystal layer comprises a twisted nematic (MTN) liquid crystal display layer.

10. The display device of claim 8 wherein said plasmonic aluminum reflector layer comprises an aluminum mirror layer, an oxide layer over said aluminum mirror layer, and a layer of self-assembled aluminum particles over said oxide layer.

11. The display device of claim 10 wherein said layer of self-assembled aluminum particles is configured to selectively absorb a spectral portion of the incident visible radiation.

12. The display device of claim 10 wherein said oxide layer comprises an aluminum oxide layer.

13. The display device of claim 8 wherein the plasmon resonance within said plasmonic aluminum reflector layer is independent to an angle of incidence for the incident visible radiation.

14. The display device of claim 8 further comprising display circuitry carried by said substrate.

15. A method of making a display device comprising:
forming a plasmonic aluminum reflector layer over a substrate, the plasmonic aluminum reflector layer comprising an aluminum mirror layer, an oxide layer over the aluminum mirror layer, and a layer of self-assembled aluminum particles over the oxide layer;
forming a liquid crystal layer over the plasmonic aluminum reflector layer;
forming a circular polarizer over the liquid crystal layer and configured to receive incident visible radiation, the incident visible radiation causing plasmon resonance within the plasmonic aluminum reflector layer; and
coupling a circuit configured to apply a voltage between the liquid crystal layer and the plasmonic aluminum reflector layer to cause the plasmonic aluminum reflector layer to selectively reflect the incident visible radiation based on the voltage for generating perceived light, or selectively absorb a spectral portion of the incident visible radiation.

16. The method of claim 15 wherein the circular polarizer comprises a quarter-wave plate over the liquid crystal layer, and a linear polarizer over the quarter-wave plate and configured to receive the incident visible radiation.

17. The method of claim 15 further comprising forming a first polyimide layer over the plasmonic aluminum reflector layer, forming a second polyimide layer over the liquid crystal layer, and forming a conducting oxide layer over the second polyimide layer.

18. A method of making a display device comprising:
forming a plasmonic aluminum reflector layer over a substrate;
forming a conducting oxide layer over the plasmonic aluminum reflector layer;
forming a circular polarizer over the conducting oxide layer and configured to receive incident visible radiation, the incident visible radiation causing plasmon resonance within the plasmonic aluminum reflector layer;
forming a first polyimide layer over the plasmonic aluminum reflector layer, forming a liquid crystal layer over the first polyimide layer, and forming a second polyimide layer over the liquid crystal layer; and
coupling a circuit configured to apply a voltage between the conducting oxide layer and the plasmonic aluminum reflector layer to cause the plasmonic aluminum reflector layer to selectively reflect the incident visible radiation based on the voltage.

Assignees

• Univ Central Florida Res Found Inc

Inventors

• Chanda Debashis
• Franklin Daniel

Classifications

• G02F2203/15

  involving resonance effects, e.g. resonantly enhanced interaction · CPC title

• G02F1/19 Primary

  based on variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169 · CPC title

• G02F1/133541

  Circular polarisers · CPC title

• G02F2203/34

  Colour display without the use of colour mosaic filters · CPC title

• G02F2203/02

  reflective · CPC title