Reducing orders of diffraction patterns

Patent metadata

Field	Value
Publication number	US-10310335-B2
Application number	US-201615257581-A
Country	US
Kind code	B2
Filing date	Sep 6, 2016
Priority date	Feb 29, 2016
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Examples are disclosed relating to reducing orders of diffraction patterns in phase modulating devices. An example phase modulating device includes a phase modulating layer having first and second opposing sides, a common electrode adjacent the first side of the phase modulating layer, a plurality of pixel electrodes adjacent the second side of the phase modulating layer, and blurring material disposed between the phase modulating layer and the pixel electrodes. In the example phase modulating device, the blurring material is configured to smooth phase transitions in the phase modulating layer between localized areas associated with the pixel electrodes, the pixel electrodes have a pixel pitch by which the pixel electrodes are distributed along the phase modulating layer, and the pixel electrodes are separated from one another by an inter-pixel gap, where the ratio of the inter-pixel gap to the pixel pitch is between 0.50 and 1.0.

First claim

The invention claimed is:

1. An image forming system with a phase modulating device, comprising:
a phase modulating layer having first and second opposing sides;
a common electrode adjacent the first side of the phase modulating layer;
a plurality of pixel electrodes adjacent the second side of the phase modulating layer, where for each of the plurality of pixel electrodes, application of a voltage to that pixel electrode produces a voltage drop between that pixel electrode and the common electrode across a respective localized area of the phase modulating layer;
where the pixel electrodes have a pixel pitch by which the pixel electrodes are distributed along the second side of the phase modulating layer;
where the pixel electrodes are separated from one another by an inter-pixel gap, where the ratio of the inter-pixel gap to the pixel pitch is between 0.50 and 1.0; and
the phase modulating device further comprising a blurring material disposed between the phase modulating layer and the pixel electrodes, the blurring material having a higher permittivity than the phase modulating layer, and configured to smooth phase transitions of a liquid crystal state in the phase modulating layer between the localized areas associated with the pixel electrodes.

2. The image forming system of claim 1 , wherein a ratio of the permittivity of the blurring material to the thickness of the blurring material is greater than 100 times the ratio of the permittivity of the phase modulating layer to the thickness of the phase modulating layer.

3. The image forming system of claim 1 , wherein each of the plurality of pixel electrodes is disposed on a silicon backplane and wherein the phase modulating layer includes a liquid crystal layer.

4. The image forming system of claim 1 , wherein the blurring material includes a dielectric mirror.

5. The image forming system of claim 1 , wherein the blurring material comprises Lead Zirconate Titanate (PZT).

6. The image forming system of claim 1 , further comprising a plurality of reflective elements disposed between the blurring material and the phase modulating layer.

7. The image forming system of claim 1 , wherein a dielectric mirror is disposed within at least one inter-pixel gap.

8. The image forming system of claim 1 , wherein a quarter waveplate is disposed within at least one inter-pixel gap.

9. The image forming system of claim 1 , wherein insulating material is disposed within at least one inter-pixel gap.

10. The image forming system of claim 1 , wherein the pixel electrodes comprise carbon nano-tubes.

11. The image forming system of claim 1 , wherein the height of each pixel electrode is less than a thickness of material disposed within the inter-pixel gaps.

12. The image forming system of claim 1 , wherein at least one pixel electrode protrudes into the blurring material.

13. A phase modulating device, comprising:
a liquid crystal layer having first and second opposing sides;
a common electrode adjacent the first side of the liquid crystal layer;
a plurality of pixel electrodes adjacent the second side of the liquid crystal layer, where for each of the plurality of pixel electrodes, application of a voltage to that pixel electrode produces a voltage drop between that pixel electrode and the common electrode across a respective localized area of the liquid crystal layer;
where the pixel electrodes have a pixel pitch by which the pixel electrodes are distributed along the second side of the liquid crystal layer;
where the pixel electrodes are separated from one another by an inter-pixel gap, where the ratio of the inter-pixel gap to the pixel pitch is between 0.5 and 1.0;
where insulating material is disposed within at least one of the inter-pixel gaps;
the phase modulating device further comprising a blurring material disposed between the liquid crystal layer and the pixel electrodes, the blurring material having a higher permittivity than the liquid crystal layer, and configured to smooth phase transitions of a liquid crystal state in the liquid crystal layer between the localized areas associated with the pixel electrodes; and
the phase modulating device further comprising a plurality of reflective elements disposed between the blurring material and the second side of the liquid crystal layer.

14. The phase modulating device of claim 13 , wherein the blurring material comprises Lead Zirconate Titanate (PZT).

15. The phase modulating device of claim 13 , wherein the height of each pixel electrode is less than a thickness of the insulating material disposed within the at least one inter-pixel gap.

16. The phase modulating device of claim 13 , wherein at least one pixel electrode protrudes into the blurring material.

17. The phase modulating device of claim 13 , wherein the pixel electrodes include carbon nano-tubes.

18. A phase modulating device, comprising:
a liquid crystal layer having first and second opposing sides;
a common electrode adjacent the first side of the liquid crystal layer;
a plurality of pixel electrodes adjacent the second side of the liquid crystal layer, where for each of the plurality of pixel electrodes, application of a voltage to that pixel electrode produces a voltage drop between that pixel electrode and the common electrode across a respective localized area of the liquid crystal layer;
where the pixel electrodes have a pixel pitch by which the pixel electrodes are distributed along the second side of the liquid crystal layer;
where the pixel electrodes are separated from one another by an inter-pixel gap, where the ratio of the inter-pixel gap to the pixel pitch is between 0.50 and less than 1.0;
where one or more of a dielectric mirror and a quarter waveplate is disposed within at least one of the inter-pixel gaps; and
the phase modulating device further comprising a blurring material disposed between the liquid crystal layer and the pixel electrodes, the blurring material having a higher permittivity than the liquid crystal layer, and configured to smooth phase transitions of a liquid crystal state in the liquid crystal layer between the localized areas associated with the pixel electrodes.

19. The phase modulating device of claim 18 , wherein the blurring material comprises Lead Zirconate Titanate (PZT).

20. The phase modulating device of claim 18 , wherein the pixel electrodes include carbon nano-tubes.

Assignees

• Microsoft Technology Licensing Llc

Inventors

• Georgiou Andreas
• Kollin Joel S

Classifications

• G03H2225/52

  Reflective modulator · CPC title

• G02F1/133553 Primary

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F2201/305

  diffraction grating · CPC title

• G03H1/2202

  Reconstruction geometries or arrangements · CPC title

• G03H2225/55

  Having optical element registered to each pixel · CPC title