Optical display system with regionally addressable electrochromic light modulator

Patent metadata

Field	Value
Publication number	US-12078907-B2
Application number	US-202318375662-A
Country	US
Kind code	B2
Filing date	Oct 2, 2023
Priority date	Apr 4, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

An optical display system includes a first display, a plurality of electronic drivers, a controller, and a combiner. Light from a scene is combined with image light from the first display, and the combined light presented to an observer. The combiner includes an electrochromic layer comprising one or more electrochromic regions disposed between the scene and the combiner. The electronic drivers are arranged to electrically connect with and drive respective of the electrochromic regions. The controller is configured to control the plurality of electronic drivers to individually address each of the electrochromic regions to selectively drive some of the electrochromic regions to change light transmission of the selectively driven electrochromic regions.

First claim

We claim:

1. An optical display system comprising:
a first display;
an electrochromic layer including one or more electrochromic regions separated from each other;
a combiner arranged to combine an image from a scene and an image from the first display to provide a combined image, wherein the combiner is separated from the first display and the electrochromic layer is disposed between the scene and the combiner;
one or more electronic drivers arranged to electrically connect with and drive respective of the electrochromic regions;
and
a controller configured to control the one or more electronic drivers to individually address each of the plurality of one or more electrochromic regions to selectively drive by applying a potential difference to one or more selectively driven electrochromic regions of the one or more electrochromic regions to change light transmission of the one or more selectively driven electrochromic regions,
wherein the electrochromic layer is associated with a first index of refraction, and the combiner comprises:
a high light transmissive side oriented to the scene;
a high reflectivity side oriented to the first display, wherein the high reflectivity is caused by a coating for the electrochromic layer, the coating associated with a second index of refraction different than the first index of refraction;
and
an index matching material.

2. The optical display system of claim 1 , wherein the first display further comprises:
a display region including one or more content regions and one or more non-content regions;
wherein the controller is configured to control the electronic drivers to address the plurality of electrochromic regions so that electrochromic regions corresponding to the one or more content regions are decreased in light transmission, and electrochromic regions corresponding to the one or more non-content regions are not decreased in light transmission.

3. The optical display system of claim 2 , wherein:
the controller is configured to designate at least one content region of the one or more content regions according to one or more designations including at least a first designation and a second designation;
and
wherein the controller is configured to adjust the potential difference such that at least one content region associated with the first designation has a higher contrast than at least one content region associated with the second designation.

4. The optical display system of claim 2 , wherein the light transmission is reduced without moving mechanical parts.

5. The optical display system of claim 1 , wherein:
a light transmission of the one or more selectively driven electrochromic regions decreases when the potential difference increases;
and
wherein the controller is configured to allow the light transmission in each of the one or more electrochromic regions to be non-uniform.

6. The optical display system of claim 1 , wherein the first display is a liquid crystal display (LCD).

7. The optical display system of claim 1 , wherein the display is one of an organic light emitting diode (LED) display, or a micro-LED display.

8. The optical display system of claim 1 , wherein the display is one of a helmet mounted display (HMD) or a head worn display (HWD).

9. The optical display system of claim 1 , wherein the display is a heads-up display (HUD).

10. The optical display system of claim 1 , wherein the high reflectivity side is highly reflective only for a wavelength range displayed on the first display.

11. The optical display system of claim 1 , wherein the one or more electrochromic regions are arranged in an array.

12. The optical display system of claim 1 , wherein the one or more electrochromic regions are arranged as a plurality of parallel strips.

13. The optical display system of claim 1 , wherein the one or more electrochromic regions do not overlap.

14. The optical display system of claim 1 , wherein the one or more electrochromic regions overlap.

15. The optical display system of claim 1 , wherein the one or more electrochromic regions are circular.

16. The optical display system of claim 1 , wherein the one or more electrochromic regions are concentric.

17. The optical display system of claim 1 , wherein the one or more electronic drivers are electrically connected to the one or more electrochromic regions with a wiring layer.

18. The optical display system of claim 1 , further comprising at least one light sensor configured to:
detect a light level;
and
when the light sensor detects a change in the light level, cause the controller to direct the one or more electric drivers to change the potential difference applied to at least one of the one or more electrochromic regions in order to change light transmission in the at least one of the one or more electrochromic regions.

Assignees

• Rockwell Collins Inc

Inventors

• Tiana Carlo L
• Stratton Eric P
• Keith Christopher A
• Brown Robert D
• Wood Robert W

Classifications

• G02F1/133602

  Direct backlight · CPC title

• G02F1/13318

  Circuits comprising a photodetector · CPC title

• G02B27/10

  Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; {beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905}) · CPC title

• G02F1/163 Primary

  Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor · CPC title