Optical display system with regionally addressable electrochromic light modulator

Patent metadata

Field	Value
Publication number	US-11809054-B2
Application number	US-202117197459-A
Country	US
Kind code	B2
Filing date	Mar 10, 2021
Priority date	Apr 4, 2018
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

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 separated from each other. 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, configured to operate at low brightness levels by reducing a minimum brightness of the first display;
a combiner arranged to combine at least one image from a scene and an image from the first display to provide a combined image, the combiner including an electrochromic layer including one or more electrochromic regions separated from each other, wherein the combiner is separated from the first display and comprises:
a high light transmissive side oriented to the scene;
a high reflectivity side oriented to the first display, wherein a coating for the electrochromic layer having an index of refraction different than the index of refraction of the electrochromic layer causes the high reflectivity;
and
an index matching material;
one or more electronic drivers arranged to electrically connect with and drive respective of the one or more electrochromic regions;
and
a controller configured to control the one or more electronic drivers to individually address each of the one or more electrochromic regions to selectively drive by applying a potential difference to some of the one or more electrochromic regions to change light transmission of the selectively driven one or more electrochromic regions;
wherein the light transmission of the selectively driven one or more 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.

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

3. The optical display system of claim 1 , wherein the display system includes one of a head-worn display (HWD) and a helmet-mounted display (HMD).

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

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

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

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

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

9. 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.

10. The optical display system of claim 1 , wherein the light transmission is reduced without moving mechanical parts.

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

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

13. The optical display system of claim 1 , wherein the one or more electrochromic regions are arranged in a plurality of concentric circles.

14. 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.

15. The optical display system of claim 14 , wherein the wiring layer is made from a transparent material.

16. The optical display system of claim 15 , wherein the transparent material is indium titanium oxide (ITO).

17. The optical display system of claim 4 , wherein the controller is configured to give the at least one content region one of one or more designations.

18. The optical display system of claim 17 , wherein the one or more designations comprises:
a first designation;
and
a second designation.

19. The optical display system of claim 18 , wherein the controller is configured to alter the potential difference, such that a content region with the first designation has a higher contrast than a content region with the second designation.

20. The optical display system of claim 1 , further comprising a light sensor, the light sensor configured to detect a light level and 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 when the light sensor detects a change in the light level.

Assignees

• Rockwell Collins Inc

Inventors

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

Classifications

• G02F1/163 Primary

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

• G02F1/13318

  Circuits comprising a photodetector · CPC title

• G02F1/133602

  Direct backlight · 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