Granted Patent B2

US 9,651,783 · App. 14/834,774 · Granted May 16, 2017

Abstract

Claims (28)

1. A head mounted display with an improved form factor providing a wide display field of view and a high transmission see-through view of the surrounding environment with an overlaid high contrast displayed image comprising:

a. upper optics with a first optical axis including:

i. an emissive image source that provides image light;

ii. one or more lenses;

iii. a stray light trap; and

b. non-polarized lower optics with a second optical axis including:

i. a planar beam splitter angled relative to the first and second optical axes; and

ii. a curved partially reflective mirror;

wherein the head mounted display provides a rectangular image with a reduced vertical field of view and a format that is greater than 22:9 thereby enabling a reduced thickness for the upper and lower optics for a given diagonal display field of view.

2. The head mounted display of claim 1 wherein the wide field of view includes a display field of view of 50 degrees or greater included angle.

3. The head mounted display of claim 1 wherein the emissive image source provides a cone of image light that is greater than 100 degrees included angle.

4. The head mounted display of claim 1 wherein the head mounted display further comprises separate stereoscopic displays for a left eye and a right eye each of which provides a display field of view of 50 degrees or greater and the display field of view for the left and right eyes are only partly overlapped so that the combined field of view is larger than each of the stereoscopic displays.

5. The head mounted display of claim 1 wherein the upper optics includes two or more lenses and a telecentric zone is provided between the two or more lenses in the upper optics, and changes in the focus distance without changes in magnification of the displayed image are provided by changing the spacing between the lenses.

6. The head mounted display of claim 5 wherein a mechanism is provided for manual changes of focus distance.

7. The head mounted display of claim 5 wherein an electrically driven actuator is included to provide automatic changes in focus distance.

8. The head mounted display of claim 7 wherein automatic changes in focus distance are provided to position a portion of the displayed image at an apparent distance that is associated with an augmented reality application.

9. The head mounted display of claim 1 wherein a telecentric zone is provided between the upper optics and lower optics, and changes in the focus distance without changes in magnification of the displayed image are provided by changing the spacing between the upper and lower optics.

10. The head mounted display of claim 9 wherein a mechanism is provided for manual changes of focus distance.

11. The head mounted display of claim 9 wherein an electrically driven actuator is included to provide automatic changes in focus distance.

12. The head mounted display of claim 11 wherein automatic changes in focus distance are provided to position a portion of the displayed image at an apparent distance that is associated with an augmented reality application.

13. The head mounted display of claim 1 wherein the emissive image source is an OLED display.

14. The head mounted display of claim 1 wherein the emissive image source is a backlit LCD display.

15. The head mounted display of claim 1 wherein the emissive image source is a micro-LED array display.

16. The head mounted display of claim 1 wherein the light trap captures stray light that is reflected back to the emissive image source.

17. The head mounted display of claim 1 wherein the light trap increase contrast in the displayed image seen by a user by capturing stray light in the upper optics.

18. The head mounted display of claim 1 wherein a central region of the display field of view is used to display an image with a lower format ratio than the display field of view and a portion of the display field of view outside of the displayed image is used to display additional information.

19. The head mounted display of claim 1 wherein the emissive image source provides a cone of image light that is 100 degrees or more included angle and the optics have an f# of 2.5 or faster.

20. The head mounted display of claim 1 wherein the emissive display is comprised of pixels and subpixels, and the emissive display and displayed field of view are selected so that each pixel subtends less than approximately 1/30 degree within the wide display field of view to make adjacent colored subpixels unresolvable by the human eye.

Assignments (8)