Granted Patent B2

US 9,684,171 · App. 14/834,795 · Granted Jun 20, 2017

Abstract

Claims (21)

1. A head mounted display providing a wide display field of view and a high transmission see-through view of the surrounding environment with improved visual uniformity of a displayed image to a user comprising:

a. upper optics with a first optical axis including:

i. an emissive image source that provides image light;

ii. one or more lenses; and

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

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

ii. a curved partially reflective mirror; and

wherein at least one of the partially reflective surfaces includes a notch mirror treatment.

2. The head mounted display of claim 1 wherein the upper optics provide telecentric light to the lower optics to improve uniformity in the displayed image by reducing the angular extent of a light associated with the displayed image incident onto a surface that includes a notch mirror treatment.

3. The head mounted display of claim 1 wherein the displayed image is digitally modified to radially increase the digital brightness in the displayed image to compensate for radial brightness rolloff from the notch mirror treatment.

4. The head mounted display of claim 1 wherein the displayed image is digitally modified to radially increase the color rendering in the displayed image to compensate for angularly based color changes from the notch mirror treatment.

5. The head mounted display of claim 1 wherein the notch mirror treatment reflects narrow bands of red, green and blue light.

6. The head mounted display of claim 5 wherein the narrow bands of red, green and blue light are matched to the bands of colored light output by the emissive display.

7. The head mounted display of claim 1 wherein the notch mirror treatment has a higher reflectivity for an S polarized incident light.

8. the head mounted display of claim 1 wherein the notch mirror treatment has a reflectivity that is insensitive to the polarization of an incident light.

9. The head mounted display of claim 1 further comprising multiple optical elements and wherein the distance between adjacent optical elements can be adjusted to change the focus distance of the displayed image.

10. The head mounted display of claim 9 wherein a sensor is provided to measure the distance between the adjacent optical elements as the focus distance is adjusted.

11. The head mounted display of claim 10 wherein the displayed image is digitally modified before being displayed to compensate for changes in size of the displayed image associated with the change in focus distance.

12. The head mounted display of claim 1 wherein the notch mirror treatment is a coating.

13. The head mounted display of claim 1 wherein the notch mirror treatment is a film.

14. The head mounted display of claim 1 wherein the notch mirror treatment is a phase matched nano-structure.

Assignments (8)