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1. (WO2017112084) DYNAMIC FOCUSING HEAD MOUNTED DISPLAY
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CLAIMS

1. A head-mounted display apparatus comprising:

a display;

a beam splitter, in optical communication with the display, to transmit light emitted by the display;

a concave reflective surface, in optical communication with the beam splitter, to receive the light emitted by the display and transmitted by the beam splitter and to reflect an image of the display to a wearer of the head-mounted display apparatus via the beam splitter; and

a tunable lens, disposed between the beam splitter and the concave reflective surface and having a variable optical power, to vary a focus of the image of the display reflected to the wearer.

2. The head-mounted display apparatus of claim 1, wherein the display is configured to emit light polarized along an axis perpendicular to an optical axis of the tunable lens.

3. The head-mounted display apparatus of claim 2, wherein the tunable lens comprises a layer of nematic liquid crystal material disposed between the beam splitter and the concave reflective surface.

4. The head-mounted display apparatus of claim 2, wherein the tunable lens comprises a layer of bi-stable liquid crystal material disposed between the beam splitter and the concave reflective surface.

5. The head-mounted display apparatus of claim 1, wherein the beam splitter is configured to transmit ambient light to the wearer.

6. The head-mounted display apparatus of claim 1, wherein:

the beam splitter defines a convex surface, and

the tunable lens comprises electro-active material disposed between the convex surface and the concave reflective surface.

7. The head-mounted display apparatus of claim 6, wherein the concave reflective surface forms at least a portion of a ground plane in electrical communication with the electro-active material.

8. The head-mounted display apparatus of claim 6, further comprising: a plurality of electrodes, disposed between the electro-active material and the convex surface, to apply a voltage gradient to the electro-active material so as to vary a refractive index of the electro-active material.

9. The head-mounted display apparatus of claim 1, wherein the tunable lens comprises a liquid lens having a deformable curved membrane disposed in optical communication with the beam splitter.

10. The head-mounted display apparatus of claim 9, wherein the flexible membrane defines the concave reflective surface.

11. The head-mounted display apparatus of claim 1, further comprising:

a controller, operably coupled to the tunable lens, to actuate the tunable lens in response to an input from the wearer.

12. The head-mounted display apparatus of claim 1, further comprising:

a controller, operably coupled to the tunable lens and the display, to actuate the tunable lens in response to an image on the display.

13. A method of displaying information on a head-mounted display apparatus, the method comprising:

displaying an information-bearing image to a wearer of the head-mounted display apparatus, via the head-mounted display apparatus, at a focus selected to match

accommodation of the wearer.

14. The method of claim 13, wherein displaying the information-bearing comprises: generating the information-bearing image at a display of the head-mounted display apparatus;

transmitting the information-bearing image through a tunable lens disposed between a beam splitter and a concave reflective surface; and

reflecting the information-bearing image to the wearer via the concave reflective surface and the beam splitter.

15. The method of claim 13, further comprising:

actuating the tunable lens so as to change the focus of the information-bearing image.

16. The method of claim 15, wherein actuating the tunable lens comprises actuating the electro-active material in response to a command from the wearer.

17. The method of claim 15, wherein actuating the tunable lens comprises actuating the tunable lens in response to information in the information-bearing image.

18. The method of claim 15, wherein actuating the tunable lens comprises varying a voltage applied to a liquid crystal material.

19. The method of claim 15, wherein actuating the tunable lens comprises pumping fluid between a liquid lens and a fluid reservoir.

20. A head-mounted display apparatus comprising:

a display to emit polarized light;

a beam splitter, in optical communication with the display, to transmit a portion of the polarized light emitted by the display, the beam splitter defining a convex surface;

a concave reflective surface, in optical communication with the beam splitter, to receive the portion of the polarized light transmitted by the beam splitter and to reflect an image of the display to a wearer of the head-mounted display apparatus via the beam splitter; a liquid crystal layer, disposed between the convex surface and the concave reflective surface, to vary a focus of the image of the display reflected to the wearer.

21. A head-mounted display apparatus comprising:

a display;

a beam splitter, in optical communication with the display, to transmit light emitted by the display;

a liquid lens, in optical communication with the beam splitter, to provide a variable optical power; and

a mirror, in optical communication with the liquid lens and the beam splitter, to receive the light emitted by the display and transmitted by the beam splitter via the liquid lens and to reflect an image of the display to a wearer of the head-mounted display apparatus via the liquid lens.