Electronic device with liquid lens

Abstract

A head-mounted device can have lenses. A user can view images from an eyebox through the lenses. The lenses can be tunable liquid lenses. Each lens can have a lens chamber. The lens chamber of the lens can have rigid and / or flexible walls that form an optical lens surface. An actuator and / or a pump and reservoir system can deform the lens surface in response to control signals from control circuitry to tune the lens. Each liquid lens can have oil or other liquid in the lens chamber for the lens. The refractive index of the lens can be adjusted using inorganic dielectric particles or other refractive index adjusting particles. The size of the particles can be subwavelength.

Claims

1. A head-mounted device, comprising: Headband support structure; Control circuit; as well as A tunable liquid lens, configured to be adjusted by the control circuit, wherein the tunable liquid lens comprises: A lens chamber having a lens chamber wall forming an optical lens surface, wherein the lens chamber wall includes a flexible lens film and a sidewall structure, and wherein the sidewall structure includes an upper sidewall portion connected to the flexible lens film and a lower sidewall portion configured to engage with the upper sidewall portion; The liquid located in the lens chamber; and A refractive index adjusting particle located in the liquid, the refractive index adjusting particle being configured to change the refractive index of the liquid, wherein the control circuit is configured to adjust the tunable liquid lens based on the relative movement of the height of the sidewall structure between the upper sidewall portion and the lower sidewall portion.

2. The head-mounted device according to claim 1, wherein the tunable liquid lens further comprises an actuator circuit controlled by the control circuit to adjust the lens chamber wall shape of at least one lens chamber wall in the lens chamber wall to tune the tunable liquid lens.

3. The head-mounted device of claim 1, wherein the tunable liquid lens further comprises a liquid pump and reservoir system connected to the lens chamber.

4. The head-mounted device according to claim 1, wherein the flexible lens film comprises silicone resin.

5. The head-mounted device according to claim 1, wherein the lens chamber wall includes a rigid dome opposite to the flexible lens film.

6. The head-mounted device of claim 1, wherein the refractive index adjusting particles comprise inorganic particles, and wherein the refractive index adjusting particles comprise particles selected from the group consisting of: titanium oxide, niobium oxide, tantalum oxide, zirconium oxide, magnesium oxide, and silicon nitride.

7. The head-mounted device according to claim 1, wherein the refractive index adjusting particles have an average diameter of less than 100 nm.

8. The head-mounted device of claim 1, wherein the refractive index adjusting particles have an average diameter of 3 nm to 20 nm, and wherein at least 70% of the refractive index adjusting particles have a size within + / - 50% of the average size.

9. The head-mounted device of claim 1, wherein the liquid comprises oil.

10. The head-mounted device according to claim 1, wherein the liquid has a viscosity of 0.1 mPas to 50 mPas.

11. The head-mounted device of claim 1, wherein the liquid comprises a liquid selected from the group consisting of phenylmethylsiloxane, polyalkylated cyclopentane, polyphenylene ether, and silicone oil, and wherein at least one lens chamber wall comprises a material selected from the group consisting of epoxy resin, polycarbonate, polymethyl methacrylate, polydimethylsiloxane, and cycloolefin polymer.

12. The head-mounted device of claim 1, wherein the tunable liquid lens comprises an achromatic doublet lens.

13. The head-mounted device of claim 1, wherein the tunable liquid lens has a refractive index of 1.6 to 1.

8.

14. The head-mounted device of claim 1, wherein the tunable liquid lens has a refractive index of 1.65 to 1.

75.

15. The head-mounted device according to claim 1, wherein the refractive index adjusting particles have a weight fraction of 40%-95% in the liquid.

16. The head-mounted device of claim 1, further comprising a display configured to display an image viewable from the eyebox through the tunable liquid lens.

17. A tunable liquid lens, comprising: A lens chamber having a lens chamber wall, wherein the lens chamber wall includes a flexible lens film and a sidewall structure, wherein the sidewall structure includes an upper sidewall portion connected to the flexible lens film and a lower sidewall portion configured to engage with the upper sidewall portion, and wherein the upper sidewall portion and the lower sidewall portion are configured to move relative to each other to adjust the height of the sidewall structure. The liquid located in the lens chamber; as well as The liquid contains inorganic dielectric particles with an average diameter of less than 50 nm.

18. The tunable liquid lens of claim 17, wherein the inorganic dielectric particles constitute 40%-95% by weight in the liquid and wherein the tunable liquid lens has a diameter of 2cm-15cm.

19. A head-mounted device, comprising: Headband support structure; A display, which is coupled to the head-mounted support structure and configured to generate an image; as well as A tunable liquid lens through which the image is visible from the eyebox, wherein the tunable liquid lens comprises: A lens chamber having a flexible membrane, a wall opposite to the flexible membrane, and a sidewall, wherein the sidewall includes an upper sidewall portion connected to the flexible membrane and a lower sidewall portion connected to the wall and cooperating with the upper sidewall portion; The liquid located in the lens chamber; and Refractive index adjusting particles located in the liquid, the refractive index adjusting particles being configured to change the refractive index of the liquid, wherein the upper sidewall portion is configured to slide relative to the lower sidewall portion to adjust the flexible membrane between a convex position and a concave position.

20. The head-mounted device of claim 19, wherein the refractive index adjusting particles have an average diameter of 3 nm to 20 nm.

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