Waveguided Display System With Adjustable Lenses

An optical system configured to convey image light from a display and external light to an eye box, the optical system comprising:

• a waveguide having opposing first and second surfaces;
• a first transparent layer mounted at the first surface;
• a first liquid crystal layer mounted to the first transparent layer;
• a second transparent layer mounted to the first liquid crystal layer, wherein the first and second transparent layers and the first liquid crystal layer are configured to pass the image light and the external light;
• a third transparent layer mounted at the second surface;
• a second liquid crystal layer mounted to the third transparent layer;
• and
• a fourth transparent layer mounted to the second liquid crystal layer,
• wherein the third and fourth transparent layers and the second liquid crystal layer are configured to pass the external light, wherein the first and third transparent layers have a first rubbing direction, and wherein the second and fourth transparent layers have a second rubbing direction antiparallel to the first rubbing direction.

A head-mounted device comprising:

• a display having an array of pixels;
• a waveguide configured to convey image light emitted by the display;
• a first liquid crystal lens mounted at a first side of the waveguide;
• a second liquid crystal lens mounted to the first liquid crystal lens;
• a third liquid crystal lens mounted at a second side of the waveguide;
• and
• a fourth liquid crystal lens mounted to the third liquid crystal lens, wherein the third and fourth liquid crystal lenses are configured to pass the image light and light from the first and second liquid crystal lenses, the first liquid crystal lens has first antiparallel rubbing directions, the second liquid crystal lens has second antiparallel rubbing directions orthogonal to the first antiparallel rubbing directions, the third liquid crystal lens has third antiparallel rubbing directions aligned with the first antiparallel rubbing directions and orthogonal to the second antiparallel rubbing directions, and the fourth liquid crystal lens has fourth antiparallel rubbing directions aligned with the second antiparallel rubbing directions and orthogonal to the first and third antiparallel rubbing directions.

A head-mounted device comprising:

• a waveguide having opposing first and second sides;
• a first liquid crystal layer at the first side of the waveguide;
• a first layer of first elongated electrodes on the first liquid crystal layer;
• a second liquid crystal layer at the second side of the waveguide;
• and
• a second layer of second elongated electrodes on the second liquid crystal layer, wherein the second elongated electrodes extend parallel to the first elongated electrodes, the first liquid crystal layer comprises first liquid crystal molecules having a first pretilt angle, and the second liquid crystal layer comprises second liquid crystal molecules having a second pretilt angle opposite to the first pretilt angle.