Electronic device with a tunable lens

A system, comprising:

• a head-mounted support structure;
• a display that emits light;
• a lens module supported by the head-mounted support structure that receives the light from the display, wherein the lens module comprises first and second fluid-filled chambers and first and second flexible membranes;
• and
• control circuitry configured to control the lens module to adjust curvature of the first flexible membrane and curvature of the second flexible membrane, wherein the control circuitry is configured to change a first amount of fluid in the first fluid-filled chamber and a second amount of fluid in the second fluid-filled chamber to adjust the curvature of the first flexible membrane and the curvature the second flexible membrane, wherein the first flexible membrane has surface relief that varies the elastic modulus of the first flexible membrane, and wherein the surface relief comprises a plurality of discrete grooves in the first flexible membrane that reduce stiffness in the first flexible membrane.

A system, comprising:

• a head-mounted support structure;
• a display that emits light;
• a lens module supported by the head-mounted support structure that receives the light from the display, wherein the lens module comprises:
• a first fluid-filled chamber defined by a first flexible membrane and a rigid divider;
• and
• a second fluid-filled chamber defined by a second flexible membrane and the rigid divider, wherein the rigid divider has first and second opposing surfaces, wherein the first surface directly contacts a first fluid in the first fluid-filled chamber, and wherein the second surface directly contacts a second fluid in the second fluid-filled chamber;
• and
• control circuitry configured to control the lens module to adjust curvature of the first flexible membrane and curvature of the second flexible membrane.

A system, comprising:

• a head-mounted support structure;
• a display that emits light;
• a lens module supported by the head-mounted support structure that receives the light from the display, wherein the lens module comprises:
• a first fluid-filled chamber defined by a first flexible membrane and a rigid lens element;
• and
• a second fluid-filled chamber defined by the first flexible membrane and a second flexible membrane, wherein the first flexible membrane has first and second opposing surfaces, wherein the first surface directly contacts a first fluid in the first fluid-filled chamber, and wherein the second surface directly contacts a second fluid in the second fluid-filled chamber;
• and
• control circuitry configured to control the lens module to adjust curvature of the first flexible membrane and curvature of the second flexible membrane.