Korean researchers developed a transparent (84.5% transmittance) actuator that can be used to make movable elements for touch-screens and vari-focal lenses. The actuator is made from a dielectric elastomer layer sandwiched between two transparent and stretchable graphene electrodes (and a frame that links the materials to the substrate).

The researchers demonstrated how this actuator can be used in a tactile display. They also showed that the device can work even when stretched to 25% of its length.