▎ 摘　　要

NOVELTY - The lens has a transparent electrode layer containing graphene formed on a part of each of sides of a transparent dielectric elastomer layer. Visible light transmittance of the transparent electrode layer is about 50% or greater than 50%. The transparent dielectric elastomer layer is selected from a group consisting of silicone, polyurethane, polydimethylsiloxane (PDMS) and acryl. Thickness of the transparent dielectric elastomer layer is about 1 cm or less than 1 cm. Thickness of the transparent electrode layer is about 50 nm or less than 50 nm. USE - Variable focus lens for a display device (claimed), in an electronic device. Uses include but are not limited to a notebook computer, a monitor, a TV and a mobile device. ADVANTAGE - The lens applies voltage to transparent electrodes formed on the sides of the variable focus lens to generate potential difference between the respective transparent electrodes so as to vary shape of the transparent dielectric elastomer layer included in the variable focus lens according to driving principle, thus controlling focus of the variable focus lens. The lens can be prepared without the need of parts such as motor and support, and can be synthesized in micro size by using photolithography or electron beam lithography, so that the variable focus lens has better mechanical property, thus minimizing damage to the electrodes caused by movement of dielectric and improving reliability of the lens. The graphene contained in the variable focus lens can be patterned, and is transparent, so that the electrodes can be synthesized with desired shape and/or size, and a single layer of graphene drives the variable focus lens, thus achieving high light transmittance of the lens. The graphene has excellent Young's modulus and high mechanical strength, so that change of characteristics of the transparent electrodes can be effectively avoided even if shape of the lens is changed. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a variable focus lens preparing method (2) a method for controlling focus of a variable focus lens. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a variable focus lens in a driving state.