Patent ID: 8988649
Filing Date: 2015-03-24
Classification: G02B,G02F,H04N

Abstract:
1. An image display device, comprising: a display panel to display an image; and a diffractive lens disposed on the display panel to modify a light path of the image to be recognized as a two-dimensional (2D) image or a three-dimensional (3D) image, wherein the diffractive lens modifies the light path by operating as a Fresnel zone plate, wherein the diffractive lens comprises: wherein the first electrode layer comprises: wherein the diffractive lens comprises a plurality of zones sequentially positioned toward an outside with reference to a center of the Fresnel zone plate diffractive lens, the plurality of zones comprising a first zone and a second zone that are adjacent to each other and disposed at a same side with respect to the center of the diffractive lens, wherein each zone comprises at least one of the first electrodes and at least one of the second electrodes, each zone comprising a plurality of sub-zones, and wherein, in a 3D mode to recognize the 3D image, the diffractive lens is turned on and the first and second electrodes are supplied with voltages that are gradually varied toward the center of the diffractive lens in each of the first zone and the second zone, and a voltage applied to the first or second electrode in a first sub-zone of the first zone is substantially the same as a voltage applied to the first or second electrode in a first sub-zone of the second zone.