Patent ID: 9158123
Filing Date: 2015-10-13
Classification: B29D,G02B,G02F

Abstract:
1. A light diffraction element comprising: a transparent substrate; a first orientation layer that is formed on one surface of the substrate and includes anisotropic polymers and a first pattern of an orientation direction arranged periodically in a first direction along the primary plane of the substrate; a first liquid crystal layer that is provided on the first orientation layer and includes liquid crystal oriented periodically in the orientation direction of the first orientation layer; a second orientation layer that is formed on a top surface of the first liquid crystal layer and includes anisotropic polymers and a second pattern of an orientation direction arranged periodically in a second direction along the primary plane of the substrate; and a second liquid crystal layer that is provided on the second orientation layer and includes liquid crystal periodically oriented in the orientation direction of the second orientation layer, wherein the first pattern includes three or more small regions that are arranged in the first direction and in which the orientation direction of the polymers included in the first orientation layer are different from each other, and generates diffracted light as a result of interference between light passed respectively through the three or more small regions, the total of retardation of the first orientation layer and retardation of the first liquid crystal layer is a ¼ wavelength, and the total of retardation of the second orientation layer and retardation of the second liquid crystal layer is a ½ wavelength.