Patent ID: 8269919
Filing Date: 2012-09-18
Classification: G02B,G02F

Abstract:
1. A display device comprising: (a) an optical element comprising: a transparent substrate, a concavoconvex shape portion formed on at least one surface of the transparent substrate and in a prescribed pattern for diffracting incident light to form an image, wherein said concavoconvex shape portion is a transmissive-type diffraction grating that generates a diffraction image, and a light controlling layer including at least one transparent portion and at least one light-absorption portion arranged alternately on said at least one surface of the transparent substrate, each of said at least one transparent portion and said at least one light-absorption portion extending in a direction that intersects said at least one surface; and (b) an optical control element for forming a display image, wherein the optical element is arranged on a display surface side of the optical control element such that a surface of the optical element, which is on a side opposite to a side of the transparent substrate on which the concavoconvex shape portion is formed, faces the optical control element, wherein said at least one transparent portion and said at least one light-absorption portion are constituted to display the display image in a first angle region located in a front direction with regard to a display surface of the optical element, wherein the display image has a higher amount of light than an image formed by the concavoconvex shape portion, and wherein the concavoconvex shape portion is constituted to display the image in a second angle region located in an oblique direction with regard to the display surface of the optical element, wherein the image has a higher amount of light than the display image.