Method for producing a hologram and a display device using the same

摘要

A method for producing a hologram recording an interference fringe formed by an object light and a reference light on a photosensitive dry plate, and the object light either having diffusing and scattering characteristics or being passed through an optical diffusion body, mainly includes the following steps: In a first step, a ratio eta R0/ eta 00 of a first diffraction efficiency eta 00 and a second diffraction efficiency eta R0, is calculated. The diffraction efficiency eta 00 is dependent on two object light beams. The efficiency eta R0 is dependent on the object light and the reference light. In a second step, the intensity EO of the object light and the intensity ER of the reference light is adjusted in such a way that the ratio eta R0/ eta 00 is set to at least 10 and the efficiency eta 00 does not exceed 5%. A display device using the above hologram is structured by a display unit for generating a signal light; a hologram screen formed by either reflection or transmission hologram, and a projecting unit for projecting the signal light to the hologram screen. According to the present invention, it is possible to easily produce a hologram, for example, a screen hologram, having no cloudiness or cloudy state when an observer observes an image displayed on the screen, and to a display device using the above hologram screen.