PICTURE DISPLAY DEVICE, DIFFRACTIVE OPTICAL ELEMENT, HOLOGRAPHIC ELEMENT, AND MANUFACTURING METHOD OF HOLOGRAPHIC ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a picture display device which exerts a function to the maximum extent for effectively increasing a numerical aperture of a micro lens array formed on a picture display element, and has a high projection efficiency and a bright display. SOLUTION: An image is formed by interfering an object beam with a reference beam, and the object beam is an approximately parallel object luminous flux, and the reference beam uses holographic elements 216-218, which are lighting reference optical system having a wavefront almost equivalent to the luminous flux outputted from a lighting optical part 104 condensing and propagating a 1st luminous flux emitted from a lamp 102, and thus, the image display device is constituted so as to display an image by transforming the above output luminous flux into approximately parallel light, making the light incident on the image display elements 219-221, and modulating it.