DISPLAY DEVICE HAVING MAGNIFYING FUNCTION

摘要

PROBLEM TO BE SOLVED: To cancel a problem caused by the occurrence of moire interference fringes when a linear Fresnel lens is fitted to a display screen, and an image is magnified and observed. SOLUTION: In a display device consisting of a display screen having many pixels arranged at a regular pitch along a longitudinal directional axis, a lateral directional axis and an oblique directional axis tilted at a tilt angleθto the longitudinal axis, and a linear type Fresnel lens having a longitudinal directional Fresnel lens element linearly formed along the longitudinal directional axis and a lateral directional Fresnel lens element linearly formed along the lateral directional axis and fitted to the display screen, the Fresnel lens is fitted so that its longitudinal directional axis is tilted by an angle (α) shown byα=(θ/2)±(θ/4) orα=(3θ/2)±(θ/4) to the longitudinal directional axis of the display screen.