Projection type image display device maintaining resolution of an image unaffected by parallax

摘要

An image display device is arranged to have a liquid crystal light valve, a liquid crystal display panel, a backlighting unit, and a rod lens array. The liquid crystal light valve serves to form an image from the light applied thereto. The liquid crystal display panel serves to form a light pattern to be written to the liquid crystal light valve. The backlighting unit serves to apply light to the panel. The rod lens array is located between the liquid crystal panel and the liquid crystal light valve so that each of the light acceptance angle theta (half angle) and the degree of parallelization alpha (half angle) of light are not less than tan-1{P/(31/2xL)} (P is a pitch and L is a distance between the incident end of light and the pixel of the matrix type liquid crystal display panel) and at least one of the light acceptance angle theta (half angle) and the degree of parallelization a of light is 20 DEG or less.