Projection type display apparatus

Abstract

[Task] It is to provide a projection type display apparatus which enhances the contrast performance while minimizing a reduction in the brightness by blocking a light beam which would decrease the contrast through the use of diaphragms provided in both of an illumination optical system and a projection lens. [Solution] A light source portionand, a first lens array, a second lens array, and a superposition lensconstitute an illumination optical system. An illumination diaphragmlocated in the vicinityof the second lens array becomes a diaphragm aperture in a rectangular shape when being narrowed, wherein a side of the diaphragm aperture in the rectangular shape and longer side directions of the lens cells of the second lens arrayare perpendicular or parallel to each other. A liquid crystal display devicemodulates incident light. A projection lensenlarges and projects modulation light. A projection lens diaphragmbecomes a diaphragm aperture in a rhombus shape when being narrowed, wherein a diagonal line of the diaphragm aperture in the rhombus shape and directions of sides of lens cells in a pupil image of the second lens arraywhich is formed in a pupil position of the projection lens are perpendicular or parallel to each other.