Patent ID: 9083894
Filing Date: 2015-07-14
Classification: G02B,G03B,H04N

Abstract:
1. A projection type display apparatus comprising: a light source portion; a first lens array in which a plurality of lens cells are two-dimensionally arranged; a second lens array having a plurality of lens cells corresponding to the first lens array; a superposition lens adapted to superimpose an image of the first lens array on a display surface of a liquid crystal display device, which is adapted to modulate incident light from the superposition lens; an illumination diaphragm located in the vicinity of the second lens array and adapted to form a diaphragm aperture in a rectangular shape when the plurality of the cells in the second lens array are shaded in a linear or straight direction, wherein a side of the diaphragm aperture in the rectangular shape is in the direction of diffracted light of the liquid crystal display device and is perpendicular or parallel to longer side directions of the lens cells of the second lens array; a projection lens adapted to enlarge and project modulation light emitted from the liquid crystal display device; and a projection lens diaphragm provided in the vicinity of a pupil of the projection lens and adapted to form 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 array which is formed in a pupil position of the projection lens are perpendicular or parallel to each other.