| 摘要 |
To suppress the reduction of contrast caused by reduction of contrast in the case where a projection type display apparatus for displaying an image is used in a dark place. In a projection type display apparatus for displaying an image which includes a liquid crystal display element unit that modulates and emits incident light, an illumination optical system that allows emission light emitting from a light source to enter the liquid crystal display element unit, and a projection optical system that projects the emission light emitting from the liquid crystal display element unit to a screen, an optical unit includes an iris unit in which light shielding plates shut the amount of light entering the liquid crystal display element unit to be narrowed down as the brightness level of image light projected from the projection optical system is lower, and an open/close angle of each light shielding plate is set at smaller than 90 degrees.
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