Patent ID: 8684542

Claim:
A projection display comprising: a light valve; a light source generating light applied to said light valve; an integrator lens provided on an optical path between said light source and said light valve and making uniform an illumination distribution of light applied from said light source to said light valve; and a light-amount control mechanism provided on said optical path and including a pair of light shielding bodies that turn like a double door in order to adjust the amount of light applied from said light source to said light valve, said light shielding bodies each having two cuts at their tips, wherein, for each light shielding body, said two cuts have different areas, respectively, and are formed in said light shielding bodies to have point symmetry with the corresponding two cuts in the other light shielding body with respect to a point on an optical axis when said light shielding bodies are closed, wherein, for each light shielding body, one of the two cuts is closer to the optical axis than the other, and the one of the two cuts closer to the optical axis has a larger area than the other, wherein, for each of the light shielding bodies, each of said two cuts is formed in the shape of a parabola or a semi-ellipse without forming an elliptical shape with either of the two cuts in the other light shielding body when the light shielding bodies are closed.