Projection display device

A projection display device, comprising:

• a light source;
• a reflective light bulb including a reflective surface, the reflective light bulb configured to modulate fight emitted from the light source, and to produce an image;
• a projection optical system configured to output the image along a specific optical path, and to project the image onto a specific projection face;
• an illumination optical system configured to guide light emitted from the light source to the reflective light bulb;
• a stationary aperture provided inside of the illumination optical system, the stationary aperture configured to block a first portion of the light emitted from the light source;
• a movable aperture provided inside of the illumination optical system, the movable aperture configured to block a second portion of the light emitted from the light source;
• an optical axis being a center axis of the light emitted from the light source;
• a plane perpendicular to the optical axis;
• wherein the reflective surface receives a portion of the light emitted from the light source and reflects it as planar reflected light;
• the stationary aperture is disposed such that it blocks the planar reflected light from entering the projection optical system;
• the stationary aperture includes an arc portion disposed on the plane;
• and the arc portion blocks a portion of the planar reflected light of the light emitted from the light source;
• a first portion of the planar reflected light having a first incidence angle;
• a second portion of the planar reflected light having a second incidence angle;
• the first incidence angle being smaller than the second incidence angle;
• and wherein the arc portion blocks the first portion of the planar reflected light.