Projection display device and electrooptical device

A projection display device, comprising:

• an electrooptical device;
• a light-source unit that emits a first light-source light beam to the electrooptical device in a first irradiation direction and emits a second light-source light beam to the electrooptical device in a second irradiation direction different from the first irradiation direction;
• and
• an optical projection system that projects a first modulated light beam, into which the first light-source light beam is modulated by the electrooptical device, and a second modulated light beam, into which the second light-source light beam is modulated by the electrooptical device,
• wherein the electrooptical device includes
• a first mirror that modulates light,
• a first driving element that swings the first mirror to switch a position of the first mirror,
• a second mirror that is disposed so that a surface of the second mirror faces in a direction the same as a direction in which a surface of the first mirror faces and that modulates light, and
• a second driving element that swings the second mirror to switch a position of the second mirror,
• wherein the first driving element switches the position of the first mirror between a first turn-on position, in which the first mirror reflects the first light-source light beam in an ON-direction toward the optical projection system, and a first turn-off position, in which the first mirror reflects the first light-source light beam in a first OFF-direction, the first OFF-direction being different from the ON-direction, the first irradiation direction, and the second irradiation direction, and
• wherein the second driving element swings the second mirror in a direction different from the direction in which the first mirror is caused to swing to switch the position of the second mirror between a second turn-on position, in which the second mirror reflects the second light-source light beam in the ON-direction, and a second turn-off position, in which the second mirror reflects the second light-source light beam in a second OFF-direction, the second OFF-direction being different from the ON-direction, the first irradiation direction, and the second irradiation direction.