| 摘要 |
A projection display device having an image projection device adapted to project an image on a surface, and a position detection function of optically detecting a position of an object matter located between the surface and the image projection device, includes: a position detection light source section disposed in the image projection device, and adapted to emit position detection light beams toward the object matter; a light detector adapted to detect the position detection light beams reflected by the object matter; and a position detection section adapted to detect the position of the object matter in an imaginary plane intersecting emission directions of the position detection light beams based on a light reception result of the light detector, wherein the position detection light source section emits, as the position detection light beams, a first position detection light beam having a first intensity distribution, a second position detection light beam having a second intensity distribution having a highest intensity portion at a position failing to overlap a highest intensity portion of the first intensity distribution viewed from the image projection device, and a third position detection light beam having a third intensity distribution having a highest intensity portion at a position failing to overlap an imaginary straight line connecting the highest intensity portion of the first intensity distribution and the highest intensity portion of the second intensity distribution viewed from the image projection device.
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