| 摘要 |
A projection display apparatus has: a TIR prism having a first prism surface, a second prism surface, and a third prism surface; a projection lens which is disposed opposite to the first prism surface; and an image display device which is disposed opposite to the second prism surface. The image display device reflects incident light in a first direction or in a second direction in accordance with an image signal. The first, second, and third prism surfaces are formed so as to define a modulated light path, wherein the light is reflected in the first direction, then is incident on the second prism surface, then is totally reflected internally on the third prism surface, then exits from the first prism surface, and then is incident on the projection lens along the modulated light path. The first prism surface includes a first effective light beam area and a first shield area for shielding the light, wherein the modulated light path passes through the first effective light beam area, and wherein the first shield area is formed on at least a part of the first prism surface except for the first effective light beam area.
|
