Patent ID: 8573787

Claim:
A projection type display apparatus, comprising: a light source for emitting a light; a first reflection portion, which is configured to reflect the light from said light source; an image display element, which is configured to modulate the light from said first reflection portion; a lens group, which is made up with a plural number of lens elements, transmitting the light from said image display element; and a second reflection portion, which is configured to reflect the light from said lens group thereupon, wherein an optical axis of said light source is nearly perpendicular to an optical axis of said lens group, said second reflection portion is so disposed that it inclines to an optical axis of said lens group at a predetermined angle, said light source is disposed so as to bring an optical axis of the light source to be nearly horizontal, even if the projection type display apparatus is disposed in either a nearly vertical disposition or a nearly horizontal disposition to extend the light source life time, wherein the optical axis of the light source and an input optical axis into the second reflection portion intersect perpendicular with each other; wherein said lens group are placed in between said first and said second reflection portions, wherein said projection type display apparatus configured to have a first mode of being disposed vertically, and a second mode of being disposed horizontally, and in said first mode, the optical axis of said light source is nearly in parallel with a surface, on which said projection type display apparatus is disposed, and the optical axis of said lens group are nearly perpendicular to the surface, and in said second mode, the optical axis of said light source and the optical axis of said lens group are nearly in parallel with the surface.