SINGLE REFLECTIVE LIGHT VALVE PROJECTION DEVICE
A single reflective light valve projection device comprising a non-telecentric lighting system, a projection lens and a reflective light valve is provided. The non-telecentric lighting system comprises a light source and a lens. The light source provides a light beam. The lens is disposed in the transmission path of the light beam. The projection lens is disposed behind the lens and in the transmission path of the light beam. The reflective light valve is disposed between the lens of the non-telecentric lighting system and the projection lens and in the transmission path of the light beam. The reflective light valve comprises many horizontally aligned rows of pixels. A line joining the center of the projection lens to the center of the lens forms an angle smaller than π/4 with respect to a horizontal line to provide side projection in the horizontal direction.
1 . A single reflective light valve projection device for providing side projection along a horizontal line, the device comprising:
a non-telecentric illumination system, comprising:
a light source for providing a light beam;
a lens disposed in the transmission path of the light beam;
a projection lens disposed behind the lens and in the transmission path of the light beam; and
a reflective light valve disposed between the lens and the projection lens and in the transmission path of the light beam, wherein the reflective light valve has rows of pixels along the horizontal line and a line joining the center of the projection lens and the center of the lens forms an angle smaller than π/4 with respect to the horizontal line to perform side projection along the horizontal line.
2 . The projection device of claim 1 , wherein the reflective light valve comprises a digital micro-mirror device (DMD) or a liquid crystal on silicon (LCOS) panel.
3 . The projection device of claim 1 , wherein the lens comprises a transparent lens with a curved surface.
4 . The projection device of claim 1 , wherein the lens comprises a reflecting mirror with a plane surface.
5 . The projection device of claim 1 , wherein the lens comprises a reflecting mirror with a curved surface.
6 . The projection device of claim 1 , wherein the light beam converges at a point about 10 mm to 100 mm in front of the reflective light valve.
7 . The projection device of claim 1 , wherein the horizontal offset in the side projection exceeds 100%.
8 . A single reflective light valve projection device for providing a side projection along a horizontal line and/or a vertical line, the device comprising:
a non-telecentric illumination system, comprising:
a light source for providing a light beam;
a lens disposed in the transmission path of the light beam;
a projection lens disposed behind the lens and in the transmission path of the light beam; and
a reflective light valve disposed between the lens and the projection lens and in the transmission path of the light beam, wherein the reflective light valve has rows of pixels along the horizontal line and the projection lens moves along the horizontal line in a direction away from the lens to perform side projection having different degrees of horizontal offset.
9 . The projection device of claim 8 , wherein the reflective light valve comprises a digital micro-mirror device (DMD) or a liquid crystal on silicon (LCOS) panel.
10 . The projection device of claim 8 , wherein the lens comprises a transparent lens with a curved surface.
11 . The projection device of claim 8 , wherein the lens comprises a reflecting mirror with a plane surface.
12 . The projection device of claim 8 , wherein the lens comprises a reflecting mirror with a curved surface.
13 . The projection device of claim 8 , wherein the light beam converges at a point about 10 mm to 100 mm in front of the reflective light valve.
14 . The projection device of claim 8 , wherein the projection lens moves along the vertical line to perform side projection having different horizontal offset and vertical offset simultaneously.