Patent ID: 7116387

Claim:
A display device comprising: a spatial light modulator, wherein the spatial light modulator is an LCD panel; a first microretarder and a second microretarder superposed with the first microretarder and placed behind the spatial light modulator, wherein each of the two microretarders has multiple vertical stripes, a portion of the vertical stripes of one of the microretarders has a phase retardation π and a portion of the vertical stripes of the other microretarder has a phase retardation −π, wherein other portions of the vertical stripes of the two microretarders have a phase retardation of 0; a polarizer placed behind the two microretarders; a back light placed behind the polarizer; a first driving device connected to the first microretarder to move the first microretarder and a second driving device connected to a combination of the first microretarder and the first driving device to move the combination; and a carrier, wherein relative horizontal movement of the two microretarders results in the display device to alternatively display a 2D image and a 3D image.