Patent ID: 6419363
Filing Date: 2002-07-16
Classification: G03B

Abstract:
A time sequential dichroic light valve comprising:a first polarizing beam-splitting device for receiving a broadband incident light with a first polarized light and a second polarized light, and emitting a first and a second emitted polarized lights propagating in different optical paths, wherein the first emitted polarized light is the first polarized light of a first wave range which is produced when an energy field of negative polarity is applied to the first polarizing beam-splitting device, and the second emitted polarized light includes the first polarized light, except for that of the first wave range, and the second polarized light; a second polarizing beam-splitting device for receiving the second emitted polarized light from the first polarizing beam-splitting device, and emitting a third and a fourth emitted polarized lights propagating in different optical paths, wherein the third emitted polarized light is the first polarized light of a second wave range which is produced when an energy field of negative polarity is applied to the second polarizing beam-splitting device, and the fourth emitted polarized light includes the first polarized light, except for that of the first wave range and the second wave range, and the second polarized light; and a third polarizing beam-splitting device for receiving the fourth emitted polarized light from the second polarizing beam-splitting device, and emitting a fifth and a sixth emitted polarized lights propagating in different optical paths, wherein the fifth emitted polarized light is the first polarized light of a third wave range which is produced when an energy field of negative polarity is applied to the third polarizing beam-splitting device and the sixth emitted polarized light includes the second polarized light, whereby the energy field is sequentially applied to the first polarizing beam-splitting device, the second polarizing beam-splitting device and the third polarizing beam-splitting device to switch the transmission of the first polarized lights of the first wave range, the second wave range and the third wave range along a selective direction.