Patent ID: 6987616
Filing Date: 2006-01-17
Classification: G02B,H04N

Abstract:
1. A light reflection and diffraction element for reflecting and/or diffracting incident light, said light reflection and diffraction element having a common electrode substrate, a first group of a plurality of reflective members located facing the common electrode substrate and having light reflection characteristics, and a second group of a plurality of reflective members located facing said common electrode substrate and having light reflection characteristics, wherein adjacent reflective members of said first group of a plurality of reflective members and adjacent reflective members of said second group of a plurality of reflective members are formed separated by a first cycle (pitch); corresponding members of said first group of a plurality of reflective members and said second group of a plurality of reflective members are located in a plane adjacent to each other in an inter digital form by a second cycle (pitch); a reflection plane of said first group of reflective members and a reflection plane of said second group of the reflective members become substantially the same reflection plane in a first state, while a reflection plane of said first group of reflective members and a reflection plane of said second group of reflective members are separated by exactly a distance for diffracting the incident light in a relationship between said first cycle and said second cycle in a second state; and said element has an unrequired diffracted light generation preventing means for preventing, when the incident light is incident, unrequired diffracted light from being generated from a portion other than an effective region wherein corresponding members of said first group of a plurality of reflective members and said second group of a plurality of reflective members are located adjacent to each other; wherein the reflection surfaces of said first group of reflective members and said second group of reflective members are formed with uneven surfaces having correlation lengths shorter than said predetermined cyclic structure.