Patent ID: 8223421

Claim:
A shutter comprising: a first insulating substrate having a first surface; a first electrode layer positioned on the first surface, the first electrode layer comprising a plurality of layer portions insulated from one another; a second insulating substrate having a second surface oriented toward the first surface; a second electrode layer positioned on the second surface; and a light-blocking layer positioned between the first electrode layer and the second electrode layer, the light-blocking layer comprising a light-pervious liquid, and a plurality of opaque and charged balls movably distributed in the liquid, at least one layer portion of the first electrode layer being selected, the at least one selected layer portion and the second electrode layer being connected to respective positive voltage and negative voltage, such that the at least one selected layer portion and the second electrode layer cooperatively apply an electric field to the charged balls and attract the charged balls to arrange in a configuration corresponding to the at least one selected layer portion, thus blocking light therethrough.