Magneto-optic chip with gray-scale capability

Claim 1

A magneto-optic display system to achieve gray-scale comprising: (a) first and second generally planar magneto-optic chips; each of said magneto-optic chips includes: (1) a registration surface normal to the direction of light passage through said chip, (2) a plurality of pixel areas in which individual ones of said pixel areas can exhibit one state of at least three magnetic states: a first state magnetized totally in one direction where said one direction is normal to said registration surface and parallel with said direction of light passage, a second state magnetized totally in an opposite direction to said one direction, and a third state magnetized both in said one direction and in said opposite direction so that said third state is demagnetized or stripped out, and (3) means to electrically address individual ones of said pixel areas and place a selected pixel area in a respective one of said three magnetic states; (b) said first and second magneto-optic chips positioned adjacent to each other in a tandem relationship with respective ones of said first chip pixel areas in alignment with associated ones of said second chip pixel areas so that the associated amount of light passage through said selected pixel area as determined by its magnetic state has one of three corresponding levels of light passage thereby developing a desired degree of gray scale.