Browse Prior Art Database

Original Publication Date: 1977-Apr-30
Included in the Prior Art Database: 2004-Mar-29

Publishing Venue

Xerox Disclosure Journal


In electro-optic cells employing liquid crystalline layers, the uniformity of observed electro-optic effect depends upon the uniformity of coplanarity of the electroded surfaces or cavity in the cell. A novel technique for insuring uniform cavity spacing is pro-posed. It is proposed to use piezoelectric rods as spacers between electroded surfaces and to adjust the effective length of each rod by application of electrical bias to each rod. By adjusting the bias applied to each rod, the effective length of each rod can be adjusted to accurately control coplanarity of the electroded surfaces and therefore achieve very precise and uniform spacing between the electroded surfaces. Thus, the liquid crystalline layer occupying this uniform spacing is uniform in thickness and the observed electro-optic effects appear to be uniform over the entire surface area of the liquid crystalline layer.