Jonathan Colclough Ruth

US Patent:

62784293, Aug 21, 2001

Filed:

Sep 11, 1998

Appl. No.:

9/151420

Inventors:

Jonathan C. Ruth - Kent OH
Richard Hewitt - Beaverton OR
Philip J. Bos - Hudson OH

Assignee:

Kent State University - Kent OH

International Classification:

G09G 336

US Classification:

345 94

Abstract:

A driving circuit for a reflective bistable cholesteric liquid crystal display which includes one substrate having a plurality of column or segment electrodes opposed by another substrate having a plurality of row or common electrodes. The intersecting column and row electrodes with the cholesteric material therebetween form a plurality of pixels. The driving circuit selectively applies a voltage to the row and column electrodes to control the appearance of the cholesteric material. In particular, the driving circuit includes at least one common driver coupled to respective common electrodes with each common driver having a first and a second common frame switch with corresponding high or low inputs. The first and second common frame switches are linked to one another by a common frame line. The high and low common inputs are connected to a plurality of common data switches, the first common frame switch a first and a second common voltage input and the second column frame switch having a third and a fourth common voltage input connected to each other.