Browse Prior Art Database

Liquid Crystal Display With Built in Refresh

IP.com Disclosure Number: IPCOM000056313D
Original Publication Date: 1980-Nov-01
Included in the Prior Art Database: 2005-Feb-14

Publishing Venue

IBM

Related People

Authors:
Larsen, TA Martin, DH [+details]

Abstract

The need for a refresh buffer in a liquid crystal display is eliminated by providing means which periodically sense the states of the liquid crystal display elements, compare the sensed state with that of a dummy cell, and in accordance with the result of the comparison regenerate the display elements. The display device has the usual form of row/column addressing and for sensing is addressed row by row, the state of * different elements of the row being addressed appearing on different column lines. Figs. 1 and 2 show liquid crystal cells to which this article is applicable Associated with each liquid crystal cell L is a capacitor C, the state of charge of which determines the state of the cell L. The cell of Fig. 1 is described in more detail in the preceding article.