Sequential Refresh of Electrochromic Matrix Displays
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
An earlier article [*] proposes that the display image is refreshed progressively on a non-sequential or random basis. This disclosure describes two sequential refresh methods using the hardware shown in the above reference. Firstly, blocks are erased sequentially in multiple areas, and secondly, a venetian blind technique of erasing every nth line, stepping by one line and repeating. There is evidence that bulk erase deterioration is primarily due to absorption of aggregated viologen species on the pel (picture element) surface. As displays are cycled, these aggregated species preferentially accumulate on frequently written pels, and because of the various resistive and electrochemical contributions to the erase process, they have a much more significant impact on bulk erase than on character erase.