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Scheduling for Gray Scale on a Plasma Panel

IP.com Disclosure Number: IPCOM000064349D
Original Publication Date: 1985-Jul-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Criscimagna, TN Hoffman, HS Knecht, WR [+details]

Abstract

Gray scale can be provided on a plasma display panel by controlling the duty factor of the individual pel (picture element). As long as each line is written and/or erased in a total loop of video mode passes or scans through the panel, the advantages of video mode operation on the panel margins are maintained. If in the total loop the periods between repetition at the same line are unequal, then the sum of these periods in one loop provides the duty factor and binary coding can specify ratios that are in an approximately binary relationship. All areas of the panel can provide the same range of duty factor, or specified areas can have a reduced duty factor range including simple on or off.