Various improvements are provided in gas-based electrophoretic displays,
including (a) the use of water getters to remove water from the gas; (b)
the use of electron accepting or donating gases; (c) the use of
electrophoretic polymer particles having high glass transition
temperatures; (d) lateral movement of electrophoretic particles within
the display; and (e) the use of variable thickness coatings on electrodes
to provide for gray scale.