A method of manufacturing a cell wall assembly for an electro-optic display device with greyscale capability comprises: forming on a substantially planar surface of a transfer carrier, at least one dielectric structure; forming on said at least one dielectric structure at least one electrode structure; wherein said dielectric structure extends in a direction perpendicular to said surface by a distance which varies substantially within the area of the or each electrode structure; adhering said at least one electrode structure to a major surface of a substrate of glass or a plastics material; and removing the transfer carrier. Other aspects of the invention include the cell wall assembly, a device with greyscale capability, a method of manufacturing the device, and the transfer carrier.