<p>A display device or optical switch, based on layer break up or layer displacement having at least two different states, in which one of the fluids (5) e. g. oil in a first state adjoins at least a first support plate (3) and in the second state the other fluid (6) at least partly adjoins the first support plate, in which sub-picture elements are separated by areas (13) having a hydrophilic surface.</p>
