Patent ID: 8384985

Claim:
Transflective electrowetting display device having a viewing side and a rear side and comprising a plurality of electrowetting elements having a first support plate facing the viewing side and a second support plate facing the rear side, each electrowetting element comprising: a space between the first support plate and the second support plate and including a first fluid and a second fluid immiscible with each other, the second fluid arranged on the second support plate, the second fluid absorbing at least a part of the optical spectrum, the space having a boundary in the plane of the second support plate and the position of the second fluid being controllable to cover a predetermined area within the boundary and to uncover a further area within the boundary, a structured reflector arranged on the second support plate, covered by the second fluid, comprising within the boundary at least one area transmissive for light incident from the rear side and at least one area reflective for light incident from the viewing side, the at least one transmissive area and the at least one reflective area being arranged such that the predetermined area covered by the second fluid covers a proportion of the at least one transmissive area and a substantially same proportion of the at least one reflective area, wherein the surface of the at least one reflective area of the structured reflector is offset in the direction of the viewing side of the display device with respect to the at least one transmissive area of the structured reflector such that a thickness of the second fluid over the at least one transmissive area is greater than a thickness of the second fluid over the at least one reflective area.