An electrowetting element comprising: a first fluid ; a second fluid immiscible with the first fluid; a first support plate and a second support plate , the first fluid and the second fluid located between the first support plate and the second support plate, the first support plate comprising: a first support plate surface, at least one of the first fluid or the second fluid in contact with the first support plate surface; a substrate having a substrate surface; an electrode , the first fluid and the second fluid switchable to a first configuration with a non-zero voltage applied between the electrode and the second fluid; a ridge comprising a substantially parallel ridge surface substantially parallel to the substrate surface and a sloping ridge surface angled relative to the substantially parallel ridge surface, wherein an interior angle within the ridge between a plane of the substantially parallel ridge surface and a plane of the sloping ridge surface is greater than or equal to approximately 135 degrees, or is between approximately 135 degrees and approximately 160 degrees; and a wall located at least partly on the substantially parallel ridge surface, wherein the wall is located along at least part of a perimeter of the electrowetting element and has an inner surface within the electrowetting element. a first fluid ; a second fluid immiscible with the first fluid; a first support plate and a second support plate , the first fluid and the second fluid located between the first support plate and the second support plate, the first support plate comprising: a first support plate surface, at least one of the first fluid or the second fluid in contact with the first support plate surface; a substrate having a substrate surface; an electrode , the first fluid and the second fluid switchable to a first configuration with a non-zero voltage applied between the electrode and the second fluid; a ridge comprising a substantially parallel ridge surface substantially parallel to the substrate surface and a sloping ridge surface angled relative to the substantially parallel ridge surface, wherein an interior angle within the ridge between a plane of the substantially parallel ridge surface and a plane of the sloping ridge surface is greater than or equal to approximately 135 degrees, or is between approximately 135 degrees and approximately 160 degrees; and a wall located at least partly on the substantially parallel ridge surface, wherein the wall is located along at least part of a perimeter of the electrowetting element and has an inner surface within the electrowetting element. a first support plate surface, at least one of the first fluid or the second fluid in contact with the first support plate surface; a substrate having a substrate surface; an electrode , the first fluid and the second fluid switchable to a first configuration with a non-zero voltage applied between the electrode and the second fluid; a ridge comprising a substantially parallel ridge surface substantially parallel to the substrate surface and a sloping ridge surface angled relative to the substantially parallel ridge surface, wherein an interior angle within the ridge between a plane of the substantially parallel ridge surface and a plane of the sloping ridge surface is greater than or equal to approximately 135 degrees, or is between approximately 135 degrees and approximately 160 degrees; and a wall located at least partly on the substantially parallel ridge surface, wherein the wall is located along at least part of a perimeter of the electrowetting element and has an inner surface within the electrowetting element. <EOS>