An organic light emitting display device includes: a plurality of pixel regions. The first fluid chamber is vacuumized to have a first pressure, and the second fluid chamber is also vacuumized to have a second pressure which is lower than the first pressure. The invention also relates to a method for producing a fluid pump of said type, in which method the shaft is fixed with its first end in a housing, in particular in a plastic housing, of the pump, the inner rotor of the pump is pushed onto the shaft and is secured axially by means of a bearing cap which is placed onto the shaft and is supported by the shaft. The interface mechanism advantageously provides visual indication when the canister is removed and the breathing circuit is operating as a closed loop system, without CO2 filtration. Specifically, the editing module cna provide a feedback mechanisms, such as highlighting or shading, that indicates to the user which portions of handwriting strokes are selected for editing. As a result, parts are reduced in number, reducing manufacturing costs.