A new type of optical bistable device is demonstrated. We report the first observation of optical bistable switching caused by charge‐induced self‐feedback due to field screening in GaAs/AlGaAs multiple quantum well structures, both at room temperature and at low temperature (110 K). A bias voltage supply is directly connected to thep‐i‐ndiode with the multiple quantum well structure to attain optical bistability. Since no external series resistance is required, the device is attractive from the standpoint of a practical application. The mechanism for the self‐feedback underlying the operation of the device is elaborated. The theoretical consideration about the resolvable spot size on the device operation is shown.