A display device, a method for controlling the display device, and a wearable device are provided. The display device includes an organic light-emitting structural layer; at least one control assembly including a color filter layer and a control electrode layer; and a control circuit. The color filter layer is closer to the organic light-emitting structural layer than the control electrode layer, the color filter layer includes color filter regions and light-transmissible regions arranged alternately, the control electrode layer includes first electrodes, each first electrode is on one color filter region corresponding to the first electrode and light transmittance of the first electrode is changeable under voltages. The control circuit is connected to the first electrodes and applies the voltages to the first electrodes so as to control the light transmittance of the first electrodes.