The disclosure discloses a control method for an electronic device. The electronic device comprises a transparent display screen comprising a display area and an infrared sensor which is disposed below the display area. The control method comprises: acquiring continuous multi-frame environmental images when the electronic device is in a state of incoming call; processing the continuous multi-frame environmental images to collect a plurality of feature points in the environmental images; determining whether the plurality of feature points in the continuous multi-frame environmental images have changed; controlling the transparent display screen to be off when the plurality of feature points have changed; and controlling the infrared sensor to be on to detect a distance of an object to the electronic device. The disclosure also discloses a control device and electronic device.