The invention discloses an electronic device and a signal processing method. The electronic device comprises a display panel and a photosensory membrane, wherein the display panel is used for displaying an image; the photosensory membrane covers the surface of the display panel and is used for receiving a first optical signal when the first optical signal irradiates the photosensory membrane; the light transmittance value of the photosensory membrane is larger than or equal to a preset light transmittance value, so that a user using the electronic device can see the image displayed by the display panel through the photosensory membrane; when the electronic device is in a working state and the photosensory membrane receives the first optical signal, the electronic device can generate and execute a first control instruction corresponding to the first optical signal based on the first corresponding relation between the optical signal and the control instruction.