A control method, comprising: a photo analog signal or a photo digital signal of the background environment within the viewing angle range of a use is captured by a camera (2), the photo analog signal or the photo digital signal is converted into digital photo data, a gray level analysis with respect to the photo data is performed, a state parameter of the background environment within the viewing angle range of the user is generated, based on a preset correspondence relationship between a background light and a display light, display parameters of a display screen (1) are adjusted according to the state parameter of the background environment, and/or based on a preset correspondence relationship between the background light and a compensating light, an illumination parameter of a background illumination light is adjusted according to the state parameter of the background environment, thus allowing the display parameters of the display screen (1) to match an illumination state of the background environment within the viewing angle range of the user, wherein the display parameters at least comprise brightness and/or color temperature.