Information terminal

An information terminal comprising a display screen, a first communication device and a second communication device, wherein the information terminal further comprises a camera, a photo capturing unit, a photo gray level analysis unit, an output unit, a display-screen parameter-adjustment unit and a background-illumination-light parameter-adjustment unit, and

• an external illuminating device is used for illuminating the background environment within viewing angle range of a user,
• the camera is used for acquiring a photo analog signal or a photo digital signal of the background environment within the viewing angle range of a user,
• the photo capturing unit is connected to the camera through the first communication device, for converting the photo analog signal or the photo digital signal acquired by the camera into digital photo data,
• the photo gray level analysis unit analyzes a gray level of the photo data, and generates state parameters of the background environment within the viewing angle range of the user according to configuration parameters of the camera, and sends the same to the background-illumination-light parameter-adjustment unit and the display-screen parameter-adjustment unit respectively,
• the background-illumination-light parameter-adjustment unit is connected to background-illumination-light through the second communication device, for generating a control signal according to the state parameter, and sending the same to the output unit,
• the output unit outputs the control signal to the external illumination device for adjusting the illumination parameters of the external illumination device, so that the illumination state of the background environment reaches to a preset parameter, wherein the illumination parameters at least include a brightness and/or a color temperature, and
• the display-screen parameter-adjustment unit adjusts the display parameters of the display screen according to the state parameters of the background environment on the basis of the preset correspondence relationship, so that the display parameters of the display screen match with the adjusted illumination state of the background environment within the viewing of the user, wherein the display parameters at least include a brightness and/or a color temperature.