A display device capable of automatically adjusting displayed image comprising: a shell and a display panel partially exposed from the shell, wherein the display panel faces in a first direction and the display device is configured to show a displayed image on the display panel according to a display signal; a camera assembly disposed on the shell, wherein the camera assembly comprises a first camera device (32, 32') and a second camera device, the first camera device (32, 32') is configured to obtain a first image with a first visual angle (A1, A32, A32') and the second camera device is configured to obtain a second image with a second visual angle (A2, A34), wherein the camera assembly is disposed on the shell such that the first direction is in a range of the first visual angle (A1, A32, A32') and is out of a range of the second visual angle (A2, A34); a storage device configured to store a white list including a plurality of valid face images; an image recognition device disposed in the shell and electrically connecting to the camera assembly, and a signal processor electrically connecting to the display panel and the image recognition device, characterized in that the image recognition device is configured to generate a first instruction when the first image meets a first condition and to generate a second instruction when the second image meets a second condition and the first image does not meet the first condition, the first instruction being different from the second instruction, and the first condition comprises that the first image has a human face not belonging to one of the plurality of valid face images in the white list, and the second condition comprises that the second image has a human face; and in that the signal processor is configured to conceal the image to be displayed according to the first instruction and to generate a reminder message on the display panel according to the second instruction. a shell and a display panel partially exposed from the shell, wherein the display panel faces in a first direction and the display device is configured to show a displayed image on the display panel according to a display signal; a camera assembly disposed on the shell, wherein the camera assembly comprises a first camera device (32, 32') and a second camera device, the first camera device (32, 32') is configured to obtain a first image with a first visual angle (A1, A32, A32') and the second camera device is configured to obtain a second image with a second visual angle (A2, A34), wherein the camera assembly is disposed on the shell such that the first direction is in a range of the first visual angle (A1, A32, A32') and is out of a range of the second visual angle (A2, A34); a storage device configured to store a white list including a plurality of valid face images; an image recognition device disposed in the shell and electrically connecting to the camera assembly, and a signal processor electrically connecting to the display panel and the image recognition device, characterized in that the image recognition device is configured to generate a first instruction when the first image meets a first condition and to generate a second instruction when the second image meets a second condition and the first image does not meet the first condition, the first instruction being different from the second instruction, and the first condition comprises that the first image has a human face not belonging to one of the plurality of valid face images in the white list, and the second condition comprises that the second image has a human face; and in that the signal processor is configured to conceal the image to be displayed according to the first instruction and to generate a reminder message on the display panel according to the second instruction.