The invention provides a display device and a manufacturing method thereof and relates to the display technology field. At least one image sensor is arranged on the emergent light side of a display panel. The display panel comprises an array substrate and a color film substrate which are arranged oppositely on a box. The color film substrate is provided with a black matrix. The orthographic projection of the image sensor on the color film substrate is located in an area where the black matrix is located. The image sensor is configured to carry out image acquisition when the display device is in a self-timer mode. Because the at least one image sensor is arranged on the emergent light side of the display panel, and the orthographic projection of the image sensor on the color film substrateis located in the area where the black matrix is located, when self-timer is needed, the image sensor can realize image acquisition. When the self-timer is finished, because the area where the black matrix is located is not light-transmitting, the image sensor does not affect the normal light output of the display panel. Therefore, full screen display can be realized and the durability of the image sensor is not influenced.