A display-and-image-pickup device comprising: a display-and-image-pickup panel including a plurality of display pixels and a plurality of image pickup pixels; a lighting device for providing an illumination light source for display and detection of the display-and-image-pickup panel, wherein the lighting device performs on-off switching operation at a predetermined timing in synchronization with an operation timing of the display-and-image-pickup panel; a display drive means for displaying an image by performing a display drive on each of the display pixels; an image pickup drive means for obtaining an image pickup signal from each of the image pickup pixels by performing an image pickup drive on each of the image pickup pixels; and an image processing means for obtaining object information including one or more of position, shape and size of a proximity object through utilizing a picked-up image based on the image pickup signal obtained from each of the image pickup pixels; wherein the image pickup drive means performs an image pickup drive so that when illumination light is emitted from the display-and-image-pickup panel to the proximity object, an electric charge for charging is accumulated in each of the image pickup pixels in accordance with total light amount as a summation of reflected light originating from the illumination light and environment light, and when the illumination light is not emitted from the display-and-image-pickup panel, an electric charge for discharging is released from each of the image pickup pixels in accordance with light amount of the environment light, thereby to obtain the image pickup signal from each of the image pickup pixels; and wherein each of an operation of accumulating the electric charge for charging and an operation of releasing the electric charge for discharging are performed in synchronization with a horizontal period during the display drive, wherein the horizontal period corresponds to the on-off switching operation of the lighting device. a display-and-image-pickup panel including a plurality of display pixels and a plurality of image pickup pixels; a lighting device for providing an illumination light source for display and detection of the display-and-image-pickup panel, wherein the lighting device performs on-off switching operation at a predetermined timing in synchronization with an operation timing of the display-and-image-pickup panel; a display drive means for displaying an image by performing a display drive on each of the display pixels; an image pickup drive means for obtaining an image pickup signal from each of the image pickup pixels by performing an image pickup drive on each of the image pickup pixels; and an image processing means for obtaining object information including one or more of position, shape and size of a proximity object through utilizing a picked-up image based on the image pickup signal obtained from each of the image pickup pixels; wherein the image pickup drive means performs an image pickup drive so that when illumination light is emitted from the display-and-image-pickup panel to the proximity object, an electric charge for charging is accumulated in each of the image pickup pixels in accordance with total light amount as a summation of reflected light originating from the illumination light and environment light, and when the illumination light is not emitted from the display-and-image-pickup panel, an electric charge for discharging is released from each of the image pickup pixels in accordance with light amount of the environment light, thereby to obtain the image pickup signal from each of the image pickup pixels; and wherein each of an operation of accumulating the electric charge for charging and an operation of releasing the electric charge for discharging are performed in synchronization with a horizontal period during the display drive, wherein the horizontal period corresponds to the on-off switching operation of the lighting device.