An image sensor including: a pixel array disposed under a display panel, the pixel array including a plurality of pixels configured to perform a sensing operation by collecting a photo-charge generated by a light that penetrates the display panel; a row driver configured to drive the plurality of pixels row by row; and a controller configured to control the pixel array and the row driver such that a sensing sensitivity of blue pixels among the plurality of pixels is higher than a sensing sensitivity of red pixels and a sensing sensitivity of green pixels among the plurality of pixels.