An electroluminescent display device integrated with a fingerprint sensor, comprising: a display panel (DPNL) comprising a pixel array comprising a plurality of display pixels; a transparent substrate bonded to the top of the display panel (DPNL); an image sensor bonded to the bottom of the display panel (DPNL); a light source placed under one edge of the transparent substrate to face the underside of the transparent substrate, the underside of the transparent substrate facing the display panel; a light-entering element (CHOE) that is placed between the light source and the transparent substrate and is configured to refract light from the light source at an angle of total reflection within the transparent substrate; a light-exiting element (VHOE) that is placed between the display panel (DPNL) and the transparent substrate, on the screen of the display panel (DPNL) where an image is displayed, and is configured to refract part of the light traveling within the transparent substrate so that part of the light traveling within the transparent substrate travels towards the pixel array of the display panel (DPNL) through the underside of the transparent substrate; and a low refractive index layer that is placed between the light-exiting element (VHOE) and the display panel (DPNL) and has a lower refractive index than the light-exiting element (VHOE), wherein each of the display pixels in at least some part of the pixel array on the display panel (DPNL) comprises a light transmission area, the image sensor comprises a plurality of photosensors, one or more of the photosensors are exposed within the light transmission area, and the resolution of the image sensor is higher than or equal to the resolution of the display panel (DPNL). a display panel (DPNL) comprising a pixel array comprising a plurality of display pixels; a transparent substrate bonded to the top of the display panel (DPNL); an image sensor bonded to the bottom of the display panel (DPNL); a light source placed under one edge of the transparent substrate to face the underside of the transparent substrate, the underside of the transparent substrate facing the display panel; a light-entering element (CHOE) that is placed between the light source and the transparent substrate and is configured to refract light from the light source at an angle of total reflection within the transparent substrate; a light-exiting element (VHOE) that is placed between the display panel (DPNL) and the transparent substrate, on the screen of the display panel (DPNL) where an image is displayed, and is configured to refract part of the light traveling within the transparent substrate so that part of the light traveling within the transparent substrate travels towards the pixel array of the display panel (DPNL) through the underside of the transparent substrate; and a low refractive index layer that is placed between the light-exiting element (VHOE) and the display panel (DPNL) and has a lower refractive index than the light-exiting element (VHOE), wherein each of the display pixels in at least some part of the pixel array on the display panel (DPNL) comprises a light transmission area, the image sensor comprises a plurality of photosensors, one or more of the photosensors are exposed within the light transmission area, and the resolution of the image sensor is higher than or equal to the resolution of the display panel (DPNL).