A flat panel display embedding an image sensor comprising: a display panel including a display area and a non-display area; and a directional optical unit attached to the display panel, comprising: a first cover plate and a second cover plate facing each other; a first low refractive layer disposed between the first and second cover plates (CP1, CP2); a light radiating film (VHOE) disposed under the second cover plate and having a length corresponding to the display area; a light incident film (CHOE) disposed under the second cover plate and outside the display area at one lateral side of the light radiating film (VHOE); a second low refractive layer disposed under the light radiating film (VHOE) and the light incident film (CHOE) and attached on the display panel; and a light source disposed at the lateral side of the display panel and facing the light incident film (CHOE), wherein the light source is configured to provide an incident light to an incident point defined on a surface of the light incident film (CHOE); wherein the light incident film (CHOE) includes a first holographic pattern configured to convert the incident light to a propagating light having an incident angle (θ) satisfying an internal total reflection condition of the second cover plate, and send the propagating light into the second cover plate; and wherein the light radiating film (VHOE) includes a second holographic pattern configured to convert some of the propagating light into the sensing light having a reflection angle (α) which satisfies a total reflection condition at a top surface of the first cover plate (CP 1) and a transmitting condition through the first low refractive layer and the second low refractive layer, and wherein the display panel is located under the directional optical unit and the image sensor is disposed in the display panel and configured to detect the sensing light. a display panel including a display area and a non-display area; and a directional optical unit attached to the display panel, comprising: a first cover plate and a second cover plate facing each other; a first low refractive layer disposed between the first and second cover plates (CP1, CP2); a light radiating film (VHOE) disposed under the second cover plate and having a length corresponding to the display area; a light incident film (CHOE) disposed under the second cover plate and outside the display area at one lateral side of the light radiating film (VHOE); a second low refractive layer disposed under the light radiating film (VHOE) and the light incident film (CHOE) and attached on the display panel; and a light source disposed at the lateral side of the display panel and facing the light incident film (CHOE), wherein the light source is configured to provide an incident light to an incident point defined on a surface of the light incident film (CHOE); wherein the light incident film (CHOE) includes a first holographic pattern configured to convert the incident light to a propagating light having an incident angle (θ) satisfying an internal total reflection condition of the second cover plate, and send the propagating light into the second cover plate; and wherein the light radiating film (VHOE) includes a second holographic pattern configured to convert some of the propagating light into the sensing light having a reflection angle (α) which satisfies a total reflection condition at a top surface of the first cover plate (CP 1) and a transmitting condition through the first low refractive layer and the second low refractive layer, and wherein the display panel is located under the directional optical unit and the image sensor is disposed in the display panel and configured to detect the sensing light. a first cover plate and a second cover plate facing each other; a first low refractive layer disposed between the first and second cover plates (CP1, CP2); a light radiating film (VHOE) disposed under the second cover plate and having a length corresponding to the display area; a light incident film (CHOE) disposed under the second cover plate and outside the display area at one lateral side of the light radiating film (VHOE); a second low refractive layer disposed under the light radiating film (VHOE) and the light incident film (CHOE) and attached on the display panel; and a light source disposed at the lateral side of the display panel and facing the light incident film (CHOE), wherein the light source is configured to provide an incident light to an incident point defined on a surface of the light incident film (CHOE); wherein the light incident film (CHOE) includes a first holographic pattern configured to convert the incident light to a propagating light having an incident angle (θ) satisfying an internal total reflection condition of the second cover plate, and send the propagating light into the second cover plate; and wherein the light radiating film (VHOE) includes a second holographic pattern configured to convert some of the propagating light into the sensing light having a reflection angle (α) which satisfies a total reflection condition at a top surface of the first cover plate (CP 1) and a transmitting condition through the first low refractive layer and the second low refractive layer, and wherein the display panel is located under the directional optical unit and the image sensor is disposed in the display panel and configured to detect the sensing light.