A light emitting device and a display device having the same that are capable of being manufactured by a simplified manufacturing method and having an improved alignment characteristic of members constituting an electron emission unit of the light emitting device. In one embodiment, the light emitting device includes a first substrate assembly including a first substrate having first recess portions and second recess portions, electron emission regions, first electrodes coupled to the electron emission regions, and second electrodes; and a second substrate assembly facing an inner surface of the first substrate. Here, each of the first recess portions has a first depth, each of the second recess portions has a second depth smaller than the first depth, the first electrodes are positioned within the first recess portions, and the second electrodes are positioned within the second recess portions.