Method and apparatus to detect three-dimensional pattern information of a touch object
A display device includes a substrate, display elements, a window, and a photo sensor array. The substrate includes a display area and a non-display area. The display elements overlap the display area. The window is disposed on the substrate. The photo sensor array is disposed between the substrate and the window. The photo sensor array is configured to sense three-dimensional pattern information (e.g., epidermal ridge information) of a user via light reflected from a touch input of the user. One or more of the display elements is configured to illuminate a contact area of the touch input with the light.
1. A display device comprising:
a substrate comprising:
a display area; and
a bezel area outside the display area, the bezel area forming at least one edge of the substrate;
pixel regions overlapping the display area;
a window disposed on the substrate; and
a photo sensor array overlapping a portion of the bezel area and being stacked between the substrate and the window, the photo sensor array being configured to sense epidermal ridge information of a user via light reflected from a touch input of the user,
wherein one or more of the pixel regions is configured to illuminate a contact area of the touch input with the light.
2. The display device of claim 1 , wherein:
the photo sensor array is disposed on a first surface of the window;
the contact area is disposed on a second surface of the window, the second surface opposing the first surface; and
the contact area overlaps a portion of the display area.
3. The display device of claim 2 , wherein the contact area overlaps a portion of the bezel area.
4. The display device of claim 1 , wherein:
a first side of the contact area is adjacent to the photo sensor array; and
a second side of the contact area overlaps some of the one or more pixel regions, the second side opposing the first side.
5. The display device of claim 4 , wherein the first side is spaced apart from the photo sensor array by a determined distance.
6. The display device of claim 1 , wherein each of the pixel regions comprises:
a thin film transistor disposed on the substrate; and
an organic light emitting layer electrically connected to the thin film transistor.
7. The display device of claim 1 , wherein the photo sensor array comprises a photo sensitive transistor configured to detect the light reflected from the touch input.
8. The display device of claim 7 , wherein:
the pixel regions are spaced apart from one another along a first direction; and
the photo sensor array longitudinally extends along a second direction crossing the first direction.
9. The display device of claim 6 , further comprising:
an encapsulation layer overlapping the pixel regions and the photo sensor array, the organic light emitting layer being sealed between the encapsulation layer and the substrate,
wherein a thickness of the encapsulation layer overlapping the organic light emitting layer is different from a thickness of the encapsulation layer overlapping the photo sensor array.
10. The display device of claim 9 , wherein the encapsulation layer is stacked between the photo sensor array and the substrate.
11. The display device of claim 9 , wherein the photo sensor array is sealed between the encapsulation layer and the substrate.
12. The display device of claim 1 , further comprising:
pixel electrodes disposed on the substrate, each of the pixel regions comprising a pixel electrode among the pixel electrodes; and
a sensor readout line disposed on the substrate and being electrically connected to the photo sensor array,
wherein the sensor readout line is in a same layer as the pixel electrodes or in a layer closer to the window than a layer in which the pixel electrodes are disposed.