Display device including a photo sensor
A display device according to embodiments of the disclosure includes a base layer, a pixel layer disposed on the base layer and including a light emitting element and a light receiving element, an encapsulation layer covering the pixel layer, a black matrix disposed on the encapsulation layer and including a first opening disposed in a region corresponding to the light receiving element and a second opening disposed in a region corresponding to the light emitting element, a color filter disposed on the black matrix, a refractive layer disposed on the color filter and including a first refractive layer including a third opening disposed in a region corresponding to the first opening and a second refractive layer covering the first refractive layer, and a window disposed on the refractive layer. A cross section of the third opening has a first inclined surface.
1. A display device comprising:
a base layer;
a pixel layer disposed on the base layer and including a light emitting element and a light receiving element;
an encapsulation layer covering the pixel layer;
a black matrix disposed on the encapsulation layer and including a first opening disposed in a region corresponding to the light receiving element and a second opening disposed in a region corresponding to the light emitting element;
a color filter disposed on the black matrix;
a refractive layer disposed on the color filter and including a first refractive layer including a third opening disposed in a region corresponding to the first opening and a second refractive layer covering the first refractive layer; and
a window disposed on the refractive layer,
wherein a cross section of the third opening has a first inclined surface.
2. The display device according to claim 1 , wherein the first inclined surface has a first inclination angle for totally reflecting light reflected from an object that is in contact with the window.
3. The display device according to claim 2 , wherein some of the reflected light reflected by the first inclined surface is incident outside a light receiving area of the light receiving element.
4. The display device according to claim 2 , wherein the first inclination angle is greater than 0° and less than or equal to 57.2°.
5. The display device according to claim 1 , wherein the first inclined surface has a second inclination angle for refracting light reflected from an object that is in contact with the window.
6. The display device according to claim 5 , wherein some of the reflected light refracted by the first inclined surface is incident outside a light receiving area of the light receiving element.
7. The display device according to claim 5 , wherein the second inclination angle is greater than 57.2° and less than 90°.
8. The display device according to claim 1 , wherein a refractive index of the first refractive layer is less than a refractive index of the second refractive layer.
9. The display device according to claim 1 , wherein a width of a sensing area of the light receiving element is calculated by Equation 1 below,
S=P+L 1/ L 2( P+S 0) [Equation 1]
where S is the sensing area, P is a width of the first opening, L 1 is a vertical distance from a lower surface of the black matrix to an upper surface of the window, L 2 is a vertical distance from the lower surface of the black matrix to an upper surface of the light receiving element, and S 0 is a width of the light receiving element.
10. The display device according to claim 9 , wherein the width of the sensing area decreases as an inclination angle of the first inclined surface increase.
11. The display device according to claim 10 , wherein the width of the sensing area having a second inclination angle for refracting the reflected light is less than that having a first inclination angle for totally reflecting the reflected light reflected from an object that is in contact with the window.
12. The display device according to claim 9 , wherein when a thickness of the first refractive layer increases between 0 and a preset value, the width of the sensing area decreases.
13. The display device according to claim 12 , wherein the thickness of the second refractive layer is greater than 0 μm and less than or equal to 6 μm.
14. The display device according to claim 1 , further comprising:
a touch sensor layer disposed between the encapsulation layer and the black matrix.
15. The display device according to claim 1 , wherein the first refractive layer includes a fourth opening disposed in a region corresponding to the second opening and a cross section of the fourth opening has a second inclined surface.
16. The display device according to claim 15 , wherein the second inclined surface has a third inclination angle for totally reflecting emitted light emitted from the light emitting element or a fourth inclination angle for refracting the emitted light.
17. The display device according to claim 16 , wherein the third inclination angle is greater than 0° and less than or equal to 57.2°, and the fourth inclination angle is greater than 57.2° and less than 90°.
18. The display device according to claim 15 , wherein an inclination angle of the first inclined surface and an inclination angle of the second inclined surface are different.
19. The display device according to claim 15 , wherein in a thickness of the first refractive layer, a thickness of an area corresponding to the third opening and a thickness of an area corresponding to the fourth opening are different.
20. The display device according to claim 15 , wherein a width of the third opening is less than a width of the fourth opening.