Display device
A display device includes: a base layer; a pixel layer 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 on the encapsulation layer, and having a first opening corresponding to the light receiving element, and a second opening corresponding to the light emitting element; a polarizing plate on the black matrix; a wavelength pattern on the polarizing plate to delay a phase of light, the wavelength pattern overlapping with the first opening in a thickness direction, and not overlapping with the second opening in the thickness direction; an adhesive layer on the polarizing plate and the wavelength pattern; and a window on the adhesive layer.
1 . A display device comprising:
a base layer;
a pixel layer on the base layer, and comprising a light emitting element and a light receiving element;
an encapsulation layer covering the pixel layer;
a black matrix on the encapsulation layer, and having a first opening corresponding to the light receiving element, and a second opening corresponding to the light emitting element;
a color filter on the black matrix, overlapping with the light receiving element in the first opening and the light emitting element in the second opening, and located between the first opening and the second opening on a top surface of the black matrix;
a linear polarizer on the color filter;
a first wavelength plate on the linear polarizer, and configured to delay a phase of light; and
a window on the first wavelength plate.
2 . The display device according to claim 1 , wherein the first wavelength plate is configured to delay the phase of light by 45 degrees.
3 . The display device according to claim 1 , wherein the linear polarizer is configured to transmits only a component from among components of light that vibrates in a 90 degree direction of a phase axis.
4 . The display device according to claim 3 , wherein the linear polarizer is located between the color filter and the first wavelength plate.
5 . The display device according to claim 1 , further comprising:
a second wavelength plate between the first wavelength plate and the linear polarizer.
6 . The display device according to claim 5 , wherein the second wavelength plate is configured to delay a phase of light by 90 degrees.
7 . The display device according to claim 1 , wherein the color filter comprises:
a first color filter corresponding to the light emitting element; and
a second color filter corresponding to the light receiving element.
8 . The display device according to claim 7 , wherein the first color filter is any one of a red color filter, a green color filter, or a blue color filter according to a color of light emitted from the light emitting element, and the second color filter is the green color filter.
9 . The display device according to claim 1 , further comprising:
a touch sensor layer between the encapsulation layer and the black matrix.
10 . The display device according to claim 1 , further comprising:
an adhesive layer between the first wavelength plate and the window.
11 . The display device according to claim 1 , further comprising:
a panel driver configured to supply a driving signal for fingerprint sensing to the light emitting element; and
a sensor driver configured to calculate a fingerprint signal based on a difference between a light amount corresponding to a ridge of a fingerprint and a light amount corresponding to a valley of the fingerprint from a sensing signal received from the light receiving element.
12 . The display device according to claim 11 , wherein the light amount corresponding to the ridge of the fingerprint is greater than a reflection light amount corresponding to the valley of the fingerprint.