Display device
A display device according to an embodiment includes: a substrate; a transistor on the substrate; a pixel electrode electrically connected to the transistor; a pixel defining layer on the pixel electrode and having a first opening overlapping the pixel electrode; an emission layer on the pixel electrode; a common electrode on the pixel definition layer and the emission layer; an encapsulation layer on the common electrode; a light extraction pattern on the encapsulation layer and having a first refractive index; and a reflection control layer covering the light extraction pattern and having a second refractive index different from the first refractive index.
1 . A display device comprising:
a substrate;
a transistor on the substrate;
a pixel electrode electrically connected to the transistor;
a pixel defining layer on the pixel electrode and having a first opening overlapping the pixel electrode;
an emission layer on the pixel electrode;
a common electrode on the pixel defining layer and the emission layer;
an encapsulation layer on the common electrode;
a light extraction pattern on the encapsulation layer and having a first refractive index; and
a reflection control layer covering the light extraction pattern and having a second refractive index different from the first refractive index,
wherein the first refractive index of the light extraction pattern is 1.40 to 1.59.
2 . The display device of claim 1 , wherein:
the reflection control layer contacts the light extraction pattern.
3 . The display device of claim 1 , wherein:
the light extraction pattern has a mesh shape or a lattice shape.
4 . The display device of claim 3 , wherein:
the light extraction pattern has a cross-section shape of a trapezoid.
5 . The display device of claim 1 , wherein:
the light extraction pattern comprises a microlens array.
6 . The display device of claim 1 , wherein:
the second refractive index is greater than the first refractive index.
7 . The display device of claim 1 , wherein:
the second refractive index is smaller than the first refractive index.
8 . The display device of claim 1 , wherein:
the reflection control layer comprises tetraazaporphyrin.
9 . The display device of claim 1 , wherein:
the reflection control layer has a second opening overlapping the first opening.
10 . The display device of claim 9 , further comprising a flattening layer at least in the second opening and having a third refractive index.
11 . The display device of claim 10 , wherein:
the third refractive index is the same as the second refractive index.
12 . The display device of claim 10 , wherein:
the third refractive index is greater than the second refractive index.
13 . The display device of claim 10 , wherein:
the flattening layer comprises a portion in the second opening and a portion on the reflection control layer.
14 . The display device of claim 10 , wherein:
an upper surface of the reflection control layer and an upper surface of the flattening layer form a flat surface.
15 . The display device of claim 1 , further comprising:
a touch conductive layer on the encapsulation layer; and
an insulation layer on the touch conductive layer,
wherein the light extraction pattern is on the insulation layer.
16 . A display device comprising:
a substrate;
a transistor on the substrate;
a pixel electrode electrically connected to the transistor;
a pixel defining layer on the pixel electrode and having a first opening overlapping the pixel electrode;
an emission layer on the pixel electrode;
a common electrode on the pixel defining layer and the emission layer;
an encapsulation layer on the common electrode;
a reflection control layer on the encapsulation layer, comprising scatterers, and having a second opening overlapping the first opening; and
a flattening layer in at least the second opening,
wherein:
the scatterers are distributed at ⅔ or less of a height of the reflection control layer in the reflection control layer.
17 . The display device of claim 16 , wherein:
the reflection control layer comprises tetraazaporphyrin.
18 . The display device of claim 16 , further comprising:
a touch conductive layer on the encapsulation layer; and
an insulation layer on the touch conductive layer,
wherein the reflection control layer is on the insulation layer.
19 . The display device of claim 16 , further comprising a light blocking member overlapping the reflection control layer.