Display device having light emitting element layer between substrate and wavelength control layer

1 . A display device comprising:

sub-pixels;

a bank disposed on a substrate and disposed at a boundary between the sub-pixels;

a wavelength control layer including:

wavelength conversion layers disposed in a region surrounded by the bank; and

a light transmitting layer disposed in the sub-pixels;

a color filter layer disposed on the wavelength control layer;

a first capping layer disposed between the light transmitting layer and the color filter layer;

a second capping layer disposed on the color filter layer;

a third capping layer; and

light emitting element layers disposed between the substrate and the wavelength control layer, the light emitting element layers including:

a light emitting element disposed in one of the sub-pixels;

connection electrodes electrically connected to ends of the light emitting element,

wherein each of the wavelength conversion layers contacts at least one of the connection electrodes,

wherein the sub-pixels include:

a first sub-pixel;

a second sub-pixel; and

a third sub-pixel, and

wherein the wavelength conversion layers include:

a first wavelength conversion layer disposed in the first sub-pixel; and

a second wavelength conversion layer disposed in the second sub-pixel,

wherein the light transmitting layer is disposed on the first wavelength conversion layer in the first sub-pixel,

wherein the third capping layer is disposed between the light transmitting layer and the first wavelength conversion layer and disposed between the light transmitting layer and the second wavelength conversion layer,

wherein the light transmitting layer is disposed on the second wavelength conversion layer in the second sub-pixel,

wherein the light transmitting layer is disposed in the third sub-pixel,

wherein at least a portion of the third capping layer contacts at least one of the connection electrodes disposed in the third sub-pixel, and

wherein the color filter layer includes color filters, and a first light blocking member disposed between the color filters, and

wherein the first light blocking member is disposed between the light transmitting layer and the third capping layer, and overlaps the bank in a plan view.

2 . The display device of claim 1 , wherein

the first wavelength conversion layer contacts at least one of the connection electrodes disposed in the first sub-pixel,

the second wavelength conversion layer contacts at least one of the connection electrodes disposed in the second sub-pixel, and

the light transmitting layer contacts at least one of the connection electrodes disposed in the third sub-pixel.

3 . The display device of claim 1 , wherein the color filter layer includes:

a first color filter disposed in the first sub-pixel;

a second color filter disposed in the second sub-pixel; and

a third color filter disposed in the third sub-pixel.

4 . The display device of claim 3 , wherein

a light emitted from the light emitting element disposed in the first sub-pixel passes through the first wavelength conversion layer and the light transmitting layer and is incident to the first color filter,

a light emitted from the light emitting element disposed in the second sub-pixel passes through the second wavelength conversion layer and the light transmitting layer and is incident to the second color filter, and

a light emitted from the light emitting element disposed in the third sub-pixel passes through the light transmitting layer and is incident to the third color filter.

5 . The display device of claim 4 , wherein

the light emitting element disposed in each of the first sub-pixel, the second sub-pixel, and the third sub-pixel emits a first color light,

the light incident to the first color filter is converted into a second color light in the first wavelength conversion layer,

the light incident to the second color filter is converted into a third color light in the second wavelength conversion layer, and

the light incident to the third color filter is the first color light that passes through the light transmitting layer.

6 . The display device of claim 3 , wherein

the first light blocking member is disposed between the first color filter and the second color filter and disposed between the second color filter and the third color filter, and

the first light blocking member overlaps the bank in a plan view.

7 . The display device of claim 1 , wherein the light transmitting layer overlaps the bank in a plan view, and has a top surface that is flat.

8 . The display device of claim 1 ,

wherein the first capping layer contacts a top surface of the light transmitting layer.

9 . The display device of claim 8 , further comprising:

an encapsulation layer disposed on the second capping layer.

10 . The display device of claim 1 , wherein

the color filter layer further includes a second light blocking member disposed between the color filters, and

the second light blocking member being disposed between the first capping layer and the second capping layer, and overlapping the first light blocking member in a plan view.