Color conversion substrate having bank layer defining opening overlapping color filter layers and display device including the same

1 . A color conversion substrate comprising:

a substrate;

color filter layers on the substrate, and arranged in a first direction, and in a second direction orthogonal to the first direction;

a bank layer defining openings overlapping the color filter layers, and comprising:

a first bank part extending in the second direction; and

second bank parts connected to the first bank part and extending in the first direction from a first side of the first bank part; and

wavelength conversion layers in the openings of the bank layer,

wherein the first bank part defines a recess side by side with the second bank parts in the first direction and recessed inwardly from a second side opposite the first side, and

wherein a maximum width of the first bank part in the first direction is greater than a width of a part of the first bank part that is connected to the second bank parts.

2 . The color conversion substrate of claim 1 , wherein an angle between the first direction and the second direction is about 90 degrees or more.

3 . The color conversion substrate of claim 1 , wherein the bank layer further comprises:

a third bank part spaced apart from the first bank part in the first direction with the second bank parts interposed therebetween; and

a bank extension part extending in the first direction, and connected to the first bank part and the third bank part, and

wherein a distance between each of the second bank parts and the bank extension part is less than a distance between the bank extension part and another bank extension part.

4 . The color conversion substrate of claim 3 , wherein the distance between each of the second bank parts and the bank extension part is less than a width of each of the openings.

5 . The color conversion substrate of claim 1 , wherein the color filter layers are on the bank layer to partially overlap each other.

6 . The color conversion substrate of claim 1 , further comprising a light-blocking member on the substrate and extending in the first direction and the second direction,

wherein the color filter layers are spaced apart from each other with the light-blocking member interposed therebetween.

7 . The color conversion substrate of claim 1 , further comprising:

a first capping layer on the color filter layers;

a second capping layer on the wavelength conversion layers and the bank layer; and

a third capping layer on the second capping layer,

wherein the wavelength conversion layers are on the first capping layer.

8 . The color conversion substrate of claim 7 , wherein a part of the third capping layer on the second capping layer does not overlap the bank layer and the wavelength conversion layers.

9 . A color conversion substrate comprising:

a substrate;

color filter layers on the substrate, and arranged in a first direction, and in a second direction orthogonal to the first direction;

a bank layer defining openings overlapping the color filter layers, and comprising:

a first bank part extending in the second direction; and

second bank parts connected to the first bank part and extending in the first direction from a first side of the first bank part; and

wavelength conversion layers in the openings of the bank layer,

wherein the first bank part defines a recess side by side with the second bank parts in the first direction and recessed inwardly from a second side opposite the first side, and

wherein the first bank part becomes wider in the second direction from an intersection.

10 . A color conversion substrate comprising:

a substrate;

color filter layers on the substrate, and arranged in a first direction, and in a second direction orthogonal to the first direction;

a bank layer defining openings overlapping the color filter layers, and comprising:

a first bank part extending in the second direction; and

second bank parts extending in the first direction from a first side of the first bank part; and

wavelength conversion layers in the openings of the bank layer,

wherein the first bank part defines a recess recessed inwardly from a part of a second side opposite the first side,

wherein at least a part of each of the second bank parts is spaced apart from the first bank part, and

wherein a width of each of the first bank part and the second bank parts is greater than a distance between the first bank part and each of the second bank parts.

11 . The color conversion substrate of claim 10 , wherein the first bank part comprises a first sub-bank part and a second sub-bank part spaced apart from each other in the second direction, and

wherein each of the second bank parts is spaced apart from each of the first sub-bank part and the second sub-bank part at an intersection where the first sub-bank part and the second sub-bank part are spaced apart from each other.

12 . The color conversion substrate of claim 11 , wherein, in each of the second bank parts, a part facing the first sub-bank part and the second sub-bank part is narrower than other parts.

13 . The color conversion substrate of claim 12 , wherein the first bank part and each of the second bank parts are at least partially in contact with each other.

14 . A display device comprising:

a display substrate comprising a first substrate and light-emitting elements on the first substrate;

a bank layer on the display substrate, extending in a first direction and in a second direction that is orthogonal to the first direction, and surrounding openings;

wavelength conversion layers in the openings of the bank layer; and

color filter layers on the bank layer and the wavelength conversion layers to overlap the openings,

wherein the bank layer comprises:

a first bank part extending in the second direction; and

second bank parts extending in the first direction from a first side of the first bank part in the first direction and connected to the first bank part,

wherein the first bank part defines a recess that is side by side with the second bank parts in the first direction and that is recessed inwardly from a part of a second side that is opposite the first side, and

wherein a maximum width of the first bank part measured in the first direction is greater than a width of a part of the first bank part connected to the second bank parts.

15 . The display device of claim 14 , further comprising:

a first capping layer between the color filter layers and the bank layer and the wavelength conversion layers;

a second capping layer between the wavelength conversion layers and the bank layer and the first substrate; and

a third capping layer between the second capping layer and the first substrate,

wherein a part of the third capping layer on the second capping layer does not overlap the bank layer and the wavelength conversion layers.

16 . The display device of claim 14 , wherein the display substrate comprises anodes on the first substrate, and a cathode on the anodes, and

wherein the light-emitting elements are between respective ones of the anodes and the cathode.

17 . The display device of claim 14 , wherein the display substrate comprises:

a first electrode and a second electrode on the first substrate, and spaced apart from each other;

a first connection electrode on the first electrode; and

a second connection electrode on the second electrode,

wherein one of the light-emitting elements is on the first electrode and the second electrode, and contacts the first connection electrode and the second connection electrode.

18 . A display device comprising:

a display substrate comprising a first substrate and light-emitting elements on the first substrate;

a bank layer on the display substrate, extending in a first direction and in a second direction that is orthogonal to the first direction, surrounding openings, and comprising:

a first bank part extending in the second direction; and

second bank parts extending in the first direction from a first side of the first bank part in the first direction;

wavelength conversion layers in the openings of the bank layer; and

color filter layers on the bank layer and the wavelength conversion layers to overlap the openings,

wherein the first bank part defines a recess that is recessed inwardly from a second side that is opposite the first side,

wherein the first bank part comprises a first sub-bank part and a second sub-bank part spaced apart from each other in the second direction, and

wherein each of the second bank parts is spaced apart from each of the first sub-bank part and the second sub-bank part at an intersection where the first sub-bank part and the second sub-bank part are spaced apart from each other.

19 . The display device of claim 18 , wherein a width of each of the first bank part and the second bank parts is greater than a distance between the first bank part and each of the second bank parts, and

wherein, in each of the second bank parts, a part facing the first sub-bank part and the second sub-bank part is narrower than other parts.

20 . A display device comprising:

a display substrate comprising a first substrate and light-emitting elements on the first substrate;

a bank layer on the display substrate, extending in a first direction and in a second direction that is orthogonal to the first direction, and surrounding openings;

wavelength conversion layers in the openings of the bank layer; and

color filter layers on the bank layer and the wavelength conversion layers to overlap the openings,

wherein the bank layer comprises a first bank part extending in the second direction, and second bank parts extending in the first direction from a first side of the first bank part in the first direction,

wherein the openings comprise a first opening, a second opening spaced apart from the first opening in the second direction, and a third opening spaced apart from the first opening in the first direction, and

wherein the first bank part defines a recess between the first opening and the third opening and recessed inwardly from a second side that is opposite the first side.

21 . The display device of claim 20 , wherein the color filter layers comprise a first color filter layer overlapping the first opening, and a second color filter layer overlapping the second opening, and

wherein the wavelength conversion layers comprise a first wavelength conversion layer in the first opening, and a second wavelength conversion layer in the second opening.