Display substrate, manufacturing method thereof, and display device
The present disclosure provides a display substrate, a manufacturing method thereof and a display device. The display substrate includes: a substrate structure including a base substrate; and a light-emitting structure, a pixel defining layer and a connection structure, wherein the light-emitting structure includes a conductive structure layer, a first light-emitting layer and a first electrode layer. The connection structure includes a first conductive layer, a second conductive layer and a top structure, wherein an orthographic projection of the second conductive layer on the base substrate is inside an orthographic projection of the top structure on the base substrate, and the top structure includes a second light-emitting layer, wherein an orthographic projection of the first light-emitting layer on the base substrate partially overlaps with an orthographic projection of the second light-emitting layer on the base substrate.
1 . A display substrate, comprising:
a substrate structure comprising a base substrate; and
a light-emitting structure, a pixel defining layer and a connection structure which are on a side of the base substrate, wherein at least a portion of the light-emitting structure is in an opening of the pixel defining layer, and the connection structure is on a side of the pixel defining layer away from the opening, wherein:
the light-emitting structure comprises:
a conductive structure layer on a side of the base substrate;
a first light-emitting layer on a side of the conductive structure layer away from the base substrate; and
a first electrode layer on a side of the first light-emitting layer away from the base substrate, wherein a portion of the first electrode layer and a portion of the first light-emitting layer are on a side surface of the pixel defining layer, the side surface of the pixel defining layer being between the opening and the connection structure and close to the connection structure, and the first electrode layer is electrically connected to the connection structure; and
the connection structure comprises:
a first conductive layer on a side of the base substrate;
a second conductive layer on a side of the first conductive layer away from the base substrate; and
a top structure on a side of the second conductive layer away from the base substrate, wherein an orthographic projection of the second conductive layer on the base substrate is inside an orthographic projection of the top structure on the base substrate, and the top structure comprises a second light-emitting layer;
wherein an orthographic projection of the first light-emitting layer on the base substrate partially overlaps with an orthographic projection of the second light-emitting layer on the base substrate.
2 . The display substrate according to claim 1 , wherein:
the top structure is spaced apart from the pixel defining layer by a gap, and the second conductive layer is spaced apart from the pixel defining layer by the gap;
the first light-emitting layer comprises an extension portion extending into the gap from the side surface of the pixel defining layer, the extension portion comprising a first extension portion and a second extension portion connected to the first extension portion, wherein the second extension portion is on a side of the first extension portion away from the pixel defining layer,
wherein a distance between the second extension portion and the second conductive layer is less than a thickness of the first light-emitting layer along a direction perpendicular to the base substrate.
3 . The display substrate according to claim 2 , wherein:
the first extension portion has a first slope angle, the first slope angle being an angle between a first slope surface of the first extension portion and a bottom surface of the first extension portion;
the second extension portion has a second slope angle, the second slope angle being an angle between a second slope surface of the second extension portion and a bottom surface of the second extension portion;
wherein the first slope angle is different from the second slope angle.
4 . The display substrate according to claim 3 , wherein the first slope angle is greater than the second slope angle.
5 . The display substrate according to claim 3 , wherein the top structure further comprises:
a third conductive layer between the second conductive layer and the second light-emitting layer; and
a fourth conductive layer on a side of the second light-emitting layer away from the base substrate;
wherein the second light-emitting layer has a third slope angle, the third slope angle being an angle between a side surface of the second light-emitting layer and a bottom surface of the second light-emitting layer.
6 . The display substrate according to claim 5 , wherein;
the first slope angle is less than the third slope angle; and/or
the second slope angle is less than the third slope angle.
7 . The display substrate according to claim 5 , wherein the second conductive layer has a fourth slope angle, the fourth slope angle being an angle between a side surface of the second conductive layer and a bottom surface of the second conductive layer.
8 . The display substrate according to claim 7 , wherein the fourth slope angle is less than the third slope angle.
9 . The display substrate according to claim 7 , wherein the first slope angle is less than the fourth slope angle, and the second slope angle is less than the fourth slope angle.
10 . The display substrate according to claim 5 , wherein the conductive structure layer comprises:
a fifth conductive layer on a side of the base substrate, wherein the fifth conductive layer is in a same layer as the first conductive layer, the fifth conductive layer is isolated from the first conductive layer, and a material of the fifth conductive layer is the same as a material of the first conductive layer;
a third electrode layer on a side of the fifth conductive layer away from the base substrate, wherein the third electrode layer is in a same layer as the second conductive layer, the third electrode layer is isolated from the second conductive layer, and a material of the third electrode layer is the same as a material of the second conductive layer;
a sixth conductive layer on a side of the third electrode layer away from the base substrate, wherein the sixth conductive layer is in a same layer as the third conductive layer, the sixth conductive layer is isolated from the third conductive layer, and a material of the sixth conductive layer is the same as a material of the third conductive layer.
11 . The display substrate according to claim 5 , wherein the second light-emitting layer is in a same layer as the first light-emitting layer, and a material of the second light-emitting layer is the same as a material of the first light-emitting layer.
12 . The display substrate according to claim 2 , wherein the distance is greater than a length of a bottom surface of the first extension portion along a direction from the side surface of the pixel defining layer to the gap.
13 . The display substrate according to claim 2 , wherein the thickness of the first light-emitting layer is less than a length of a bottom surface of the second extension portion along a direction from the side surface of the pixel defining layer to the gap.
14 . The display substrate according to claim 2 , wherein;
orthographic projection of the first extension portion on the base substrate does not overlap with the orthographic projection of the second light-emitting layer on the base substrate; and/or
an orthographic projection of the second extension on the base substrate is inside the orthographic projection of the top structure on the base substrate.
15 . The display substrate according to claim 1 , wherein the substrate structure further comprises:
a second electrode layer on a side of the base substrate, wherein the second electrode layer is electrically connected to the first conductive layer; and
a first insulating layer covering the second electrode layer, wherein the light-emitting structure, the pixel defining layer and the connection structure are on a side of the first insulating layer away from the base substrate.
16 . The display substrate according to claim 15 , wherein the substrate structure further comprises:
a buffer layer between the base substrate and the second electrode layer;
an active layer on a side of the buffer layer away from the base substrate;
a second insulating layer on a side of the active layer away from the base substrate;
a gate on a side of the second insulating layer away from the base substrate;
an interlayer dielectric layer on the side of the buffer layer away from the base substrate, wherein the interlayer dielectric layer covers the active layer, the second insulating layer and the gate; and
a fourth electrode layer and a fifth electrode layer which are on a side of the interlayer dielectric layer away from the base substrate, wherein the fourth electrode layer is electrically connected to the active layer through a first conductive via hole, the fifth electrode layer is electrically connected to the active layer through a second conductive via hole, the first conductive via hole and the second conductive via hole each passing through the interlayer dielectric layer, and the fourth electrode layer and the fifth electrode layer are in a same layer as the second electrode layer.
17 . The display substrate according to claim 16 , wherein:
the first insulating layer comprises: a passivation layer covering the second electrode layer, the fourth electrode layer and the fifth electrode layer, and a planarization layer on a side of the passivation layer away from the base substrate;
the first conductive layer is electrically connected to the second electrode layer through a third conductive via hole, the third conductive via hole passing through the passivation layer and the planarization layer; and
the conductive structure layer is electrically connected to the fourth electrode layer or the fifth electrode layer through a fourth conductive via hole, the fourth conductive via hole passing through the passivation layer and the planarization layer.
18 . A display device, comprising: the display substrate according to claim 1 .
19 . A manufacturing method for a display substrate, comprising:
providing a substrate structure, wherein the substrate structure comprises a base substrate; and
forming a light-emitting structure, a pixel defining layer and a connection structure on a side of the base substrate, wherein at least a portion of the light-emitting structure is in an opening of the pixel defining layer, and the connection structure is on a side of the pixel defining layer away from the opening, wherein:
the light-emitting structure comprises: a conductive structure layer on a side of the base substrate, a first light-emitting layer on a side of the conductive structure layer away from the base substrate, and a first electrode layer on a side of the first light-emitting layer away from the base substrate, wherein a portion of the first electrode layer and a portion of the first light-emitting layer are on a side surface of the pixel defining layer, the side surface of the pixel defining layer being between the opening and the connection structure and close to the connection structure, and the first electrode layer is electrically connected to the connection structure; and
the connection structure comprises: a first conductive layer on a side of the base substrate, a second conductive layer on a side of the first conductive layer away from the base substrate, and a top structure on a side of the second conductive layer away from the base substrate, wherein an orthographic projection of the second conductive layer on the base substrate is inside an orthographic projection of the top structure on the base substrate, and the top structure comprises a second light-emitting layer, wherein an orthographic projection of the first light-emitting layer on the base substrate partially overlaps with an orthographic projection of the second light-emitting layer on the base substrate.
20 . The manufacturing method according to claim 19 , wherein the first light-emitting layer is formed by an evaporation process, and the first electrode layer is formed by a sputtering process.