Display substrate including an anode comprising a main body and a protrusion portion and a display device having the same
View Patent ↗A display substrate and a display device. The display substrate includes a driving substrate, an anode layer, a pixel definition layer, a light emitting functional layer, a cathode layer and an encapsulation layer; the driving circuit includes at least one transistor, the at least one transistor includes a semiconductor layer, the anode layer includes a plurality of anodes, the display substrate includes a plurality of pixel openings; the plurality of pixel openings are configured to at least overlap with the plurality of anodes; each of the anodes includes a main body portion and a protrusion portion, the protrusion portion is connected with the main body portion; the light emitting functional layer includes a plurality of light emitting portions which are arranged in contact with the main body portions of the plurality of anodes.
1 . A display substrate, comprising:
a driving substrate, comprising a substrate and a driving circuit;
a first planarization layer, located on the driving circuit;
an anode layer, located at a side of the first planarization layer away from the driving substrate;
a pixel definition layer, located at a side of the anode layer away from the driving substrate;
a light emitting functional layer, located at a side of the anode layer away from the driving substrate;
a cathode layer, located at a side of the light emitting functional layer away from the driving substrate; and
an encapsulation layer, located at a side of the cathode layer away from the driving substrate;
wherein the driving circuit comprises at least one transistor, the at least one transistor comprises a semiconductor layer,
the anode layer comprises a plurality of anodes, the display substrate comprises a plurality of pixel openings, and the plurality of pixel openings are located at a side of the plurality of anodes away from the driving substrate, the plurality of pixel openings are configured to at least overlap with the plurality of anodes;
each of the anodes comprises a main body portion and a protrusion portion, the protrusion portion is connected with the main body portion, a size of the protrusion portion in a first direction is larger than a size of the main body portion in the first direction, the light emitting functional layer comprises a plurality of light emitting portions, and the plurality of light emitting portions are arranged in contact with main body portions of the plurality of anodes,
a distance between a surface of the main body portion away from the substrate and a surface of the first planarization layer away from the substrate is smaller than a distance between a surface of the protrusion portion away from the substrate and a surface of the first planarization layer away from the substrate.
2 . The display substrate according to claim 1 , wherein an orthographic projection of the pixel definition layer on the driving substrate is overlapped with an orthographic projection of the protrusion portion on the driving substrate, the pixel definition layer comprises a pixel definition portion, and the pixel definition portion comprises:
a pixel definition planarization portion, located between two adjacent anodes; and
protruding structures, respectively located at a side of protrusion portions of the two adjacent anodes away from the driving substrate,
wherein the protruding structures are connected by the pixel definition planarization portion.
3 . The display substrate according to claim 2 , wherein each of the protruding structures comprises:
a first side wall, located at a side of the protruding structure close to a center of the main body portion; and
a second side wall, connected with the first side wall,
wherein the second side wall is further away from the driving substrate than the first side wall; and a slope angle of the first side wall is greater than a slope angle of the second side wall.
4 . The display substrate according to claim 3 , wherein each of the protruding structures further comprises:
a third side wall, located at a side of the protruding structure close to the pixel definition planarization portion,
wherein the slope angle of the first side wall is α, the slope angle of the second side wall is β, the slope angle of the third side wall is γ, and α, β, and γ satisfy the following formula:
β
<
γ
<
α
.
5 . The display substrate according to claim 4 , wherein the slope angle α of the first side wall, the slope angle β of the second side wall, and the slope angle γ of the third side wall satisfy the following formula:
(
α
-
β
)
=
i
*
γ
,
wherein a value range of i is from 0.8 to 1.2;
or, the slope angle α of the first side wall, the slope angle β of the second side wall, and the slope angle γ of the third side wall satisfy the following formula:
(
α
-
β
)
=
j
*
(
γ
-
β
)
,
wherein a value range of j is from 1.5 to 3.
6 . The display substrate according to claim 4 , wherein the slope angle α of the first side wall, the slope angle β of the second side wall, and the slope angle γ of the third side wall satisfy the following formula:
(
α
+
β
)
=
k
*
γ
-
β
,
wherein a value range of k is from 2 to 3.
7 . The display substrate according to claim 4 , wherein a size of the first side wall in the first direction is H1, a size of the second side wall in the first direction is H2, a size of the third side wall in the first direction is H3, and H1, H2 and H3 satisfy the following formula:
H
3
*
cos
γ
>
H
2
*
cos
β
>
H
1
*
cos
α
.
8 . The display substrate according to claim 4 , wherein the protrusion portion of each of the anodes comprises a fourth side wall, located at the side of the protrusion portion close to the center of the main body portion,
wherein a slope angle of the fourth side wall is δ, and α, β, and δ satisfy the following formula:
β
<
δ
<
α
.
9 . The display substrate according to claim 8 , wherein the protrusion portion of each of the anodes comprises:
a first sub-anode layer, located at a side of the driving circuit away from the substrate;
a second sub-anode layer, located at a side of the first sub-anode layer away from the driving substrate; and
a third sub-anode layer, located at a side of the second sub-anode layer away from the driving substrate,
one end of the first sub-anode layer away from the main body portion comprises a bulge portion, and a thickness of the bulge portion in the first direction is greater than an average thickness of the first sub-anode layer in the first direction.
10 . The display substrate according to claim 9 , wherein one end of the third sub-anode layer away from the main body portion is bent in a direction close to the first sub-anode layer.
11 . The display substrate according to claim 9 , wherein the protrusion portion of each of the anodes further comprises:
a fourth sub-anode layer, located between the second sub-anode layer and the third sub-anode layer, wherein a size of the fourth sub-anode layer in the second direction is smaller than a size of the second sub-anode layer in the second direction.
12 . The display substrate according to claim 11 , wherein a size of a part of the third sub-anode layer going beyond the fourth sub-anode layer in the second direction is smaller than a size in the second direction of the overlapping region of the orthographic projection of the pixel definition layer on the driving substrate and the orthographic projection of the protrusion portion on the driving substrate.
13 . The display substrate according to claim 11 , wherein the second sub-anode layer comprises a fifth side wall, located at a side of the second sub-anode layer away from the main body portion, and the fourth sub-anode layer comprises a sixth side wall, located at a side of the fourth sub-anode layer away from the main body portion,
a slope angle of the fifth side wall is greater than the slope angle of the fourth side wall, a slope angle of the sixth side wall is greater than the slope angle of the fourth side wall, and the slope angle of the fifth side wall is greater than the slope angle of the sixth side wall.
14 . The display substrate according to claim 1 , wherein the encapsulation layer comprises:
an inorganic encapsulation layer, located at a side of the cathode layer away from the driving substrate,
wherein the inorganic encapsulation layer comprises a plurality of sub-inorganic encapsulation layers.
15 . The display substrate according to claim 14 , wherein, in a direction away from the driving substrate, refractive indexes of the plurality of sub-inorganic encapsulation layers first increase and then decrease.
16 . The display substrate according to claim 14 , wherein each of the sub-inorganic encapsulation layers comprises: alternately arranged flat regions and double arch interval regions, a first arch region located at a side of one flat region away from one double arch interval region, a second arch region between the flat region and the double arch interval region, and a third arch region located at a side of the flat region away from the second arch region, and
the first arch region and the second arch region are symmetrically arranged with respect to a center of the flat region.
17 . The display substrate according to claim 16 , wherein a size of the flat region in the second direction is L, a distance between a center of the second arch region and a center of the third arch region in the second direction is a first distance D 1 , a distance between a center of the first arch region and the center of the second arch region in the second direction is a second distance D 2 , a radius of curvature of the first arch region, a radius of curvature of the second arch region and a radius of curvature of the third arch region are all R, and
the first distance D 1 satisfies the following formula:
D
2
≤
(
L
+
D
1
)
<
(
L
+
R
)
.
18 . The display substrate according to claim 16 , wherein a size of the flat region in a second direction is L, a distance between a center of the second arch region and a center of the third arch region in the second direction is a first distance D 1 , a distance between a center of the first arch region and the center of the second arch region in the second direction is a second distance D 2 , a radius of curvature of the first arch region, a radius of curvature of the second arch region and a radius of curvature of the third arch region are all R,
the first distance D 1 satisfies the following formula:
(
L
+
D
1
)
≤
D
2
<
(
L
+
R
)
.
19 . The display substrate according to claim 16 , wherein the plurality of sub-inorganic encapsulation layers comprises:
a first sub-inorganic encapsulation layer, located at a side of the cathode layer away from the driving substrate;
a second sub-inorganic encapsulation layer, located at a side of the first sub-inorganic encapsulation layer away from the driving substrate;
a third sub-inorganic encapsulation layer, located at a side of the second sub-inorganic encapsulation layer away from the driving substrate; and
a fourth sub-inorganic encapsulation layer, located at a side of the third sub-inorganic encapsulation layer away from the driving substrate.
20 . The display substrate according to claim 19 , wherein an included angle between a first connection line of an edge of the flat region of the first sub-inorganic encapsulation layer close to the second arch region, an edge of the flat region of the second sub-inorganic encapsulation layer close to the second arch region, an edge of the flat region of the third sub-inorganic encapsulation layer close to the second arch region and an edge of the flat region of the fourth sub-inorganic encapsulation layer close to the second arch region and a surface of the driving substrate away from the anode layer is a first included angle,
an included angle between a second connection line of a vertex of the second arch region of the first sub-inorganic encapsulation layer, a vertex of the second arch region of the second sub-inorganic encapsulation layer, a vertex of the second arch region of the third sub-inorganic encapsulation layer and a vertex of the second arch region of the fourth sub-inorganic encapsulation layer and the surface of the driving substrate away from the anode layer is a second included angle, and
the first included angle is smaller than the second included angle.
21 . The display substrate according to claim 19 , wherein an upper surface of the first arch region of the first sub-inorganic encapsulation layer away from the substrate has a first radius of curvature, an upper surface of the first arch region of the second sub-inorganic encapsulation layer away from the substrate has a second radius of curvature, an upper surface of the first arch region of the third sub-inorganic encapsulation layer away from the substrate has a third radius of curvature, an upper surface of the first arch region of the fourth sub-inorganic encapsulation layer away from the substrate has a fourth radius of curvature,
the first radius of curvature is smaller than the second radius of curvature, the second radius of curvature is smaller than the third radius of curvature, and the third radius of curvature is smaller than the fourth radius of curvature.
22 . A display device, comprising the display substrate according to claim 1 .