Display substrate and electronic apparatus having concave points within gap between pixel regions
A display substrate and an electronic apparatus are provided. The display substrate includes a base substrate, and a dielectric layer, a first and a second electrode layer and a pixel defining layer thereon. The first electrode layer includes a first electrode and a second electrode spaced with a gap. The dielectric layer includes a first groove exposed by the gap; the second electrode layer includes a concave structure corresponding to the first groove; the pixel defining layer covers the first groove to form a second groove; the display substrate has a cross section, and the concave structure includes a first and a second concave point within the cross section; within the cross section, a distance between a first side surface of the second groove and a first electrode edge of the first electrode is greater than a distance between the first concave point and the first side surface.
1 . A display substrate, comprising:
a base substrate comprising a first subpixel region and a second subpixel region adjacent to each other,
a dielectric layer located on the base substrate, and
a first electrode layer, a pixel defining layer, an organic functional layer and a second electrode layer which are stacked successively on a side, away from the base substrate, of the dielectric layer, the first electrode layer comprising a first electrode in the first subpixel region and
a second electrode in the second subpixel region, a gap is present between the first electrode and the second electrode; a portion, which is corresponding to the gap, of the dielectric layer comprises a first groove, and the gap exposes the first groove; a portion, which is corresponding to the first groove, of the second electrode layer comprises a concave structure;
the pixel defining layer covers the first groove to form a second groove; the display substrate has a cross section perpendicular to the base substrate; the concave structure comprises a first concave point and a second concave point within the cross section; orthographic projections of the first concave point and the second concave point on the base substrate are both within an orthographic projection of the second groove on the base substrate; and
within the cross section and along a first direction parallel to a plate surface of the base substrate, a distance L 1 between a first side surface, close to the first electrode, of the second groove and a first electrode edge, close to the first groove, of the first electrode is greater than a distance L 2 between the first concave point and the first side surface of the second groove;
the first electrode comprises a first surface and a second surface, and the second surface is closer to the base substrate than the first surface; a minimum distance from the first concave point to the base substrate is greater than a minimum distance from the first surface of the first electrode to the base substrate.
2 . The display substrate according to claim 1 , wherein the pixel defining layer comprises a first opening region and a second opening region, and a pixel defining portion between the first opening region and the second opening region; the first opening region exposes at least a portion of the first electrode, and the second opening region exposes at least a portion of the second electrode; and the pixel defining portion covers the first groove, a portion of the first electrode and a portion of the second electrode;
within the cross section and in the first direction, a portion of the pixel defining portion on the first surface of the first electrode has a length denoted by L 3 , and L 3 is less than L 1 .
3 . The display substrate according to claim 2 , wherein
within the cross section and in the first direction, a portion, which is on the second surface of the first electrode, of the pixel defining portion has a length denoted by L 4 , and L 2 is less than L 4 .
4 . The display substrate according to claim 3 , wherein L 3 is less than L 4 .
5 . The display substrate according to claim 2 , wherein within the cross section and in the first direction, a portion, which is on a side of the first side surface of the second groove close to the first electrode, of the pixel defining portion has a length denoted by y 1 , and the second groove has a maximum length denoted by L 5 ; and
y 1 is greater than L 5 .
6 . The display substrate according to claim 5 , wherein a distance between the first concave point and the second concave point in the first direction is less than y 1 .
7 . The display substrate according to claim 1 , wherein the pixel defining layer comprises a first surface away from the base substrate, the first surface of the pixel defining layer comprises a first inclined surface corresponding to the first electrode edge and a second inclined surface joined with the first side surface; shapes of the first inclined surface and the second inclined surface within the cross section both comprise a curve; and
the first surface of the pixel defining layer further comprises a connection surface between the first inclined surface and the second inclined surface, and the connection surface is flat at least in part.
8 . The display substrate according to claim 7 , wherein a ratio of a length of the connection surface within the cross section to L 1 is greater than ⅓.
9 . The display substrate according to claim 1 , wherein the second electrode layer comprises a protrusion portion which is at least partially overlapped with the first electrode in a direction perpendicular to the base substrate;
the protrusion portion has a first protrusion point within the cross section, and a protrusion height of the first protrusion point is greater than an average thickness of the second electrode layer.
10 . The display substrate according to claim 9 , wherein the first concave point and the second concave point have different distances to the base substrate;
the concave structure further comprises a second protrusion point within the cross section; the second protrusion point is between the first concave point and the second concave point; a distance of the second protrusion point to the base substrate is greater than a distance of each of the first concave point and the second concave point to the base substrate; and
a greater value of a height difference between the second protrusion point and the first concave point and a height difference between the second protrusion point and the second concave point is denoted by Δh.
11 . The display substrate according to claim 10 , wherein Δh is greater than a height difference between the first concave point and the second concave point.
12 . The display substrate according to claim 10 , wherein Δh is greater than the average thickness of the second electrode layer.
13 . The display substrate according to claim 10 , wherein Δh is greater than the protrusion height of the first protrusion point.
14 . The display substrate according to claim 10 , wherein the second groove comprises a third protrusion point within the cross section; and the third protrusion point is between the first concave point and the second concave point.
15 . The display substrate according to claim 1 , wherein within the cross section, a ratio of a maximum size of the second groove in a second direction perpendicular to the first direction to a maximum size of the second groove in the first direction is less than or equal to 0.5.
16 . The display substrate according to claim 1 , wherein within the cross section and in the first direction, the first electrode has a length denoted by f 1 , and a ratio of f 1 to L 1 ranges from 8 to 20.
17 . The display substrate according to claim 1 , wherein a distance between the first concave point and the second concave point in the first direction is denoted by y 2 ; and
a ratio of L 1 to y 2 is greater than ½.
18 . An electronic apparatus, comprising the display substrate according to claim 1 .
19 . A display substrate, comprising:
a base substrate comprising a first subpixel region and a second subpixel region adjacent to each other,
a dielectric layer located on the base substrate, and
a first electrode layer, a pixel defining layer, an organic functional layer and a second electrode layer which are stacked successively on a side, away from the base substrate, of the dielectric layer, the first electrode layer comprising a first electrode in the first subpixel region and a second electrode in the second subpixel region,
a gap is present between the first electrode and the second electrode; a portion, which is corresponding to the gap, of the dielectric layer comprises a first groove, and the gap exposes the first groove; a portion, which is corresponding to the first groove, of the second electrode layer comprises a concave structure;
the pixel defining layer covers the first groove to form a second groove; the display substrate has a cross section perpendicular to the base substrate; the concave structure comprises a first concave point and a second concave point within the cross section; orthographic projections of the first concave point and the second concave point on the base substrate are both within an orthographic projection of the second groove on the base substrate; and
within the cross section and along a first direction parallel to a plate surface of the base substrate, a distance L 1 between a first side surface, close to the first electrode, of the second groove and a first electrode edge, close to the first groove, of the first electrode is greater than a distance L 2 between the first concave point and the first side surface of the second groove;
the first electrode comprises a first surface and a second surface, and the second surface is closer to the base substrate than the first surface; a distance from the first concave point to the base substrate is greater than a distance from the first surface of the first electrode to the base substrate;
the first electrode comprises a first sub-electrode and a second sub-electrode that are stacked together, and the second sub-electrode is on a side, away from the dielectric layer, of the first sub-electrode; and
the second sub-electrode covers a side surface of the first sub-electrode and is in contact with the dielectric layer to form the second surface of the first electrode.