Display panel
View Patent ↗A display panel includes a first display area. The first display area includes a display substrate and an optical layer. The display substrate includes a pixel defining layer and a cathode layer disposed on the pixel defining layer. The pixel defining layer includes a plurality of pixel openings and a plurality of supporting portions each disposed between two adjacent pixel openings. A thickness of a part of the cathode layer on each of the pixel opening is greater than a thickness of a part of the cathode layer on each of the supporting portions. The optical layer is disposed on the cathode layer and includes a plurality of first optical structures corresponding to the supporting portions. Each of the first optical structures includes a first surface close to the cathode layer, a second surface opposite to the first surface, and a side surface that is a total reflective surface.
1. A display panel, comprising
a first display area and a second display area surrounding the first display area, wherein a light transmittance of the first display area is greater than a light transmittance of the second display area, and the first display area comprises:
a display substrate comprising a pixel defining layer and a cathode layer disposed on the pixel defining layer, wherein the pixel defining layer comprises a plurality of pixel openings spaced apart from each other and a plurality of supporting portions each disposed between two adjacent pixel openings; and
an optical layer disposed on a side of the cathode layer away from the pixel defining layer, and comprising a plurality of first optical structures corresponding to the supporting portions, wherein each of the first optical structures comprises a first surface close to the cathode layer, a second surface opposite to the first surface, and a side surface that is a total reflective surface;
wherein the optical layer further comprises at least two optical sub-layers with different refractive indices, and at least one of the at least two optical sub-layers forms the first optical structures;
wherein the refractive indices of the at least two optical sub-layers decrease sequentially from a side close to the display substrate to a side away from the display substrate, and a width of the second surfaces of the first optical structures is greater than or equal to a width of the first surfaces of the first optical structures; and
wherein the optical layer further comprises a plurality of second optical structures corresponding to the pixel openings, the second optical structures are disposed in a same layer as the first optical structures, and each of the second optical structures comprises a first surface close to the cathode layer, a second surface opposite to the first surface, and a side surface that is a total reflective surface.
2. The display panel according to claim 1 , wherein
a width of the second surfaces of the second optical structures is greater than or equal to a width of the first surfaces of the second optical structures.
3. The display panel according to claim 2 , wherein
the first optical structures or the second optical structures comprise at least two of the at least two optical sub-layers, one optical sub-layer on the side away from the display substrate covers one optical sub-layer on the side close to the display substrate, and the at least two optical sub-layers in the first optical structures or the second optical structures have a same cross-sectional shape in a direction perpendicular to the display substrate.
4. The display panel according to claim 2 , wherein
the cathode layer comprises a plurality of first cathode portions corresponding to the pixel openings and a plurality of second cathode portions corresponding to the supporting portions, and a thickness of the first cathode portions is greater than a thickness of the second cathode portions.
5. The display panel according to claim 4 , wherein
the display substrate further comprises:
a plurality of anode electrodes disposed corresponding to the first cathode portions;
a first auxiliary layer disposed on a side of each of the anode electrodes close to the cathode layer;
an organic light-emitting layer disposed on a side of the first auxiliary layer close to the cathode layer;
a second auxiliary layer disposed on a side of the organic light-emitting layer close to the cathode layer; and
a cathode suppression layer disposed on each of the supporting portions, wherein a thickness of the cathode suppression layer is less than a thickness of the cathode layer, an adhesion force between the cathode suppression layer and the cathode layer is less than an adhesion force between the cathode layer and the second auxiliary layer, and the cathode suppression layer is made of a transparent material.
6. The display panel according to claim 5 , wherein
an orthographic projection of the cathode suppression layers on the optical layer is separated from an orthographic projection of the anode electrodes on the optical layer.
7. The display panel according to claim 5 , wherein
an orthographic projection of the first optical structures on the display substrate overlaps with the cathode suppression layers.
8. The display panel according to claim 7 , wherein
a boundary of the first surface of each of the first optical structures corresponds to a boundary of one corresponding cathode suppression layer.
9. The display panel according to claim 4 , wherein
an orthographic projection of the second optical structures on the display substrate overlaps with the first cathode portions.
10. The display panel according to claim 4 , wherein
a width of the pixel openings is L, a height of the pixel openings is H, an included angle between the side surface and the first surface of each of the first optical structures is a first included angle, an included angle between the side surface and the first surface of each of the second optical structures is a second included angle, the first included angle and the second included angle are both greater than a threshold angle and less than or equal to 90°, and the threshold angle is arctan (H/L)*180°/T.
11. The display panel according to claim 10 , wherein
the first included angle is equal to the second included angle.
12. The display panel according to claim 10 , wherein
a boundary of the first surface of each of the second optical structures is located between a boundary of one corresponding pixel opening and a boundary beyond the boundary of the corresponding pixel opening by a predetermined distance, and the predetermined distance is a vertical distance from the pixel defining layer to the optical layer divided by a tangent value of the threshold angle.
13. The display panel according to claim 1 , wherein
the refractive indices of the at least two optical sub-layers increase sequentially from a side of the optical layer close to the display substrate to a side of the optical layer away from the display substrate, and a width of the second surfaces of the first optical structures is less than or equal to a width of the first surfaces of the first optical structures.
14. The display panel according to claim 13 , wherein
the cathode layer comprises a plurality of first cathode portions corresponding to the pixel openings and a plurality of second cathode portions disposed on the supporting portions, and a thickness of the first cathode portions is greater than a thickness of the second cathode portions.
15. The display panel according to claim 14 , wherein
the display substrate further comprises:
a plurality of anode electrodes disposed corresponding to the first cathode portions;
a first auxiliary layer disposed on a side of each of the anode electrodes close to the cathode layer;
an organic light-emitting layer disposed on a side of the first auxiliary layer close to the cathode layer;
a second auxiliary layer disposed on a side of the organic light-emitting layer close to the cathode layer; and
a cathode suppression layer disposed on each of the supporting portions, wherein a thickness of the cathode suppression layer is less than a thickness of the cathode layer, an adhesion force between the cathode suppression layer and the cathode layer is less than an adhesion force between the cathode layer and the second auxiliary layer, and the cathode suppression layer is made of a transparent material.
16. The display panel according to claim 15 , wherein
the first display area further comprises a plurality of light-transmitting areas each disposed between two adjacent pixel openings, an orthographic projection of each of the first optical structures on the display substrate is located between one of the pixel openings and one of the light-transmitting areas.
17. The display panel according to claim 16 , wherein
a side of the first surface of each of the first optical structures close to one adjacent pixel opening corresponds to a side of the adjacent pixel opening, and a side of the first surface of each of the first optical structures close to one adjacent light-transmitting area corresponds to a side of the adjacent cathode suppression layer.