Organic light-emitting diode display panel and manufacturing method thereof and display device
The present disclosure discloses an organic light-emitting diode display panel and a manufacturing method thereof and a display device, and relates to the field of display technologies. The organic light-emitting diode display panel comprises: a base substrate; a pixel defining layer and a plurality of first electrodes on the base substrate, wherein the pixel defining layer defines, on the base substrate, a plurality of sub-pixel regions arranged in an array, one of the first electrodes is located in each of the sub-pixel regions, and the work function of a middle portion of the first electrode is less than the work function of a peripheral portion; an organic light-emitting layer on each of the first electrodes; and a second electrode electrically connected to the organic light-emitting layer, wherein the first electrode is an anode and the second electrode is a cathode.
1. An organic light-emitting diode display panel, comprising:
a base substrate;
a pixel defining layer and a plurality of first electrodes on the base substrate, wherein the pixel defining layer defines, on the base substrate, a plurality of sub-pixel regions arranged in an array, one of the first electrodes is formed in each of the sub-pixel regions, wherein each of the plurality of first electrodes comprises a center sub-electrode, and at least one ring-shaped sub-electrode each surrounding the center sub-electrode in a nested manner; the center sub-electrode and the at least one ring-shaped sub-electrode are arranged on a same layer; and a work function of any sub-electrode closer to the center sub-electrode is lower than a work function of any sub-electrode further away from the center sub-electrode;
an organic light-emitting layer on each of the first electrodes; and
a second electrode electrically connected to the organic light-emitting layer, wherein the first electrode is an anode and the second electrode is a cathode.
2. The organic light-emitting diode display panel according to claim 1 , wherein the first electrode is made of a transparent conductive material.
3. The organic light-emitting diode display panel according to claim 2 , wherein a material of the center sub-electrode comprises any of indium tin oxide and zinc oxide; and
a material of comprises any of indium zinc oxide and aluminum-doped zinc oxide.
4. The organic light-emitting diode display panel according to claim 1 , wherein the number of the ring-shaped sub-electrode in the first electrode is one, and
wherein a work function of the ring-shaped sub-electrode is higher than a work function of the center sub-electrode.
5. The organic light-emitting diode display panel according to claim 4 , wherein the ring-shaped sub-electrode has a width of 3-10 microns.
6. The organic light-emitting diode display panel according to claim 1 , wherein the first electrode meets at least one of the followings:
the center sub-electrode is rectangular and the ring-shaped sub-electrode is square ring-shaped; and
a thickness of the center sub-electrode is greater than that of the ring-shaped sub-electrode.
7. The organic light-emitting diode display panel according to claim 1 , wherein
the center sub-electrode is rectangular and the ring-shaped sub-electrode is square ring-shaped;
a material of the center sub-electrode comprises any of indium tin oxide and zinc oxide; and
a material of the ring-shaped sub-electrode comprises any of indium zinc oxide and aluminum-doped zinc oxide.
8. A method for manufacturing an organic light-emitting diode display panel, comprising:
forming a pixel defining layer and a plurality of first electrodes on a base substrate, wherein the pixel defining layer defines, on the base substrate, a plurality of sub-pixel regions arranged in an array, one of the first electrodes is formed in each of the sub-pixel regions, wherein each of the plurality of first electrodes comprises a center sub-electrode, and at least one ring-shaped sub-electrode each surrounding the center sub-electrode in a nested manner; the center sub-electrode and the at least one ring-shaped sub-electrode are arranged on a same layer; and a work function of any sub-electrode closer to the center sub-electrode is lower than a work function of any sub-electrode further away from the center sub-electrode;
forming an organic light-emitting layer on each of the first electrodes; and
forming, on the base substrate on which the organic light-emitting layer has been formed, a second electrode electrically connected to the organic light-emitting layer, wherein the first electrode is an anode and the second electrode is a cathode.
9. The method according to claim 8 , wherein the forming a pixel defining layer and a plurality of first electrodes on a base substrate comprises:
forming the plurality of first electrodes on the base substrate; and
forming the pixel defining layer on the base substrate on which the plurality of first electrodes have been formed.
10. The method according to claim 8 , wherein the forming a pixel defining layer and a plurality of first electrodes on a base substrate comprises:
forming the pixel defining layer on the base substrate; and
forming the plurality of first electrodes on the base substrate on which the pixel defining layer has been formed.
11. The method according to claim 8 , wherein the first electrode is made of a transparent conductive material.
12. The method according to claim 11 , wherein a material of the center sub-electrode comprises any of indium tin oxide and zinc oxide; and
a material of the ring-shaped sub-electrode comprises any of indium zinc oxide and aluminum-doped zinc oxide.
13. The method according to claim 8 , wherein the number of the ring-shaped sub-electrode in the first electrode is one, and
wherein a work function of the ring-shaped sub-electrode is higher than a work function of the center sub-electrode.
14. The method according to claim 13 , the forming process of the plurality of first electrodes comprises:
forming a first sub-electrode material layer on the base substrate;
forming a first photoresist layer on the first sub-electrode material layer;
exposing, developing and etching the first sub-electrode material layer on which the first photoresist layer has been formed, to obtain a first sub-electrode pattern with a first photoresist pattern, wherein the first sub-electrode pattern comprises the plurality of first sub-electrodes;
forming a second sub-electrode material layer on the base substrate, wherein the second sub-electrode material layer covers the first sub-electrode pattern with the first photoresist pattern;
forming a second photoresist layer on the second sub-electrode material layer;
exposing, developing and etching the second sub-electrode material layer on which the second photoresist layer has been formed, to obtain a second sub-electrode pattern with a second photoresist pattern, wherein the second sub-electrode pattern comprises the plurality of second sub-electrodes; and
peeling off the first photoresist pattern and the second photoresist pattern to obtain the first electrode, wherein
the first sub-electrode and the second sub-electrode are the center sub-electrode/the ring-shaped sub-electrode or the ring-shaped sub-electrode/the center sub-electrode.
15. The method according to claim 8 , wherein the ring-shaped sub-electrode has a width of 3-10 microns.
16. The method according to claim 8 , wherein the first electrode meets at least one of the followings:
the center sub-electrode is rectangular and the ring-shaped sub-electrode is square ring-shaped; and
a thickness of the center sub-electrode is greater than that of the ring-shaped sub-electrode.
17. A display device, comprising an organic light-emitting diode display panel, and the display panel comprising:
a base substrate;
a pixel defining layer and a plurality of first electrodes on the base substrate, wherein the pixel defining layer defines, on the base substrate, a plurality of sub-pixel regions arranged in an array, one of the first electrodes is formed in each of the sub-pixel regions, wherein each of the plurality of first electrodes comprises a center sub-electrode, and at least one ring-shaped sub-electrode each surrounding the center sub-electrode in a nested manner; the center sub-electrode and the at least one ring-shaped sub-electrode are arranged on a same layer; and a work function of any sub-electrode closer to the center sub-electrode is lower than a work function of any sub-electrode further away from the center sub-electrode;
an organic light-emitting layer on each of the first electrodes; and
a second electrode electrically connected to the organic light-emitting layer, wherein the first electrode is an anode and the second electrode is a cathode.
18. The display device according to claim 17 , wherein
the center sub-electrode is rectangular and the ring-shaped sub-electrode is square ring-shaped;
a material of the center sub-electrode comprises any of indium tin oxide and zinc oxide; and
a material of the ring-shaped sub-electrode comprises any of indium zinc oxide and aluminum-doped zinc oxide.