Display panel, manufacturing method thereof, and display device

1 . A display panel, comprising:

a substrate;

a thin film transistor layer disposed on the substrate;

a first electrode layer disposed on the thin film transistor layer and comprising a plurality of anodes, and a plurality of auxiliary cathodes, the plurality of anodes and the plurality of auxiliary cathodes being arranged on a same layer;

a pixel definition layer disposed on the thin film transistor layer and comprising a plurality of first openings corresponding to each of the anodes one by one and a plurality of second openings corresponding to each of the auxiliary cathodes one by one;

an organic light-emitting layer at least disposed on the first electrode layer corresponding to the first openings and the second openings; and

a second electrode layer disposed on the organic light-emitting layer, and

wherein one of first protection electrodes located on the thin film transistor layer is disposed between one of the anodes and the pixel definition layer, one of the first protection electrodes is disposed around a peripheral side of one of the anodes, one of the first protection electrodes comprises a vertical portion connected to a lateral side of one of the anodes and a horizontal portion horizontally extending in a direction from the vertical portion to one of the first openings, the horizontal portion is at least partially disposed on the anode;

wherein one of second protection electrodes located on the thin film transistor layer is disposed between one of the auxiliary cathodes and the pixel definition layer, one of the second protection electrodes is disposed around a peripheral side of one of the auxiliary cathodes, and an undercut opening located between the pixel definition layer and one of the auxiliary cathodes is defined on a lateral wall of one of the second openings; and

wherein the undercut opening is defined corresponding to one of the second protection electrodes, the second electrode layer is disposed on the pixel definition layer and the auxiliary cathodes, and the second electrode layer penetrates through the undercut openings and is electrically connected to the second protection electrodes.

2 . The display panel as claimed in claim 1 , wherein one of the anodes or the auxiliary electrodes comprises an electrode body disposed on the thin film transistor layer and an oxidation protection sub-layer disposed on the electrode body;

in one of the anodes or the auxiliary electrodes and one corresponding first protection electrode or second protection electrode, the first protection electrode or second protection electrode and the oxidation protection sub-layer are connected to form a protection cavity, and the electrode body is disposed in the protection cavity.

3 . The display panel as claimed in claim 2 , wherein

the vertical portion is disposed on the thin film transistor layer and connected to a lateral side of the oxidation protection sub-layer, and

the horizontal portion is at least partially disposed on the oxidation protection sub-layer.

4 . The display panel as claimed in claim 3 , wherein a thickness of the horizontal portion is less than a thickness of the organic light-emitting layer in a direction perpendicular to the substrate.

5 . The display panel as claimed in claim 3 , wherein

the organic light-emitting layer comprises a first sub-section disposed on the pixel definition layer and a second sub-section disposed on the auxiliary cathodes, the first sub-section and the second sub-section are spaced apart, and

the second electrode layer is disposed on the first sub-section, the second sub-section, and the auxiliary cathodes, and is connected to the auxiliary cathodes.

6 . The display panel as claimed in claim 5 , wherein a thickness of one of the second protection electrodes is greater than a thickness of one of the auxiliary cathodes in a direction perpendicular to the substrate, and the second electrode layer is disposed on the first sub-section, the second sub-section, and the auxiliary cathodes.

7 . The display panel as claimed in claim 6 , wherein one of the second protection electrodes comprise a protection segment disposed on the thin film transistor layer and a connection segment extending from the protection segment to a side away from the thin film transistor layer, the protection segment is connected to a lateral side of the oxidation protection sub-layer of one of the auxiliary cathodes, the undercut opening is defined corresponding to the connection segment, and the second electrode layer penetrates through the undercut opening and is electrically connected to the connection segment.

8 . The display panel as claimed in claim 5 , wherein a depth of the undercut opening ranges from 2 μm to 5 μm in a direction parallel to the substrate.

9 . The display panel as claimed in claim 1 , wherein a material of the first protection electrodes or the second protection electrodes comprises at least one of an alloy of molybdenum and titanium or titanium.

10 . A manufacturing method of a display panel, comprising following steps:

providing a substrate; forming a thin film transistor layer on the substrate;

forming a first electrode layer and protection electrodes on the thin film transistor layer, wherein the first electrode layer comprises a plurality of anodes and a plurality of auxiliary cathodes, the plurality of anodes and the plurality of auxiliary cathodes being arranged on a same layer, the protection electrodes comprise a plurality of first protection electrodes and a plurality of second protection electrodes, one of the first protection electrodes is disposed around a peripheral side of one of the anodes, and one of the second protection electrodes is disposed around a peripheral side of one of the auxiliary cathodes;

forming a pixel definition layer on the thin film transistor layer, wherein a plurality of first openings corresponding to each of the anodes one by one and a plurality of second openings corresponding to each of the auxiliary cathodes one by one are formed in the pixel definition layer, one of the first protection electrodes located on the thin film transistor layer is disposed between one of the anodes and the pixel definition layer, and one of the second protection electrodes located on the thin film transistor layer is disposed between one of the auxiliary cathodes and the pixel definition layer;

at least forming an organic light-emitting layer on the first electrode layer;

forming a second electrode layer on the organic light-emitting layer; and

forming an undercut opening on a lateral wall of one of the second openings, wherein the undercut opening is located between the pixel definition layer and one of the auxiliary cathodes; and

wherein one of the first protection electrodes comprise a vertical portion connected to a lateral side of one of the anodes and a horizontal portion horizontally extending in a direction from the vertical portion to one of the first openings, the horizontal portion is at least partially disposed on the anode, the undercut opening is defined corresponding to one of the second protection electrodes, the second electrode layer is disposed on the pixel definition layer and the auxiliary cathodes, and the second electrode layer penetrates through the undercut openings and is electrically connected to the second protection electrodes.

11 . A display device, wherein the display device comprises a display panel, and the display panel comprises:

a substrate;

a thin film transistor layer disposed on the substrate;

a first electrode layer disposed on the thin film transistor layer and comprising a plurality of anodes, and a plurality of auxiliary cathodes, the plurality of anodes and the plurality of auxiliary cathodes being arranged on a same layer;

a pixel definition layer disposed on the thin film transistor layer and comprising a plurality of first openings corresponding to each of the anodes one by one and a plurality of second openings corresponding to each of the auxiliary cathodes one by one;

an organic light-emitting layer at least disposed on the first electrode layer corresponding to the first openings and the second openings; and

a second electrode layer disposed on the organic light-emitting layer, and

wherein one of first protection electrodes located on the thin film transistor layer is disposed between one of the anodes and the pixel definition layer, one of the first protection electrodes is disposed around a peripheral side of one of the anodes, one of the first protection electrodes comprises a vertical portion connected to a lateral side of one of the anodes and a horizontal portion horizontally extending in a direction from the vertical portion to one of the first openings, the horizontal portion is at least partially disposed on the anode;

wherein one of second protection electrodes located on the thin film transistor layer is disposed between one of the auxiliary cathodes and the pixel definition layer, one of the second protection electrodes is disposed around a peripheral side of one of the auxiliary cathodes, and an undercut opening located between the pixel definition layer and one of the auxiliary cathodes is defined on a lateral wall of one of the second openings; and

wherein the undercut opening is defined corresponding to one of the second protection electrodes, the second electrode layer is disposed on the pixel definition layer and the auxiliary cathodes, and the second electrode layer penetrates through the undercut openings and is electrically connected to the second protection electrodes.

12 . The display device as claimed in claim 11 , wherein one of the anodes or the auxiliary electrodes comprises an electrode body disposed on the thin film transistor layer and an oxidation protection sub-layer disposed on the electrode body;

in one of the anodes or the auxiliary electrodes and one corresponding first protection electrode or second protection electrode, the first protection electrode or second protection electrode and the oxidation protection sub-layer are connected to form a protection cavity, and the electrode body is disposed in the protection cavity.

13 . The display device as claimed in claim 12 , wherein,

the vertical portion is disposed on the thin film transistor layer and connected to a lateral side of the oxidation protection sub-layer, and

the horizontal portion is at least partially disposed on the oxidation protection sub-layer.

14 . The display device as claimed in claim 13 , wherein a thickness of the horizontal portion is less than a thickness of the organic light-emitting layer in a direction perpendicular to the substrate.

15 . The display device as claimed in claim 13 , wherein

the organic light-emitting layer comprises a first sub-section disposed on the pixel definition layer and a second sub-section disposed on the auxiliary cathodes, the first sub-section and the second sub-section are spaced apart, and the second electrode layer is disposed on the first sub-section, the second sub-section, and the auxiliary cathodes, and is connected to the auxiliary cathodes.

16 . The display device as claimed in claim 15 , wherein a thickness of one of the second protection electrodes is greater than a thickness of one of the auxiliary cathodes in a direction perpendicular to the substrate, and the second electrode layer is disposed on the first sub-section, the second sub-section, and the auxiliary cathodes.

17 . The display device as claimed in claim 16 , wherein one of the second protection electrodes comprise a protection segment disposed on the thin film transistor layer and a connection segment extending from the protection segment to a side away from the thin film transistor layer, the protection segment is connected to a lateral side of the oxidation protection sub-layer of one of the auxiliary cathodes, the undercut opening is defined corresponding to the connection segment, and the second electrode layer penetrates through the undercut opening and is electrically connected to the connection segment.

18 . The display device as claimed in claim 15 , wherein a depth of the undercut opening ranges from 2 μm to 5 μm in a direction parallel to the substrate.

19 . The display device as claimed in claim 11 , wherein a material of the first protection electrodes or the second protection electrodes comprises at least one of an alloy of molybdenum and titanium or titanium.