Display panel including ring-shaped retaining walls, display device, display panel, and manufacturing method thereof

1. A display panel, comprising an opening area, a peripheral area surrounding at least a part of the opening area, and a display area, wherein the display panel further comprises:

a thin film transistor substrate;

a plurality of ring-shaped retaining walls disposed on a part of the thin film transistor substrate corresponding to the peripheral area, and disposed around the opening area, wherein each of the ring-shaped retaining walls is provided with one or more openings, ring-shaped grooves are defined between adjacent ones of the ring-shaped retaining walls, and the ring-shaped retaining walls and the ring-shaped grooves are communicating with each other through the openings; and

a filling layer disposed in the peripheral area,

wherein all of the ring-shaped grooves have a same depth.

2. The display panel according to claim 1 , wherein the ring-shaped retaining walls comprise:

a first ring-shaped retaining wall comprising at least one first opening and surrounding the opening area; and

a second ring-shaped retaining wall comprising at least one second opening and surrounding the first ring-shaped retaining wall,

wherein at least a part of the second opening corresponds to the first opening, or the second opening and the first opening are staggered to each other.

3. The display panel according to claim 1 , wherein the ring-shaped retaining walls have a T-shaped cross-section.

4. The display panel according to claim 1 , wherein an angle formed between an inclined surface of each of the ring-shaped grooves and a vertical direction of each of the ring-shaped grooves is greater than 90 degrees and less than 180 degrees.

5. The display panel according to claim 1 , wherein the thin film transistor substrate comprises:

a substrate;

a buffer layer disposed on the substrate;

a switch component disposed in the display area and comprising an active layer, a first gate, a source, and a drain;

an insulating layer disposed in the display area and the peripheral area and at least comprising a first gate insulating layer and an interlayer insulating layer which are disposed on the active layer; and

a passivation layer covering the insulating layer.

6. The display panel according to claim 5 , wherein the ring-shaped retaining walls are formed by patterning the passivation layer and the insulating layer.

7. The display panel according to claim 1 , wherein a ratio of a circumference of each of the ring-shaped retaining walls to an arc length of the openings on the ring-shaped retaining walls is between 10 to 50.

8. The display panel according to claim 1 , wherein a number of rings of the ring-shaped retaining walls is greater than or equal to 5.