Organic light-emitting diode display panel

1. An organic light-emitting diode (OLED) display panel, comprising a substrate, an OLED light-emitting layer disposed on a surface of the substrate, and a thin film encapsulation layer disposed on a surface of the OLED light-emitting layer; wherein

a display area of the OLED display panel is formed with a via hole and a water blocking structure for protecting the via hole from water vapor, the water blocking structure comprises:

a trench defined in the surface of the substrate, the trench disposed around the via hole; and

a baffle wall formed in the trench and protruding from the surface of the OLED light-emitting layer; wherein a contour shape of the baffle wall is a same as a contour shape of the via hole, and the via hole is located at a center of the contour of the baffle wall;

the thin film encapsulation layer comprises a water blocking layer and a stress buffer layer which are stacked on each other, and an edge of an opening of the water blocking layer is aligned with an edge of the via hole, and the stress buffer layer is formed outside the baffle wall;

wherein the water blocking structure comprises a first sub-trench and a second sub-trench, the first sub-trench being disposed around the via hole, the second sub-trench being disposed around the first sub-trench; and

a first sub-baffle wall is disposed in the first sub-trench, and a second sub-baffle wall is disposed in the second sub-trench.

2. The OLED display panel of claim 1 , wherein an inner wall of the trench is inclined or curved toward a center of the trench.

3. The OLED display panel of claim 2 , wherein a height of the first sub-baffle wall is greater than a height of the second sub-baffle wall.

4. The OLED display panel of claim 3 , wherein the stress buffer layer is formed outside the second sub-baffle wall.

5. The OLED display panel according to claim 3 , wherein the stress buffer layer is formed outside the first sub-baffle wall and covers the second sub-baffle wall.

6. The OLED display panel according to claim 1 , wherein the baffle wall is made of a curable liquid moisture absorbent or an organic material doped with moisture absorbing particles.

7. The OLED display panel according to claim 1 , wherein the surface of the substrate is further provided with a crack arresting member, and the crack arresting member is disposed around the via hole, and located between the baffle wall and the via hole.

8. The OLED display panel of claim 1 , wherein the contour shape of the via hole is a regular planar pattern or an irregular planar pattern.

9. The OLED display panel according to claim 8 , wherein the via hole is located at a position close to an edge of the OLED panel, or the via hole is integrally defined by the edge of the OLED panel.

10. An organic light-emitting diode (OLED) display panel, comprising a substrate, an OLED light-emitting layer disposed on a surface of the substrate, and a thin film encapsulation layer disposed on a surface of the OLED light-emitting layer; wherein

a display area of the OLED display panel is formed with a via hole and a water blocking structure for protecting the via hole from water vapor, and the water blocking structure comprises:

a trench defined in the surface of the substrate, the trench being disposed around the via hole; and

a baffle wall formed in the trench and protruding from the surface of the OLED light-emitting layer; wherein

the thin film encapsulation layer comprises a water blocking layer and a stress buffer layer which are stacked on each other, and an edge of an opening of the water blocking layer is aligned with an edge of the via hole, and the stress buffer layer is formed outside the baffle wall;

wherein the water blocking structure comprises a first sub-trench and a second sub-trench, the first sub-trench being disposed around the via hole, the second sub-trench being disposed around the first sub-trench; and

a first sub-baffle wall is disposed in the first sub-trench, while a second sub-baffle wall is disposed in the second sub-trench.

11. The OLED display panel of claim 10 , wherein an inner wall of the trench is inclined or curved toward a center of the trench.

12. The OLED display panel of claim 11 , wherein a height of the first sub-baffle wall is greater than a height of the second sub-baffle wall.

13. The OLED display panel of claim 12 , wherein the stress buffer layer is formed outside the second sub-baffle wall.

14. The OLED display panel according to claim 12 , wherein the stress buffer layer is formed outside the first sub-baffle wall and covers the second sub-baffle wall.

15. The OLED display panel according to claim 10 , wherein the baffle wall is made of a curable liquid moisture absorbent or an organic material doped with moisture absorbing particles.

16. The OLED display panel according to claim 10 , wherein the surface of the substrate is further provided with a crack arresting member, and the crack arresting member is disposed around the via hole, and located between the baffle wall and the via hole.

17. The OLED display panel of claim 10 , wherein the contour shape of the via hole is a regular planar pattern or an irregular planar pattern.

18. The OLED display panel according to claim 17 , wherein the via hole is located at a position close to an edge of the OLED panel, or the via hole is integrally defined by the edge of the OLED panel.