Display panel, packaging method thereof and OLED display apparatus

1. A packaging method of a display panel, the method comprising:

forming a dam on a first substrate provided with a component to be packaged, wherein the dam annularly surrounds the component to be packaged, and an intersection angle between an inner side surface of the dam and an upper surface of the first substrate is an acute angle;

filling a region surrounded by the dam with a curable liquid; and

aligning and assembling a second substrate with the first substrate on which the dam is formed,

wherein a value of the acute angle is related to a material of the curable liquid, such that a climbing extent of the curable liquid up the inner side surface of the dam is limited to a predetermined amount based on the value of the acute angle and the material of the curable liquid.

2. The packaging method of claim 1 , further comprising: curing the curable liquid before or after the step of aligning and assembling the second substrate with the first substrate on which the dam is formed.

3. The packaging method of claim 1 , further comprising: forming a package film on the first substrate provided with the component to be packaged to cover the component to be packaged before the step of forming the dam on the first substrate provided with the component to be packaged.

4. The packaging method of claim 3 , wherein the step of forming the dam on the first substrate provided with the component to be packaged comprises:

coating the first substrate, on which the packaging film is formed, with a photoresist;

exposing and developing the photoresist to form a recessed region in the photoresist, wherein the recessed region surrounds annularly the component to be packaged, and an intersection angle between the upper surface of the first substrate and an inner side surface of the recessed region close to the component to be packaged is the acute angle;

filling the recessed region with a liquid adhesive and curing the liquid adhesive to form the dam; and

removing the photoresist on the first substrate.

5. The packaging method of claim 4 , wherein the recessed region has a cross section of an inverted trapezoidal shape in a direction which is perpendicular to both the upper surface of the first substrate and the inner side surface of the recessed region.

6. A display panel comprising:

a first substrate provided with a component to be packaged;

a dam on the first substrate, the dam annularly surrounding the component to be packaged; and

a filler in a region surrounded by the dam,

wherein the dam has an inner side surface and an outer side surface, the inner side surface being closer to the component to be packaged than the outer side surface; and

wherein an intersection angle between the inner side surface of the dam and an upper surface of the first substrate is an acute angle, and a value of the acute angle is related to a material of the filler, such that a climbing extent of the filler up the inner side surface of the dam is limited to a predetermined amount based on the value of the acute angle and the material of the filler.

7. The display panel of claim 6 , further comprising a package film disposed on the first substrate and covering the component to be packaged.

8. The display panel of claim 6 , wherein a cross section of the dam in a direction perpendicular to both the upper surface of the first substrate and the inner side surface of the dam has an inverted trapezoidal shape.

9. The display panel of claim 6 , wherein the dam comprises a cured liquid adhesive.

10. The display panel of claim 6 , wherein the filler comprises a cured transparent liquid adhesive.

11. The display panel of claim 10 , wherein the transparent liquid adhesive is a UV-curable adhesive or a heat-curable adhesive.

12. The display panel of claim 10 , wherein a viscosity of the liquid adhesive of the dam is larger than a viscosity of the transparent liquid adhesive of the filler.

13. The display panel of claim 6 , wherein the dam and the filler comprise epoxy resin or hexamethyldisiloxane.

14. The display panel of claim 13 , wherein a content of the epoxy resin in the dam is larger than a content of the epoxy resin in the filler.

15. The display panel of claim 6 , wherein the filler is formed of a curable hydrophobic liquid.

16. The display panel of claim 7 , further comprising a second substrate aligned and assembled with the first substrate,

wherein the second substrate together with the dam and the first substrate enclose a closed cavity, both the component to be packaged and the package film are located in the closed cavity, and a remaining region of the closed cavity is filled with the filler.

17. An OLED display apparatus comprising the display panel of claim 6 , wherein the component to be packaged is an OLED display device.

18. The OLED display apparatus of claim 17 , further comprising: a package film on the first substrate and covering the component to be packaged.

19. The OLED display apparatus of claim 17 , wherein a cross section of the dam in a direction perpendicular to both the upper surface of the first substrate and the inner side surface of the dam has an inverted trapezoidal shape.