Organic light-emitting display panels, methods for making the same, and display devices

1. An organic light-emitting display panel, comprising:

an active region, and

a pixel spacer located within the active region, wherein the pixel spacer defines a plurality of buffer chambers, the plurality of the buffer chambers including a first buffer chamber, the pixel spacer configured to overlay a first top surface of the first buffer chamber completely and define the first buffer chamber, wherein the first buffer chamber is an enclosed volume defined by one or more of the pixel spacer and a base substrate, and wherein at least two of the plurality of the buffer chambers, including the first buffer chamber, are arranged along a direction perpendicular to a displaying surface of the organic light-emitting display panel.

2. The organic light-emitting display panel of claim 1 , further comprising the base substrate located at a side of the pixel spacer, wherein the first buffer chamber is located adjacent to the base substrate.

3. The organic light-emitting display panel of claim 2 , wherein a ratio of an area of a projection of the plurality of the buffer chambers on the base substrate to an area of a projection of the pixel spacer on the base substrate is in a range from 1:1 to 1:50.

4. The organic light-emitting display panel of claim 1 , further comprising a plurality of sub-pixels;

wherein each of the plurality of sub-pixels is surrounded by the pixel spacer, and the plurality of the buffer chambers are located between any two adjacent sub-pixels.

5. The organic light-emitting display panel of claim 4 , wherein upper ends of the plurality of the buffer chambers are coplanar with each other, and lower ends of the plurality of the buffer chambers are coplanar with each other.

6. The organic light-emitting display panel of claim 1 , wherein the plurality of the buffer chambers include an arched, trapezoidal, circular, or rectangular cross-section perpendicular to an upper surface of the pixel spacer.

7. The organic light-emitting display panel of claim 1 , comprising a flexible filler or an inert gas filled in the plurality of the buffer chambers, the plurality of the buffer chambers being configured outside display pixels.

8. The organic light-emitting display panel of claim 7 , wherein a material of the flexible filler is a silica gel or a liquid insulating material unable to react with a layer or a film surrounding the flexible filler.

9. The organic light-emitting display panel of claim 7 , wherein the inert gas is helium gas, argon gas, or a combination thereof.

10. The organic light-emitting display panel of claim 1 , wherein the plurality of the buffer chambers are enclosed within the pixel spacer.

11. The organic light-emitting display panel of claim 1 , wherein the plurality of the buffer chambers includes a chamber with an open end, wherein at least part of the chamber with the open end is not defined by the pixel spacer.

12. The organic light-emitting display panel of claim 11 , wherein the plurality of the buffer chambers are arranged on a surface of the pixel spacer and has a recess shape.

13. The organic light-emitting display panel of claim 1 , wherein a region of the pixel spacer located around the first buffer chamber has a bridge shape.

14. The organic light-emitting display panel of claim 1 wherein the plurality of buffer chambers further comprises a second buffer chamber, the second buffer chamber aligned relative to the first buffer chamber, the pixel spacer overlaying a bottom surface of the second buffer chamber.

15. The organic light-emitting display panel of claim 1 wherein the plurality of buffer chambers further comprises a second buffer chamber, the second buffer chamber aligned relative to the first buffer chamber, the pixel spacer overlaying a second top surface of the second buffer chamber.

16. A method for making an organic light-emitting display panel, comprising:

forming a patterned embankment on a substrate within an active region of the organic light-emitting display;

forming a pixel spacer on the substrate formed with the patterned embankment, wherein the pixel spacer is within the active region of the organic light-emitting display panel; and

forming a buffer chamber on the pixel spacer, wherein forming the buffer chamber further comprises removing a portion of the patterned embankment to form the buffer chamber, a top surface of the buffer chamber being covered completely and defined by the pixel spacer, wherein the buffer chamber is an enclosed volume defined by one or more of the pixel spacer and a base substrate.

17. A display device, comprising an organic light-emitting display panel, wherein the organic light-emitting display panel comprises an active region and a pixel spacer located within the active region, wherein the pixel spacer defines a plurality of buffer chambers, the plurality of buffer chambers including a first buffer chamber, the pixel spacer configured to overlay a first top surface of the first buffer chamber completely and define the first buffer chamber, wherein the first buffer chamber is an enclosed volume defined by one or more of the pixel spacer and a base substrate, and wherein at least two of the plurality of buffer chambers, including the first buffer chamber, are arranged along a direction perpendicular to a displaying surface of the organic light-emitting display panel.