Display panel comprising a container portion extends along a length of a row of subpixel regions having grooves connect to subpixel regions of a same color and a method thereof

1. A display panel comprising:

a base substrate;

a pixel-defining layer on a surface on the base substrate to define multiple subpixel regions arranged in multiple rows with each subpixel region surrounded by part of the pixel-defining layer;

wherein the pixel-defining layer includes one or more grooves, each groove including a container portion partially surrounded by an edge portion, the container portion being at a first height above the surface and the edge portion being at a second height greater than the first height relative to the surface, the edge portion of each groove including one or more gaps to allow the container portion to connect to one or more subpixel regions respectively in one or two rows at one or both sides of the groove;

wherein the container portion comprises a curved surface with a largest height relative to the surface at a location proximate to a center thereof.

2. The display panel of claim 1 , wherein the one or more subpixel regions connected to one container portion are of a same color.

3. The display panel of claim 1 , wherein subpixel regions of different color are separately connected to different container portions in respective different grooves.

4. The display panel of claim 1 , wherein the pixel-defining layer includes a first type of groove in an elongated shape extended along a length of a row of subpixel regions and located either between an edge of the base substrate and a first row of subpixel regions or between a last row of subpixel regions and an opposing edge of the base substrate, wherein the first type of groove is connected to subpixel regions of a same color in corresponding first or last rows of subpixel regions.

5. The display panel of claim 1 , wherein the pixel-defining layer includes a second type of groove in an elongated shape extended along a length of a row of subpixel regions and located between at least two adjacent rows of subpixel regions, wherein the second type of groove is connected to subpixel regions of a same color in corresponding two adjacent rows of subpixel regions.

6. The display panel of claim 1 , wherein the pixel-defining layer includes a second type of groove in an elongated shape extended along a length of a row of subpixel regions and located between any two adjacent rows of subpixel regions, wherein any two adjacent second type of grooves are alternately connected to subpixel regions of different color.

7. The display panel of claim 6 , wherein each second type of groove includes at least two sub-grooves and a wall separating any two adjacent sub-grooves, each sub-groove being connected to subpixel regions of a same color.

8. The display panel of claim 6 , wherein each second type of groove includes multiple sub-grooves having a same number of subpixel regions in one row of subpixel regions, wherein each sub-groove is connected to two corresponding subpixel regions of a same color respectively in two adjacent rows of subpixel regions.

9. The display panel of claim 1 , wherein the container portion is about 1 μm-2 μm above the surface in each corresponding subpixel region connected to the container portion.

10. The display panel of claim 1 , wherein each container portion comprises a width along a direction perpendicular to rows of subpixel regions, the width being greater than a width of each subpixel region along a direction of the rows of subpixel regions.

11. The display panel of claim 1 , wherein each of the one or more gaps comprises a width substantially equal to a width of each subpixel region along a direction of rows of subpixel regions.

12. A method of fabricating a display panel comprising:

forming a pixel-defining layer on a surface on a base substrate to define multiple subpixel regions arranged in multiple rows with each subpixel region surrounded by part of the pixel-defining layer; wherein the pixel-defining layer includes one or more grooves, each groove including a container portion partially surrounded by an edge portion, the container portion being at a first height above the surface and the edge portion being at a second height greater than the first height relative to the surface, the edge portion of each groove including one or more gaps to allow the container portion to connect to one or more subpixel regions respectively in one or two rows at one or both sides of the groove;

wherein the container portion is formed to comprise a curved surface with a largest height relative to the surface at a location proximate to a center thereof.

13. The method of claim 12 , wherein the forming a pixel-defining layer comprises:

forming a pixel-defining film on the surface on the base substrate;

removing part of material of the pixel-defining film to form a container portion in each of the one or more grooves, each container portion having the first height relative to the surface.

14. The method of claim 12 , wherein the forming a pixel-defining layer comprises:

forming a first layer of material with a thickness equal to the first height on the surface;

forming a second layer of material on the first layer around edges thereof to form the container portion made by the first layer of material surrounded by the edge portion made by the second layer of material and the first layer of material; and

forming one or more gaps in the edge portion to have the container portion connected to one or more subpixel regions respectively in one or two rows at one or both sides of the groove, wherein the one or more subpixel regions correspond to subpixels of a same color.

15. The method of claim 12 , further comprising dripping an ink material in liquid form into the container portion and flowing the ink material through the one or more gaps in the edge portion into corresponding one or more subpixel regions respectively in one or two rows at one or both sides of the groove.