Touch screen, fabrication method thereof, and display apparatus

1. A touch screen, comprising a pixel region disposed over a base substrate, wherein:

the pixel region is surrounded by a first barrier, configured to insulate the pixel region; and

the pixel region comprises:

a first electrode;

a light-emitting layer, disposed over the first electrode; and

a second electrode, disposed over the light-emitting layer;

wherein:

the second electrode expands over an opening of the first barrier so as to be able to electrically connect with a third electrode outside the pixel region;

the first barrier comprises a first portion and a second portion;

a first height of the first portion is greater than or equal to a sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode;

a second height of the second portion is greater than or equal to a sum of thicknesses of the first electrode and the light-emitting layer, but lower than the sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode; and

the opening is arranged on the second portion.

2. The touch screen of claim 1 , wherein:

the first barrier has a double-wall structure including a gap arranged therein; and

an electrode lead wire is disposed in the gap and is electrically connected with the second electrode over the opening of the first barrier.

3. The touch screen of claim 2 , further comprising a transparent cover, disposed over the second electrode.

4. A display apparatus, comprising the touch screen according to claim 1 .

5. The display apparatus according to claim 4 , wherein the display apparatus is a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital picture frame, or a navigation system.

6. A method for fabricating a touch screen according to claim 1 , the method comprising:

forming the first electrode and the light-emitting layer over the base substrate; and

forming the second electrode over the light-emitting layer via a solution process.

7. The method of claim 6 , wherein the solution process is inkjet printing.

8. The method of claim 6 , wherein the first barrier has a double-wall structure including a gap arranged therein, and the step of forming the second electrode over the light-emitting layer via a solution process comprises:

simultaneously forming an electrode lead wire in the gap of the double-wall structure, wherein the electrode lead wire is electrically connected with the second electrode over the opening of the first barrier.

9. The method of claim 6 , further comprising, prior to the step of forming the first electrode and the light-emitting layer over the base substrate, a step of:

forming the first barrier over the base substrate.

10. The method of claim 9 , wherein the step of forming the first barrier over the base substrate comprises a patterning process and an etching process.

11. A touch screen, comprising a pixel region disposed over a base substrate, wherein:

the pixel region is surrounded by a first barrier, configured to insulate the pixel region; and

the pixel region comprises:

a first electrode;

a light-emitting layer, disposed over the first electrode; and

a second electrode, disposed over the light-emitting layer;

wherein:

the second electrode expands over an opening of the first barrier so as to be able to electrically connect with a third electrode outside the pixel region; and

the pixel region comprises a plurality of sub-pixel regions, separated and insulated by at least one second barrier, configured such that:

each of the plurality of sub-pixel regions comprises a segment of the first electrode; and

the second electrode is disposed over the plurality of sub-pixel regions and the at least one second barrier.

12. The touch screen of claim 11 , wherein each of the at least one second barriers has a height greater than or equal to a thickness of the first electrode, but lower than the sum of thicknesses of the first electrode and the light-emitting layer.

13. The touch screen of claim 11 , wherein each of the at least one second barriers has a height greater than or equal to a sum of thicknesses of the first electrode and the light-emitting layer, but lower than the sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode.

14. The touch screen of claim 11 , wherein the second electrode is configured to have a reduced parasitic capacitance and an enhanced touch-control capability.

15. The touch screen of claim 14 , wherein:

the second electrode comprises a hollow region and a non-hollow region; and

each of the at least one second barriers comprises a first part and a second part, corresponding to the hollow region and the non-hollow region respectively, and a height of the first part is greater than a height of the second part.

16. The touch screen of claim 15 , wherein:

the height of the first part is configured to be greater than or equal to a sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode; and

the height of the second part is configured to be greater than or equal to a thickness of the first electrode, and lower than the sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode.

17. The touch screen of claim 11 , wherein the first electrode is an anode, and the second electrode is a cathode and a touch-control electrode.

18. The touch screen of claim 17 , wherein the light-emitting layer comprises at least one organic light-emitting material.

19. The touch screen of claim 11 , wherein each of the plurality of sub-pixel regions further comprises a pixel control circuit, disposed between the base substrate and the first electrode.