Touch screen, manufacturing method thereof and touch display apparatus

1. A touch screen, comprising:

a substrate;

a sensing component arranged on the substrate;

an inner frame layer arranged to surround the sensing component; and

an outer frame layer formed around an outer periphery of the inner frame layer, for encapsulating the sensing component and the inner frame layer,

wherein at least one step portion is arranged on an inner side of the outer frame layer; and

wherein the inner frame layer has a width of 0.1-0.5 mm and a thickness of 6-10 μm.

2. The touch screen according to claim 1 , wherein an inner side of the outer frame layer covers at least one part of the inner frame layer and/or the sensing component.

3. The touch screen according to claim 2 , wherein a width of the at least one part of the inner frame layer and/or the sensing component is 0.05-0.1 mm.

4. The touch screen according to claim 1 , wherein the outer frame layer is made of ink material.

5. The touch screen according to claim 1 , wherein a wiring layer is arranged on the outer frame layer, and the wiring layer is electrically connected to a sensing electrode of the sensing component, so that the sensing electrode is electrically connected to an external control circuit.

6. The touch screen according to claim 5 , wherein the wiring layer is electrically connected, via the step portion, to the sensing electrode from a top of the outer frame layer.

7. The touch screen according to claim 5 , wherein the wiring layer is made of silver paste material.

8. The touch screen according to claim 1 , wherein the inner frame layer is made of ink material.

9. The touch screen according to claim 1 , wherein the sensing component comprises a plurality of first sensing electrodes and a plurality of second sensing electrodes which are arranged to be intersected.

10. The touch screen according to claim 9 , wherein the sensing component further comprises:

a plurality of bridging portions, arranged on intersection points of the plurality of first sensing electrodes and the plurality of second sensing electrodes on the substrate; and

a plurality of insulating layers, arranged on the substrate and covering the bridging portions,

wherein the plurality of first sensing electrodes cross the plurality of insulating layers respectively, and the plurality of second sensing electrodes are electrically connected to the plurality of bridging portions respectively.

11. The touch screen according to claim 9 , wherein the outer frame layer is formed by a plurality of stacked ink layers.

12. The touch screen according to claim 11 , wherein the outer frame layer comprises a white ink layer and a black ink layer which are stacked alternately, wherein the white ink layer comprises at least one white ink sub-layer.

13. A touch display apparatus, comprising a touch screen according to claim 1 .

14. A method of manufacturing a touch screen, comprising steps of:

forming a sensing component on a substrate;

forming an inner frame layer on the substrate by surrounding the sensing component;

forming an outer frame layer on the substrate by surrounding the inner frame layer, to encapsulate the sensing component and the inner frame layer;

forming at least one step portion of an inner side of the outer frame layer over the at least one part of the sensing component by a screen printing process; and

wherein the inner frame layer has a width of 0.1-0.5 mm and a thickness of 6-10 μm.

15. The method according to claim 14 , wherein the step of forming the outer frame layer on the substrate by surrounding the inner frame layer comprises:

forming a plurality of stacked ink layers made of ink material by a screen printing process, so as to form the outer frame layer.

16. The method according to claim 15 , wherein an inner side of the outer frame layer covers at least one part of the inner frame layer and/or the sensing component.

17. The method according to claim 16 , wherein after the outer frame layer being made of ink material is formed by surrounding the inner frame layer, a wiring layer is formed on the outer frame layer by the screen printing process, the wiring layer being electrically connected to a sensing electrode of the sensing component so that the sensing electrode is electrically connected to an external control circuit.

18. The method according to claim 17 ,

wherein the wiring layer which is electrically connected to the sensing electrode is formed by printing silver paste on a top of the outer frame layer and on the step portion by the screen printing process.

19. The method according to claim 14 , wherein the steps of forming the sensing component on the substrate and forming the inner frame layer on the substrate by surrounding the sensing component comprise:

forming a plurality of bridging portions on the substrate by a patterning process;

forming a plurality of insulating layers on the substrate which cover the plurality of bridging portions respectively;

forming the inner frame layer on the substrate which surrounds the plurality of bridging portions, wherein the inner frame layer is made of ink material by a screen printing press and there is a gap between the inner frame layer and the outermost bridging portion; and

forming a sensing electrode of the sensing component on the substrate by the patterning process, wherein the sensing electrode comprises a plurality of first sensing electrodes and a plurality of second sensing electrodes which are arranged to be intersected, the plurality of first sensing electrodes crossing the plurality of insulating layers respectively, and the plurality of second sensing electrodes electrically being connected to the plurality of bridging portions respectively.