Protection film structure with composite hardening layer

1 . A protection film structure comprising:

a transparent substrate having a first face and a second face;

at least two tiling layers comprising:

a first tiling layer arranged on one side of the first face of the transparent substrate and comprising a plurality of first tiling islands, two adjacent ones of the first tiling islands, two adjacent one of the first tiling islands having a gap between;

a second tiling layer arrange on one face of the first tiling layer away from the transparent substrate and comprising a plurality of second tiling islands, two adjacent ones of the second tiling islands having a gap therebetween; and

at least one composite hardening layer arranged between the adjacent tiling layers, and the composite hardening layers comprising:

a first hardening layer, wherein the first hardening layer is silicon nitride (SiNx), and

a second hardening layer made from a different material than the first hardening layer, wherein a material hardness of the first hardening layer is larger than a material hardness of the second hardening layer.

2 . The protection film structure in claim 1 , wherein one of the second tiling islands of the second tiling layer is at least partially overlapped with at least one of the first tiling islands of the first tiling layer along a projection direction.

3 . The protection film structure in claim 2 , wherein one of the second tiling islands of the second tiling layer is at least partially overlapped with at least two different first tiling islands of the first tiling layer along a projection direction.

4 . The protection film structure in claim 2 , wherein one of the second tiling islands of the second tiling layer is at least partially overlapped with at least three different first tiling islands of the first tiling layer along a projection direction.

5 . The protection film structure in claim 2 , further comprising a third tiling layer arranged on one side of the second tiling layer away from the first tiling layer, the third tiling layer comprising a plurality of third tiling islands, two adjacent ones of the third tiling islands having a gap therebetween, one of the third tiling islands of the third tiling layer is at least partially overlapped with at least one second tiling island of the second tiling layer along a projection direction.

6 . The protection film structure in claim 2 , wherein areas of the first tiling islands and the second tiling islands are respectively not less than 250 square micrometers.

7 . The protection film structure in claim 2 , wherein areas of the first tiling islands and the second tiling islands are not more than 50 square millimeters respectively.

8 . The protection film structure in claim 1 , wherein one of the composite hardening layers comprises three hardening layers.

9 . The protection film structure in claim 1 , further comprising at least one additional hardening layer arranged between the transparent substrate and the first tiling layer.

10 . The protection film structure in claim 1 , further comprising an outer hardening layer arranged on a side of the tiling layer most away from the transparent substrate and the side being opposite to the transparent substrate, the outer hardening layer has a hardness greater than pencil hardness 6H.

11 . The protection film structure in claim 10 , wherein the outer hardening layer is a silicon nitride hardening layer with thickness less than 1 micrometer.

12 . The protection film structure in claim 1 , wherein the tiling layers are made of organic material and have thickness not less than 0.5 micrometers.

13 . The protection film structure in claim 12 , wherein the organic material is acrylic material or photosensitive polyimide.

14 . The protection film structure in claim 1 , wherein the transparent substrate is a polymer material substrate or an ultra-thin glass substrate with thickness not more than 200 micrometers.