Flexible sensor
A flexible sensor capable of being stretched from a first state to a second state is provided by the present disclosure. The flexible sensor includes a stretchable substrate and a plurality of sensing elements. The stretchable substrate has a plurality of island portions and a plurality of bridge portions, wherein at least one of the bridge portions connects adjacent two of the island portions. The sensing elements are disposed on the island portions of the stretchable substrate. The at least one of the bridge portions has a first length in the first state and has a second length in the second state, and the first length is different from the second length.
1 . A flexible sensor capable of being stretched from a first state to a second state, comprising:
a stretchable substrate having a plurality of island portions and a plurality of bridge portions, wherein at least one of the plurality of bridge portions connects adjacent two of the plurality of island portions;
a plurality of sensing elements disposed on the plurality of island portions of the stretchable substrate;
a sealing element disposed on one of the plurality of island portions; and
an optical element layer disposed on the plurality of sensing elements, wherein the optical element layer includes a plurality of optical elements corresponding to the plurality of island portions respectively, and one of the plurality of optical elements is disposed on the one of the plurality of island portions and in contact with the sealing element,
wherein in a top view of the flexible sensor, the sealing element is disposed along edges of the one of the plurality of island portions and surrounds a portion of the plurality of sensing elements disposed on the one of the plurality of island portions, and the sealing element is not overlapped with the portion of the plurality of sensing elements,
wherein the sealing element and the one of the plurality of optical elements form a space, and the portion of the plurality of sensing elements is disposed in the space,
wherein the at least one of the plurality of bridge portions has a first length in the first state and has a second length in the second state, and the first length is different from the second length.
2 . The flexible sensor of claim 1 , wherein the flexible sensor has at least one opening region, and four of the plurality of island portions are disposed at periphery of the at least one opening region.
3 . The flexible sensor of claim 1 , wherein each of the plurality of sensing elements is disposed on and corresponding to one of the plurality of island portions.
4 . The flexible sensor of claim 1 , wherein multiple of the plurality of sensing elements are disposed on one of the plurality of island portions.
5 . The flexible sensor of claim 1 , further comprising a supporting spacer disposed on one of the plurality of island portions.
6 . The flexible sensor of claim 1 , further comprising:
a circuit structure disposed on the stretchable substrate, the circuit structure comprising a plurality of sub circuit structures being disposed on a surface of one of the plurality of island portions respectively; and
an organic insulating layer disposed on the circuit structure;
wherein the plurality of sub circuit structures include at least one driving element respectively, and the at least one driving element is electrically connected to one of the plurality of sensing elements.
7 . The flexible sensor of claim 6 , wherein the circuit structure includes a recess, and in the top view of the flexible sensor, the recess is disposed along edges of one of the plurality of island portions and surrounds a portion of the plurality of sensing elements disposed on the one of the plurality of island portions.
8 . The flexible sensor of claim 7 , wherein a portion of the organic insulating layer is filled into the recess and form an anti-cracking structure.
9 . The flexible sensor of claim 6 , wherein the flexible sensor has at least one opening region, in the top view of the flexible sensor, the at least one opening region is surrounded by multiple of the plurality of island portions and the plurality of bridge portions, wherein the organic insulating layer directly contacts the stretchable substrate in the at least one opening region.
10 . The flexible sensor of claim 1 , further comprising a glass layer disposed on the optical element layer.
11 . The flexible sensor of claim 1 , further comprising a stretchable supporting film disposed on the optical element layer.
12 . The flexible sensor of claim 1 , further comprising a supporting film disposed under the stretchable substrate and corresponding to the plurality of island portions of the stretchable substrate.
13 . The flexible sensor of claim 12 , wherein the flexible sensor has at least one opening region, and in the top view of the flexible sensor, the at least one opening region is surrounded by multiple of the plurality of island portions and the plurality of bridge portions, wherein the supporting film is further disposed corresponding to the at least one opening region.
14 . The flexible sensor of claim 13 , wherein a thickness of a portion of the supporting film corresponding to the at least one opening region is less than a thickness of another portion of the supporting film corresponding to the plurality of island portions.
15 . The flexible sensor of claim 1 , further comprising a heat insulating layer disposed on the plurality of island portions correspondingly and covering the plurality of sensing elements.
16 . The flexible sensor of claim 1 , wherein the flexible sensor has at least one opening region, and in the top view of the flexible sensor, the at least one opening region is surrounded by multiple of the plurality of island portions and the plurality of bridge portions, wherein the stretchable substrate includes at least one opening, and the at least one opening corresponds to the at least one opening region.
17 . The flexible sensor of claim 1 , further comprising a connecting wire disposed on the at least one of the plurality of bridge portions and electrically connecting adjacent two of the plurality of sensing elements.
18 . The flexible sensor of claim 17 , further comprising an anti-cracking structure disposed on one of the plurality of island portions, wherein in the top view of the flexible sensor, the anti-cracking structure is not overlapped with the connecting wire.