Two-wire fabric touch panel
A two-wire fabric touch panel includes a first wire, a second wire, an upper conductor layer, a middle conductor layer, and a lower conductor layer. The first wire is connected to the upper conductor layer, and the second wire is connected to the lower conductor layer. The middle conductor layer has a conductivity significantly lower than conductivities of the upper conductor layer and the lower conductor layer, and the middle conductor layer has different resistances at various positions in a plane. At least one of the upper conductor layer and the lower conductor layer is isolated from the middle conductor layer when an external force is absent, and a resistance between the upper conductor layer and the lower conductor layer is infinite. The upper conductor layer and the lower conductor layer are connected through the middle conductor layer at the pressure position when subjected to pressure.
1 . A two-wire fabric touch panel, comprising: a first wire, a second wire, an upper conductor layer, a middle conductor layer, and a lower conductor layer,
wherein the first wire is connected to the upper conductor layer, the second wire is connected to the lower conductor layer, the middle conductor layer has a conductivity lower than conductivities of the upper conductor layer and the lower conductor layer, and the middle conductor layer has different resistances at various positions in a plane, creating a unique correspondence between the position and resistance,
wherein at least one of the upper conductor layer and the lower conductor layer is isolated from the middle conductor layer when an external force is absent, and a resistance between the upper conductor layer and the lower conductor layer is infinite, and
wherein the upper conductor layer and the lower conductor layer are connected through the middle conductor layer at a pressure position when subjected to pressure, such that a resistance signal is measured through the upper conductor layer and the lower conductor layer, and at least two of the upper conductor layer, the middle conductor layer and the lower conductor layer remain isolated.
2 . The two-wire fabric touch panel according to claim 1 , wherein at least one of the upper conductor layer and the lower conductor layer has a non-conductive protrusion structure to support the at least one of the upper conductor layer and the lower conductor layer to remain isolated from the middle conductor layer.
3 . The two-wire fabric touch panel according to claim 1 , further comprising an elastic isolation layer between one of the upper conductor layer and the lower conductor layer and the middle conductor layer, or comprising elastic isolation layers respectively between the upper conductor layer and the middle conductor layer, and between the middle conductor layer and the lower conductor layer,
wherein the elastic isolation layer or each of the elastic isolation layers is provided with through holes, such that when subjected to the external force, at least one of the upper conductor layer and the lower conductor layer is in contact with the middle conductor layer through the through holes to form a conductive path.
4 . The two-wire fabric touch panel according to claim 3 , wherein the upper conductor layer, the middle conductor layer, the lower conductor layer, and the elastic isolation layer or layers are made of a textile material, and the elastic isolation layer or each of the elastic isolation layers is of a planar structure or a curved surface structure.
5 . The two-wire fabric touch panel according to claim 3 , wherein the elastic isolation layer or each of the elastic isolation layers is any one of an elastic mesh fabric, an elastic net fabric, or a loose-structured elastic fabric woven or knitted from elastic fibers, and is connected to at least two of the upper conductor layer, the middle conductor layer, and the lower conductor layer through adhesives, sewing integration or three-dimensional weaving or knitting technology.
6 . The two-wire fabric touch panel according to claim 1 , wherein when the middle conductor layer is a continuous conductor, a thickness of each unit plane of the middle conductor layer is lower than a width and a length of the unit plane.
7 . The two-wire fabric touch panel according to claim 1 , wherein each of the upper conductor layer and the lower conductor layer is a fabric with a metal coating or a conductive composite material coating or an intrinsic conductive polymer coating, or a fabric woven or knitted from conductive fibers, or a fabric woven or knitted from a mixture of conductive fibers and non-conductive fibers.
8 . The two-wire fabric touch panel according to claim 1 , further comprising a fabric layer, wherein the upper conductor layer and the lower conductor layer are attached to the fabric layer through screen printing, stencil printing or spraying.
9 . The two-wire fabric touch panel according to claim 1 , wherein the upper conductor layer and the lower conductor layer are double-layer or multi-layer flexible conductive films obtained by deposition, chemical plating, or electrochemical plating.
10 . The two-wire fabric touch panel according to claim 1 , wherein the middle conductor layer is any one of a conductive nanocomposite, a conductive polymer composite material, and a conductive fabric, and each unit square of the middle conductor layer is subjected to different number of printings to form different surface resistances, or conductive materials with different resistivities are printed on each square respectively to form different surface resistances for each square, or conductive yarns, filaments or fibers with different resistance at each section are woven or knitted into cloth according to specific rules.