Touch sensor panel having an index matching passivation layer
First Claim
1. A touch sensor panel stackup, comprising:
- a plurality of conductive material layers having a first refractive index;
a plurality of adhesive layers having a second refractive index, each adhesive layer paired with a conductive material layer for adhering the conductive material layer to additional material;
a first index matching passivation layer disposed between a first conductive material layer and a first adhesive layer, and a second index matching passivation layer disposed between a second conductive material layer and a second adhesive layer, wherein;
the first and second index matching passivation layers, the first and second conductive material layers, and the first and second adhesive layers are separate layers,the first and second index matching passivation layers have a third refractive index that is between the first and second refractive indices and are disposed on a first side of each of the first and second conductive material layers, respectively; and
first and second index matching layers are disposed on each of a second side of the first and second conductive material layers, respectively.
1 Assignment
0 Petitions
Accused Products
Abstract
Touch sensor panels typically include a plurality of layers that can be stacked on top of each other. When the touch sensor panel is used in a bright environment, incident light can hit the interfaces between those layers of the stackup having mismatched refractive indices and can reflect off those interfaces. The light reflected from those interfaces can give rise to the appearance of fringes on the touch sensor panel, which can be visually distracting. In order to reduce the appearance of these fringes, embodiments of the disclosure are directed to the addition of an index matching passivation layer between a conductive layer of traces and an adhesive layer in the touch sensor panel stackup.
-
Citations
23 Claims
-
1. A touch sensor panel stackup, comprising:
-
a plurality of conductive material layers having a first refractive index; a plurality of adhesive layers having a second refractive index, each adhesive layer paired with a conductive material layer for adhering the conductive material layer to additional material; a first index matching passivation layer disposed between a first conductive material layer and a first adhesive layer, and a second index matching passivation layer disposed between a second conductive material layer and a second adhesive layer, wherein; the first and second index matching passivation layers, the first and second conductive material layers, and the first and second adhesive layers are separate layers, the first and second index matching passivation layers have a third refractive index that is between the first and second refractive indices and are disposed on a first side of each of the first and second conductive material layers, respectively; and first and second index matching layers are disposed on each of a second side of the first and second conductive material layers, respectively. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A touch sensor panel, comprising:
-
a first conductive layer of traces; a first adhesive; a first set of one or more index matching passivation layers separate from and disposed between the first adhesive and a first side of the first conductive layer of traces; a second conductive layer of traces; a second adhesive; a second set of one or more index matching passivation layers separate from and disposed between the second adhesive and a first side of the second conductive layer of traces, wherein the index matching passivation layers in the first and second sets are selected to reduce the interference of light reflected from a first interface between the first adhesive and the first conductive layer of traces and from a second interface between the second adhesive and the second conductive layer of traces; and a set of one or more index matching layers disposed on a second side of the first and second conductive layer of traces. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
-
-
14. A touch sensor panel, comprising:
-
a first conductive layer of traces; a first adhesive; a first set of one or more index matching passivation layers separate from and disposed between the first adhesive and a first side of the first conductive layer of traces; a second conductive layer of traces; a second adhesive; a second set of one or more index matching passivation layers separate from and disposed between the second adhesive and a first side of the second conductive layer of traces, wherein the index matching passivation layers in the first set reduces a percentage of light reflectance at a first interface between the index matching passivation layers in the first set and the first adhesive and at a second interface between the index matching passivation layers in the first set and the first conductive layer of traces, and wherein the index matching passivation layers in the second set reduces a percentage of light reflectance at a third interface between the index matching passivation layers in the second set and the second adhesive and at a fourth interface between the index matching passivation layers in the second set and the second conductive layer of traces; and a set of one or more index matching layers disposed on a second side of the first and second conductive layer of traces. - View Dependent Claims (15, 16)
-
-
17. A method of reducing the appearance of fringes on a touch sensor panel having a first and second conductive layer of traces, a first and second adhesive, and a first and second index matching layer, the method comprising:
-
forming a first and second set of one or more index matching passivation layers, the first and second sets of one or more index matching passivation layers separate from the first and second conductive layers of traces, the first and second adhesive, and the first and second index matching layer; disposing the first set of index matching passivation layers between the first conductive layer of traces and the first adhesive; disposing the second set of index matching passivation layers between the second conductive layer of traces and the second adhesive; and using the first and second sets of index matching passivation layers to reduce the interference of light reflected from a first interface between the first adhesive and the first conductive layer of traces and from a second interface between the second adhesive and the second conductive layer of traces. - View Dependent Claims (18, 19, 20)
-
-
21. A method of reducing the appearance of fringes on a touch sensor panel having a first and second conductive layer of traces, a first and second adhesive, and a first and second index matching layer, the method comprising:
-
forming a first and second set of one or more index matching passivation layers, the first and second sets of one or more index matching passivation layers separate from the first and second conductive layers of traces, the first and second adhesive, and the first and second index matching layer; disposing the first set of index matching passivation layers between the first conductive layer of traces and the first adhesive; disposing the second set of index matching passivation layers between the second conductive layer of traces and the second adhesive; using the index matching passivation layers in the first set to reduce a percentage of light reflectance at a first interface between the index matching passivation layers in the first set and the first adhesive and at a second interface between the index matching passivation layers in the first set and the first conductive layer of traces; and using the index matching passivation layers in the second set to reduce a percentage of light reflectance at a third interface between the index matching passivation layers in the second set and the second adhesive and at a fourth interface between the index matching passivation layers in the second set and the second conductive layer of traces. - View Dependent Claims (22, 23)
-
Specification