Cover substrates for displays with decorative layers having integrated logic circuits and methods of forming the same
A glass article comprises a glass substrate having a first major surface and a second major surface, the second major surface being opposite the first major surface and a decorative ink layer disposed on the second major surface of the decorative ink layer and a conductive ink layer disposed on the second major surface. The conductive ink layer comprises conductive material dispersed in a dispersion medium and a sheet resistance that is less than a sheet resistance of the decorative ink layer. The conductive ink layer comprises a plurality of sensing structures arranged in a touch sensing circuit configured to vary in electrical properties in response to electromagnetic interactions with an external object.
1 . A glass article comprising:
a glass substrate having a first major surface and a second major surface, the second major surface being opposite the first major surface;
a decorative ink layer disposed on the second major surface of the glass substrate, the decorative ink layer comprising a colorant; and
a conductive ink layer disposed on the second major surface of the glass substrate, the conductive ink layer comprising conductive ink portions having a sheet resistance that is less than a sheet resistance of decorative ink portions of the decorative ink layer,
wherein at least some of the conductive ink portions form a plurality of sensing structures arranged in a touch sensing circuit configured to vary in electrical properties in response to electromagnetic interactions with an external object,
wherein the conductive ink layer does not include a transparent conductive oxide, and
wherein (i) both the conductive ink layer and the decorative ink layer directly contact the second major surface, or (ii) the conductive ink layer is disposed on the decorative ink layer and not in contact with the second major surface, and a dimension of the plurality of sensing structures, in a direction parallel to the second major surface, is greater than or equal to 100 μm.
2 . The glass article of claim 1 , wherein both the conductive ink layer and the decorative ink layer directly contact the second major surface.
3 . The glass article of claim 1 , wherein the conductive ink layer is disposed on the decorative ink layer and not in contact with the second major surface.
4 . The glass article of claim 1 , wherein:
the decorative ink layer comprises an optical transmission throughout the visible spectrum that is less than that of the conductive ink layer, and
an interior boundary of the decorative ink layer defines a display viewing region of the second major surface that is not covered by the decorative ink layer.
5 . The glass article of claim 4 , wherein, within the display viewing region, the glass article exhibits a transmittance of greater than or equal to 20% throughout the visible spectrum for light normally incident on the first major surface of the glass article.
6 . The glass article of claim 4 , wherein at least some of the plurality of sensing structures are disposed on the display viewing region.
7 . The glass article of claim 1 , wherein the conductive material comprises a plurality of conductive nanowires, carbon nanotubes, or conductive polymers.
8 . The glass article of claim 1 , wherein the colorant comprises an inorganic material or a dielectric material.
9 . The glass article of claim 1 , further comprising a frame attached to the glass substrate such that the frame retains the glass substrate in a curved configuration to form an asymmetric stress distribution in the glass substrate.
10 . The glass article of claim 1 , wherein:
the decorative ink layer defines a shape of an icon visible through the glass article, and
at least some of the plurality of sensing structures are disposed within the icon such that an interaction with the glass article on the icon changes the electrical properties.
11 . The glass article of claim 10 , wherein the icon defines a touch sensitive vehicle control icon.