Granted Patent B2

US 9,608,047 · App. 14/254,979 · Granted Mar 28, 2017

Abstract

Claims (23)

1. An apparatus comprising:

a display stack for a touch-sensitive screen, the display stack comprising a plurality of layers in which a top layer comprises a substantially transparent cover layer, the plurality of layers further comprising a first polarizer that is below the substantially transparent cover layer and a second polarizer that is below the substantially transparent cover layer and a liquid crystal layer, the display stack being configured to display a color image;

a touch sensor within the display stack, the touch sensor comprising:

a plurality of first conductive electrodes formed on and contacting a color filter layer of a subset of the plurality of layers, the subset being below the substantially transparent cover layer; and

a plurality of second conductive electrodes formed on and contacting the color filter layer of the subset of the plurality of layers; and

wherein the plurality of first conductive electrodes and the plurality of second conductive electrodes are located between the first polarizer and the second polarizer.

2. The apparatus of claim 1 , wherein the display stack is devoid of a polarizing layer between the first and second polarizers.

3. The apparatus of claim 1 , wherein the plurality of first conductive electrodes and the plurality of second conductive electrodes contact a same side of the color filter.

4. The apparatus of claim 2 , wherein the plurality of first conductive electrodes contact a first side of the color filter layer and the plurality of second conductive electrodes contact a second side of the color filter layer.

5. The apparatus of claim 1 , wherein at least one of the subset of the plurality of layers comprises a flexible substrate layer is comprised of non-birefringent material.

6. The apparatus of claim 1 , wherein the subset of the plurality of layers comprises a layer of polyethylene terephthalate material.

7. The apparatus of claim 1 , wherein the plurality of first conductive electrodes and the plurality of second conductive electrodes comprise fine line metal electrodes.

8. A device comprising:

a display stack for a touch-sensitive screen, the display stack comprising a plurality of layers in which a top layer comprises a substantially transparent cover layer, the plurality of layers further comprising a first polarizer that is below the substantially transparent cover layer and a second polarizer that is below the substantially transparent cover layer and a liquid crystal layer, the display stack being configured to display a color image;

a touch sensor within the display stack, the touch sensor comprising:

a plurality of first conductive electrodes formed on and contacting a color filter layer of a subset of the plurality of layers, the subset being below the substantially transparent cover layer; and

a plurality of second conductive electrodes formed on and contacting the color filter layer of the subset of the plurality of layers; and

a controller coupled to the touch sensor and operable to control the touch sensor; and

wherein the plurality of first conductive electrodes and the plurality of second conductive electrodes are located between the first polarizer and the second polarizer.

9. The device of claim 8 , wherein the plurality of first conductive electrodes and the plurality of second conductive electrodes contact a same side of the color filter layer.

10. The device of claim 8 , wherein the plurality of first conductive electrodes contact a first side of the color filter layer and the plurality of second conductive electrodes contact a second side of the color filter layer.

11. The device of claim 8 , wherein the subset of the plurality of layers comprises a flexible substrate layer comprised of non-birefringent material.

12. The device of claim 8 , wherein the subset of the plurality of layers comprises a layer of polyethylene terephthalate material.

Assignments (14)