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1. (WO2017112435) ELECTRONIC DEVICE STACK ASSEMBLY
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CLAIMS

WHAT IS CLAIMED IS:

1. An electronic device comprising:

a display sub-assembly:

a light sub-assembly coupled to the display sub-assembly, the light sub-assembly comprising:

a light flexible printed circuit (FPC), the light FPC comprising a target fiducial; a plurality of light sources coupled to the light FPC;

a light guide having a first edge adjacent to the plurality of light sources, wherein the light guide comprises a pattern of optical surface features and an alignment feature aligned with the target fiducial;

a first tape layer adhered to a portion of the light FPC and a first portion of the first side of the light guide, the first tape layer comprising a yellow pigment;

a second tape layer adhered to the first tape layer; and

a touch sub-assembly coupled to the light sub-assembly, wherein the touch sub-assembly is configured to receive touch input.

2. The electronic device of claim 1, wherein:

the first tape layer comprises a white tape and a first adhesive material containing the yellow pigment.

3. The electronic device of any of claims 1-2, further comprising:

a first stiffener member coupled to the light FPC; and

a second stiffener member removably coupled to the first stiffener member.

4. The electronic device of any of claims 1-3, wherein the EPD layer comprises four corner regions and the glass substrate comprises four corner regions, the electronic device further comprising:

a first sealing material comprising an edge cured moisture barrier, the first sealing material formed on the four corner regions; and

a second sealing material comprising a room temperature vulcanized (RTV) silicone, the second sealing material formed on the two of the four corner regions of the glass substrate closest to the light FPC.

5. The electronic device of any of claims 1-5, wherein:

the light FPC comprises a plurality of conductive contact pads, wherein a first one of the plurality of conductive contact pads comprises the target fiducial; and

each of the plurality of light sources is coupled to a corresponding one of the plurality of conductive contact pads.

6. The electronic device of any of claims 1-6, wherein:

the second tape layer comprises a black tape and covers a portion of the pattern of optical surface features.

7. The electronic device of any of claims claim 1-6, wherein:

the second tape layer comprises a plurality of perforations and covers a portion of the pattern of optical surface features.

8. The electronic device of any of claims 1-7, further comprising a cover glass coupled to the touch sub-assembly with a first optically clear adhesive (OCA) layer, wherein:

the touch sub-assembly is coupled to the light sub-assembly with a second OCA layer; and

the light sub-assembly is coupled to the display sub-assembly with a third OCA layer.

9. The electronic device of any of claims 1-8, wherein:

the display sub-assembly comprises:

a plastic sheet having a first surface and an opposing second surface; a glass substrate having a first surface and an opposing second surface, wherein the second surface of the glass substrate is coupled to the first surface of the plastic sheet;

an EPD layer having a first surface and an opposing second surface, wherein the second surface of the EPD layer is coupled to the first surface of the glass substrate;

a plastic film having a first surface and an opposing second surface, wherein the second surface of the plastic film is coupled to the first surface of the EPD layer; and

a first display FPC coupled to an edge of the glass substrate, wherein the display sub-assembly is configured to display content.

10. A method of manufacturing an electronic device, comprising:

coupling a first optically clear adhesive (OCA) layer to a cover glass;

coupling a touch sub-assembly to the cover glass with the first OCA layer;

performing a first autoclave process at a first temperature on the touch sub-assembly coupled to the cover glass;

coupling a light guide to a light flexible printed circuit (FPC);

applying a first tape layer to a portion of the light FPC and a first portion of the first side of the light guide, the first tape layer comprising a yellow pigment;

applying a second tape layer to the first tape layer and a second portion of first side of the light guide;

applying a second OCA layer to the first side of the light guide;

coupling the touch sub-assembly to the light guide with the second OCA layer;

performing a second autoclave process at a second temperature on the touch subassembly coupled to the light guide;

applying a third OCA layer to a second side of the light guide opposite the first side; and coupling the display sub-assembly to the light guide with the third OCA layer.

11. The method of claim 10, wherein:

the second temperature is higher than the first temperature.

12. The method of claim 10, further comprising:

performing a third autoclave process on the touch sub-assembly coupled to the light guide;

performing a fourth autoclave process on the touch sub-assembly coupled to the light guide; and

performing the fourth autoclave process comprises performing the fourth autoclave process at a higher temperature than the third autoclave process.

13. The method of claim 10, wherein:

the first autoclave process comprises exposing the touch sub-assembly, the first OCA layer, and the cover glass to a temperature of at least about 40°C and a pressure of at least about 5.5 kgf/cm2.

14. The method of claim 10, further comprising:

performing a first plasma treatment process on the light guide;

performing a second plasma treatment process on the touch sub-assembly coupled to the light guide; and

performing a third plasma treatment process on the display sub-assembly.

15. The method of claim 10, wherein coupling the light guide to the light FPC comprises: aligning an alignment feature on the light guide with a target fiducial on the light FPC.