Foldable cover and display for an electronic device

1. A portable electronic device comprising:

a touch-sensitive display;

a battery;

a foldable enclosure enclosing the touch-sensitive display and the battery, the foldable enclosure comprising:

a front cover positioned over the touch-sensitive display and including a chemically strengthened glass layer defining:

a first region positioned over a first portion of the touch-sensitive display;

a second region positioned over a second portion of the touch-sensitive display; and

a foldable region positioned over a third portion of the touch-sensitive display between the first and the second portions of the touch-sensitive display, the foldable enclosure configured to:

in a folded configuration:  define a first graphical output using the first portion of the touch-sensitive display and viewable along a front of the portable electronic device;  define a second graphical output using the second portion of the touch-sensitive display and viewable along a rear of the portable electronic device opposite to the front; and  define a third graphical output using the third portion of the touch-sensitive display and viewable along a side of the portable electronic device extending between the front and the rear; and

in an unfolded configuration, define a fourth graphical output using the first, second, and third portions of the touch-sensitive display.

2. The portable electronic device of claim 1 , wherein:

the chemically strengthened glass layer at the foldable region defines a relief feature comprising a locally thinned region; and

the foldable region further comprises a filler disposed in the relief feature and optically matched to the chemically strengthened glass layer.

3. The portable electronic device of claim 1 , wherein the chemically strengthened glass layer is formed of an aluminosilicate glass.

4. The portable electronic device of claim 1 , wherein in the unfolded configuration, the first, second, and foldable portions define a front surface of the portable electronic device that is flat.

5. The portable electronic device of claim 1 , wherein:

in response to transitioning from the folded configuration to the unfolded configuration, a first aspect ratio associated with a size of the fourth graphical output changes to a second aspect ratio associated with a size of the first graphical output.

6. The portable electronic device of claim 1 , wherein:

in the folded configuration, the foldable region defines a curved surface having a minimum bend radius between 10 mm and 25 mm.

7. The portable electronic device of claim 1 , wherein the chemically strengthened glass layer is configured to produce compressive stresses on the outside of a bend in the foldable region.

8. An electronic device comprising:

a touch-sensitive display;

a battery;

a foldable enclosure enclosing the touch-sensitive display and the battery, the foldable enclosure having a folded configuration and an unfolded configuration, the foldable enclosure comprising:

a cover positioned over the touch-sensitive display and including a glass layer comprising a ceramic, the cover defining:

a first region defining a first external surface of the electronic device;

a second region defining a second external surface of the electronic device; and

a foldable region defining a third external surface of the electronic device between the first and the second external surface, the cover defining a contiguous external surface including the first, second, and third external surfaces, wherein:

in the folded configuration, the third external surface defines a side portion of the electronic device, the first external surface defines a front portion of the electronic device, and the second external surface defines a rear portion of the electronic device; and

in the unfolded configuration, the first, second, and third external surfaces define the front portion of the electronic device.

9. The electronic device of claim 8 , wherein:

the electronic device further comprises a processor configured to:

in the unfolded configuration, cause display of a first graphical output; and

in the folded configuration, cause display of a second graphical output different from the first graphical output, the second graphical output adapted to at least a viewable area defined by the first external surface.

10. The electronic device of claim 8 , wherein the cover comprises a locally-thinned region configured to relieve stresses in the cover at the foldable region.

11. The electronic device of claim 8 , wherein the cover comprises multiple ceramic layers having a respective thickness, at least one ceramic layer having a different thickness from other respective thicknesses.

12. The electronic device of claim 8 , wherein

the foldable enclosure has an intermediate configuration between the unfolded configuration and the folded configuration; and

a compressive stress at the third external surface in the unfolded configuration is greater than a compressive stress at the third external surface in the intermediate configuration.

13. The electronic device of claim 8 , wherein a thickness of cover at the foldable region is uniform.

14. The electronic device of claim 8 , wherein:

the glass layer defines a relief feature comprising a locally thinned region; and

a filler disposed in the relief feature and optically matched to the glass layer.

15. A portable electronic device comprising:

a battery;

a display layer;

a glass cover layer coupled to the display layer, the glass cover layer configured to be moved between a folded configuration and an unfolded configuration, the glass cover layer comprising:

a first region positioned over a first portion of the display layer;

a second region positioned over a second portion of the display layer;

a foldable region positioned over a third portion of the display layer between the first and second region;

a housing coupled to the glass cover layer and enclosing the battery and the display layer, the housing movable with the glass cover layer to the folded configuration and to the unfolded configuration; and

a processor configured to:

in the folded configuration:

cause display of a first graphical output at the first portion of the display layer;

cause display of a second graphical output at the second portion of the display layer; and

cause display of a third graphical output at the third portion of the display layer; and

in the unfolded configuration, cause display of a fourth graphical output, the fourth graphical output comprising a combined graphical output over the first, second, and third portions of the display layer.

16. The portable electronic device of claim 15 , wherein the portable electronic device further comprises:

a sensor configured to detect a transition between the folded and the unfolded configuration of the portable electronic device; and

processing circuitry operatively coupled to the sensor and the display layer and configured to control at least one of the first, the second, the third, and the fourth graphical outputs based on an output from the sensor.

17. The portable electronic device of claim 15 , wherein the first, second, and third graphical outputs are viewable when the portable electronic device is in the folded configuration.

18. The portable electronic device of claim 15 , wherein the glass cover layer includes a chemically strengthened glass strengthened through ion exchange.

19. The portable electronic device of claim 15 , wherein

the housing comprises a rear cover positioned opposite the glass cover layer; and

the rear cover defines an internal surface of the portable electronic device in the folded configuration.

20. The portable electronic device of claim 19 , wherein the rear cover is chemically strengthened glass.