Device having integrated interface system

1. A device comprising:

a display portion comprising:

a display housing; and

a display within the display housing;

a base portion flexibly coupled to the display portion and comprising:

a bottom case;

a glass top case defining, along an exterior surface of the glass top case:

a keyboard region configured to receive a first user input; and

a trackpad region configured to receive a second user input;

an input sensing system configured to determine a location of a touch input applied to the trackpad region; and

a hand presence sensing system configured to detect a presence of a user's hand over the keyboard region; and

a processing system operatively coupled to the hand presence sensing system and the input sensing system and configured to, in response to detecting the presence of the user's hand with the hand presence sensing system, change a mode of operation of the input sensing system.

2. The device of claim 1 , wherein the hand presence sensing system comprises an optical sensor.

3. The device of claim 2 , wherein the optical sensor comprises:

an optical emitter configured to emit light through the glass top case; and

an optical detector configured to detect light through the glass top case.

4. The device of claim 1 , wherein the processing system is configured to change the input sensing system from:

a first mode of operation in which the touch input applied to the trackpad region controls an operation of the device; and

a second mode of operation in which the touch input applied to the trackpad region does not control an operation of the device.

5. The device of claim 1 , wherein:

the input sensing system comprises a touch sensing system and a force sensing system; and

changing the mode of operation of the input sensing system comprises changing a force threshold of the force sensing system.

6. The device of claim 1 , wherein the hand presence sensing system comprises a capacitive sensor.

7. The device of claim 1 , wherein:

the display is a first display; and

the bottom case comprises a second display configured to display a virtual keyboard in the keyboard region of the glass top case.

8. A portable computer comprising:

a display portion comprising a display;

a base portion coupled to the display portion and configured to articulate relative to the display portion, the base portion comprising:

a bottom case;

a top case, formed from a dielectric material, coupled to the bottom case;

a keyboard; and

a trackpad region defined along a top surface of the top case;

an input sensing system configured to determine a location of a touch input applied to the trackpad region;

an optical sensing system configured to determine a location of a user's hand relative to the keyboard; and

a processing system operatively coupled to the optical sensing system and the input sensing system and configured to change a mode of operation of the input sensing system based at least in part on the location of the user's hand.

9. The portable computer of claim 8 , wherein the dielectric material is glass.

10. The portable computer of claim 8 , wherein the keyboard comprises a plurality of key mechanisms that move relative to the top case.

11. The portable computer of claim 8 , wherein the keyboard comprises a plurality of key regions defined along the top surface of the top case.

12. The portable computer of claim 8 , wherein the optical sensing system is configured to receive light through the dielectric material of the top case to determine the location of the user's hand relative to the keyboard.

13. The portable computer of claim 8 , wherein:

changing the mode of operation of the input sensing system comprises changing between a first mode of operation and a second mode of operation;

in the first mode of operation, the input sensing system is responsive to a touch input having a first input characteristic and applied to the trackpad region; and

in the second mode of operation, the input sensing system is not responsive to the touch input having the first input characteristic and applied to the trackpad region.

14. The portable computer of claim 8 , wherein changing the mode of operation of the input sensing system comprises changing a force threshold for registering the touch input.

15. A notebook computer comprising

a display portion comprising a display;

a base portion flexibly coupled to the display portion and comprising:

a bottom case; and

a glass top case coupled to the bottom case and defining, along an exterior surface of the glass top case:

a keyboard region; and

a trackpad region;

a hand presence sensing system configured to detect a presence of a user's hand over the keyboard region;

an input sensing system configured to determine a location of a touch event applied to a trackpad region of the glass top case and comprising a touch sensing system and a force sensing system; and

a processing system configured to, in response to a detection of the user's hand over the keyboard region, transition the input sensing system from a first mode of operation to a second mode of operation.

16. The notebook computer of claim 15 , wherein the second mode of operation is a palm rejection mode.

17. The notebook computer of claim 15 , wherein transitioning the input sensing system from a first mode of operation to a second mode of operation includes increasing a force threshold for detecting typing inputs applied to the glass top case.

18. The notebook computer of claim 15 , wherein the hand presence sensing system comprises:

an optical emitter configured to emit light through the glass top case; and

an optical detector configured to detect, through the glass top case, at least a portion of the emitted light.

19. The notebook computer of claim 18 , wherein the portion of the emitted light is reflected by the user's hand.

20. The notebook computer of claim 15 , wherein the hand presence sensing system comprises a capacitive sensor.