Input devices incorporating biometric sensors

1. A laptop computing device comprising:

an upper portion comprising a display;

a hinge;

a lower portion coupled to the upper portion by the hinge; and

a keyboard coupled to the lower portion and comprising a set of depressible keys including a depressible power button comprising:

a cap comprising a sapphire sheet defining an upper exposed surface of the depressible power button that extends across an entirety of the depressible power button, the upper exposed surface configured to receive a touch input and a press input;

a grounding element positioned below the sapphire sheet and configured to function as a non-contact ground in response to the touch input;

a biometric sensor positioned below the sapphire sheet and configured to detect the touch input;

a compressible switch positioned below the biometric sensor and configured to detect the press input; and

a spring element positioned below the cap and configured to resist movement of the cap in response to the touch input and deform in response to the press input.

2. The laptop computing device of claim 1 , wherein the biometric sensor is a capacitive sensor configured to detect a fingerprint of a user in response to the touch input to the cap.

3. The laptop computing device of claim 2 , wherein:

the laptop computing device is configured to authorize a function in response to the touch input corresponding to a touch by an authorized user; and

the laptop computing device is configured to change a power state in response to the press input.

4. The laptop computing device of claim 2 , wherein the biometric sensor is positioned between the cap and the spring element.

5. The laptop computing device of claim 1 , wherein the upper exposed surface of the cap is substantially planar.

6. The laptop computing device of claim 1 , wherein:

the depressible power button comprises a frame positioned between the spring element and the cap; and

the frame operates as a grounding element for the biometric sensor.

7. The laptop computing device of claim 6 , wherein:

the frame defines an opening;

the biometric sensor is positioned at least partially within the opening; and

the cap is positioned on an upper surface of the frame.

8. The laptop computing device of claim 6 , wherein the frame comprises one or more standoffs that support the cap.

9. A laptop device comprising:

an upper portion comprising a display;

a lower portion coupled to the upper portion; and

a depressible power button coupled to the lower portion and comprising:

a ceramic cap defining a substantial entirety of an upper exposed surface of the depressible power button;

a spring plate positioned below the ceramic cap and configured to maintain the ceramic cap in an undepressed position in response to a first user input and deform in response to a second user input that moves the ceramic cap from the undepressed position and to a depressed position;

a frame positioned between the ceramic cap and the spring plate and configured to operate as a non-contact grounding element for the depressible power button; and

a biometric sensor positioned between the ceramic cap and the spring plate and configured to obtain biometric data in response to the first user input.

10. The laptop device of claim 9 , wherein the biometric sensor is configured to detect at least a portion of a fingerprint of a user contacting the ceramic cap.

11. The laptop device of claim 10 , wherein the biometric sensor comprises a capacitive sensor configured to detect the portion of the fingerprint through the ceramic cap.

12. The laptop device of claim 10 , wherein the biometric sensor comprises an optic sensor configured to detect an image of the portion of the fingerprint through the ceramic cap.

13. The laptop device of claim 9 , wherein:

the frame defines an opening; and

the biometric sensor is positioned at least partially within the opening.

14. A laptop computing device comprising:

an upper portion comprising a display;

a lower portion coupled to the upper portion; and

a power button positioned within a recess in the lower portion and comprising:

a cap defining an entirety of an exposed upper surface of the power button and configured to move between an undepressed position and a depressed position;

a frame positioned below the cap and configured to operate as a non-contact grounding element in response to a user touch to the cap;

a spring positioned below the cap and coupled to the lower portion;

a biometric sensor positioned between the cap and the spring and configured to detect a fingerprint of a user through the cap; and

a compressible switch positioned below the biometric sensor and between the cap and the spring; wherein:

in response to a touch input, the spring is configured to resist movement of the cap and maintain the cap in the undepressed position and detect the fingerprint of the user; and

in response to a press input, the spring is configured to bend to allow the cap to move to the depressed positioned and the compressible switch is configured to detect the movement of the cap.

15. The laptop computing device of claim 14 , wherein:

the cap comprises a sapphire material that defines the entirety of the exposed upper surface; and

the exposed upper surface is substantially planar.

16. The laptop computing device of claim 14 , wherein:

the frame defines an opening; and

the biometric sensor is positioned at least partially within the opening of the frame.