Mobile device display management

1. A method comprising:

determining, by a mobile device, that an object is proximate the mobile device using a proximity sensor of the mobile device, wherein the proximity sensor is configured to detect a presence of the object without any physical contact between the object and the mobile device, and wherein the proximity sensor detects when the object is within a threshold distance from the proximity sensor;

determining, by the mobile device, that an orientation of the mobile device is a first orientation;

after determining that the object is proximate the mobile device and that the orientation of the mobile device is the first orientation, automatically turning off a display of the mobile device; and

after turning off the display of the mobile device:

receiving, by the mobile device, one or more voice signals based on audible input received by a microphone of the mobile device,

determining, by the mobile device, that the object is not proximate the mobile device using the proximity sensor,

determining, by the mobile device, that the orientation of the mobile device is a second orientation, the second orientation being different from the first orientation, and

after determining that the object is not proximate the mobile device and that the orientation of the mobile device is the second orientation, automatically turning on the display of the mobile device.

2. The method of claim 1 , wherein the orientation of the mobile device is determined as approximately horizontal when an angle between a vector generally parallel to a major surface of the mobile device and a projection of the vector onto a plane that is generally perpendicular to a direction of gravity is less than or equal to approximately 50 degrees.

3. The method of claim 1 , wherein the orientation of the mobile device is determined as approximately vertical when an angle between a vector generally parallel to a major surface of the mobile device and a projection of the vector onto a plane that is generally perpendicular to a direction of gravity is greater than approximately 50 degrees.

4. The method of claim 1 , further comprising determining that the orientation of the mobile device is the second orientation for a threshold period of time before turning on the display.

5. The method of claim 1 , wherein determining that the object is not proximate the mobile device using the proximity sensor occurs before determining that the orientation of the mobile device is the second orientation.

6. The method of claim 1 , further comprising:

automatically turning off the display of the mobile device in response to at least one of determining that the object is proximate the mobile device a second time using the proximity sensor and determining that the orientation of the mobile device is the first orientation a second time.

7. The method of claim 1 , further comprising determining that the orientation of the mobile device is the first orientation for a threshold period of time before turning off the display.

8. The method of claim 1 , wherein determining that the orientation of the mobile device is the first orientation or the second orientation based on one or more signals generated by an accelerometer of the mobile device.

9. A mobile device comprising:

a display;

a microphone;

a proximity sensor configured to detect a proximity of an object to the mobile device, wherein the proximity sensor is configured to detect a presence of the object without any physical contact between the object and the mobile device, and wherein the proximity sensor detects when the object is within a threshold distance from the proximity sensor; and

one or more processors configured to:

after determining that the object is proximate the mobile device and that an orientation of the mobile device is a first orientation, automatically turn off the display of the mobile device;

after turning off the display:

receive one or more voice signals based on audible input received by the microphone,

determine that the object is not proximate the mobile device using the proximity sensor, and

determine that the orientation of the mobile device is a second orientation, the second orientation being different from the first orientation; and

after determining that the object is not proximate the mobile device and that the orientation of the mobile device is the second orientation, automatically turning on the display of the mobile device.

10. The mobile device of claim 9 , wherein the orientation of the mobile device is determined as approximately horizontal when an angle between a vector generally parallel to a major surface of the mobile device and a projection of the vector onto a plane that is generally perpendicular to a direction of gravity is less than or equal to approximately 50 degrees.

11. The mobile device of claim 9 , wherein the orientation of the mobile device is determined as approximately vertical when an angle between a vector generally parallel to a major surface of the mobile device and a projection of the vector onto a plane that is generally perpendicular to a direction of gravity is greater than approximately 50 degrees.

12. The mobile device of claim 9 , wherein the one or more processors are configured to determine that the orientation of the mobile device is the second orientation for a threshold period of time before turning on the display.

13. The mobile device of claim 9 , wherein the one or more processors are configured to determine that the orientation of the mobile device is the first orientation for a threshold period of time before turning off the display.

14. The mobile device of claim 9 , further comprising an accelerometer, wherein the one or more processors are configured to determine that the orientation of the mobile device is the first orientation or the second orientation based on one or more signals generated by the accelerometer.

15. A storage device storing instructions for causing at least one processor to:

automatically turn off a display of a mobile device after determining that an orientation of the mobile device is a first orientation and that an object is proximate the mobile device using a proximity sensor, wherein the proximity sensor is configured to detect a presence of the object without any physical contact between the object and the mobile device, and wherein the proximity sensor detects when the object is within a threshold distance from the proximity sensor;

after turning off the display:

receive one or more voice signals based on audible input,

determine that the object is not proximate the mobile device, and

determine that the orientation of the mobile device is a second orientation, the second orientation being different from the first orientation; and

after determining that the object is not proximate the mobile device and that the orientation of the mobile device is the second orientation, automatically turning on the display of the mobile device.

16. The storage device of claim 15 , wherein the orientation of the mobile device is determined as approximately horizontal when an angle between a vector generally parallel to a major surface of the mobile device and a projection of the vector onto a plane that is generally perpendicular to a direction of gravity is less than or equal to approximately 50 degrees.

17. The storage device of claim 15 , wherein the orientation of the mobile device is determined as approximately vertical when an angle between a vector generally parallel to a major surface of the mobile device and a projection of the vector onto a plane that is generally perpendicular to a direction of gravity is greater than approximately 50 degrees.

18. The storage device of claim 15 , wherein the one or more processors are configured to determine that the orientation of the mobile device is the second orientation for a threshold period of time before turning on the display.

19. The storage device of claim 15 , further storing instructions for causing the at least one processor to determine that the orientation of the mobile device is the second orientation for a threshold period of time before turning on the display.

20. The storage device of claim 15 , further storing instructions for causing the at least one processor to determine that the orientation of the mobile device is the first orientation for a threshold period of time before turning off the display.

21. The storage device of claim 15 , further storing instructions for causing the at least one processor to determine that the orientation of the mobile device is the first orientation or the second orientation based on one or more signals generated by an accelerometer of the mobile device.