| 摘要 |
Power is conserved in a computing system by detecting when a user's hands are not placed over a keyboard for the computing system. When it is detected that the user's hand are not placed over the keyboard power to a display for the computing system is reduced. For example, the hands are detected by generating and detecting ultrasound waves. In one embodiment of the present invention, the ultrasound waves are generated and detected from positions on a case of the computing system so that when the user's hands are placed on the keyboard, the user's hands block a portion of the ultrasound waves from being detected. In another embodiment, the ultrasound waves are generated and detected from positions on a case of the computing system so that when the user's hands are placed on the keyboard, the user's hands reflect a portion of the ultrasound waves so that the portion of the ultrasound waves are detected./!
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