1. A method of operating a touch screen, said method comprising: detecting, via capacitive sensing, a first object interaction with said touch screen while in a first doze mode to obtain a first detected object interaction, wherein said detecting while in said first doze mode is provided by one or more sensor electrodes that are also used for an active mode of capacitive sensing within a sensing region of said touch screen, and wherein said detecting while in said first doze mode is performed at a first duty cycle; determining, in said first doze mode, whether said first detected object interaction with said touch screen is a valid input object interaction with said touch screen and transitioning to a check input object validity mode, wherein an invalid orientation of said touch screen will invalidate said first detected object interaction and return to said first doze mode; in response to determining said first detected object interaction is an invalid input object interaction in said check input object validity mode, transitioning to a second doze mode; detecting, via capacitive sensing, a second object interaction with said touch screen while in the second doze mode to obtain a second detected object interaction, wherein said detecting while in said second doze mode is performed at a second duty cycle, said second duty cycle being less frequent than said first duty cycle; determining whether said second detected object interaction with said touch screen is said valid input object interaction with said touch screen and transitioning to the check input object validity mode; and in response to determining said second detected object interaction is said valid input object interaction in said check input object validity mode: transitioning from said check input object validity mode to a gesture recognition mode; and transitioning from said gesture recognition mode to said active mode in response to a determination of a valid gesture interaction by an object with said touch screen, wherein said gesture recognition mode is performed at a third duty cycle, said third duty cycle being the same as the first duty cycle and being different from said second duty cycle, and wherein said active mode comprises performing capacitive sensing at a fourth duty cycle, said fourth duty cycle being more frequent than said first duty cycle, said second duty cycle, and said third duty cycle.