Dynamic Voltage Generation For Touch-Enabled Displays
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Abstract
The disclosed embodiments relate to a system that provides power for a touch-enabled display, wherein the touch-enabled display cycles between a display mode and a touch mode. During the display mode, the system drives a display-mode voltage to the touch-enabled display through a power output, wherein the power output is coupled through a display-mode capacitor CD to ground. Next, during a transition from the display mode to the touch mode, the system couples the power output through a touch-mode capacitor CT to ground, wherein CT was previously charged to a touch-mode voltage, which causes the power output to rapidly transition to the touch-mode voltage. Then, during the touch mode, the system drives the touch-mode voltage through the power output.
12 Citations
40 Claims
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1-20. -20. (canceled)
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21. A method for providing power for a touch-enabled display, comprising:
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during a display mode, driving a display-mode voltage through a power output to a display-mode capacitor CD and uncoupling a touch-mode capacitor CT from the power output; during a transition from the display mode to a touch mode, causing a voltage transition at both terminals of the touch-mode capacitor CT, at least one terminal of the display-mode capacitor CD, and the power output. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. An apparatus that provides power for a touch-enabled display, comprising:
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a display-mode capacitor CD coupled between a power output and ground; a touch-mode capacitor CT configured to be selectively coupled between the power output and the ground; and a controller for the touch-enabled display configured to cycle between the display mode and a touch mode, the controller configured to provide power to the touch-enabled display through the power output; during the display mode, the controller is configured to drive a display-mode voltage through the power output to the display-mode capacitor CD and uncouple the touch-mode capacitor CT from the power output; and during a transition from the display mode to the touch mode, the controller is configured to cause a voltage transition at both terminals of the touch-mode capacitor CT, at least one terminal of the display-mode capacitor CD, and the power output. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A touch-enabled display, comprising:
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a touch screen comprising a plurality of display pixels; a display system that updates the display pixels during a display mode; a touch sensing system that senses touches on the touch screen during a touch mode; a display-mode capacitor CD coupled between a power output and ground; a touch-mode capacitor CT configured to be selectively coupled between the power output and the ground; and a controller for the touch-enabled display, the controller configured to cycle between the display mode and the touch mode, the controller configured to provide power to the touch-enabled display through the power output; during the display mode, the controller is configured to drive a display-mode voltage through the power output to the display-mode capacitor CD and uncouple the touch-mode capacitor CT from the power output; and during a transition from the display mode to the touch mode, the controller is configured to cause a voltage transition at both terminals of the touch-mode capacitor CT, at least one terminal of the display-mode capacitor CD, and the power output. - View Dependent Claims (38, 39, 40)
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Specification