Dynamic voltage generation for touch-enabled displays
First Claim
1. A method for providing power for a touch-enabled display, wherein the touch-enabled display cycles between a display mode and a touch mode, the method comprising:
- during the display mode, driving 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;
during a transition from the display mode to the touch mode, coupling the power output through a touch-mode capacitor CT to ground, wherein CT was previously charged to a touch-mode voltage, wherein coupling the power output through the touch-mode capacitor CT to ground causes 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; and
during the touch mode, driving the touch-mode voltage through the power output.
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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.
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Citations
24 Claims
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1. A method for providing power for a touch-enabled display, wherein the touch-enabled display cycles between a display mode and a touch mode, the method comprising:
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during the display mode, driving 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; during a transition from the display mode to the touch mode, coupling the power output through a touch-mode capacitor CT to ground, wherein CT was previously charged to a touch-mode voltage, wherein coupling the power output through the touch-mode capacitor CT to ground causes 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; and during the touch mode, driving the touch-mode voltage through the power output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus that provides power for a touch-enabled display, comprising:
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a controller for the touch-enabled display configured to cycle between a display mode and a touch mode, wherein the controller is configured to provide power to the touch-enabled display through a power output, wherein during the display mode, the controller drives a display-mode voltage through the power output, and during the touch mode, the controller drives the touch-mode voltage through the power output; a display-mode capacitor CD coupled between the power output and ground; and a touch-mode capacitor CT configured to be selectively coupled between the power output and ground; wherein during a transition from the display mode to the touch mode, the controller is configured to couple the power output through CT to ground, wherein CT was previously charged to a touch-mode voltage, wherein coupling the power output through the touch-mode capacitor CT to ground causes 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 (10, 11, 12, 13, 14, 15, 16)
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17. 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 controller for the touch-enabled display configured to cycle between the display mode and the touch mode, wherein the controller is configured to provide power to the touch-enabled display through a power output, wherein during the display mode, the controller is configured to drive a display-mode voltage through the power output, and during the touch mode, the controller is configured to drive the touch-mode voltage through the power output; a display-mode capacitor CD coupled between the power output and ground; and a touch-mode capacitor CT configured to be selectively coupled between the power output and ground; wherein during a transition from the display mode to the touch mode, the controller is configured to couple the power output through CT to ground, wherein CT was previously charged to a touch-mode voltage, wherein coupling the power output through the touch-mode capacitor CT to ground causes 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 (18, 19, 20, 21, 22, 23, 24)
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Specification