FAST TOUCH DETECTION IN A MUTUAL CAPACITIVE TOUCH SYSTEM
First Claim
Patent Images
1. A method for touch detection in a touch panel, the method comprising:
- entering a low power touch detection mode;
intermittently, stimulating the touch panel with signals to determine if any touch event occurs on the touch panel without locating the touch event on the touch panel; and
if a touch event is detected, entering a full scan mode to locate the touch event on the touch panel;
otherwise,if no touch event is detected, entering a low power idle mode for a predetermined time.
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Abstract
A method for touch detection in a touch panel display includes entering a low power touch detection mode and intermittently stimulating the touch panel display with signals to determine if any touch event occurs without locating the touch event on the touch panel. If a touch event is detected, a full scan mode is entered to locate the touch event on the touch panel. This provides both faster touch detection and lower power operation for the touch panel display and controller circuit.
92 Citations
19 Claims
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1. A method for touch detection in a touch panel, the method comprising:
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entering a low power touch detection mode; intermittently, stimulating the touch panel with signals to determine if any touch event occurs on the touch panel without locating the touch event on the touch panel; and if a touch event is detected, entering a full scan mode to locate the touch event on the touch panel;
otherwise,if no touch event is detected, entering a low power idle mode for a predetermined time. - View Dependent Claims (2, 3, 4, 5)
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6. A method for a touch panel, the method comprising:
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when no touch activity is detected for the touch panel, periodically performing a touch detection scan of the touch panel; and when the touch detection scan produces an indication of touch activity, performing a full scan of the touch panel to locate the position of the touch activity on the touch panel. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A touch panel controller circuit comprising:
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an analog front end to stimulate selected rows of a touch panel and sense panel response to the stimulation; and a scan controller coupled with the analog front end and configured to control the analog front end to periodically stimulate predetermined rows of the touch panel with a touch detection scan procedure and, in response to an indication of no touch activity, enter low power mode and intermittently stimulate the predetermined rows of the touch panel with subsequent touch detection scans until a touch activity has been detected. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification