Active stylus synchronization
First Claim
Patent Images
1. A touch-sensing system comprising:
- an active stylus including a probe electrode and associated sensory logic;
the sensory logic configured to;
receive a synchronization pulse sequence via the probe electrode between consecutive touch-sensing frames of a capacitive touch screen;
use the synchronization pulse sequence to synchronize a local row counter of the sensory logic to a remote row counter of the capacitive touch screen;
receive an excitation pulse via the probe electrode within a given touch-sensing frame; and
use the excitation pulse to maintain synchronization between the local row counter and the remote row counter, including computing a correlation between a strongest excitation pulse received and a facsimile of the excitation pulse.
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Abstract
A touch-sensing system comprises an active stylus including a probe electrode and associated sensory logic. The sensory logic is configured to receive a synchronization pulse sequence via the probe electrode between consecutive touch-sensing frames of a capacitive touch screen, to use the synchronization pulse sequence to synchronize a local row counter of the sensory logic to a remote row counter of the capacitive touch screen, to receive an excitation pulse via the probe electrode within a given touch-sensing frame, and to use the excitation pulse to maintain synchronization between the local row counter and the remote row counter.
34 Citations
19 Claims
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1. A touch-sensing system comprising:
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an active stylus including a probe electrode and associated sensory logic; the sensory logic configured to; receive a synchronization pulse sequence via the probe electrode between consecutive touch-sensing frames of a capacitive touch screen; use the synchronization pulse sequence to synchronize a local row counter of the sensory logic to a remote row counter of the capacitive touch screen; receive an excitation pulse via the probe electrode within a given touch-sensing frame; and use the excitation pulse to maintain synchronization between the local row counter and the remote row counter, including computing a correlation between a strongest excitation pulse received and a facsimile of the excitation pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A touch-sensing system comprising:
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an active stylus including a probe electrode and associated sensory logic; the sensory logic configured to; receive a synchronization pulse sequence via the probe electrode between consecutive touch-sensing frames of a capacitive touch screen; compute a synchronization-pulse correlation between the synchronization pulse sequence received and a facsimile of the synchronization pulse sequence; synchronize a local row counter of the sensory logic with a remote row counter of the capacitive touch screen based on the synchronization pulse-sequence correlation, including locating a position corresponding to a maximum value of the synchronization-pulse correlation and/or identifying a first occurrence of an above-threshold position in the synchronization-pulse correlation; receive an excitation pulse via the probe electrode within a given touch-sensing frame; compute an excitation-pulse correlation between the excitation pulse received and a facsimile of the excitation pulse; and maintain synchronization between the local row counter and the remote row counter based on the excitation-pulse correlation. - View Dependent Claims (16, 17, 18)
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19. A touch-sensing system comprising:
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an active stylus including a probe electrode and associated sensory logic; the sensory logic configured to; receive a synchronization pulse sequence via the probe electrode between consecutive touch-sensing frames of a capacitive touch screen; compute a synchronization pulse-sequence correlation between the synchronization pulse sequence received and a facsimile of the synchronization pulse sequence; synchronize a local row counter of the sensory logic to a remote row counter of the capacitive touch screen based on the synchronization pulse-sequence correlation; receive an excitation pulse via the probe electrode within a given touch-sensing frame; compute an excitation-pulse correlation between the excitation pulse received and a facsimile of the excitation pulse; and maintain synchronization between the local row counter and the remote row counter based on the excitation-pulse correlation.
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Specification