ACTIVE STYLUS SYNCHRONIZATION
First Claim
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.
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Accused Products
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.
30 Citations
20 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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 correlation between the synchronization pulse sequence received and a facsimile of the synchronization pulse sequence; and synchronize a local row counter of the sensory logic with a remote row counter of the capacitive touch screen based on the correlation. - View Dependent Claims (17, 18, 19)
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20. 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