Active stylus synchronization
First Claim
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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 establish a timing scheme shared between the active stylus and 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 the shared timing scheme, 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 establish a timing scheme shared between the active stylus and 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 the shared timing scheme.
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Citations
19 Claims
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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 establish a timing scheme shared between the active stylus and 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 the shared timing scheme, 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:
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 establish a timing scheme shared between the active stylus and 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 the shared timing scheme, including computing a correlation between a strongest excitation pulse received and a facsimile of the excitation pulse. - View Dependent Claims (16, 17)
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18. 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; compute a synchronization pulse-sequence correlation between the synchronization pulse sequence received and a facsimile of the synchronization pulse sequence; establish a timing scheme shared between the active stylus and 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 the shared timing scheme based on the excitation-pulse correlation. - View Dependent Claims (19)
Specification