Digitizer, stylus and method of synchronization therewith
First Claim
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1. A method for operating a digitizer with an autonomous stylus, the method comprising:
- autonomously transmitting a signal burst at a defined rate by a stylus in accordance with a transmission repeat cycle of the stylus, wherein the transmission repeat cycle of the stylus is asynchronous with a refresh cycle of a digitizer and wherein the duration of the transmission repeat cycle is predefined and known to the digitizer;
sampling outputs of a digitizer sensor, wherein the digitizer sensor is sampled over a plurality of chunk sampling periods, wherein the plurality of chunk sampling periods are sampling periods separated by periods wherein the digitizer sensor is not sampled, and wherein positioning of each of the plurality of chunk sampling periods is staggered with respect to the refresh cycle of the digitizer;
determining one chunk sampling period over which a signal burst transmitted from the stylus is detected;
determining a timing of signal bursts transmitted by the stylus over subsequent refresh cycles based on subsequent output sampled in a corresponding time vicinity of the one chunk sampling period at times responsive to the duration of the transmission repeat cycle; and
synchronizing the refresh cycle of the digitizer with the transmission repeat cycle of the stylus in accordance with the timing of the signal bursts.
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Abstract
A method for operating a digitizer with an autonomous asynchronous stylus includes sampling outputs from a digitizer, detecting from the outputs at least one pulsed signal transmitted from an autonomous asynchronous stylus at a defined rate, determining a location of the stylus interaction with respect to the digitizer, and tracking stylus interaction with the digitizer over subsequent pulsed signals transmitted from the stylus.
77 Citations
37 Claims
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1. A method for operating a digitizer with an autonomous stylus, the method comprising:
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autonomously transmitting a signal burst at a defined rate by a stylus in accordance with a transmission repeat cycle of the stylus, wherein the transmission repeat cycle of the stylus is asynchronous with a refresh cycle of a digitizer and wherein the duration of the transmission repeat cycle is predefined and known to the digitizer; sampling outputs of a digitizer sensor, wherein the digitizer sensor is sampled over a plurality of chunk sampling periods, wherein the plurality of chunk sampling periods are sampling periods separated by periods wherein the digitizer sensor is not sampled, and wherein positioning of each of the plurality of chunk sampling periods is staggered with respect to the refresh cycle of the digitizer; determining one chunk sampling period over which a signal burst transmitted from the stylus is detected; determining a timing of signal bursts transmitted by the stylus over subsequent refresh cycles based on subsequent output sampled in a corresponding time vicinity of the one chunk sampling period at times responsive to the duration of the transmission repeat cycle; and synchronizing the refresh cycle of the digitizer with the transmission repeat cycle of the stylus in accordance with the timing of the signal bursts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A digitizer system operated with an autonomous stylus comprising:
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a digitizer sensor that receives signals; an autonomous asynchronous stylus that autonomously transmits signal bursts at a defined rate, the defined rate defining a transmission repeat cycle of the stylus, wherein the transmission repeat cycle of the stylus is asynchronous with a refresh cycle of the digitizer sensor, and wherein the duration of the transmission repeat cycle is predefined and known to the digitizer; a controller associated with the digitizer sensor for sampling the digitizer sensor; and a processor associated with the digitizer sensor to detect a signal burst transmitted from the stylus for determine a timing of the signal burst detected; the controller further adapted to synchronize subsequent refresh cycles of the digitizer with the transmission repeat cycle of the stylus based on the determined timing of the detected signal bursts, wherein the controller samples the digitizer over a plurality of chunk sampling periods, wherein the plurality of chunk sampling periods are sampling periods separated by periods wherein the digitizer is not sampled, and wherein positioning of each of the plurality of chunk sampling periods is staggered with respect to the refresh cycle of the digitizer; and wherein the processor determines one chunk sampling period over which a signal burst transmitted from the stylus is detected and determines a timing of signal bursts transmitted by the stylus over subsequent refresh cycles based on subsequent output sampled in a corresponding time vicinity of the one chunk sampling period in the refresh cycle at times responsive to the duration of the transmission repeat cycle. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification