Electrostatic communication using an active stylus
First Claim
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1. An active stylus comprising:
- an electrode; and
a controller configured to
1) generate a report including stylus information represented by a plurality of bits including a first subset of bits having a lower priority against transmission error and a second subset of bits having a higher priority against transmission error,
2) encode the first subset of bits differently than the second subset of bits, such that the first subset of bits has a higher data transmission rate than the second subset of bits to reduce a size of the report, and
3) excite the electrode with a carrier signal to form an electrostatic communication channel, the carrier signal being modulated to transmit the report via the electrostatic communication channel.
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Abstract
An active stylus includes an electrode and a controller. The controller is configured to 1) generate a report including stylus information represented by a plurality of bits including a first subset of bits and a second subset of bits, 2) encode the first set of bits differently than the second set of bits to reduce a size of the report, and 3) excite the electrode with a carrier signal to form an electrostatic communication channel, the carrier signal being modulated to transmit the report via the electrostatic communication channel.
19 Citations
20 Claims
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1. An active stylus comprising:
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an electrode; and a controller configured to
1) generate a report including stylus information represented by a plurality of bits including a first subset of bits having a lower priority against transmission error and a second subset of bits having a higher priority against transmission error,
2) encode the first subset of bits differently than the second subset of bits, such that the first subset of bits has a higher data transmission rate than the second subset of bits to reduce a size of the report, and
3) excite the electrode with a carrier signal to form an electrostatic communication channel, the carrier signal being modulated to transmit the report via the electrostatic communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An active stylus comprising:
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an electrode; and a controller configured to
1) generate a report including stylus information,
2) encode the report using a plurality of encoding schemes such that different portions of the report that are encoded using different encoding schemes have different data transmission rates to reduce a size of the report, where the different portions of the report have different priorities against transmission error, and where portions having higher priority against transmission error are encoded using a first encoding scheme having a first data transmission rate and portions having lower priority against transmission error are encoded using a second encoding scheme having a higher data transmission rate than the first data transmission rate, and
3) excite the electrode with a carrier signal to form an electrostatic communication channel, the carrier signal being modulated to transmit the report via the electrostatic communication channel. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A system comprising:
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an active stylus including, a transmit electrode, and a stylus controller; and a display device including, a touch sensor including a plurality of receive electrodes, and a display controller, wherein the stylus controller is configured to
1) generate a report including stylus information,
2) encode the report using a plurality of encoding schemes such that different portions of the report that are encoded using different encoding schemes have different data transmission rates to reduce a size of the report, where the different portions of the report have different priorities against transmission error, and where portions having higher priority against transmission error are encoded using a first encoding scheme having a first data transmission rate and portions having lower priority against transmission error are encoded using a second encoding scheme having a higher data transmission rate than the first data transmission rate, and
3) excite the transmit electrode with a carrier signal to form an electrostatic communication channel with one or more receive electrodes of the touch sensor of the display device, the carrier signal being modulated to transmit the report to the display device, andwherein the display controller is configured to
1) identify a receive electrode of the plurality of receive electrodes having a greatest capacitance between the receive electrode and the transmit electrode,
2) combine a signal of the identified receive electrode with signals of a plurality of receive electrodes proximate to the receive electrode to produce a combined signal, and
3) decode the combined signal to extract the report from the combined signal. - View Dependent Claims (18, 19, 20)
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Specification