Stylus for operating a digitizer system
AssigneeMicrosoft Technology Licensing, LLC
InventorsAhia Peretz, On Haran
Life of this patent
Estimating the term…
Abstract
A handheld device includes a conductive tip configured to interact with a capacitive based digitizer sensor, an active transmission module, a reflective transmission module, a switch configured to connect the conductive tip to one of the active transmission module and the reflective transmission module and a controller configured to toggle position of the switch. The active transmission module configured to generate a first signal on the conductive tip independent from a drive signal transmitted on the digitizer sensor. The reflective transmission module is configured to generate a second signal on the conductive tip based on the drive signal transmitted on the digitizer sensor and picked by the conductive tip during interaction with the digitizer sensor.
Claims14
A handheld device comprising:
- a conductive tip configured to pick up a charge based on a drive signal transmitted on a digitizer sensor over a pre-defined duration;
- a first circuit comprising:
- an amplifier configured to convert the charge on the conductive tip to voltage;
- and
- a signal detector configured to detect output from the amplifier and to extract parameters of the output;
- a second circuit comprising:
- a signal generator configured to generate a signal based on the parameters extracted;
- and
- a booster configured to boost the signal generated with an amplitude based on the parameters extracted to be transmitted via the conductive tip;
- a switch configured to connect one of the first circuit and the second circuit to the conductive tip;
- and
- a controller configured to toggle position of the switch a plurality of times during the pre-defined duration.
A method for controlling a stylus, the method comprising:
- detecting a charge on a conductive tip of the stylus from a driver line;
- extracting a signal upon the detected charge being above a defined threshold, amplitude, frequency and phase;
- imposing a delay representing a phase shift for a control signal to be transmitted from the conductive tip to a digitizer sensor;
- and
- generating a tip signal based on a frequency and phase of the detected charge, the tip signal transmitted to the conductive tip through a booster.
Dependencies are inferred from the claim text.