Touch down detection with a stylus
First Claim
1. A device comprising:
- a tip that is sensitive to contact pressure;
a sensor configured to detect the contact pressure;
memory configured to store at least one pre-defined first threshold and a pre-defined second threshold on the contact pressure, wherein the first threshold defines tip state as one of a pen-up and a pen-down, wherein pressures below the first threshold defines pen-up and pressures above the first threshold define pen-down and the second threshold is below the first threshold;
a circuit configured to;
transmit in a hover transmission mode based on detecting pressures below the second threshold;
switch to an writing transmission mode based on detecting a pressure at or above the second threshold, wherein the writing transmission mode frame rate is higher than a hover transmission mode frame rate; and
terminate the writing transmission mode based on detecting the pen-up status for a first pre-defined period.
1 Assignment
0 Petitions
Accused Products
Abstract
A device includes a tip, a sensor, memory and a circuit. The tip is sensitive to contact pressure. The sensor detects the contact pressure. Memory stores at least one pre-defined first threshold and a pre-defined second threshold on the contact pressure. The first threshold defines tip state as one of a pen-up and a pen-down. Pressures below the first threshold defines pen-up and pressures above the first threshold define pen-down. The second threshold is below the first threshold. The circuit transmits in a hover transmission mode based on detecting pressures below the second threshold, switches to an writing transmission mode based on detecting a pressure at or above the second threshold and terminates the writing transmission mode based on detecting the pen-up status for a first pre-defined period. The writing transmission mode frame rate is higher than a hover transmission mode frame rate.
-
Citations
20 Claims
-
1. A device comprising:
-
a tip that is sensitive to contact pressure; a sensor configured to detect the contact pressure; memory configured to store at least one pre-defined first threshold and a pre-defined second threshold on the contact pressure, wherein the first threshold defines tip state as one of a pen-up and a pen-down, wherein pressures below the first threshold defines pen-up and pressures above the first threshold define pen-down and the second threshold is below the first threshold; a circuit configured to; transmit in a hover transmission mode based on detecting pressures below the second threshold; switch to an writing transmission mode based on detecting a pressure at or above the second threshold, wherein the writing transmission mode frame rate is higher than a hover transmission mode frame rate; and terminate the writing transmission mode based on detecting the pen-up status for a first pre-defined period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method comprising:
-
detecting pressure applied on a tip of a stylus; defining at least one first threshold configured to define tip state as one of a pen-up and pen-down, wherein pressures below the first threshold defines pen-up and pressures above the first threshold define pen-down; defining a second threshold below the first threshold; transmitting in a hover transmission mode based on detecting pressures below the second threshold; switching to an writing transmission mode based on detecting a pressure at or above the second threshold, wherein the writing transmission mode frame rate is higher than a hover transmission mode frame rate; and terminating the writing transmission mode based on detecting the pen-up status for a pre-defined period. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A method comprising:
-
detecting pen-up and pen-down events of a stylus; detecting timing between a pen-up event and a previous pen-down event; transmitting in a synchronization transmission mode based on detecting a pen-down event and based on the timing being above a defined threshold, wherein the synchronization transmission mode is defined by transmission of both an actual beacon signal and at least one dummy beacon signal per frame, wherein the actual beacon signal is configured to be synchronized with a refresh cycle of a digitizer system and wherein the dummy beacon signal includes or is accompanied by information related to timing of the actual beacon signal. - View Dependent Claims (19, 20)
-
Specification