TOUCH DOWN DETECTION WITH A STYLUS

摘要

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.

主权项

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; andterminate the writing transmission mode based on detecting the pen-up status for a first pre-defined period.