US 11,733,755 B2
Power management system for active stylus
Shahrooz Shahparnia, Campbell, CA (US); Trond Jarle Pedersen, Trondheim (NO); John Logan, Danville, CA (US); Vemund Kval Bakken, Menlo Park, CA (US); and Kishore Sundara-Rajan, San Jose, CA (US)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on Mar. 2, 2020, as Appl. No. 16/806,780.
Application 16/806,780 is a continuation of application No. 16/207,903, filed on Dec. 3, 2018, granted, now 10,579,120, issued on Mar. 3, 2020.
Application 16/207,903 is a continuation of application No. 13/329,270, filed on Dec. 17, 2011, granted, now 10,162,400, issued on Dec. 25, 2018.
Claims priority of provisional application 61/553,114, filed on Oct. 28, 2011.
Prior Publication US 2020/0201411 A1, Jun. 25, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 1/3203 (2019.01); G06F 3/0354 (2013.01); G06F 3/044 (2006.01)
CPC G06F 1/3203 (2013.01) [G06F 3/03545 (2013.01); G06F 3/0441 (2019.05); G06F 3/0442 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A stylus, comprising:
one or more electrodes; and
one or more computer-readable non-transitory storage media embodying logic for transmitting signals wirelessly to a device through a touch-sensor of the device;
the stylus having:
a first power mode in which components of the stylus for receiving signals from the device are powered off and components of the stylus for transmitting signals to the device are powered off;
a second power mode in which the components of the stylus for receiving drive signals transmitted by drive electrodes of the device and used by the stylus to detect the device are periodically switched between a powered on state and a powered off state at a first duty cycle and the components of the stylus for transmitting signals to the device are powered off; and
a third power mode in which the components of the stylus for receiving the drive signals transmitted by the drive electrodes of the device are powered on at a second duty cycle that is higher than the first duty cycle and the components of the stylus for transmitting stylus signals to the device are powered on to transmit the stylus signals;
wherein the stylus in the second mode, in response to detecting the drive signals transmitted by the drive electrodes of the device, transitions from the second mode to the third mode.