US 12,474,757 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 Jun. 25, 2024, as Appl. No. 18/753,266.
Application 18/753,266 is a continuation of application No. 18/349,490, filed on Jul. 10, 2023, granted, now 12,050,499.
Application 18/349,490 is a continuation of application No. 16/806,780, filed on Mar. 2, 2020, granted, now 11,733,755, issued on Aug. 22, 2023.
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 2024/0345643 A1, Oct. 17, 2024
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)] 8 Claims
OG exemplary drawing
 
1. A method implemented by an integrated circuit, the method comprising:
controlling a stylus to operate in:
a first power mode in which components of the stylus for receiving signals from a sensor device are powered off and components of the stylus for transmitting signals to the sensor device are powered off;
a second power mode in which the components of the stylus for receiving drive signals transmitted wirelessly from the sensor device and used by the stylus to detect the sensor 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 sensor device are powered off; or
a third power mode in which the components of the stylus for receiving the drive signals transmitted wirelessly from the sensor 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 sensor device are powered on to transmit the stylus signals; and
in response to detecting the drive signals transmitted wirelessly from the sensor device, transitioning the stylus from the second mode to the third mode.