US 11,934,593 B2
Sub-threshold addressing and erasing in a magneto-electrophoretic writing medium
Crystal Nguyen, Bedford, MA (US); Evan Griffith, Marlborough, MA (US); Seth J. Bishop, Framingham, MA (US); Stephen J. Telfer, Arlington, MA (US); Kosta Ladavac, Somerville, MA (US); Andrew A. Drabek, Belmont, MA (US); Sunil Krishna Sainis, Melrose, MA (US); Richard J. Paolini, Jr., Framingham, MA (US); and Samantha Morrill, Nashua, NH (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E Ink Corporation, Billerica, MA (US)
Filed on Feb. 21, 2023, as Appl. No. 18/111,960.
Application 18/111,960 is a continuation of application No. 17/543,833, filed on Dec. 7, 2021, granted, now 11,614,809.
Application 17/543,833 is a continuation of application No. 16/720,452, filed on Dec. 19, 2019, granted, now 11,221,685, issued on Jan. 11, 2022.
Claims priority of provisional application 62/789,239, filed on Jan. 7, 2019.
Claims priority of provisional application 62/784,301, filed on Dec. 21, 2018.
Prior Publication US 2023/0205329 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/0354 (2013.01); G02F 1/167 (2019.01); G02F 1/1673 (2019.01); G02F 1/1685 (2019.01); G06F 3/038 (2013.01)
CPC G06F 3/03545 (2013.01) [G02F 1/167 (2013.01); G02F 1/1673 (2019.01); G02F 1/1685 (2019.01); G06F 3/0383 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for erasing a magneto-electrophoretic medium including magneto-electrophoretic particles, the method comprising:
applying a magnetic field stimulus to the magneto-electrophoretic medium and simultaneously applying a sub-threshold voltage to the magneto-electrophoretic medium, thereby causing the magneto-electrophoretic medium to switch from a first state to a second state, the sub-threshold voltage being greater than zero but insufficient alone to cause the magneto-electrophoretic medium to switch from the first state to the second state within five seconds, wherein the sub-threshold voltage comprises a first time-varying waveform,
measuring a remnant voltage on the magneto-electrophoretic medium; and if an absolute value of the remnant voltage is higher than 0.3 V, modifying the first time-varying waveform to diminish the remnant voltage on the magneto-electrophoretic medium.