US 12,406,632 B2
Continuous waveform driving in multi-color electrophoretic displays
Amit Deliwala, Andover, MA (US); and Sunil Krishna Sainis, Melrose, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Jul. 30, 2024, as Appl. No. 18/789,250.
Application 18/789,250 is a division of application No. 18/326,832, filed on May 31, 2023, granted, now 12,125,449.
Application 18/326,832 is a division of application No. 17/666,013, filed on Feb. 7, 2022, granted, now 12,131,713.
Claims priority of provisional application 63/147,465, filed on Feb. 9, 2021.
Prior Publication US 2024/0386857 A1, Nov. 21, 2024
Int. Cl. G02F 1/167 (2019.01); G02F 1/1676 (2019.01); G02F 1/1685 (2019.01); G09G 3/34 (2006.01)
CPC G09G 3/344 (2013.01) [G02F 1/167 (2013.01); G02F 1/1676 (2019.01); G02F 1/1685 (2019.01); G09G 2300/0842 (2013.01); G09G 2330/021 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for driving an electrophoretic medium comprising at least four types of particles, wherein each particle has a different optical property from each other, and each type of particle has a different combination of charge polarity and charge magnitude from each other, the method comprising:
providing a continuous driving waveform for at least 500 ms, wherein the continuous driving waveform has at least 16 unique voltage levels during the at least 500 ms, the continuous driving waveform has a rate of change measurable in V/ms and the time-dependent change in the rate of change is between −1V/ms2 and 1V/ms2.