US 12,307,989 B2
Driving sequences to remove prior state information from color electrophoretic displays
Irina Paykin, Billerica, MA (US); Stephen J. Telfer, Arlington, MA (US); and Kenneth R. Crounse, Somerville, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Jul. 27, 2023, as Appl. No. 18/226,931.
Application 18/226,931 is a continuation of application No. 17/514,574, filed on Oct. 29, 2021, granted, now 11,756,494.
Claims priority of provisional application 63/108,713, filed on Nov. 2, 2020.
Prior Publication US 2023/0386421 A1, Nov. 30, 2023
Int. Cl. G09G 3/34 (2006.01); G02F 1/167 (2019.01); G02F 1/16757 (2019.01)
CPC G09G 3/344 (2013.01) [G02F 1/167 (2013.01); G02F 1/16757 (2019.01); G09G 2300/0842 (2013.01); G09G 2310/063 (2013.01); G09G 2310/068 (2013.01); G09G 2320/0204 (2013.01); G09G 2320/0242 (2013.01); G09G 2320/0252 (2013.01); G09G 2320/0257 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of driving an electrophoretic display including an electrophoretic medium having four different types of electrophoretic particles, each type of electrophoretic particle having a distinct color and a distinct combination of charge polarity and charge magnitude, the method comprising:
providing at least five voltage levels (VH, VH′, 0, VL′, and VL) to the electrophoretic medium, wherein VH and VH′ have polarities opposite to VL′, and VL, and wherein the magnitude of VH is greater than the magnitude of VH′, and wherein the magnitude of VL is greater than the magnitude of VL′;
providing a clearing pulse comprising a first set of at least three impulses of magnitude VH and length t3 that alternate with a second set of at least three impulses of magnitude VL′ and length t4;
providing a push-pull color addressing pulse having a push impulse of magnitude VL and length t5 and a pull impulse of magnitude VH and length t7, and
providing a DC balancing impulse, of magnitude VL′ and length t6, wherein the sum of the voltage-time areas of all of the positive voltage pulses is equal to the sum of the voltage-time areas of all of the negative voltage pulses, wherein the DC balancing pulse is between the push impulse and the pull impulse of the push-pull color addressing pulse.