US 12,455,486 B2
Electrophoretic particle film having reduced diffraction in an open state
Donal Martin O'Keeffe, Clare (IE); and Brian D. Bean, Newton, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Sep. 27, 2022, as Appl. No. 17/953,386.
Claims priority of provisional application 63/248,593, filed on Sep. 27, 2021.
Prior Publication US 2023/0100320 A1, Mar. 30, 2023
Int. Cl. G02F 1/167 (2019.01); G02F 1/16755 (2019.01); G02F 1/1676 (2019.01)
CPC G02F 1/167 (2013.01) [G02F 1/16755 (2019.01); G02F 1/1676 (2019.01)] 24 Claims
OG exemplary drawing
 
1. An electrophoretic cell comprising:
a light transmissive substrate;
a first, light-transmissive electrode layer adjacent the light transmissive substrate;
a cell having walls and a bottom including a light transmissive apodization structure, the walls and bottom creating a volume;
a second electrode layer, wherein the cell is disposed between the first, light-transmissive electrode layer and the second electrode layer;
an electrophoretic medium including a solvent and a first set of charged pigment particles disposed in the volume of the cell; and
a bottom substrate, wherein the apodization structure comprises a plurality of serrations, and grooves there between, that define a plurality of capture volumes for the charged pigment particles.