US 11,688,357 B2
Disaggregation driving sequences for four particle electrophoretic displays
Ning-Wei Jan, New Taipei (TW); Chen-Kai Chiu, Taoyuan (TW); Feng-Shou Lin, Tainan (TW); and Chih-Yu Cheng, Taipei (TW)
Assigned to E Ink California, LLC, Fremont, CA (US)
Filed by E Ink California, LLC, Fremont, CA (US)
Filed on Apr. 28, 2022, as Appl. No. 17/731,497.
Claims priority of provisional application 63/181,514, filed on Apr. 29, 2021.
Prior Publication US 2022/0351691 A1, Nov. 3, 2022
Int. Cl. G09G 3/34 (2006.01)
CPC G09G 3/344 (2013.01) [G09G 2320/0242 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of driving a display layer disposed between a viewing surface including a light-transmissive electrode and a second surface on the opposed side of the display layer from the viewing surface, the second surface including a driving electrode, the display layer including an electrophoretic medium comprising a fluid and first, second, third and fourth types of particles dispersed in the fluid,
wherein the first, second, third and fourth types of particles have respectively first, second, third, and fourth optical characteristics differing from one another, the first and third types of particles having charges of a first polarity and the second and fourth types of particles having charges of a second polarity, opposite the first polarity, and the first and third types of particles do not have the same charge magnitudes, and the second and fourth types of particles do not have the same charge magnitudes, the method comprising the following steps in order:
(i) applying a first electric field having a high magnitude and the first or second polarity to drive the first or second types of particles towards the viewing surface, thereby causing the display layer to display the first or second optical characteristic at the viewing surface;
(ii) applying a second electric field having the high magnitude and a negative polarity;
(iii) applying a shaking pulse including at least four periods of the high magnitude electric field at the first polarity and at least four periods of the high magnitude electric field at the second polarity;
(iv) applying a third electric field having the high magnitude and the same polarity as step (i) to again drive the first or second types of particles towards the viewing surface, thereby causing the display layer to again display the first or second optical characteristic at the viewing surface;
(v) applying a fourth electric field having a low magnitude and a polarity opposite to step (iv) to drive the fourth or third types of particles towards the viewing surface, thereby causing the display layer to display the fourth or third optical characteristic at the viewing surface,
wherein a rest period of no electric field is performed after step (iii), and steps (i)-(iii) are repeated a second time before completing steps (iv) and (v).