| 主权项 |
1. A method of driving a display layer having a first, viewing surface and a second surface on the opposed side of the display layer from the first surface, the display layer being provided with means for applying an electric field between the first and second surfaces, the display layer further comprising an electrophoretic medium comprising a fluid and first, second, third and fourth types of particles dispersed in the fluid, the first, second, third and fourth types of particles having respectively first, second, third and fourth optical characteristics differing from one another, the first and third types of particles having charges of one polarity and the second and fourth types of particles having charges of the opposite polarity, the method comprising, in any order:
(i) applying a first electric field having a high magnitude and a polarity driving the first type of particles towards the viewing surface, thereby causing the display layer to display the first optical characteristic at the viewing surface; (ii) applying a second electric field having a high magnitude and a polarity driving the second type of particles towards the viewing surface, thereby causing the display layer to display the second optical characteristic at the viewing surface; (iii) when the second optical characteristic is displayed at the viewing surface, applying a third electric field having a low magnitude and a polarity driving the third type of particles towards the viewing surface, thereby causing the display layer to display the third optical characteristic at the viewing surface; and (iv) when the first optical characteristic is displayed at the viewing surface, applying a fourth electric field having a low magnitude and a polarity driving the fourth type of particles towards the viewing surface, thereby causing the display layer to display the fourth optical characteristic at viewing surface. |
