Electrophoretic display element, electrophoretic display device, and electronic apparatus
View Patent ↗An electrophoretic display element includes: a cell containing first and second electrophoretic particles mutually oppositely charged with positive and negative polarities; and first and second electrode sections disposed opposite to each other across the cell in a viewing direction of the cell, wherein the first electrode section includes first and second electrodes whose application voltages are individually controlled, and the second electrode section includes third and fourth electrodes whose application voltages are individually controlled.
1. A method of controlling an electrophoretic display element, the electrophoretic display element including a cell containing first electrophoretic particles charged with one of positive polarity and negative polarity and second electrophoretic particles charged with another of the positive polarity and the negative polarity, and a first electrode section and a second electrode section disposed opposite to each other across the cell in a viewing direction of the cell, the first electrode section including a first electrode and a second electrode, and the second electrode section including a third electrode and a fourth electrode, the method comprising:
individually controlling application voltages applied to the first electrode section and the second electrode section by applying a pattern of voltages to the first electrode, the second electrode, the third electrode and the fourth electrode such that all of the first electrophoretic particles electrophoretically move within the cell in a first path in a direction along the viewing direction, and all of the second electrophoretic particles electrophoretically move within the cell in a second path different from the first path in a direction opposite to the viewing direction.
2. The method according to claim 1 , wherein the pattern of voltages includes at least three different voltage application states.
3. The method of claim 1 , wherein
the first path passes through a first space within the cell held between a pair of the first electrode and the third electrode, and
the second path passes through a second space within the cell held between a pair of the second electrode and the fourth electrode.
4. The method of claim 3 , wherein
the first electrode is provided in a peripheral region of the first electrode section,
the third electrode is provided in a peripheral region of the second electrode section,
the second electrode is provided in a central region of the first electrode section, and
the fourth electrode is provide in a central region of the second electrode section.
5. The method of claim 4 , wherein
surfaces of the first electrophoretic particles are hydrophilic, and
an inner wall surface of the cell belonging to a first space is hydrophilic.
6. The method of claim 5 , wherein
surfaces of the second electrophoretic particles being hydrophobic, and
an inner wall surface of the cell belonging to a second space being hydrophobic.
7. The method of claim 1 , wherein
the first electrophoretic particles being first colored particles corresponding to one of primary colors in additive color mixing or subtractive color mixing, and
the second electrophoretic particles being second colored particles in a complementary relation with the first colored particles.
8. The method of claim 7 , wherein
the cell further includes white particles,
the white particles having a polarity identical with the polarity of the second electrophoretic particles, and
the white particles having a smaller charge amount than that of the first electrophoretic particles and second electrophoretic particles.
9. The method of claim 1 , wherein
a control of shifting voltage application timings upon applications of voltages to different electrodes belongs to the same electrode section.