Dispersion liquid for electrophoretic display, display medium, and display device
There is provided a dispersion liquid for electrophoretic display, containing a dispersion medium 50 , a colored electrophoretic particle group 34 that is dispersed in the dispersion medium and migrates in the dispersion medium according to an electric field, a non-electrophoretic particle group 36 that is dispersed without migrating in the dispersion medium and has a color different from that of the electrophoretic particle group, and a compound having a neutral polar group and a hydrophobic group, which is contained in the dispersion medium in a ratio of about 0.01 to about 1 mass % based on the entire dispersion liquid.
1. A dispersion liquid for electrophoretic display, comprising:
a dispersion medium,
a colored electrophoretic particle group that is dispersed in the dispersion medium and migrates in the dispersion medium according to an electric field,
a non-electrophoretic particle group that is dispersed without migrating in the dispersion medium and has a color different from that of the electrophoretic particle group, and
a compound having a neutral polar group and a hydrophobic group, which is contained in the dispersion medium in a ratio of about 0.01 to about 1 mass % based on the entire dispersion liquid.
2. The dispersion liquid for electrophoretic display according to claim 1 ,
wherein the neutral polar group is a hydroxyl group, an alkyl ether group, a weak acid group neutralized with a weak base, or a weakly basic group neutralized with a weak acid group.
3. The dispersion liquid for electrophoretic display according to claim 1 ,
wherein a silicone-based oil is contained as the dispersion medium and the compound having a neutral polar group and a hydrophobic group has a siloxane bond-containing group as the hydrophobic group.
4. The dispersion liquid for electrophoretic display according to claim 1 ,
wherein a hydrocarbon-based oil is contained as the dispersion medium and the compound having a neutral polar group and a hydrophobic group has an alkyl group as the hydrophobic group.
5. A display medium comprising:
a pair of substrates disposed with spacing, at least either one of which has light transparency, and
the dispersion liquid for electrophoretic display according to claim 1 , which is enclosed between the pair of substrates.
6. A display medium comprising:
a pair of electrodes disposed with spacing, at least either one of which has light transparency, and
a region having the dispersion liquid for electrophoretic display according to claim 1 between the pair of electrodes.
7. A display device comprising:
the display medium according to claim 5 , and
an electric field applying unit that applies a voltage between the pair of substrates of electrodes of the display medium.
8. A display device comprising:
the display medium according to claim 6 , and
an electric field applying unit that applies a voltage between the pair of electrodes of the display medium.