Electrowetting element and fluid containing low amounts of water
An electrowetting element comprising a first fluid and a second fluid which are immiscible with each other and are switchable between a first configuration and a second configuration by changing a voltage applied to at least one of the first and second fluids, wherein less than or equal to 35 wt % of the second fluid is water and a balancing wt % of the second fluid comprises at least one non-aqueous component.
1. An electrowetting element comprising:
a first fluid comprising at least one of: an oil, an alkane, or a cyclic alkane;
a second fluid immiscible with the first fluid, comprising:
water, a wt % of the water of the second fluid greater than or equal to 0.5 wt % and less than or equal to 15 wt %, and
a balancing wt % of the second fluid comprising at least one component selected from the group consisting of:
a polyether,
a polyethylene glycol having the general formula:
wherein n is an integer,
a polyethylene glycol having the general formula:
wherein n is an integer and n=1 to 20, 1 to 15, 1 to 10, 1 to 5, or 1,
a peroxide,
a polymeric diethyl ether peroxide having the general formula:
wherein n is an integer,
a polymeric diethyl ether peroxide having the general formula:
wherein n is an integer and n=1 to 20, 1 to 15, 1 to 10, 1 to 5, or 1,
a polyol, a diol, ethylene glycol, propylene glycol, ethylene glycol substituted with at least one heteroatom, propylene glycol substituted with at least one heteroatom, a triol, glycerol, butanetriol, pentanetriol, a tetraol, erythritol, a derivative thereof, and a combination thereof; and
a support plate comprising:
an electrode, and
a surface, the first fluid and the second fluid switchable between a first configuration and a second configuration by changing a voltage applied to the electrode and the second fluid, the first fluid adjoining an area of the surface in the first configuration and the second fluid adjoining the area of the surface in the second configuration.
2. An electrowetting element according to claim 1 , wherein the wt % of the water of the second fluid is less than or equal to a maximum equilibrium hygroscopic amount of water.
3. An electrowetting element according to claim 1 , wherein the wt % of the water of the second fluid is at least one of:
greater than or equal to 1 wt %, or
greater than or equal to 1.5 wt %.
4. An electrowetting element according to claim 1 , wherein the wt % of the water of the second fluid is selected from the group consisting of: 2 to 15 wt %; 2.5 wt % to 15 wt %; 3 to 15 wt %; 4 to 15 wt %; and 5 to 15 wt %.
5. An electrowetting element according to claim 1 , wherein the wt % of the water of the second fluid is selected from the group consisting of: 0.5 to 10 wt %; 0.5 to 7.5 wt %; 0.5 to 7 wt %; 0.5 to 6.5 wt %; 0.5 to 6 wt %; 0.5 to 5.5 wt %; 0.5 to 5 wt %; 1 to 15 wt %; 1 to 10 wt %; 1 to 7.5 wt %; 1 to 7 wt %; 1 to 6.5 wt %; 1 to 6 wt %; 1 to 5.5 wt %; 1 to 5 wt %; 1.5 to 15 wt %; 1.5 to 10 wt %; 1.5 to 7.5 wt %; 1.5 to 7 wt %; 1.5 to 6.5 wt %; 1.5 to 6 wt %; 1.5 to 5.5 wt %; and 1.5 to 5 wt %.
6. An electrowetting element according to claim 1 , wherein the wt % of the water of the second fluid is selected from the group consisting of: 2 to 15 wt %; 2.5 to 15 wt %; 3 to 15 wt %; 3.5 to 15 wt %; 4 to 15 wt %; 4.5 to 15 wt %; 5 to 15 wt %; 5.5 to 15 wt %; 6 to 15 wt %; 6.5 to 15 wt %; 7 to 15 wt %; 7.5 to 15 wt %; 8 to 15 wt %; 8.5 to 15 wt %; 9 to 15 wt %; 9.5 to 15 wt %; 10 to 15 wt %; 10.5 to 15 wt %; 11 to 14 wt %; and 11.5 to 13 wt %.
7. An electrowetting element according to claim 1 , wherein the at least one component comprises at least one component with a general formula comprising at least two carbon atoms and at least one oxygen atom, a ratio of the at least one oxygen atom to the at least two carbon atoms being greater than 1:2.
8. An electrowetting element according to claim 1 , the second fluid further comprising at least one component selected from the group consisting of: an ether, dioxalane, dimethoxymethane, 1;1-dimethoxyethylene, an amide, a polyamide, a carboxylic acid, formic acid, acetic acid, propanoic acid, glycolic acid, a heteroatom substituted carboxylic acid, a halogenated carboxylic acid, chloroacetic acid, trifluoroacetic acid, a dicarboxylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, a tricarboxylic acid, citric acid, aconitric acid, an ester, methyl acetate, ethyl lactate, a sulphone, dimethyl sulphate, dimethyl sulphite, methylsulphonylmethane, an aldehyde, acetaldehyde, glyoxal, methylglyoxal, a peroxide, methyl ethyl ketone peroxide, oxamic acid, organosulphoxide, ethylene carbonate, propylene carbonate, diethylene glycol, a derivative thereof, and a combination thereof.
9. An electrowetting element according to claim 1 , wherein each of the at least one component independently has a general formula comprising at least two carbon atoms and at least one oxygen atom, a ratio of the at least one oxygen atom to the at least two carbon atoms being greater than 1:2.
10. An electrowetting element according to claim 1 , wherein the at least one component comprises:
a first component selected from the group consisting of: ethylene glycol, diethyleneglycol, polyethylene glycol, propylene glycol, dioxalane, glyoxal, citric acid, oxalic acid, oxamic acid, and formic acid, and
a second component different from the first component and selected from the group consisting of: erythritol, ethylene carbonate, propylene carbonate, ethylene glycol, glycerol, and butanetriol.
11. An electrowetting element according to claim 10 , wherein the balancing wt % of the second fluid comprises a ratio of a wt % of the first component to a wt % of the second component of substantially: 90:10, 80:20, 75:25, 70:30, 65:35, 60:40, 55:45, 50:50, 45:55, 40:60, 35:65, 30:70, 25:75, 20:80, or 10:90.
12. An electrowetting element according to claim 1 , wherein the first fluid comprises at least one dye,
the oil comprises silicone oil;
the alkane comprises: hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, or pentadecane; and
the cyclic alkane comprises decalin.
13. An electrowetting element according to claim 1 , wherein the second fluid has a surface tension of at least one of:
greater than 30,
greater than 35,
greater than 40, or
greater than 45 mN m −1 .
14. An electrowetting display device comprising:
an electrowetting element comprising:
a first fluid comprising at least one of: an oil, an alkane, or a cyclic alkane;
a second fluid immiscible with the first fluid, comprising:
water, a wt % of the water of the second fluid greater than or equal to 0.5 wt % and less than or equal to 15 wt %, and
a balancing wt % of the second fluid comprises at least one component selected from the group consisting of:
a polyether,
a polyethylene glycol having the general formula:
wherein n is an integer,
a polyethylene glycol having the general formula:
wherein n is an integer and n=1 to 20, 1 to 15, 1 to 10, 1 to 5, or 1,
a peroxide,
a polymeric diethyl ether peroxide having the general formula:
wherein n is an integer,
a polymeric diethyl ether peroxide having the general formula:
wherein n is an integer and n=1 to 20, 1 to 15, 1 to 10, 1 to 5, or 1,
a polyol, a diol, ethylene glycol, propylene glycol, ethylene glycol substituted with at least one heteroatom, propylene glycol substituted with at least one heteroatom, a triol, glycerol, butanetriol, pentanetriol, a tetraol, erythritol, a derivative thereof, and a combination thereof; and
a support plate comprising:
an electrode, and
a surface, the first fluid and the second fluid switchable between a first configuration and a second configuration by changing a voltage applied to the electrode and the second fluid, the first fluid adjoining an area of the surface in the first configuration and the second fluid adjoining the area of the surface in the second configuration;
a driver stage connected to the electrowetting element and configured to output to the electrowetting element the voltage applied to the electrode and the second fluid; and
a display controller connected to the driver stage and configured to output a signal to the driver stage for controlling the voltage output by the driver stage.
15. An electrowetting display device according to claim 14 , wherein the driver stage is configured to transform the signal output by the display controller to the voltage output by the driver stage.
16. An electrowetting display device according to claim 14 , wherein each of the at least one component independently has a general formula comprising at least two carbon atoms and at least one oxygen atom, a ratio of the at least one oxygen atom to the at least two carbon atoms being greater than 1:2.
17. An electrowetting display device according to claim 14 , wherein the at least one component comprises:
a first component selected from the group consisting of: ethylene glycol, diethyleneglycol, polyethylene glycol, propylene glycol, dioxalane, glyoxal, citric acid, oxalic acid, oxamic acid, and formic acid, and
a second component different from the first component and selected from the group consisting of: erythritol, ethylene carbonate, propylene carbonate, ethylene glycol, glycerol, and butanetriol.
18. An electrowetting display device according to claim 17 , wherein the balancing wt % of the second fluid comprises a ratio of a wt % of the first component to a wt % of the second component of substantially: 90:10, 80:20, 75:25, 70:30, 65:35, 60:40, 55:45, 50:50, 45:55, 40:60, 35:65, 30:70, 25:75, 20:80, or 10:90.
19. An electrowetting display device according to claim 14 , wherein the first fluid comprises at least one dye,
the oil comprises silicone oil;
the alkane comprises: hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, or pentadecane; and
the cyclic alkane comprises decalin.
20. An electrowetting display device according to claim 14 , wherein the wt % of the water of the second fluid is less than or equal to a maximum equilibrium hygroscopic amount of water.