Colored fluids for electrowetting, electrofluidic, and electrophoretic technologies
First Claim
1. A colored fluid for electrowetting, electrofluidic, or electrophoretic devices comprising:
- at least one non-aqueous polar solvent having (a) a dynamic viscosity of 0.1 cP to 50 cP at 25°
C., (b) a surface tension of 25 dynes/cm to 55 dynes/cm at 25°
C., and (c) an electrowetting relative response of 40% to 80%; and
at least one colorant selected from a pigment and/or a dye.
1 Assignment
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Accused Products
Abstract
Colored fluids for electrowetting, electro fluidic, or electrophoretic devices, and the devices themselves, are disclosed. The colored fluid can include a nonaqueous polar solvent having (a) a dynamic viscosity of 0.1 cP to 50 cP at 250 C, (b) a surface tension of 25 dynes/cm to 55 dynes/cm at 250 C, and (c) an electrowetting relative response of 40% to 80%. Such colored fluids further include a colorant selected from a pigment and/or a dye. In another embodiment, the colored fluid can include a non-polar solvent and an organic colorant selected from a pigment and/or a dye. Such colored fluids can be black in color and have a conductivity from 0 pS/cm to 5 pS/cm and a dielectric constant less than 3. The use of the colored fluids offers improvements in reliability, higher levels of chroma in the dispersed state, and the ability to achieve higher contrast ratios in display technologies.
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Citations
21 Claims
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1. A colored fluid for electrowetting, electrofluidic, or electrophoretic devices comprising:
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at least one non-aqueous polar solvent having (a) a dynamic viscosity of 0.1 cP to 50 cP at 25°
C., (b) a surface tension of 25 dynes/cm to 55 dynes/cm at 25°
C., and (c) an electrowetting relative response of 40% to 80%; andat least one colorant selected from a pigment and/or a dye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A pixel for a display, the pixel comprising:
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a reservoir; a colored fluid in the reservoir, the colored fluid including at least one non-aqueous polar solvent having (a) a dynamic viscosity of 0.1 cP to 50 cP at 25°
C., (b) a surface tension of 25 dynes/cm to 55 dynes/cm at 25°
C., and (c) an electrowetting relative response of 40% to 80%, and at least one colorant selected from a pigment and/or a dye; anda plurality of electrodes configured to apply a potential difference effective to move the colored fluid relative to at least one of the electrodes.
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Specification