Electrowetting hydrophobic dielectric layer, preparation method thereof, and electrowetting device

Abstract

The invention discloses an electrowetting hydrophobic dielectric layer, a preparation method thereof, and an electrowetting device. The electrowetting hydrophobic dielectric layer contains a hydrophobic fluorine-containing high-molecular material doped with inorganic oxide particles subjected to surface fluorination. Through surface fluorination of the inorganic oxide particles, the inorganic oxide particle surfaces are improved in hydrophobicity, stability and compatibility with hydrophobic fluorine-containing polymers, so that the fluorinated inorganic oxide particles can be evenly dispersed in the fluorine-containing high-molecular material without agglomeration. The fluorine-containing polymers doped with the inorganic oxide particles subjected to surface fluorination are prepared into the hydrophobic dielectric layer. The wetting performance of the fluorine-containing polymers is not affected, and the dielectric constant of the hydrophobic dielectric layer can be substantially improved. The insulating performance of a conventional electrowetting hydrophobic dielectric layer can also be significantly enhanced. By applying the hydrophobic dielectric layer to an electrowetting display, the breakdown problem of hydrophobic dielectric layers under the effect of repeated electric field can be improved.

Description

technical field [0001] The invention relates to the technical field of electrowetting display, in particular to an electrowetting hydrophobic dielectric layer, a preparation method thereof and an electrowetting device. Background technique [0002] The principle of electrowetting technology is to use an electrode covered with an insulating layer as the substrate of a conductive liquid. During the electrification process, the contact angle of the droplet on the substrate can be greatly changed. Therefore, in electrowetting technology, there are two factors that cannot be ignored, namely the contact angle hysteresis and the dielectric failure of the insulating layer. Droplets are affected by contact angle hysteresis as they move across a surface, similar to static friction between objects moving from rest to sliding. Hysteresis hinders droplet morphology changes and negatively affects microfluidic actuation performance. Under the action of electrolyte environment and repeate...

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Problems solved by technology

For inorganic oxide particles, compounds containing epoxy groups can react with the oxygen polar bonds on the surface to achieve the purpose of modification, and make them participate in the polymerization of the crosslinking system, thereby improving compatibility and dispersion, but electrowetting Wet hydrophobic dielectric layer materials are usually fluoropolymers with saturated main chains and no reactive groups, epoxy-based compounds will not play a role

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