A polar fluid for an electrowetting display and an electrowetting display

Abstract

The invention discloses a polar fluid for an electrowetting display and an electrowetting display. The polar fluid for an electrowetting display includes 90-100 parts by mass of ionic liquid and 0-10 parts by mass of Surfactant, the contact angle of the ionic liquid on the surface of the dielectric material is greater than 90 degrees, using the polar fluid provided by the invention is beneficial to the color development of the electrowetting display, and has high conductivity, strong hydrophilicity and electrowetting Response to excellent merits.

Description

technical field [0001] The invention relates to the field of polar conductive fluid, in particular to a polar fluid for an electrowetting display and an electrowetting display. Background technique [0002] Electrowetting display is based on the macroscopic light and dark changes caused by the contact angle of droplets on the surface of hydrophobic materials in response to the electric field. An electrowetting display is generally composed of an upper plate, a lower plate, and a polar fluid and a non-polar fluid encapsulated in a plastic frame. The lower plate is composed of a first substrate, a first electrode layer, an insulating layer, a hydrophobic layer and The pixel wall is formed, and the upper plate includes a second substrate and a second electrode layer. Polar fluids and non-polar fluids are immiscible. Non-polar fluids are mostly long-chain alkanes or silicone oils in which dyes are dissolved. Currently, the commonly used polar fluids are water or aqueous solutio...

AI Technical Summary

Problems solved by technology

However, some physical properties of water limit its application. For example, because of the low conductivity of water, when water is used as the polar phase of electrowetting devices, the device driving voltage is high.

Although the introduction of ions by the addition of inorganic salts improves the conductivity of the solution, thereby reducing the driving voltage, but at the same time increases the corrosion of the electrode layer of the device.

In addition, the patent (CN201080043651) published on August 4, 2010 proposed other types of polar solvents as the polar phase of electrowetting devices, such as alcohols, ethers, esters, etc., but the conductivity of such fluids is generally relatively low. Poor, it is necessary to add substances with ion dissociation ability to improve the conductivity, and it is required that such substances will not cause corrosion to the electrode, so the optional substances to improve conductivity are very limited

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