Electrowetting device and preparation method thereof

Abstract

The invention belongs to the field of electrowetting, and discloses an electrowetting device. The electrowetting device includes an upper substrate and a lower substrate; a cavity formed by the opposite upper and lower substrates is filled with encapsulation liquid; the upper substrate includes an upper support plate, a first electrode, a sealing plastic frame and support columns; the lower substrate includes a lower support plate, a second electrode, a hydrophobic insulation layer and a pixel wall. The invention further discloses a preparation method of the electrowetting device. According to the electrowetting device, the support column structure is arranged on the upper substrate, which is different from other electrowetting devices of which support columns are arranged on the lower substrate, the support column on the upper substrate can be subjected to several kinds of physical and chemical hydrophilic modifications, so that the support column achieves the conditions of super hydrophilicity and super oleophobicity, and therefore the influence of the support column on ink movement is greatly reduced.

Description

technical field [0001] The invention belongs to the field of electrowetting, in particular to an electrowetting device and a preparation method thereof. Background technique [0002] The basic structure of electrowetting display device is as follows figure 1 As shown, it is composed of two immiscible polar electrolyte liquids 4 and non-polar liquids 5 filled in the sealed cavity formed by the upper and lower substrates and the two substrates facing each other, wherein the upper substrate is composed of the upper support plate 1, the first The electrode 2 and the sealant frame 3 are composed, and the lower substrate is composed of a lower support plate 7 , a second electrode 8 , a hydrophobic insulating layer 9 and a pixel wall 6 . from figure 1 It can be seen from the structure that the non-polar liquid 5 is uniformly filled in the pixel grid enclosed by the pixel wall 6. Since the material of the pixel wall 6 is hydrophilic, the adjacent non-polar solution 5 is cut off by...

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Problems solved by technology

[0003] At present, LCD and other display processes often use inorganic or organic particles to support the device, but for electrowetting devices, if the particle support column is sprinkled into the ink 5 in the display area, the display effect will be affected, so it is not recommended use

In the electrowetting device, some patents propose that after the packaging is completed, in-situ polymerization is carried out by exposure to form the polymer support pillars, but in this way, all packaging processes of the device must be completed under yellow light conditions before in-situ polymerization. , and the hydrophilicity and hydrophobicity cannot be further improved

There is also a patent to prepare photoresist support pillars by secondary photolithography at the intersection of pixel walls, but the photoresist material limits the hydrophilicity and hydrophobicity of the support pillars, and the support pillars of this method cannot be further hydrophilic and hydrophobic. Modified, and the hydrophobic support column will attract ink, so the support column needs to have a very high hydrophilicity

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