Electrowetting technology

Electrowetting technology refers to a technique in the field of electronic paper display that changes the surface tension of liquid by applying voltage to achieve image display. It has developed in parallel with electrophoresis technology and is one of the core paths to promote the colorization of electronic paper.
In the context of the electronic paper industry, electrowetting technology isolates electrodes from liquids through dielectric layers (such as polymer films). When a voltage is applied, the contact angle of the droplets changes significantly, driving the movement of colored oil phases or pigment particles to form images. Unlike electrophoretic technology that relies on particle electrophoresis, electrowetting technology achieves display through liquid morphology changes. Its advantage lies in the ability to achieve higher refresh rates (such as 60Hz) and dynamic color display. Representative technologies such as Yuantai Technology's E Ink Marquee four-color system have been applied in industrial scenarios. The passive drive color video electronic paper pattern machine developed by the South China Normal University team and the G2.5 color dynamic electronic paper production line in Foshan, Guangdong have both made breakthroughs based on this technology.
From a technical perspective, electrowetting technology belongs to electrically driven microfluidic applications. Its principle is to use the double layer effect to change the interfacial tension of liquids, achieving directional movement or shape switching of droplets. In the field of electronic paper, this technology needs to address three core issues: dielectric material compatibility, liquid stability, and power consumption control. Compared to electrophoretic technology that relies on charged particles, electrowetting technology achieves smoother color transitions and higher dynamic ranges through the overall movement of liquid imaging. However, it still faces challenges such as color purity and flexible substrate compatibility in color display.
The current technological development presents three major directions: firstly, the integration with electrophoresis technology to develop color dynamic displays (such as Yuantai's Marquee system using a hybrid architecture of "electrophoresis+electrowetting"); The second is to evolve towards flexible display and integration, deeply integrating with touch and AIoT; The third breakthrough is in the field of large-sized commercial displays, with typical applications such as Chuanqi Optoelectronics' 75 inch mass production and Huike's 86 inch development. The maturity of future electro wetting technology will directly affect the competitiveness of electronic paper in high-frequency interactive scenarios (such as office creation) and large-scale commercial fields. Its technological breakthrough progress and industrial scale expansion will become key indicators for the transformation of the electronic paper industry from "static display" to "dynamic interaction".