The electrophoretic display is a display technology that utilizes the principle that the charged colloidal particles can move in the electric field, and realizes the alternate color display by the movement of the charged substance between the electrodes under the electric field. The electrophoresis unit is such that one electrophoresis unit is one pixel. Dimension matrix arrangement is performed to form a flat display, and pixels can display different colors according to requirements, and the combination can obtain a flat image. The electrophoretic display mainly includes Twisting Ball Display (TBD) technology, Microencapsulated Electrophoretic Display (MED) technology, Microcup electrophoretic display technology, and Reverse Emulsion Electrophoretic Display. , REED) technology, etc. This article refers to the address: http:// 1.1 Technical principles The torsion sphere electrophoresis display is filled in an oil-filled liquid in a sealed chamber of transparent plastic. The black and white two-color spherical particles are separated in the liquid, the white hemisphere reflects light, and the black hemisphere absorbs incident light. The loading electric field is controlled by the yttrium oxide tin electrode and the driving circuit. Under the action of the pulse voltage, due to the torque force of the dipole, the small ball rotates in the liquid to realize the display, and the rotation angle and the arrangement of the sphere are adjusted by the driving voltage. Order degree, control image grayscale. By improving the manufacturing equipment and process, the composition of the ball can be changed such that the black and white two-color spherical particles become colored transparent multi-colored spherical particles. It is also possible to make full transparent spherical particles and implant a translucent filter on the hemispherical cut surface. Thus, when the color filter is in a state perpendicular to the plane of the display screen, the ball is invisible, and when the color filter is parallel to the plane of the display screen, the color of the color filter appears, and a color display is possible. The microcapsule electrophoresis display first encapsulates the electrophoretic particles and the insulating suspension in the microcapsules, and then places the microcapsules between the electrodes. A microcapsule is dispersed with a plurality of positively charged white particles and a negatively charged black particle. The positive and negative electric particles are distributed in the transparent liquid in the microcapsule, that is, in the dispersion medium. When a positive electric field is added from the non-display, micro The positively charged white particles in the capsule move and accumulate on the display surface, which is displayed in gray. Conversely, when a negative electric field is applied from the non-display surface, the negatively charged black particles move and gather on the display surface, which appears to be black. As shown in Figure 3 below. These particles are controlled by the electric field positioning, i.e., where the color is displayed is controlled by an electric field, and the control electric field is generated by the bottom plate with the high resolution display array. Color electrophoretic display is realized by adding a color filter film, controlling the electrophoresis speed, and adding sub-pixels. 1.2 advantages of electrophoresis technology as a flexible display Electrophoretic display has the advantages of easy readability, softness, bistable characteristics and low power consumption, and has become the focus of people's attention. Compared with flat panel displays, it has the following characteristics: (1) Using flexible conductive polymer thin film transistors (Thin Film transistnr) as an electrode, the physical and mechanical properties are similar to traditional paper, can be curled or even folded, easy to carry; (2) mainly reflective display, the reflection of light conforms to the Lambertian law of reflection, has a large viewing angle; (3) the image The display is bi-stable display, that is, the display is realized under the condition of applying an electric field, and after the electric field is removed, the display is still maintained, thereby having an information storage function and saving energy. 1.3 technical difficulties At present, almost all electrophoretic display technologies are immature, and the response speed is relatively slow. It is used as a flexible display for the following problems: unable to express enough coherent video images, because electrophoresis technology relies on the motion of particles, and the switching time for display is very long. Up to several hundred milliseconds, this speed is not enough for video applications. Electrophoresis technology should be developed for electrophoretic display to achieve switching times of tens of milliseconds or even faster; full color display technology needs to be further improved; manufacturing process is complicated , high requirements on materials and high cost. Electrophoretic display technology is still in the research stage, development and application has just started, and there are still many scientific and technical problems to be solved. We should seize the opportunity to track the latest international research and development trends in this field, grasp the core scientific issues of the subject, select suitable materials or synthesize new advanced materials in combination with material functionalization issues, and provide theoretical basis for the design of high performance electrophoretic display materials. . At the same time, solve the technical problems of each step in industrialization.
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