CN-117709062-B - Pixel simulation model optimization method and modeling method of electrowetting display device

Abstract

The invention discloses a pixel simulation model optimizing method and modeling method of an electrowetting display device, which is characterized in that COMSOL software is utilized to build an electrowetting pixel unit simulation model, the motion condition of color ink in a pixel unit is simulated, guidance is provided for developing a new driving waveform through the color ink motion condition, in the electrowetting pixel unit, the color ink is considered to be an incompressible, impermeable, non-chemically reactive and Newton laminar model, PDE is used for building the color ink model, the color ink model is characterized by mass momentum balance, and the calculation precision of the simulation model is improved, and the method also comprises the step of setting grid mobility X for improving the coupling precision of a phase field and a laminar field in a physical field, so that the output fluid mass is conserved.

Inventors

• GAO YUMEI
• HE YIFENG
• CHI HUI
• WANG JIASHUAI
• YI ZICHUAN
• CHI FENG
• LIU LIMING
• Jiang Mouhua
• XU WANZHEN
• LONG ZHENGXING
• LI QIQI

Assignees

• 电子科技大学中山学院

Dates

Publication Date

20260508

Application Date

20231118

Claims (2)

1. 1. The pixel simulation model optimizing method of the electrowetting display device is characterized in that the method utilizes COMSOL software to establish a simulation model of an electrowetting pixel unit, simulates the movement condition of color ink in a pixel unit cell, provides guidance for developing a new driving waveform through the movement condition of the color ink, considers the color ink to be an incompressible, impermeable, non-chemically reactive and Newton laminar model in the electrowetting pixel unit, uses PDE to construct a color ink model, and the color ink model is characterized by mass momentum balance, and uses a continuity equation and a Naviger-Stokes equation as follows: , wherein, Is the density of the fluid which is to be measured, Is the velocity of the fluid and, Time is; , wherein, Is the pressure at which the pressure is applied, Is the adhesive force of the adhesive, the adhesive is coated on the surface of the adhesive, In order to combine the external force with the external force, Is an inertial force; The external force The formula is satisfied: , wherein, In the form of a surface tension force, Is the force of gravity which is the force of gravity, Is an electrostatic volumetric force; The electrostatic volumetric force The divergence of the maxwell stress tensor is calculated by the formula: , wherein, As tensors, the satisfied formula is: , wherein, For the strength of the electric field, In order to achieve the electric flux density, Is a matrix of units which is a matrix of units, Is constant, tensor in two-dimensional simulation model The matrix expression of (2) is: , wherein, Is the dielectric constant of the free space and, For the relative dielectric constant of the material, The electric field strength is the abscissa of the two-dimensional model, The electric field intensity is the ordinate of the two-dimensional model; The electrostatic volumetric force The calculation formula of (2) is as follows: ; The method includes setting grid mobility The grid mobility The formula is satisfied as follows: Wherein For the maximum speed of movement of the color ink, Is the surface tension coefficient.
2. 2. A method for modeling a pixel simulation model of an electrowetting display device, characterized in that the optimization method according to claim 1 is used, comprising the following steps: s1, establishing a geometric model, namely establishing a two-dimensional model aiming at color ink selection; S2, introducing material properties of a solving domain, wherein the material properties are added from a material library of COMSOL simulation software, the material comprises color ink, polar liquid, a pixel wall, substrate thickness, an indium tin oxide electrode and a hydrophobic insulating layer, the size of the color ink is 6 x 130um, the size of the polar liquid is 42 x 160um, the size of the pixel wall is 8 x 15um, the substrate thickness is 2x 160um, and in a discrete single pixel unit, the color ink, the polar liquid, the indium tin oxide electrode and the hydrophobic insulating layer form a stack structure; S3, defining a control function, namely adopting a continuity equation and a Navier-Stokes equation for optimizing and adjusting the simulation model; S4, setting boundary conditions, namely selecting a physical field, adding a laminar flow field, a phase field and coupling of an electrostatic field in the physical field, wherein the laminar flow field and the phase field jointly standardize the speed and deformation of liquid movement, the electrostatic field is an electric field provided by changing a contact angle, and grid mobility is adopted ; S5, planning mesh subdivision, namely selecting a low-density mesh shape; s6, solving the model, namely selecting a calculation model and solving an iterative algorithm to solve; s7, generating a report result, namely generating a two-dimensional drawing group, exporting a report, and exporting the setting process and the result into a PDF document.

Description

Pixel simulation model optimization method and modeling method of electrowetting display device Technical Field The invention relates to an electrowetting display technology, in particular to a pixel simulation model of an electrowetting display device. Background The electrowetting theory is a technology for controlling liquid to move by using an electric field, and the contact angle is changed by applying the electric field on the surface of a dielectric medium, so that the liquid moves directionally, deforms, splits and the like according to a certain rule, and the electrowetting display technology has the characteristics of millisecond response speed, rich display colors and high reflectivity. Electrowetting has great development potential as a new generation of display devices. However, the current research on the electrowetting two-dimensional simulation model is less, and the problems that the model precision is not high, the calculation result is not converged, the fluid quality is reduced, the calculation time is too long due to high-precision calculation and the like are commonly existed. This results in incomplete research on electrowetting. At present, a COMSOL software is adopted to build an electrowetting display pixel unit simulation model, and in the simulation process, a suggested value given by the COMSOL software is not applicable to electrowetting, for example, the default grid mobility X is 1 (m X s/kg), the grid mobility X is too large, so that interface motion cannot be captured correctly, the coupling precision of a phase field and a laminar flow field is low, and the overall fluid quality is seriously not conserved in the simulation process. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides a pixel simulation model optimization method and a modeling method of an electrowetting display device. The technical scheme adopted for solving the technical problems is as follows: A pixel simulation model optimization method of an electrowetting display device is characterized in that a COMSOL software is utilized to establish a simulation model of an electrowetting pixel unit, the motion condition of color ink in a pixel unit is simulated, guidance is provided for developing a new driving waveform through the color ink motion condition, in the electrowetting pixel unit, the color ink is considered to be an incompressible, impermeable, chemical reaction-free and Newton laminar model, a PDE is used to construct a color ink model, the color ink model is characterized by mass momentum balance, and the characterization is characterized by a continuity equation and a Navigator-Stokes equation, wherein the formula is as follows: , Where p is the fluid density, u is the fluid velocity, and t is the time; , Wherein, the Is the pressure at which the pressure is applied,Is adhesive force, F is external force,Is an inertial force; the sum force F satisfies the formula: Wherein F st is surface tension, pg is gravity, and F vf is electrostatic volume force; the electrostatic field volume force F vf is calculated by the divergence of Maxwell stress tensor, and the formula is as follows: Wherein Z ij is tensor, and the satisfying formula is: Wherein E is electric field intensity, D is electric flux density, I is an identity matrix, Z is a constant, and in the two-dimensional simulation model, the matrix expression of tensor Z ij is: Wherein, the Is the dielectric constant of the free space and,E x is the electric field intensity of the abscissa of the two-dimensional model, and E y is the electric field intensity of the ordinate of the two-dimensional model; the calculation formula of the electrostatic volume force F vf is as follows: 。 The method comprises setting a grid mobility X, wherein the grid mobility X meets the following formula: wherein V max is the maximum speed of movement of the color ink, Is the surface tension coefficient. A pixel simulation model modeling method of an electrowetting display device adopts the optimization method, and comprises the following steps: s1, establishing a geometric model, namely establishing a two-dimensional model aiming at color ink selection; S2, introducing material properties of a solving domain, wherein the material properties are added from a material library of COMSOL simulation software, the material comprises color ink, polar liquid, a pixel wall, substrate thickness, an indium tin oxide electrode and a hydrophobic insulating layer, the size of the color ink is 6 x 130um, the size of the polar liquid is 42 x 160um, the size of the pixel wall is 8 x 15um, the substrate thickness is 2x 160um, and in a discrete single pixel unit, the color ink, the polar liquid, the indium tin oxide electrode and the hydrophobic insulating layer form a stack structure; S3, defining a control function, namely adopting a continuity equation and a Navier-Stokes equation for optimizing and adjusting the simulation model; S4,