Display Using Colored Dielectrophoretic and Electrophoretic Particles
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Solution Overview
Problem
Conventional dielectrophoretic displays suffer from poor display effects due to the limited color representation and adverse effects of black dielectrophoretic particles on white electrodes, leading to suboptimal visual performance.
Innovation Solution
Incorporating both dielectrophoretic and electrophoretic particles with different colors and dielectric constants into a display structure, where the particles move in response to electric fields to create pixel units that can display two specific colors in different operation states, enhancing the display effect by allowing clear representation of hybrid colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If black dielectrophoretic particles are used in conventional displays, then the particles can be easily distinguished from white electrodes, but the display effect is adversely affected when pixels are in the white state
Solution Approach 1:
The patent changes the color parameter of dielectrophoretic particles from black to colored particles (red, green, blue, yellow, cyan, or magenta) that match the corresponding color of electrodes. This parameter change resolves the contradiction by maintaining ease of manufacture while eliminating the adverse effect on display quality when pixels are in the white state.
Solution Approach 2:
The patent applies different color qualities to different components: colored dielectrophoretic particles are used with corresponding colored electrodes (red particles with red electrodes, green particles with green electrodes, etc.). This local quality differentiation ensures that particles are only visible when the pixel is in the colored state, not when it is in the white state, thereby resolving the display effect issue.
2Device complexity
If only single-color dielectrophoretic particles are used, then the display structure is simple, but the display effect and color representation are limited
Solution Approach 1:
The patent uses composite particle systems where colored dielectrophoretic particles are combined with colored electrophoretic particles in the same encapsulated volume. This composite approach enables dual-color or multi-color display capability, resolving the limitation of single-color representation while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent makes the particle system multi-functional by enabling pixels to display multiple colors (white and one or more colored states) using the same basic structure of encapsulated particles and electrodes. This multi-functionality resolves the contradiction by expanding color representation without proportionally increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of multiple particle types allows for improved display effects by enabling clear two-color representation in each pixel unit, surpassing the limitations of conventional technology by providing better visual performance.
Implementation Method 1
the dielectrophoretic particles 150 move towards an area where the intensity of the electric field E1 is low
Implementation Method 2
The electrophoretic particles are dispersed in the dielectric liquid. Each of the electrophoretic particles has a second color different from the first color
Data Source
AI summary
A display includes a first substrate, a partition element, a second substrate, a dielectric liquid, a plurality of dielectrophoretic particles and a plurality of electrophoretic particles. The partition element is disposed on the first substrate. The second substrate is disposed on the partition element. The partition element forms at least one accommodating room between the first substrate and the second substrate. The first substrate or the second substrate is adapted to forming an electric field in the accommodating room. The dielectric liquid is disposed in the accommodating room and has a first dielectric constant. The dielectrophoretic particles are dispersed in the dielectric liquid. Each of the dielectrophoretic particles has a first color and a second dielectric constant different from the first one. The electrophoretic particles are dispersed in the dielectric liquid. Each of the electrophoretic particles has a second color different from the first one. Another display is also provided.