In-Plane Electrophoretic Appearance Modification
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Solution Overview
Problem
Existing appearance-modifying devices, such as those using electrophoretic display devices, are not suitable for surfaces that need to convey information and require high drive voltages, limiting their applicability and efficiency.
Innovation Solution
An appearance-modifying device with a configuration of optically transparent substrates and particles dispersed in a fluid, where the particles are controllable through an electric field, allowing for in-plane switching and efficient distribution between concentration sites on the substrates, enabling flexible and transparent appearance modification with reduced voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrophoretic display devices are used to modify appearance, then appearance customization is achieved, but drive voltage becomes too high (5-15V)
Solution Approach 1:
The patent transitions from conventional vertical electrophoretic display architecture to an in-plane switching architecture where particles move laterally within the plane of the substrate rather than vertically. This dimensional change allows for appearance modification using lower voltages while maintaining the customization capability.
Solution Approach 2:
The patent modifies the operating parameters of the electrophoretic system by implementing in-plane particle movement instead of vertical movement, changing the electric field orientation and particle transport mechanism. This parameter change reduces the required drive voltage from 5-15V to lower levels while preserving appearance modification functionality.
2Ease of manufacture
If electrophoretic display devices cover a surface, then appearance modification is achieved, but the surface cannot convey information clearly when display is inactive
Solution Approach 1:
The patent applies appearance modification locally through in-plane particle concentration patterns rather than uniformly across the entire surface. This allows different regions to have different optical properties, enabling the surface to simultaneously convey information in active regions while maintaining modifiability in other areas.
Solution Approach 2:
The patent implements dynamic particle redistribution within the plane of the substrate, allowing the surface to transition between different appearance states. This dynamic in-plane switching enables the surface to maintain information visibility by adjusting particle locations rather than blocking the entire surface.
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 device effectively modifies the appearance of surfaces with improved robustness and reduced voltage needs, allowing for transparent states and multiple color states, while maintaining clarity on information-conveying surfaces.
Implementation Method 1
an optically transparent fluid having a plurality of particles dispersed therein, the particles being moveable in the fluid through application of an electric field
Data Source
AI summary
An appearance-modifying device for modifying the visual appearance of a surface covered thereby, the device comprising a first substrate, a second substrate, a spacer structure spacing apart the first and second substrates in such a way that a space between the first and second-substrates is divided into a plurality of cells wherein in each cell, an optically transparent fluid having a plurality of particles is dispersed therein, wherein each of the cells is configured such that a distribution state of the particles is controllable in a first distribution state and an appearance of the surface covered by the appearance-modifying device is determined by optical properties of the particles and a second distribution state in which the particles are concentrated onto one of a first particle concentration site and a second particle concentration site.