Appearance-Modifying Device with Dynamic Particle Control
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Solution Overview
Problem
Existing appearance-modifying devices, such as electrophoretic display devices, are not suitable for surfaces that need to convey information as they cannot be switched to a transparent state, limiting their applicability when the surface must remain visible, especially when active.
Innovation Solution
An appearance-modifying device using optically transparent substrates with a spacer structure and electrodes to control the distribution of particles within cells, allowing the device to switch between a dispersed state and a transparent state by concentrating particles near the electrodes, thereby maximizing transparency and enabling color control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrophoretic display devices are used to modify appearance, then appearance customization is enabled, but the surface cannot be switched to transparent state
Solution Approach 1:
The patent applies dynamics by enabling the appearance-modifying device to switch between static states (dispersed particle state for appearance modification and concentrated particle state for transparency). The particles can be dynamically redistributed between these states through electric field control, allowing the surface to transition between opaque and transparent conditions as needed.
Solution Approach 2:
The patent utilizes parameter changes by altering the distribution concentration of particles within the fluid medium. By changing the particle concentration parameter from uniform dispersion to localized concentration near electrodes, the optical properties of the surface are modified, enabling transitions between transparent and opaque states while maintaining appearance customization capability.
2Adaptability or versatility
If particles are dispersed throughout the fluid to modify appearance, then appearance customization is achieved, but transparency is reduced
Solution Approach 1:
The patent applies local quality by concentrating particles in specific localized regions near the electrodes rather than distributing them uniformly throughout the entire fluid volume. This creates regions of high particle density (near electrodes) and regions of low particle density (bulk fluid), allowing appearance modification in localized areas while maintaining transparency in other areas.
Solution Approach 2:
The patent segments the fluid medium into distinct functional zones: a particle-concentrated region near the electrodes and a particle-dispersed region in the bulk fluid. This segmentation allows different optical properties to coexist within the same device, enabling both appearance modification and transparency simultaneously in different spatial locations.
3Illumination intensity
If the surface must remain visible when inactive, then transparency is required, but appearance customization is limited
Solution Approach 1:
The patent enables dynamic switching between transparency and appearance customization modes. When the surface needs to remain visible, the particles are concentrated near the electrodes, creating a transparent state. When appearance customization is needed, the particles are dispersed throughout the fluid, creating an opaque but customizable state. This dynamic adaptability allows the surface to meet different requirements as needed.
Solution Approach 2:
The patent utilizes parameter changes in particle distribution to switch between transparency and appearance customization modes. By changing the particle concentration parameter from localized (transparent state) to dispersed (customization state), the surface can adapt its optical properties to match different operational requirements, maintaining visibility when needed while enabling customization when required.
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 achieves high transparency and efficient appearance modification by maximizing the fraction of the area that can be evacuated of particles, allowing for effective use on surfaces that require visibility, such as displays, while maintaining the ability to alter appearance as needed.
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 (10; 30), for modifying the visual appearance of a surface covered thereby, comprising: first (11) and second (12) oppositely arranged optically transparent substrates; a spacer structure (13; 32) spacing apart the first (11) and second (12) substrates in such a way that a space between the first (11) and second (12) substrates is divided into a plurality of cells (15, 16; 31a-c). The appearance-modifying device further has, in each cell (15, 16; 31a-c), an optically transparent fluid (19) having a plurality of particles (20) dispersed therein, the particles being moveable in the fluid (19) through application of an electric field; and first (17a, 18a; 33) and second (17b, 18b; 32) electrodes arranged to simultaneously, by application of a voltage across the electrodes, control a distribution of the particles (20) within each of a plurality of the cells (15, 16; 31a-c) from a first, dispersed state in which an appearance of the surface covered by the appearance-modifying device is determined by optical properties of the particles (20), to a second state in which the particles (20) are concentrated adjacent to at least one of the first (17a, 18a; 33) and second (17b, 18b; 32) electrodes in such a way that the appearance-modifying device (10; 30) becomes optically transparent.