Electrophoretic Smart Window Laminate With Reduced Diffraction
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Solution Overview
Problem
Existing smart windows are limited to two states (clear and black) and require costly color filters for full-color operation, with inefficient switching mechanisms that hinder commercial success due to high manufacturing costs and limited light transmission alteration.
Innovation Solution
A laminate with electrokinetic pixels comprising a transparent planar electrode, a second electrode separated by a clear foraminous insulating layer, and a third grid-like electrode, filled with colloidal dispersions of particles with opposite charges, allowing for various light transmissive states and color control through voltage manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If color filters are utilized for full-color operation, then color display capability is improved, but optical transmission is reduced by three times
Solution Approach 1:
The patent extracts the color filtering function from separate optical filters and integrates it directly into the electrophoretic particles themselves. Each particle type is synthesized with specific pigments (cyan, magenta, yellow, black) embedded in the polymer matrix, eliminating the need for external color filters and their associated light loss.
Solution Approach 2:
The patent applies local quality by giving different optical properties to different regions of the particle dispersion. By controlling which charged particles migrate to which electrode, specific color combinations are created locally at the display surface, enabling full-color operation without bulk color filters.
2Ease of operation
If conventional smart glass technologies are used, then light transmission control is achieved, but manufacturing cost increases significantly
Solution Approach 1:
The patent employs inexpensive electrophoretic particle formulations that can be manufactured using standard coating techniques. The particle dispersions use common polymers and pigments, avoiding costly electrochromic materials or precision mechanical components, thereby reducing manufacturing costs while maintaining functionality.
Solution Approach 2:
The patent replaces mechanical blind systems with an electrophoretic particle-based optical control system. Instead of physically moving blades or panels to block light, electrically charged particles migrate within the dispersion to control light transmission, eliminating mechanical complexity and reducing manufacturing costs.
3Productivity
If conventional electrophoretic displays are used, then binary switching is achieved, but color control capability is limited
Solution Approach 1:
The patent uses composite electrophoretic particles consisting of a polymer matrix embedded with multiple pigments (cyan, magenta, yellow, black). This composite structure allows particles to exhibit different colors based on their composition and arrangement, enabling full-color control while maintaining the fast switching characteristics of electrophoretic displays.
Solution Approach 2:
The patent creates a multi-functional electrophoretic system where the same particle dispersion can achieve multiple functions: binary switching, grayscale control, and full-color display. By controlling the voltage applied to different electrode regions, the system can dynamically adjust particle arrangement to achieve any desired color or transmission state.
4Ease of manufacture
If monochromal smart glass is used, then manufacturing simplicity is maintained, but functionality is limited
Solution Approach 1:
The patent merges multiple functional capabilities (color control, transmission control, privacy control) into a single electrophoretic particle dispersion system. By incorporating multiple charged particle types with different colors and densities in one dispersion, the system achieves multifunctionality without requiring separate layers or complex assembly processes.
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
Enables multispectral states, including color temperature control and privacy, with reduced manufacturing costs, enhancing the functionality and affordability of smart windows.
Implementation Method 1
a colloidal dispersion having two types of particles: the first type of particle having a first color and/or other optical property and a positive charge and a second type of particle having a second color and/or other optical property different from the first and a negative charge. By altering the polarity of the first, second and third electrodes, one can achieve a variety of different light transmissive states.
Implementation Method 2
By selecting the appropriate particle dispersion, one can provide a smart window which provides color temperature control or one which controls privacy, going from opaque to clear, or one that controls energy, going from opaque to infrared-absorbing.
Data Source
AI summary
A laminate which can serve as either a smart window or a smart mirror is formed using first and second substrates coated with transparent first and second electrodes which are separated by foraminous layer and a third grid-like linear electrode insulated from the first and second electrodes. The foraminous layer includes spacers defining a cell space which is filled with a colloidal ink having first and second particles. The first particles have a positive charge and a first color and second particles having a negative charge and a second color different from the first color. By altering the voltages of the first, second and third electrodes, one can achieve different light transmission characteristics which, for example, can alter the color temperature of the light transmitted through the laminate or enhance reflective colors.