Electrochromic Display Device with Segmented Electrodes
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Solution Overview
Problem
Existing electrochromic display devices lack the ability to display fine patterns due to limitations in pixel size and shape adjustability, which restricts their versatility and visual performance.
Innovation Solution
An electrochromic display device is designed with a layered structure comprising a first substrate, a second substrate, an electrolyte layer, first transparent electrodes, second transparent electrodes, a first electrochromic layer made of inorganic material, and a second electrochromic layer made of organic material, where the second electrodes extend in a specific direction and are separated, allowing for adjustable pixel size and shape, and the inclusion of a porous structure with adsorbed organic material enhances color switching capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional electrochromic display structure is used, then the device structure is simple, but the pixel size and shape cannot be adjusted to display fine patterns
Solution Approach 1:
The display device is divided into multiple independent unit pixels, where each unit pixel can be independently controlled through separate transparent electrodes. This segmentation enables fine pattern display by adjusting the size and shape of individual pixels while maintaining overall device functionality.
Solution Approach 2:
The patent introduces a dual-electrode configuration where first transparent electrodes extend in a first direction and second transparent electrodes extend in a second direction perpendicular to the first. This dimensional arrangement allows independent control of pixel dimensions in both directions, enabling adjustable pixel size and shape for fine pattern display.
2Reliability
If a single electrochromic layer is used, then the device structure is simple, but the color switching capability and contrast ratio are limited
Solution Approach 1:
The patent employs a composite structure with both inorganic electrochromic material (tungsten oxide) and organic electrochromic material in separate electrochromic layers. This combination leverages the advantages of both material types to achieve superior color switching capability and high contrast ratio while maintaining device reliability.
Solution Approach 2:
Different electrochromic materials are used in different layers to optimize specific functions: the inorganic tungsten oxide layer provides stable electrochromic response and high contrast, while the organic electrochromic layer enhances color switching capability. This local optimization of material properties improves overall device performance.
3Manufacturing precision
If transparent electrodes are not patterned, then the manufacturing process is simple, but fine patterns cannot be displayed
Solution Approach 1:
The transparent electrodes are patterned into multiple separate units corresponding to individual pixels or pixel groups. This segmentation enables fine pattern display by controlling the transparency of specific electrode regions, while the patterning process uses standard photolithography techniques to maintain manufacturing feasibility.
Solution Approach 2:
The patterned transparent electrodes provide dynamic control over light transmission in different regions of the display. By applying voltage to specific electrode patterns, the device can dynamically create and modify fine patterns, enhancing display flexibility while using conventional fabrication methods.
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 fine pattern display capabilities with high contrast ratio and efficient color switching, offering improved outdoor visibility and adaptability through independent voltage control of unit pixels, enabling the creation of various visual patterns.
Implementation Method 1
Electrochromism refers to the phenomenon that materials are reversibly colored or bleached in response to electrochemical oxidation or reduction reactions of chromic materials
Implementation Method 2
Electrochromism refers to the phenomenon that materials are reversibly colored or bleached in response to electrochemical oxidation or reduction reactions of chromic materials
Implementation Method 3
Electrochromism refers to the phenomenon that materials are reversibly colored or bleached in response to electrochemical oxidation or reduction reactions of chromic materials
Implementation Method 4
the second electrochromic layer may further include a porous structure containing metal oxide, and the organic electrochromic material may be adsorbed in the porous structure
Data Source
AI summary
Provided is an electrochromic display device including: a first substrate; a second substrate on the first substrate; an electrolyte layer disposed between the first substrate and the second substrate; a first transparent electrode provided between the electrolyte layer and the first substrate; second transparent electrodes provided between the electrolyte layer and the second substrate; a first electrochromic layer provided between the first transparent electrode and the electrolyte layer; and a second electrochromic layer provided between the second transparent electrodes and the electrolyte layer, wherein the second transparent electrodes each extend in a first direction and be disposed apart from each other in a second direction perpendicular to the first direction, the second electrochromic layer extends between the second transparent electrodes and contacts a lower surface of the second substrate, the first electrochromic layer includes an inorganic electrochromic material, and the second electrochromic layer includes an organic electrochromic material.