Reflective Electrochromic Display with Black Visibility Control
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Solution Overview
Problem
Electrochromic devices face challenges in achieving improved black visibility and color representation due to complex methods of displaying black, which result in poor performance and complexity.
Innovation Solution
A reflective color display device is designed with electrochromatic layers that change color based on voltage, using electrochromatic materials that display colors in oxidation or reduction states, and a reflective layer to enhance visibility, including a structure with substrates, electrode layers, an electrolyte, and a counter redox layer to control charge changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrochromic devices use multiple color display units with light transmission and reflection methods, then color display capability is achieved, but black visibility is poor and device complexity increases
Solution Approach 1:
The patent changes the electrochemical state parameter of the electrochromic material between oxidized and reduced forms to control color display and black visibility. In the oxidized state, the material displays color; in the reduced state, it appears black. This parameter change enables simple control of black visibility without complex structural modifications.
Solution Approach 2:
The patent uses a composite electrochromic material system consisting of multiple electrochromic layers with different materials (e.g., tungsten oxide, nickel oxide, copper oxide) combined with specific electrolytes. This composite structure enables independent control of color display and black visibility while maintaining device simplicity.
2Reliability
If electrochromic materials are used to display colors through oxidation and reduction states, then color representation is improved, but control precision requirements increase
Solution Approach 1:
The patent divides the electrochromic layer into multiple sub-layers, each containing different electrochromic materials with distinct oxidation-reduction potentials. This segmentation allows independent voltage control for each layer, enabling precise color representation without requiring extremely high voltage control precision for the entire device.
Solution Approach 2:
The patent introduces specific electrolyte compounds (such as potassium hydroxide, sodium hydroxide, or ammonium hydroxide) as intermediaries that facilitate the oxidation-reduction reactions between the electrochromic materials and the applied voltage. These intermediaries enable smoother and more controllable color transitions, reducing the precision requirements for direct voltage control.
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 solution enables improved color and black visibility by allowing electrochromatic materials to switch between color and transparent states, facilitating clear color representation and gray scale control, thus simplifying the display process and enhancing performance.
Implementation Method 1
Electrochromism refers to a reversible color change due to an electric field direction in response to the application of a voltage. An electrochromic material refers to a material with optical characteristics that vary according to an electrochemical redox reaction.
Implementation Method 2
An electrochromic material refers to a material with optical characteristics that vary according to an electrochemical redox reaction
Implementation Method 3
a reflective layer disposed on the second electrode layer
Data Source
AI summary
A reflective color display may include a first electrode layer and a second electrode layer facing each other. An electrochromatic layer may be formed on the first electrode layer. The electrochromatic layer may include an electrochromatic material that is structured to display a color, to appear black, or to become transparent according to a voltage applied thereto. An electrolyte layer may contact the electrochromatic layer. The electrolyte layer may be located between the first electrode layer and the second electrode layer. A reflective layer may be disposed on the second electrode layer.