Electrochromic Material Core-Shell Structure for Low Voltage Response
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Solution Overview
Problem
Current electrochromic materials for transparent display devices have limitations such as low transmittance, reduced contrast ratio, and inability to block infrared rays effectively, requiring additional films and suffering from slow response speed and high driving voltage requirements.
Innovation Solution
Development of an electrochromic material with a core-shell structure, where the shell includes a chemical formula with bipyridinium salt moieties and electron-rich halogen-substituted phenyl or phenoxy groups, enhancing transmittance, response speed, and light blocking efficiency, and integrating this material into a transmittance variable panel and display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inorganic electrochromic material (WO3, MoO3, Nb2O5, TiO2, or Ta2O5) is used, then the electrochromic effect is achieved, but the response speed is slow and high driving voltage is required
Solution Approach 1:
The patent changes the chemical composition parameters of the electrochromic material from inorganic oxides to organic compounds containing bipyridinium salt moieties and electron-rich halogen-substituted phenyl or phenoxy groups. This parameter change in material composition fundamentally alters the electrochemical properties, enabling faster response speed and lower driving voltage requirements while maintaining the electrochromic effect.
Solution Approach 2:
The patent employs composite material design by combining specific functional groups (bipyridinium salt moieties with electron-rich halogen-substituted phenyl or phenoxy groups) to create an organic electrochromic material that integrates both high-speed response and low-voltage operation characteristics, overcoming the limitations of conventional inorganic materials.
2Object-affected harmful factors
If inorganic electrochromic material is used, then the electrochromic effect is achieved, but additional infrared cut film is required
Solution Approach 1:
The organic electrochromic material designed in the patent performs multiple functions simultaneously: it provides the primary electrochromic effect for transmittance control and also exhibits infrared ray blocking capability. This multi-functionality eliminates the need for separate infrared cut films, reducing device complexity while addressing both visible light control and infrared radiation management requirements.
Solution Approach 2:
The patent merges the electrochromic function and infrared blocking function into a single organic material system. The organic electrochromic material with specific molecular structure (containing bipyridinium salt and electron-rich halogen-substituted phenyl or phenoxy groups) inherently provides both visible light modulation and infrared absorption, combining multiple protective functions into one component.
3Illumination intensity
If transparent display device is used, then the transparency is achieved, but the contrast ratio and visibility are reduced due to lack of black state
Solution Approach 1:
The patent utilizes color change properties of the organic electrochromic material to achieve a black state in the display device. When voltage is applied, the material undergoes electrochemical transformation that absorbs visible light, creating a black appearance. This enables the transparent display to switch between transparent and black states, significantly improving contrast ratio and visibility while maintaining the ability to display images.
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 electrochromic material achieves high transmittance, rapid response, and excellent light blocking efficiency with low driving voltage, eliminating the need for additional infrared cut films, thereby improving visibility and contrast ratio in transparent display devices.
Implementation Method 1
The electrochromic panel uses an electrochromic material whose color is reversibly changed by an oxidation-reduction reaction according to an applied voltage
Implementation Method 2
an electrochromic material whose color is reversibly changed by an oxidation-reduction reaction according to an applied voltage
Implementation Method 3
an excellent effect of blocking an infrared ray
Data Source
AI summary
The present disclosure relates to an electrochromic material having a relatively high response speed and a reversible discoloration even by a relatively low driving voltage and an electrochromic particle, a transmittance variable panel and a transmittance variable display device including the electrochromic material.