Electrochemical Device Mediator Material for Stable Light Modulation
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Solution Overview
Problem
Conventional electro-deposition (ED) elements experience changes in response characteristics and light absorption when exposed to high brightness lights, such as laser beams, leading to unstable operation and irregularities, particularly in applications like head-up displays.
Innovation Solution
The use of electrolyte solutions containing mediators like Ge or Ta instead of traditional Cu-based mediators, which maintain the electrochemical device in a stable, colorless state even under high brightness light exposure, preventing changes in response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Cu-based mediators are used in the electrolyte solution, then electrochemical reactions can proceed, but the electrolyte solution absorbs light in the visible range causing yellow discoloration and unstable response characteristics under high brightness light exposure
Solution Approach 1:
The patent changes the chemical composition parameters of the mediator from Cu-based to Ge or Ta-based compounds. This parameter change eliminates the light absorption in the visible range while maintaining the electrochemical mediation function, thereby resolving both the discoloration issue and the instability under high brightness light exposure.
2Illumination intensity
If high brightness lights such as laser beams are irradiated on the ED element, then light modulation can be achieved, but the response characteristics change and stable operation cannot be expected
Solution Approach 1:
The patent introduces Ge or Ta-based compounds as new mediators that act as intermediaries in the electrochemical reactions. These mediators are resistant to high brightness light exposure and do not cause the response characteristic changes that occur with Cu-based mediators, thereby maintaining reliability under high illumination intensity.
3Ease of operation
If the electrolyte solution contains traditional mediators, then electrochemical reactions occur, but irregularities appear under direct viewing conditions degrading the appearance
Solution Approach 1:
The patent changes the mediator composition from Cu-based to Ge or Ta-based compounds, which do not produce the irregularities or discoloration visible under direct viewing conditions. This parameter change maintains the electrochemical functionality while eliminating the visual defects.
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 Ge or Ta mediators ensure minimal light absorption in the visible range, maintaining consistent response characteristics and preventing changes in the electrochemical device's operation, even when exposed to high brightness lights, thus ensuring stable and reproducible performance.
Implementation Method 1
mediators like Ge or Ta instead of traditional Cu-based mediators, which maintain the electrochemical device in a stable, colorless state even under high brightness light exposure, preventing changes in response characteristics
Implementation Method 2
capable of performing deposition/solution of a mirror layer of Ag by electro-chemical reaction
Implementation Method 3
The mediator is a material which oxidizes or reduces electro-chemically at a lower energy than silver
Data Source
Figure 1A~1C
Figure 2A~2E
Figure 3A~3B
AI summary
An electro-chemical device having a cell thickness of 1µm - 1000µm, comprising a first and a second substrate disposed to face each other, and having electrodes on facing surfaces, transparent electrolyte solution sandwiched between the first and the second substrates, containing electro-deposition material containing Ag, mediator, supporting electrolyte, and solvent, and having optical density not larger than 0.1 in visible light range of wavelength 400 nm - 800 nm.