Electro-optical Device Driving Voltage Time Division
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Solution Overview
Problem
In electro-optical devices using electrochromic materials, the alignment of multiple light-adjusting elements side by side can lead to malfunction and damage due to high transverse-direction voltage causing oxidation-reduction reactions and exceeding the potential window of organic solvents, resulting in air bubbles and damage when high voltage is applied for extended periods.
Innovation Solution
A driving device applies a first DC voltage of positive polarity cyclically repeating a higher voltage and a second DC voltage of negative polarity with a lower voltage, ensuring these periods do not overlap, thereby preventing excessive voltage between adjacent elements and using time division to supply voltages to each electro-optical element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light-adjusting elements are aligned side by side in an electro-optical device, then the device can achieve diverse optical states (dark state, mirror surface state, light-transmitting state), but high transverse-direction voltage occurs between adjacent elements causing oxidation-reduction reactions and element damage
Solution Approach 1:
The patent applies periodic action by using AC voltage instead of DC voltage. The AC voltage periodically reverses polarity, ensuring that adjacent electro-optical elements do not experience continuous high transverse-direction voltage. This periodic reversal prevents sustained oxidation-reduction reactions in the electrolyte layer, thereby maintaining element durability while preserving the ability to switch between dark state, mirror surface state, and light-transmitting state.
2Ease of manufacture
If high voltage is applied to achieve dark state or mirror surface state, then the optical switching function is achieved, but the organic solvent in the electrolyte layer is damaged causing air bubbles and element damage
Solution Approach 1:
The AC voltage application ensures that high voltage is applied only during necessary optical state transitions and is periodically reversed. This prevents continuous high voltage exposure that would otherwise cause progressive damage to the organic solvent in the electrolyte layer, eliminating the formation of air bubbles and extending element lifespan.
Solution Approach 2:
The patent employs beforehand cushioning by using AC voltage to preemptively prevent excessive voltage accumulation between adjacent elements. The periodic reversal of voltage polarity acts as a protective mechanism that cushions against voltage buildup that would exceed the potential window of the organic solvent, thereby preventing solvent damage before it occurs.
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
This method prevents damage and malfunction by avoiding high voltages between adjacent elements, allowing for stable operation and maintaining the desired states of transparency, mirror surface, and darkness in an electro-optical device, while reducing power consumption and maintaining states over long periods.
Implementation Method 1
an oxidation-reduction reaction (electro-deposition) occurs in the electrolyte layer that exists between the electrodes
Implementation Method 2
an electrochromic material that contains silver... silver ions in the electrochromic material are reduced and deposited as silver to form a film
Implementation Method 3
the first DC voltage and the second DC voltage are supplied by time division so that the applied period of the first voltage and the applied period of the third voltage do not overlap
Data Source
AI summary
To prevent damage in an electro-optical device that uses electrochromic material. The device includes electro-optical elements and a driving device that applies a driving voltage to the electro-optical elements. The driving device applies a first DC voltage of a positive polarity that cyclically repeats a first voltage and a second voltage that is lower than the first voltage, or a second DC voltage of a negative polarity that cyclically repeats a third voltage and a fourth voltage that is higher than the third voltage, to the electro-optical elements. According to the driving device, when the first DC voltage is applied to one and the second DC voltage is applied to the other electro-optical elements adjacent in the planar view, the first and the second DC voltages are supplied by time division so that the applied period of the first voltage and the third voltage do not overlap.