Optical Path Control Member Using Low Permittivity Solvent
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Solution Overview
Problem
Existing optical path control members face challenges in achieving both high driving speed and effective shielding performance, with lower optical conversion particle content or partition height improvements leading to compromised shielding, and higher permittivity solvents causing chemical resistance and side shielding rate issues.
Innovation Solution
An optical path control member with a structure featuring a first and second substrate, electrodes, and an adhesive layer, where the optical conversion part includes alternately disposed partition and accommodation parts with a solvent having a permittivity of 10 or less, allowing for rapid switching between light blocking and transmitting modes while maintaining chemical resistance and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the content of optical conversion particles is lowered to improve driving speed, then the driving speed is improved, but the shielding performance is deteriorated
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersion liquid, specifically using a solvent with permittivity of 10 or less (such as isoparaffin with permittivity 2.1-4.8). This parameter change allows the system to achieve fast particle response (improved driving speed) while maintaining adequate shielding performance through the optimized solvent properties that enhance particle mobility without requiring high particle concentrations.
2Speed
If the height of partition part is lowered to improve driving speed, then the driving speed is improved, but the shielding performance is deteriorated
Solution Approach 1:
The patent modifies the physical parameters of the dispersion liquid by selecting solvents with specific permittivity values (10 or less). This parameter change compensates for the reduced partition height effect, allowing particles to aggregate and disperse more efficiently in the lower volume space, thereby maintaining shielding performance while achieving faster response times.
3Speed
If a solvent with high permittivity is used to improve driving speed, then the driving speed is improved, but chemical resistance and side shielding rate are deteriorated
Solution Approach 1:
The patent applies parameter changes by selecting solvents with permittivity of 10 or less (such as isoparaffin with permittivity 2.1-4.8) instead of high permittivity solvents. This parameter optimization achieves a balance where the solvent provides adequate particle mobility for fast response while maintaining chemical resistance and preventing side reactions that would occur with high permittivity solvents.
Solution Approach 2:
The patent uses a composite dispersion liquid system combining specific low permittivity solvents (isoparaffin) with optical conversion particles. This composite material formulation achieves synergistic effects where the solvent properties enhance particle response speed while maintaining system stability, chemical resistance, and preventing unwanted side reactions.
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 driving speeds under 6 seconds, secure chemical resistance, and improved shielding performance by using a solvent with permittivity of 10 or less, effectively addressing the trade-offs in existing technologies.
Implementation Method 1
the dispersion liquid includes a solvent having a permittivity (ε) of 10 or less
Implementation Method 2
the dispersion liquid includes a solvent having a permittivity (ε) of 10 or less
Data Source
AI summary
An optical path control member according to an embodiment comprises: a first substrate; a first electrode disposed on the first substrate; an optical conversion part disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed below the second substrate; and an adhesive layer disposed between the optical conversion part and second electrode. The optical conversion part comprises partition parts and accommodation parts which are alternately disposed. The accommodation parts comprise a dispersion liquid and optical conversion particles. The light transmittance of the accommodation parts changes in accordance with the application of voltage, and the driving speed measured by 85% reach time is less than 6 seconds.