Light-Diffusing Film Transparent Conductive Layer Radio Wave Transparency
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Solution Overview
Problem
Light control films used in vehicle windows and construction have low electrical resistance, leading to high radio wave reflectivity, which interferes with electronic devices like television sets and mobile phones, and also face issues with adhesiveness and uniformity of the transparent conductive layer.
Innovation Solution
A light control film with a transparent conductive layer containing conductive particles dispersed in an organic binder resin, where the mass ratio of the binder resin to conductive particles is 50/50 to 10/90, and the binder resin includes (meth)acrylate with a hydroxyl group and a pentaerythritol skeleton, enhancing adhesiveness and surface resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent conductive layer with low electrical resistance is used, then light transmittance is improved, but radio wave reflectivity increases causing interference with electronic devices
Solution Approach 1:
The invention changes the electrical resistance parameter of the transparent conductive layer from low to high (1000-100000 ohm/sq), which simultaneously reduces radio wave reflectivity while maintaining adequate light transmittance. This parameter change resolves the contradiction by finding an optimal resistance value that balances optical and electromagnetic properties.
Solution Approach 2:
The invention uses a composite transparent conductive layer combining ITO particles (conductive material) with a resin matrix (polymer material). This composite structure provides both transparency and controlled electrical resistance, allowing the layer to transmit light while having high enough resistance to reduce radio wave interference. The composite nature enables simultaneous achievement of optical and electromagnetic properties.
2Object-generated harmful factors
If the surface resistivity of the transparent conductive layer is increased to reduce radio wave shielding, then radio wave transparency is improved, but adhesiveness between layers deteriorates
Solution Approach 1:
The invention changes the surface resistivity parameter to a specific range (1000-100000 ohm/sq) that balances radio wave transparency and adhesiveness. By controlling the resistivity within this range, the layer achieves high enough radio wave transparency while maintaining sufficient adhesiveness to other layers.
Solution Approach 2:
The composite structure of ITO particles dispersed in a resin matrix provides both high surface resistivity for radio wave transparency and good adhesiveness. The resin matrix ensures proper bonding to adjacent layers while the ITO particles provide the necessary electrical properties. This composite approach allows simultaneous achievement of high resistivity and good adhesion.
3Strength
If conductive particles are dispersed in organic binder resin to improve adhesiveness, then layer bonding is improved, but manufacturing uniformity becomes difficult
Solution Approach 1:
The invention controls the particle size of conductive particles within a specific range (0.1-10 micrometers) and adjusts the resin-to-particle ratio to achieve optimal uniformity. By controlling these parameters, the dispersion remains homogeneous during manufacturing while maintaining the required adhesiveness and electrical properties.
Solution Approach 2:
The invention uses a resin matrix that provides local bonding strength at the molecular level while the dispersed particles provide electrical conductivity. This local quality approach allows uniform distribution of particles throughout the resin, ensuring consistent adhesiveness and electrical properties across the entire layer while maintaining manufacturing uniformity.
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 film achieves stable driving and excellent radio wave transparency, allowing electronic devices to function properly and maintaining adhesiveness between layers, while reducing radio wave shielding and improving uniformity.
Implementation Method 1
the transparent conductive layer contains: conductive particles; and an organic binder resin, the mass ratio of the organic binder resin and the conductive particles is 50/50 to 10/90
Implementation Method 2
when an electric field is not applied, as a result of the Brownian motion of light control particles that are dispersed in the suspension, most of the incident light rays are reflected, scattered or absorbed by the light control particles
Implementation Method 3
most of the incident light rays are reflected, scattered or absorbed by the light control particles
Implementation Method 4
most of the incident light rays are reflected, scattered or absorbed by the light control particles
Implementation Method 5
the light control particles that exhibit a light control function cause polarization and are arranged in parallel to the electric field
Implementation Method 6
enhancing adhesiveness and surface resistivity
Data Source
Figure 1~2(b)
Figure 3(a)~4
AI summary
Disclosed is a light control film comprising: two of transparent conductive resin substrates each having a transparent conductive layer and a transparent resin substrate; and a light control layer interposed between the two transparent conductive resin substrates to be in contact with the transparent conductive layer sides, the light control layer containing: a resin matrix; and a light control suspension dispersed in the resin matrix, wherein the transparent conductive layer contains: an organic binder resin; and conductive particles dispersed in the organic binder resin, the mass ratio of the organic binder resin and the conductive particles is 50/50 to 10/90, and the entirety or a portion of the organic binder resin is composed of (meth) acrylate containing a hydroxyl group. The present invention can provide a light control film having excellent radio wave transparency and having satisfactory adhesiveness between the light control layer and the transparent conductive layer.