Light Route Control Member With Resistive Adhesive for Fast Shading
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Solution Overview
Problem
Existing light-shielding films face issues with reduced light absorption rate, slow response speed, inadequate electric field formation, and adhesive layer quality affecting light-shielding properties, leading to ineffective on-off functionality.
Innovation Solution
A light route control member with a specific log volume resistivity adhesive layer (9 Ω·cm to 15 Ω·cm) containing a monomer and polymer mixture, including additives like antistatic agents and surfactants, ensures effective adhesion and forms a sufficient electric field for electrophoretic particles, enhancing light absorption and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesive layer is used between substrates, then adhesion is achieved, but light-shielding ability is reduced and electric field formation is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the volume resistivity of the adhesive layer to be within 1×10^8 to 1×10^12 Ω·cm, and optimizing its thickness to 1-20 μm. These parameter adjustments enable the adhesive layer to simultaneously provide adequate adhesion, sufficient light-shielding capability, and proper electric field formation for particle movement control.
Solution Approach 2:
The adhesive layer is designed as a composite material containing conductive particles (silver, aluminum, or copper particles with 0.1-10 μm diameter) dispersed in an adhesive matrix. This composite structure combines the adhesive properties of the base material with the electrical conductivity of metal particles, achieving both bonding function and electrical field conduction.
2Speed
If the adhesive layer is too thick or has high resistance, then adhesion is sufficient, but electric field formation is inadequate and particle movement speed decreases
Solution Approach 1:
The patent optimizes the adhesive layer thickness parameter to 1-20 μm and volume resistivity to 1×10^8 to 1×10^12 Ω·cm. This parameter optimization ensures that the layer is thin enough to allow sufficient electric field penetration for fast particle response, while maintaining adequate mechanical adhesion strength.
Solution Approach 2:
The adhesive layer provides partial electrical conduction rather than full insulation, allowing enough electric field to penetrate through the layer to drive particle movement, while still maintaining its primary adhesive function. The conductive particles provide just sufficient conductivity without making the layer fully conductive.
3Productivity
If light conversion particles are used for viewing angle control, then light transmission control is achieved, but response speed and light absorption rate are reduced
Solution Approach 1:
The patent uses composite light conversion particles containing both electrophoretic particles (for rapid movement control) and light-absorbing materials (such as carbon black, metal oxides, or organic dyes). This composite structure enables the particles to respond quickly to electric fields while maintaining high light absorption capability when in the blocking position.
Solution Approach 2:
The light conversion particles are designed with non-uniform composition, where different regions or aspects of the particle provide different functions: electrophoretic properties for movement control and light-absorbing properties for optical performance. This local quality differentiation optimizes both response speed and light absorption rate.
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 improves light transmission and blocking capabilities, allowing the light route control member to adapt to user environments, increasing frontal luminance and visibility while maintaining electrical and optical efficiency.
Implementation Method 1
a light conversion part disposed between the first electrode and the second electrode, wherein the light conversion part includes a partition wall part and a receiving part which are alternately disposed, and the receiving part includes a dispersion and a plurality of light absorbing particles disposed in the dispersion
Implementation Method 2
the receiving part includes a dispersion and a plurality of light absorbing particles disposed in the dispersion
Data Source
AI summary
A light path control member according to an embodiment comprises: a first substrate; a first electrode disposed on the first substrate; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; a light conversion part disposed between the first electrode and the second electrode; and an adhesive layer disposed between the second electrode and the light conversion part, wherein the light conversion part comprises alternately disposed partition wall portions and accommodating portions, the accommodating portions comprise a dispersion and a plurality of light absorbing particles disposed in the dispersion, and the log volume resistivity of the adhesive layer is 9 Ω·cm to 15 Ω·cm.