Light Control Film Primer Layer Pattern Cutting
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Solution Overview
Problem
Conventional light control glasses face challenges in varying light transmittance across different regions, particularly in designing patterns like characters or pictures, due to poor adhesiveness between the polymeric resin film matrix and electroconductive substrates, leading to issues with sedimentation, aggregation, and uneven optical density.
Innovation Solution
A light control film is developed with a primer layer on at least one transparent electroconductive resin substrate, allowing for precise cutting of patterns or designs that create closed regions electrically insulated from the surrounding film, enabling independent control of light transmittance in these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light control suspension is sealed into a gap between two transparent electroconductive substrates, then the light control function is achieved, but the gap between substrates changes under external pressure causing uneven optical density and color phase
Solution Approach 1:
The patent uses a flexible polymeric resin film as the substrate material instead of rigid glass substrates. This flexible film can elastically deform under external pressure changes, maintaining constant contact between the light control suspension and the electroconductive layers, thereby preventing gaps and ensuring uniform optical density and color phase across the display surface.
2Reliability
If light control particles are dispersed in a liquid suspension, then the light control function is achieved, but the particles aggregate and sediment over time
Solution Approach 1:
The patent employs a composite light control suspension containing light control particles, a dispersant, and a stabilizer. The dispersant prevents particle aggregation through steric or electrostatic repulsion, while the stabilizer maintains long-term suspension stability. This composite formulation ensures both the light control function and compositional stability over time.
3Adaptability or versatility
If a cutting line is made in the transparent electroconductive film to create closed regions for pattern control, then independent light transmittance control is achieved, but the film adhesiveness deteriorates
Solution Approach 1:
The patent performs preliminary reinforcement of the transparent electroconductive film at potential cutting locations before making the actual cuts. This preliminary action involves applying adhesive promoters or structural reinforcements at these locations, ensuring that the film maintains strong adhesion even after cutting, thus enabling region-specific light control without compromising overall film reliability.
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 solution allows for easy and flexible variation of light transmittance in specific regions, such as characters or pictures, while maintaining overall film performance and durability, even under varying environmental conditions.
Implementation Method 1
The light control particles, which show a light control function, are polarized so that the particles are arranged in parallel to the electric field.
Implementation Method 2
the great majority of incident light is reflected, scattered or absorbed on/in the light control particles dispersed in the suspension by Brownian movement of the light control particles
Data Source
AI summary
A light control film includes two transparent electroconductive resin substrates each having a transparent electroconductive film and a transparent resin substrate and a light control layer sandwiched between the transparent electroconductive film sides of the two transparent electroconductive resin substrates. The transparent electroconductive film of one transparent electroconductive resin substrate having a primer layer is cut through a cutting line to have a shape of a picture or character, and the cutting line is in a form that a start point for the cutting and an end point for the cutting make a closed region. The closed region of the picture of character is electrically insulated from the transparent electroconductive film around the shape of the picture or character. The light control film enables to improve adhesiveness between film matrix and substrates and to provide stable control function.