Colorant PSA Sheet for Light Blocking and Optical Control
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Solution Overview
Problem
PSA sheets with limited light transmission face challenges in achieving high-precision optical control due to light refraction and diffusion, affecting sensor accuracy in devices like portable electronic devices.
Innovation Solution
A PSA sheet with a PSA layer containing at least two species of colorants, having a light transmittance of 30% or lower and an optical reflectance of 8% or higher, combined with a thickness of 10 μm to 50 μm, to reduce light entering the PSA and enhance optical control precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If PSA sheets with limited light transmission are used to block light, then light-blocking property is improved, but light refraction and diffusion occur causing poor optical control precision
Solution Approach 1:
The patent changes the optical parameters of the PSA layer by controlling light transmittance to be 30% or lower and light reflectance to be 8% or higher. This parameter adjustment allows the PSA to block light effectively while reducing light refraction and diffusion, thereby improving both light-blocking property and optical control precision
Solution Approach 2:
The patent uses a composite PSA layer containing multiple components including polymer base resin, colorants, and inorganic particles. This composite structure enables simultaneous achievement of light-blocking, reduced refraction, and maintained adhesive properties by combining materials with complementary optical and adhesive characteristics
2Object-affected harmful factors
If colorants are added to achieve light transmittance of 30% or lower, then light-blocking property is improved, but adhesive strength may deteriorate
Solution Approach 1:
The patent applies local quality by concentrating colorants and inorganic particles within the PSA layer while maintaining the polymer matrix continuity. This localized distribution achieves light-blocking function in specific regions without compromising the overall adhesive network structure, preserving adhesive strength
Solution Approach 2:
The patent employs a composite formulation where colorants are combined with inorganic particles and polymer base resin in specific ratios. This composite approach allows the colorants to provide light-blocking function while the inorganic particles and polymer matrix maintain adhesive properties, preventing adhesive strength deterioration
3Measurement precision
If light reflectance is increased to 8% or higher to reduce light entry, then optical control precision is improved, but light transmission control becomes more difficult
Solution Approach 1:
The patent creates a dynamic optical system where the PSA layer can adjust its light interaction properties. By combining materials with different optical characteristics (absorbing colorants and reflecting inorganic particles), the system dynamically balances light absorption and reflection based on incident light conditions, maintaining both high reflectance and transmission control
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 PSA sheet effectively combines light-blocking or light-dimming properties with high-precision optical control, reducing light entry and maintaining adhesive strength, suitable for bonding members in portable electronic devices.
Implementation Method 1
PSA sheets with limited light transmission as described above absorb light into the PSA sheets for optical control
Implementation Method 2
The PSA layer has a light transmittance of 30% or lower and an optical reflectance of 8% or higher
Data Source
AI summary
Provided is a PSA sheet having limited light transmission with reduced PSA-entering light. A PSA sheet having a PSA layer is provided. The PSA layer comprising at least two species of colorants. The PSA layer has a light transmittance of 30% or lower and a light reflectance of 8% or higher.