High-Refractive-Index PSA Sheet for Interface Reflection Control
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Solution Overview
Problem
Existing PSA sheets with limited light transmission suffer from light reflection at the interface due to a large difference in refractive index with the adherend, affecting optical sensor accuracy and causing malfunctions.
Innovation Solution
A PSA sheet with a high-refractive-index particle-concentrated layer on one face, reducing light reflection by increasing the refractive index of the adhesive face while maintaining adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a PSA sheet with limited light transmission is used, then light-blocking properties are improved, but light reflection at the interface increases due to refractive index difference
Solution Approach 1:
The patent applies local quality by creating a concentration zone of high-refractive-index particles in the light-blocking layer. Instead of uniformly distributing particles throughout the PSA layer, the particles are concentrated in a specific region (within 100 nm from the interface with the light-blocking layer), creating a localized area with enhanced refractive index specifically at the interface where light reflection occurs. This localized modification reduces light reflection without compromising the overall light-blocking performance of the PSA sheet.
Solution Approach 2:
The patent employs composite materials by combining the PSA base material with high-refractive-index particles (such as TiO2, SiO2, or ZrO2 particles). This composite structure creates a light-blocking layer that possesses both the light-blocking properties of the PSA and the light reflection reduction capabilities of the high-refractive-index particles, effectively addressing both harmful factors simultaneously.
2Object-affected harmful factors
If high-refractive-index particles are added to reduce light reflection, then light reflection is reduced, but adhesive strength may deteriorate
Solution Approach 1:
The patent applies local quality by creating a concentration zone of high-refractive-index particles in the light-blocking layer. Instead of uniformly distributing particles throughout the PSA layer, the particles are concentrated in a specific region (within 100 nm from the interface with the light-blocking layer), creating a localized area with enhanced refractive index specifically at the interface where light reflection occurs. This localized modification reduces light reflection without compromising the overall light-blocking performance of the PSA sheet.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the concentration, size (0.1-10 μm), and distribution of high-refractive-index particles. By adjusting these parameters, the patent optimizes the balance between light reflection reduction and adhesive strength maintenance. The particles are concentrated in a specific region rather than uniformly distributed, which allows the interface refractive index to be modified without significantly affecting the overall adhesive properties of the PSA layer.
3Ease of manufacture
If uniform particle distribution is used throughout the PSA layer, then manufacturing is simplified, but light reflection reduction effect is insufficient
Solution Approach 1:
The patent applies local quality by creating a concentration zone of high-refractive-index particles in the light-blocking layer. Instead of uniformly distributing particles throughout the PSA layer, the particles are concentrated in a specific region (within 100 nm from the interface with the light-blocking layer), creating a localized area with enhanced refractive index specifically at the interface where light reflection occurs. This localized modification reduces light reflection without compromising the overall light-blocking performance of the PSA sheet.
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 reduces light reflection at the interface, enhancing optical sensor accuracy and providing desirable light-blocking properties with minimal impact on adhesive strength.
Implementation Method 1
when the difference in refractive index (RI) is large between itself and the member to which the PSA sheet is applied, the light may be reflected at their interface
Implementation Method 2
the light may be reflected at their interface between the PSA sheet and the adherend
Implementation Method 3
a light-blocking PSA is used to reduce reflection of the light through the screen and prevent reduction of screen visibility
Data Source
AI summary
Provided is a PSA sheet having limited light transmission, an increased refractive index and good adhesive properties. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a total light transmittance below 80%. The PSA layer has a first face and a second face on the opposite side to the first face. The PSA layer comprises high-refractive-index particles. In the PSA layer, the high-refractive-index particles are concentrated in a range that extends from the first face towards the second face side and has a thickness of at least 100 nm, accounting for less than 50% of the PSA layer thickness.