Composite Adhesive Sheet for Display Uniformity
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Solution Overview
Problem
Existing pressure sensitive adhesive layers in display bodies, especially those with colored or light-diffusing layers, experience uneven optical functions when in contact with irregular surfaces, leading to issues like uneven brightness due to transmittance and light diffusion irregularities.
Innovation Solution
A composite pressure sensitive adhesive sheet comprising an optically functional layer and a transparent layer, with a release sheet, is used to bond two rigid plates, where the optically functional layer is bonded first to absorb deformation and stress, preventing uneven optical functions by maintaining desired transmittance and haze values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a colored pressure sensitive adhesive layer is provided to improve design properties and achieve unity with peripheral members, then the display body can be colored to match the frame material, but uneven transmittance occurs in the colored layer when in contact with steps, causing uneven brightness
Solution Approach 1:
The pressure sensitive adhesive layer is divided into multiple functional layers: a colored layer containing colorant for design purposes, and a transparent layer without optical function. This segmentation allows each layer to perform its specific function independently, preventing the colored layer from直接接触 steps and causing uneven transmittance.
Solution Approach 2:
The transparent layer acts as an intermediary between the colored layer and the rigid plate with irregularities. It absorbs the deformation and stress from the irregular surface, preventing these irregularities from directly affecting the optical properties of the colored layer, thus maintaining uniform transmittance.
2Illumination intensity
If a light-diffusing pressure sensitive adhesive layer containing light-diffusing fine particles is provided to achieve uniform light distribution, then light diffusion is improved, but uneven light diffusion occurs when the layer is provided so as to be in contact with steps
Solution Approach 1:
The pressure sensitive adhesive layer is segmented into a light-diffusing layer containing light-diffusing fine particles and a transparent layer. This segmentation ensures that the light-diffusing layer does not directly contact the irregular surface, preventing uneven light diffusion while maintaining the light diffusion function.
Solution Approach 2:
The transparent layer serves as an intermediary that protects the light-diffusing layer from direct contact with steps and irregularities. It absorbs the mechanical deformation from the irregular surface, ensuring that the light-diffusing particles remain uniformly distributed and function properly.
3Ease of manufacture
If the colored layer is provided so as to be in contact with steps to achieve unity with peripheral members, then the design goal is achieved, but uneven brightness is caused due to uneven transmittance
Solution Approach 1:
The adhesive layer is segmented into a colored layer for concealability and a transparent layer for maintaining optical uniformity. This segmentation allows the colored layer to be positioned away from the steps, achieving both design goals without compromising brightness uniformity.
Solution Approach 2:
The transparent layer acts as a mediator that prevents the colored layer from directly contacting the irregular surface. It absorbs the deformation and stress from the steps, ensuring uniform light transmission through the colored layer and maintaining consistent brightness.
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 effectively suppresses uneven optical functions in the adhesive layer, ensuring uniform brightness and optical performance even on irregular surfaces, enhancing the display body's appearance and concealability when turned off.
Implementation Method 1
the transparent pressure sensitive adhesive layer absorbs the deformation and stress
Implementation Method 2
the composite pressure sensitive adhesive layer having a straightforward transmittance of 90% or less for light rays having a wavelength of 550 nm
Data Source
AI summary
A pressure sensitive adhesive sheet for bonding two rigid plates together, at least one of the two rigid plates having irregularities on a surface on a side to be bonded to the other rigid plate, the pressure sensitive adhesive sheet containing: a composite pressure sensitive adhesive layer containing an optically functional pressure sensitive adhesive layer and a transparent pressure sensitive adhesive layer that does not have an optical function of the optically functional pressure sensitive adhesive layer; and a release sheet laminated on the transparent pressure sensitive adhesive layer in the composite pressure sensitive adhesive layer, the composite pressure sensitive adhesive layer having a straightforward transmittance of 90% or less for light rays having a wavelength of 550 nm. According to such a pressure sensitive adhesive sheet, uneven optical function in the pressure sensitive adhesive layers can be suppressed.