Curved Panel Adhesive Structure for Stress Mitigation
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Solution Overview
Problem
Curved display panels often experience uneven residual stress after bending, leading to light leakage issues due to the uneven distribution of stress at edges or corners.
Innovation Solution
A curved panel design incorporating a first and second curved substrate, a curved coverlens, and an adhesive structure with a cured liquid adhesive of elastic modulus between 0.265 MPa to 20 MPa, where the adhesive structure is strategically placed between the substrates and coverlens to mitigate stress distribution and prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a display panel is bent to form a curved panel, then the curved shape is achieved to improve user experience and market potential, but uneven residual stress distribution occurs at edges or corners leading to light leakage
Solution Approach 1:
The patent applies local quality by placing adhesive structures specifically at the edge regions of the curved panel where residual stress concentrates. The adhesive structure includes a first adhesive layer at the first edge and a second adhesive layer at the second edge, creating localized stress compensation zones exactly where needed rather than uniformly across the entire panel.
Solution Approach 2:
The adhesive structure acts as an intermediary element between the display panel and the surrounding structure. It mediates the stress distribution by providing a compliant interface that absorbs and redistributes residual stress, preventing direct stress concentration at the panel edges that would cause light leakage.
2Reliability
If adhesive structure is added to mitigate residual stress, then light leakage is prevented and brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The adhesive structure is segmented into distinct first and second adhesive layers positioned at different edges of the panel. Each adhesive layer independently addresses stress concentration at its respective edge, allowing for modular design and simplifying the overall structure by breaking down the complex stress mitigation function into manageable segments.
Solution Approach 2:
The patent utilizes parameter changes by controlling the elastic modulus of the adhesive material to be within a specific range (0.1 MPa to 10 MPa). This parameter optimization ensures the adhesive is compliant enough to absorb stress but rigid enough to maintain structural integrity, achieving stress mitigation without excessive complexity.
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 reduces residual stress and prevents light leakage, ensuring greater than or equal to 50% brightness uniformity on the curved panel.
Implementation Method 1
an elastic modulus of the cured liquid adhesive is 0.265 MPa to 20 MPa
Implementation Method 2
The adhesive structure is located between the first curved substrate and the curved coverlens
Data Source
AI summary
A curved panel includes a first curved substrate, a second curved substrate, a curved coverlens, and an adhesive structure. The first curved substrate and the second curved substrate are overlapped with each other. First to fourth sidewalls of the first curved substrate correspond to fifth to eighth sidewalls of the second curved substrate, respectively. The first to third sidewalls of the first curved substrate extend beyond the fifth to seventh sidewalls of the second curved substrate, respectively. The second curved substrate is located between the curved coverlens and the first curved substrate. The second curved substrate is bonded to the curved coverlens through an adhesive layer. The adhesive structure is located between the first curved substrate and the curved coverlens and is laterally located between the first sidewall and the fifth sidewall, between the second sidewall and the sixth sidewall, and between the third sidewall and the seventh sidewall.