Foldable Display Backplane Support With Modulus-Tuned Adhesive
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Solution Overview
Problem
Existing display panel support structures fail to provide adequate mechanical buffer and protection during bending or folding, leading to potential damage and reduced reliability of flexible or foldable display panels.
Innovation Solution
A backboard support structure comprising a substrate support film with a modulus of elasticity of 1Gpa - 10Gpa and an adhesive layer with a modulus of elasticity of 1Kpa - 250Kpa, designed to provide mechanical buffer and protection by reducing stress concentration and ensuring good bending recovery and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid backplane support structure is used, then structural strength is improved, but bending flexibility and stress distribution deteriorate
Solution Approach 1:
The backplane support structure uses a composite material system consisting of a substrate support film (modulus: 1-10 GPa) and an adhesive layer (modulus: 1-250 kPa). This composite structure combines the structural strength of the support film with the flexibility and stress-absorbing capability of the soft adhesive layer, enabling both rigidity and bending flexibility simultaneously.
Solution Approach 2:
The patent applies different mechanical properties to different parts of the support structure: the substrate support film provides high structural strength and dimensional stability, while the adhesive layer provides softness and flexibility. This local differentiation of material properties allows the structure to maintain strength where needed while providing flexibility where bending occurs.
2Adaptability or versatility
If a soft adhesive layer is used, then bending flexibility is improved, but structural strength and deformation resistance deteriorate
Solution Approach 1:
The composite structure combines a soft adhesive layer (modulus: 1-250 kPa) for flexibility with a rigid substrate support film (modulus: 1-10 GPa) for structural strength. The adhesive layer enables bending while the support film maintains overall structural integrity and deformation resistance.
Solution Approach 2:
The backplane support structure is segmented into two functional layers: the substrate support film that provides structural strength and the adhesive layer that provides flexibility. This segmentation allows each layer to perform its specialized function without compromising the other.
3Strength
If high modulus materials are used, then deformation resistance is improved, but stress concentration and damage risk during bending increase
Solution Approach 1:
The patent uses a composite material system where the substrate support film (modulus: 1-10 GPa) provides deformation resistance while the soft adhesive layer (modulus: 1-250 kPa) acts as a stress buffer. This combination prevents stress concentration by allowing the adhesive layer to absorb and distribute bending stresses uniformly.
Solution Approach 2:
The soft adhesive layer serves as a pre-configured cushioning element between the rigid substrate support film and the flexible display panel. During bending, this adhesive layer absorbs stresses before they can concentrate on the display panel, preventing damage in advance.
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 backboard support structure effectively prevents damage to flexible or foldable display panels by distributing bending forces, enhancing the stability and reliability of the display device.
Implementation Method 1
the substrate support film has a modulus of elasticity of 1Gpa - 10Gpa, and the adhesive layer has a modulus of elasticity of 1Kpa - 250Kpa
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
Provided are a backboard support structure, a preparation method therefor, and a display device. The display device comprise a display substrate (201) and a backboard support structure, wherein the backboard support structure comprises a substrate support film (101) and an adhesive layer (102) arranged in a laminated manner. The backboard support structure is bonded to the non-display side of the display substrate (201) via the adhesive layer (102), and comprises a first bendable region (10) and a first non-bent region (20). The adhesive layer (102) comprises a first portion (1021) located in the first bendable region (10) and a second portion (1022) located in the first non-bent region (20); wherein the first portion (1021) has a modulus of elasticity of about 1Kpa - 150Kpa, the second portion (1022) has a modulus of elasticity of about 150Kpa - 250Kpa, and the substrate support film (101) has a modulus of elasticity of about 1Gpa - 10Gpa. The display substrate (201) is a foldable display substrate comprising a second bendable region (2011) and a second non-bent region (2012), wherein the first bendable region (10) and the second bendable region (2011) are correspondingly arranged in a laminated manner, and the first non-bent region (20) and the second non-bent region (2012) are correspondingly arranged in a laminated manner. The display device has a superior bending property.