Foldable Display Adhesive Gap Layout for Heat and Bending
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Solution Overview
Problem
Existing display devices face challenges in achieving improved heat dissipation and folding characteristics, particularly in flexible and foldable designs.
Innovation Solution
The display device incorporates a heat dissipation layer with spaced adhesive layers and a plate-folding portion with defined openings, along with additional adhesive layers and plates to enhance heat dissipation and folding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a continuous adhesive layer is used between the first plate and heat dissipation layer, then bonding strength is improved, but folding characteristics deteriorate due to stress concentration
Solution Approach 1:
The adhesive layer is segmented into first and second sub adhesive layers that are spaced apart in the first direction, creating a discontinuous structure. This segmentation reduces stress concentration during folding while maintaining sufficient bonding strength in the non-folding regions, thereby resolving the contradiction between bonding strength and folding characteristics.
2Strength
If the first plate is made rigid for structural support, then mechanical strength is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The first plate is designed with different local properties: it has a plate-folding portion with openings in the folding region to enhance flexibility and heat dissipation, while maintaining structural integrity in non-folding regions. This local differentiation allows the plate to provide mechanical support where needed while facilitating heat dissipation in folding regions.
3Reliability
If the plate-folding portion width is reduced for flexibility, then folding characteristics are improved, but structural stability deteriorates
Solution Approach 1:
The width of the plate-folding portion is optimized to be smaller than the gap between sub adhesive layers (by 0.5-3 mm), creating a specific parameter relationship that allows flexibility during folding while maintaining overall structural stability. This parameter optimization enables the plate to bend without compromising the stability of the entire display device structure.
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 provides enhanced heat dissipation and improved folding capabilities, reducing stress and maintaining structural integrity during folding operations.
Implementation Method 1
a heat dissipation layer disposed under the first plate
Implementation Method 2
a first adhesive layer disposed between the first plate and the heat dissipation layer
Data Source
AI summary
A display device includes a display panel including a first non-folding region, a folding region, and a second non-folding region sequentially arranged along a first direction, a first plate disposed under the display panel, a heat dissipation layer disposed under the first plate, and a first adhesive layer disposed between the first plate and the heat dissipation layer. The first adhesive layer includes a first sub adhesive layer overlapping the first non-folding region, and a second sub adhesive layer overlapping the second non-folding region, the first sub adhesive layer and the second sub adhesive layer are spaced apart from each other in the first direction, and a width of a first gap by which the first sub adhesive layer and the second sub adhesive layer are spaced apart is in a range of about 9 millimeters (mm) to about 12 mm.