Thermal Conductive Sheet for Foldable Displays
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Solution Overview
Problem
Conventional graphite sheets used in heat dissipation for foldable products face challenges with layer separation due to low adhesive force, making them unsuitable for flexible and curved displays where high thermal conductivity is required without cracking or separation.
Innovation Solution
A thermal conductive sheet design featuring a graphite sheet positioned outside the bending region of a foldable layer, with adhesive layers and a polymer film layer to enhance adhesion and flexibility, preventing layer separation and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a graphite sheet is used for heat dissipation in foldable products, then thermal conductivity is improved, but layer separation occurs due to low adhesive force
Solution Approach 1:
The patent uses a composite structure consisting of a graphite sheet combined with a foldable layer and adhesive layers. This composite material approach allows the graphite sheet to provide high thermal conductivity while the adhesive layers provide strong bonding force, preventing layer separation and solving the contradiction between heat dissipation performance and structural stability.
Solution Approach 2:
The patent introduces adhesive layers as intermediary materials between the graphite sheet and the foldable layer. These adhesive layers serve as mediators that provide strong bonding force to prevent layer separation, while allowing the graphite sheet to maintain its thermal conductivity function. The adhesive layer acts as the intermediary that resolves the conflict between the graphite sheet's low adhesive force and the requirement for structural stability.
2Area of stationary object
If a graphite sheet is placed in the bending region of a foldable layer, then heat dissipation coverage is improved, but cracking and layer separation occur due to bending stress
Solution Approach 1:
The patent segments the structure by dividing it into a bending region and a non-bending region. The graphite sheet is specifically placed in the non-bending region, while the foldable layer maintains its flexibility in the bending region. This segmentation allows the heat dissipation component to avoid bending stress and cracking while the foldable layer can still bend as needed.
Solution Approach 2:
The patent applies different functional requirements to different regions: the non-bending region is designed for heat dissipation with the graphite sheet, while the bending region is designed for flexibility. This local quality approach allows each region to optimize its specific function without compromising the other, solving the contradiction between heat dissipation coverage and bending resistance.
3Stability of the object's composition
If adhesive force between graphite sheet and foldable layer is increased, then layer separation is prevented, but flexibility and bendability are reduced
Solution Approach 1:
The patent segments the structure into regions with different adhesive requirements. The adhesive layers provide strong bonding in the non-bending region where the graphite sheet is located, while the bending region maintains flexibility. This segmentation allows high adhesive force where needed without compromising overall flexibility.
Solution Approach 2:
The patent applies different properties to different regions: strong adhesive bonding in the non-bending region to prevent layer separation, and maintained flexibility in the bending region. This local quality approach resolves the contradiction by allowing high adhesive force locally where it is needed without reducing the overall flexibility of the foldable 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 effective heat dissipation while preventing graphite sheet cracking and layer separation, enhancing bending resistance and flexibility, thus addressing the limitations of conventional graphite sheets in foldable products.
Implementation Method 1
a first adhesive layer covered on the graphite sheet and the foldable layer
Implementation Method 2
a graphite sheet disposed on the foldable layer... the graphite sheet has an excellent two-dimensional thermal conductive performance
Data Source
AI summary
The present invention provides with a thermal conductive sheet including a foldable layer having a bending region, a graphite sheet disposed on the foldable layer, and disposed outside the bending region, a first adhesive layer covered on the graphite sheet and the foldable layer, and a polymer film layer coated on the first adhesive layer. Accordingly, the present invention has a good heat dissipation effect, bendable and flexible in order to avoid a layer separation phenomenon.