Foldable Display Adhesive Spacer Alignment
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Solution Overview
Problem
Current foldable display devices face challenges in maintaining structural integrity and light transmittance while folding, due to variations in adhesive layer thickness and spacer distribution, which affect shock resistance and display performance.
Innovation Solution
A foldable display device design featuring pressure-sensitive adhesive layers with spacers distributed in the second adhesive layer, where the spacers are in contact with both surfaces of the second adhesive layer in the folding area, and their diameter is about 60% to 88% of the adhesive layer thickness in non-curved parts, enhancing shock resistance and maintaining light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are used to bond members in a foldable display device, then structural integrity is improved, but variations in adhesive layer thickness cause non-uniform stress distribution that reduces reliability during folding
Solution Approach 1:
The patent introduces spacers at specific locations within the adhesive layer to create localized regions with different thicknesses. These spacers are positioned where additional stress relief is needed, creating non-uniform spacer distribution that compensates for the inherent non-uniform stress distribution in the adhesive layer, thereby improving overall reliability during folding operations.
2Reliability
If spacers are added to the adhesive layer to improve shock resistance, then structural reliability is improved, but light transmittance may be reduced
Solution Approach 1:
The patent carefully controls the parameters of the spacers, including their material composition, size, and distribution density, to optimize the balance between shock resistance and light transmittance. By adjusting these parameters, the spacers provide the necessary structural support while minimizing their impact on optical performance.
Solution Approach 2:
The adhesive layer becomes a composite structure combining the base adhesive material with spacer elements. This composite approach allows the system to simultaneously achieve the mechanical benefits of the adhesive layer and the optical benefits of the spacer materials, which are selected for their specific properties regarding both shock resistance and light transmission.
3Strength
If the adhesive layer thickness is increased to improve bonding strength, then structural integrity is improved, but the device becomes more complex and harder to manufacture
Solution Approach 1:
Instead of using a single thick adhesive layer, the patent segments the adhesive structure by incorporating discrete spacer elements throughout the adhesive layer. This segmentation approach maintains the overall bonding strength while simplifying the manufacturing process, as the spacers can be integrated during standard assembly operations rather than requiring separate thick adhesive application steps.
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 design improves shock resistance and maintains light transmittance by ensuring spacers align and contact correctly during folding, alleviating torsional stress and preventing light transmittance reduction, thus enhancing the overall performance of the foldable display device.
Implementation Method 1
The first and second adhesive layers each include a pressure sensitive adhesive
Data Source
AI summary
A display device includes: a display panel; a first member disposed on the display panel; a second member disposed on the display panel; a first adhesive layer disposed between the display panel and the first member; and a second adhesive layer disposed between the display panel and the second member. The spacers are disposed in the second adhesive layer.