OLED Adhesive Layer Corner Cutting for Moisture Stress Reduction
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Solution Overview
Problem
In organic light-emitting display devices, moisture permeation through the adhesive layer, particularly in corner regions, leads to stress differences and potential deformation or damage of substrates due to the swelling of moisture-absorbing materials.
Innovation Solution
The design incorporates a chamfer-shaped first cutting portion in the corner regions of the adhesive layer, along with align keys, to reduce moisture permeation rates and mitigate stress distribution, with the adhesive layer's size being smaller than the upper substrate and featuring a metal upper substrate with lower transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer with moisture-absorbing material is used to attach the upper substrate to the lower substrate, then the organic light-emitting layer is protected from external moisture, but moisture permeates through the adhesive layer particularly in corner regions causing stress difference and substrate deformation
Solution Approach 1:
The adhesive layer is designed with different properties in different regions: the corner regions have reduced adhesive material or different composition compared to the central region. This local differentiation reduces moisture absorption in corners while maintaining protection in the central display area, resolving the contradiction between overall protection and corner moisture permeation.
Solution Approach 2:
The adhesive layer is segmented into multiple regions with different characteristics - corner regions are treated differently from the central region. This segmentation allows the adhesive layer to provide uniform stress distribution while reducing moisture permeation in the vulnerable corner areas through localized modifications.
2Reliability
If the adhesive layer covers the entire upper substrate to provide complete protection, then moisture protection is maximized, but stress distribution becomes uneven causing substrate deformation
Solution Approach 1:
The adhesive layer composition or thickness is locally adjusted in corner regions to reduce stress concentration. This local quality modification maintains overall moisture protection while preventing the stress-induced deformation that would occur with uniform adhesive coverage across the entire substrate.
3Object-affected harmful factors
If corner regions of the adhesive layer are reduced in size to decrease moisture permeation, then moisture absorption is reduced, but the protective coverage area is decreased
Solution Approach 1:
The adhesive layer is segmented into corner regions and central regions with different dimensions. The corner regions are intentionally reduced in size compared to a full-coverage design, which decreases moisture permeation in these vulnerable areas while the central region maintains adequate coverage for overall protection.
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
This configuration significantly decreases moisture permeation rates and reduces stress-related substrate deformation, enhancing the reliability and luminous efficacy of the organic light-emitting display device.
Implementation Method 1
an adhesive layer having a moisture-absorbing material
Data Source
AI summary
An organic light-emitting display device capable to improving the reliability is provided. The organic light-emitting display device may include an adhesive layer between a lower substrate and an upper substrate. Corner regions of the adhesive layer relatively disposed close to an edge of the lower substrate may include cutting portion, respectively. An align key may be disposed on the lower substrate exposed by the cutting portion of the corner region.