Adhesive Layer Placement in Display Device Delamination Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self-luminous objects in display devices, such as OLEDs, tend to delaminate when subjected to physical stress, leading to non-light-emitting regions in the display area.
Innovation Solution
A display device configuration featuring pixel electrodes, an insulating layer with through holes, a light-emitting layer, a common electrode, a sealing layer, and an adhesive layer that adheres the counter substrate, with the adhesive layer located on areas not overlapping the light-emitting layer, reducing the force applied to the light-emitting layer during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive layer is applied over the light-emitting layer to ensure complete adhesion, then the bonding strength is improved, but the light-emitting layer becomes susceptible to delamination under physical stress
Solution Approach 1:
The adhesive layer is selectively positioned only in the first area where the insulating layer does not overlap the light-emitting layer. This local application ensures adequate bonding strength in regions where it is needed while avoiding direct contact with the light-emitting layer, thereby preventing delamination under physical stress.
Solution Approach 2:
The adhesive layer application is segmented into specific zones: it is applied in the first area (where insulating layer does not overlap light-emitting layer) but avoided in the second area (where insulating layer overlaps light-emitting layer). This segmentation allows the structure to achieve both bonding strength and delamination resistance.
2Reliability
If the display device structure is made more complex to prevent delamination, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The insulating layer is designed with through holes that create a predetermined first area where the adhesive layer can be applied. This preliminary structural design enables the adhesive to be positioned optimally before assembly, providing delamination resistance without requiring complex additional components or processes.
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 effectively prevents delamination of the self-luminous objects by distributing the applied force and maintaining the integrity of the light-emitting layer, ensuring consistent display performance even under physical stress.
Implementation Method 1
an adhesive layer that adheres the counter substrate to the sealing layer
Data Source
AI summary
A display device includes a plurality of pixel electrodes, an insulating layer that includes a plurality of through holes each overlapping each of the pixel electrodes and covers a periphery of each of the pixel electrodes, a light-emitting layer over at least one of the pixel electrodes, a common electrode on the insulating layer and the light-emitting layer, a sealing layer that seals the light-emitting layer and located on the common electrode, a counter substrate, and an adhesive layer that adheres the counter substrate to the sealing layer. An upper surface of the insulating layer has a first area which does not overlap the light-emitting layer in a plan view, and the adhesive layer is located at least on the first area.