Display Device Adhesive Gap for ESD and Stress Relief
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Solution Overview
Problem
Current display devices face challenges with poor electrostatic discharge (ESD) protection and dislocation interference between the UV adhesive and optical functional film layers during the bending process, leading to excessive local stress on lines at their junction.
Innovation Solution
The display device incorporates an adhesive layer formed on the optical functional film layer, with its end adjacent to the bending region extending beyond the film layer and connecting with a protective layer. This configuration creates a gap between the optical functional film layer and the protective layer, preventing direct contact and dislocation interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UV adhesive is connected with the optical functional film layer to protect the display panel from ESD, then the ESD protection effect is improved, but dislocation interference occurs between the UV adhesive and the optical functional film layer during bending, resulting in excessive local stress on lines at their junction
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the protective layer (UV adhesive) and the optical functional film layer. This adhesive layer acts as a buffer that absorbs and distributes stress during bending, preventing direct contact between the protective layer and optical functional film layer, thereby eliminating dislocation interference while maintaining ESD protection through the protective layer.
2Reliability
If the protective layer spans across the fan-out regions and bending region to ensure continuous ESD protection, then the ESD protection coverage is improved, but dislocation interference occurs at the junction with the optical functional film layer during bending
Solution Approach 1:
The adhesive layer serves as a mediator that enables the protective layer to span continuously across the fan-out regions and bending region without causing dislocation interference. By decoupling the protective layer from direct contact with the optical functional film layer, the adhesive layer allows for continuous ESD protection coverage while simplifying the bending process.
3Reliability
If the UV adhesive is coated directly on the lines in the bending region to protect them, then the ESD protection is improved, but the direct contact with the optical functional film layer causes dislocation interference and excessive stress concentration
Solution Approach 1:
The adhesive layer acts as an intermediary that separates the protective layer from the optical functional film layer and lines. This separation prevents dislocation interference and stress concentration on the lines during bending, while the protective layer maintains its ESD protection function. The adhesive layer distributes stress uniformly, improving manufacturing precision.
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 solution enhances ESD protection while reducing local stress on lines at the junction of the protective and optical functional film layers, effectively addressing the issues of dislocation interference and stress accumulation.
Implementation Method 1
an adhesive layer formed on the optical functional film layer; wherein an end of the adhesive layer adjacent to the bending region extends beyond the optical functional film layer and is connected to the protective layer
Implementation Method 2
the protective layer is located in the bending region and spans a part of the first fan-out region and a part of the second fan-out region... can not only play a better ESD protection effect
Data Source
AI summary
The present application provides a display device comprising: a display panel including a display region and a non-display region, wherein the non-display region includes first and second fan-out regions and a bending region; an optical functional film layer formed in the display region and the first fan-out region; an adhesive layer formed on the optical functional film layer; and a protective layer located in the bending region and with a gap with the optical functional film layer, and an end of the adhesive layer extends beyond the optical functional film layer and is connected to the protective layer, and the adhesive layer covers the optical functional film layer, the gap, and part of the protective layer.