Display Module Adhesive Modulus Layout for Narrow-Frame Bending
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Solution Overview
Problem
The bending of display modules with narrow frames leads to reverse acting stress on film layers, causing fractures and water/oxygen intrusion, which affects display quality.
Innovation Solution
A display module with a reinforced adhesive layer having varying elastic moduli, where the first sub-portion in the frame region has a higher elastic modulus than the second sub-portion in the display region, reducing the reverse acting force on film layers during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the bonding portion is bent toward the back of the display panel to reduce frame width, then the frame width is reduced, but the base film layers apply reverse acting stress on the encapsulation layer or metal wire layer causing fractures
Solution Approach 1:
The adhesive layer is divided into two sub-portions with different elastic moduli: a first sub-portion in the frame region with higher elastic modulus and a second sub-portion in the display region with lower elastic modulus. This segmentation allows the frame region to provide rigidity during bending while the display region maintains flexibility to accommodate stress without causing film layer fractures.
Solution Approach 2:
Different regions of the adhesive layer are assigned different local properties (elastic moduli) to meet different functional requirements. The first sub-portion in the frame region has higher rigidity to reduce reverse acting stress, while the second sub-portion in the display region has lower rigidity to maintain flexibility. This local quality differentiation resolves the contradiction between frame width reduction and film layer strength.
2Strength
If the adhesive layer has high elastic modulus to increase rigidity, then the reverse acting force on film layers is reduced, but the display region becomes too rigid affecting display quality
Solution Approach 1:
The adhesive layer implements local quality by having different elastic moduli in different regions. The first sub-portion in the frame region has higher elastic modulus to protect film layers from fractures, while the second sub-portion in the display region has lower elastic modulus to maintain display quality. This spatial differentiation of material properties allows simultaneous achievement of both film layer protection and display quality.
Solution Approach 2:
The adhesive layer is segmented into functionally distinct sub-portions that can independently optimize their mechanical properties for their respective regions. This segmentation enables the frame region to provide structural support while the display region maintains the flexibility needed for high-quality display performance.
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 increased rigidity of the lower frame region reduces the risk of film layer fractures, improving display quality and reliability.
Implementation Method 1
the at least one adhesive layer includes a first sub-portion and a second sub-portion, the first sub-portion is located in the first frame region, the second sub-portion is located in the display region and the first frame region, and the first sub-portion has an elastic modulus greater than the second sub-portion
Data Source
AI summary
A display module and a display device are provided; and the display module includes a display panel and at least one adhesive layer. The display panel includes a display function portion, a bonding portion and a bending portion. The display module includes a display region and a first frame region. The at least one adhesive layer includes a first sub-portion and a second sub-portion. The first sub-portion is in the first frame region, and the second sub-portion is in the display region and the first frame region. The first sub-portion has an elastic modulus greater than the second sub-portion.