Display Adhesive Interlayer for Bezel-Blocked Curing Verification
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Solution Overview
Problem
Photo-curable adhesive layers in display devices, such as LCD and OLED displays, face issues with weak initial adhesive force and degradation over time, particularly under the bezel portion where light curing is obstructed, leading to non-curing defects and reduced adhesive strength.
Innovation Solution
Incorporating an interlayer with ultrasound transmitting areas between the bezel portion and the adhesive layer, allowing for accurate curing verification using ultrasonic waves, ensuring the adhesive layer achieves stable bonding by preventing non-curing defects beneath the bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photo-curable adhesive layer is used to bond the display panel and window, then the adhesive provides stable bonding after curing, but the adhesive has weak adhesive force when not sufficiently cured and may experience degradation of adhesiveness over time
Solution Approach 1:
The patent applies preliminary action by introducing an ultrasound transmitting area that enables verification of adhesive curing before the adhesive fully sets. This allows the manufacturing process to confirm proper curing early, preventing subsequent adhesive degradation and ensuring consistent bonding strength from the outset.
Solution Approach 2:
The patent implements feedback by using ultrasonic waves to detect the curing state of the adhesive layer. The ultrasound transmitting area allows real-time monitoring of adhesive curing progress, providing feedback that enables adjustment of curing parameters to optimize both initial adhesive force and long-term stability.
2Strength
If the bezel portion is positioned to overlap the non-display area for structural support, then the device gains mechanical strength, but the adhesive layer beneath the bezel portion cannot be sufficiently cured due to light obstruction
Solution Approach 1:
The patent uses an intermediary approach by introducing ultrasound waves as a mediator to verify adhesive curing beneath the bezel portion. Since light cannot penetrate the bezel to cure the adhesive underneath, ultrasonic waves serve as an alternative detection mechanism to confirm proper curing in this shadowed region.
Solution Approach 2:
The patent replaces the optical curing verification system with an ultrasonic detection system. Instead of relying on light transmission to verify curing (which fails beneath the opaque bezel), the patent uses mechanical ultrasonic waves that can penetrate and detect the curing state of the adhesive layer in regions blocked from light.
3Area of stationary object
If the adhesive layer is applied uniformly across the entire bonding area including beneath the bezel, then complete coverage is achieved, but non-curing defects occur in the bezel overlap region
Solution Approach 1:
The patent applies local quality by distinguishing between different regions of the adhesive layer. The ultrasound transmitting area is specifically positioned to monitor the curing state beneath the bezel portion, allowing differentiated verification of curing quality in regions with different light accessibility. This enables targeted quality control for the problematic bezel overlap region.
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 ensures a stable and long-lasting adhesive bond between the display panel and the window, preventing adhesive degradation and maintaining the structural integrity of the display device.
Implementation Method 1
The interlayer has at least one ultrasound transmitting area overlapping the bezel portion
Data Source
AI summary
A display device includes a display panel having a display area and a non-display area. A window is disposed on the display panel. A bezel portion is disposed on the window. The bezel portion at least partially overlaps the non-display area. An adhesive layer is disposed between the display panel and the window. An interlayer is disposed between the bezel portion and the adhesive layer. The interlayer has at least one ultrasound transmitting area overlapping the bezel portion.