OLED Display Panel Heat-Sensitive Adhesive Narrow Bezel
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Solution Overview
Problem
Conventional OLED display panels face issues with wide groove widths, large bending radii, and wide bezels due to precision errors in die cutters and fitting tolerances, making it difficult to achieve ultra-narrow bezel designs.
Innovation Solution
A display panel with a heat-sensitive adhesive layer having two states of viscosity, where a low viscosity facilitates precise laser grooving and a higher viscosity ensures strong bonding, combined with a femtosecond laser process to form notches in the bending area, effectively reducing the groove width and improving bonding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If die cutters are used to groove backplanes, then the grooving process can be completed, but the groove width becomes relatively wide due to precision errors and fitting tolerances
Solution Approach 1:
The patent replaces the mechanical die cutting system with a laser processing system. The laser beam can precisely groove the backplane material without mechanical contact, eliminating the precision errors and fitting tolerances inherent in mechanical die cutters. This substitution enables ultra-narrow groove widths while maintaining manufacturing feasibility through non-contact processing.
Solution Approach 2:
The patent changes the grooving method from mechanical to optical/thermal parameters. By controlling laser parameters such as beam intensity, pulse duration, and scanning speed, the groove width can be precisely controlled at the micro-scale level, achieving widths far narrower than what mechanical methods can accomplish while maintaining ease of manufacture.
2Length of moving object
If the bending area length is reduced to achieve narrow bezels, then the bezel width decreases, but the bonding quality may be compromised
Solution Approach 1:
The patent applies preliminary action by pre-processing the backplane material before bonding. The backplane is grooved and prepared in advance, and the adhesive is pre-applied to the bonding area. This ensures that when the bending area is folded, the bonding surfaces are already optimized for strong adhesion, maintaining bonding quality even with reduced bending area length.
Solution Approach 2:
The patent uses a composite adhesive system combining pressure-sensitive adhesive with heat-sensitive adhesive properties. This composite adhesive provides both immediate bonding capability and enhanced bond strength through thermal activation, ensuring reliable bonding in the reduced bending area without compromising connection strength.
3Ease of manufacture
If pressure-sensitive adhesive is used to attach backplanes, then the attachment process is simple, but the bonding strength is insufficient for narrow bezel designs
Solution Approach 1:
The patent employs a composite adhesive layer combining pressure-sensitive adhesive components with heat-sensitive adhesive components. The pressure-sensitive portion provides immediate attachment during assembly, while the heat-sensitive portion activates upon heating to provide enhanced bonding strength. This composite approach maintains manufacturing simplicity while achieving the required bonding strength for narrow bezel designs.
Solution Approach 2:
The patent changes the adhesive properties through temperature parameter control. The adhesive transitions from a low-viscosity state during application (allowing simple attachment) to a high-viscosity state after heating (providing strong bonding). This parameter change enables both ease of manufacture and sufficient bonding strength to be achieved in the same adhesive system.
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 solution significantly reduces the width of the bending area and ensures high bonding quality, enabling the production of OLED display panels with narrower bezels and improved grooving accuracy.
Implementation Method 1
the heat-sensitive adhesive layer is provided with a first state and a second state, wherein the heat-sensitive adhesive layer has a first viscosity to the display panel body in the first state, a second viscosity to the display panel body in the second state, and the second viscosity is greater than the first viscosity
Implementation Method 2
forming, by performing a laser process on the backplane in the bending area to remove the backplane in the bending area
Data Source
AI summary
A display panel and a method of manufacturing the same, and a display device are provided. The display panel includes a display panel body and a backplane arranged on a backlight side of the display panel body. The display panel body includes a display area, a bending area, and a bonding area. The bending area is located between the display area and the bonding area. The display panel includes a heat-sensitive adhesive layer disposed between the backplane and the display panel body.