Display Panel Retaining Wall for Narrow-Bezel PI Adhesion
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Solution Overview
Problem
Current display panel technologies face challenges in achieving uniform PI coating and film thickness in narrow frame areas, leading to poor adhesion between the PI material and the sealing layer, especially when the panels are bent, due to overlapping issues.
Innovation Solution
A display panel design featuring a driver circuit layer with a metal layer and gaps, an insulating layer embedded in the gaps, a plastic layer, a sealing layer, a retaining wall, and an insulating film positioned between the plastic and sealing layers, which prevents the insulating film from overlapping the sealing layer, improving adhesion and reliability against temperature and humidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between PI and AA area is reduced to achieve narrow frame, then the frame width is reduced, but the adhesion between PI and sealing layer deteriorates due to overlapping
Solution Approach 1:
A retaining wall structure is introduced as an intermediary element between the PI area and the sealing layer. This retaining wall prevents direct contact and overlapping between the PI material and the sealing layer, thereby maintaining adhesion quality while enabling narrow frame design. The retaining wall acts as a mediator that resolves the conflict between reduced frame width and maintained adhesion.
Solution Approach 2:
The structure is segmented by introducing the retaining wall that divides the space between the PI area and sealing layer. This segmentation prevents the PI material from directly overlapping with the sealing layer, thus maintaining adhesion while achieving narrow frame dimensions.
2Reliability
If the overlapping area between PI area and sealing layer is reduced to improve adhesion, then the adhesion quality is improved, but the space for precision coating becomes more constrained
Solution Approach 1:
The retaining wall serves as an intermediary structure that creates a physical barrier between the PI area and sealing layer. This intermediary structure reduces the overlapping area to improve adhesion while providing a defined space that facilitates precision coating operations.
3Length of moving object
If the distance between PI and AA area is reduced for narrow frame design, then the frame width is reduced, but the process control requirement for uniform PI coating increases
Solution Approach 1:
The retaining wall acts as an intermediary structure that defines the boundary between the PI area and sealing layer. This intermediary element provides a physical reference that helps maintain uniform PI coating thickness while enabling narrow frame design, as the retaining wall structure guides the coating process.
Data Source
AI summary
A display panel and a display device are provided. A retaining wall is disposed on a middle position of a driver circuit layer, the retaining wall can prevent an insulating film from overlapping a whole sealing layer in an insulating film coating process, which improves adhesion of the display panel and reliability against high temperature and high humidity, thereby improving quality of the display panel.