Display Panel Touch Layer Structure for Encapsulation Slope Etching
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Solution Overview
Problem
The large tilt angle of the encapsulation layer in display panels leads to poor etching effects, resulting in metal residues and poor flatness, which causes short circuits and reduces the reliability and performance of the display panel.
Innovation Solution
A display panel design with a substrate, inorganic and organic insulating layers, a light emitting layer, and a touch layer, featuring specific angles and thickness variations in the insulating sub-layers to mitigate the etching issues, ensuring smooth transitions and improved flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the encapsulation layer has a large tilt angle at the position between the display area and the bonding area, then the encapsulation layer transitions steeply in this area, but the large tilt angle causes the roughness of the surface of the layers to be larger and causes metal residues to remain at the position corresponding to the tilt angle
Solution Approach 1:
The patent divides the encapsulation layer into multiple segments with different tilt angles. Specifically, the encapsulation layer includes a first portion with a first tilt angle and a second portion with a second tilt angle that is smaller than the first tilt angle. This segmentation allows different regions of the encapsulation layer to have optimized angles for their specific functions, reducing metal residues and improving etching precision in critical areas while maintaining the necessary steep transition in other areas.
Solution Approach 2:
The patent applies local quality by making different parts of the encapsulation layer have different tilt angles according to their specific requirements. The first portion has a larger tilt angle for effective encapsulation, while the second portion has a smaller tilt angle to facilitate precise etching and reduce metal residues. This localized optimization of the tilt angle parameter resolves the contradiction between encapsulation effectiveness and etching precision.
2Shape
If the encapsulation layer has a large tilt angle at the position between the display area and the bonding area, then the encapsulation layer transitions steeply in this area, but the flatness of the formed layer is poor, which leads to short circuit problems between different metal wirings
Solution Approach 1:
The patent segments the encapsulation layer into multiple portions with different tilt angles to prevent short circuits. The first portion maintains a steep tilt for effective encapsulation, while the second portion has a reduced tilt angle that provides a gentler transition, improving flatness and preventing short circuits between metal wirings. This segmentation allows the structure to simultaneously achieve both encapsulation effectiveness and electrical isolation.
Solution Approach 2:
The patent applies local quality by optimizing the tilt angle of different encapsulation layer portions based on their specific functional requirements. The first portion has a larger tilt angle for encapsulation, while the second portion has a smaller tilt angle specifically at the bonding area interface to ensure proper flatness for subsequent metal layer formation, thereby preventing short circuits and improving reliability.
Data Source
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AI summary
The embodiments of the present invention provide a display panel and a display device, including a substrate, an inorganic insulating layer, an organic insulating layer, a light emitting layer, an encapsulation layer and a touch layer. The touch layer includes a first insulating sub-layer and a first metal sub-layer. The first insulating sub-layer is disposed between the touch wirings and the organic insulating portion of the organic insulating layer. By disposing the first insulating sub-layer, the problem of large roughness and poor flatness of surface of the layer after etching is improved, and the overall performance is improved.