On-Cell Touch Display Inorganic Layer Layout for Transmittance
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Solution Overview
Problem
On-cell type built-in touch panel display devices experience a decrease in transmittance due to the organic film covering the wiring line pattern, and the organic film's low water resistance leads to wiring line corrosion, affecting the reliability of the touch panel.
Innovation Solution
The display device incorporates a configuration with multiple inorganic insulating layers, including openings in the light-emitting regions and covering the wiring lines with inorganic films to prevent moisture ingress and corrosion, while maintaining transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic film is used to cover the wiring line pattern, then the wiring line is protected, but transmittance in the transmissive region decreases
Solution Approach 1:
The patent changes the material parameter from organic film to inorganic insulating film. The inorganic insulating film has different optical properties with higher transmittance while providing equivalent or superior protection for the wiring line pattern, thus resolving the contradiction between protection and transmittance.
Solution Approach 2:
The patent uses a composite structure combining inorganic insulating film with the touch panel wiring lines. This composite material approach allows the inorganic film to provide both mechanical protection and optical transparency, simultaneously achieving wiring line protection and maintaining high transmittance.
2Reliability
If an organic film is used to cover the wiring line pattern, then the wiring line is protected, but water resistance is insufficient leading to corrosion
Solution Approach 1:
The patent changes the material parameter from organic film to inorganic insulating film. The inorganic insulating film possesses inherent high water resistance properties, effectively blocking moisture and atmospheric components from reaching the wiring lines, thus preventing corrosion while maintaining protection functionality.
Solution Approach 2:
The inorganic insulating film provides a more durable and long-lasting protection solution compared to organic film. Its superior water resistance ensures long-term reliability of the wiring lines without degradation from moisture exposure, eliminating the need for frequent replacement or maintenance.
3Reliability
If multiple inorganic insulating layers are added, then water resistance and protection are improved, but device complexity increases
Solution Approach 1:
The patent segments the protection function into multiple inorganic insulating layers, where each layer contributes to the overall water resistance and protection. This segmentation allows for optimized thickness and material selection in each layer, achieving superior protection while maintaining manufacturing feasibility through standardized layer-by-layer fabrication processes.
Data Source
AI summary
A display device includes: a substrate; an interlayer insulating layer configured to cover a plurality of wiring lines on the substrate; a light-emitting element on the interlayer insulating layer; a sealing layer configured to cover the light-emitting element; a first inorganic insulating layer configured to cover the sealing layer; a first detection electrode extending in a first direction on the first inorganic insulating layer; a second inorganic insulating layer configured to cover the first detection electrode and the first inorganic insulating layer; a second detection electrode extending in a direction intersecting the first direction on the second inorganic insulating layer; and a third inorganic insulating layer configured to cover the second detection electrode and the second inorganic insulating layer, wherein the first inorganic insulating layer, the second inorganic insulating layer, and the third inorganic insulating layer are provided with an opening in a region corresponding to a light-emitting region.