Touch Display Panel Layer Overlap to Prevent FMLOC Peeling
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Solution Overview
Problem
The touch function layer in Flexible Metal Layer on Cell (FMLOC) manufactured touch display panels is prone to peeling, leading to substrate failure, reduced production yield, and increased costs.
Innovation Solution
A touch display panel design with an inorganic dielectric layer and an organic protection layer stacked sequentially, where the orthographic projection of the inorganic dielectric layer is within the organic protection layer, and a minimum distance of 80 microns is maintained between their edges, along with a crack barrier and groove structure to prevent water vapor intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the touch function layer is manufactured using FMLOC process, then the touch display panel can be produced, but the touch film layer is prone to peeling which leads to substrate failure and reduced production yield
Solution Approach 1:
The invention segments the protective function into two separate layers: an inorganic dielectric layer for water vapor barrier and an organic protection layer for mechanical protection and stress relief. This segmentation allows each layer to specialize in its function, preventing the touch film layer from peeling while maintaining production yield.
Solution Approach 2:
The invention uses a composite structure combining inorganic dielectric material and organic protective material in a layered configuration. This composite approach leverages the advantages of both material types - the water vapor barrier properties of inorganic materials and the mechanical flexibility of organic materials - to prevent peeling and improve reliability.
2Reliability
If the inorganic dielectric layer and organic protection layer are stacked with proper overlap, then peeling is prevented, but the device structure becomes more complex
Solution Approach 1:
The inorganic dielectric layer serves multiple functions: it acts as a water vapor barrier, provides mechanical support, and when combined with the organic protection layer in a stacked configuration with overlap, it contributes to stress distribution and peeling prevention. This multi-functionality justifies the additional structural complexity.
3Reliability
If water vapor intrusion is minimized through proper layer configuration, then peeling issues are reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The inorganic dielectric layer is formed first as a preliminary water vapor barrier before the organic protection layer is added. This preliminary action of creating the barrier layer prevents water vapor intrusion from the beginning, addressing the root cause of peeling issues before final assembly is complete.
Data Source
AI summary
A touch-control display panel and a preparation method therefor, and a display apparatus, which relate to the technical field of display. The touch-control display panel comprises a base substrate, a display device layer and a touch-control functional layer, which are sequentially stacked. The touch-control functional layer comprises an inorganic dielectric layer and an organic protective layer that are sequentially arranged on the display device layer in a stacked manner, wherein the orthographic projection of at least part of the edge of the inorganic dielectric layer on the base substrate is located within the orthographic projection of the organic protective layer on the base substrate. The touch-control display panel has a better preparation yield.