Boots Layer Display Structure for Fine-Pitch Short Prevention
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Solution Overview
Problem
In display devices with fine-pitch designs, precision deviations in chip positioning can cause the passivation layer to be squeezed and broken during compression, leading to shorts due to the close distance between the conductive and passivation layers.
Innovation Solution
Incorporating a boots layer below the metal layer, which is partially overlapped with the metal layer, and ensuring the passivation layer covers both, with a distance between the conductive and passivation layers of 5 um or less, using organic and inorganic materials for the boots and passivation layers to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the distance between the conductive layer and the passivation layer is reduced to achieve fine-pitch design, then the device density is improved, but the passivation layer is prone to breakage due to positioning deviation during compression
Solution Approach 1:
The patent introduces a boots layer as an intermediary structure between the conductive layer and the passivation layer. This boots layer extends from the conductive layer toward the passivation layer, creating a buffer zone that prevents direct contact and mechanical stress concentration. The intermediary boots layer absorbs positioning deviations and compression forces, thereby maintaining passivation layer integrity while enabling reduced spacing for fine-pitch design.
Solution Approach 2:
The patent employs organic materials with three-dimensional molecular structures and flexible conformational properties. These materials can adapt their shape and volume to accommodate positioning variations, effectively adding a dimensional buffer that absorbs mechanical stress. The organic boots layer and passivation layer materials provide multi-directional stress distribution, preventing focal points of stress concentration that would lead to breakage.
2Strength
If organic materials are used for the boots layer and passivation layer to improve flexibility, then the stretchability is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The patent utilizes the unique parameter properties of organic materials, specifically their molecular flexibility and phase transition characteristics. By controlling deposition parameters such as thickness, cross-linking density, and curing conditions, the organic boots layer and passivation layer achieve optimal balance between stretchability and manufacturing feasibility. The parameter optimization allows standard fabrication processes to be adapted for organic materials without requiring entirely new manufacturing approaches.
Data Source
AI summary
A display device includes a metal layer, a boots layer, a passivation layer, and a conductive layer. The boots layer is located below the metal layer. The boots layer is partially overlapped with the metal layer. The passivation layer covers the metal layer and the boots layer. The conductive layer covers the passivation layer and the metal layer. The conductive layer is overlapped with the boots layer along a direction of the orthogonal projection.