Foldable Screen ESD Protection Structure for RSE Control
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Solution Overview
Problem
Conventional electro-static discharge (ESD) protection structures for flexible screens in foldable electronic devices face challenges such as increased black edge width, radiated spurious emission (RSE) risks due to poor grounding, and secondary discharge due to gap changes during folding, which affect antenna performance and device stability.
Innovation Solution
An electro-static discharge protection structure with a metal partition wall and insulation frame, featuring a continuous conductive layer and insulation layer, ensures direct current insulation and effective grounding, preventing RSE and secondary discharge by conducting static electricity to the metal housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive adhesive is used to fasten the electro-static discharge protection structure to the metal housing, then grounding stability is improved, but the black edge width increases and antenna performance deteriorates due to RSE risk
Solution Approach 1:
The patent divides the grounding path into two separate segments: AC grounding through the metal partition wall and DC insulation through the insulation layer. This segmentation allows AC static electricity to be discharged while blocking DC current, preventing RSE without requiring conductive adhesive that would increase black edge width.
Solution Approach 2:
The metal partition wall acts as an intermediary structure between the electro-static discharge protection structure and the metal housing. It provides a dedicated AC grounding path through its connection to the housing, eliminating the need for conductive adhesive and its associated drawbacks.
2Device complexity
If the electro-static discharge protection structure is connected to the metal housing with a gap for discharge, then manufacturing complexity is reduced, but secondary discharge risk increases due to gap changes during folding
Solution Approach 1:
The patent employs a flexible insulation layer that can dynamically adapt to the folding deformation of the flexible screen. This dynamic flexibility maintains stable electrical insulation and consistent discharge performance throughout the folding process, preventing secondary discharge while accommodating structural changes.
Solution Approach 2:
The patent uses a composite structure combining metal partition wall and insulation layer. The metal provides rigid AC grounding connection, while the flexible insulation layer provides stable DC isolation that adapts to folding, creating a composite system that maintains reliability during deformation.
3Reliability
If the insulation layer is made thick to ensure DC insulation, then insulation performance is improved, but the overall device thickness increases
Solution Approach 1:
The patent changes the material parameters of the insulation layer by selecting materials with high dielectric strength and optimized mechanical properties. This allows the insulation layer to achieve sufficient DC insulation performance with reduced thickness, balancing electrical isolation requirements with device compactness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents RSE and secondary discharge, maintains antenna performance, and simplifies manufacturing by integrating the metal housing and partition wall, while using a stable insulation material to reduce interference.
Implementation Method 1
An insulation layer is disposed between the junction surface and the end surface
Implementation Method 2
A continuous conductive layer is disposed on the junction surface, the first surface, and the second surface
Implementation Method 3
the static electricity is conducted to the metal housing through the metal partition wall, and discharged by grounding
Data Source
AI summary
This application illustrates an electro-static discharge protection structure and an electronic device. One end of a metal partition wall (3) is connected to a metal housing (1), and the other end of the metal partition wall (3) extends in a direction away from the metal housing (1). An end surface (31) is formed at one end away from the metal housing (1). A screen module (4) is disposed on a side of the metal partition wall (3). An insulation frame (2) includes a first side edge (21), a connection part (22), and a second side edge (23). The first side edge (21) is disposed on a side, opposite to the screen module (4), of the metal partition wall (3). The connection part (22) is disposed at one end, away from the metal housing (1), of the first side edge (21). The connection part (22) includes a junction surface (221) attached to the end surface (31) and a first surface (222) facing the screen module (4). An insulation layer is disposed between the junction surface (221) and the end surface (31). The second side edge (23) is disposed on a side, facing the screen module (4), of the connection part (22). The second side edge (23) includes a second surface (231) facing the screen module (4). A continuous conductive layer is disposed on the junction surface (221), the first surface (222), and the second surface (231). The electro-static discharge protection structure in this application prevents a problem of RSE possibly caused by poor grounding and further affecting antenna performance, and prevents secondary discharge.