Display Panel Protective Structure Against Polarizer-Induced Corrosion
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Solution Overview
Problem
Existing touch panel structures suffer from signal line corrosion due to iodine precipitation in the polarizer layer, leading to short circuits under high temperature and humidity conditions.
Innovation Solution
A display panel design that includes a protective structure covering the touch layer in the spacing region, comprising a flexible circuit board and polarizer layer, with additional adhesive and covering layers to prevent exposure and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polarizer layer is attached to the touch screen surface, then the display function is achieved, but iodine precipitation causes signal line corrosion under high temperature and humidity conditions
Solution Approach 1:
A protective structure is introduced as an intermediary element between the polarizer layer and the signal lines. This protective structure includes a first protective layer covering the signal lines in the spacing region, and a second protective layer covering the first protective layer, creating a barrier that prevents iodine from the polarizer layer from reaching and corroding the signal lines under high temperature and humidity conditions.
Solution Approach 2:
The harmful iodine component is effectively isolated from the signal lines by removing the direct contact path. The protective structure extracts the signal lines from the corrosive environment by covering them with protective layers, separating the iodine source in the polarizer layer from the vulnerable signal lines in the spacing region.
2Ease of operation
If the touch layer is contiguously arranged in the display region and bonding region, then the touch function is achieved, but the signal lines in the spacing region are exposed and vulnerable to corrosion
Solution Approach 1:
Different regions of the touch layer are treated differently to address their specific needs. The touch layer maintains continuity in the display region and bonding region for touch functionality, while the spacing region receives enhanced local protection through the protective structure. This local quality approach allows the signal lines in the spacing region to be covered without disrupting the overall touch layer continuity required for touch operation.
3Reliability
If the flexible circuit board is bonded to the touch layer in the bonding region, then the electrical connection is achieved, but the spacing region remains exposed without protection
Solution Approach 1:
The protective structure is segmented into multiple functional layers: a first protective layer that directly covers the signal lines in the spacing region, and a second protective layer that covers the first protective layer. This segmentation allows each layer to perform its specific protective function while maintaining overall structural integrity and electrical connection reliability in the bonding region.
Data Source
AI summary
Provided is a display panel including: a display substrate, including a display region, a bonding region, and a spacing region disposed between the display region and the bonding region; a touch layer, disposed on a surface of the display substrate and contiguously arranged in the display region, the spacing region, and at least part of the bonding region; a polarizer layer, disposed on a side, distal from the display substrate, of the touch layer and arranged in the display region; a flexible circuit board, connected to the touch layer in the bonding region, wherein the flexible circuit board and the polarizer layer are disposed on one surface of the touch layer; and a protective structure, covering the touch layer in the spacing region.