Bending Protective Layer for Display Touch Electrode Corrosion
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Solution Overview
Problem
Touch members in display devices, especially those used in smartphones and tablets, face failure due to exposure of conductive layers to outside air and moisture, leading to corrosion and reduced device reliability.
Innovation Solution
The display device incorporates a touch member with a specific configuration of conductive and insulating layers, including a polarization member and a bending protective layer, to prevent exposure of the second touch conductive layer, thereby protecting it from external elements and ensuring the first touch conductive layer remains insulated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch member uses only two conductive layers without additional protective structures, then the manufacturing process is simple and device thickness is reduced, but the conductive layers become exposed to outside air and moisture causing corrosion and failure
Solution Approach 1:
The patent implements a nested protective structure where the bending protective layer is positioned within the non-active area region, and the polarization member is disposed on the bending protective layer. This nested arrangement provides multiple layers of protection for the conductive layers without significantly increasing overall device thickness, thereby improving reliability while controlling structural complexity.
Solution Approach 2:
The patent employs thin film structures including the bending protective layer and polarization member that provide protective functionality while maintaining device thinness. These thin films create a barrier against moisture and air penetration to the conductive layers without adding substantial thickness, resolving the contradiction between reliability improvement and device complexity increase.
2Reliability
If the touch member includes multiple conductive layers with insulation, then protection from moisture and air is improved, but the device thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent transitions from a simple planar layer structure to a multi-dimensional stacked configuration. The bending protective layer and polarization member are disposed in different spatial layers, creating a three-dimensional protective architecture that provides enhanced protection against moisture and air while managing the thickness through vertical stacking rather than horizontal expansion.
Solution Approach 2:
The patent applies protective structures selectively in the non-active area region rather than uniformly across the entire touch member. The bending protective layer and polarization member are positioned specifically where needed to protect conductive layers from exposure, providing localized protection that improves reliability without uniformly increasing device thickness across all areas.
Data Source
AI summary
A display device including a substrate having an active area and a non-active area and including a pad region and a bending region disposed between the active area and the pad region, light-emitting elements disposed on the substrate, and a touch layer having a main touch area corresponding to the active area, in which the touch layer includes touch electrodes disposed in the main touch area and touch lines connected to the touch electrodes, the main touch area corresponding to the active area and a portion of the touch lines corresponding to the non-active area, and the touch lines include a first touch line part disposed on an upper portion of the bending region, and a second touch line part disposed on a lower portion of the bending region, the upper portion of the bending region disposed between the active area and the lower portion of the bending region.