Display Device Power Line Moisture Barrier
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Solution Overview
Problem
Display devices face durability issues due to moisture and air permeation, particularly in their peripheral areas where power lines and drivers are located, leading to potential degradation and reduced performance.
Innovation Solution
The implementation of a moisture barrier structure in the display device's peripheral area, where power lines are disposed below the bending area and contacted by a touch insulating layer, forming line contact areas that delay or prevent external air and moisture permeation by contacting inorganic and conductive layers, thereby enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power lines are disposed in the peripheral area below the bending area, then the device complexity is reduced and ease of manufacture is improved, but moisture and air permeation occur leading to durability degradation
Solution Approach 1:
A touch insulating layer is introduced as an intermediary element between the power lines and the external environment. This layer contacts the power lines in the peripheral area and provides moisture and air barrier protection, preventing permeation while maintaining the simple power line configuration below the bending area
Solution Approach 2:
The solution employs a composite structure combining the conductive power line material with the insulating touch insulating layer. This composite arrangement provides both electrical conductivity for power transmission and protective barrier properties against moisture and air permeation
2Reliability
If a moisture barrier structure is implemented in the peripheral area, then durability is improved, but device complexity increases
Solution Approach 1:
The touch insulating layer serves multiple functions simultaneously: it provides moisture and air barrier protection for durability, maintains electrical insulation for power line operation, and supports the touch sensing function. This multi-functionality avoids adding separate dedicated moisture barrier components that would increase device complexity
Solution Approach 2:
The moisture barrier function is merged with the touch insulating layer rather than being implemented as a separate component. This consolidation integrates protection against permeation into an existing necessary element, preventing durability issues without increasing overall device complexity
3Reliability
If the touch insulating layer contacts the power lines, then moisture and air permeation is prevented, but the resistance characteristics of power lines may be compromised
Solution Approach 1:
The touch insulating layer is positioned to contact the power lines specifically in the peripheral area where moisture and air permeation is the concern. This localized contact provides protection where needed while maintaining proper resistance characteristics in the display area where precision electrical performance is critical
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
This solution effectively prevents moisture and air permeation, improving the display device's durability without compromising the resistance characteristics of the power lines, and allows for a more versatile positioning of the moisture barrier structure.
Implementation Method 1
a moisture barrier structure in which an inorganic layer and a conductive layer contact each other may be formed in the line contact areas. Accordingly, permeation of external air or moisture may be effectively delayed or effectively prevented by the moisture barrier structure
Data Source
AI summary
A display device includes a substrate including a display area, a first peripheral area surrounding the display area, a second peripheral area positioned in a first direction from the display area, and a bending area positioned between the first peripheral area and the second peripheral area, a first power line disposed in the second peripheral area on the substrate, where the first power line receives a first power voltage, a second power line disposed in the second peripheral area on the substrate, positioned farther from a center of the second peripheral area than the first power line, where the second power line receives a second power voltage, and a sensing layer disposed on the substrate, where sensing layer includes a touch electrode and a touch insulating layer contacting the first power line and the second power line in the second peripheral area.