Touch Display Panel Edge Protection at the Bending Area
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Solution Overview
Problem
The oxidation and corrosion of metal layers at the periphery of bending areas in display panels occur, reducing the effectiveness and lifespan of display devices.
Innovation Solution
A display device design featuring a substrate with a display area and a non-display area that includes a bending area, where a first metal layer is overlapped by a first via layer and a second metal layer, with an inorganic layer and passivation layer positioned outside the bending area to protect against oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is bent toward the rear surface to increase the display area ratio, then the display area ratio is improved, but the metal layer is oxidized and corroded at the periphery of the bending area
Solution Approach 1:
The patent divides the inorganic layer into multiple segments with different lateral positions. The first inorganic layer is positioned at the first lateral side outside the bending area, while the second inorganic layer is positioned at the second lateral side overlapping the bending area. This segmentation allows each segment to serve different protective functions, preventing metal layer oxidation at the bending periphery while maintaining the bent configuration for increased display area.
Solution Approach 2:
The patent applies different inorganic layer configurations to different local regions. At the first lateral side (outside bending area), a first inorganic layer is applied, while at the second lateral side (overlapping bending area), a second inorganic layer is applied. This local differentiation ensures that the metal layer receives appropriate protection in each specific location, preventing oxidation at the vulnerable bending periphery while maintaining structural integrity.
2Reliability
If the inorganic layer is positioned to protect metal layers from oxidation, then the reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The inorganic layer is designed to serve multiple functions simultaneously. It acts as a protective barrier against oxidation and corrosion for the metal layers, while also serving as part of the overall device structure that supports the bent configuration. The same inorganic layer provides both protective functionality and structural support, reducing the need for additional separate components and minimizing overall device complexity.
Data Source
AI summary
A display device includes: a substrate including a display area at a front surface and a non-display area at a periphery of the display area, wherein the non-display area includes a bending area having at least a portion bent toward a rear surface; a first metal layer on the substrate, the first metal layer overlapping with a contact hole at an out side of the bending area in the non-display area; a first via layer as an organic layer, located over the first metal layer, the first via layer including the contact hole; a second metal layer on the first via layer, the second metal layer being electrically connected to the first metal layer in the contact hole; and an inorganic layer on the second metal layer, wherein at least a portion of one side end of the inorganic layer, which is in the non-display area, is at an outside of the bending area and an area on the contact hole.