Display Panel Bridge Layout for Better Bending Resistance
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Solution Overview
Problem
Conventional display devices with wide connecting bridge areas suffer from poor bending performance and are prone to fracture due to the use of metal layers with low bending resistance, such as molybdenum, which affects the display's mechanical properties during stretching.
Innovation Solution
A display panel design featuring a stacked arrangement of multiple metal layers, including a first, second, and third metal layer, patterned to form metal traces, reduces the overall width of the connection bridge region, enhancing bending resistance by distributing metal traces across multiple layers and reducing the number of traces in each layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal layers containing molybdenum are used to make metal traces in the connecting bridge areas, then the metal traces can be formed with conventional materials, but the bending resistance of the connecting bridge areas deteriorates
Solution Approach 1:
The patent changes the material composition parameter of the metal layers by replacing molybdenum with titanium, which has superior bending resistance properties. This parameter change resolves the contradiction by selecting a material that simultaneously provides ease of manufacture and high bending resistance.
Solution Approach 2:
The patent employs a composite metal layer structure with multiple layers (including titanium, aluminum, and other metals) to achieve both ease of manufacture and high bending resistance. The composite structure combines the advantages of different materials to resolve the contradiction between conventional material usage and bending performance.
2Reliability
If metal traces in the connecting bridge areas are formed in parallel in a same layer with spacing to prevent short circuits, then electrical insulation is ensured, but the width of the connecting bridge areas increases, deteriorating bending performance
Solution Approach 1:
The patent transitions metal traces from a two-dimensional parallel arrangement in a single layer to a three-dimensional stacked arrangement across multiple layers. This dimensional change allows traces to be vertically separated rather than horizontally spaced, reducing the width of connecting bridge areas while maintaining electrical insulation and preventing short circuits.
Solution Approach 2:
The patent segments the metal traces into multiple separate layers, with each layer containing fewer traces. This segmentation reduces the horizontal spacing required in each layer, thereby reducing the overall width of the connecting bridge areas and improving bending performance while maintaining reliability.
3Strength
If the width of the connecting bridge areas is reduced to improve bending performance, then the risk of fracture during stretching decreases, but the complexity of the metal layer structure increases
Solution Approach 1:
The patent uses vertical stacking of metal layers to achieve trace separation, which reduces horizontal width while adding vertical complexity. This dimensional transition manages the complexity-tradoff by organizing traces in the vertical dimension rather than increasing horizontal spacing.
Solution Approach 2:
The patent employs universal metal layer structures and manufacturing processes that can be applied across different display device configurations. The stacked metal layer approach serves multiple functions (electrical connection, insulation, mechanical strength) simultaneously, managing complexity through multi-functionality rather than separate dedicated structures.
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes a plurality of pixel island regions spaced apart from each other. A plurality of connection bridge regions connecting adjacent ones of the pixel island regions to each other. At least one of the connection bridge regions includes a first metal layer, a second metal layer, and a third metal layer disposed in a stacked arrangement, and each of the first metal layer, the second metal layer, and the third metal layer is patterned into at least one metal trace.