Display Device Input Sensor Bridge Patterns
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Solution Overview
Problem
Current display devices face challenges in reducing manufacturing costs and improving sensing reliability due to complex processes and high defect rates in input sensors, particularly short-circuits caused by residual layers or metal particles.
Innovation Solution
The display device incorporates a novel design with a first and second non-bending area and a bending area, featuring trace lines on different layers with bridge patterns that do not overlap, simplifying the manufacturing process and preventing short-circuits by increasing separation distances between bridge patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional input sensor manufacturing processes are used, then manufacturing complexity is high, but this leads to increased costs and shorter production time
Solution Approach 1:
The patent introduces multi-layer trace lines (first trace line on first insulating layer, second trace line on second insulating layer) to resolve the contradiction between manufacturing complexity and production time. By stacking trace lines on different layers with bridges connecting them, the design eliminates the need for complex contact hole formation through multiple insulating layers, thereby simplifying the manufacturing process while maintaining functional integrity.
2Area of stationary object
If trace lines are positioned closer together to reduce area, then area is reduced, but this increases short-circuit defect rate due to residual layers and metal particles
Solution Approach 1:
The patent positions trace lines on different insulating layers (first trace line on first insulating layer, second trace line on second insulating layer) to increase the vertical separation distance between conductive elements. This multi-layer configuration effectively prevents short-circuits caused by residual layers or metal particles while maintaining a compact overall area, as the trace lines are stacked rather than spread laterally.
Solution Approach 2:
The patent introduces bridge structures as intermediary elements that connect trace lines on different layers. These bridges are positioned in non-bending areas and facilitate electrical connection between layers while maintaining adequate separation in bending areas, thus preventing short-circuits while ensuring functional connectivity.
3Reliability
If contact holes are formed through multiple insulating layers to connect trace lines, then electrical connection is achieved, but this increases manufacturing complexity and cost
Solution Approach 1:
The patent extracts and eliminates the need for contact hole formation through multiple insulating layers by using bridge structures that connect trace lines on different layers in a simpler manner. The bridges are formed on the second insulating layer and connect to trace lines without requiring complex through-hole drilling and filling processes, thereby reducing manufacturing complexity while maintaining electrical connection reliability.
Data Source
AI summary
A display device includes a display panel including a first non-bending area, a bending area, and a second non-bending area, which are sequentially arranged in a first direction, and an input sensor including sensing electrodes and first and second trace lines. The first trace line includes a first line portion, a second line portion, and a first bridge connecting the first and second line portions and disposed on a layer different from the first and second line portions. The second trace line includes a third line portion, a fourth line portion disposed on a layer different from the third line portion, and a second bridge connecting the third and fourth line portions and disposed on a layer different from the third and fourth line portions. The first bridge and the second bridge do not overlap each other in a second direction perpendicular to the first direction.