Input Sensing Layer Stack for Short-Circuit-Resistant Displays
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Solution Overview
Problem
Existing display device manufacturing processes for input sensing units are complex, costly, and prone to defects that reduce reliability due to the risk of short circuits.
Innovation Solution
A display device design with a simplified manufacturing process for the input sensing unit, featuring a first sensing insulation layer directly on the display panel, a first sensing conductive layer, a second sensing insulation layer covering the first, and a second sensing conductive layer with a thickness ratio of approximately 1.5 to 4.0 times, and a bending region with a dummy line to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional input sensing unit manufacturing process is used, then the sensing unit can be formed, but the process becomes complex and costly with increased risk of short circuits
Solution Approach 1:
The input sensing unit is divided into multiple distinct layers: a first sensing insulation layer, a first sensing conductive layer, a second sensing insulation layer, and a second sensing conductive layer. This segmentation allows each layer to be formed and processed independently, simplifying the manufacturing process while maintaining reliability by preventing short circuits through proper insulation between layers.
Solution Approach 2:
The patent introduces a vertical stacking dimension with multiple insulation and conductive layers arranged sequentially. This multi-layered vertical structure separates conductive elements that would otherwise be planar and adjacent, eliminating short circuit risks while organizing the sensing unit in a manageable hierarchical manner.
2Device complexity
If manufacturing steps are reduced by removing layers, then process complexity decreases, but short circuits occur within the input sensing unit
Solution Approach 1:
The patent applies different properties to different layers: the first sensing insulation layer provides insulation for the first conductive layer, while the second sensing insulation layer provides insulation for the second conductive layer. Each layer is optimized for its specific function, ensuring proper insulation where needed while maintaining a relatively simple overall structure that avoids short circuits without requiring excessive manufacturing steps.
Data Source
AI summary
Provided is a display device including a display panel including a display region and a non-display region, and an input sensing device disposed on the display panel. The input sensing device includes a first sensing insulation layer directly disposed on the display panel, a first sensing conductive layer disposed on the first sensing insulation layer, a second sensing insulation layer disposed on the first sensing insulation layer and covering the first sensing conductive layer, and a second sensing conductive layer disposed on the second sensing insulation layer. The second sensing insulation layer includes an organic film, and a first thickness of the first sensing conductive layer is greater than a second thickness of the second sensing conductive layer.