Input Sensing Layer Structure to Prevent Display Short Circuits
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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 specific thickness ratios, along with a bending region and dummy lines to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional input sensing unit manufacturing process is used, then the manufacturing process can be completed with standard procedures, but the process becomes complex with multiple steps increasing costs and risk of short circuit defects
Solution Approach 1:
The patent extracts and removes the separate organic insulation layer from the conventional manufacturing process. By eliminating this layer, the process complexity is reduced while maintaining reliability through the designed thickness relationship between conductive layers that prevents short circuits.
Solution Approach 2:
The patent segments the sensing unit into distinct functional layers with specific thickness relationships. The first sensing conductive layer is designed with greater thickness than the second sensing conductive layer, creating a segmented structure that prevents short circuits while simplifying the overall manufacturing process.
2Ease of manufacture
If layers are removed to simplify manufacturing, then the number of manufacturing steps is reduced, but short circuits may occur within the input sensing unit reducing reliability
Solution Approach 1:
The patent changes the thickness parameters of the sensing conductive layers to resolve the contradiction. By setting the first sensing conductive layer thickness to be greater than the second sensing conductive layer thickness, the design prevents short circuits while allowing removal of the organic insulation layer, thus achieving both ease of manufacture and reliability.
3Reliability
If the first sensing conductive layer is made thicker to prevent short circuits, then reliability is improved, but the total thickness of the sensing unit increases
Solution Approach 1:
The patent applies local quality by concentrating the thickness increase only where needed for reliability (first sensing conductive layer) while keeping other layers thin. The first sensing conductive layer is made thicker than the second sensing conductive layer, providing localized protection against short circuits without significantly increasing the total thickness of the sensing unit.
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.