Touch Panel Metal Layer Integration for Process Reliability
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Solution Overview
Problem
The production of low temperature poly-silicon touch panel displays faces increased costs and process risks due to the separate fabrication of touch line traces and data lines, which complicates the manufacturing process and reduces reliability.
Innovation Solution
A touch display panel design where the touch line and light-shielding block are formed in the same metal layer, with a via connecting the common electrode layer to the touch line, allowing for shared processing and reduced manufacturing steps, thereby lowering costs and risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch line traces are fabricated with a separate photomask, then touch line functionality is achieved, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The patent combines the touch line trace and light-shielding block into the same metal layer, forming both structures simultaneously through a single photomask process. This merging eliminates the need for separate photomasks and fabrication steps, thereby reducing process complexity and improving process reliability while maintaining the touch functionality.
Solution Approach 2:
The metal layer serves multiple functions: it acts as both the touch line trace for touch sensing and the light-shielding block for display protection. By making the metal layer multi-functional, the patent eliminates the need for separate dedicated touch line structures, simplifying the manufacturing process and reducing costs.
2Reliability
If touch line traces are fabricated separately, then touch control functionality is achieved, but production cost increases
Solution Approach 1:
The patent merges the fabrication of touch line traces and light-shielding blocks into a single process step using one photomask. This consolidation reduces the number of manufacturing steps, lowers material and labor costs, and improves process reliability by reducing the cumulative effect of multiple fabrication steps.
Solution Approach 2:
The same metal layer and photomask are used to create both touch line traces and light-shielding blocks, making the manufacturing process more efficient and cost-effective. This multi-functional approach eliminates redundant processes and reduces overall production costs.
3Adaptability or versatility
If touch line and light-shielding block are in separate layers, then functional separation is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the touch line and light-shielding block into the same metal layer, reducing the overall layer structure complexity. This merging maintains functional separation through spatial arrangement within the same layer while simplifying the vertical layer stack and reducing manufacturing complexity.
Data Source
AI summary
The disclosure discloses a touch display panel and a manufacturing method thereof. The touch display panel includes: a substrate; a first metal layer including a touch line and a light-shielding block, disposed on the substrate; a TFT function layer disposed on the first metal layer, with the TFT function layer provided with a first via; and a common electrode layer located above the TFT function layer and connected to the touch line through the first via. In the above manner, the present disclosure can reduce the manufacturing cost and improve the process reliability.