Array Substrate Common Electrode Integration for In-Cell Touch
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Solution Overview
Problem
The manufacturing process of array substrates for in-cell touch screens is overly complex due to the requirement of additional metal layers and photo engraving processes.
Innovation Solution
An array substrate design that integrates a drive scan line, data line, first and second common electrodes, common transistor, and touch transistor, allowing for time-sharing display and touch scans without the need for a third metal layer, simplifying the manufacturing process by forming the first and second common electrodes in the same layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third metal layer (address lines) and insulating layer are added to achieve in-cell touch screen functionality, then touch screen performance is improved, but the manufacturing process complexity increases significantly
Solution Approach 1:
The patent merges the common electrode layer and address line layer into a single layer structure. The first common electrode extends in a first direction while the second common electrode extends in a second direction perpendicular to the first direction, forming integrated address line functionality without requiring a separate third metal layer. This combining approach maintains in-cell touch screen performance while eliminating the need for additional photo engraving processes.
Solution Approach 2:
The common electrode layer is designed to serve multiple functions simultaneously: it acts as both the common electrode for display operation and as the address lines for touch scanning. By making the common electrode layer multi-functional, the patent eliminates the need for dedicated address line structures, thereby simplifying the manufacturing process while maintaining both display and touch functionality.
2Adaptability or versatility
If additional metal layers and photo engraving processes are added to achieve in-cell touch functionality, then touch scan capability is improved, but production cost and process time increase
Solution Approach 1:
The patent combines the touch scan capability into the existing common electrode layer structure. The first and second common electrodes forming perpendicular extensions enable touch scanning in both directions without requiring additional metal layers or photo engraving processes, thereby maintaining full touch scan capability while improving production efficiency.
Data Source
AI summary
Disclosed is an array substrate and touch display device which belongs to the technical filed of display and is able to solve the technical problem that in the existing technologies, the process of manufacturing an array substrate is too complex. The array substrate includes a drive scan line, a data line, a first common electrode, a second common electrode, a touch scan line, a common transistor, and a touch transistor. The first common electrode and the second common electrode are arranged in a spaced-apart manner. A source and a drain of the common transistor are connected respectively to the first common electrode and the second common electrode, and a gate of the common transistor is connected to the drive scan line. A source and a drain of the touch transistor are connected respectively to the data line and the second common electrode, and a gate of the touch transistor is connected to the touch scan line.