Touch Panel Detection Line Layout for Corrosion Defect Screening
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Solution Overview
Problem
Existing touch panels face reliability issues due to defects in detection lines, particularly under high-temperature and high-humidity conditions, leading to potential corrosion and reduced manufacturing reliability.
Innovation Solution
Incorporation of detection lines in the touch panel design that overlap driving and sensing lines, allowing for current measurement to identify defective lines, and a method to inspect the panel for scratches and defects before shipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection lines are added to overlap driving and sensing lines for defect detection, then reliability is improved, but device complexity increases
Solution Approach 1:
The detection lines are merged with the existing driving and sensing lines by positioning them to overlap in the plan view. This integration allows the detection function to be added without requiring completely separate wiring, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The detection lines serve multiple functions: they detect defects in driving and sensing lines through current measurement, and simultaneously maintain electrical connection to the touch electrode arrays. This multi-functionality resolves the contradiction by making the added structure serve both detection and operational purposes.
2Manufacturing precision
If detection lines are disposed on the same layer as touch electrodes, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The detection lines are formed simultaneously with the driving and sensing lines during the same manufacturing process step. This preliminary action ensures precise alignment and overlap between detection lines and the lines they monitor, achieving high manufacturing precision without requiring additional alignment steps that would complicate manufacturing.
3Measurement precision
If current measurement is performed through detection lines to identify defective lines, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The inspection method uses current measurement through detection lines to provide feedback about the condition of driving and sensing lines. By measuring current values and comparing them against reference values, the system automatically identifies defective lines with high precision, resolving the contradiction between measurement precision and operational simplicity.
Data Source
AI summary
A touch panel includes a substrate including a sensing area and a peripheral area surrounding at least portion of the sensing area, a plurality of driving lines disposed in the peripheral area on the substrate, a plurality of sensing lines disposed on a same layer as the driving lines and disposed in the peripheral area, a first touch insulating layer covering the driving lines and the sensing lines, a first touch electrode array disposed in the sensing area on the first touch insulating layer and electrically connected to the driving lines, a second touch electrode array disposed on a same layer as the first touch electrode array and electrically connected to the sensing lines, and a plurality of detection lines disposed in the peripheral area on the first touch insulating layer and overlapping the driving lines and the sensing lines in a plan view.