Display Input Sensor Inspection Lines for Signal-Line Protection
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Solution Overview
Problem
Existing display devices face manufacturing defects in input sensors, such as touch panels, which are not effectively addressed by current inspection methods.
Innovation Solution
The display device incorporates a defect inspection line with dummy electrodes, transparent conductive oxide inspection lines, and sensing electrodes with bridge patterns, allowing for comprehensive defect detection and protection of signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inspection lines are added to detect defects in input sensors, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The inspection lines are merged with the existing signal lines of the input sensor, allowing both inspection and signal transmission functions to be performed by the same structural element. This reduces device complexity while maintaining defect detection capability.
Solution Approach 2:
The inspection lines are designed to serve multiple functions: they act as both inspection paths for detecting defects and as signal lines for normal sensor operation. This multi-functionality improves reliability without proportionally increasing device complexity.
2Measurement precision
If dummy electrodes are introduced for inspection purposes, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Dummy electrodes are introduced as simplified copies of the actual sensing electrodes, providing the same inspection functionality without the full complexity of complete sensor elements. These dummy electrodes replicate only the essential electrical characteristics needed for defect detection.
Solution Approach 2:
The inspection function is segmented from the complete sensor structure, with dummy electrodes handling only the inspection task. This separation allows for simplified inspection elements that improve measurement precision without requiring the full complexity of operational sensing electrodes.
3Reliability
If inspection lines overlap with signal lines, then defect detection coverage is improved, but harmful factors increase due to potential interference
Solution Approach 1:
An insulating layer is introduced as an intermediary between the inspection lines and signal lines that overlap in space. This insulating layer prevents electrical interference while allowing the inspection lines to maintain their overlapping position for comprehensive defect detection coverage.
4Reliability
If comprehensive inspection coverage is achieved by extending inspection lines, then defect detection capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The inspection lines are merged with existing signal line routing, inheriting the alignment and positioning already established for signal transmission. This approach achieves comprehensive inspection coverage without imposing additional manufacturing precision requirements, as the inspection lines follow the same precisely-defined paths as the signal lines.
Data Source
Figure 1A
Figure 1B
Figure 1C~1D
AI summary
A display device includes a display panel and an input sensor on the display panel, the input sensor including sensing electrodes, signal lines connected to the sensing electrodes, an insulating layer on the signal lines, and inspection lines on the insulating layer and electrically connected to each other, each of the inspection lines respectively overlapping a corresponding one of the signal lines.