Through-Hole Display Sensing Layout for Crack Localization
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Solution Overview
Problem
Existing display devices lack the ability to sense and locate cracks generated in non-display or optical areas, which can compromise the functionality and integrity of the device.
Innovation Solution
The display device incorporates a substrate with a display area, an optical area containing a through hole, and a non-display area, featuring first and second sensing lines and metal patterns connected to a sensing pad to detect cracks in these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing lines are extended into the optical area to detect cracks, then crack detection capability is improved, but the risk of false detection from metal patterns increases
Solution Approach 1:
The sensing line is divided into two distinct parts: a first sensing line in the non-display area and a second sensing line in the optical area. This segmentation allows each sensing line to independently detect cracks in its specific region, improving detection capability while isolating the metal pattern interference to only the second sensing line's evaluation.
Solution Approach 2:
The evaluation unit selectively evaluates only the second sensing line when a crack is detected in the optical area, rather than evaluating the entire sensing system. This partial evaluation approach reduces false detections by focusing only on the relevant sensing line affected by metal patterns in the optical area.
2Area of stationary object
If multiple sensing lines are added to cover different areas, then crack detection coverage is improved, but device complexity increases
Solution Approach 1:
Both the first and second sensing lines share the same basic structure and function of detecting cracks through resistance changes. The evaluation unit universally evaluates both sensing lines using the same methodology, allowing the system to detect cracks in different areas (non-display and optical) with a unified approach, thereby managing complexity while expanding coverage.
3Reliability
If metal patterns are added below the sensing line to improve electrical connection, then electrical conductivity is improved, but crack sensing precision deteriorates due to interference
Solution Approach 1:
The evaluation unit performs partial evaluation by focusing specifically on the second sensing line's resistance changes when detecting cracks in the optical area. This selective evaluation methodology compensates for the interference caused by metal patterns by attributing resistance changes specifically to the second sensing line's interaction with cracks, thereby maintaining measurement precision despite the presence of metal patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the detection and localization of cracks in non-display and optical areas, ensuring the device's functionality and integrity by identifying disconnections in the sensing lines based on resistance changes.
Implementation Method 1
identifying disconnections in the sensing lines based on resistance changes
Data Source
AI summary
A display device according to an exemplary embodiment of the present disclosure includes a substrate which includes a display area, an optical area disposed in the display area and including a through hole, and a non-display area, a first sensing line which is disposed in the non-display area and encloses an outer periphery of the display area, a second sensing line which is disposed inside more than the first sensing line and encloses an outer periphery of the display area and the through hole, and a plurality of metal patterns which is disposed along an outer periphery of the through hole below the second sensing line, and at least one of the plurality of metal patterns is electrically connected to the second sensing line. Accordingly, when a crack is generated in the non-display area or the optical area, a location where the crack is generated may be distinguished.