Inspection Line Configuration for Display Signal Defect Detection
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Solution Overview
Problem
High-resolution display devices with a large number of data lines face challenges in accurate defect inspection due to narrow intervals between signal lines, leading to potential inaccuracies in defect detection.
Innovation Solution
A display device design that includes a substrate with signal lines and inspection lines arranged in a specific configuration, where inspection lines are connected on different layers with an insulating layer in between, allowing for accurate and efficient inspection by ensuring sufficient spacing for inspection equipment to contact individual lines without simultaneous contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to achieve high resolution, then the display quality is improved, but the interval between adjacent data lines becomes narrower, making accurate defect inspection difficult
Solution Approach 1:
The inspection line is configured to extend in the first direction (perpendicular to data lines) and positioned at different vertical positions (different layers) to contact different data lines. This dimensional arrangement allows the inspection equipment to access and inspect each data line individually despite the narrow horizontal intervals between them.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the inspection line and the data lines. This insulating layer enables the inspection line to be positioned close to the data lines for effective inspection while maintaining electrical isolation and preventing simultaneous contact with adjacent data lines.
2Productivity
If the interval between inspection lines is narrowed to reduce inspection time, then the inspection efficiency is improved, but the inspection equipment may contact multiple inspection lines simultaneously, causing inaccurate results
Solution Approach 1:
The inspection lines are arranged at different vertical positions (different layers) rather than only horizontally adjacent. This vertical separation in the third dimension allows narrower horizontal spacing between inspection lines while preventing simultaneous contact by the inspection equipment, maintaining both efficiency and accuracy.
Solution Approach 2:
The insulating layer acts as a mediator that enables the inspection line to be positioned in close proximity to multiple data lines while ensuring that the inspection equipment contacts only one data line at a time through the insulated inspection line structure.
Data Source
AI summary
A display device and a method of inspecting signal lines of the display device facilitating inspection of a large number of signal lines are disclosed. According to one embodiment, the display device includes: a substrate; a first signal line disposed in a display area of the substrate; and a first inspection line disposed in a non-display area of the substrate and connected to the first signal line. The first inspection line includes: a first line connected to the first signal line; a second line disposed on a layer substantially the same as a layer on which the first line is disposed, the second line spaced apart from the first line; and a third line disposed on a layer different from the layer on which the first line and the second line are disposed with an insulating layer interposed therebetween, the third line overlapping at least a portion of the first line and a portion of the second line.