Display Wiring Layout With Dummy Patterns for AOI Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display apparatuses, overlapping wirings cause detection errors during automatic optical inspection due to shading differences, leading to inaccurate defect identification.
Innovation Solution
A display apparatus is designed with a dummy wiring structure comprising first and second dummy wiring portions that overlap driving and common voltage input units, respectively, arranged in a specific pattern to minimize shading effects and improve inspection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wirings in different layers are arranged to overlap each other, then the wiring density and signal transmission efficiency are improved, but detection errors occur during automatic optical inspection due to shading differences
Solution Approach 1:
The patent creates a dummy wiring structure that copies the appearance and arrangement of actual wirings in the fan-out area. This dummy wiring is specifically designed to replicate the shading pattern that would be seen in an optical inspection, allowing the inspection system to distinguish between real wiring defects and normal shading variations caused by overlapping wirings.
Solution Approach 2:
The dummy wiring acts as an intermediary element between the overlapping wirings and the optical inspection system. By placing this intermediate structure, the patent mediates the interaction between the complex wiring layout and the inspection process, providing a reference that helps the inspection system correctly interpret the shading patterns without misidentifying them as defects.
2Reliability
If dummy wiring portions are added to reduce detection errors, then inspection reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The dummy wiring structure is merged with the existing wiring layers and is formed using the same manufacturing processes as the actual wirings. By combining the dummy wiring formation with the existing wiring fabrication steps, the patent adds the necessary inspection reference structures without requiring separate, additional processing steps, thus minimizing the increase in device complexity.
Solution Approach 2:
The dummy wiring structure serves multiple functions: it provides a reference for optical inspection, replicates the shading pattern of actual wirings, and is formed using the same manufacturing processes as the functional wirings. This multi-functionality reduces the need for separate structures and processes, thereby limiting the increase in overall device complexity while maintaining improved inspection reliability.
Data Source
AI summary
A display apparatus includes: a substrate including a display area and a peripheral area outside the display area; a driving voltage input unit in the peripheral area; a common voltage input unit in the peripheral area and spaced apart from the driving voltage input unit; a signal wiring portion including a plurality of fan-out wirings that overlap the driving voltage input unit and the common voltage input unit; a first dummy wiring portion outside the signal wiring portion and including a plurality of first dummy wirings that overlap the driving voltage input unit; and a second dummy wiring portion outside the signal wiring portion and including a plurality of second dummy wirings that overlap the common voltage input unit.