Display Panel Test Wiring for Early Defect Detection
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Solution Overview
Problem
Existing display apparatus manufacturing processes lack effective methods for identifying defects during production, leading to reduced yield and quality issues.
Innovation Solution
Incorporation of a substrate with distinct display and non-display areas, including loopback and pad connection wires, along with a testing element group structure featuring dummy light-emitting elements and electrodes, to facilitate accurate resistance measurements and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inspection is performed only in the final product state, then the inspection process is simple, but defect detection capability is reduced and yield decreases
Solution Approach 1:
The patent incorporates test elements (dummy light-emitting elements, loopback wires, pad connection wires) into the display apparatus during the manufacturing process before final completion. These elements enable preliminary inspection at intermediate stages, allowing defects to be detected and corrected earlier in the production process, thereby improving defect detection capability without requiring complex post-manufacturing inspection systems
2Measurement precision
If loopback wire and pad connection wire have the same length, then the wiring structure is simple, but measurement accuracy is reduced due to noise interference
Solution Approach 1:
The patent applies different length specifications to different wire components based on their specific functions. The loopback wire has a different length than the pad connection wire, creating local variations in the wiring structure that optimize measurement accuracy by reducing noise interference while maintaining overall structural simplicity
Data Source
AI summary
A display apparatus according to one or more examples includes a substrate; a display area, and a non-display area outside the display area; a loopback wire located in the non-display area; and a pad connection wire in the non-display area. The pad connection wire may have a length that is different from the length of the loopback wire.