Wiring Substrate Parallel Inspection Wiring for Display Panel Yield
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Solution Overview
Problem
Existing display panel technologies face challenges in detecting defects such as disconnection over the entire section of drive wiring while requiring a significant area for inspection wiring, which affects yield management and increases waste substrate area, limiting the number of display panels that can be cut from a mother glass.
Innovation Solution
A wiring substrate configuration with a parallel section where the inspection wiring is disposed close to and parallel with the drive wiring but not electrically connected, allowing for defect detection over the entire section of the drive wiring while minimizing the area required for inspection wiring, using conductive films formed in the same or different layers with an insulating film in between, and optionally overlapping to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inspection wiring is drawn out from a branch point in the middle of drive wiring, then inspection can be performed, but disconnection in the section from branch point to drive terminal cannot be detected
Solution Approach 1:
The drive wiring is divided into multiple sections by setting multiple branch points at different positions along the wiring. Each branch point connects to a separate inspection wiring, enabling independent inspection of each segment. This segmentation allows detection of disconnections in any specific section of the drive wiring.
Solution Approach 2:
Multiple inspection wirings are introduced as intermediary elements that connect to different sections of the drive wiring through branch points. These inspection wirings serve as mediators to detect defects in specific sections without interfering with the normal drive signal transmission.
2Measurement precision
If inspection element is disposed outside drive terminal, then inspection can be performed, but waste substrate area increases reducing number of display panels from mother glass
Solution Approach 1:
The inspection wirings are designed to serve multiple purposes: they enable defect detection in drive wiring sections while also being integrable into the overall substrate layout without requiring additional waste areas. The same substrate area serves both display production and inspection functions.
Solution Approach 2:
The inspection wirings are arranged in a parallel configuration alongside the drive wiring, utilizing the lateral dimension of the substrate. This dimensional arrangement allows inspection functionality to be integrated within the existing substrate footprint without expanding the waste area.
3Productivity
If inspection wiring area is reduced, then more display panels can be produced, but defect detection coverage may be compromised
Solution Approach 1:
The inspection system is segmented into multiple short inspection wirings, each responsible for a specific section of the drive wiring. This segmentation allows efficient use of substrate area while maintaining comprehensive defect detection coverage through the distributed arrangement of inspection points.
Data Source
AI summary
A wiring substrate includes an insulating base that has a plate surface; a first circuit that is provided on the plate surface; a first terminal that is provided on the plate surface, and to which a mounting member is attached; a second terminal that is provided on the plate surface; a first wiring that connects the first circuit and the first terminal to each other; and a second wiring that connects the first terminal and the second terminal to each other, is electrically connected to the first wiring in the first terminal, and has a parallel section in which the second wiring is disposed close to and parallel to the first wiring without being electrically connected to the first wiring outside the first terminal.