Inspection Signal Line Segmentation for Flat Panel Displays
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Solution Overview
Problem
During the inspection process of liquid crystal display panels, voltage differences between signal lines cause wire breakage due to the formation of connecting parts with insulating films at crossing points, leading to defects in signal lines.
Innovation Solution
The solution involves creating a crossover connection where one inspection signal line overlaps another and is divided into multiple lines separated by an insulating film, forming a multi-path connection to minimize wire breakage by allowing electrical continuity through alternative paths even if one path is broken.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a connecting part with insulating film is formed at the crossing point of inspection signal lines, then short circuit between lines is prevented, but wire breakage occurs due to voltage difference stress
Solution Approach 1:
The inspection signal line is divided into multiple segments (first inspection signal line and second inspection signal line) that cross the signal line at different positions. This segmentation distributes the voltage difference stress across multiple points rather than concentrating it at a single connecting part, thereby preventing wire breakage while maintaining short circuit prevention functionality.
2Device complexity
If inspection signal lines cross each other at a single point, then routing is simplified, but voltage difference causes wire breakage at the connecting part
Solution Approach 1:
The single crossing point is segmented into multiple crossing points by dividing the inspection signal line into first and second inspection signal lines. Each segment crosses the signal line separately, distributing the electrical stress and eliminating the wire breakage problem associated with single-point crossing while maintaining routing simplicity.
3Reliability
If multiple inspection signal lines are used to cross the signal line, then wire breakage is prevented through distributed stress, but device complexity increases
Solution Approach 1:
The inspection signal line is segmented into first and second inspection signal lines that cross the signal line at different positions. This segmentation provides distributed stress relief to prevent wire breakage while maintaining a relatively simple configuration by using only two segments rather than more complex multi-line arrangements.
Data Source
AI summary
A flat panel display device includes a display area where pixel cells are defined by each of a plurality of data signal lines and a plurality of gate signal lines, and a plurality of inspection signal lines for inspecting line defects in the data signal lines and the gate signal lines of the display area include a connecting part in which a divided signal line overlaps underlying inspection signal lines with an insulating film therebetween.