LCD Panel Signal Line Segmentation for Accurate Fault Detection
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Solution Overview
Problem
In conventional liquid crystal display (LCD) panel testing, test signals on odd-numbered and even-numbered detecting lines interfere with each other due to shared common electrode lines and voltage sources, leading to inaccurate detection of faults in data and scan lines.
Innovation Solution
The LCD panel is configured with signal lines divided into groups, each coupled to separate common electrode lines connected to distinct common voltage ports, with high impedance elements between the electrode lines and voltage ports, preventing signal interference during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common voltage source is used for both odd-numbered and even-numbered detecting lines, then device complexity is reduced, but test accuracy deteriorates due to signal interference between the two detecting lines
Solution Approach 1:
The patent divides the common voltage source into separate voltage sources for odd-numbered and even-numbered detecting lines. Specifically, odd-numbered detecting lines are connected to a first common voltage source, while even-numbered detecting lines are connected to a second common voltage source. This segmentation eliminates signal interference between the two detecting lines during testing, thereby improving test accuracy without significantly increasing overall device complexity.
2Ease of manufacture
If ESD protection circuits are shared between odd-numbered and even-numbered data lines, then manufacturing simplicity is improved, but test reliability deteriorates due to cross-talk between signal lines
Solution Approach 1:
The patent segments the ESD protection circuit connections by associating odd-numbered data lines with odd-numbered common electrode lines and even-numbered data lines with even-numbered common electrode lines. Each common electrode line is connected to its own dedicated common voltage source. This segmentation prevents cross-talk between odd and even signal lines during testing, ensuring reliable test results while maintaining manufacturing simplicity through a systematic connection pattern.
Data Source
AI summary
A display panel comprising a plurality of first and second signal lines, first and second detecting lines, a plurality of ESD protection circuits, and first and second common electrode lines. The first and second detecting lines are respectively coupled to the first signal lines and the second signal lines. Each ESD protection circuit is coupled to one of the first signal lines or one of the second signal lines. The first and second common electrode lines are respectively coupled to first and second voltage ports. Each first signal line is coupled to the first common electrode line through the corresponding ESD protection circuit. Each second signal line is coupled to the second common electrode line through the corresponding ESD protection circuit.