Floating Electrode Data Line for Display Substrate Warping
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Solution Overview
Problem
In liquid crystal displays, increasing the thickness of wiring to reduce RC delay can lead to substrate warping due to differences in expansion coefficients, causing faults such as stains, and existing methods fail to decrease wiring resistance without increasing thickness or affecting the aperture ratio.
Innovation Solution
A display substrate design featuring a floating electrode electrically connected to the data line, which decreases resistance without increasing the data line's width or thickness, thereby preventing substrate warping and maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the wiring is increased to decrease resistance and improve charging rate, then the resistance of the wiring is decreased, but the substrate may warp due to a difference in the expansion coefficients of the wiring and the substrate
Solution Approach 1:
The invention introduces a floating electrode extending in the second direction (transverse direction) to create an additional electrical conduction path. This dimensional approach allows current to flow through both the data line and the floating electrode, effectively decreasing resistance without increasing the thickness of the data line itself, thus avoiding substrate warping while improving charging rate.
2Reliability
If the thickness of the wiring is increased to decrease resistance, then the resistance of the wiring is decreased, but faults including stains may occur due to substrate warping
Solution Approach 1:
The floating electrode extends in the second direction perpendicular to the data line direction, creating a transverse conduction path. This allows the electrical signal to bypass high-resistance sections of the data line through the floating electrode, decreasing overall resistance without requiring increased data line thickness, thereby preventing substrate warping and associated faults such as stains.
3Reliability
If the width of the data line is increased to decrease resistance, then the resistance is decreased, but the aperture ratio of the display is reduced
Solution Approach 1:
The floating electrode extends in the second direction (transverse direction) across the display area, providing an additional conduction path that is perpendicular to the data line direction. This allows resistance to be decreased by utilizing the transverse direction for current flow, without increasing the width of the data line in the first direction, thus maintaining the aperture ratio while improving electrical performance.
Data Source
AI summary
A display substrate includes a gate line extending in a first direction, a floating electrode disposed on the same layer as the gate line, and a data line. Opposite ends of the floating electrode are electrically connected with the data line. The floating electrode extends in a second direction that crosses the first direction. The data line includes a recess disposed adjacent to the gate line. The data line overlaps with the floating electrode and also extends in the second direction.