Active Matrix Signal Line Layout for Uniform Display Resistance
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Solution Overview
Problem
Conventional active matrix substrates face issues with increased resistance changes in adjacent video signal lines due to the use of two conductive layers with different sheet resistances, leading to display unevenness.
Innovation Solution
The active matrix substrate is designed with signal lines that include first and second line portions made of different conductive layers, with the position of connection portions determined to equalize the length of these portions, minimizing resistance differences between adjacent lines, and arranged in specific groups to facilitate parallel layout and reduce unnecessary space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If video signal lines are composed of two different conductive layers with different sheet resistances to route lines at narrower pitch, then the line pitch is reduced and frame size is minimized, but the resistance change between adjacent video signal lines increases causing display unevenness
Solution Approach 1:
The patent applies local quality by making adjacent video signal lines have different conductive layer configurations at different positions. Specifically, odd-numbered lines use the first conductive layer while even-numbered lines use the second conductive layer, creating local variations that balance the overall resistance characteristics across all lines and reduce display unevenness
Solution Approach 2:
The patent changes the electrical parameters of the video signal lines by utilizing two different conductive layers with different sheet resistances. By strategically assigning which conductive layer each line uses, the patent optimizes the resistance characteristics to minimize display unevenness while maintaining narrow line pitch
2Area of stationary object
If video signal lines are routed to converge in a fan shape with narrower line pitch toward the terminal region, then the terminal region size is reduced and cost is lowered, but the resistance change between adjacent lines increases
Solution Approach 1:
The patent applies local quality by varying the conductive layer assignment based on the line's position in the fan-shaped routing. Lines at different angular positions and distances from the matrix region are assigned different conductive layers, creating local compensations that balance the resistance changes caused by the converging geometry
Solution Approach 2:
The patent introduces asymmetry in the conductive layer assignment pattern to counterbalance the asymmetric fan-shaped routing. By strategically assigning conductive layers to specific lines based on their position, the patent creates an asymmetric compensation scheme that reduces resistance variation despite the symmetric-looking fan shape
Data Source
AI summary
An active matrix substrate includes a plurality of signal lines, each of which includes first and second line portions and an inner connection portion (connection portion) that connects the first and second line portions. The first and second line portions of one of two adjacent signal lines are made of first and second conductive layers, respectively, and the first and second line portions of the other of the two adjacent signal lines are made of second and first conductive layers, respectively. The position of the connection portion of each of the signal lines is determined in accordance with the layout position of that signal line in the line region.