Fanout Wiring Structure Equalizing Resistance in LCD Panels
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Solution Overview
Problem
Conventional fanout wiring structures in large-sized LCD panels exhibit significant resistance differences between the first and last fanout wires, leading to color deviation and mura effects due to increased RC delay, which cannot be adequately addressed by using metals with lower electric resistivity.
Innovation Solution
A fanout wiring structure comprising a substrate with first and second conductive wire regions of different electric resistivities, where the second end point of each first conductive wire is electrically connected to the third end point of each second conductive wire, forming either a collinear or parallel structure to equalize resistance, thereby reducing the resistance difference between adjacent fanout wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal with lower electric resistivity is used in the fanout wiring structure, then the electric resistivity of the wiring is reduced, but the resistance difference between side portions and central portion remains significant, causing color deviation and mura effect
Solution Approach 1:
The patent applies local quality by using different electric resistivity materials in different regions of the fanout wiring structure. Specifically, the central portion uses a first conductive material with first electric resistivity, while the side portions use a second conductive material with second electric resistivity. This local differentiation compensates for the natural resistance gradient, equalizing the total resistance across all fanout wires and eliminating color deviation and mura effects.
Solution Approach 2:
The patent changes the electrical parameter (electric resistivity) of the conductive materials based on position within the fanout wiring structure. By selecting materials with different resistivity values for different regions, the patent adjusts the resistance distribution to achieve uniformity across the display panel, directly addressing the color deviation and mura effect problems.
2Area of stationary object
If the display panel size is increased, then the display area is enlarged, but the resistance difference between first and last fanout wires increases significantly, worsening RC delay and display uniformity
Solution Approach 1:
For large-sized display panels, the patent implements local quality by assigning different electric resistivity materials to different spatial regions. The central fanout wires use one material while side fanout wires use another material with different resistivity, creating a compensated resistance distribution that maintains display uniformity even as the overall panel size increases.
Solution Approach 2:
The patent addresses large panel resistance issues by changing the electrical parameters of the conductive materials based on position. By selecting materials with appropriately different resistivity values for central versus side regions, the patent compensates for the increased resistance differences that naturally occur in larger panels, maintaining consistent RC delay characteristics across all fanout wires.
Data Source
AI summary
A fanout wiring structure and LCD panel using the same are described. The fanout wiring structure comprises a substrate; a first wire region comprising first conductive wires with a first electric resistivity wherein each first conductive wire comprises a first end point and a second end point, and the first end point is electrically connected to the signal transmission interface; and a second wire region comprising second conductive wires with second electric resistivity wherein each second conductive wire comprises third end point and fourth end point, and the fourth end point is electrically connected to the signal receiving interface; wherein the second end point is electrically and correspondingly connected to the third end point, and each first conductive wire and each second conductive wire form either a collinear structure or a parallel connection structure to construct the fanout wiring structure for equalizing a resistance of each fanout wiring structure.