Array Substrate Lead Impedance Equalization
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Solution Overview
Problem
Existing liquid crystal display panels face challenges in achieving uniform impedance across different leads and data lines, leading to variations in signal transmission efficiency, which affects the display's overall performance and light pass control.
Innovation Solution
The array substrate design includes a first lead with a larger length and a contacting area, coupled with a driver and insulating layers, to equalize impedance by increasing the number and size of through holes, ensuring consistent signal transmission across all data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If leads of different lengths are used to connect driver to data lines, then the display can accommodate different data line positions, but the impedance varies across leads affecting signal transmission uniformity
Solution Approach 1:
The patent applies local quality by creating different contacting areas at different locations. Specifically, leads with longer lengths (first leads) are provided with larger contacting areas at their intersections with data lines, while leads with shorter lengths (second leads) have smaller contacting areas. This local variation in contacting area compensates for the different lead lengths, ensuring that the total impedance remains substantially equal across all leads despite their different configurations.
2Area of stationary object
If lead lengths are varied to reach different data lines, then connection coverage is improved, but signal transmission efficiency varies across different leads
Solution Approach 1:
The patent varies the contacting area locally based on lead length. First leads that extend farther to reach distant data lines are provided with larger contacting areas at their intersections, while second leads that reach nearer data lines have smaller contacting areas. This local adjustment ensures that the impedance contribution from each lead-contacting area combination is balanced, maintaining uniform signal transmission efficiency across all leads despite their different coverage areas.
3Productivity
If contacting areas are made larger to reduce impedance, then signal transmission improves, but the structure becomes more complex
Solution Approach 1:
The patent implements a simplified version of variable contacting area by providing larger contacting areas only at specific locations where first leads (longer leads) intersect with data lines, while second leads (shorter leads) have smaller contacting areas. This localized differentiation achieves impedance balance and uniform signal transmission without requiring complex variable geometry throughout the entire lead structure, thus improving signal transmission efficiency while limiting the increase in device complexity.
Data Source
AI summary
An array substrate can include a plurality of thin film transistors, a plurality of function lines, a plurality of leads, a coupling part and a driver. The plurality of function lines are configured to transmit driving signals to the thin film transistors. The plurality of leads include a first lead and a second lead. The coupling part is electrically coupling the leads to the function lines. The driver is electrically coupled to the leads, and configured to provide the driving signals to the function lines. The first lead has a length larger than that of the second lead. A contacting area between the first lead and the coupling part is larger than that between the second lead and the coupling part. A display panel with the array substrate is also provided.