Modulation Device Scan Line Width Variation for RC Loading Reduction
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Solution Overview
Problem
The complexity of circuit layouts in large-scale modulation devices leads to increased resistance-capacitance (RC) loading, affecting signal transmission quality and reliability.
Innovation Solution
The modulation device incorporates a substrate with a modulation unit, data line, and scan line, where the scan line has different widths in overlapping and non-overlapping areas, and an insulating layer with low permittivity is used to reduce capacitance loading, along with a heat dissipation structure to minimize impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the scan line has a uniform width, then the manufacturing process is simple, but the capacitance loading is high in overlapping areas
Solution Approach 1:
The scan line is designed with different widths in different regions: a first width in the overlapping area with the data line and a second width in the non-overlapping area. This local variation reduces capacitance loading where it matters most (in the overlapping region) while maintaining adequate signal transmission in non-overlapping regions, thereby resolving the contradiction between manufacturing simplicity and signal quality.
2Area of stationary object
If the overlapping area between scan line and data line is large, then the circuit layout is compact, but the resistance-capacitance loading increases
Solution Approach 1:
The scan line width is locally adjusted to be narrower in the overlapping area with the data line, reducing the capacitance loading in this critical region. This allows the device to maintain a compact overall area while minimizing RC loading effects in the overlapping region, thus resolving the contradiction between compactness and signal quality.
Data Source
Figure 1A
Figure 1B
Figure 1C~1D
AI summary
A modulation device including a substrate, a modulation unit, a data line, and a scan line is provided. The modulation unit is disposed on the substrate. The data line is disposed on the substrate and is electrically connected to the modulation unit. The scan line is disposed on the substrate, and has an overlapping area overlapping the data line and a non-overlapping area not overlapping the data line. In a first direction, the scan line has a first width in the overlapping area, and the scan line has a second width in the non-overlapping area. The first width is smaller than the second width. The modulation device of the disclosure reduces a resistance-capacitance loading.