Circuit Board Signal Line Capacitance Management
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Solution Overview
Problem
The length of signal lines in circuit boards of display devices can lead to deterioration in signal transmission characteristics, affecting display quality.
Innovation Solution
The implementation of a circuit board design that includes signal lines with overlapping metallic and conductive layers, capacitors, and insulation layers to manage parasitic capacitance and improve signal transmission by adjusting capacitance between the signal lines and conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the length of signal lines in the circuit board is increased, then the area for mounting components and routing signals is improved, but the signal transmission characteristics deteriorate
Solution Approach 1:
The patent converts the harmful parasitic capacitance between signal lines and conductive layers into a beneficial component by deliberately designing capacitors with specific capacitance values. These capacitors are strategically placed near signal lines to compensate for signal degradation, transforming the previously harmful capacitive coupling effect into a useful signal restoration mechanism that improves transmission characteristics over long distances
Solution Approach 2:
The patent changes the capacitance parameter by introducing adjustable capacitors with specific capacitance values (e.g., 0.5pF to 5pF) between signal lines and conductive layers. By controlling and optimizing the capacitance value, the patent achieves improved signal transmission characteristics while maintaining the extended circuit board area, thus resolving the contradiction between board size and signal quality
2Reliability
If the capacitance between signal line and conductive layer is increased, then the signal transmission characteristics are improved, but the parasitic capacitance increases
Solution Approach 1:
The patent converts the harmful parasitic capacitance into a beneficial component by deliberately designing capacitors with specific capacitance values. These capacitors are strategically placed near signal lines to compensate for signal degradation, transforming the previously harmful capacitive coupling effect into a useful signal restoration mechanism
Solution Approach 2:
The patent optimizes the capacitance parameter by selecting specific capacitance values (e.g., 0.5pF to 5pF) that improve signal transmission without causing excessive parasitic effects. This parameter optimization allows the system to achieve better signal integrity while controlling the harmful parasitic capacitance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances signal transmission characteristics, preventing deterioration even with increased signal line length and maintaining display quality.
Implementation Method 1
a first capacitor including a first terminal electrically coupled to the first metallic layer and a second terminal electrically coupled to the first conductive layer
Data Source
AI summary
A circuit board for a display device includes: a signal line to transmit signal, a first metallic layer overlapping the signal line, a first conductive layer spaced apart from the first metallic layer, a base layer insulating the signal line from the first metallic layer and from the first conductive layer, and a first capacitor including a first terminal electrically coupled to the first metallic layer and a second terminal electrically coupled to the first conductive layer.