Display Device Circuit Board Ground Line Shielding
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Solution Overview
Problem
In display devices, signal lines on circuit boards can experience mutual interference due to parasitic capacitors, which affects the accuracy of touch input detection and signal transmission between data and touch lines.
Innovation Solution
The implementation of a circuit board design with a first and second conductive layer separated by an insulating layer, where vias connect these layers to reduce parasitic capacitance, and the use of ground lines and vias to minimize signal interference between data and touch lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines are disposed on the circuit board with two or more layers, then the signal transmission capability is improved, but mutual interference occurs due to parasitic capacitor between the signal lines
Solution Approach 1:
A ground line is introduced as an intermediary element between data lines and touch lines on the circuit board. This ground line acts as a mediator that shields the signal lines from each other, reducing the parasitic capacitance coupling between adjacent signal lines and minimizing mutual interference while maintaining multi-layer signal transmission capability
2Object-affected harmful factors
If ground lines are added to reduce parasitic capacitance, then signal interference is reduced, but the circuit board complexity increases
Solution Approach 1:
The ground line is merged with the existing circuit board trace structure, using the same conductive material and fabrication process as other signal lines. This integration approach reduces the added complexity by treating the ground line as just another trace layer rather than a separate component, while still providing effective shielding against 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 reduces signal interference and improves the accuracy of touch input detection by minimizing the impact of parasitic capacitance, enhancing the reliability of touch input coordinates and signal transmission.
Implementation Method 1
mutual interference may occur due to a parasitic capacitor between the signal lines
Implementation Method 2
a first ground line disposed between at least two or more of the plurality of data lines and the plurality of touch lines
Data Source
AI summary
A display device includes: a panel including a display region and a touch region; and a circuit board, and including a first conductive layer, a second conductive layer and a first insulating layer between the first conductive layer and the second conductive layer. The circuit board includes: a plurality of data lines electrically connected with a plurality of data signal lines; a plurality of touch lines electrically connected with a plurality of touch electrodes; and a first ground line disposed between at least two or more of the plurality of data lines and the plurality of touch lines. The first ground line includes a first part of the first conductive layer, a first part of the second conductive layer, and a first via passing through the first insulating layer and connecting the first part of the first conductive layer with the first part of the second conductive layer.