Display Panel Grounding Traces Shield Electromagnetic Interference
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Solution Overview
Problem
Display panels in electronic devices face signal fluctuations and performance reduction due to electromagnetic interference from external devices, particularly affecting high-speed signal traces and power traces.
Innovation Solution
The use of grounding traces adjacent to power traces forms a loop, acting as a shield against electromagnetic interference, with varying trace widths and configurations to effectively cancel or reduce interference effects between different types of signal traces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If high-speed signal traces and power traces are placed adjacent to each other for compact layout, then the frame width of the display panel is reduced, but electromagnetic interference causes signal fluctuations and performance degradation
Solution Approach 1:
A ground trace is introduced as an intermediary element between the power trace and high-speed signal trace. This ground trace acts as a shield that redirects electromagnetic interference, preventing it from coupling between the power trace and signal trace while maintaining compact spacing for reduced frame width.
Solution Approach 2:
The ground trace configuration converts the harmful electromagnetic interference into a beneficial shielding effect. By placing the ground trace adjacent to both the power trace and signal trace, the electromagnetic fields are redirected toward the ground trace, which dissipates the interference energy harmlessly, thereby protecting the signal integrity.
2Reliability
If multiple grounding traces with different widths are used to shield against electromagnetic interference, then signal integrity is improved, but the trace configuration complexity increases
Solution Approach 1:
Different sections of the ground trace are assigned different widths based on local interference conditions. The first ground trace has a first width and the second ground trace has a second width, optimized for their respective positions adjacent to different signal traces. This local optimization provides effective shielding while avoiding uniform complexity throughout the entire trace configuration.
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 configuration enhances the display performance by minimizing signal distortions and improving the overall display effect, while also potentially reducing the frame width of the display panel.
Implementation Method 1
The use of grounding traces adjacent to power traces forms a loop, acting as a shield against electromagnetic interference
Data Source
AI summary
A display panel with display and non-display regions has pixel units in the display region. The non-display region defines a bonding region in which there are traces and driving chips. The driving chips are bonded in a flexible printed circuit, and electrically connect with the pixel units. The traces include high-speed signal traces, power traces, and grounding traces. The grounding traces are adjacent to the power traces and so disposed as to shield against electromagnetic interference affecting the signal and power traces, the grounding traces serving as reference ground to the power traces, and form a shield against electromagnetic interference.