Display Signal Lines Reducing Electromagnetic Interference
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Solution Overview
Problem
Display devices generate electromagnetic interference due to magnetic fields from signal lines, leading to signal noise and operational errors, particularly in vehicles where electronic devices are closely packed, causing performance degradation and safety risks.
Innovation Solution
The display device incorporates signal lines with a partially opened loop shape, featuring first, second, and third portions that extend in parallel, with opposing current directions to cancel magnetic fields externally, reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines are arranged in parallel to transmit signals, then signal transmission efficiency is improved, but electromagnetic interference is generated between adjacent signal lines
Solution Approach 1:
The patent applies differential signaling where two signal lines carry equal-magnitude currents in opposite directions. The magnetic fields generated by these opposing currents cancel each other externally, converting the harmful electromagnetic interference into a beneficial cancellation effect. This allows parallel signal transmission while eliminating external magnetic field interference.
Solution Approach 2:
The patent changes the current direction parameter in adjacent signal lines from unidirectional to bidirectional (opposite directions). By controlling the current parameters to flow in opposite directions with equal magnitude, the magnetic field parameters externally cancel out, reducing electromagnetic interference while maintaining signal transmission capability.
2Area of stationary object
If multiple electronic devices are closely packed in vehicles, then space utilization is improved, but electromagnetic interference causes signal noise and operational errors
Solution Approach 1:
The patent converts the harmful electromagnetic interference problem into a beneficial solution by using differential signaling. The opposing currents in adjacent signal lines generate magnetic fields that cancel each other externally, allowing close packing of electronic devices in vehicles while maintaining signal quality and preventing operational errors.
3Device complexity
If conventional parallel signal lines are used, then device complexity is reduced, but magnetic field cancellation is not achieved leading to electromagnetic interference
Solution Approach 1:
The patent modifies the current direction parameter in adjacent signal lines to flow in opposite directions. This parameter change enables magnetic field cancellation externally while maintaining the simplicity of parallel signal line configuration. The opposing currents generate magnetic fields that cancel each other, reducing electromagnetic interference without significantly increasing device complexity.
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 effectively reduces electromagnetic interference between the display device and other electronic devices, minimizing signal noise and operational errors, and enhancing safety by reducing electromagnetic interference in vehicles.
Implementation Method 1
a magnetic field may be generated inside or outside the display device by the signal applied to the wiring line
Implementation Method 2
cancelling the magnetic field generated in each sub wiring line at the outside of the signal line
Data Source
AI summary
Provided is a display device. The display device includes a substrate including an active area in which a plurality of pixels is disposed and a non-active outside a periphery of the active area. A plurality of signal lines is disposed in parallel with one another and extend in a first direction in the non-active area. Each of the plurality of signal lines includes a first portion, a second portion, and a third portion which are sequentially connected to one another. The first and third portions extend in the first direction and are disposed in parallel with one another. Embodiments provided herein facilitate a reduction of electromagnetic interference between the display device and an external electronic device.