Capacitive Conductor Pattern for Display Noise Suppression
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Solution Overview
Problem
Display devices with wireless communication functions experience noise interference from electromagnetic waves generated during signal switching operations, which can disrupt wireless communication signals.
Innovation Solution
A display device design that includes a conductor pattern capacitively coupled to video signal wirings in the peripheral wiring region to suppress noise interference, with the conductor pattern overlapping parts of the video signal wirings and receiving a common potential to decouple noise currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video signal wirings are arranged in the peripheral wiring region to connect the signal selection circuit, then the display function can be implemented, but electromagnetic waves generated during switching operations interfere with wireless communication signals
Solution Approach 1:
A conductor pattern is introduced as an intermediary element between the video signal wiring and the wireless communication signal. This conductor pattern acts as a mediator that captures and redirects electromagnetic energy through capacitive coupling, preventing the harmful electromagnetic waves from interfering with wireless communication while allowing the video signal wiring to function normally.
Solution Approach 2:
The electromagnetic waves generated by the video signal wiring during switching operations, which were previously harmful interference, are converted into a beneficial effect. By introducing the conductor pattern that is capacitively coupled to the video signal wiring, the electromagnetic energy is redirected to shield the wireless communication region, transforming the noise source into a protective element.
2Reliability
If a shield layer is arranged above the sensor feed line to suppress noise, then touch sensing noise is reduced, but the device structure becomes more complex
Solution Approach 1:
The conductor pattern is designed to serve multiple functions simultaneously: it acts as a shield for wireless communication signals, provides capacitive coupling to reduce noise in video signal wirings, and can also serve as part of the overall wiring structure. This multi-functionality reduces the need for separate dedicated shield layers, thereby simplifying the overall device structure while maintaining noise suppression effectiveness.
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
Effectively reduces noise components in the video signal wirings, minimizing interference with wireless communication signals and improving the overall performance of the display device.
Implementation Method 1
a conductor pattern capacitively coupled to a plurality of video signal wirings VSW
Implementation Method 2
electromagnetic waves generated with the switching operation for inputting signals for a display function interfere with the band of the wireless communication
Data Source
AI summary
A peripheral wiring region of a display device includes a first insulating layer on a substrate, a first wiring layer on the first insulating layer, a second insulating layer which is present on the first insulating layer and covers the first wiring layer, and a second wiring layer on the second insulating layer. A plurality of video signal wirings are arranged in the first wiring layer. A plurality of touch detection wirings arranged in a matrix in an X direction and a Y direction and a conductor pattern to which a fixed potential is supplied are formed in the second wiring layer. The conductor pattern is arranged at a position overlapping a part of the plurality of video signal wirings and is capacitively coupled to the part of the plurality of video signal wirings.