Display Substrate Connecting Lines Detour Routing for EMI Suppression
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Solution Overview
Problem
In display devices, the compact arrangement of circuits and wirings leads to electromagnetic interference, affecting the display quality due to the generation of spikes in selection signals at high frequencies.
Innovation Solution
The display substrate incorporates a detour routing for connecting lines with a longer length and overlapping orthographic projections with power buses and signal lines, increasing resistance and capacitance to slow down signal transitions and suppress electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If circuits and wirings are arranged in a limited space to meet thin and light requirements, then device thickness and weight are reduced, but electromagnetic interference increases affecting display quality
Solution Approach 1:
The patent introduces connecting lines as intermediary elements between control lines and pads. These connecting lines act as mediators that intentionally increase in length to add parasitic inductance and resistance, which smooth out high-frequency spikes in selection signals. The connecting lines serve as a buffer zone that transforms the harmful electromagnetic interference into a more stable signal, resolving the contradiction between compact wiring and electromagnetic interference reduction.
Solution Approach 2:
The patent deliberately changes the physical parameters of the connecting lines by increasing their length beyond the minimum required distance. This parameter change increases the parasitic inductance and resistance, which naturally filters high-frequency noise and spikes in the selection signals. By adjusting the length parameter, the system transforms electromagnetic interference into a beneficial filtering effect that improves display quality while maintaining the compact form factor.
2Speed
If connecting lines are made shorter to reduce electromagnetic interference, then signal transmission speed increases, but electromagnetic interference from high-frequency spikes worsens
Solution Approach 1:
The patent converts the harmful high-frequency spikes into a beneficial filtering effect by intentionally increasing the connecting line length. The parasitic inductance and resistance of the longer connecting lines act as a low-pass filter, smoothing out the high-frequency noise while allowing the essential signal to pass through. This transforms what would normally be a harmful electromagnetic interference into a useful signal conditioning mechanism that improves overall system performance.
3Device complexity
If multiplex switches are used to control data line leads, then wiring complexity is reduced, but selection signal spikes increase due to high-frequency switching
Solution Approach 1:
The connecting lines serve as intermediary elements between the multiplex switches and the pads. These intermediaries provide a natural filtering effect that smooths the high-frequency switching spikes generated by the multiplex switches. The parasitic inductance and resistance of the connecting lines act as a buffer, reducing the amplitude of voltage spikes while maintaining the switching functionality, thus resolving the contradiction between simplified wiring and signal quality.
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 effectively reduces electromagnetic interference by smoothing selection signal waveforms, improving display quality and reducing electromagnetic interference.
Implementation Method 1
increasing resistance and capacitance to slow down signal transitions
Implementation Method 2
increasing resistance and capacitance to slow down signal transitions
Implementation Method 3
overlapping orthographic projections with power buses and signal lines
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes: a base substrate; a plurality of first data line leads; a plurality of multiplex switches and at least two control lines electrically coupled to the plurality of multiplex switches; a plurality of second data line leads; a plurality of first pads and a plurality of second pads; and at least two connecting lines coupled to the at least two control lines and at least two of the plurality of second pads; wherein a length of any of the at least two connecting lines is longer than a vertical distance from any of the at least two second pads to a control line coupled to any of the at least two connecting lines.