Overlapping Power Supply and Ground Lines in Display Devices
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Solution Overview
Problem
High-resolution display panels generate increased heat and radiation noise due to longer wiring lengths, which conventional techniques struggle to adequately address without enlarging the frame region.
Innovation Solution
The display device incorporates overlapping power supply and ground lines with an insulator in between, along with specific layering and lamination configurations, to reduce radiation noise and heat generation without expanding the frame region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display panel resolution is increased, then the display quality is improved, but the wiring length increases and heat generation increases
Solution Approach 1:
The patent applies dimensional change by transitioning from a planar wiring layout to a three-dimensional stacked configuration. Power supply lines and ground lines are arranged in different layers vertically, allowing them to overlap in the planar view while being separated by insulators in the vertical dimension. This reduces the horizontal wiring length and associated heat generation while maintaining the required electrical connections for high-resolution displays.
2Measurement precision
If the display panel resolution is increased, then the display quality is improved, but the radiation noise from power supply line increases
Solution Approach 1:
The patent introduces insulators as intermediary elements between power supply lines and ground lines. These insulators are positioned in the vertical dimension to electrically isolate the power supply lines from ground lines while allowing them to overlap in the planar view. This configuration reduces radiation noise by preventing electromagnetic coupling between adjacent power and ground lines, thereby maintaining signal integrity in high-resolution displays.
3Reliability
If the frame region is enlarged, then the wiring region can be expanded to reduce wiring resistance, but the display area is reduced
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension through multi-layer stacking. Power supply lines and ground lines are configured in different layers that overlap in the planar view, effectively increasing the wiring cross-sectional area and reducing resistance without expanding the horizontal frame region. This allows the display area to be maximized while maintaining reliable electrical connections.
4Adaptability or versatility
If the wiring pattern is elongated to accommodate narrowed frame, then the wiring resistance increases and radiation noise increases
Solution Approach 1:
The patent addresses the elongated wiring issue by implementing a three-dimensional wiring architecture where power supply lines and ground lines are stacked in vertical layers. This configuration effectively shortens the current path by allowing parallel conduction through multiple layers, thereby reducing wiring resistance and radiation noise while maintaining the narrowed frame configuration for compact display designs.
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 radiation noise from the power supply line while suppressing heat generation in the source driver, maintaining a compact frame size.
Implementation Method 1
At least parts of the power supply line and the ground line overlap each other in planar view with an insulator interposed therebetween
Implementation Method 2
at least parts of the power supply line, the first ground line, and the second ground line may overlap one another in planar view with an insulator interposed therebetween
Data Source
AI summary
A display device includes a display panel that displays an image, a drive circuit that outputs a drive signal to the display panel, a power supply line that is formed in the display panel to supply a power supply voltage to the drive circuit, and a ground line that is formed in the display panel to supply a ground potential to the drive circuit. At least parts of the power supply line and the ground line overlap each other in planar view with an insulator interposed therebetween.