Display Panel Shielding Grid for Active-Pen Touch Noise Control
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Solution Overview
Problem
Existing OLED display panels face issues with high noise levels in touch signals due to the proximity of the display substrate and touch layer group, particularly when using active pens, leading to interference and inconsistent noise intensity across the panel.
Innovation Solution
The display panel incorporates a shielding layer with wider shielding connection wires than touch connection wires, grounded or connected to a constant voltage terminal, and a noise reduction layer with a signal generator providing an opposite signal to the data signal, along with a structured layout of connection wires to equalize resistance and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is added between the display substrate and touch layer group, then noise interference in touch signals is reduced, but device complexity increases
Solution Approach 1:
A shielding layer comprising a shielding body part and shielding connection wires is introduced as an intermediary component between the display substrate and touch layer group. The shielding body part is connected to ground or constant voltage terminal through shielding connection wires, creating an electromagnetic shield that blocks noise from affecting touch signals without requiring fundamental redesign of the display structure.
Solution Approach 2:
The shielding layer is segmented into distinct functional parts: a shielding body part that provides the actual shielding function, and shielding connection wires that provide electrical connection to ground or constant voltage terminal. This segmentation allows the shielding function to be integrated into the existing display structure without requiring complete structural overhaul.
2Object-affected harmful factors
If shielding connection wires are made wider than touch connection wires, then noise shielding effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different wire widths are applied to different functional components: shielding connection wires are made wider than touch connection wires. The wider shielding connection wires provide lower resistance and better noise shielding effectiveness, while the narrower touch connection wires maintain sufficient signal quality for touch operations. This local differentiation of wire dimensions optimizes each component's performance for its specific function.
3Object-affected harmful factors
If multiple shielding connection wires are used with equal resistance, then noise interference is reduced, but device complexity increases
Solution Approach 1:
Multiple shielding connection wires are used to connect the shielding body part to ground or constant voltage terminal, with each wire designed to have substantially equal resistance. This equipotential design ensures uniform noise shielding across different regions of the display panel, preventing potential differences that could generate additional noise or affect touch signal quality.
4Object-affected harmful factors
If the shielding layer is positioned between the first electrode and touch layer group, then touch signal noise is reduced, but display area is reduced
Solution Approach 1:
The shielding layer is positioned in the vertical dimension between the first electrode and touch layer group, rather than expanding horizontally into the display area. By utilizing the vertical space between existing layers, the shielding function is added without reducing the horizontal display area, maintaining both noise reduction performance and display size.
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
The solution effectively reduces noise interference in touch signals, ensuring consistent signal quality and performance across the display panel, particularly at binding areas, enhancing the touch functionality and display quality.
Implementation Method 1
a shielding layer arranged between the first electrode and the touch layer group, wherein the shielding layer includes a shielding body part and a shielding connection wire
Implementation Method 2
a width of the shielding connection wire is greater than a width of the touch connection wire
Implementation Method 3
resistances of the at least two shielding connection wires are substantially the same
Implementation Method 4
grounded or connected to a constant voltage terminal
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a display substrate, a touch layer group, and a shielding layer. The display substrate includes a first electrode. The touch layer group is arranged on a light output side of the display substrate. The touch layer group includes a touch body part and a touch connection wire. The touch connection wire is connected to the touch body part. The shielding layer is arranged between the first electrode and the touch layer group. The shielding layer includes a shielding body part and a shielding connection wire. The shielding body part includes multiple first metal wires interwoven to form multiple first grids, and subpixels of the display substrate are located within orthographic projections of the first grids on the display substrate.