Display Panel Shielding Wires for Uniform Active Pen Touch Signals
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Solution Overview
Problem
Existing OLED display panels face issues with high noise levels in touch signals, particularly when using active pens, due to the proximity of the display substrate and touch layer, leading to interference and varying noise intensities 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 a signal opposite to the data signal to reduce noise interference, along with a structured layout of connection wires to equalize resistances and minimize noise.
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 is introduced as an intermediary component between the display substrate and touch layer group. This shielding layer includes a shielding body part and a shielding connection wire connected to a constant voltage terminal, creating an equipotential shielding effect that blocks electromagnetic interference from the display substrate (including data line signals and pixel electrode voltage changes) from reaching the touch electrodes, thereby reducing noise in touch signals without requiring fundamental changes to the existing display or touch layer structures
Solution Approach 2:
The shielding layer is connected to a constant voltage terminal through the shielding connection wire, establishing an equipotential reference plane between the display substrate and touch layer group. By maintaining a stable voltage potential at the shielding layer, voltage differences and electromagnetic coupling between adjacent layers are minimized, reducing noise interference while the wider shielding connection wire ensures sufficient current capacity and stable potential distribution
2Object-affected harmful factors
If the shielding connection wire is made wider than the touch connection wire, then noise shielding effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different wire widths are applied to different functional components: the shielding connection wire is made wider than the touch connection wire to provide superior noise shielding performance, while the touch connection wire maintains its original width optimized for touch signal transmission. This local differentiation allows each component to have the optimal dimensions for its specific function without compromising overall manufacturing feasibility
Solution Approach 2:
The width parameter of the shielding connection wire is increased relative to the touch connection wire to enhance shielding effectiveness. This parameter change improves the current-carrying capacity and reduces resistance of the shielding connection path, ensuring stable voltage potential at the shielding layer while the design accounts for standard manufacturing tolerances to maintain production precision
3Object-affected harmful factors
If multiple shielding connection wires are used with equal resistance, then noise reduction consistency is improved, but device complexity increases
Solution Approach 1:
Multiple shielding connection wires are used to connect the shielding body part to the constant voltage terminal, with each wire designed to have substantially equal resistance. This ensures that the shielding layer maintains a uniform equipotential reference across the entire display panel, preventing potential differences that could cause noise or interference, while the symmetry in resistance values simplifies the electrical characteristics of the shielding network
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 across the panel and enhancing the touch functionality, particularly with active pens, by utilizing a shielding layer and noise reduction mechanisms.
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
a noise reduction layer with a signal generator providing a signal opposite to the data signal to reduce noise interference
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 connection wire is connected to the shielding body part. A width of the shielding connection wire is greater than a width of the touch connection wire.