Shielding Parts Reduce Crosstalk in OLED Display Panels
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Solution Overview
Problem
In OLED display panels, signal crosstalk occurs between driving signal lines and touch traces due to the proximity of these components, leading to abnormal touch control.
Innovation Solution
The display panel design includes a wiring area with a first and second conductive layer, where the second conductive layer incorporates shielding parts connected to transmission parts, overlapping with the driving signal lines to reduce signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch traces and driving signal lines are disposed in close proximity in OLED display panels, then the touch screen functionality is integrated, but signal crosstalk occurs between driving signal lines and touch traces leading to abnormal touch control
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the driving signal lines and touch traces. This shielding layer acts as a mediator that blocks electromagnetic interference from the driving signal lines, preventing crosstalk while allowing both the touch traces and driving signal lines to maintain their close proximity for integrated functionality.
Solution Approach 2:
The shielding function is extracted as a separate, dedicated layer (shielding layer) that is disposed between the first conductive layer (driving signal lines) and the third conductive layer (touch traces). This extracted shielding function effectively isolates the two signal paths without requiring physical separation of the layers.
2Device complexity
If multiple conductive layers with driving signal lines and touch traces are stacked in close proximity, then device integration is improved, but signal interference and crosstalk increase
Solution Approach 1:
The shielding layer serves as an intermediary barrier within the multi-layer conductive structure. It is strategically positioned between the driving signal lines (first conductive layer) and touch traces (third conductive layer) to block electromagnetic interference while maintaining the compact multi-layer integration.
Solution Approach 2:
The shielding layer is selectively disposed only in regions where driving signal lines and touch traces are in close proximity and crosstalk is most likely to occur. This localized shielding approach addresses signal interference problems in critical areas without adding unnecessary complexity to the entire device structure.
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 signal crosstalk between driving signal lines and touch traces, enhancing the touch effect and reliability of the display panel.
Implementation Method 1
The second conductive layer further includes one or more shielding parts disposed in the first wiring area. The one or more shielding parts are connected to the transmission parts. An orthographic projection of the one or more shielding parts on the substrate overlaps at least partially an orthographic projection of the driving signal lines on the substrate.
Data Source
AI summary
A display panel and a display device are provided by the present disclosure. A first conductive layer includes a plurality of driving signal lines in the first wiring area. The driving signal lines are configured to load alternating current signals. A second conductive layer includes one or more shielding parts disposed in the first wiring area. A third conductive layer includes a plurality of touch traces, and the touch traces extend from the display area into at least the first wiring area. An orthographic projection of the one or more shielding parts on the substrate overlaps at least partially an orthographic projection of the driving signal lines on the substrate.