OLED Touch Panel Dual Metal Mesh Noise Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible OLED touch panels, particularly FMLOC, suffer from low signal-to-noise ratio and excessive RC loading due to the close proximity of touch electrodes to the OLED, leading to noise interference and impaired touch performance.
Innovation Solution
The implementation of a touch panel layer with a first metal mesh layer, a second metal mesh layer, and a bridge metal layer, where the second metal mesh layer is insulated from the bridge metal layer and connected to the first metal mesh layer through a via, and both metal mesh layers have the same mesh density, effectively shielding noise and reducing loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch electrode is directly evaporated on the encapsulation layer surface to reduce distance, then the signal strength is improved, but the crosstalk and noise increase significantly
Solution Approach 1:
The patent divides the touch electrode into two separate metal mesh layers (first and second metal mesh layers) positioned at different heights above the OLED. This segmentation allows each layer to contribute to signal detection while reducing crosstalk, as the insulation layer between them electrically isolates the two meshes while maintaining capacitive coupling for touch sensing.
Solution Approach 2:
The patent introduces a vertical dimension by stacking two metal mesh layers at different heights (separated by an insulation layer), transforming the traditional single-plane electrode into a three-dimensional structure. This dimensional change enables simultaneous signal detection and noise reduction by utilizing both layers' capacitive coupling with the OLED.
2Measurement precision
If the distance between touch electrode and OLED is shortened, then the signal reception is improved, but the parasitic capacitance and RC loading increase excessively
Solution Approach 1:
By segmenting the touch electrode into two mesh layers separated by an insulation layer, the patent distributes the capacitive coupling across two interfaces rather than one. This reduces the parasitic capacitance at each interface while maintaining overall signal reception, thereby decreasing RC loading and charging time.
Solution Approach 2:
The insulation layer acts as an intermediary between the two metal mesh layers and the OLED, enabling capacitive coupling while providing electrical isolation. This intermediary structure reduces direct parasitic capacitance formation between the touch electrode and OLED, lowering RC loading effects.
3Device complexity
If a single metal mesh layer is used for touch sensing, then the structure is simple, but the signal-to-noise ratio is low due to direct contact with OLED
Solution Approach 1:
The patent segments the touch electrode into two metal mesh layers with an insulation layer between them. This segmentation improves the signal-to-noise ratio by reducing direct crosstalk with the OLED while maintaining capacitive coupling for touch sensing, with the bridge metal layer providing additional electrical connection functionality.
Solution Approach 2:
The patent implements a nested structure where the first and second metal mesh layers are stacked vertically with the insulation layer in between, creating a layered configuration. The bridge metal layer connects these nested layers through vias, forming a compact three-dimensional structure that improves signal-to-noise ratio without excessive complexity.
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 enhances the signal-to-noise ratio and reduces loading on the touch panel, improving touch performance by shielding noise and maintaining display quality.
Implementation Method 1
an insulation layer is provided on a side of the first metal mesh layer close to the OLED layer
Implementation Method 2
the bridge metal layer is connected to the first metal mesh layer through a via penetrating through the insulation layer
Implementation Method 3
an OLED layer and a touch panel layer on the OLED layer
Data Source
AI summary
The present application discloses an OLED display panel and a display apparatus. The OLED display panel includes an OLED layer and a touch panel layer on the OLED layer, the touch panel layer includes a first metal mesh layer, an insulation layer is provided on a side of the first metal mesh layer close to the OLED layer, and a second metal mesh layer and a bridge metal layer are provided on a side of the insulation layer close to the OLED layer, the bridge metal layer and the second metal mesh layer are arranged in a same layer and insulated from each other, and the bridge metal layer is connected to the first metal mesh layer through a via penetrating through the insulation layer.