In-Cell Touch Display Panel Layered Electrode Design
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Solution Overview
Problem
Existing in-cell touch display panels experience a high load during touch detection, which affects their thickness and efficiency.
Innovation Solution
A display panel design where the first touch layer is arranged in a different layer from the first electrode layer, with mesh-shaped touch electrodes that are insulated and partially overlapped with the electrode, allowing driving signals to be shared, reducing the voltage difference and load on the touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch layer and electrode layer are arranged in different layers and insulated from each other, then the voltage difference between touch electrodes and electrodes is reduced, but the structural complexity increases
Solution Approach 1:
The patent transitions from a planar arrangement where touch electrodes and electrodes are in the same layer to a three-dimensional stacked arrangement with multiple layers. The touch layer is positioned above the electrode layer and insulated from it, creating vertical separation that reduces voltage difference while maintaining electrical isolation. This dimensional change allows both functions to coexist without direct electrical interference.
Solution Approach 2:
An insulation layer is introduced as an intermediary between the touch layer and the electrode layer. This insulation layer prevents direct electrical contact between the two layers, allowing them to be arranged in different layers while maintaining proper electrical isolation. The intermediary enables the stacked configuration without causing short circuits or unwanted voltage differences.
2Measurement precision
If mesh-shaped touch electrodes with multiple segments are used, then the touch detection accuracy is improved, but the manufacturing complexity increases
Solution Approach 1:
The touch electrodes are designed as mesh-shaped structures composed of multiple electrode segments that are crossed to form meshes. This segmentation divides the continuous electrode into discrete segments that can be independently controlled and optimized for touch detection. The segmented mesh structure improves touch detection accuracy by creating multiple sensing points while the regular pattern facilitates standardized manufacturing processes.
3Power
If the orthographic projection of touch electrode segments falls within the electrode projection, then the load on touch electrodes is reduced, but the area utilization is compromised
Solution Approach 1:
The patent positions the touch layer and electrode layer such that their projections overlap in the planar view. The orthographic projection of at least one touch electrode segment falls within the orthographic projection of the electrode, creating a merged footprint. This overlapping arrangement allows both the touch detection function and the electrode function to share the same planar space, reducing the overall device area while the vertical stacking maintains low load on touch electrodes through insulation.
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a first substrate, a first electrode layer, a first touch layer and multiple light-emitting units. The first electrode layer includes a first electrode, and the first electrode includes multiple first hollows. The first touch layer is arranged in a different layer from the first electrode layer and is insulated from the first electrode layer. The first touch layer includes multiple first touch electrodes, each of the first touch electrodes includes multiple touch electrode segments. An orthographic projection of at least one of the touch electrode segments on the first substrate falls within an orthographic projection of the first electrode on the first substrate, so that the first touch electrodes are at least partially overlapped with the first electrode in a direction perpendicular to a plane where the first substrate is located.