Touch Structure with Conductive Plates for Camera Hole Compensation
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Solution Overview
Problem
Existing touch display screens face challenges in maintaining touch performance around camera holes due to the absence of touch patterns, leading to compromised capacitance compensation and a risk of bridge breaking, which disrupts touch signal transmission.
Innovation Solution
A touch structure with intersecting mesh electrodes and conductive plates is designed, where cross-window rows and columns include conductive bridges and dummy plates to compensate for missing mesh patterns, ensuring reliable touch signal transmission without over-compensation and reducing the risk of bridge breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch patterns are removed in the window region to accommodate camera holes, then the display area is improved, but touch performance and capacitance compensation deteriorate
Solution Approach 1:
The touch electrode structure is segmented into mesh electrodes for the touch region and conductive plates for the window region. This segmentation allows each part to be optimized for its specific function: mesh electrodes provide touch sensitivity while conductive plates maintain capacitance compensation in the camera hole area without requiring full mesh patterns.
Solution Approach 2:
Different structures are applied to different regions: mesh electrodes are used in the touch region where touch control is needed, while conductive plates are used in the window region where only capacitance compensation is required. This local differentiation maintains touch performance where needed while maximizing display area in the camera hole region.
2Reliability
If conductive bridges are added to connect mesh blocks around window regions, then touch signal transmission is improved, but the risk of bridge breaking increases
Solution Approach 1:
Dummy plates are strategically positioned adjacent to conductive bridges to provide mechanical support and cushioning before stress can cause bridge breaking. These dummy plates act as preventive structural elements that absorb mechanical stress and protect the fragile conductive bridges from breaking during assembly or use.
Solution Approach 2:
Dummy plates serve as intermediary structures between the conductive bridges and the rigid substrate. They mediate the mechanical stress distribution, preventing direct stress concentration on the thin conductive bridges while still allowing electrical connection to be maintained.
3Reliability
If conductive plates are used to compensate for missing mesh patterns, then capacitance compensation is improved, but the risk of over-compensation increases
Solution Approach 1:
The area of conductive plates is precisely controlled based on the specific missing mesh pattern in each window region. By adjusting the parameters (area, shape, position) of conductive plates to match the exact capacitance deficit, accurate compensation is achieved without over-compensation. The conductive plate area is designed to correspond to the area of missing mesh electrodes.
4Reliability
If mesh electrodes are extended across window regions, then touch control continuity is improved, but the risk of bridge breaking and open circuits increases
Solution Approach 1:
The continuous mesh electrode structure is segmented at window regions and replaced with conductive plates. This segmentation prevents the need for complex bridges to maintain continuity across camera holes, while dummy plates provide the necessary mechanical support. The segmentation simplifies the overall structure by eliminating fragile bridge connections.
Data Source
AI summary
A touch structure and a display panel are provided. The touch structure includes: first mesh electrodes extending in a first direction and second mesh electrodes extending in a second direction. The touch structure is absent in a window region. First mesh electrodes include at least one cross-window row separated by the window region, which includes a first cross-window row including: a first window mesh block adjacent to the window region and on a first side of the window region; a first conductive plate directly connected to mesh lines of the first window mesh block; and a first non-window mesh block on a side of the first window mesh block away from the window region; second mesh electrodes include at least one cross-window column including a first cross-window column which includes: a second window mesh block; a second conductive plate; and a second non-window mesh block.