Touch Panel Island Switching Layout for Large-Screen Accuracy
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Solution Overview
Problem
Existing capacitive touch display panels suffer from reduced touch accuracy due to interference from conductive film layers, which generate coupling signals that degrade the signal-to-noise ratio, especially when using active pens, and this issue is exacerbated by larger panel sizes.
Innovation Solution
The touch display panel is designed with a split touch layer into multiple independent touch islands, each connected via switching circuits, reducing the area and resistive/capacitive load, and utilizing a lead-out area for bonding to improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a continuous touch layer is used, then the touch display panel can cover a large area, but the conductive film layer generates coupling signals that interfere with sensing signals and reduce touch accuracy
Solution Approach 1:
The continuous touch layer is divided into multiple independent touch islands arranged in an array. Each touch island is separated by gaps and has its own switching circuit, which isolates the conductive film layers and prevents coupling signal interference between adjacent islands, thereby improving touch accuracy while maintaining large area coverage
Solution Approach 2:
The conductive film layers are extracted and isolated into separate touch islands. By separating the conductive elements spatially and electrically through gaps and switching circuits, the coupling signals between conductive films are eliminated, allowing the large-area panel to maintain high touch accuracy
2Area of stationary object
If the panel size is increased, then the display area is enlarged, but the coupling signals from conductive film layers become more significant and degrade the signal-to-noise ratio
Solution Approach 1:
The large panel is segmented into multiple independent touch islands, each with its own switching circuit. This segmentation limits the extent of conductive film layers, reducing the area over which coupling signals can propagate and thereby maintaining a high signal-to-noise ratio even in large panels
Solution Approach 2:
The conductive film layers are extracted and confined to individual touch islands separated by gaps. This extraction prevents coupling signals from spanning the entire panel, ensuring that noise from conductive films does not degrade the signal-to-noise ratio across the large display area
3Device complexity
If a single touch layer is used, then the structure is simple, but the resistive and capacitive load is high, reducing touch accuracy
Solution Approach 1:
The touch layer is segmented into multiple independent touch islands, each with its own switching circuit. This segmentation reduces the resistive and capacitive load on each island compared to a single continuous layer, thereby improving touch accuracy while the overall array structure maintains system functionality
Solution Approach 2:
Switching circuits are introduced to dynamically control the connection between touch islands and the bonding part. The switching elements can be turned on or off based on control signals, allowing the system to adaptively manage electrical connections and reduce parasitic effects, thereby improving touch accuracy
Data Source
AI summary
The touch display panel includes a display area and a peripheral area located outside the display area. Part of the peripheral area protrudes in a direction away from the display area to form a lead-out area. The lead-out area has a bonding part. The touch display panel includes a display substrate, a touch layer, and switching circuits. The touch layer is provided on a side of the display substrate, and includes at least two touch islands arranged in an array. There is a gap between two adjacent touch islands. Each touch island includes at least two touch electrodes. The touch electrodes include at least two sensing electrodes for outputting sensing signals. The switching circuits are at least partially provided in the peripheral area. A touch island is connected to the bonding part through a switching circuit