Touch Display Panel Segmentation for Active Pen Accuracy
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Solution Overview
Problem
Existing capacitive touch display panels suffer from reduced touch accuracy due to interference from coupling signals generated by conductive film layers, particularly when using active pens, leading to decreased signal-to-noise ratios and accuracy issues, especially in larger panels.
Innovation Solution
The touch display panel is designed with a touch layer divided into multiple independent touch islands, each connected to a switching circuit that switches on or off the sensing electrodes, reducing the area and resistive/capacitive load, and improving the signal-to-noise ratio by detecting sensing signals sequentially.
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 coupling signals from conductive film layers cause interference 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 electrically isolated from others by gaps, which prevents coupling signals from conductive film layers from interfering across the entire touch layer. This segmentation maintains large area coverage while eliminating the interference path that reduces touch accuracy.
2Measurement precision
If the touch layer area is reduced to minimize coupling signals, then touch accuracy improves, but the display area is compromised
Solution Approach 1:
Instead of reducing the overall touch layer area, the solution segments it into multiple smaller touch islands. The gaps between islands prevent signal coupling while the array arrangement maintains comprehensive coverage. This allows the display to keep its full area without suffering from increased coupling interference.
3Measurement precision
If switching circuits are added to control sensing electrodes, then signal-to-noise ratio improves, but device complexity increases
Solution Approach 1:
Switching circuits are introduced to dynamically control the connection between touch electrodes and bonding parts. These switches can be turned on or off based on detection needs, allowing the system to adaptively manage signal paths. This dynamic control improves signal-to-noise ratio by enabling selective activation of touch islands without permanently increasing circuit complexity.
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.