Touch Display Electrode Segmentation for Better Sensing
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Solution Overview
Problem
Existing touch display devices face a challenge in improving touch sensing performance without compromising image display performance, as the integration of touch electrodes can interfere with image display functions.
Innovation Solution
The touch display device is designed with a touch sensor structure that includes a plurality of light-emitting elements on an active area, an encapsulation layer, and touch electrodes and routing lines, divided into sub-areas by boundaries, with touch routing lines positioned on the boundaries to avoid overlapping, reducing load and enhancing touch sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes are integrated into the display panel to improve touch sensing performance, then touch sensing capability is enhanced, but image display performance deteriorates due to interference from the touch electrode structure
Solution Approach 1:
The active area is divided into multiple sub-areas by first and second boundaries, with touch electrodes and routing lines strategically positioned in specific sub-areas. This segmentation allows the touch sensing function to be distributed across multiple regions, reducing the interference impact on any single pixel's image display quality while maintaining overall touch sensitivity.
Solution Approach 2:
Different regions of the display panel are assigned different functions: some sub-areas contain touch electrodes and routing lines while others are optimized for image display. The touch routing lines are specifically positioned on the first boundary rather than the second boundary, creating local variations in electrode distribution that optimize both touch sensing in certain regions and image display quality in others.
2Measurement precision
If touch routing lines are positioned on boundaries between sub-areas to reduce overlap, then touch sensing performance is improved, but device complexity increases due to the specific boundary positioning requirements
Solution Approach 1:
The display panel is segmented into multiple sub-areas with clear boundaries, and touch routing lines are assigned to specific boundaries (first boundary but not second boundary). This segmentation simplifies the routing design by providing predetermined paths along the boundaries, reducing the complexity of avoiding overlaps while maintaining effective touch sensing coverage.
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 structure maintains image display performance while improving touch sensing capabilities by reducing the load on touch electrodes and optimizing their distribution across sub-areas, thereby enhancing overall touch sensing performance.
Implementation Method 1
The display devices can drive the plurality of touch electrodes, and can sense the touch of the user by detecting a change of a capacitance generated when the user touches the display panel.
Data Source
AI summary
The disclosure is related to a touch display device including a display panel. By dividing an active area of the display panel into a plurality of sub-areas, and driving a touch electrode disposed on each of the plurality of sub-areas separately, a load of the touch electrodes is reduced depending on a size of the display panel and a performance of a touch sensing can be improved.