Touch Display Electrode Segmentation for Ghost Touch Identification
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Solution Overview
Problem
Touch display devices face challenges in distinguishing between actual and ghost touches, particularly when the number of touch electrodes and lines is increased to improve sensitivity, leading to signal overlap and difficulty in differentiating touches in divided areas.
Innovation Solution
The arrangement of touch electrodes is optimized by dividing the display panel into blocks with varying touch line connections, including different sizes and numbers of electrodes, and adjusting jumping intervals to reduce the number of touch lines and sensing units, allowing for effective identification of ghost touches through signal distribution analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch electrodes and touch lines is increased to improve touch sensitivity, then touch sensitivity is improved, but device complexity and signal overlap increase making it difficult to distinguish actual touches from ghost touches
Solution Approach 1:
The display panel is divided into multiple divided areas, and touch electrodes are grouped into touch electrode groups within each divided area. Each touch electrode group is connected to a separate touch line, creating distinct sensing zones. This segmentation reduces signal overlap between adjacent electrodes and enables independent sensing in each divided area, thereby distinguishing actual touches from ghost touches while maintaining adequate sensitivity through localized electrode groups.
2Measurement precision
If the number of touch electrodes is increased to improve touch sensitivity, then touch sensitivity is improved, but the difficulty of detecting and measuring actual touches versus ghost touches increases
Solution Approach 1:
By dividing the display panel into multiple divided areas with distinct touch electrode groups, the patent creates spatially separated sensing zones. This segmentation allows the touch sensing unit to independently analyze touch signals from each divided area, making it easier to differentiate between actual touches (which will show consistent signal patterns in specific divided areas) and ghost touches (which will show inconsistent or overlapping signals across multiple divided areas).
Solution Approach 2:
The touch sensing unit analyzes touch signals from multiple touch lines and divided areas to determine whether a detected touch is an actual touch or a ghost touch. This feedback mechanism uses the spatial distribution and signal characteristics from segmented areas to validate touch authenticity, improving the ability to distinguish between real and false touch inputs while maintaining high touch sensitivity.
3Device complexity
If touch lines are reduced to simplify device complexity, then device complexity is reduced, but the ability to sense touches in divided areas independently is compromised
Solution Approach 1:
The patent divides the display panel into multiple divided areas, with each area containing touch electrode groups that are connected to dedicated touch lines. This segmentation strategy reduces the total number of touch lines needed compared to having individual lines for each electrode, while still maintaining the ability to independently sense touches in different divided areas. The grouped electrode structure within each divided area allows efficient signal collection with fewer lines, preserving touch differentiation capability while simplifying the overall device complexity.
Data Source
AI summary
A touch display device and a touch driving method thereof enable to effectively identify a ghost touch while reducing a number of touch lines and touch sensing units by differently disposing an arrangement of the touch electrodes to which the touch lines are connected for each touch block.