Touch Sensing Electrode Width Segmentation for Accuracy
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Solution Overview
Problem
Touch-sensitive display devices face errors in touch sensing due to the differences in sensing methods used, leading to inaccurate detection of objects in contact or proximity.
Innovation Solution
A display device with drive electrodes arranged side by side, featuring a driver that supplies alternating drive signals to sensing electrodes, utilizing both mutual capacitance and self-capacitance sensing methods, where the drive electrodes are arranged in specific patterns to align the centers of sensing blocks, ensuring accurate object detection without errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both mutual capacitance sensing and self-capacitance sensing methods are used in combination to improve touch sensing accuracy, then the accuracy of touch sensing can be improved, but errors in touch sensing may occur due to different sensing methods
Solution Approach 1:
The drive electrodes are segmented into first drive electrodes and second drive electrodes with different widths, where the first width is an integer multiple of the second width. This segmentation allows the sensing area to be divided into first sensing areas (for mutual capacitance sensing) and second sensing areas (for self-capacitance sensing), enabling each sensing method to operate in optimized zones and reduce interference between methods
Solution Approach 2:
Different regions of the sensing area are assigned different sensing methods based on their local characteristics. The first sensing areas use mutual capacitance sensing while the second sensing areas use self-capacitance sensing. This local differentiation allows each sensing method to be applied where it is most effective, improving overall accuracy while minimizing errors from method conflicts
2Measurement precision
If drive electrodes are arranged with different widths in specific patterns, then the centers of sensing blocks can be aligned to reduce errors, but the device structure becomes more complex
Solution Approach 1:
The drive electrodes are designed with asymmetric width relationships where the first width is an integer multiple of the second width. This asymmetric design creates distinct first and second sensing areas with different geometric properties, allowing precise alignment of sensing block centers while maintaining a systematic rather than arbitrary complexity
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
The solution enhances the accuracy of touch sensing by aligning the centers of mutual capacitance and self-capacitance sensing blocks, reducing errors and improving the reliability of object detection, even in cases where other methods might produce ghost signals or misinterpret noise.
Implementation Method 1
sensing electrodes which produce capacitance between the drive electrodes and the sensing electrodes
Data Source
AI summary
According to one embodiment, a display device includes drive electrodes, sensing electrodes, a driver, a first sensor circuit, and a second sensor circuit, wherein the drive electrodes include first drive electrodes and second drive electrodes which are arranged between the adjacent first drive electrodes, and a first width of the first drive electrodes in a first direction is an integer multiple of a second width of the second drive electrodes in the first direction.