Three-Axis Touch Sensor Electrode Segmentation
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Solution Overview
Problem
Current multi-touch sensing arrangements in capacitive touch screens are time-consuming due to the sequential driving of electrodes, which prolongs the processing time for determining touch points on the touch-sensitive surface.
Innovation Solution
A display apparatus with a touch-sensing module featuring electrodes in three axes, where one layer of sensing electrodes is electrically connected, simplifying signal analysis and calculations, and allowing for rapid coordinate transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sequential driving of electrodes is used in conventional multi-touch sensing arrangements, then the structure is simple and easy to manufacture, but the processing time for determining touch points is prolonged
Solution Approach 1:
The sensing arrangement is segmented into three distinct electrode layers: first driving electrodes, second driving electrodes, and sensing electrodes. This segmentation allows parallel processing of touch detection in different spatial dimensions, reducing the overall processing time compared to sequential single-layer driving methods
Solution Approach 2:
The patent introduces a third dimension by stacking electrode layers vertically. The first and second driving electrodes are arranged in different layers with their extending directions intersecting, enabling simultaneous multi-axis touch detection without increasing the number of sequential processing steps
2Measurement precision
If multiple receivers are used in conventional multi-touch sensing arrangements, then the measurement precision of touch points is improved, but the signal analysis and calculations become more complex
Solution Approach 1:
The sensing function is segmented and distributed across three electrode layers with distinct roles. The first and second driving electrodes generate electromagnetic fields in different directions, while the sensing electrodes detect capacitance changes. This segmentation maintains high measurement precision through multi-axis detection while simplifying signal analysis by separating driving and sensing functions
Solution Approach 2:
By adding the vertical dimension with stacked electrode layers, the system achieves three-dimensional touch detection capability. The intersecting extending directions of first and second driving electrodes enable precise touch point localization in x-y coordinates, while the single sensing electrode layer reduces the number of receivers needed compared to conventional multi-receiver arrangements
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 design reduces processing time by enabling quicker determination of touch points and improving response speed, as only one receiver is required for signal reception, simplifying signal analysis and calculations.
Implementation Method 1
An object (e.g., finger, stylus, etc.) in contact with or in proximity to touch-sensitive surface 130 can induce the change of the coupling capacitance between the sensing electrodes 131 and the driving electrodes 133
Data Source
AI summary
A display apparatus with touch sensor at least includes a display module and a touch-sensing module coupled to the display module. The display module comprises a first substrate, a second substrate and a display medium layer disposed therebetween. The touch-sensing module comprises a first electrode layer, a second electrode layer and a third electrode layer. The first electrode layer comprises plural first driving electrodes arranged along a first direction, and the second electrode layer comprises plural second driving electrodes arranged along a second direction, wherein the first and second directions are intersected. The third electrode layer comprises plural sensing electrodes which are electrically connected to each other.