Touch Detection Device Using 3D Waveform Barycenter Analysis
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Solution Overview
Problem
Existing touch detection devices, such as those described in JP-A-2010-55510, face limitations in accurately determining the touch point or proximity point on a capacitive touch panel due to their reliance on two fixed threshold values, which can lead to inaccuracies in user input detection and control.
Innovation Solution
A display device with a touch detection function that includes a plurality of touch detection electrodes and drive electrodes, an operation drive unit, and a touch detection unit. The touch detection unit derives a three-dimensional waveform from signal values at the touch location, calculates barycenters based on threshold values, and determines the contact or proximity point by analyzing a straight line connecting these barycenters to accurately detect user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two fixed threshold values are used to classify detected signals into two regions, then the device complexity is reduced and the operation is simplified, but the measurement precision of the touch point or proximity point deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional classification system (two threshold values creating two regions) to a three-dimensional analysis system (three threshold values creating three regions with volume barycenter calculation). This dimensional expansion enables more precise touch point detection by adding another layer of spatial differentiation, allowing the system to distinguish between different touch intensities and locations more accurately while maintaining manageable device complexity through systematic processing of the additional dimension.
2Ease of operation
If the area barycenter method is used to determine the touch point, then the calculation process is simplified, but the control accuracy of user input deteriorates due to the difference between the determined touch point and the intended contact point
Solution Approach 1:
The patent divides the touch detection space into three distinct regions using three threshold values instead of two, creating a more granular segmentation of touch intensity levels. This segmentation allows the volume barycenter calculation to more accurately represent the actual touch location by considering the distribution of signal strength across multiple regions, thereby reducing the discrepancy between the calculated touch point and the user's intended contact point while maintaining computational feasibility.
Solution Approach 2:
The patent changes the fundamental parameters of the touch detection system by introducing a third threshold value and transitioning from area barycenter to volume barycenter calculation. This parameter change transforms the detection model from a two-region to a three-region system, enabling more accurate representation of touch characteristics and improving control accuracy without significantly increasing the operational complexity for the user.
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 approach enhances the accuracy of user input detection and control by deriving the axial direction of the pointer and determining the intended contact or proximity point on the touch panel, thereby improving user interaction with the device.
Implementation Method 1
capacitance is formed between drive electrodes to which a drive signal is applied. The capacitive touch detection device detects whether there is a touch or not by detecting a change in capacitance caused by an external object being brought into contact with or proximity to the device
Data Source
AI summary
According to an aspect, a display device with a touch detection function, during a touch detection operation, derives a signal value based on the touch detection signal at coordinates at which the pointer is in contact with or in proximity to the device and in the vicinity of the coordinates; derives a three-dimensional waveform which employs a magnitude of the signal value as a height direction; derives a straight line in the three-dimensional waveform, the straight line connecting between a barycenter based on a volume of a three-dimensional waveform portion equal to or greater than a first threshold value in the height direction and a barycenter based on a volume of a three-dimensional waveform portion equal to or greater than a second threshold value in the height direction; and detects based on the straight line whether the pointer is in contact with or in proximity to the device.