Capacitive Matrix Touchscreen Signal Contrast Correction
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Solution Overview
Problem
Current capacitive matrix touch screens in motor vehicles face challenges in providing reliable and robust operator control, especially when users glance at the control device for a short time, due to imprecise and fuzzy inputs from vibrations and brief visual contact.
Innovation Solution
The method modifies signal levels associated with matrix elements on a capacitive matrix touch screen by adjusting them based on upper and lower signal level limits, allowing for better detection of two-dimensional touches through interpolation and contrast correction, enabling accurate identification of desired touches for functions like virtual rotary control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal levels from capacitive matrix touch screen are directly used for touch detection, then the system remains simple, but the measurement precision deteriorates due to vibrations and brief visual contact causing imprecise and fuzzy inputs
Solution Approach 1:
The patent applies preliminary action by modifying signal levels before touch detection through contrast correction and interpolation. The signal processing steps (contrast correction module, interpolation module) are performed in advance to enhance touch detection accuracy before the actual touch identification occurs, thereby improving measurement precision without requiring complex real-time processing during touch interaction.
Solution Approach 2:
The patent introduces intermediary modules between the raw signal input and touch detection. The contrast correction module and interpolation module act as intermediaries that process and enhance the raw signal levels, converting imprecise vibration-affected signals into accurate touch detection data, thereby resolving the contradiction between simplicity and precision.
2Adaptability or versatility
If multiple touches are detected simultaneously on the touch screen, then the system can handle complex gestures, but the reliability of identifying the desired touch deteriorates due to fuzzy inputs from vibrations
Solution Approach 1:
The patent applies local quality by processing signal levels at individual matrix element locations through contrast correction and interpolation. Each touched location is enhanced independently, allowing the system to distinguish between multiple simultaneous touches even in the presence of vibrations. This localized signal enhancement maintains reliability for identifying the desired touch among multiple touches.
Solution Approach 2:
The patent performs preliminary signal processing through contrast correction and interpolation before multi-touch identification. By enhancing the signal quality in advance, the system can reliably distinguish between multiple touches and identify the desired one, even when vibrations cause fuzzy inputs, thereby maintaining both versatility and reliability.
3Ease of operation
If the touch screen is designed for brief glances during motor vehicle operation, then the ease of operation improves, but the measurement precision deteriorates due to the short time available for accurate touch input
Solution Approach 1:
The patent applies preliminary action by pre-processing signal levels through contrast correction and interpolation before touch detection. This enhances the quality of touch inputs, allowing operators to achieve accurate touch detection even during brief glances, thereby maintaining both ease of operation and measurement precision in motor vehicle contexts.
Solution Approach 2:
The patent replaces mechanical precision requirements with signal processing. Instead of relying on mechanically precise touch inputs during brief glances, the system uses electronic signal processing (contrast correction, interpolation) to enhance and clarify touch signals, thereby achieving accurate measurement without requiring high mechanical precision from the operator.
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 touch input detection, ensuring reliable operator control in motor vehicles by improving the identification of desired touches, even with imprecise and multiple touches, thus facilitating functions like radio frequency setting, volume control, and temperature selection.
Implementation Method 1
a capacitive, matrix touch screen, in particular a touch screen arranged in a motor vehicle, wherein touching the matrix touch screen in the region of a matrix element prompts a signal level associated with the matrix element to be produced
Data Source
AI summary
A method for the operation of a capacitive, matrix touchscreen for use in a motor vehicle, wherein touching the matrix touchscreen in the region of a matrix element produces a signal level associated with the matrix element, wherein the extent of a signal level which is produced by touching the matrix touchscreen in the region of the matrix element and which is associated with the matrix element is altered, and wherein the thus modified signal levels of two adjacent matrix elements are taken as a basis for determining whether the two matrix elements are being touched as part of collective areal touching of the matrix touchscreen.