Touchscreen Signal Filtering for Vehicle Vibration
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Solution Overview
Problem
Operating a touchscreen in a vehicle environment is challenging due to parallax errors, unsteady finger movements, and vibrations, leading to inaccurate actuations and a sluggish display response.
Innovation Solution
A method that filters position signals from touchscreen inputs to suppress irregular movement components, using adaptive filtering parameters based on vehicle state, such as speed and acceleration, to enhance precision and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touchscreen area is heavily used with multiple functions, then the information density and functionality are improved, but the button size becomes very small making exact actuation difficult
Solution Approach 1:
A camera is introduced as an intermediary device to capture the driver's gaze direction and overlay virtual buttons at the corresponding retinal location. This mediator translates physical touchscreen coordinates into perceived visual coordinates, allowing large virtual buttons to be displayed at the fovea even when the physical touchscreen is small and densely packed with functions.
2Reliability
If a constant low-pass filtering is applied to eliminate vibrations, then the vibration elimination is improved, but the display response becomes sluggish
Solution Approach 1:
The filtering parameters are made dynamic rather than constant. The system continuously adapts the low-pass filter characteristics based on detected vibration levels and driving conditions. During high-vibration periods, stronger filtering is applied; during calm periods, filtering is reduced to maintain responsive display updates, thus eliminating the trade-off between vibration elimination and response speed.
3Area of stationary object
If the touchscreen is located in the central area of the dashboard, then the space utilization is improved, but parallax errors occur causing actuation outside the intended area
Solution Approach 1:
The system uses eye-tracking feedback to continuously monitor the driver's gaze direction and adjust the virtual button positioning accordingly. By overlaying buttons at the precise retinal location where the driver is looking, the system compensates for parallax errors and ensures accurate actuation even when the physical touchscreen is positioned in the central dashboard area for optimal space utilization.
Data Source
AI summary
A method for operating an electronic device via a touchscreen, wherein the operation is carried out on the basis of a position signal generated by an input movement touching the touchscreen, includes carrying out a filtering of the position signal in such a way that at least one movement component of the input movement is at least partially suppressed, wherein a filtered position signal is obtained, and actuating the electronic device on the basis of this filtered position signal.