Inclined Touch Panel Coordinate Correction
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Solution Overview
Problem
Touch panels in vehicle-mounted information equipment, such as navigation systems, face usability issues when mounted at an incline or operated from the sides, leading to inaccuracies in finger position detection due to mismatched coordinate systems, which existing technologies fail to adequately address.
Innovation Solution
A display input device equipped with a touch panel and proximity sensors that correct x and y coordinates of an approaching object using angles of elevation and deviation, along with a control unit that adjusts these coordinates based on the object's distance from the panel surface, ensuring accurate alignment and enhanced usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel is mounted at an incline to meet design requirements, then the device can be installed in various vehicle configurations, but the finger position detection accuracy deteriorates due to coordinate system mismatch
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the coordinate transformation parameters based on the touch panel's mounting angle. The control unit calculates correction values using the detected mounting angle θ and applies these corrections to the detected finger position coordinates, thereby maintaining accurate position detection regardless of the panel's inclination.
Solution Approach 2:
The system dynamically adapts to different mounting configurations by detecting the mounting angle in real-time and continuously adjusting the coordinate transformation. This dynamic adjustment allows the system to maintain measurement precision across various installation scenarios without requiring physical reconfiguration.
2Measurement precision
If the touch panel is positioned horizontally in front of the user's eyes, then the finger position detection accuracy is improved, but the device complexity increases due to additional coordinate correction mechanisms
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with a computational solution. Instead of physically adjusting the panel to be perfectly horizontal, the system uses software-based coordinate transformation algorithms that calculate and apply corrections based on the detected mounting angle, thereby maintaining simplicity while achieving accurate detection.
Solution Approach 2:
The control unit automatically detects the mounting angle and performs coordinate corrections without requiring manual intervention or complex external calibration equipment. The system self-adjusts to compensate for mounting variations, eliminating the need for additional complex correction mechanisms.
3Ease of operation
If the user operates the touch panel from the side (driver or passenger seat), then the device can be used by multiple users, but the measured finger position deviates from the actual touched position
Solution Approach 1:
The system changes the coordinate transformation parameters based on the detected mounting angle, which inherently accounts for different user positions. When the panel is mounted at an angle suitable for side operation, the correction algorithm adjusts the coordinate mapping to align with the user's viewing and touching perspective, maintaining accuracy for multi-user scenarios.
Data Source
AI summary
A display input device includes a control unit for correcting horizontal coordinates of an object to be detected on an xy coordinate plane extending on a touch panel 1, which are acquired by a proximity sensor 12, according to an angle of elevation φ, an angle of deviation θ and a vertical distance z between the object to be detected and a surface of the touch panel, φ being the angle of a straight line OC with respect to the surface of the touch panel, the straight line OC extending between a predetermined point O positioned on the touch panel and a predetermined point C positioned outside the touch panel, and θ being the angle between a straight line which is an orthogonal projection of the line OC onto the xy coordinate plane, and an x axis on the xy coordinate plane.