In-Vehicle Touch Panel Static Discharge via Conducting Member
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Solution Overview
Problem
Existing in-vehicle touch panels suffer from missed detection or erroneous detection due to static electricity charges on a user's body, which are not effectively discharged by previous methods, especially when the user operates the input device.
Innovation Solution
An in-vehicle input device with a conducting member made of metal, positioned adjacent to the operation unit, that brings the user's hand into conduction with the system ground, ensuring charges are discharged and preventing missed or erroneous detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitance sensor is used to detect touch operations, then the touch panel can provide various information input screens, but missed detection or erroneous detection occurs due to static electricity charges on the user's body
Solution Approach 1:
A conducting member is introduced as an intermediary between the user's hand and the capacitance sensor. This conducting member is connected to ground potential and serves to discharge static electricity from the user's hand before it reaches the sensor, thereby eliminating the harmful static charge effect while preserving the touch detection function
Solution Approach 2:
The harmful static electricity charge is extracted from the user's hand through the conducting member connected to ground. By providing a dedicated discharge path, the static charge is removed from the system before it can interfere with the capacitance sensor operation
2Reliability
If charges on the user's body are discharged through a conducting portion on the seating surface, then the human body can be prevented from being charged, but this method is little effective for charges in the vicinity of the user's hand operating the touch panel
Solution Approach 1:
Instead of relying on a distant seating surface conductor, a conducting member is placed locally adjacent to the input unit where the user's hand naturally rests. This local placement ensures that the discharge path is immediately accessible to the user's hand during operation, making the charge discharge effective right at the point of interaction
3Reliability
If the conducting member is positioned adjacent to the operation unit, then charges on the user's hand are effectively discharged, but the device structure becomes more complex
Solution Approach 1:
The conducting member serves multiple functions: it acts as a static charge discharge path, provides an ergonomic hand rest surface, and can be integrated with the existing housing or frame structures. By combining these functions into a single component, the structural complexity is minimized while achieving the desired reliability improvement
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
The conducting member effectively discharges static electricity from the user's hand, preventing missed or erroneous detection and ensuring accurate operation of the touch panel by maintaining the potential of the user's hand at system ground level.
Implementation Method 1
a conducting member 120...which brings the user's hand into conduction with the system ground, ensuring charges are discharged
Implementation Method 2
The capacitance sensor measures a capacitance...the position of a touch by the user is determined on the basis of states of detection by the sensor elements
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An in-vehicle input device (100) includes an LCD (111) that a user operates to input information, a capacitance sensor (112) that electrically detects an operation on the surface of the LCD (111), and a conducting member (120) positioned in the vicinity of the LCD (111) such that the member is come into contact with part of a hand of the user when the user operates the LCD (111). The conducting member (120) is electrically connected to system ground for the capacitance sensor (112).