Automotive Display Position Sensing via Capacitive Touch Coupling

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Solution Overview

Problem

Existing systems for recognizing the position of automotive displays, particularly in sliding or pop-up configurations, are inefficient as they require manual confirmation using a stop switch, leading to impractical operation control processes and potential inaccuracies in determining the display's position and balance.

Innovation Solution

A system utilizing a capacitive touch sensor and conductors within the vehicle cockpit to accurately measure the display's position without a physical switch, enabling real-time recognition of the display's position and balance through capacitive changes, allowing for precise control of the actuator.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a stop switch is used to determine the position of the display, then the position can be confirmed at specific points, but the position cannot be accurately recognized at intermediate points and the operation control process becomes impractical

Engineering Contradiction:

Improvedisplay position recognition accuracyVSAvoidoperation control process

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent replaces the mechanical stop switch system with a capacitive sensing system. The controller detects the position of the conductive object (display) by measuring capacitive coupling between the conductor and the touch sensor, eliminating the need for physical switches and enabling continuous position detection throughout the movement range.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a conductor as an intermediary element between the display and the touch sensor. This conductor acts as a mediator that transmits position information to the sensor through capacitive coupling, enabling indirect detection of the display position without direct mechanical contact.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the display is moved to the initial position to control the stop switch, then the physical position can be confirmed, but the operation process becomes complex and time-consuming

Engineering Contradiction:

Improveposition confirmation reliabilityVSAvoidoperation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs self-diagnosis and self-positioning by automatically detecting the display position through capacitive sensing. The controller continuously monitors the capacitive coupling between the conductor and touch sensor, enabling the system to determine its own state without requiring manual intervention or reset operations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The capacitive sensing system operates continuously to detect display position, eliminating the need for periodic resets to initial positions. The conductor maintains continuous capacitive coupling with the touch sensor throughout the display movement, providing uninterrupted position information for real-time control.

Inventive Principle:

Principle #20Continuity of useful action

3Difficulty of detecting and measuring

If a physical stop switch is arranged to determine display position, then position detection is possible, but the device complexity increases and the system becomes less practical

Engineering Contradiction:

Improveposition detection capabilityVSAvoidsystem structure

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The touch sensor serves multiple functions: it acts as both the user interface for touch input and the position detection sensor. The conductor serves dual purposes as both a structural element and a sensing element through its capacitive coupling properties, eliminating the need for separate position detection hardware.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the position detection function with the existing touch sensor and conductor elements. By combining these components into an integrated system where the conductor and touch sensor work together through capacitive coupling, the patent eliminates the need for separate mechanical position detection mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

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

Enables accurate and efficient measurement of the display's position and balance, eliminating the need for manual switches and improving operational control by using capacitive touch sensing and conductor-based position detection.

Implementation Method 1

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentEP4325337B1System and method for recognizing position of automotive display

Publication Date: 2025.12.03 HYUNDAI MOBIS CO LTD

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AI summary

The present invention relates to a system and method for recognizing a position of an automotive display. The system for recognizing a position of an automotive display according to the present invention includes an automotive display having a touch sensor disposed on one side thereof, conductors that are disposed inside a vehicle cockpit to generate a change in capacitance for the touch sensor, and a control unit that obtains touch data according to the change in capacitance, analyzes a touch input pattern, and calculates position coordinate data and touch coordinate data of the automotive display.