Dual-Display Wearable IPD Control Using Hall Sensor Tracking

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Solution Overview

Problem

Existing wearable electronic devices, such as head-mounted displays, struggle to accurately adjust the distance between displays to match the inter-pupillary distance of individual users, leading to blurry images and user discomfort due to varying inter-pupillary distances among individuals.

Innovation Solution

Incorporating a hall sensor and a magnet that moves linearly relative to the displays, allowing a processor to adjust the distance between the left and right displays based on magnetic force data to align with the user's inter-pupillary distance, using a method that involves obtaining magnetic force data in multiple directions through the hall sensor as the magnet moves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a mechanical method is used to allow the user to set the inter-display distance, then the user can adjust the display distance to fit her eyes, but the device may fail to display the screen according to the current inter-display distance, resulting in a blurry image and increased eye fatigue

Engineering Contradiction:

Improveuser ability to adjust display distanceVSAvoidaccuracy of display distance adjustment

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical distance adjustment system with a magnetic field-based detection system. A magnet is attached to the display assembly that moves with the mechanical adjustment, while a Hall sensor detects the magnet's position through magnetic field changes. This substitution allows the system to accurately measure the actual display distance and compensate for mechanical inaccuracies through software control, thereby resolving the contradiction between ease of mechanical adjustment and measurement precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the inter-display distance is fixed, then the device structure is simple, but it cannot accommodate varying inter-pupillary distances among different users

Engineering Contradiction:

Improvecompatibility with different user IPDVSAvoidcomplexity of distance adjustment mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a self-service mechanism where the system automatically detects the user's inter-pupillary distance and adjusts the display parameters without requiring manual intervention. The Hall sensor continuously monitors the magnet's position, and the processor automatically calculates and applies the appropriate display configuration. This automated approach provides adaptability to different users while minimizing the complexity of user operations, effectively resolving the contradiction between versatility and device complexity.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If multiple sensors are used to accurately detect magnet position in multiple directions, then the measurement precision is improved, but the device complexity and cost increase

Engineering Contradiction:

Improveaccuracy of magnet position detectionVSAvoidnumber of sensors and components

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the detection parameter from direct mechanical position measurement to magnetic field strength measurement. By attaching a magnet to the moving display assembly and using a Hall sensor to detect magnetic field variations, the system can infer the display distance and magnet position with high precision. This parameter change allows accurate multi-directional detection using a single sensor rather than multiple mechanical sensors, resolving the contradiction between measurement precision and device complexity.

Inventive Principle:

Principle #35Parameter changes

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 solution enables precise adjustment of display distances to match the user's inter-pupillary distance, reducing image blur and eye fatigue by ensuring clear and comfortable viewing experiences.

Implementation Method 1

obtain magnetic force data in a plurality of directions through the hall sensor while the magnet moves from a first end to a second end of a movable distance

Methodology Applied

Scientific EffectMagnetic field detection: Hall Effect

Data Source

PatentUS20250347922A1Wearable electronic device comprising plurality of displays, and method for controlling same

Publication Date: 2025.11.13 SAMSUNG ELECTRONICS CO LTD

AI summary

According to one embodiment, a wearable electronic device comprises: a Hall sensor; a magnet; a first display; a second display arranged side by side with the first display; and at least one processor operably connected to the Hall sensor, the first display, and the second display. The magnet moves the same distance in a straight line to the left and right with respect to the Hall sensor in a first direction, parallel to the direction in which the first display and the second display are arranged, according to the distance between the first display and the second display. The at least one processor can obtain magnetic force data in a plurality of directions through the Hall sensor while the magnet moves from a first end to a second end of a movable distance in response to a change in the distance between the first display and the second display, and obtain information about the relationship between magnetic force data and the distance between the first display and the second display on the basis of magnetic force data in the first direction and magnetic force data in the second direction among the magnetic force data in the plurality of directions.