Head Mount Display Image Inversion Fix

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Solution Overview

Problem

Existing head mount displays (HMDs) face challenges in determining the correct attachment position for the image display unit when the observer is in a horizontal position, leading to improper positioning and malfunction.

Innovation Solution

A monocular head mount display with a frame, image display unit, fixing part, and detection part that allows the image display unit to adjust its attitude relative to the frame, enabling suitable image display for either eye without turning the image upside down, regardless of the observer's attitude, through a system of rotatable and detachable components with magnetic or light-based detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the detection direction of the acceleration sensor is the horizontal direction, then the device structure is simple, but it is impossible to determine the attachment position of the image display unit when the observer lies on their back

Engineering Contradiction:

Improvesensor detection direction configurationVSAvoidattachment position determination accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the acceleration sensor detection direction from fixed horizontal to vertical direction, and dynamically determines attachment position based on the observer's attitude (upright or lying down). This allows the system to adapt to different observation scenarios while maintaining simple sensor configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the detection parameter from horizontal acceleration to vertical acceleration, and uses the magnitude of vertical acceleration to determine both the observer's attitude and the image display unit's attachment position. This parameter change enables reliable position determination across different observation scenarios.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the image display unit is fixed to the frame in a specific attitude, then the image display is stable for one eye, but the device cannot switch between left and right eye positions

Engineering Contradiction:

Improveimage display stabilityVSAvoideye position switching capability

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The fixing part is designed to be rotatable relative to the frame, allowing the image display unit to switch between different attitudes (left eye position and right eye position). The system dynamically adjusts the image orientation based on the detected attachment position while maintaining stable display for the current eye.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The fixing part serves multiple functions: it can fix the image display unit in different attitudes for left or right eye observation, and it enables switching between these positions. This multi-functional design provides both stability for each eye and versatility for switching between eyes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the image display unit is made detachable for easy switching, then the operation convenience is improved, but the device complexity increases

Engineering Contradiction:

Improveeye position switching convenienceVSAvoidfixing mechanism structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The fixing part uses a rotatable mechanism with engagement structures that allow easy switching between left and right eye positions. The rotation and engagement design provides intuitive operation while maintaining a relatively simple structure compared to fully detachable designs.

Inventive Principle:

Principle #15Dynamics

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

Ensures suitable image display for both left and right eyes without image inversion, allowing easy switching between eye positions and providing additional features like image display stopping or brightness reduction, enhancing user experience.

Implementation Method 1

A head mount display according to an aspect of the invention includes a frame attached to a head of an observer, an image display unit that displays an image to be visually recognized by the observer, a fixing part that fixes the image display unit to the frame, an detection part that detects a signal according to a relative attitude of the image display unit with respect to the frame

Methodology Applied

Scientific EffectMagnetic detection: Magnetism

Implementation Method 2

Methodology Applied

Scientific EffectLight-based detection: Light

Data Source

PatentUS10048502B2Head mount display

Publication Date: 2018.08.14 SEIKO EPSON CORP

AI summary

A head mount display includes a frame attached to a head of an observer, an image display unit that displays an image to be visually recognized by the observer, a fixing part that fixes the image display unit to the frame, an detection part that detects a signal according to a relative attitude of the image display unit with respect to the frame, and a control part that controls the image displayed by the image display unit based on the output signal of the detection part.