Head-Mounted Display Guide Image for Eye Fatigue Reduction

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Solution Overview

Problem

Existing head-mounted display devices cause eye fatigue and discomfort due to the user's line of sight shifting out of the display image screen, leading to distorted vision and a sick feeling, as they rely on a light guide panel with a half mirror portion that requires repeated focusing.

Innovation Solution

A display control unit is implemented to display a guide image that directs the user's line of sight to the center of the display image screen, using techniques such as perspective images, guide lines, frame-like or ring-shaped images, and gradation images to maintain focus within the virtual image area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a light guide panel with a half mirror portion is used to display virtual images, then the user can visually recognize the display image screen, but the user's line of sight shifts out of the display image screen causing eye fatigue and sick feeling

Engineering Contradiction:

Improvevisual recognition stabilityVSAvoideye fatigue and sick feeling

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by displaying a guide image before the user's line of sight shifts out of the display image screen. The guide image is presented in advance to guide the user's line of sight back to the center, preventing the harmful effect of line of sight shifting and repeated focusing that causes eye fatigue and sick feeling

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the user shifts line of sight out of the display image screen, then the user can see the exterior through non-half mirror portions, but the field of vision becomes distorted causing uncomfortable feeling

Engineering Contradiction:

Improveexterior visibilityVSAvoiddistorted vision and uncomfortable feeling

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies feedback by displaying a guide image that provides visual feedback to the user when their line of sight shifts out of the display image screen. The guide image is positioned to guide the user's line of sight back to the center, creating a feedback loop that corrects the distorted vision and uncomfortable feeling while maintaining the ability to see the exterior

Inventive Principle:

Principle #23Feedback

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 effectively restrains the shift of the user's line of sight out of the display image screen, reducing eye fatigue and discomfort by guiding the user's attention to the center, thereby improving visibility and comfort.

Implementation Method 1

the display device is configured to reflect and guide image light to the user's eyes by the half mirror portion, thereby making the user visually recognize a display image screen as a virtual image in the user's field of vision

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS9418581B2Display device, head-mounted display device, display system, and control method for display device

Publication Date: 2016.08.16 SEIKO EPSON CORP

AI summary

A transmission-type head-mounted display device which makes a user visually recognize a display image screen as a virtual image, includes: a display control unit which causes a guide image for guiding the user's line of sight to the center of the display image screen, to be displayed on the display image screen; and a display unit which displays the guide image.