Head-Mounted Display Periodic Motion to Reduce Screen Door Effect

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Solution Overview

Problem

Low resolution in head-mounted display devices leads to the screen door effect, affecting the user's visual experience due to non-luminous areas between adjacent pixels.

Innovation Solution

A head-mounted display device with a display, lens group, and actuator that periodically moves on a plane to reduce the impact of non-luminous areas, using a controller to manage the movement and enhance image focus.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the resolution of the display is reduced to decrease pixel size, then the density of pixels increases, but the screen door effect worsens due to non-luminous areas between adjacent pixels

Engineering Contradiction:

Improvepixel densityVSAvoidscreen door effect

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamic movement to the display or lens group through an actuator, causing periodic displacement that blurs the non-luminous areas between pixels. This dynamic approach transforms the static screen door effect into a moving blur that the human visual system perceives as reduced rather than enhanced, effectively masking the harmful non-luminous areas while maintaining high pixel density

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The actuator performs periodic movement of the display or lens group at a frequency that creates a blurring effect on the non-luminous areas. This periodic action is synchronized to occur during the display refresh cycle, creating a temporal averaging effect that reduces the visibility of the screen door effect while maintaining the benefits of high-resolution pixel density

Inventive Principle:

Principle #19Periodic action

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

Effectively minimizes the visual impact of non-luminous areas, reducing the screen door effect by enhancing image clarity and immersion.

Implementation Method 1

The lens group is disposed between the display and a target area and is adapted to focus the image light beam to form a display image in the target area

Methodology Applied

Scientific EffectOptical focusing: Lens

Implementation Method 2

The actuator is coupled to the display or the lens group to periodically move the display or the lens group on a plane

Methodology Applied

Scientific EffectPeriodic mechanical movement: Vibration

Data Source

PatentUS12366719B2Head-mounted display device and display method therefor

Publication Date: 2025.07.22 HTC CORP

AI summary

A head-mounted display device includes a display, a lens group and an actuator. The display is used for generating an image light beam. The lens group is disposed between the display and a target area and is adapted to focus the image light beam to form a display image in the target area. The actuator is coupled to the display or the lens group to periodically move the display or the lens group on a plane.