Movable 3D Display Timing for Convergence-Accommodation Alignment

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Solution Overview

Problem

Existing display devices cause convergence/accommodation contradiction, leading to eye fatigue and 3D sickness due to misalignment between focal and convergence positions during stereoscopic image display.

Innovation Solution

A display device with a movable display unit and controlled emission timing based on its position, adjusting the angular aperture of light emission to align with the stereoscopic image depth, reducing the convergence/accommodation contradiction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a microlens array is disposed in between a display and an optical system to enable stereoscopic image display, then the stereoscopic viewing capability is improved, but convergence/accommodation contradiction occurs leading to eye fatigue and 3D sickness

Engineering Contradiction:

Improvestereoscopic viewing capabilityVSAvoideye fatigue and 3D sickness

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The display unit is made movable along the optical axis direction, allowing dynamic adjustment of the display position. This enables the focal position to be shifted to match the convergence position of the stereoscopic image, thereby resolving the convergence/accommodation contradiction that causes eye fatigue and 3D sickness while maintaining stereoscopic viewing capability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the physical parameter of display position by moving the display unit along the optical axis. This parameter change allows the focal position to be dynamically adjusted to coincide with the convergence position, eliminating the harmful effects of convergence/accommodation mismatch while preserving the stereoscopic image display function

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the display unit is moved to adjust focal position, then convergence/accommodation alignment is improved, but device complexity increases

Engineering Contradiction:

Improveconvergence/accommodation alignmentVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The movable display unit serves multiple functions: it maintains the stereoscopic image display capability while simultaneously enabling focal position adjustment for convergence/accommodation alignment. This multi-functionality resolves the contradiction by achieving reliability improvement without proportionally increasing device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the display function with the focal adjustment function into a single movable display unit. By combining these functions, the system achieves convergence/accommodation alignment without requiring separate complex adjustment mechanisms, thereby limiting the increase in device complexity

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12574494B2Display device, display control method, and computer-readable storage medium

Publication Date: 2026.03.10 JVC KENWOOD CORP

AI summary

A display device includes a display unit including a plurality of pixels to cause the pixels to emit light to provide an image to a user; a drive control unit configured to move the display unit at predetermined intervals; and a timing setting unit configured to set an emission timing of the light for each of the pixels based on a position of the display unit.