Deformable Wire Driver for Multi-Depth Display
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Solution Overview
Problem
Current 3D image display technologies, particularly in VR and AR, suffer from visual fatigue due to Vergence-Accommodation mismatch, which is not adequately addressed in existing depth expression methods.
Innovation Solution
An image display device with a driver mechanism using a deformable wire and an elastic structure to adjust the position of a display element in conjunction with depth information, preventing tilt and allowing for multi-depth expression by changing the distance between the display element and a focusing member, thereby optimizing the virtual image plane position for reduced visual fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stereoscopy technology is used for displaying 3D images, then depth expression capability is improved, but visual fatigue occurs due to Vergence-Accommodation mismatch
Solution Approach 1:
The patent applies dynamics by making the display element position adjustable along the optical axis. The driver mechanism enables the display element to move dynamically to different depths, allowing the virtual image plane position to be adjusted according to depth information, thereby resolving the Vergence-Accommodation mismatch that causes visual fatigue while maintaining 3D depth expression capability
Solution Approach 2:
The patent changes the physical parameter of display element position (distance from focusing member) based on depth information. By adjusting this positional parameter dynamically, the system can express multiple depths and optimize the virtual image plane position for different depth contents, reducing visual fatigue while preserving depth expression
2Adaptability or versatility
If the display element position is adjusted to change distance between display element and focusing member, then multi-depth expression is improved, but tilt of display element may occur
Solution Approach 1:
The patent uses asymmetric placement of elastic structures on opposite sides of the display element to counteract tilt. The first and second elastic structures are positioned asymmetrically relative to the optical axis, creating differential elastic forces that prevent rotational deviation while allowing linear movement along the optical axis, thus maintaining stable orientation during multi-depth expression
Solution Approach 2:
The elastic structures function as counterbalancing elements that resist tilt forces. When the display element moves along the optical axis, any tendency to tilt is counteracted by the elastic restoration forces from the symmetrically arranged elastic structures, maintaining stable orientation while enabling depth adjustment
3Object-affected harmful factors
If a driver mechanism with deformable wire and elastic structure is used to adjust display element position, then visual fatigue is reduced, but device complexity increases
Solution Approach 1:
The patent replaces complex motorized or actuated mechanical systems with a simpler elastic-mechanical system. The deformable wire provides driving force while elastic structures provide passive restoration and tilt prevention, eliminating the need for complex sensors, motors, and control systems while achieving the same functional goals of reducing visual fatigue
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
The solution effectively reduces visual fatigue by enabling precise adjustment of the virtual image plane position based on depth information, enhancing the depth expression capabilities of 3D images and reducing Vergence-Accommodation conflict, leading to a more comfortable and immersive viewing experience.
Implementation Method 1
a first actuator including a deformable wire
Implementation Method 2
an operating structure including an elastic structure configured to prevent tilt with respect to an axis in the first direction
Data Source
AI summary
Provided is an image display device including a display element configured to modulate light to form an image; a light transfer unit configured to transmit the image formed by the display element to eyes of an observer, the light transfer unit comprising a focusing member; and a driver configured to drive the display element to change a position of the display element, the driver including: a first actuator comprising a deformable wire; a housing that fixes a first end and a second end of the deformable wire; and an operating structure through which the deformable wire is routed, wherein the operating structure is configured move the display element in a first direction in conjunction with a length variation of the deformable wire, and the operating structure includes an elastic structure configured to prevent tilt with respect to an axis in the first direction.