Visual Depth Calibration for Head-Wearable Displays
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Solution Overview
Problem
Existing augmented reality (AR) and mixed reality (MR) systems struggle to accurately superimpose binocular virtual images onto real objects due to mismatched depth perception and interpupillary distance (IPD) variations.
Innovation Solution
A visual depth calibration system that adjusts the emission angles of collimated light signals for each eye based on measured interpupillary distances (IPD) and convergence angles, ensuring accurate depth perception and superimposition of virtual images onto real objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveguide-based AR displays render virtual images with various depths, then the display capability is improved, but the distance of the display screen from the viewer's eyes does not match the depth perception of the virtual image, causing inaccurate superposition
Solution Approach 1:
The system dynamically adjusts the optical convergence angle of light signals emitted to each eye based on the desired virtual image depth. By changing the parameter of light emission angle according to depth requirements, the system achieves accurate depth perception while maintaining a fixed display screen distance from the viewer's eyes.
Solution Approach 2:
The patent implements dynamic adjustment of interpupillary distance (IPD) parameters based on the viewer's actual measurements and real-time depth requirements. The system adapts the optical path and convergence angle dynamically, allowing the virtual image depth to be accurately controlled without requiring physical adjustment of the display screen distance.
2Device complexity
If retina scanning based AR devices use fixed depth rendering methods, then the device complexity is reduced, but the superposition between virtual images and real objects cannot be accurately achieved
Solution Approach 1:
The system incorporates feedback mechanisms where the actual depth perception is measured and compared with the intended depth. Based on this feedback, the optical convergence angle and IPD parameters are adjusted to achieve accurate superposition of virtual images with real objects, maintaining precision without excessive system complexity.
Solution Approach 2:
The system performs preliminary calibration of the viewer's interpupillary distance (IPD) and establishes baseline optical parameters before actual use. This preliminary setup enables accurate depth rendering without requiring complex real-time adjustments during operation, balancing precision with system simplicity.
3Device complexity
If the screen distance is fixed for displaying binocular virtual images, then the device structure is simplified, but the depth perception of the virtual image does not match the actual depth, causing focal rivalry and vergence accommodation conflict
Solution Approach 1:
The patent replaces mechanical adjustment of display screen distance with optical control of light convergence angle. Instead of physically moving the screen to match virtual image depth, the system uses optical methods to control the apparent depth perception, maintaining a fixed screen position while achieving accurate depth rendering and eliminating focal rivalry.
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 system achieves accurate depth perception and superimposition of virtual images onto real objects, overcoming focal rivalry and vergence accommodation conflict, and providing a personalized and realistic 3D effect for individual users.
Implementation Method 1
The emitters may use laser as light source. In one embodiment, the first and second emitters are laser beam scanning emitters
Implementation Method 2
The first light direction modifier and second light direction modifier may respectively be a two dimensional (2D) adjustable reflector
Implementation Method 3
the head wearable display may further comprise a first combiner and a second combiner for reflecting the light from the first light direction modifier and second light direction modifier to the first and second eye of the viewer
Data Source
AI summary
The present disclosure relates to a visual depth calibration system for accurately rendering visual depth perception of a virtual image in head wearable display, comprising a first distance measurement unit for determining a first distance between a first real object and a viewer, and a second distance between a second real object and the viewer; a first light direction modifier and a second light direction modifier for respectively and changing a direction of a first collimated light signal and a second collimated light signal emitted by a first emitter and a second emitter such that the first collimated light signal and the second collimated light signal are respectively emitted toward a first eye and a second eye with a first angle and a second angle that are altering relative a frontal plane of the viewer to render a binocular virtual image having variable depth perception for the viewer.