Movable Optical Element for IPD Adjustment in AR Displays
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Solution Overview
Problem
Conventional see-through display devices for VR, AR, and MR struggle to accommodate varying inter-pupillary distances (IPD), leading to difficulties in securing a wide Eye Motion Box and ensuring clear image visibility for users with IPDs outside the standard range.
Innovation Solution
An electronic device with a display unit comprising lenses and optical elements that can adjust the position of the optical elements based on the user's pupil distance, using sensors to detect pupil position and adjust the image transfer unit accordingly, and employing refractive members to compensate for differences in image distance, allowing for clear image viewing across a range of IPDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pin-mirror optical element is used in the display unit, then the device structure is simplified and manufacturing is easier, but the Eye Motion Box (EMB) width is limited and IPD adjustment range is restricted
Solution Approach 1:
The patent applies the dynamics principle by making the optical element movable rather than fixed. The optical element can be positioned at multiple locations along the optical path, allowing dynamic adjustment of the light path length and IPD range. This enables the device to adapt to different user IPD measurements while maintaining a compact structure using the pin-mirror optical element.
Solution Approach 2:
The patent segments the optical path into multiple adjustable sections. By dividing the optical path and allowing independent adjustment of the optical element's position within this segmented structure, the system achieves extended IPD adjustment range without requiring a complete redesign of the pin-mirror optical element structure.
2Manufacturing precision
If the optical path is fixed in the manufacturing process, then manufacturing precision is improved, but adaptability to different user IPD is reduced
Solution Approach 1:
The patent resolves this contradiction by introducing a movable optical element that can be dynamically repositioned after manufacturing. The fixed manufacturing process ensures precision in the base structure, while the adjustable optical element provides post-manufacturing adaptability to different user IPD measurements, combining manufacturing precision with user-specific customization.
Solution Approach 2:
The patent changes the positional parameter of the optical element to adapt to different IPD requirements. By allowing the optical element's position to vary along the optical path, the system maintains the precision of the fixed manufacturing process while enabling parameter adjustment to suit individual user needs.
3Device complexity
If the optical element position is fixed, then device complexity is reduced, but image clarity for users with non-standard IPD deteriorates
Solution Approach 1:
The patent applies dynamics by implementing a movable optical element that can be repositioned based on the user's IPD measurement. This dynamic adjustment capability ensures that users with non-standard IPD can achieve clear images without significantly increasing device complexity, as the adjustment mechanism builds upon the existing pin-mirror optical element structure.
Solution Approach 2:
The patent incorporates feedback by measuring the user's IPD and using this information to determine the appropriate position for the optical element. This feedback loop ensures that the optical element is positioned optimally for each user, guaranteeing image clarity while maintaining relatively simple device architecture through automated adjustment.
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
Enables clear image viewing for users with both narrow and wide IPDs by dynamically adjusting the optical elements and refractive power, overcoming structural limitations and ensuring a wide range of IPD compatibility.
Implementation Method 1
an optical element provided in the lens to transfer an image toward an eyeball of a user
Implementation Method 2
employing refractive members to compensate for differences in image distance
Data Source
AI summary
Disclosed is an electronic device. The electronic device according to the present disclosure comprises a display provided at a position corresponding to at least one of the left and right eyes of a user, the display including a lens and an optical element provided in the lens to transfer an image toward an eyeball of a user, and an image transfer for transferring an image provided from a processor to the optical element, wherein the image transfer is capable of varying the position of the optical element to which the image is transferred based on pupil position of the user. The electronic device according to the present disclosure is associated with an artificial intelligence (AI) module, an augmented reality (AR) device, a virtual reality (VR) device, a device related to 5G services and the like.