Optical See-Through Display Control for Dynamic Virtual Focus
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Solution Overview
Problem
Existing optical see-through type head-mounted display apparatuses suffer from significant blurring of virtual objects when viewing real objects at varying distances, particularly in wide depth ranges.
Innovation Solution
A control device that acquires line-of-sight information to detect the real object being viewed and adjusts the imaging distance of virtual objects based on the detected distance, using processors and circuitry to optimize focus and reduce blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the imaging distance of virtual objects is fixed in optical see-through type head-mounted display apparatuses, then the device structure is simple, but the virtual objects appear blurred when viewing real objects at varying distances
Solution Approach 1:
The patent implements dynamic adjustment of the imaging distance for virtual objects based on the detected distance to real objects. The control device changes the imaging distance in accordance with the distance to the gazed real object, making the focus position adaptable rather than fixed. This resolves the contradiction by allowing the system to maintain sharp focus across varying depths without requiring complex mechanical adjustments, as the adjustment is performed through optical path control.
Solution Approach 2:
The patent employs a feedback mechanism where the control device acquires line-of-sight information, detects the distance to the real object being viewed, and uses this information to adjust the imaging distance of virtual objects. This closed-loop feedback system ensures that virtual objects remain in focus regardless of the user's viewing distance, resolving the technical contradiction between maintaining focus precision and avoiding excessive system complexity.
2Manufacturing precision
If the imaging distance is adjusted to match the distance to the gazed real object, then virtual objects remain clear at any depth, but the control system becomes more complex
Solution Approach 1:
The patent introduces a control device as an intermediary that mediates between the user's line-of-sight input and the optical system's imaging distance adjustment. This intermediary component processes line-of-sight information, determines the distance to the gazed real object, and accordingly adjusts the imaging distance of virtual objects. By using this intermediary control mechanism, the system achieves precise focus adjustment without requiring direct mechanical coupling between all components, thereby managing complexity effectively.
3Manufacturing precision
If a fixed imaging distance is used in the middle of the depth range, then focus is maintained for objects at that specific depth, but virtual objects become blurred when viewing objects at the front or back of the depth range
Solution Approach 1:
The patent transforms the static imaging distance setting into a dynamic one that adapts to the user's viewing needs. Instead of fixing the imaging distance at the middle of the depth range, the system continuously adjusts the imaging distance based on the detected distance to the real object being viewed. This dynamic adjustment enables the system to maintain focus precision across the entire depth range, from front to back objects, thereby resolving the contradiction between optimized focus at a specific depth and adaptability to different viewing distances.
Data Source
AI summary
A control device according to the present invention is a control device configured to control an optical see-through type display apparatus, the control device including one or more processors and/or circuitry configured to execute acquisition processing of acquiring line-of-sight information of a user, a detection processing of detecting a real object that the user is viewing on a basis of the line-of-sight information, and a control processing of performing control to adjust an imaging distance of a virtual object according to a distance between the display apparatus and the detected real object.