See-through Head Mounted Display Motion Sickness Evaluation
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Solution Overview
Problem
There is a lack of effective evaluation methods for the risk of motion sickness and photosensitive epilepsy in see-through type head-mounted displays, which are used for augmented reality, as existing techniques do not adequately assess the biological impact of combined external and displayed imagery on users.
Innovation Solution
A head-mounted display system that includes a processing unit to synthesize and evaluate the biological effects of external and displayed imagery using sensors like cameras or distance sensors, providing accurate assessments and notifications to users, and potentially reducing image size or offloading evaluation to a server to mitigate adverse effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion sickness evaluation is performed on traditional display devices, then motion sickness risk can be assessed, but the evaluation does not account for the combined effect of external world viewing and displayed imagery in see-through type head mounted displays
Solution Approach 1:
The evaluation method transitions from static display-only assessment to dynamic synthesis combining external sensor data with displayed imagery. The processing unit dynamically synthesizes moving images from the display device with external light images captured by sensors, creating a composite representation of what the user actually perceives when wearing the see-through type display.
Solution Approach 2:
A processing unit acts as an intermediary to bridge the gap between traditional display evaluation and see-through display reality. It synthesizes the displayed imagery with external environment data, and introduces a biological effect evaluation unit that assesses the combined impact on users, providing adapted evaluation for this novel display paradigm.
2Measurement precision
If synthesized moving image is used for biological effect evaluation, then evaluation accuracy is improved, but system complexity increases due to image synthesis requirements
Solution Approach 1:
The processing unit performs multiple functions: it synthesizes moving images from the display device, captures external light images through sensors, and feeds both to the biological effect evaluation unit. This multi-functional approach consolidates what could be separate complex systems into a unified evaluation platform.
Solution Approach 2:
Instead of requiring complex optical setups to capture actual user viewing conditions, the system creates a digital copy of the external environment through sensors and synthesizes it with the displayed imagery. This computational copying approach simplifies the physical system while maintaining evaluation accuracy.
3Manufacturing precision
If camera calibration based on camera characteristics is performed, then synthesis accuracy is improved, but processing time and computational load increase
Solution Approach 1:
The system performs camera calibration in advance by acquiring camera characteristics before actual image synthesis. This preliminary calibration establishes reference data that can be reused, reducing the computational burden during real-time operation while maintaining high synthesis accuracy.
4Object-affected harmful factors
If moving image size is reduced to mitigate biological effects, then user safety is improved, but display quality and viewing experience deteriorate
Solution Approach 1:
The biological effect evaluation unit continuously assesses the synthesized moving image and provides feedback to the display control. Based on this evaluation, the system can dynamically adjust display parameters such as image size, brightness, or content selection to minimize biological effects while preserving acceptable display quality. This feedback loop enables adaptive optimization rather than static compromise.
Data Source
AI summary
A head mounted display includes a display unit capable of transparently displaying an outside world. The head mounted display includes a processing unit that displays a moving image on the display unit; and an external sensor that detects movement in the outside world which can be transparently displayed by the display unit. The processing unit acquires the movement in the outside world obtained by the external sensor, synthesizes the acquired movement in the outside world and the moving image to be displayed, and evaluates a biological effect based on the synthesized moving image obtained by the synthesis.