HMD Image Light Region Alignment for Motion Sickness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted display devices fail to effectively suppress visually induced motion sickness when the user moves, especially when the device does not tilt with respect to the horizontal plane, and they also compromise visibility of the outside scene while attempting to mitigate this issue.
Innovation Solution
A head-mounted display device with an image display unit, a specific-direction setting unit, and a control unit that aligns the image light generation region with the outside scene, adjusts image light based on the distance and positional relation to the specific target, and optimizes luminance and color to improve visibility and reduce motion sickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the peripheral section of the video is made to emit light to suppress visually induced motion sickness, then motion sickness is suppressed, but visibility of the outside scene in the light emitting region becomes difficult
Solution Approach 1:
The patent applies local quality by making different regions of the display have different luminance characteristics. Specifically, the luminance of each pixel is adjusted based on its position relative to the image light generation region. Regions closer to the image light generation region (which corresponds to the outside scene view) have lower luminance to maintain visibility, while other regions can have higher luminance to suppress motion sickness. This spatially varying luminance distribution resolves the contradiction between suppressing motion sickness and maintaining outside scene visibility.
2Device complexity
If video correction is applied only when the head mounted display device tilts with respect to the horizontal plane, then device complexity is reduced, but motion sickness suppression is insufficient when the user moves without tilting
Solution Approach 1:
The patent applies dynamics by continuously adjusting the luminance distribution according to the user's movement state rather than applying fixed correction only under specific conditions. The system dynamically determines the luminance of each pixel based on real-time detection of user movement and the corresponding image light generation region. This continuous adaptation ensures motion sickness suppression works effectively whether the user is tilting, walking, or moving in other ways, without requiring complex conditional logic.
3Object-affected harmful factors
If the image light generation region is aligned with the outside scene, then motion sickness is suppressed and outside scene visibility is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies universality by designing the control unit to perform multiple functions: it detects user movement, determines the image light generation region based on movement state, calculates appropriate luminance values for each pixel, and outputs the adjusted video signal. By consolidating these functions into a single control unit that handles both motion sickness suppression and outside scene visibility optimization through unified luminance adjustment, the patent reduces overall device complexity despite the sophisticated control requirements.
Data Source
AI summary
A transmission type head mounted display device includes an image display unit including an image-light generating unit configured to generate image light on the basis of image data and emit the image light, the image display unit causing a user to visually recognize the image light as a virtual image and transmitting an outside scene in a state, a display-unit-direction specifying unit configured to specify a display unit direction, which is a direction of the image display unit, a specific-direction setting unit configured to set a specific direction on the basis of an image light generation region where the image-light generating unit generates the image light and the display unit direction, and a control unit configured to set a position of the image light generation region on the basis of the display unit direction.