Head-Mounted Display Mounting Deviation Sensor
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Solution Overview
Problem
Existing head-mounted display apparatuses face challenges in accurately measuring mounting deviation due to human biological changes and individual differences, such as pupil size variations, hair, eyelashes, and blinking, which affect the precision of image projection onto the eyeball.
Innovation Solution
Incorporating a sensor that detects changes in the position of the head-mounted display apparatus relative to the head, allowing for accurate adjustment of the image projection position, independent of detecting the eyeball's reference axis, and using contact or non-contact methods to determine the positional change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If image projection is adjusted based on eyeball image information, then line-of-sight tracking is improved, but measurement precision deteriorates due to biological changes and individual differences
Solution Approach 1:
The patent introduces an intermediary sensor system that detects mounting deviation through physical signals (acceleration, angular velocity, contact pressure) rather than directly imaging the eyeball. This mediator bypasses the problematic biological variables while still enabling accurate line-of-sight tracking by providing independent mounting deviation data that complements the eyeball image information.
Solution Approach 2:
The patent replaces the purely optical/mechanical eyeball imaging system with a sensor-based detection system that uses physical principles (inertial measurement, pressure sensing) to detect mounting deviation. This substitution eliminates dependence on optical conditions and biological variability, achieving more reliable and precise measurements.
2Ease of operation
If head-mounted display apparatus weight is increased to include line-of-sight detection mechanism, then line-of-sight following capability is improved, but mounting stability deteriorates
Solution Approach 1:
The patent implements a feedback loop where sensors continuously monitor mounting deviation caused by head movements, and the system automatically compensates by adjusting the projection position. This real-time feedback mechanism allows the heavy apparatus to maintain stable image projection despite mounting shifts, effectively counteracting the destabilizing effect of its own weight.
3Manufacturing precision
If pupil diameter is small in bright location, then retinal direct drawing precision is improved, but measurement difficulty increases
Solution Approach 1:
The patent merges multiple detection approaches (sensor-based mounting deviation detection with eyeball image analysis) to compensate for the difficulty of detecting small pupil positions. The sensor data provides a reference framework that enhances the accuracy of pupil position detection even when the pupil is small, combining the strengths of both methods.
Data Source
AI summary
An object is to provide a head-mounted display apparatus that makes it possible to accurately determine a mounting deviation. The technology provides a head-mounted display apparatus including a sensor that detects a change in position of the head-mounted display apparatus relative to a head. The technology further provides an image display system including the head-mounted display apparatus and an information processor that sends image data to the head-mounted display apparatus. The technology further provides an image display method including a detection step of detecting the change in position of the head-mounted display apparatus relative to the head, and an adjustment step of adjusting a position to which the head-mounted display apparatus projects image display light on the basis of the change in position detected in the detection step.