Virtual Image Display Adjusting Visual Line Angle
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Solution Overview
Problem
Virtual image display apparatuses like head-mounted displays (HMDs) face challenges in reducing eye burden and stress during long-term use due to the difficulty in adjusting the observer's posture to direct the visual line downward, which is exacerbated by individual differences in eye, nose, and ear positions.
Innovation Solution
A virtual image display apparatus with a light guide member and an adjusting section that adjusts the emission state of light to direct the visual line downward, using a support position reference plane and adjustable components such as nose receiving sections and temple sections to accommodate individual differences, allowing for a suitable visual line angle without causing discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the virtual image display apparatus is designed with a fixed support position reference plane assuming standard eye position, then the apparatus can be simplified in structure and manufacturing, but it cannot accommodate individual differences in eye, nose, and ear positions, causing the visual line to not be directed downward as intended
Solution Approach 1:
The patent introduces adjustable components (nose receiving section and temple section) that allow the support position reference plane to be dynamically adjusted to accommodate individual differences in eye, nose, and ear positions. This transforms the fixed structure into an adaptable one, enabling the visual line to be directed downward correctly for each user without requiring completely different designs for each individual.
Solution Approach 2:
The patent allows adjustment of the support position reference plane parameters (position and orientation) to match individual user anatomy. By changing these geometric parameters through the adjustable components, the system adapts to different users while maintaining the same basic apparatus design, thus resolving the contradiction between structural simplicity and adaptability.
2Ease of operation
If the observer looks straight forward at the video displayed by the HMD, then the apparatus can be worn in a standard position, but the observer experiences eye burden and stress due to fatigue from maintaining the eyes in a wide-open state
Solution Approach 1:
The patent pre-configures the light guide member to emit light from a direction angled with respect to the support position reference plane, so that when the apparatus is properly adjusted and worn, the observer naturally views the video from an overlooking direction with the visual line directed downward. This preliminary angular configuration ensures that the relaxed eye state (visual line directed downward) coincides with the natural viewing direction of the displayed video, eliminating eye burden before the observer even begins watching.
3Object-affected harmful factors
If the light guide member emits light from a direction angled with respect to the support position reference plane to direct the visual line downward, then the eye burden is reduced, but the apparatus requires an adjusting section to accommodate individual differences, increasing device complexity
Solution Approach 1:
The patent divides the adjustment function into separate, modular components: the nose receiving section and the temple section. Each component can be independently adjusted to accommodate individual differences in anatomy. This segmentation allows the system to achieve the necessary angular adjustment to direct the visual line downward and reduce eye burden, while keeping each individual component relatively simple in structure.
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
The apparatus effectively reduces eye burden and stress during long-term use by ensuring the visual line is directed downward, even with deviations in eye, nose, and ear positions, optimizing the viewing experience through adjustable components.
Implementation Method 1
a light guide member arranged in front of the eye of an observer and configured to direct light emitted from the video device to the eye of the observer
Implementation Method 2
The adjusting section changes an angle in the overlooking direction with respect to the position of the eye of the observer by adjusting an emission state of the light from the light guide member
Data Source
AI summary
An observer can observe a video in a state in which the visual line of the observer is caused to overlook the downward side. In particular, in a virtual image display apparatus, even when the positions of the eyes, the nose, and the ears of the observer deviate from standard positions and the observer cannot observe a video in a targeted overlooking direction in a worn state in standard setting, it is possible to change an angle in an overlooking direction with respect to a front direction and cause the observer to perform observation in a suitable visual line by changing, with a nose receiving section functioning as an adjusting section, the posture of the virtual image display apparatus and adjusting an emission state of video light from a light guide member according to individual differences of the observer.