Head-Mounted Display Relay Optical System for Weight Distribution
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Solution Overview
Problem
Conventional head-mounted display devices face issues with weight distribution, reduced peripheral visual fields, and discomfort due to heavy components and obstructed views, leading to reduced safety and usability.
Innovation Solution
A head-mounted display device incorporating an image display unit, a light guide member, and a relay optical system that relays image light to form intermediate images, allowing for a larger screen size and improved weight distribution, thereby enhancing peripheral vision and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If image display devices, collimator lenses, mirrors, and light guide members are integrated with center of gravity located anterior to eyeballs, then large screen display with wide viewing angle is achieved, but load application to nose becomes large causing inflammation or pain
Solution Approach 1:
The patent divides the optical system into separate functional modules: image display devices are positioned posterior to the eyeballs, while light guide members with exit ports are positioned anteriorly. This segmentation allows the heavy display components to be located away from the nose while still providing wide viewing angle through the light guide system.
Solution Approach 2:
The light guide member acts as an intermediary between the posteriorly positioned image display devices and the anterior exit ports. It transmits light from the display elements located away from the nose to the front surface where it exits to the user's eye, enabling separated positioning of heavy components and light exit points.
2Area of stationary object
If integrated structure with anterior center of gravity is used, then wide viewing angle is achieved, but left and right peripheral visual fields are blocked reducing visual field to 100 degrees or smaller
Solution Approach 1:
The patent utilizes the depth dimension by positioning image display devices at different locations relative to the eyeballs (posterior positioning) while maintaining anterior exit ports. This three-dimensional arrangement allows light to reach the eye from the rear, opening up the peripheral visual fields that would otherwise be blocked by front-mounted displays.
3Area of stationary object
If two left and right image display devices, driving circuits, and optical systems are arranged in front of eyes, then large screen display with viewing angle of 90 degrees or larger is achieved, but total weight reaches 500 grams or larger making it difficult to wear for long time
Solution Approach 1:
The patent extracts the heavy image display devices from the front-mounted configuration and relocates them to posterior positions behind the eyeballs. Only the lighter light guide members and their exit ports remain at the front, significantly reducing the weight concentrated at the nose and making the device wearable for extended periods.
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 solution improves screen size, reduces nose load, and secures left and right peripheral visual fields, enhancing user safety and comfort during extended wear.
Implementation Method 1
The relay optical system is arranged between the image display unit and the light guide member, and configured to relay the image light from the image display unit to the light guide member, and form an intermediate image at least once before the image light enters the light guide member
Implementation Method 2
The light guide member is configured to guide the image light and emit the image light to eyes of a wearer
Data Source
AI summary
A head-mounted display device includes an image display unit (300a, 300b) configured to emit image light, a light guide member (100a, 100b) configured to guide the image light and emit the image light to eyes of a wearer who wears the head-mounted display device, and a relay optical system (201a, 201b) arranged between the image display unit and the light guide member, and configured to relay the image light from the image display unit to the light guide member, and form an intermediate image at least once before the image light enters the light guide member.