HMD Light Guide with Ambient and Focus Modulation
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Solution Overview
Problem
Head-mounted display (HMD) apparatuses with augmented reality technology face challenges in maintaining visual balance and comfort, especially in varying light environments, and conventional vision correction eyeglasses can hinder their use when the distance between the lens and the eyes is minimized.
Innovation Solution
The HMD apparatus incorporates an image source, a light guiding element, a first modulating element to adjust ambient beam transmittance, and a second modulating element to adjust the focus position of the image beam, allowing for total internal reflection and emission to the user's eye without additional eyeglasses, optimizing center of gravity and comfort while adapting to different light intensities and vision needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distance between the lens and the eyes is minimized to optimize center of gravity and wearing comfort, then the center of gravity is optimized and wearing comfort is improved, but conventional vision correction eyeglasses cannot be used additionally
Solution Approach 1:
The patent combines the vision correction function and the HMD display function into a single integrated lens structure. The light guiding element incorporates both the optical path for the displayed image and the optical correction path, eliminating the need for separate vision correction eyeglasses while maintaining wearing comfort.
Solution Approach 2:
The lens of the HMD apparatus is designed to perform multiple functions simultaneously: it serves as both the display optical element and the vision correction element. This multi-functional design allows the device to accommodate users with different vision requirements without requiring additional eyeglasses.
2Illumination intensity
If the HMD apparatus is required to modulate light intensity of the real world in brighter environments, then visual balance is achieved, but the device complexity increases
Solution Approach 1:
The patent combines the light intensity modulation function with the existing optical elements in the HMD apparatus. The modulating element is integrated into the optical path, allowing it to control ambient light intensity without requiring separate complex modulation systems.
Solution Approach 2:
The modulating element serves multiple purposes: it controls the light intensity of the real world environment, works in conjunction with the light guiding element for image display, and can be integrated with the vision correction function. This multi-functionality reduces overall device complexity despite adding light modulation capability.
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
This configuration enables good display effects in varying light conditions without the need for additional eyeglasses, optimizing user comfort and visual balance by modulating ambient light intensity and focus position, thus enhancing wearing comfort and optical performance.
Implementation Method 1
The image beam undergoes a total internal reflection at the first surface, and the image beam is emitted from the second surface
Data Source
AI summary
An HMD apparatus includes an image source, a light guiding element, a first modulating element, and a second modulating element. The image source provides an image beam. The light guiding element is arranged on a transmission path of the image beam to transmit the image beam. The light guiding element has a first surface and a second surface opposite to each other. The image beam undergoes total internal reflection at the first surface and is emitted from the second surface. The first modulating element is arranged on one side of the first surface of the light guiding element and configured to adjust a transmittance of an ambient beam. The light guiding element is arranged between the first and second modulating elements, and the second modulating element is configured to adjust a focus position of the image beam. The HMD apparatus may improve wearing comfort and achieve good display effects.