Head-Mounted Display Optics With Refractive Eye Illumination
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Solution Overview
Problem
Existing head-mounted display devices face challenges in efficiently directing light to the user's eye while also capturing images, leading to potential distortion and reduced image quality.
Innovation Solution
Incorporating a refractive element between the light emitting unit and the lens to refract light in a specific direction, combined with a camera to capture images based on a specified wavelength band, ensuring clear and undistorted light transmission and image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light emitting unit is disposed close to the lens to improve light transmission efficiency, then light transmission efficiency is improved, but image distortion increases and image quality deteriorates
Solution Approach 1:
A refractive element is introduced as an intermediary component between the light emitting unit and the lens. This refractive element refracts light emitted from the light emitting unit in a direction toward the optical axis, enabling the light emitting unit to be positioned closer to the lens while preventing image distortion and maintaining image quality.
2Device complexity
If the light emitting unit is positioned parallel to the optical axis to simplify structure, then device complexity is reduced, but light transmission efficiency decreases
Solution Approach 1:
The refractive element serves as a mediator that enables the light emitting unit to emit light in a direction parallel to the optical axis while still achieving efficient light transmission. The refractive element redirects the light toward the optical axis, maintaining both structural simplicity and high light transmission efficiency.
3Device complexity
If no refractive element is used to reduce device complexity, then device complexity is reduced, but light transmission efficiency and image clarity are compromised
Solution Approach 1:
The refractive element is introduced as a compact intermediary component that significantly improves light transmission efficiency and image clarity without substantially increasing device complexity. The element is disposed between the light emitting unit and the lens, and its refractive function enables efficient light direction control.
Solution Approach 2:
The refractive element changes the direction parameter of light propagation by refracting light from the light emitting unit toward the optical axis. This parameter change enables improved light transmission efficiency and image quality while maintaining a compact device 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
Enhances light transmission efficiency and image clarity, providing improved augmented and virtual reality experiences by optimizing light refraction and image acquisition.
Implementation Method 1
a refractive element comprising a refractive material disposed between the at least one lens and the light emitting unit and refracting the first light emitted from the light emitting unit in a second direction different from the first direction
Implementation Method 2
at least one lens disposed so that light emitted from the display is transmitted to output to the outside of the head mounted device
Implementation Method 3
a camera disposed in the space and obtaining an image, based on second light including light of the specified wavelength band
Data Source
AI summary
A head mounted device according to various embodiments may include: a housing, a display disposed inside the housing, at least one lens including a front side and a rear side opposite the front side, the at least one lens being configured so that a user wearing the head mounted device is able to see the display through the at least one lens, a light emitting unit comprising light emitting circuitry disposed to the front side of the at least one lens and configured to emit light in a first direction, a camera disposed to the front side of the at least one lens and configured to obtain an image of at least part of an eyeball of the user, and a refractive element comprising a refractive material disposed between the at least one lens and the light emitting unit. The light emitted from the light emitting unit may be refracted by the refractive element in a second direction facing the eyeball of the user.