HMD Light Field Vision Correction via Wavefront Mapping
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Solution Overview
Problem
Current solutions for Hyperopia or Myopia users with Head-Mounted Displays (HMDs) fail to provide effective vision correction, leading to poor vision experiences and potential health hazards, as they either compromise comfort, do not fully cover the user group, or require external optical elements like glasses or contact lenses.
Innovation Solution
A method and device that perform three-dimensional reconstruction of images using light field display technology, segmenting the reconstructed light field into focal planes based on wavefront map information to focus images correctly on each eye's retina, allowing users to see VR content clearly without external optical aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If users wear glasses with HMD, then vision correction is achieved, but wearing comfort deteriorates and pressure sensation increases
Solution Approach 1:
The patent merges the HMD optical system with vision correction functionality by integrating a liquid crystal lens array directly into the HMD optical path. This combination eliminates the need for separate glasses, allowing vision correction to occur within the HMD itself, thereby resolving the contradiction between vision correction and wearing comfort
Solution Approach 2:
The liquid crystal lens array acts as an intermediary element between the HMD display and the user's eye. It dynamically adjusts optical power to correct vision defects without requiring physical contact with the eye or additional external elements, thus maintaining comfort while achieving vision correction
2Ease of operation
If mechanical focal length regulation is provided, then myopia users can wear HMD directly, but it cannot meet requirements of high myopia, astigmatism and differences between eyes
Solution Approach 1:
The patent employs a dynamic liquid crystal lens array that can continuously and independently adjust the optical power for each eye in real-time. This dynamic adjustment capability allows the system to adapt to various vision conditions including high myopia, astigmatism, and inter-ocular differences, far exceeding the limited mechanical focal length regulation
Solution Approach 2:
The liquid crystal lens array changes optical parameters (focal length, optical power) dynamically based on user's vision requirements. By controlling the liquid crystal orientation through applied voltage, the system can precisely adjust focal length to correct various vision defects, providing versatile adaptation different from fixed mechanical regulation
3Measurement precision
If contact lenses or surgical correction are required, then optimal VR images are achieved, but health hazards increase
Solution Approach 1:
The patent replaces contact lenses and surgical interventions with an optical system based on liquid crystal lens arrays. This non-invasive optical correction method achieves optimal image quality for VR/AR displays without the health risks associated with contact lenses or surgery, substituting mechanical/biological correction with controllable optical field modulation
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 approach enables Hyperopia or Myopia users to enjoy clear VR experiences under naked eye conditions by providing customized image focusing, addressing the limitations of existing solutions and improving user comfort and safety.
Implementation Method 1
an image output by a display screen is displayed to a user through a self-adjustment liquid crystal... the self-adjustment liquid crystal may change corresponding optical parameters according to a change in at least one input parameter
Implementation Method 2
scanning each eye of a user watching the initial image through a wavefront aberrometer to acquire wavefront map information
Implementation Method 3
performing three-dimensional reconstruction on an initial image to obtain a three-dimensional reconstructed light field by adopting a preset light field display manner
Data Source
AI summary
The disclosure discloses a method and device for controlling display of an image and a Head-Mounted Display (HMD). The method includes: three-dimensional reconstruction is performed on an initial image to obtain a three-dimensional reconstructed light field by adopting a preset light field display manner; the three-dimensional reconstructed light field is segmented, according to wavefront map information, into a plurality of focal planes, wherein the wavefront map information is obtained by scanning each eye of a user watching the initial image through a wavefront aberrometer, and the plurality of focal planes respectively correspond to diopters of different parts of each eye, and are focused on a retina of each eye; and the plurality of focal planes are controlled to be focused on the retina of each eye of the user to display the initial image as an image to be displayed.