Head Mounted Display Lenses with Biased Optical Centers
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Solution Overview
Problem
Head-mounted displays (HMDs) face challenges in providing a wide field of view without image overlap for virtual reality and mixed reality applications, as traditional lens designs with optical centers aligned with physical centers limit the angular field of view and cause image overlap when increased.
Innovation Solution
The design features lenses with optical centers biased away from their physical centers, allowing for a larger angular field of view by relocating the lens centers and using Fresnel lenses with rectangular shapes, which maintains non-overlapping images for both eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional lenses with optical centers aligned with physical centers are used, then the device structure is simple, but the field of view is limited and image overlap occurs when the field of view is increased
Solution Approach 1:
The patent applies asymmetry by biasing the optical centers of the lenses away from their physical centers. This asymmetric configuration allows the lenses to provide a wider field of view without causing image overlap, as the optical path is deliberately offset from the geometric center of the lens structure.
2Area of stationary object
If the angular field of view is increased to enhance immersion, then user immersion is improved, but image overlap occurs between the two eyes
Solution Approach 1:
By asymmetrically positioning the optical centers relative to the physical centers of the lenses, the system achieves a wider angular field of view while maintaining proper image separation for stereoscopic viewing. The offset configuration ensures that each eye receives the appropriate visual information without overlap.
3Reliability
If the display screen is held close to the eyes to improve virtual reality quality, then the virtual reality experience is enhanced, but image distortion and overlap occur
Solution Approach 1:
The patent introduces reflecting surfaces as intermediary elements between the display screen and the lenses. These reflectors redirect light paths, allowing the display to be positioned closer to the eyes while maintaining proper image formation and avoiding distortion through the optical system.
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 solution increases the field of view to approximately 106.9 degrees horizontally and 53 degrees vertically, enhancing user immersion while maintaining comfort by providing sufficient eye relief distance and preventing image overlap, thus improving the overall virtual reality experience.
Implementation Method 1
The light emitted from the display screen is reflected by the first reflecting surface to the pair of lenses
Implementation Method 2
which focuses the light as it passes through the lenses to the second reflecting surface
Implementation Method 3
using Fresnel lenses with rectangular shapes
Implementation Method 4
which reflects the focused light to the eyes of the user through the eyeholes
Data Source
AI summary
A head mounted display for a user that uses a display screen to produce images. The head mounted display includes a frame. The frame has a pair of lenses. The pair of lenses has their optical centers biased away from their physical centers. The head mounted display includes a strap which attaches to the frame and fits about the user's head to hold the frame to the user's head. A method for viewing images by a user.