Pin-Mirror Optical Alignment for Compact AR-VR Displays
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Solution Overview
Problem
Existing VR and AR glasses face challenges in integrating a see-through display and camera within a compact form due to separate optical systems, leading to increased weight and complexity, with heterogeneity in optical axes requiring software correction.
Innovation Solution
An electronic device with a reflection unit, comprising a pin-mirror configuration where the first and second surfaces are arranged back-to-back with optical glue in between, and mirrors with specific curvatures to align the camera's optical axis with the user's view axis, allowing for a miniaturized and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate optical systems are used for see-through display and camera, then each component can be optimized independently, but the device size, volume, and weight increase
Solution Approach 1:
The patent combines the see-through display and camera into a single integrated optical system. The display unit and photographing unit share common optical elements and a unified optical path, eliminating the need for separate optical systems. This merging reduces the overall device volume while maintaining the functional performance of both the display and camera components.
2Measurement precision
If multiple camera lenses are disposed in a protruding state to implement stereo depth camera, then depth sensing capability is improved, but the device size and weight increase
Solution Approach 1:
The patent nests the photographing unit within the display structure by integrating the camera lens array into the display unit. The lenses are arranged in a compact configuration where multiple lens elements are nested within the display housing, eliminating the need for protruding camera modules. This nesting approach maintains stereo depth sensing capability while reducing device length.
3Loss of information
If optical axes of display and camera are aligned, then software correction for heterogeneity is reduced, but the structural design becomes more complex
Solution Approach 1:
The patent implements a universal optical path that serves both the display and photographing functions. The same optical elements and light path are used for both displaying images and capturing images, ensuring that the optical axes are inherently aligned. This multi-functional design eliminates the need for separate optical paths and reduces software correction requirements without significantly increasing structural complexity.
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 improves image quality by aligning optical axes, reducing weight and size, and minimizing software correction needs, while maintaining the see-through functionality without obstructing the user's view.
Implementation Method 1
a reflection unit formed in the display, in which the reflection unit includes a first reflection reflecting the content to an eye of the user, and a second surface reflecting the light incident on the display from the outside of the electronic device to the photographing unit
Data Source
AI summary
Disclosed is an electronic device. In the electronic device according to the present disclosure, a central axis of a viewing angle based on an eye of a user and the central axis of the viewing angle based on a lens optical axis of a camera match each other. An electronic device according to the present disclosure may be associated with an artificial intelligence module, robot, augmented reality (AR) device, virtual reality (VR) device, and device related to 5G services.