Adjusting Interpupillary Distance in Head-Mounted 3D Displays
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Solution Overview
Problem
Head-mounted 3D displays face deviations in application effect due to varying interpupillary distances among users, leading to ghost images and adverse user experience, as they lack an adjustable interpupillary distance function.
Innovation Solution
A method and system for adjusting the interpupillary distance, involving scanning the user's distance, setting image centers on the display screen, and guiding the user to adjust lens positions using symmetrical guiding images, ensuring the image and lens centers align with the user's pupils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If head-mounted 3D display uses fixed interpupillary distance design, then device structure is simple, but application effect deviates for different users
Solution Approach 1:
The patent implements dynamic adjustment of interpupillary distance through motor-driven lens assemblies that can move along the optical axis. The system transitions from a fixed structure to a dynamically adjustable one, allowing real-time adaptation to different users' interpupillary distances while maintaining reasonable structural complexity through automated control mechanisms.
Solution Approach 2:
The patent changes the physical parameter of interpupillary distance by moving the left and right eye lenses along the optical axis to different positions. This parameter adjustment enables the display to adapt to different users' interpupillary distances, resolving the contradiction between adaptability and structural simplicity through controlled physical transformation.
2Reliability
If head-mounted 3D display lacks interpupillary distance adjustment, then device operation is simple, but ghost images appear
Solution Approach 1:
The patent implements self-service through automatic interpupillary distance detection using image processing technology. The system captures images of the user's eyes, automatically calculates the interpupillary distance, and adjusts the lens positions accordingly without requiring manual user intervention. This eliminates ghost images while keeping the operation simple for the user.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated optical-mechanical system. Instead of requiring users to manually position lenses, the system uses image capture, processing, and motor-driven adjustment to automatically achieve proper alignment, thereby improving display quality while maintaining ease of operation.
3Measurement precision
If head-mounted 3D display uses automatic interpupillary distance scanning, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent achieves high measurement precision by integrating multiple functions into a unified system: the display screen serves both as the 3D display medium and as the imaging surface for capturing user eye positions. The processing unit handles both display control and image processing for interpupillary distance measurement, reducing overall system complexity while maintaining high measurement accuracy.
Solution Approach 2:
The patent merges the display function and measurement function into a single integrated system. The same display screen and processing unit are used for both presenting 3D content and capturing/processing images to measure interpupillary distance, thereby achieving high measurement precision without proportionally increasing system complexity.
Data Source
AI summary
The present disclosure discloses methods, systems and modules for adjusting an interpupillary distance of a head-mounted 3D display. The method comprising: receiving a signal to start the head-mounted 3D display, after receiving the signal, scanning an interpupillary distance of a user wearing the head-mounted 3D display; setting centers of left and right eye images of a display screen based on the interpupillary distance of the user, wherein the centers of the left and right eye images are symmetrical about a physical midline of the display screen; and playing the same left and right eye guiding images by taking the centers of the left and right eye images as their centers, respectively, on the display screen to guide the user to adjust positions of left and right eye lenses. A head-mounted 3D display adopting the technical solution of this invention has an interpupillary distance adjustment function, making it suitable for different users.