Automatic Diopter Adjustment in VR Glasses via Pupil Tracking
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Solution Overview
Problem
Conventional VR glasses are designed for a fixed interpupillary distance, making it inconvenient for users with different distances to adjust the diopter, leading to unclear pictures and affecting user experience.
Innovation Solution
A device and method for automatically adjusting the diopter using a processor, pupil image acquisition unit, and transmission assembly within VR glasses, which acquires a pupil image, determines if adjustment is needed, and drives an adjusting ring to rotate the diopter adjusting lens assembly for precise adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional VR glasses are designed for a fixed interpupillary distance with large lenses to accommodate different users, then the device can be used by multiple users with different IPDs, but the device size and weight increase, and the user must manually adjust the diopter which is inconvenient
Solution Approach 1:
The system uses a camera to capture pupil images, automatically calculates the IPD, and controls the motor to adjust the lens assembly position without user intervention. The processor executes algorithms to determine optimal lens positioning based on captured pupil data, enabling self-adjustment that eliminates manual diopter adjustment while accommodating different users
Solution Approach 2:
The manual mechanical adjustment mechanism is replaced with an automated system comprising a camera for pupil detection, a processor for calculating IPD, and a motor-driven transmission assembly for adjusting the lens position. This substitution of mechanical manual adjustment with an automated opto-mechanical system resolves the contradiction between adaptability and ease of operation
2Adaptability or versatility
If the user wears the glasses inaccurately to accommodate different IPDs, then the device can be used by different users, but the picture definition becomes unclear
Solution Approach 1:
The system captures real-time pupil images through the camera, processes the images to calculate actual IPD, and uses this feedback information to control the motor in adjusting the lens assembly to the correct position. This closed-loop feedback mechanism ensures accurate picture definition for each user by dynamically adjusting lens position based on measured pupil distance
Solution Approach 2:
The system performs preliminary pupil detection and IPD calculation automatically when the user puts on the glasses, determining the correct lens position before the user begins using the device. This preliminary automatic adjustment ensures optimal picture definition is established beforehand, eliminating the need for users to manually adjust positioning
3Adaptability or versatility
If manual diopter adjustment is implemented, then users can adjust for their specific IPD, but the adjustment process is time-consuming and affects user experience
Solution Approach 1:
The system automatically performs diopter adjustment by capturing pupil images, calculating IPD, and controlling the motor to position the lens assembly without requiring user intervention. This self-adjusting mechanism eliminates the time users would otherwise spend manually adjusting diopter settings while maintaining adaptability to different IPDs
Solution Approach 2:
The automatic diopter adjustment is performed preliminarily and automatically when the user first wears the glasses, completing the adaptation process before the user begins their intended activity. This preliminary automatic adjustment eliminates subsequent time loss that would occur with manual adjustment, providing immediate optimal performance
Data Source
AI summary
Provided are a device and method for automatic diopter adjusting. The device and method are applied to VR glasses and achieve a desirable automatic VR diopter adjustment effect. The device includes: a barrel holder, a display module, a diopter adjusting lens assembly, at least two guide slots, an adjusting ring, a processor, a pupil image acquisition unit, and a transmission assembly. The pupil image acquisition unit acquires a pupil image displayed by the display module and transmits the pupil image to the processor. The processor determines whether diopter adjustment is needed, generates adjustment driving information, and drives the transmission assembly according to the adjustment driving information to work. The transmission assembly drives the adjusting ring to rotate, thereby driving the diopter adjusting lens assembly to rotate to adjust a distance between the diopter adjusting lens assembly and the display module, and realize adjustment on the diopter.