AR Glasses Disparity Sensor for Active Dimming Control
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Solution Overview
Problem
Current artificial-reality glasses face challenges in maintaining proper dimming of lenses due to environmental changes, leading to inconsistent user experiences, as passive dimming technologies are prone to variability caused by temperature and environmental factors.
Innovation Solution
The implementation of active dimming techniques using sensors integrated into the glasses, which compare light information before and after passing through the lenses to adjust the dimming level electronically, providing a cost-effective, low-power, and lightweight solution for improving visibility and user comfort across different environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive dimming technology is used, then the device structure is simple, but the dimming consistency and reliability are poor due to temperature variability up to 25%
Solution Approach 1:
The patent implements a closed-loop feedback system where a sensor measures the actual light transmission through the lens, compares it to the desired transmission level, and automatically adjusts the dimming element to correct any deviations. This feedback mechanism eliminates the 25% variability of passive dimming by continuously monitoring and correcting the actual dimming performance based on real-time measurements.
Solution Approach 2:
The patent replaces passive mechanical/thermal dimming mechanisms with an active electronic control system. Instead of relying on temperature-dependent passive materials, the system uses an electronically controlled dimming element (such as an electrochromic device or liquid crystal) that can be precisely adjusted via electrical signals based on sensor feedback, thereby achieving consistent dimming performance independent of temperature fluctuations.
2Measurement precision
If active dimming control with sensor comparison is implemented, then dimming accuracy and visibility are improved, but power consumption and device complexity increase
Solution Approach 1:
The patent employs a lightweight sensor and processing approach that performs only the essential measurement and comparison functions needed for dimming control, avoiding excessive computational overhead. The system measures light levels and adjusts dimming only when necessary, rather than continuously processing complex data, thereby achieving adequate measurement precision with minimal power consumption.
Solution Approach 2:
The system uses the device's existing display content as a built-in reference standard for light measurement, eliminating the need for separate calibration sources or complex external reference systems. The display itself serves as the reference, allowing the sensor to compare transmitted light against the known display output, thereby achieving accurate measurement without additional power-intensive components.
3Device complexity
If closed-loop dimming control is implemented without dedicated calibration hardware, then device complexity and cost are reduced, but measurement precision may be compromised
Solution Approach 1:
The patent uses the display content itself as an intermediary reference standard for light measurement. Instead of requiring dedicated calibration hardware, the system leverages the known optical properties of the display to create a reference signal that the sensor can compare against the transmitted light through the lens. This intermediary approach enables accurate measurement while avoiding complex calibration equipment.
Solution Approach 2:
The patent makes the display serve multiple functions: it is both the content source and the reference standard for dimming calibration. By using the display's own light output as the reference, the system eliminates the need for separate calibration hardware, achieving multi-functionality that reduces device complexity while maintaining measurement precision through the inherent stability of the display's optical characteristics.
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 enhances the visibility of artificial-reality content and user comfort by dynamically adjusting lens dimming levels based on environmental conditions, eliminating the inconsistencies associated with passive dimming technologies.
Implementation Method 1
obtaining first light information measured via a first sensor positioned to receive light after it travels through a dimmable element
Implementation Method 2
obtaining second light information measured via a second sensor positioned to receive light that has not travelled through the dimmable element
Implementation Method 3
actively (electronically) adjusting a dimming level of the dimmable element based on a comparison between the first and second light information
Data Source
AI summary
A method of active-dimming control for augmented-reality glasses. The method includes, while a user is wearing augmented-reality glasses, obtaining a first set of light information measured via a first sensor on the augmented reality glasses which is positioned to receive light after it travels through a dimmable element of the augmented-reality glasses. The method further includes obtaining a second set of light information measured via a second sensor on the augmented reality glasses positioned to receive light that has not travelled through the dimmable element of the augmented-reality glasses. The method further includes electronically adjusting a dimming level of the dimmable element based on a comparison between the first set and second set of light information.