Wearable Optical Backlight Sensing for AR Image Contrast
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Solution Overview
Problem
The reflection of backlight from the user's face on optical devices like eyeglasses can limit virtual image contrast and increase electrical consumption, posing a challenge for augmented reality eyeglasses and electrochromic lenses, especially when anti-reflective coatings degrade.
Innovation Solution
Incorporating a light sensor within the optical device to measure backlight intensity, combined with a calculation module to determine and manage the backlight using various methods, including the use of reflecting parts and multiple light sensors with adjustable acceptance angles, to accurately calculate the amount of backlight received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display intensity is increased to improve virtual image visibility, then the virtual image contrast is improved, but the electrical consumption increases
Solution Approach 1:
The system uses light sensors to detect backlight intensity and feeds this information back to the display controller, which adjusts display intensity dynamically. This feedback mechanism allows the display to operate at optimal intensity levels rather than maximum, improving contrast when needed while reducing power consumption during normal operation.
Solution Approach 2:
The display intensity is made dynamic rather than static, adjusting in real-time based on detected backlight conditions. The system transitions between different operational states (high intensity for contrast, low intensity for power saving) based on environmental conditions, resolving the contradiction between maintaining visibility and reducing power consumption.
2Illumination intensity
If anti-reflective coatings are applied to reduce backlight reflection, then the virtual image contrast is improved, but the reliability of the coating degrades over time
Solution Approach 1:
The system uses the light sensors already present in the device to measure backlight intensity, turning an existing component into a diagnostic tool that compensates for coating degradation. The sensor data enables the system to self-adjust and maintain performance without relying on permanently effective anti-reflective coatings.
Solution Approach 2:
By continuously monitoring backlight intensity with light sensors, the system detects when coating effectiveness decreases and compensates by adjusting display parameters or electrochromic lens transmission, maintaining virtual image contrast despite coating degradation over time.
3Measurement precision
If multiple light sensors with adjustable acceptance angles are used to accurately measure backlight, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The measurement function is segmented across multiple light sensors with different acceptance angles positioned at different locations. Each sensor captures a specific portion of the light field, and their combined data provides comprehensive backlight measurement. This segmentation allows accurate measurement without requiring a single complex sensor system.
Solution Approach 2:
The light sensors serve multiple functions: they measure backlight intensity for display optimization, detect ambient lighting conditions, and provide data for electrochromic lens control. This multi-functionality justifies the added complexity by providing measurement precision benefits across multiple system functions.
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 system effectively manages backlight to enhance virtual image contrast and reduce electrical consumption by optimizing the operation of electrochromic lenses and holographic mirrors, ensuring user comfort and safety.
Implementation Method 1
a light sensor, the light sensor is located in an internal or inner side of the optical device and in a vicinity of a front part of the optical device, the light sensor is configured to determine an amount of light that it receives
Data Source
AI summary
A system that includes an optical device intended to be worn by a user and a calculation module. The optical device includes a light sensor, the light sensor being located in an internal side of the optical device and in a vicinity of a front part of the optical device, the light sensor being configured to determine an amount of light that it receives, and the calculation module being configured to determine an amount of backlight received by the optical device using the amount of light received by the light sensor.