Eyewear Display Light Conversion for Alignment and Intensity Feedback
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Solution Overview
Problem
The intensity of display light emitted from an optical engine in augmented or mixed reality eyewear diminishes over time, and the alignment of optical components shifts due to vibrations or drop events, affecting the quality of the virtual image delivered to the user.
Innovation Solution
Incorporating light conversion components such as phosphors or quantum dots between the optical engine and waveguide to convert a portion of the display light to higher wavelengths, which are then detected by sensors to generate control signals for the optical engine to adjust intensity or direction, ensuring consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light conversion components are added to monitor display light intensity and alignment, then the reliability of the virtual image quality is improved, but the device complexity increases
Solution Approach 1:
The light conversion components serve dual purposes: they convert display light to longer wavelengths for monitoring purposes while also serving as part of the display optical path. The sensors detect both alignment information and intensity variations, making the monitoring system multi-functional rather than adding separate dedicated components for each function.
Solution Approach 2:
The system incorporates sensors that continuously monitor the converted light to provide feedback signals to the optical engine controller. This feedback mechanism enables real-time adjustment of the optical engine parameters to maintain consistent virtual image quality, resolving the reliability issue through active control rather than passive monitoring.
2Stability of the object's composition
If real-time monitoring and control of display light is implemented, then the stability of display parameters is improved, but the use of energy increases
Solution Approach 1:
The system uses a portion of the display light itself (converted to longer wavelengths) as the monitoring signal source, eliminating the need for separate monitoring light sources. The optical engine adjusts its own output based on feedback from sensors detecting the converted light, creating a self-regulating system that maintains stability without requiring external energy-intensive monitoring equipment.
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
The system maintains consistent display light intensity and alignment, thereby ensuring high-quality virtual images are delivered to the user by real-time adjustments based on monitoring data.
Implementation Method 1
a plurality of light conversion components positioned between the optical engine and the waveguide. The plurality of light conversion components converts a second portion of the display light to converted light having higher wavelengths than the display light
Implementation Method 2
one or more sensors configured to detect the converted light to generate converted light data
Implementation Method 3
an adhesive bridge between the one or more filter layers and the one or more sensors, the adhesive bridge having a refractive index to couple the converted light from one side of the one or more filter layers to the one or more sensors
Implementation Method 4
the light beams are 'guided' through the substrate, typically by multiple instances of total internal reflection (TIR), to then be directed out of the waveguide by an output optical coupling
Data Source
AI summary
An eyewear display includes an optical engine to emit display light having one or more wavelengths in the visible light range. The eyewear display includes a waveguide to incouple a first portion of the display light, the first portion of the display light including light having the one or more wavelengths in the visible light range. The eyewear display also includes light conversion components positioned between the optical engine and the waveguide, the light conversion components to convert a second portion of the display light to generate converted light having higher wavelengths than the display light. In addition, the eyewear display includes a sensor to detect the converted light and a controller to modify the emission of display light from the optical engine based on the detected converted light.