Optical Coating and AR Contrast Design for CTE and Power Limits
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Solution Overview
Problem
Wafer level optics face challenges due to coefficient of thermal expansion (CTE) mismatch between layers, leading to mechanical failure and spectral shifts, while augmented reality systems struggle with brightness in bright environments, resulting in power drain and reduced battery life. Additionally, antenna connections in mobile devices often suffer from inconsistency due to manufacturing tolerances.
Innovation Solution
The implementation of reflowable nanostructured antireflective coatings with matched CTE for wafer level optics and the integration of springs within antenna carriers to improve mechanical compatibility and signal quality, along with a subtractive contrast system using laser light to reduce photoreceptor sensitivity and enhance AR display brightness without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional antireflective coatings are used on wafer level optics, then spectral performance is improved, but mechanical stability deteriorates due to CTE mismatch between layers
Solution Approach 1:
The patent changes the physical-chemical parameters of the antireflective coating by making it reflowable at elevated temperatures. This allows the coating to flow and self-level during a reflow process, eliminating voids and improving adhesion to the underlying optics. The reflowable coating maintains its antireflective spectral performance while achieving mechanical stability through thermal processing that eliminates CTE mismatch issues.
Solution Approach 2:
The patent utilizes phase transition of the reflowable antireflective coating material. The coating transitions from a solid state at room temperature to a molten state during reflow processing, allowing it to conform to the underlying optics and eliminate voids. After cooling, it returns to solid state with improved mechanical bonding, thus resolving the contradiction between maintaining spectral performance and achieving mechanical stability.
2Illumination intensity
If AR display brightness is increased in bright environments, then visibility is improved, but power consumption increases reducing battery life
Solution Approach 1:
The patent substitutes the mechanical/optical approach of increasing display brightness with a physiological approach using laser light to modify eye photoreceptor sensitivity. Instead of mechanically increasing the AR display output power, a low-power laser selectively adapts the user's eyes to perceive the AR content as brighter, thus resolving the contradiction between visibility and power consumption.
Solution Approach 2:
The patent introduces laser light as an intermediary between the AR display and the user's eyes. The laser acts as a mediator that modifies the optical properties of the eye's photoreceptors, allowing the same AR display output to be perceived as brighter without actually increasing the display's power consumption. This intermediary approach resolves the contradiction by decoupling perceived brightness from actual energy consumption.
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 solution enhances the mechanical stability and spectral performance of wafer level optics and extends battery life in AR systems by reducing power consumption, while ensuring consistent and efficient antenna connections in mobile devices.
Implementation Method 1
forming a nanostructured coating over the lens block opposite to the substrate... the nanostructured coating may be configured as an interference coating such as an antireflective coating
Implementation Method 2
a dark source that introduces laser pulses into a user's eyes to temporarily reduce photosensitivity of the user's eyes
Data Source
AI summary
A device including an antenna, a printed circuit board having a side-plated contact, and an antenna carrier that includes an integrated spring having a conductive surface, such that the conductive surface is communicatively coupled to the side-plated contact can be used in optical systems. Disclosed computer-implemented systems and methods may include a dark source that when applied as part of an augmented reality projector, can temporarily reduce the photosensitivity of a user's eyes. Furthermore, a method for forming a lens block over a substrate and hardening the lens block and a method for motion-tolerant optical heart-rate monitoring can be disclosed herein for optical systems.