Ambient Light Sensor Metasurface Wavelength Separation
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Solution Overview
Problem
Conventional ambient light sensors with multiple bandpass filters require separate patterning processes, leading to longer cycle times and higher manufacturing costs due to the need for multiple process cycles, which can result in cosmetic defects and misalignment issues.
Innovation Solution
The implementation of a metasurface with nanostructures that can separate different wavelengths of ambient light, allowing desired colors to be transmitted while unwanted colors are absorbed or reflected, replacing the need for multiple bandpass filters and enabling patterning over a single process cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple bandpass filters are used to gather optical readings on different colors, then color distinguish ability is improved, but manufacturing complexity and cycle time increase due to separate patterning processes
Solution Approach 1:
The patent merges multiple bandpass filters into a single metasurface structure with multiple nanostructures. Each nanostructure is designed to provide different spectral response characteristics, allowing the metasurface to function as multiple filters simultaneously. This eliminates the need for separate patterning processes for each filter, reducing manufacturing complexity while maintaining color distinction capability.
Solution Approach 2:
The metasurface structure serves multiple functions simultaneously: it acts as both the filtering element and the spectral separation mechanism. The single metasurface structure provides multiple spectral bands through its nanostructure design, making it a universal component that replaces what would traditionally require multiple separate filters and patterning steps.
2Measurement precision
If multiple bandpass filters are patterned separately, then each filter can be optimized for its specific wavelength, but manufacturing costs and cycle time increase
Solution Approach 1:
The patent combines multiple wavelength-selective filters into a single metasurface fabrication process. The metasurface is patterned once to create all necessary nanostructures simultaneously, eliminating multiple patterning cycles. This maintains wavelength selectivity through careful nanostructure design while significantly reducing manufacturing cycle time.
3Adaptability or versatility
If multiple separate filters are used, then spectral coverage can be achieved, but cosmetic defects and misalignment issues occur during manufacturing
Solution Approach 1:
The patent merges multiple filter functions into a single metasurface structure that is patterned once. This eliminates the misalignment issues that arise when multiple separate filters are manufactured and assembled. The single patterning process ensures consistent positioning and eliminates cosmetic defects associated with multiple fabrication steps, while maintaining comprehensive spectral coverage through the nanostructure design.
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 simplifies the production process, reduces cosmetic defects, and allows for quicker and cheaper fabrication of ambient light sensors while maintaining the same optical performance as conventional designs, with improved alignment and reduced optical noise.
Implementation Method 1
The metasurface includes a plurality of nanostructures... Each of the plurality of nanostructures is different from the other nanostructures in the metasurface. The different nanostructures of the metasurface may be designed to allow different wavelengths (or colors) of ambient light to transmit to the plurality of sensing portions
Implementation Method 2
unwanted colors (including infrared from sunlight) are either absorbed or reflected away by the multi-spectral bandpass filters
Implementation Method 3
unwanted colors (including infrared from sunlight) are either absorbed or reflected away by the multi-spectral bandpass filters
Data Source
AI summary
An ambient light sensor includes a substrate, a metasurface disposed on the substrate, and an aperture layer disposed on the substrate. The metasurface includes a plurality of nanostructures and a filling layer laterally surrounding the plurality of nanostructures. The aperture layer laterally separates the metasurface into a plurality of sub-meta groups.