Sensor Concealment via Polarization Masking
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Solution Overview
Problem
Conventional methods for concealing sensors and light components in electronic devices are inadequate as they either limit light transmission or are complex and expensive to produce, particularly when these components need to be placed adjacent to a display where light transmission is necessary for proper functioning.
Innovation Solution
A two-component masking assembly comprising a linear polarizer and a wave plate, integrated with a translucent cover plate and a high optical density fluid, is used to partially conceal sensors and light emitters by preventing external light reflection, allowing sufficient light transmission for proper functioning while maintaining a dark appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional micro-perforation structures are used to conceal optical components, then the aesthetic appearance is improved by hiding the components, but light transmission is reduced limiting sensor functionality
Solution Approach 1:
The patent applies a polarization mask that changes its optical properties based on the polarization state of incident light. The mask appears dark or black when viewing reflected ambient light (concealing the component) but allows transmission of light with specific polarization states needed for sensor operation, effectively using optical property changes to resolve the contradiction between appearance and functionality
Solution Approach 2:
The invention changes the polarization parameter of light passing through the mask. By using a linear polarizer and wave plate combination, the mask transforms ambient light polarization states, allowing selective transmission of light while maintaining a dark appearance. This parameter transformation enables the mask to simultaneously achieve concealment and adequate light transmission for sensor operation
2Shape
If conventional micro-perforation structures are used to conceal optical components, then the aesthetic appearance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the concealing function from complex micro-perforation structures and implements it through a simpler polarization-based optical mask. The mask uses standard optical components (linear polarizer and wave plate) that can be manufactured and assembled more easily than precision micro-perforation structures, reducing manufacturing complexity while achieving the same aesthetic concealment effect
Solution Approach 2:
The polarization mask achieves the dark appearance effect through optical polarization properties rather than physical micro-perforations. This approach uses readily available optical films and materials that are simpler and more cost-effective to manufacture compared to precision micro-perforation processes, thereby reducing device complexity and production cost
3Shape
If a concealing structure is added to hide optical components, then aesthetic appearance is improved, but the device becomes more complex and expensive
Solution Approach 1:
The invention extracts the concealing function from complex mechanical or structural solutions and implements it through a relatively simple polarization optical mask. The mask can be manufactured using standard optical film lamination processes, which are more cost-effective than alternative concealing methods, thereby improving ease of manufacture while maintaining aesthetic appearance
Solution Approach 2:
The concealing structure uses a composite of standard optical materials (linear polarizer film and wave plate) that can be manufactured separately and assembled. This modular composite approach allows for easier manufacturing and lower production costs compared to monolithic concealing structures, while achieving the desired aesthetic effect
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 effectively conceals optical sensors and indicators, allowing for improved light transmission and reduced power consumption, while providing a cost-effective and aesthetically pleasing design by minimizing visible reflections and maintaining a black appearance.
Implementation Method 1
a linear polarizer to cause linear polarization of light which passes through it to an underlying component
Implementation Method 2
a wave plate to shift the axis of any reflected polarized light... to cause at least partial circular polarization of linearly polarized light which passes through the wave plate
Implementation Method 3
a layer of high optical density fluid held captive between the cover plate and the linear polarizer. The high optical density fluid has a refractive index greater than that of air
Data Source
AI summary
A concealing structure to at least partially conceal a sensor, light emitter or other component by at least partially preventing reflection of external light by an underlying structure. In some examples, this function is performed by a two-component masking assembly, the masking assembly including a linear polarizer to cause linear polarization of light which passes from the exterior of the device to an underlying component, and a wave plate to shift the axis of any reflected polarized light. In many cases, a high density optical fluid will further be included within the masking assembly to minimize reflections from the other components of the assembly.