Infrared Camera Filter Structure with Multi-Directional Dichroic Dye
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Solution Overview
Problem
Infrared cameras used in virtual reality devices face challenges with visible light reflectivity, which causes imaging interference and stray light ghosts, affecting the accuracy of eye tracking and interaction.
Innovation Solution
A filter structure for infrared cameras comprising at least one film with dichroic dyes that absorb visible light, with molecular orientations in two non-parallel target directions, reducing visible light reflectivity and improving infrared light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional infrared camera lens is used, then infrared light can be transmitted, but visible light reflectivity causes imaging interference and stray light ghosts
Solution Approach 1:
The patent applies another dimension by introducing multi-directional molecular orientation (at least two non-parallel target directions) of dichroic dyes in the filter film. This dimensional approach to molecular arrangement enables the filter to absorb visible light from multiple angles simultaneously, effectively reducing visible light reflectivity and stray light interference while maintaining infrared transmission for accurate eye tracking imaging.
2Object-affected harmful factors
If a filter film with single-direction molecular orientation is used, then manufacturing is simpler, but visible light absorption is incomplete from multiple angles
Solution Approach 1:
The patent employs composite materials by combining dichroic dyes with orderly ordered molecules (such as liquid crystal molecules or stretched polymer molecules) that provide structural support and orientation guidance. This composite structure enables the dichroic dyes to maintain stable multi-directional molecular orientation, achieving comprehensive visible light absorption from multiple angles while keeping the filter film manufacturable through established techniques like stretching or liquid crystal alignment.
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 filter structure effectively reduces visible light reflectivity to less than 1% while maintaining high transmittance of infrared light at the working wavelength, minimizing stray light interference and enhancing eye tracking accuracy.
Implementation Method 1
the at least one dichroic dye is configured to absorb visible light
Implementation Method 2
molecular orientation of the dichroic dye of the at least one film comprises at least two target directions
Data Source
AI summary
A filter structure for an infrared camera, the infrared camera and virtual reality device are disclosed. An embodiment of the filter structure includes at least one film, the at least one film includes at least one dichroic dye, the at least one dichroic dye is configured to absorb visible light, and molecular orientation of the dichroic dye of the at least one film includes at least two target directions, and any two directions of the at least two target directions are not parallel.