Adjustable Visible Light Filter for Iris Recognition
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Solution Overview
Problem
Information handling systems, particularly displays with integrated image capture devices, face challenges in efficiently processing and filtering visible and near-field infrared light to enhance user identification and image capture capabilities while maintaining optimal display performance.
Innovation Solution
The integration of a display system with a visible light filter that can be selectively controlled to preferentially filter visible light over near-field infrared light, combined with an image capture device and touch panel, allows for enhanced user identification and image capture functionality by adjusting transmittance values to optimize light filtering and image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a visible light filter is integrated into the display system to preferentially filter visible light, then user identification capability is improved, but display performance may deteriorate
Solution Approach 1:
The visible light filter is configured with adjustable transmittance values that can be dynamically changed based on operational mode. The filter transitions between a first transmittance value during display operation (maintaining display performance) and a second transmittance value during image capture (enhancing user identification). This dynamic adjustment resolves the contradiction by allowing the system to optimize for either display performance or identification capability depending on the current operational state.
2Measurement precision
If transmittance is reduced for enhanced image capture, then image capture quality is improved, but light transmission for display is worsened
Solution Approach 1:
The filter's transmittance is dynamically adjusted based on the operational state of the display system. During normal display operation, the filter maintains a first transmittance value that allows sufficient light transmission for display performance. During image capture operations, the filter transitions to a second transmittance value that reduces visible light transmission while preferentially blocking visible light relative to near-field infrared, thereby enhancing image capture quality without permanently compromising light transmission capability.
3Measurement precision
If the filter preferentially blocks visible light over near-field infrared, then iris recognition is improved, but overall light transmission is reduced
Solution Approach 1:
The filter exhibits differential transmittance characteristics for different wavelength ranges. It is configured to preferentially block visible light wavelengths while allowing near-field infrared wavelengths to pass through with relatively higher transmittance. This local quality differentiation in the filter's optical properties enables improved iris recognition accuracy by enhancing the contrast of infrared reflections from the iris, while the overall light transmission is maintained at acceptable levels through the selective wavelength-based filtering approach.
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 solution enables effective user identification through preferential filtering of visible light, reducing transmittance for enhanced image capture, particularly for iris recognition, while maintaining display performance and flexibility in light transmission.
Implementation Method 1
a visible light filter that is selectively controllable to preferentially filter visible light over near-field infrared light
Implementation Method 2
an image capture device that is able to capture image information through the display system
Data Source
AI summary
A display system having a visible light filter that can be enabled and disabled to preferentially filters visible light over near-field infrared light is disclosed.