Micro LED Display Pixel Layout for Infrared Biometric Sensing
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Solution Overview
Problem
Displays using micro LEDs face challenges in effectively detecting biological information due to interference from visible light output, which can hinder accurate detection of objects such as fingerprints and vein patterns.
Innovation Solution
Incorporating both visible light and infrared light emitting elements into the display device, where visible light elements are used for image display and infrared elements are used for biological information detection, allowing for simultaneous image rendering and high-definition biological information sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If visible light emitting elements are used for display, then image display function is achieved, but biological information detection capability deteriorates due to light interference
Solution Approach 1:
The pixel structure is segmented into separate functional zones: a first region contains only visible light emitting elements for display, while a second region contains both visible light emitting elements and infrared light emitting elements for biological information detection. This spatial segmentation allows the visible light elements to perform display functions without interfering with the infrared detection capability in the second region.
Solution Approach 2:
Different regions of the display device are assigned different functional properties: the first region is optimized for visible light display, while the second region is configured for both display and infrared detection. This local differentiation enables the device to simultaneously achieve high-quality visible light imaging and accurate infrared biological information detection without mutual interference.
2Measurement precision
If infrared light emitting elements are added for biological information detection, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines visible light emitting elements and infrared light emitting elements within the same pixel structure, specifically in the second region where both types of elements are integrated. This merging approach allows the device to achieve infrared detection capability while utilizing the existing visible light display infrastructure, thereby reducing the overall increase in device complexity compared to adding completely separate detection systems.
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 enables effective detection of biological information by utilizing infrared light, while maintaining visible light output for image display, thereby enhancing the device's capability to detect fingerprints and vein patterns with high precision.
Implementation Method 1
The first inorganic light emitting elements are configured to output first light in a visible light region
Implementation Method 2
The second inorganic light emitting elements are configured to output second light in an infrared light region
Data Source
AI summary
A display device includes a substrate, a plurality of pixels provided to the substrate, and a plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements provided to the pixels. The first inorganic light emitting elements are configured to output first light in a visible light region, and the second inorganic light emitting elements are configured to output second light in an infrared light region.