Micro LED Display With Integrated Fingerprint Detection Electrodes
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Solution Overview
Problem
Existing display technologies with micro LEDs lack an efficient and integrated fingerprint detection capability, limiting their use in personal identification systems.
Innovation Solution
A display apparatus with a detecting device that incorporates a substrate with pixels, inorganic light emitting elements, and intersecting detection and drive electrodes, allowing for simultaneous display and fingerprint detection by detecting changes in capacitance due to surface features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint sensor is added to micro LED display, then personal identification capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the fingerprint sensor electrodes with the display electrode structures, where detection electrodes and drive electrodes are integrated into the display device architecture. The sensor electrodes are formed using the same manufacturing processes as the display electrodes, merging two functions into a single integrated structure.
Solution Approach 2:
The display device serves multiple functions simultaneously: it displays images through micro LEDs and performs fingerprint detection through the integrated capacitive sensor electrodes. The same electrode structures serve both as display components and as fingerprint sensing elements.
2Measurement precision
If detection electrodes are added to display, then fingerprint detection capability is improved, but manufacturing complexity increases
Solution Approach 1:
The detection electrodes and drive electrodes are formed using the same manufacturing processes as the display electrodes, including sputtering, evaporation, or electroplating. The electrodes are patterned together in the same fabrication sequence, eliminating the need for separate manufacturing steps for the fingerprint sensor.
Solution Approach 2:
The electrodes are designed with specific geometric parameters (width, spacing, arrangement patterns) that optimize both display performance and fingerprint detection sensitivity. The detection electrode dimensions and configurations are tuned to achieve high-resolution fingerprint capture while maintaining display quality.
3Measurement precision
If multiple electrode types are arranged intersecting, then detection precision is improved, but device structure becomes more complex
Solution Approach 1:
The electrode system is divided into distinct detection electrodes and drive electrodes with specific arrangement patterns. Detection electrodes are arranged in a first direction while drive electrodes are arranged in a second direction, creating an intersecting grid that enables capacitive coupling for fingerprint detection.
Solution Approach 2:
The electrodes are arranged in intersecting directions to create a two-dimensional detection grid. This dimensional arrangement enables the system to capture fingerprint patterns across the surface area, improving detection precision by utilizing spatial distribution of capacitive coupling points.
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
Enables high-resolution fingerprint detection on the display surface without compromising image quality, providing a seamless integration of display and biometric functionality.
Implementation Method 1
detecting changes in capacitance due to surface features
Data Source
AI summary
A display apparatus with a detecting device includes a substrate, a plurality of pixels provided to the substrate, an inorganic light emitting element provided to each of the pixels, a plurality of detection electrodes arranged in a first direction parallel to the substrate, and a plurality of drive electrodes arranged in a second direction intersecting the first direction and provided intersecting the detection electrodes in planar view seen from a direction perpendicular to the substrate. The detection electrodes each includes a plurality of first linear parts, a plurality of second linear parts extending in a direction intersecting the first linear parts, and a bent part that couples the first linear part and the second linear part, the first linear parts and the second linear parts are metal thin wires, and the drive electrodes are translucent electric conductors.