Micro LED Display Electrode Layout for Full-Screen Fingerprint Sensing
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Solution Overview
Problem
Current display technologies with micro LEDs lack an integrated fingerprint detection capability, which limits their functionality in personal identification and surface interaction.
Innovation Solution
A display apparatus with a detecting device that incorporates a substrate, inorganic light emitting elements, and a unique arrangement of metal thin wire detection and drive electrodes, allowing for fingerprint detection by capturing information from recesses and protrusions on a surface, including fingers, within the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint sensor is added to a micro LED display, then personal identification capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the fingerprint detection function with the display structure by integrating detection electrodes and drive electrodes directly into the display device. The detection electrodes are arranged in the display region and work together with drive electrodes to form a capacitive sensing system that detects fingerprint information while maintaining the display function.
Solution Approach 2:
The display device is designed to perform multiple functions: it serves as both a display device for showing images and as a fingerprint sensor for personal identification. The detection electrodes and drive electrodes are configured to enable fingerprint detection without requiring a separate dedicated sensor module, thus achieving multi-functionality.
2Area of stationary object
If detection electrodes are arranged in the display region, then fingerprint detection area is improved, but display image quality may deteriorate
Solution Approach 1:
The detection electrodes are arranged in specific patterns within the display region, with different areas having different functions. The electrodes are configured to detect fingerprint information in certain zones while allowing display functionality in overlapping areas, creating local differentiation of quality and function within the same region.
Solution Approach 2:
The patent uses an insulating film as an intermediary layer between the detection electrodes and the display elements. This insulating film allows the detection electrodes to function while preventing direct interference with the light emission from the micro LEDs, thus maintaining display image quality while enabling fingerprint detection.
3Measurement precision
If metal thin wires are used for detection electrodes, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The detection electrodes are divided into multiple segments including first linear parts, second linear parts, and bent parts. This segmentation allows the electrodes to be formed using standard thin film deposition processes while maintaining the precision needed for fingerprint detection. The segmented structure can be manufactured layer by layer using conventional semiconductor fabrication techniques.
Solution Approach 2:
The detection electrodes are arranged in a two-dimensional pattern with linear parts extending in different directions and bent parts coupling them. This dimensional arrangement optimizes the detection precision by creating multiple sensing zones while allowing the structure to be manufactured using planar thin film deposition processes, thus bridging the gap between precision requirements and manufacturing ease.
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.