Optical Device Substrate Region Segmentation for Fingerprint Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display panels, such as LCD and OLED, cannot achieve full-color light display and face challenges in integrating a fingerprint identification module due to interference between light emitting devices and photo detectors.
Innovation Solution
The optical device incorporates a substrate with light emitting devices and a photo detector, where nanowire LEDs are grown on the substrate using epitaxy techniques to achieve full-color display, and the photo detector is embedded within the substrate to reduce interference and enable fingerprint identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light emitting devices and photo detectors are integrated in the same display panel, then fingerprint identification function is achieved, but interference or cross-talk between light emitting devices and photo detectors occurs
Solution Approach 1:
The display panel is divided into distinct regions: a first region containing light emitting devices and a second region containing photo detectors. This spatial segmentation separates the light emission function from the light detection function, preventing cross-talk while maintaining both functions within the same display panel structure.
Solution Approach 2:
The photo detectors are positioned in a second region that is spatially separated from the first region containing light emitting devices. This dimensional separation in the plane of the display panel allows both functions to coexist without interference, as light emitted in the first region does not directly reach the photo detectors in the second region.
2Reliability
If separate display panels and fingerprint identification modules are used, then each function is performed independently, but device size and manufacturing complexity increase
Solution Approach 1:
The light emitting devices and photo detectors are integrated into a single display panel structure with distinct functional regions. This merging eliminates the need for separate fingerprint identification modules, reducing overall device size and simplifying manufacturing while maintaining independent operation of both functions through regional separation.
Solution Approach 2:
The display panel is designed to perform multiple functions: light emission for display in the first region and light detection for fingerprint identification in the second region. This multi-functional design consolidates what would traditionally require separate devices into a single universal component, reducing complexity and size.
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 configuration allows for simultaneous full-color light display and fingerprint identification, reducing manufacturing costs and size while minimizing cross-talk and noise through the use of nanowire LEDs and an integrated photo detector.
Implementation Method 1
The light emitting devices are disposed on the first surface in the first region of the substrate... The pixel includes a plurality of nanowire LEDs
Implementation Method 2
The photo detector is disposed in the second region of the substrate... adjacent to the pixel
Implementation Method 3
nanowire LEDs are grown on the substrate using epitaxy techniques
Data Source
AI summary
An optical device includes a substrate, a plurality of light emitting devices, a photo detector and a circuit layer. The substrate has a first surface and a second surface opposite to the first surface. The substrate includes a first region and a second region. The light emitting devices are disposed on the first surface in the first region of the substrate. The photo detector is disposed in the second region of the substrate. The photo detector includes an electrical contact exposed from the second surface of the substrate. The circuit layer is disposed on the second surface of the substrate and electrically connected to the electrical contact of the photo detector.