Light-emitting Package with Capacitive Cover Sensing for Foreign Object Detection
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Solution Overview
Problem
Current light-emitting package structures, such as LEDs and VCSELs, are vulnerable to foreign objects and damage on the cover, which can affect light quality and safety, particularly in applications like facial recognition systems, where foreign objects can shield light and cause inaccurate determinations and potential eye harm.
Innovation Solution
A package structure for light-emitting elements that includes a shell, conductive paths, a light-emitting device, and light-transmitting sensing electrodes on the cover, forming a capacitance to detect foreign objects and damage, with the ability to control the light-emitting device's switch to prevent light emission when abnormalities are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover is added to protect the light-emitting device, then the device is protected from external damage, but foreign objects can fall on the cover and affect light quality and cause safety issues
Solution Approach 1:
The patent implements a feedback mechanism by placing sensing electrodes on the cover that detect the presence of foreign objects and the integrity of the cover itself. When abnormalities are detected (foreign objects or cover damage), the system automatically provides feedback to control circuitry that shuts down the light-emitting device, preventing harmful effects while maintaining protection during normal operation.
2Measurement precision
If the light source continuously emits light for facial recognition, then recognition accuracy is maintained, but foreign objects on the cover can shield light and cause inaccurate determinations
Solution Approach 1:
The patent applies preliminary action by placing sensing electrodes on the cover surface before light emission occurs. These electrodes continuously monitor for foreign objects and cover integrity issues beforehand. When abnormalities are detected, the system preemptively shuts down the light source, preventing inaccurate facial recognition determinations caused by light shielding from foreign objects.
3Illumination intensity
If the cover is made transparent to allow light emission, then light quality is maintained, but the cover can be damaged or peeled off causing infrared light to harm human eyes
Solution Approach 1:
The patent uses feedback through sensing electrodes that detect cover integrity by monitoring electrical properties across the cover material. When the cover is intact, light emission proceeds normally with maintained quality. When damage or peeling is detected, the system immediately shuts down the infrared light source, preventing eye harm while allowing continuous operation during normal conditions.
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
Effectively detects foreign objects and damage on the cover, preventing light emission and ensuring accurate determinations and eye safety by actively turning off the light source when abnormalities are detected.
Implementation Method 1
a capacitance is formed between the first light-transmitting sensing electrode and the second light-transmitting sensing electrode
Data Source
AI summary
A package structure of a light-emitting element includes a shell, a first conductive path, a second conductive path, a light-emitting device, a cover, a first light-transmitting sensing electrode, and a second light-transmitting sensing electrode. The shell has a top surface and a bottom surface, and the top surface is recessed toward the bottom surface to form an accommodating space. Each of the first and second conductive paths extends from the top surface to the bottom surface. The light-emitting device is disposed in the accommodating space. The cover is disposed over the shell. The first and second light-transmitting sensing electrodes are disposed on the same surface of the cover, and a capacitance is formed between the first and second light-transmitting sensing electrodes. The first and second light-transmitting sensing electrodes are electrically connected to the first and second conductive paths, respectively.