Semiconductor Package with Optical Sensors for Diffuser Failure Detection
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Solution Overview
Problem
Flood illuminators using VCSELs can emit light with a small beam angle and high intensity, posing a safety risk if the diffuser fails, as the concentrated light can be dangerous to human eyes, and existing solutions do not effectively detect diffuser failures or water condensation that can increase light intensity.
Innovation Solution
A semiconductor device package with a light-emitting device, a diffuser structure, and multiple optical sensors positioned to detect reflected light, allowing for the detection of light intensity changes and water condensation, which triggers safety measures to prevent eye damage by turning off the light-emitting device when unsafe conditions are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If VCSELs are used to emit light with high intensity, then the illumination effectiveness is improved, but the safety risk to human eyes increases when diffuser fails
Solution Approach 1:
The patent implements safety measures before actual harm occurs by detecting diffuser failure through optical sensors that monitor reflected light intensity. When the diffuser fails, the sensor detects the sudden increase in reflected light intensity and triggers an alarm or shuts down the VCSELs before concentrated light can cause eye damage.
Solution Approach 2:
The patent uses optical sensors to continuously monitor the reflected light intensity from the diffuser and feeds this information back to a control system. When the reflected light intensity exceeds a safe threshold, the feedback mechanism triggers safety responses such as alarming or shutting down the light source, creating a closed-loop safety system.
2Reliability
If optical sensors are added to detect reflected light, then the safety detection capability is improved, but the device complexity increases
Solution Approach 1:
The optical sensors serve multiple functions: they detect diffuser failure by monitoring reflected light intensity, they can detect water condensation on the diffuser surface, and they provide feedback for safety control. This multi-functionality reduces the need for separate detection systems and minimizes overall device complexity while maintaining high reliability.
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 effectively prevents eye damage by detecting diffuser failures and water condensation, ensuring the light-emitting device is turned off when unsafe conditions occur, thereby enhancing safety and reducing the risk of injury from concentrated light.
Implementation Method 1
The first optical sensor is configured to detect a first reflected light reflected by the diffuser structure. The second optical sensor is configured to detect a second reflected light reflected by the diffuser structure.
Data Source
AI summary
A semiconductor device package includes a light-emitting device, a diffuser structure, a first optical sensor, and a second optical sensor. The light-emitting device has a light-emitting surface. The diffuser structure is above the light-emitting surface of the light-emitting device. The first optical sensor is disposed below the diffuser structure, and the first optical sensor is configured to detect a first reflected light reflected by the diffuser structure. The second optical sensor is disposed below the diffuser structure, and the second optical sensor is configured to detect a second reflected light reflected by the diffuser structure.