Proximity Sensor Package Structure for Crosstalk Alleviation
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Solution Overview
Problem
Proximity sensors face challenges in alleviating crosstalk caused by reflection light from both within the package structure and the optical window of electronic devices, which affects detection precision and requires a compact and thin design to comply with miniaturization requirements.
Innovation Solution
A proximity sensor design featuring a substrate with a light emitter and receiver enclosed by a resin with inclined surfaces on its boundary surface, including a first and second crosstalk alleviator, which redirect light away from the receiver, and a light-blocking film on the optical window to prevent crosstalk, enhancing detection precision and reducing internal reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a V-shaped groove is formed on the package structure to alleviate crosstalk from internal reflection light, then crosstalk from package internal reflections is reduced, but crosstalk from optical window reflection light that reflects off the bottom substrate and reaches the package surface near the light receiver is not effectively alleviated
Solution Approach 1:
The patent divides the crosstalk mitigation function into multiple segments: the V-shaped groove handles internal package reflections, while the light-blocking film handles optical window reflections that reach the package surface. This segmentation allows each component to address specific crosstalk sources effectively.
Solution Approach 2:
The light-blocking film acts as an intermediary element placed between the optical window and the package surface. It intercepts reflection light from the optical window before it can reach the package surface near the light receiver, preventing it from causing crosstalk.
2Volume of moving object
If the proximity sensor is made compact and thin to comply with miniaturization requirements, then the device size is reduced, but the complexity of alleviating crosstalk from multiple sources increases
Solution Approach 1:
The patent uses a thin film structure for the light-blocking film that can be integrated into the compact sensor design. This thin film approach allows crosstalk mitigation without significantly increasing the sensor's volume, complying with miniaturization requirements while maintaining effectiveness.
Solution Approach 2:
The patent combines multiple materials with different functions: the resin material for encapsulation, the light-blocking material for crosstalk mitigation, and the substrate material for structural support. This composite approach allows compact integration of multiple functions without proportionally increasing complexity.
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 design effectively alleviates crosstalk by redirecting light away from the receiver, improving detection precision and maintaining a compact form factor, thus addressing the challenges of miniaturization and thinning in electronic devices.
Implementation Method 1
Light emitted from the light emitter is reflected off the target object, and the presence of the target object can be detected when the light receiver detects the reflection light
Implementation Method 2
An inclined surface which defines the V-shaped groove enables light emitted from the light emitter to refract toward the outside of the package structure
Implementation Method 3
Light which reflects off the inclined surface is altered toward directions not directed toward the light receiver
Data Source
AI summary
The present disclosure provides a proximity sensor. The proximity sensor includes: a substrate including a main surface; a light emitter and a light receiver disposed on the main surface; a resin disposed on the main surface, enclosing the light emitter and the light receiver, and including a boundary surface spaced apart from the main surface; a first crosstalk alleviator disposed on the boundary surface and including a first inclined surface; and a second crosstalk alleviator disposed on the boundary surface and including a second inclined surface.