Integrated Proximity Sensor with Crosstalk Mitigation Trench
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Solution Overview
Problem
Conventional proximity sensor devices require large space due to separate packaging of light emitting diodes and light sensors, and existing integrated packages have high form factors and lack effective crosstalk mitigation methods.
Innovation Solution
The integration of a light emitting diode and light sensor assembly in a single compact package using an encapsulated lead frame with trenches filled with electromagnetic radiation blocking material to mitigate crosstalk, allowing for efficient detection of electromagnetic radiation in both infrared and visible light spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light emitting diode and light sensor assembly are packaged separately, then crosstalk is reduced, but device area increases
Solution Approach 1:
The patent combines the light emitting diode and light sensor assembly into a single integrated package, reducing the overall device area while implementing internal separation structures (trenches with electromagnetic radiation blocking material) to mitigate crosstalk between the components
2Area of moving object
If light emitting diode and light sensor assembly are integrated in compact package, then device area is reduced, but crosstalk increases
Solution Approach 1:
The patent segments the integrated package by forming trenches between the light emitting diode and light sensor assembly, filling these trenches with electromagnetic radiation blocking material to create internal separation that reduces crosstalk while maintaining the compact integrated structure
Solution Approach 2:
The patent introduces electromagnetic radiation blocking material as an intermediary substance filled in the trenches between the light emitting diode and light sensor assembly, which acts as a mediator to block electromagnetic radiation and reduce crosstalk while allowing the components to remain in close proximity
3Adaptability or versatility
If light sensor assembly detects broad spectrum radiation, then detection capability is improved, but crosstalk from LED increases
Solution Approach 1:
The patent applies local quality by implementing targeted electromagnetic radiation blocking measures (trenches filled with blocking material) specifically in the regions where crosstalk occurs, while allowing the light sensor assembly to maintain its broad spectrum detection capability in other directions
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 solution reduces the form factor of proximity sensor devices, effectively mitigates crosstalk, and enables efficient detection of nearby objects and ambient light, enhancing battery life and user experience in electronic devices.
Implementation Method 1
the light emitting diode is configured to emit electromagnetic radiation in a limited spectrum of wavelengths (e.g., infrared (IR))
Implementation Method 2
A light sensor receives the reflected electromagnetic radiation which is converted to an electrical signal (e.g., a current or voltage) indicative of the presence of an object
Implementation Method 3
The encapsulation layer includes a trench formed therein to receive electromagnetic radiation blocking material configured to block electromagnetic radiation in the limited spectrum of wavelengths to at least partially mitigate crosstalk between the light emitting diode and the light sensor assembly
Data Source
AI summary
Proximity sensor devices are described that integrate a light emitting diode with a light sensor assembly in a single, compact package. The proximity sensor devices comprise a substrate having a surface. The light emitting diode and light sensor assembly are mounted to the substrate proximate to the surface. The light emitting diode is configured to emit electromagnetic radiation in a limited spectrum of wavelengths, while the light sensor assembly is configured to detect electromagnetic radiation in the limited spectrum of wavelengths emitted by the light emitting diode. An encapsulation layer is formed on the surface over the light emitting diode and light sensor assembly. A trench is formed in the encapsulation layer to receive electromagnetic radiation blocking material configured to block electromagnetic radiation in the limited spectrum of wavelengths to at least partially mitigate crosstalk between the light emitting diode and the light sensor assembly.