Proximity Sensor Segmented Packaging for Crosstalk Reduction
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Solution Overview
Problem
Conventional proximity sensors in smartphones face challenges in reducing volume and thickness due to the need for shielding cases to avoid crosstalk, which limits their integration in modern devices with larger touch screens and narrower frames.
Innovation Solution
The design incorporates a substrate with an emitting and receiving unit, packaged in separate bodies with an isolating unit between them, eliminating the need for a shielding case by using a transparent packaging material and strategic lens configurations to minimize crosstalk and external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding case is used to avoid crosstalk, then crosstalk avoidance is improved, but sensor volume increases
Solution Approach 1:
The sensor is divided into separate emitting and receiving units with distinct packaging bodies. The isolating unit creates spatial segmentation between these components, allowing crosstalk avoidance without requiring a comprehensive shielding case around the entire sensor assembly.
Solution Approach 2:
An isolating unit acts as an intermediary element positioned between the emitting and receiving units. This isolating unit selectively blocks infrared light paths while allowing other functions to proceed, providing targeted crosstalk prevention without the need for extensive shielding structures.
2Reliability
If a shielding case is used to avoid crosstalk, then crosstalk avoidance is improved, but sensor thickness increases
Solution Approach 1:
The sensor structure is segmented into separate packaging bodies for emitting and receiving units, arranged in a planar configuration rather than stacked vertically. This segmentation allows crosstalk prevention through lateral isolation rather than vertical shielding, reducing thickness requirements.
Solution Approach 2:
The isolation mechanism transitions from vertical shielding (thickness dimension) to lateral separation (planar dimension). The isolating unit operates in the lateral direction between emitting and receiving units, moving the crosstalk prevention strategy to a different spatial dimension that does not increase sensor thickness.
3Reliability
If separate packaging bodies are used with an isolating unit, then crosstalk avoidance is improved, but device complexity increases
Solution Approach 1:
The packaging bodies and isolating unit are integrated into a unified packaging structure that encloses both emitting and receiving units. This merging of components into a single packaging system reduces the number of separate parts and simplifies assembly, offsetting the complexity introduced by the isolating unit.
Solution Approach 2:
The packaging structure serves multiple functions: it protects the sensitive components, provides structural support, and incorporates the isolating unit for crosstalk prevention. This multi-functionality reduces the need for additional separate components, thereby managing overall device complexity despite the enhanced isolation capabilities.
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 approach reduces the sensor's size, maintains effective crosstalk avoidance, and enhances sensitivity by focusing and collecting light efficiently, while preventing internal reflection and scattering, thus improving accuracy and sensitivity.
Implementation Method 1
The present disclosure relates to a proximity sensor, and more particularly to an infrared proximity sensor which can avoid crosstalk
Implementation Method 2
The working principle of the proximity sensor is emitting an electromagnetic field or light beam and analyzing a change by a receiving unit
Implementation Method 3
a part of the second side surface is formed as a curved shaped surface
Implementation Method 4
enhances sensitivity by focusing and collecting light efficiently
Implementation Method 5
The isolating unit formed between the first package body and the second package body
Implementation Method 6
preventing internal reflection and scattering
Data Source
AI summary
A proximity sensor includes a substrate, an emitting unit, a receiving unit, a packaging unit and an isolating unit. The emitting unit is disposed on an emitting region of the substrate. The receiving unit is disposed on a receiving region of the substrate. The packaging unit includes a first package body and a second package body. The first package body covers the emitting unit, and the second package body covers the receiving unit. The isolating unit is disposed between the first package body and the second package body. The first package body has a first top surface and a first side surface connected to the first top surface. The light can be emitted out the first top surface or the first side surface, respectively received by a second side surface or the second top surface of the second package body, and detected by the receiving unit.