Optical Package Barrier Structure for Crosstalk Isolation
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Solution Overview
Problem
Existing optical package structures for wearable devices face challenges in effectively preventing optical crosstalk and improving optical efficiency while maintaining structural integrity and user comfort.
Innovation Solution
The optical package structure incorporates a carrier with an optical emitter and receiver, an optical barrier with a cavity filled by an insulating structure, and an encapsulant with an optical blocking structure, which enhances optical isolation and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical barrier is introduced to prevent optical crosstalk, then optical isolation is improved, but device complexity increases
Solution Approach 1:
The optical barrier is integrated within the encapsulant structure, nesting the barrier function inside the existing package geometry. The barrier extends from the top surface downward into the encapsulant, utilizing the encapsulant's volume to house the isolation structure without adding external complexity
Solution Approach 2:
The optical barrier is implemented as a thin film or layer within the encapsulant material. This thin-film approach provides effective optical isolation while minimizing the volume occupied and the structural complexity added to the device
2Reliability
If the top surface of the optical barrier is made higher than the encapsulant surface, then optical isolation is improved, but user comfort deteriorates due to increased height difference
Solution Approach 1:
The optical barrier is designed with a top surface that is substantially coplanar with the top surface of the encapsulant, creating a locally optimized structure where the barrier function is maintained without creating a height difference that would affect user comfort. The barrier extends downward into the encapsulant rather than protruding upward
Solution Approach 2:
Instead of increasing the barrier's height in the vertical dimension above the encapsulant surface, the barrier is extended in the horizontal dimension within the encapsulant volume. The isolation function is achieved by the barrier's presence within the encapsulant rather than by protruding above it
3Strength
If structural strength is increased to improve device durability, then reliability is improved, but optical efficiency may deteriorate due to additional structural elements
Solution Approach 1:
The encapsulant serves multiple functions simultaneously: it provides structural strength and mechanical support, houses the optical barrier for isolation, and maintains the optical pathway for light transmission. This multi-functionality eliminates the need for separate structural elements that would compromise optical efficiency
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 configuration effectively prevents optical crosstalk, improves optical efficiency, and increases the structural strength of the optical package, thereby enhancing user comfort and device performance.
Implementation Method 1
the optical barrier is over the carrier and between the optical emitter and the optical receiver
Implementation Method 2
The encapsulant encapsulates the optical emitter and the optical receiver
Data Source
AI summary
An optical package structure is provided. The optical package structure includes a carrier, an optical emitter, an optical receiver, an optical barrier, and an insulating structure. The optical emitter and the optical receiver are over the carrier. The optical barrier is over the carrier and between the optical emitter and the optical receiver, wherein the optical barrier defines a cavity. The insulating structure is filled in the cavity, wherein an elevation of a top surface of the insulating structure is lower than an elevation of a top surface of the optical barrier with respect to a surface of the carrier.