Optical Device Light Shielding Wall Cross-Talk Reduction
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Solution Overview
Problem
In optical modules, cross-talk interference occurs due to direct light emission from light-emitting components reaching light detectors, leading to potential sensor malfunctions.
Innovation Solution
Incorporating a light shielding layer and wall structure within the optical device or module, utilizing opaque materials to block light transmission between the emitter and detector, and forming a light shielding element with a recess to enhance light blocking capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light shielding layer and wall structure are added to block light transmission, then cross-talk interference is reduced, but device complexity increases
Solution Approach 1:
A light shielding layer is introduced as an intermediary element between the light emitter and light detector. This layer, made of opaque material, mediates the light transmission path by blocking undesired direct light while allowing the detector to receive reflected light from external objects, thus reducing cross-talk interference.
Solution Approach 2:
The light shielding structure extends into the vertical dimension with a wall component that rises from the light shielding layer. This three-dimensional configuration effectively blocks light paths from multiple angles, preventing direct light from reaching the detector while maintaining a compact footprint on the substrate.
2Reliability
If opaque materials are used to block light transmission, then cross-talk is reduced, but light transmitting capability of encapsulant is compromised
Solution Approach 1:
The optical device employs spatially differentiated optical properties: the light shielding layer and wall are made opaque to block light in specific directions (direct path), while the encapsulant material remains transparent to allow light transmission in other directions (reflected light path). This local differentiation of optical quality enables simultaneous cross-talk reduction and light transmission.
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
Effectively reduces cross-talk interference and improves the performance of optical devices by preventing undesired light from reaching the detector, thereby enhancing the accuracy and reliability of sensor operations.
Implementation Method 1
Incorporating a light shielding layer and wall structure within the optical device or module, utilizing opaque materials to block light transmission between the emitter and detector
Implementation Method 2
a light transmitting encapsulant encapsulating the light emitter and the light detector
Data Source
AI summary
An optical device includes a carrier including a light transmitting layer and a light shielding layer disposed on the light transmitting layer. The optical device further includes a light emitter disposed on the carrier and a light detector disposed on the carrier. The optical device further includes a light transmitting encapsulant encapsulating the light emitter and the light detector, and a light shielding wall disposed in the light transmitting encapsulant and in contact with the light transmitting encapsulant and the light shielding layer.