Sensor Package Structure With Roughened Ring to Reduce Flare
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Solution Overview
Problem
Conventional sensor package structures experience light reflection issues, leading to flare phenomena at the sensing region due to light passing through a light-permeable layer.
Innovation Solution
A sensor package structure is designed with a substrate, sensor chip, metal wires, and a light-permeable layer featuring an inner ring-shaped roughened region on its surface, which scatters light to prevent reflection onto the sensing region, thereby reducing flare effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-permeable layer is used to allow light to reach the sensor chip, then light transmission is improved, but light reflection causing flare phenomenon occurs
Solution Approach 1:
The light-permeable layer is divided into two regions with different surface properties: a smooth transparent region over the sensing area that maintains high light transmission, and a roughened region over the non-sensing area that reduces light reflection. This local differentiation resolves the contradiction by allowing light transmission where needed while preventing reflection where it causes harm.
Solution Approach 2:
The roughened region acts as an intermediary element that intercepts and scatters light before it can reflect off metal wires into the sensing region. This mediator structure prevents the harmful reflection pathway while maintaining the light-permeable layer's overall transparency function.
2Reliability
If metal wires are used to electrically connect the substrate and sensor chip, then electrical coupling is achieved, but light reflection from metal wires causes flare at the sensing region
Solution Approach 1:
The roughened region is strategically positioned to cover the metal wires, converting the harmful reflective property of the metal wires into a beneficial light-scattering function. The roughened surface diffuses light that would otherwise reflect directly into the sensing region, thereby eliminating the flare problem while preserving the electrical connection function.
3Illumination intensity
If the light-permeable layer is made fully transparent to maximize light transmission, then light reaching the sensor is improved, but flare phenomenon increases due to uncontrolled light paths
Solution Approach 1:
The light-permeable layer implements spatially varying optical properties: the transparent smooth region maximizes light transmission to the sensing area, while the roughened region controls light paths to prevent flare. This local quality differentiation resolves the contradiction between maximizing light transmission and maintaining measurement precision.
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 inner ring-shaped roughened region effectively reduces light reflection onto the sensing region, improving the performance of the sensor package structure by minimizing flare phenomena.
Implementation Method 1
light arriving on the inner ring-shaped roughened region by passing through the light-permeable layer can be scattered to prevent the light from being reflected to the sensing region
Data Source
AI summary
A sensor package structure is provided and includes a substrate, a sensor chip disposed on the substrate, a plurality of metal wires electrically coupling the substrate and the sensor chip, a frame fixed on the substrate, and a light-permeable layer that is disposed on the frame. The light-permeable layer has a transparent segment and a ring-shaped segment that surrounds the transparent segment. The ring-shaped segment is disposed on a top end surface of the frame, so that the light-permeable layer, the frame, and the substrate jointly define an enclosed space that accommodates the sensor chip and the metal wires therein. The ring-shaped segment has an inner ring-shaped roughened region that is arranged on an inner surface thereof and that is fixed onto the top end surface of the frame. Moreover, an inner edge of the inner ring-shaped roughened region is arranged in the enclosed space.