Image Sensor Package Light Blocking for Flare and ESD Control
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Solution Overview
Problem
Image sensor packages are susceptible to flare due to light reflection, which introduces noise into captured images, and are also prone to electrostatic discharge (ESD) that can damage the image sensor die and cause defects in the captured image.
Innovation Solution
An image sensor package is designed with a light blocking member coupled to a transparent member, which includes a non-transparent layer or dam member to block light and reduce ESD, positioned between the active area of the image sensor die and the transparent member, with the light blocking member extending to the encapsulation material to minimize flare and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent member is used to cover the image sensor die, then light transmission is improved, but light reflection and flare occur introducing noise into the captured image
Solution Approach 1:
A light blocking member is introduced as an intermediary element between the transparent member and the image sensor die. This light blocking member selectively blocks reflected light and flare while allowing desired light transmission, thus mediating between the need for light transmission and the harmful light reflection effects.
Solution Approach 2:
The light blocking member is positioned specifically in regions where flare and reflection occur, such as around the periphery or at specific angles, rather than uniformly across the entire transparent member. This localized approach blocks harmful light while preserving light transmission in active imaging areas.
2Ease of manufacture
If the image sensor package structure is simplified, then manufacturing ease is improved, but susceptibility to electrostatic discharge increases
Solution Approach 1:
The light blocking member is designed to serve multiple functions: it blocks light to prevent flare, provides electrostatic discharge protection through conductive or dissipative materials, and can also serve as a structural support element. This multi-functionality allows ESD protection to be integrated without significantly complicating the package structure.
Solution Approach 2:
The light blocking member is constructed from composite materials that combine optical properties (light blocking) with electrical properties (ESD protection). For example, a polymer matrix filled with conductive particles or metal layers provides both light absorption and electrostatic discharge pathways, maintaining structural simplicity while enhancing reliability.
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 solution effectively reduces flare and ESD-related noise, thereby improving image quality and preventing damage to the image sensor die by blocking unwanted light and electrostatic discharge.
Implementation Method 1
a light blocking member coupled to or defined by the transparent member... configured to block light
Implementation Method 2
The light blocking member may include an anti-electrostatic discharge material... prevent damage to the image sensor die
Data Source
AI summary
According to an aspect, an image sensor package includes a substrate, an image sensor die coupled to the substrate, and a transparent member including a first surface and a second surface, where the second surface of the transparent member is coupled to the image sensor die via one or more dam members such that an empty space exists between an active area of the image sensor die and the second surface of the transparent member. The image sensor package includes a light blocking member coupled to or defined by the transparent member.