Camera Module Anti-Reflecting Layer for Stray Light Reduction
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Solution Overview
Problem
Camera modules suffer from stray light issues due to micro lens arrays, which degrade image quality by causing light diffraction and reflection, leading to paddle flare and affecting light-gathering ability.
Innovation Solution
Incorporating an anti-reflecting layer with an irregular nano-crystallite structure layer and an optical connecting layer, where the optical connecting layer is connected to the nano-crystallite structure layer and partially contacts air, disposed on the micro lens arrays layer or light filtering layer, to reduce reflection and improve transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a micro lens arrays layer is used to converge light energy, then light-gathering ability is improved, but stray light is generated due to light diffraction and reflection
Solution Approach 1:
An anti-reflecting layer is introduced as an intermediary between the micro lens arrays layer and the light filtering layer. This layer includes an irregular nano-crystallite structure layer with refractive index gradient that mediates the optical interaction, reducing reflection and stray light generation while preserving the light-gathering function of the micro lens arrays
Solution Approach 2:
The anti-reflecting layer changes the refractive index parameter gradually from the substrate to the air interface through its irregular nano-crystallite structure. This refractive index gradient (from approximately 1.7 at the bottom to 1.0 at the top) reduces optical impedance mismatch, thereby minimizing reflection and stray light while maintaining light transmission
2Reliability
If an anti-reflecting layer is added to reduce stray light, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent extracts the anti-reflecting function into a separate, dedicated layer with specific irregular nano-crystallite structure, rather than attempting to modify existing layers. This extracted layer can be optimized independently for anti-reflection performance while maintaining the original functions of the micro lens arrays and light filtering layers
Solution Approach 2:
The anti-reflecting layer uses a composite structure combining irregular nano-crystallite material with specific optical properties. This composite material provides both the refractive index gradient needed for anti-reflection and the structural stability required for manufacturing, balancing performance improvement with manufacturing feasibility
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 anti-reflecting layer effectively minimizes stray light, enhances light-gathering ability, and improves image quality by reducing reflection and increasing transmittance, while maintaining structural stability and manufacturing efficiency.
Implementation Method 1
the anti-reflecting layer includes an irregular nano-crystallite structure layer and an optical connecting layer... to reduce reflection and improve transmittance
Implementation Method 2
The anti-reflecting layer is disposed on a surface of at least one of the light filtering layer and the micro lens arrays layer... effectively minimizes stray light
Implementation Method 3
the optical connecting layer is connected to the irregular nano-crystallite structure layer and a top of the optical connecting layer partially contacts an air
Implementation Method 4
The photoelectric converting layer is for converting a light signal of an imaging light to an electric signal
Implementation Method 5
The micro lens arrays layer is for converging an energy of the imaging light into the photoelectric converting layer
Implementation Method 6
the light filtering layer is for absorbing a light at a certain wavelength region of the imaging light
Data Source
Figure 1
Figure 2A
Figure 2B~2C
AI summary
A camera module includes an imaging lens assembly module and an image sensor. The image sensor is disposed on an image surface of the imaging lens assembly module and includes a photoelectric converting layer, a micro lens arrays layer, a light filtering layer and an anti-reflecting layer. The photoelectric converting layer is for converting a light signal to an electric signal. The micro lens arrays layer is for converging an energy of the imaging light into the photoelectric converting layer. The light filtering layer is for absorbing a light at a certain wavelength region of the imaging light. The anti-reflecting layer is disposed on a surface of at least one of the light filtering layer and the micro lens arrays layer and includes an irregular nano-crystallite structure layer and an optical connecting layer. The optical connecting layer is connected to the irregular nano-crystallite structure layer.