Image Sensor Module with Nano-Rough Surface for Glare Reduction
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Solution Overview
Problem
The existing image sensor modules in portable electronic devices face challenges with glare generated by infrared light on catadioptrics telephoto lens assemblies, leading to incorrect exposure and color representation.
Innovation Solution
An image sensor module is designed with a light path that includes an image sensor, a reflecting element, an optical multilayer deposition structure layer, and a nano-rough surface. The optical multilayer deposition structure layer has a low reflectance for visible light and reflects infrared and ultraviolet light, while the nano-rough surface optimizes light transmission and reduces glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional light-blocking structure is used in the image sensor module, then infrared light blocking is achieved, but visible light transmission is reduced and color accuracy deteriorates
Solution Approach 1:
The light-blocking function is segmented into two distinct components: the optical multilayer deposition structure layer for infrared/ultraviolet blocking, and the nano-rough surface for visible light optimization. This segmentation allows each component to specialize in its function without interfering with the other, enabling effective infrared rejection while maintaining color accuracy.
Solution Approach 2:
Different regions of the optical path are given different optical properties. The optical multilayer deposition structure layer provides selective wavelength filtering (high reflectance for infrared/ultraviolet, low reflectance for visible light), while the nano-rough surface provides localized light scattering and anti-reflective properties. This local differentiation of optical qualities resolves the contradiction between infrared blocking and color accuracy.
2Object-affected harmful factors
If the optical multilayer deposition structure layer is placed closer to the image sensor, then infrared light blocking is improved, but visible light loss increases
Solution Approach 1:
The solution moves from a single-dimensional positioning problem to a two-dimensional optimization by introducing both the optical multilayer deposition structure layer and the nano-rough surface at different positions and orientations. The nano-rough surface is disposed on the image sensor surface while the optical multilayer deposition structure layer is positioned in the optical path at a distance, creating a multi-layered optical path optimization that maximizes visible light transmission while maintaining infrared rejection.
3Ease of manufacture
If a standard camera module design is used, then manufacturing is simplified, but the height of the module increases
Solution Approach 1:
The patent combines multiple functions into integrated components. The nano-rough surface is formed directly on the image sensor surface, merging the anti-reflective coating function with the sensor substrate. The optical multilayer deposition structure layer integrates infrared blocking with the existing optical path components. This merging eliminates the need for separate infrared blocking elements, thereby reducing overall module height while maintaining 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 solution effectively improves color contrast, avoids glare, and reduces the height of the camera module, enhancing the overall optical quality and capacity utilization rate.
Implementation Method 1
an optical multilayer deposition structure layer... a reflectance of the optical multilayer deposition structure layer corresponding to a light with a wavelength from 450 nm to 600 nm is less than or equal to 10%... reflects infrared and ultraviolet light
Implementation Method 2
a nano-rough surface... the nano-rough surface includes a plurality of nano-protruding structures... optimizes light transmission and reduces glare
Data Source
AI summary
An image sensor module has a light path, and includes an image sensor, a reflecting element, an optical multilayer deposition structure layer and a nano-rough surface. The image sensor corresponds to the light path. The reflecting element faces towards and is adjacent to the image sensor, and the reflecting element is configured to fold the light path. The optical multilayer deposition structure layer is farther away from the image sensor than the reflecting element away from the image sensor along the light path. The nano-rough surface is disposed on one side of the image sensor facing towards the reflecting element, and the nano-rough surface includes a plurality of nano-protruding structures. Shapes of the nano-protruding structures are irregular, and the nano-protruding structures are arranged adjacent to each other.