Camera Module Filter Protrusions for Reflection Control
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Solution Overview
Problem
The increasing demand for higher resolution camera modules is hindered by a resolution degradation phenomenon caused by reflection from display panels and infrared cutout filters.
Innovation Solution
A camera module design featuring a lens imaging system with a filter member having protrusions on its surfaces to minimize reflection, including a configuration with different shapes, sizes, and arrangements of protrusions on both the object-side and image-side surfaces, which reduces the impact of light refraction and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a display panel and infrared cutout filter are disposed in front of the camera module, then the camera module can block light having specific wavelengths, but resolution degradation occurs due to reflection and refraction from these components
Solution Approach 1:
An anti-reflection coating layer is introduced as an intermediary between the display panel/infrared cutout filter and the image sensor. This coating layer mediates the optical interaction by reducing reflection and refraction effects, allowing the filter components to maintain their light blocking function while minimizing their negative impact on image resolution.
Solution Approach 2:
The refractive index and thickness parameters of the anti-reflection coating layer are optimized to minimize reflection and refraction. By changing these physical parameters, the coating reduces the harmful optical effects while maintaining the necessary light blocking functionality of the filter components.
2Use of energy by moving object
If the area of the light transmissive region is increased to 1.5 to 2.0 times greater than the incident pupil area, then more light can reach the image sensor, but the complexity of the display panel and camera module configuration increases
Solution Approach 1:
The light transmissive region is extended in the lateral dimension beyond the incident pupil area, creating a larger light collection area. This dimensional expansion allows more light to reach the image sensor without requiring complex optical adjustments, as the additional area simply provides more direct light paths.
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
This design effectively minimizes the resolution degradation caused by reflection phenomena, enhancing the optical performance and image quality of the camera module.
Implementation Method 1
a first protrusion formed on a first surface of the filter member, and a second protrusion formed on a second surface of the filter member
Implementation Method 2
The first protrusion and the second protrusion may have any one shape of a conical, a truncated conical, a pyramidal, and a truncated pyramidal shape
Data Source
AI summary
A camera module includes a lens imaging system including one or more lenses for imaging incident light on an imaging plane, a filter member disposed between the lens imaging system and the imaging plane, a first protrusion formed on a first surface of the filter member, and a second protrusion formed on a second surface of the filter member.