Compact Lens Assembly Layout for Under-Display Camera Integration
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Solution Overview
Problem
Miniaturized electronic devices face challenges in harmonizing multiple cameras with the external appearance while maintaining high-quality image capture and minimizing display area reduction.
Innovation Solution
A lens assembly design with specific refractive powers and thicknesses, including convex and concave surfaces, and optimized spacing to fit within the device while overlapping with the display, minimizing active area reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cameras are mounted in a single electronic device to enhance image quality, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple camera systems into a single integrated lens assembly where multiple lenses (first lens with positive refractive power, second lens with negative refractive power, third lens, fourth lens, and fifth lens with positive refractive power) work together as one unified optical system. This merging approach allows multiple camera functions to be achieved while reducing overall structural complexity compared to mounting separate camera modules.
Solution Approach 2:
The patent employs a nested lens configuration where lenses are arranged in a compact sequence with specific spacing relationships. The first lens is positioned between the aperture stop and image sensor, the second lens between the first lens and image sensor, and subsequent lenses nested within the optical path. This nesting enables multiple optical elements to be integrated in a space-efficient manner, reducing device complexity while maintaining multi-camera functionality.
2Length of moving object
If lenses are positioned to overlap with the display, then device thickness is reduced, but display area is reduced
Solution Approach 1:
The patent positions the lens assembly such that it overlaps with the display area in the planar dimension, but compensates by optimizing the optical path length and lens spacing in the depth dimension. Specifically, the distance from the aperture stop to the object-side surface of the second lens is controlled within 0.55-1.4mm, and the fifth lens is positioned 0.13-0.30mm from the image sensor. This dimensional optimization allows the lens to overlap the display while minimizing the impact on active display area.
Solution Approach 2:
The patent employs specific parameter ranges for lens thicknesses and spacing to optimize the balance between device thickness and display area. The first lens has a center thickness greater than the second, third, and fourth lenses, while the fifth lens has a concave image sensor-side surface. These parameter optimizations enable compact integration that reduces device thickness while minimizing display area loss.
3Volume of moving object
If specific lens thicknesses and spacing are used to fit within the device, then device miniaturization is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for lens thicknesses and spacing that balance miniaturization with manufacturability. The first lens center thickness is greater than the second, third, and fourth lenses, the fifth lens has a concave image sensor-side surface, and the distance from the aperture stop to the object-side surface of the second lens is controlled within 0.55-1.4mm. These parameter specifications provide clear manufacturing targets that achieve compact device volume while maintaining reasonable precision requirements.
Solution Approach 2:
The patent divides the optical system into distinct lens segments (first lens, second lens, third lens, fourth lens, fifth lens) with specific functional assignments. Each lens has defined refractive power characteristics (positive or negative) and surface curvature requirements. This segmentation allows for modular manufacturing and assembly, where each lens can be manufactured to standard tolerances and then assembled to achieve the overall compact configuration, reducing the cumulative precision requirements.
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 lens assembly effectively integrates with the device's design, maintaining image quality and reducing display area loss, facilitating multiple camera configurations.
Implementation Method 1
a first lens between the aperture stop and the image sensor and having a positive refractive power, the first lens including an object-side surface that is convex
Implementation Method 2
a second lens between the first lens and the image sensor and having a negative refractive power
Implementation Method 3
a fifth lens between the fourth lens and the image sensor and having a positive refractive power, the fifth lens including an image sensor-side surface that is concave
Data Source
AI summary
A lens assembly and an electronic device including the lens assembly are provided. The lens assembly includes: an image sensor; an aperture stop aligned with the image sensor on an optical axis; a first lens between the aperture stop and the image sensor and having a positive refractive power, the first lens including an object-side surface that is convex; a second lens between the first lens and the image sensor and having a negative refractive power; a third lens between the second lens and the image sensor; a fourth lens between the third lens and the image sensor; and a fifth lens between the fourth lens and the image sensor and having a positive refractive power, the fifth lens including an image sensor-side surface that is concave.