Under-display camera lens coating for flare reduction
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Solution Overview
Problem
In electronic devices with under display cameras, the lens faces pixels in the display, causing flare due to light reflection, which results in a pixel pattern flare as light passes through the display, is reflected by the lens, and then by the rear surface before hitting the image sensor.
Innovation Solution
A coating layer with low reflectance is applied to the lens surfaces of the camera module, specifically formed on areas where the angle of the lens surface meets certain conditions, to reduce flare by minimizing reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied to all lens surfaces to reduce flare, then image quality improves, but manufacturing cost and complexity increase
Solution Approach 1:
The patent applies the coating layer selectively to specific lens surfaces based on the angle of slope criterion rather than uniformly to all surfaces. This local quality approach reduces manufacturing complexity and cost while still effectively reducing flare by targeting the surfaces that contribute most to the reflection problem.
Solution Approach 2:
The patent introduces a specific parameter (angle of slope within predetermined range) to determine which lens surfaces require coating. By changing the selection criterion from universal to parameter-based, the solution optimizes the balance between image quality improvement and manufacturing simplicity.
2Object-generated harmful factors
If a coating layer is applied to reduce reflection, then flare is reduced, but manufacturing cost increases
Solution Approach 1:
The coating is applied only to lens surfaces with angles of slope within a predetermined range, rather than all surfaces. This selective application reduces the amount of coating material and processing required, thereby lowering manufacturing cost while still effectively reducing flare from the critical surfaces.
Solution Approach 2:
The patent applies coating to only the necessary portion of lens surfaces (those with specific angle of slope) rather than all surfaces. This partial action is sufficient to reduce flare while minimizing manufacturing cost and complexity.
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 manufacturing costs by targeting specific lens surfaces with the coating, improving image quality in electronic devices with under display cameras.
Implementation Method 1
a coating layer, which lowers reflectance, is formed on a lens surface of the plurality of lenses
Data Source
AI summary
An electronic device includes a display including a panel layer in which a plurality of pixels are disposed, and a camera module disposed under the display, where the camera module includes an image sensor and a plurality of lenses, and an optical axis of the plurality of lenses passes through the panel layer. A coating layer, which lowers reflectance, is formed on a lens surface of the plurality of lenses when an angle of slope of a partial area of the lens surface is within a specified range. The angle of slope is an angle formed by the lens surface with a normal line perpendicular to the optical axis.