Anti-Reflective Coating on Cover Glass for Camera Imaging
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Solution Overview
Problem
Anti-glare coatings on cover glasses of information handling systems, such as portable devices, cause adverse optical effects like blurring of images captured by cameras due to glare reduction, and modifying the glass at the imaging area is not feasible due to mechanical stability concerns.
Innovation Solution
Applying an anti-reflective coating with a low index of refraction over the anti-glare coating at the imaging area to reduce scattering and improve light transmission, using materials like nanoporous films or sol-gel deposited magnesium fluoride, which can be selectively applied to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-glare coating is applied at the external surface of the glass sheet, then glare is reduced and viewing comfort is improved, but image quality deteriorates due to scattering and blurring effects
Solution Approach 1:
The patent applies different coating properties to different areas of the cover glass. The anti-glare coating is applied to the display area, while the imaging area either has no anti-glare coating or has a modified coating with different properties, allowing each area to have the quality appropriate for its function.
Solution Approach 2:
The cover glass surface is segmented into distinct functional zones: a display area with anti-glare coating for viewing comfort, and an imaging area with different coating characteristics for optimal camera performance. This segmentation allows independent optimization of each area.
2Manufacturing precision
If the glass sheet is modified at the imaging area to improve image quality, then light transmission is enhanced, but mechanical stability is compromised
Solution Approach 1:
Instead of uniformly modifying the entire glass sheet, the patent applies local modifications only to the imaging area through selective coating application. This allows image quality improvement while preserving the mechanical integrity of the overall glass structure.
Solution Approach 2:
The patent uses composite coating structures where different material layers with specific properties are applied to the glass surface. The anti-reflective coating layer is designed with specific thickness and refractive index properties to optimize optical performance without compromising the underlying glass mechanical strength.
3Manufacturing precision
If an anti-reflective coating is applied over the anti-glare coating, then light transmission is improved and image quality is enhanced, but the device structure becomes more complex
Solution Approach 1:
The patent combines multiple coating functions into an integrated multi-layer structure. The anti-glare and anti-reflective properties are achieved through a unified coating system applied in sequence, where the second coating layer is specifically designed to complement and enhance the properties of the first layer.
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-reflective coating improves image contrast and clarity by reducing the adverse effects of the anti-glare coating, promoting destructive interference and minimizing reflectivity, thus enhancing the overall image quality of the camera.
Implementation Method 1
The anti-reflective coating may improve light transmission of the cover glass... promoting destructive interference and minimizing reflectivity
Implementation Method 2
Applying an anti-reflective coating with a low index of refraction over the anti-glare coating at the imaging area to reduce scattering
Data Source
AI summary
Adverse optical effects from a cover glass used to cover a display of an information handling system may be reduced at an imaging area that covers an imaging device, such as a video camera. An anti-reflective coating may be applied at the imaging area over an anti-glare coating to improve light transmission and contrast at the imaging device.