Under Display Camera Blue Pixel Ratio Adjustment
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Solution Overview
Problem
The image quality of under-display cameras (UDCs) is affected by lower light transmittance in the blue wavelength range, leading to increased noise in blue components of the Bayer image, which degrades the overall image captured.
Innovation Solution
The use of a second image sensor module with a color filter array having a higher proportion of blue pixels than the first image sensor module, allowing for improved light reception and noise reduction in blue components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional color filter array with standard blue pixel proportion is used in the UDC, then the device structure remains simple and manufacturing is easier, but the light transmittance in the blue wavelength range is low causing increased noise in blue components
Solution Approach 1:
The patent changes the proportion of blue pixels in the color filter array from the conventional 1:2:1 (R:G:B) ratio to a modified ratio with higher blue pixel proportion. This parameter change compensates for the low light transmittance in the blue wavelength range caused by the display overlay, thereby reducing noise in blue components and improving overall image quality.
Solution Approach 2:
The patent applies different color filter array configurations to different regions or uses a specifically designed color filter array with non-uniform blue pixel distribution. This local optimization ensures that areas requiring better blue light capture have enhanced blue pixel presence, while maintaining overall image quality and color accuracy.
2Measurement precision
If the proportion of blue pixels in the color filter array is increased to compensate for low blue light transmittance, then noise in blue components is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent modifies only the proportion parameter of blue pixels in the existing Bayer pattern color filter array, rather than fundamentally changing the entire color filter structure. This approach maintains compatibility with existing image sensor architectures while achieving improved blue light capture, thus limiting the increase in device complexity.
3Ease of manufacture
If a standard Bayer pattern color filter array is used, then the manufacturing process is straightforward and consistent, but the image quality in blue components deteriorates due to low light transmittance through the display
Solution Approach 1:
The patent adjusts the blue pixel proportion parameter in the color filter array design while maintaining the overall Bayer pattern structure. This allows existing manufacturing processes to be adapted with minimal changes, preserving ease of manufacture while significantly improving blue component image quality through the modified pixel distribution.
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 approach effectively reduces noise in the blue component of the image, enhancing the overall image quality captured by the UDC by increasing the signal-to-noise ratio for blue colors.
Implementation Method 1
light transmittance in a short wavelength including a blue color may be lower than the light transmittance in remaining wavelengths including a red color and a green color
Data Source
AI summary
An electronic device includes a display; a camera module disposed to overlap at least a portion of the display and comprising at least one first image sensor module to generate a first Bayer image processed by a first color filter array and at least one second image sensor module to generate a second Bayer image processed by a second color filter array; and a processor. The first color filter array includes at least one first red pixel, at least one first green pixel, and at least one first blue pixel. The second color filter array includes at least one second red pixel, at least one second green pixel, and at least one second blue pixel. A proportion of the least one second blue pixel in the second color filter array is greater than a proportion of the least one first blue pixel in the first color filter array.