Color Filter Array Blue Density Reduction for Light Sensitivity
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Solution Overview
Problem
Conventional color filter arrays (CFAs) are photometrically slow due to high light absorption and have lower acuity for blue light, which affects the quality of captured images.
Innovation Solution
A color filter array with a lower density of blue filters, arranged in a 3×3 pattern with more red and green filters or white/transparent filters, increasing the overall sensitivity and light collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If red, green, and blue filters are used in conventional Bayer pattern, then three color planes can be captured, but the sensor becomes photometrically slow due to high light absorption
Solution Approach 1:
The patent extracts and removes blue filters from the conventional Bayer pattern, replacing them with white/transparent filters that do not absorb light. This extraction of the problematic blue filter element directly addresses the photometric speed issue while maintaining color capture capability through alternative means.
Solution Approach 2:
The patent changes the parameter of filter density by reducing blue filter density from the conventional equal distribution to a lower density configuration. This parameter change in filter distribution optimizes light transmission while preserving color information through the remaining blue filters and computational methods.
2Adaptability or versatility
If blue filters are densely distributed in conventional Bayer pattern, then blue color information is captured, but acuity for blue light is reduced due to lower cone density in human eye
Solution Approach 1:
The patent applies local quality by concentrating blue filter information capture at specific locations (center of 3x3 arrays) rather than uniformly distributing it. This localized approach aligns with human vision characteristics where blue cone density is lower, optimizing the balance between blue information capture and acuity preservation.
Solution Approach 2:
The patent changes the spatial distribution parameter of blue filters from uniform density to non-uniform density, reducing overall blue filter count while maintaining informational content. This parameter optimization reflects the physiological characteristics of human vision.
3Adaptability or versatility
If conventional Bayer pattern is used, then color image capture is achieved, but overall image brightness is reduced due to light absorption by filters
Solution Approach 1:
The patent converts the harmful light-absorbing property of traditional color filters into a benefit by using white/transparent filters that transmit light rather than absorb it. This transformation of the filtering mechanism directly increases image brightness while maintaining color capture capability through computational color reconstruction.
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 enhances image sensitivity and quality by reducing blue filter density, allowing more light to be captured, particularly improving blue light acuity and resulting in a brighter image with higher image quality.
Implementation Method 1
Because the red, green, and blue filters absorb two thirds of the incident light
Data Source
AI summary
A color filter array having a lower density of the color blue is provided. The color filter array includes: a plurality of color filter units arranged in a 3×3 array. The color filter units include a blue filter and a plurality of other filters, and the blue filter is disposed in the center of each 3×3 array, wherein a number of the blue filter is fewer than that of each kind of the other filters in each 3×3 array.