Pixel Array Layout for Uniform Shading and Wider Dynamic Range
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Solution Overview
Problem
Existing imaging devices face challenges in improving image quality, particularly in expanding the dynamic range and achieving uniform shading characteristics, due to differences in pixel output when pixels are disposed at equal distances from the center of the pixel array unit.
Innovation Solution
The imaging device incorporates a pixel array unit with both first and second pixels, where the second pixels convert a smaller amount of charge per unit time than the first pixels, and are strategically disposed to be equal in distance from the center of the pixel array unit, ensuring uniform output and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixels are disposed at equal distances from the center of the pixel array unit, then the dynamic range is expanded, but the shading characteristics become non-uniform
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of second pixels based on their position within the pixel array unit. Specifically, second pixels in different regions (e.g., central region vs. peripheral regions) are arranged at different distances from the center, rather than uniformly. This regional differentiation compensates for position-dependent variations in light reception, achieving uniform shading characteristics across the entire array while preserving the expanded dynamic range benefits of having multiple pixel types.
2Adaptability or versatility
If second pixels converting smaller charge are added to expand dynamic range, then the dynamic range is improved, but the device complexity increases
Solution Approach 1:
The patent segments the pixel array unit into multiple regions (central region and peripheral regions) with different arrangements of second pixels. This segmentation allows the system to manage complexity by treating different regions independently, where each region's second pixel arrangement is optimized for its specific position. The segmentation strategy enables the complex multi-type pixel structure to be systematically organized, making the increased device complexity more manageable while achieving the desired dynamic range expansion.
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 configuration enhances image quality by reducing output differences between pixels and achieving uniform shading characteristics, thereby improving the dynamic range and overall image performance.
Implementation Method 1
multiple second pixels provided in corresponding one of the multiple unit pixels and each converting a smaller amount of charge per unit time than the multiple first pixels
Data Source
AI summary
An imaging device of an embodiment of the present disclosure includes a semiconductor substrate, multiple first pixels, and multiple second pixels. The semiconductor substrate includes a first surface and a second surface that are opposed to each other, and includes a pixel array unit in which multiple unit pixels are arranged in a matrix. The multiple first pixels are each provided in corresponding one of the multiple unit pixels. The multiple second pixels are each provided in corresponding one of the multiple unit pixels and convert a smaller amount of charge per unit time than the multiple first pixels. The multiple second pixels are each disposed in corresponding one of the unit pixels to allow the multiple second pixels to be equal to each other in distance from a center of the pixel array unit, on the basis of respective positions, in the pixel array unit, of the multiple unit pixels in which the respective second pixels are provided, in a planar view.