Pixel Structure for HDR Imaging and Phase Difference Detection
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Solution Overview
Problem
Existing solid-state imaging devices face challenges in simultaneously achieving high dynamic range imaging and phase difference detection due to the trade-off between lens curvature for phase difference characteristics and HDR image generation, and the sensitivity to shape variations in lens structures.
Innovation Solution
A solid-state imaging device with a pixel structure that includes multiple pixel sets, each with color filters of the same color, and each pixel having multiple photoelectric conversion parts, allowing for simultaneous acquisition of signals for high dynamic range imaging and phase difference detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the curvature of the on-chip lens is increased to increase the refractive power, then phase difference characteristics are improved, but HDR image generation becomes difficult
Solution Approach 1:
The imaging device divides the pixel array into multiple regions, with some pixels configured for phase difference detection (with higher curvature lenses) and other pixels configured for HDR imaging (with lower curvature lenses). This segmentation allows both functions to coexist without mutual interference.
Solution Approach 2:
Different on-chip lenses are designed with different curvatures according to their specific functional requirements. Phase difference detection pixels receive lenses with higher curvature for better angle dependence, while HDR pixels receive lenses with lower curvature for reduced angle dependence. Each local region has optimized quality for its intended purpose.
2Reliability
If the curvature of the on-chip lens is reduced to reduce the refractive power, then HDR image generation is improved, but phase difference characteristics are deteriorated
Solution Approach 1:
The pixel array is segmented into functional zones where HDR-optimized pixels and phase difference-optimized pixels are spatially separated. This allows each segment to operate at its optimal performance level without compromising the other.
Solution Approach 2:
The lens curvature is locally optimized for each pixel's intended function. HDR pixels receive lenses with curvature optimized for minimal angle dependence, while phase difference pixels receive lenses with curvature optimized for maximum angle dependence. This local customization resolves the global trade-off.
3Adaptability or versatility
If a lens structure with variable curvature is used to achieve both characteristics, then both phase difference and HDR characteristics can be achieved, but the structure is sensitive to shape variation and difficult to produce in large quantities
Solution Approach 1:
Instead of creating a single complex variable-curvature lens structure that is difficult to manufacture, the patent segments the pixel array and assigns different fixed-curvature lenses to different regions. This approach maintains mass production feasibility while achieving dual functionality through spatial distribution.
Solution Approach 2:
The imaging device achieves multi-functionality not through a single universal lens structure, but through a plurality of specialized lens types distributed across the pixel array. Each lens type is optimized for its specific function, and the combination provides universal capability for both phase difference detection and HDR imaging.
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
Enables simultaneous acquisition of high dynamic range images and phase difference signals, improving both imaging capabilities without compromising on production scalability.
Implementation Method 1
each pixel including a plurality of photodiodes PD
Data Source
AI summary
The present technology relates to a solid-state imaging device and an electronic apparatus that enable simultaneous acquisition of a signal for generating a high dynamic range image and a signal for detecting a phase difference. The solid-state imaging device includes a plurality of pixel sets each including color filters of the same color, for a plurality of colors, each pixel set including a plurality of pixels. Each pixel includes a plurality of photodiodes PD. The present technology can be applied, for example, to a solid-state imaging device that generates a high dynamic range image and detects a phase difference, and the like.