Pixel Lens Segmentation for HDR Imaging and Phase 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 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 HDR 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 on-chip lens is divided into multiple regions with different curvatures: a first region with a first curvature optimized for phase difference detection and a second region with a second curvature optimized for HDR imaging. This segmentation allows each region to independently optimize its function without compromising the other.
Solution Approach 2:
Different regions of the on-chip lens are assigned different local optical properties (curvatures) to perform different functions. The first region has higher curvature for phase difference detection while the second region has lower curvature for HDR imaging, allowing each local area to have the quality needed for its specific 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 on-chip lens is divided into multiple regions with different curvatures: a first region with a first curvature optimized for phase difference detection and a second region with a second curvature optimized for HDR imaging. This segmentation allows each region to independently optimize its function without compromising the other.
Solution Approach 2:
Different regions of the on-chip lens are assigned different local optical properties (curvatures) to perform different functions. The first region has higher curvature for phase difference detection while the second region has lower curvature for HDR imaging, allowing each local area to have the quality needed for its specific purpose.
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 using a complex continuously variable curvature lens, the patent divides the lens into discrete regions with fixed curvatures. This segmentation simplifies the manufacturing process while maintaining the ability to provide different optical characteristics for different functions.
Solution Approach 2:
The patent changes the curvature parameter of the on-chip lens in discrete steps across different regions rather than using continuous variation. This approach maintains the versatility of having different optical characteristics while significantly improving manufacturability through standard fabrication processes.
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 autofocus capabilities and image quality.
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.