Pixel Group Readout Control for High Dynamic Range Imaging
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Solution Overview
Problem
Current imaging devices lack precise control over electrical charge accumulation and readout periods on a cell-by-cell basis, leading to suboptimal performance in imaging applications.
Innovation Solution
The implementation of an imaging element with a plurality of groups of pixels, each equipped with dedicated signal readout units and control units that allow for individual control of exposure and readout based on evaluation values computed from pixel signals, enabling tailored electrical charge accumulation and readout strategies for each group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control line is used for each cell in the imaging unit, then the device complexity is reduced, but the control precision over electrical charge accumulation and readout periods deteriorates
Solution Approach 1:
The imaging unit is divided into multiple independently controllable cell units, each with its own control line. This segmentation allows precise control of electrical charge accumulation and readout periods for each cell, resolving the contradiction by enabling fine-grained control without requiring a completely new control architecture.
Solution Approach 2:
The patent introduces a time dimension to the control mechanism by enabling different accumulation periods and readout timings for different cells. This temporal dimensionality allows the system to achieve precise control over charge accumulation while maintaining a relatively simple spatial control line structure.
2Device complexity
If electrical charge accumulation periods are not minutely controlled on a cell-by-cell basis, then the device complexity is reduced, but the image quality and dynamic range deteriorate
Solution Approach 1:
Each cell unit is equipped with independent control capabilities that allow tailored electrical charge accumulation periods and readout timings according to local imaging requirements. This local quality approach enables optimization of image quality for different regions while maintaining overall system simplicity.
3Adaptability or versatility
If differential control of signal readout units is implemented for each group, then the adaptability to varied lighting conditions is improved, but the device complexity increases
Solution Approach 1:
The imaging unit is divided into multiple groups, each with dedicated control units that can independently adjust accumulation periods and readout timings. This segmentation enables adaptability to varied lighting conditions across different regions while organizing complexity into manageable modular units.
Solution Approach 2:
The control units are designed to dynamically adjust accumulation periods and readout timings based on real-time imaging conditions. This dynamic control capability allows the system to adapt to varied lighting conditions while using systematic control mechanisms that prevent excessive complexity.
Data Source
AI summary
An imaging element comprising: an imaging unit that has: a plurality of groups each including at least one pixel; and a plurality of signal readout units that are each provided to each of the groups and read out a signal from the pixel; and a control unit that controls the signal readout unit in at least one group among the plurality of groups is provided. Each of the plurality of groups may include a plurality of the pixels. The control unit may select at least one group among the plurality of groups and control the signal readout unit by using a control parameter that is different from a control parameter that is used for another group among the plurality of groups.