Active Pixel Sensor Protection Region for Stray Electron Interference
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Solution Overview
Problem
Image devices are susceptible to interference from diffused or stray electrons, leading to image shading and smear, which affects the accuracy and quality of captured images in applications like collision avoidance and object recognition.
Innovation Solution
A protection region is introduced in the image capture device to limit the influence of stray electrons on the storage region of pixels, with a Protection Region control unit dynamically adjusting the voltage level applied to the protection region based on integration time to optimize its effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a protection region is introduced to reduce stray electron interference, then image quality and accuracy are improved, but device complexity increases
Solution Approach 1:
A protection region is introduced as an intermediary structure between the pixel storage region and the source of stray electrons. This protection region, controlled by a dedicated control unit, acts as a mediator that selectively blocks or redirects stray electrons while allowing legitimate signal electrons to pass through, thereby improving image accuracy without fundamentally changing the pixel architecture
Solution Approach 2:
The pixel structure is segmented by introducing a separate protection region that is distinct from the storage region. This segmentation allows independent control of the protection function through a dedicated control unit, enabling the protection mechanism to be activated or adjusted without affecting the core pixel operation
2Reliability
If voltage level to protection region is dynamically adjusted based on integration time, then effectiveness against stray electrons is improved, but control complexity increases
Solution Approach 1:
The voltage level applied to the protection region is made dynamic rather than fixed. The control unit adjusts the voltage level based on the integration time, creating a dynamic protection mechanism that adapts to different operating conditions. This dynamic adjustment optimizes protection effectiveness across varying exposure times while using a relatively simple control logic
3Object-affected harmful factors
If protection region is used to reduce stray electron collection, then image shading and smear are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The protection mechanism utilizes changes in voltage level as a controllable parameter to adjust protection effectiveness. By varying the voltage applied to the protection region based on integration time, the system can optimize protection against stray electrons while compensating for manufacturing variations in the physical structure
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 significantly reduces the impact of stray electrons, enhancing the accuracy and quality of captured images by minimizing interference and allowing for flexible compensation for manufacturing variations and spectral response adjustments.
Implementation Method 1
A protection region is introduced in the image capture device to limit the influence of stray electrons on the storage region of pixels
Implementation Method 2
an array of sensors (pixels) that each generate and store an electrical signal in response to receiving electromagnetic radiation
Data Source
AI summary
Methods, systems and apparatuses for an imager that improve the quality of a captured image. The imager includes a pixel having a photosensor that generates charge in response to receiving electromagnetic radiation and a storage region that stores the generated charge. A protection region assists in keeping undesirable charge from reaching the storage region.