CMOS Pixel Circuit for Hardware Image Binarization
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Solution Overview
Problem
Conventional imaging devices face challenges in executing image processing, binarizing image data, and performing arithmetic processing efficiently, while also requiring high sensitivity, low power consumption, and reliability.
Innovation Solution
An imaging device is designed with a CMOS circuit structure incorporating metal oxide transistors and a photoelectric conversion element, capable of compressing data and performing binary output operations, which includes a pixel circuit with specific transistor connections and configurations to enhance data processing and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If software processing is used for image binarization, then the imaging device can achieve accurate binary output, but the processing speed is reduced compared to hardware processing
Solution Approach 1:
The patent replaces software-based image processing with hardware-based processing using a specialized circuit structure. The pixel array directly outputs binary signals through a circuit that includes transistors and capacitors configured to perform binarization operations in hardware, eliminating the need for software conversion and achieving both high speed and accurate binary output.
2Productivity
If data compression is implemented in the imaging device, then the data processing efficiency is improved, but the circuit complexity increases
Solution Approach 1:
The patent divides the imaging device into distinct functional segments: a pixel array for light detection, a data processing unit for compression operations, and an output interface. This segmentation allows compression functionality to be added without overwhelming the overall circuit complexity, as each segment handles specific tasks independently.
Solution Approach 2:
The patent designs the circuit components to serve multiple functions. For example, the same transistor and capacitor structures are used for both signal processing and data compression operations, reducing the need for additional dedicated components and thereby limiting the increase in circuit complexity while maintaining high processing efficiency.
3Use of energy by moving object
If metal oxide transistors are used in the CMOS circuit, then the power consumption is reduced and reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes metal oxide transistors which have different electrical characteristics compared to conventional transistors. By changing the material parameter (using metal oxide instead of silicon), the device achieves lower power consumption and higher reliability due to the material's inherent properties, such as lower leakage current, while the manufacturing process is adapted to accommodate these material-specific requirements.
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 imaging device achieves efficient image processing, binarization, and arithmetic processing with high sensitivity and low power consumption, providing a reliable solution for data analysis and output.
Implementation Method 1
one embodiment of the present invention is an imaging device including a pixel capable of performing a binary output operation of an image signal
Data Source
AI summary
An imaging device capable of executing image processing is provided. A structure is employed in which a photoelectric conversion element, a first transistor, a second transistor, and an inverter circuit are included; one electrode of the photoelectric conversion element is electrically connected to one of a source and a drain of the first transistor; the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor; the one of the source and the drain of the second transistor is electrically connected to an input terminal of the inverter circuit; and data obtained by photoelectric conversion is binarized and output.