Pixel-Level Analog Image Processing With Charge Redistribution
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Solution Overview
Problem
Current imaging devices lack the capability for high-speed operation and low power consumption while performing complex data processing, especially in analog data states, which limits their intelligence and user convenience.
Innovation Solution
The imaging device incorporates a pixel block with multiple transistors and a circuit structure that allows for image processing within the device, using metal oxide transistors and a correlated double sampling circuit to perform high-speed operations with reduced power consumption by redistributing charge and performing arithmetic operations locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If image processing is performed externally after data conversion, then processing capability is improved, but communication time and external device load increase
Solution Approach 1:
The patent merges the image processing function with the imaging device by integrating a processing circuit within the pixel array structure. This allows arithmetic operations to be performed locally on captured image data before output, eliminating the need for external processing and reducing communication time.
Solution Approach 2:
The patent adds a new functional dimension to the imaging device by incorporating processing circuits alongside the photoelectric conversion elements. This transforms the device from a simple capture tool to an integrated capture-and-process system, enabling high-speed operation without increasing external device load.
2Speed
If complex data processing is performed in analog state, then processing speed is improved, but power consumption increases
Solution Approach 1:
The patent implements local quality by performing analog arithmetic operations directly at the pixel level where the image data is captured. Each pixel or small group of pixels can perform processing locally in analog form, maintaining high speed while reducing the need for high-power digital conversion and external processing.
3Adaptability or versatility
If more intelligent functions are added to imaging device, then user convenience is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing processing circuits that can perform multiple arithmetic operations (addition, subtraction, multiplication, division) using the same hardware structure. This enables the imaging device to provide various intelligent functions without proportionally increasing complexity, as the same circuit can be configured for different operations.
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
This configuration enables efficient image processing, high-speed operation, and low power consumption, allowing for intelligent functions and improved user convenience by performing arithmetic operations directly within the imaging device.
Implementation Method 1
Each of the n pixels has a photoelectric conversion device and has a function of obtaining first image data in response to incident light on the photoelectric conversion device
Data Source
AI summary
An imaging device that has an image processing function and is capable of a high-speed operation is provided. The imaging device, which has an additional function such as image processing, can retain analog data obtained by an image capturing operation in a pixel and extract data obtained by multiplying the analog data by a predetermined weight coefficient. In the imaging device, some of potentials used for an arithmetic operation in pixels are generated by redistribution of charge with which wirings are charged. This enables an arithmetic operation to be performed at high speed with low power consumption, compared with the case where the potentials are supplied from another circuit to the pixels.