Image Sensor Pixel Array for Motion Detection and Image Capture
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Solution Overview
Problem
Traditional image sensors require separate hardware and circuit complexity to simultaneously detect motion and record images, leading to increased costs and complexity.
Innovation Solution
An image sensor circuit with a pixel array and a driver circuit that includes multiple pixel circuit groups with different exposure durations and frame rates, allowing for simultaneous motion detection and image recording using the same pixel circuit group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensors or readout circuits are used for motion detection and image recording, then motion detection sensitivity and image quality can be optimized independently, but hardware cost and circuit complexity increase
Solution Approach 1:
The patent implements a dual-mode pixel circuit that can operate in both motion detection mode and image recording mode using the same hardware infrastructure. The pixel circuit includes switches and capacitors that can be configured through control signals to achieve different exposure durations and readout modes, allowing a single circuit to perform multiple functions that traditionally required separate dedicated circuits
Solution Approach 2:
The patent combines motion detection and image recording functions into a single pixel array and readout circuit system. By merging the previously separate motion detection circuit and image recording circuit into one unified system, the patent reduces hardware cost and circuit complexity while maintaining the ability to perform both functions simultaneously or independently
2Adaptability or versatility
If separate sensors are used for motion detection and image recording, then both functions can be optimized independently, but hardware cost increases
Solution Approach 1:
The pixel circuit is designed with configurable switches and capacitors that enable it to adapt to different sensing requirements. Through control signals, the same pixel circuit can be configured for motion detection with shorter exposure durations or for image recording with longer exposure durations, providing versatility without requiring separate dedicated sensors for each function
Solution Approach 2:
The patent introduces dynamic configurability to the pixel circuit through control signals that can adjust the circuit configuration in real-time. The exposure duration and readout mode can be dynamically changed based on whether motion detection or image recording is the current objective, allowing the hardware to adapt to different sensing requirements without physical reconfiguration
3Adaptability or versatility
If different exposure durations are used for motion detection and image recording, then both sensing requirements can be met, but circuit design becomes more complex
Solution Approach 1:
The patent implements dynamic exposure duration control through control signals that can adjust the timing and configuration of switches and capacitors in the pixel circuit. The same circuit can be dynamically reconfigured to achieve different exposure durations appropriate for either motion detection or image recording, eliminating the need for separate dedicated circuits with fixed exposure characteristics
Solution Approach 2:
The patent changes the operational parameters of the pixel circuit through control signals, specifically adjusting exposure duration and readout timing parameters. By modifying these parameters dynamically, the circuit can adapt to different sensing requirements without requiring separate hardware designs for each function
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 enables efficient generation of high-quality image data and sensitive motion detection without the need for additional pixel circuit groups, reducing hardware costs and complexity.
Implementation Method 1
each of the pixel circuits in the pixel circuit group comprises a photodiode and a switch circuit. The photodiode is photosensitive and accumulates charge
Data Source
AI summary
Provided is an image sensor circuit, including a pixel array and a plurality of different control circuits. The pixel array comprises a plurality of pixel circuit groups arranged in an array. Each pixel circuit group comprises a plurality of pixel circuits that generate corresponding sensitivity values over exposure duration. The pixel circuits include a first quantity of first pixel circuits, and a second quantity of second pixel circuits. The plurality of different control circuits are respectively coupled to different pixel circuits to control the exposure duration thereof with different transmission signals. The different control circuits are also set to control different pixel circuits to output photo-sensed values at different frame rates. The image sensor circuit periodically generates the pixel value of each pixel circuit group according to first and second exposure durations, first and second frame rates, and first and second light sensitivity values of each pixel circuit group.