Event Photodetection Pixel Array With Dynamic Power and Clock Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photodetection elements consume power wastefully due to fixed low consumption control settings regardless of imaging scenes, leading to a trade-off between power consumption and resolution.
Innovation Solution
A photodetection element with a pixel array, holding circuit, and control circuit that dynamically controls power supply voltage and clock signals based on event detection, allowing selective power management for event detection elements arranged in a two-dimensional array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low consumption control is performed according to fixed settings regardless of imaging scene, then power consumption is reduced, but resolution is reduced and power is wastefully consumed
Solution Approach 1:
The patent applies dynamics by transitioning from fixed low consumption control settings to dynamic control that adapts to the imaging scene. The control circuit dynamically adjusts operating parameters based on whether the scene contains event detection targets, enabling the system to optimize between power consumption and resolution in real-time according to actual conditions.
Solution Approach 2:
The patent implements parameter changes by modifying operational parameters such as clock frequency and power supply voltage based on the imaging scene. When events are detected, the system switches to normal driving mode with higher parameters; when no events are present, it transitions to low consumption mode with reduced parameters, thereby resolving the contradiction between power savings and resolution.
2Use of energy by moving object
If low power consumption mode is set with pixel addition mode, then power consumption is reduced, but resolution is reduced
Solution Approach 1:
The system dynamically switches between pixel addition mode and normal driving mode based on the imaging scene. This dynamic adaptation allows the system to use pixel addition mode (which reduces resolution) only when necessary for power savings, while maintaining normal resolution when event detection requires it, thus resolving the trade-off between power consumption and resolution.
Solution Approach 2:
The patent changes operational parameters including mode selection based on scene analysis. By detecting whether the scene contains events, the system adjusts parameters to select appropriate operating modes, ensuring that resolution is maintained when needed while enabling power-saving modes when the scene is static.
3Use of energy by moving object
If ADC is set to standby state according to settings regardless of imaging scene, then power consumption is reduced, but resolution is affected
Solution Approach 1:
The patent applies dynamics by making the ADC standby state configurable rather than fixed. The control circuit allows dynamic adjustment of ADC operation based on the imaging scene, enabling the system to balance power consumption and resolution by adapting ADC behavior to actual detection needs.
Solution Approach 2:
The system changes ADC operational parameters based on scene detection. When the scene indicates no events are present, the ADC can be set to standby state to save power. When events are detected, the ADC transitions to active state to maintain resolution and detection accuracy, thus resolving the contradiction between power savings and measurement precision.
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
Achieves low power consumption without reducing resolution by selectively controlling power supply and clock signals for event detection elements, enabling high-speed and low-power event detection.
Implementation Method 1
a light receiving element that receives light
Implementation Method 2
event detection elements that detect an intensity difference of received light
Data Source
AI summary
Photodetection elements and electronic devices with low power consumption in event detection are disclosed. In one example, a photodetection element includes a pixel array, a holding circuit, a control circuit, and a signal processing circuit. In the pixel array, event detection elements that detect an intensity difference of received light are arranged in a two-dimensional array. The holding circuit holds an event detected by the event detection elements. The control circuit controls a power supply voltage and a clock signal for the event detection element belonging to at least a partial region of the pixel array and the holding circuit corresponding to the event detection element. The signal processing circuit processes a signal output from the event detection element.