Vision Sensor Reset Bias Voltage Adjustment for High Temperature Leakage
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Solution Overview
Problem
Vision sensors face challenges in accurately detecting light intensity variations at high temperatures due to increased leakage currents in reset switches, leading to errors in polarity information detection.
Innovation Solution
A vision sensor system that includes a pixel array, a voltage generator, a temperature sensor controller, a temperature comparing circuit, and a voltage level controller, which adjusts the voltage level of the reset bias voltage based on temperature information to compensate for leakage currents and improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vision sensor operates at high temperature, then the detection speed and event response capability are improved, but the leakage current in reset switches increases causing errors in polarity information detection
Solution Approach 1:
The patent changes the voltage parameter of the reset switch by applying different voltage levels based on temperature conditions. At high temperatures, a higher voltage level is applied to the reset switch to compensate for increased leakage current, thereby maintaining detection accuracy while preserving fast response capability
Solution Approach 2:
The patent implements a feedback mechanism where temperature information is continuously monitored and used to dynamically adjust the reset switch voltage level. This closed-loop control ensures that the voltage applied to the reset switch is optimized for current temperature conditions, preventing polarity detection errors while maintaining detection speed
2Device complexity
If a fixed voltage level is applied to the reset switch, then the circuit design is simple, but detection accuracy deteriorates at high temperatures due to leakage current
Solution Approach 1:
The patent transitions from a static fixed voltage design to a dynamic voltage adjustment system. The reset switch voltage level is dynamically changed based on temperature conditions, allowing the system to adapt to varying operating conditions and maintain accuracy across different temperature ranges
Solution Approach 2:
The patent modifies the voltage parameter of the reset switch based on temperature information. By changing the voltage level from a fixed value to a temperature-dependent variable, the system compensates for temperature-induced leakage current while maintaining relatively simple circuit architecture
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 system effectively reduces errors in light intensity variation detection at high temperatures by controlling the voltage level of the reset switching signal, enhancing the accuracy and reliability of event sensing.
Implementation Method 1
generating multiple pieces of temperature information at different time points from each other by sensing a temperature of the vision sensor
Implementation Method 2
adjusting a voltage level of a reset bias voltage provided to the plurality of pixels based on the obtained specified number of pieces of the temperature information
Data Source
AI summary
A vision sensor includes a pixel array including a plurality of pixels, a voltage generator configured to generate a reset bias voltage provided to each of the plurality of pixels, a temperature comparing circuit configured to output a switching setting value according to a result of comparing temperature information with at least one reference temperature value, and a voltage level controller configured to generate a reset bias setting signal based on the switching setting value. The reset bias setting signal adjusts a voltage level of the reset bias voltage.