Array Sensor Resistor Network Bias Voltage Supply
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Solution Overview
Problem
Infrared imaging apparatuses face challenges in reducing sensitivity unevenness across large sensor element arrays, leading to degraded image quality due to temperature fluctuations and discontinuous driving conditions, which affect the correction processing and output image quality.
Innovation Solution
An array sensor with a sensor element array divided into regions, where different bias voltages are applied to signal processing circuits to reduce sensitivity variations, using a resistor network with first and second resistor elements of varying resistances to supply bias voltages and ensure continuous voltage variation across the sensor surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels in the sensor element array is increased to improve resolution, then the resolution is improved, but the size of the entire array sensor increases
Solution Approach 1:
The array sensor is divided into multiple regions, and each region is further divided into multiple blocks. This segmentation allows the sensor to maintain high resolution while managing the overall size through organized modular structure.
Solution Approach 2:
The patent introduces a hierarchical organization with regions, blocks, and pixels across multiple dimensional levels. This multi-dimensional arrangement allows efficient packing of a large number of pixels within a constrained physical area.
2Manufacturing precision
If the array sensor is divided into multiple regions with different driving conditions to reduce sensitivity unevenness, then sensitivity uniformity is improved, but discontinuous voltage changes at region boundaries cause border artifacts in output images
Solution Approach 1:
The bias voltage is made dynamically adjustable within each block based on the block's position and characteristics. This dynamic adjustment allows continuous voltage variation across block boundaries, eliminating the discontinuous jumps that cause border artifacts while maintaining sensitivity uniformity.
Solution Approach 2:
The patent changes the bias voltage parameter continuously across different blocks rather than using discrete step changes. By adjusting the voltage parameter smoothly from one block to the next, the system maintains sensitivity uniformity without creating visible borders in the output image.
3Manufacturing precision
If correction processing is applied to compensate for sensitivity unevenness, then sensitivity uniformity is improved, but temperature fluctuations cause offset deviation and degrade correction accuracy
Solution Approach 1:
The system performs preliminary correction by applying position-dependent bias voltage adjustments to each block before the actual imaging process. This preliminary action compensates for sensitivity unevenness in advance, reducing the burden on subsequent correction processing and improving its accuracy under temperature fluctuations.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors and adjusts bias voltages based on detected sensitivity variations and temperature changes. This feedback loop maintains correction accuracy despite environmental fluctuations by dynamically adapting the compensation parameters.
Data Source
AI summary
An array sensor includes a sensor element array that includes a plurality of sensor elements, a signal processing circuit array that includes a plurality of signal processing circuits coupled to the corresponding sensor elements, and a resistor network that supplies bias voltages to the corresponding signal processing circuits, wherein different voltages are applied to at least two voltage application nodes in the resistor network.