Imaging Device Column Circuit Bias Voltage Equalization
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Solution Overview
Problem
Existing imaging devices with vertical lines connected to pixels in column signal lines experience image quality degradation during signal read operations due to differences in bias voltages between column signal lines.
Innovation Solution
Incorporating a switch between control lines to equalize bias voltages across column signal lines, allowing for various operation modes while reducing image quality deterioration by ensuring consistent current values and voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signals are read from column signal lines in various operation modes, then operational versatility is improved, but image quality deteriorates due to bias voltage differences
Solution Approach 1:
The patent applies equipotentiality by providing a common power supply line that supplies power to multiple column signal lines, ensuring that all column signal lines have the same power supply potential. This eliminates bias voltage differences between column signal lines, allowing various operation modes to be implemented without image quality degradation.
2Adaptability or versatility
If separate control lines are provided for each column circuit, then operational flexibility is improved, but voltage uniformity deteriorates
Solution Approach 1:
The patent maintains separate control lines for each column circuit to preserve operational flexibility, while simultaneously providing a common power supply line that ensures all column signal lines have uniform power supply potential, thus maintaining voltage uniformity across different control configurations.
Solution Approach 2:
The patent segments the control function by providing separate control lines for each column circuit, allowing independent control of different columns. At the same time, the power supply function is unified through a common power supply line, ensuring voltage uniformity across all segmented control lines.
3Speed
If current values in column signal lines are not equalized, then operation speed is improved, but image quality deteriorates
Solution Approach 1:
The patent ensures equal current values in column signal lines by providing a common power supply line that maintains uniform power supply potential across all columns. This allows high-speed signal reading while preventing image quality deterioration caused by current mismatches between columns.
Data Source
AI summary
An imaging device according to the present disclosure is provided with: a pixel array having a plurality of pixels arranged in a matrix and outputting pixel signals corresponding to the amount of light received; a first column signal line and a second column signal line respectively provided corresponding to the columns of the pixel array; a first column circuit connected to the first column signal line; a second column circuit connected to the second column signal line; a first control line for controlling the first column circuit; a second control line for controlling the second column circuit; and a plurality of switches provided between the first control line and the second control line, and are controlled by a common signal.