Solid-State Imaging Device Non-Periodic Sampling Noise Control
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Solution Overview
Problem
Existing solid-state electronic imaging devices suffer from periodic noise that affects the quality of captured images, which is not adequately addressed by existing techniques.
Innovation Solution
A solid-state electronic imaging device with a pulse output circuit, amplification circuit, reference signal output circuit, and sampling circuits that control the timing and levels of reference signals to non-periodically sample analog signals, reducing periodic noise by adjusting the output timing and levels of reset and read pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic horizontal synchronizing signal is used to control reset and read pulses, then timing synchronization is improved, but periodic noise is generated in the captured image
Solution Approach 1:
The patent applies periodic action by using periodic horizontal synchronizing signals to control the timing of reset and read pulses, while intentionally introducing non-periodic variations in the sampling timing to break the periodic noise pattern while maintaining synchronization functionality
Solution Approach 2:
The patent changes the timing parameter of the sampling operation by introducing non-periodic timing variations in the sampling of analog signals, while maintaining the periodic horizontal synchronizing signal for pulse control, thereby altering the noise characteristics without losing synchronization
2Device complexity
If sampling is performed at fixed periodic intervals, then processing simplicity is improved, but periodic noise becomes visible in the image
Solution Approach 1:
The patent introduces dynamic timing variation by making the sampling timing non-periodic while maintaining periodic control signals, creating a dynamic system that adapts timing to prevent noise patterns while preserving the overall periodic structure for synchronization
3Object-generated harmful factors
If non-periodic sampling is implemented, then periodic noise is reduced, but processing complexity increases
Solution Approach 1:
The patent segments the sampling process into two distinct parts: periodic pulse control for resetting and reading signals, and non-periodic sampling for analog signal acquisition, allowing each part to be optimized independently for its specific 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 effectively prevents the generation of periodic noise in captured images, making it invisible and improving image quality.
Implementation Method 1
a plurality of photoelectric conversion elements that are arranged in a row direction and a column direction
Data Source
AI summary
Provided are a solid-state electronic imaging device that makes periodic noise invisible and a method for controlling the solid-state electronic imaging device. In a solid-state electronic imaging device in which a plurality of photoelectric conversion elements are arranged, a second ramp wave whose level decreases for a second sampling period from the output of a read pulse for reading signal charge accumulated in the photoelectric conversion elements to the output of a reset pulse for resetting the signal charge accumulated in the photoelectric conversion elements is output. In a case in which the level of the second ramp wave is a second reference level, a second sampling pulse is output and a voltage signal converted from the signal charge is sampled. The sampling interval is non-periodic. Even in a case in which periodic noise has an effect on the solid-state electronic imaging device, it is possible to exclude the periodic noise from an object image obtained by imaging.