Oxide Semiconductor Photodetector Noise Removal by Difference Data
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Solution Overview
Problem
Conventional photodetectors suffer from significant noise variations, including random and fixed pattern noise, which affect the accuracy of data capture, especially in small devices like mobile phones where the light-receiving area is limited, leading to adverse effects from leakage current and noise.
Innovation Solution
A photodetector system comprising a photodetector circuit, a difference data generation circuit, and a data input selection circuit that generates difference data by subtracting optical data signals from two distinct periods, effectively removing noise components and improving data quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light-receiving area of a photodetector circuit is reduced to make the device smaller, then the device size is reduced, but the adverse effects of leakage current and noise become more significant
Solution Approach 1:
The patent extracts and removes the harmful noise components from the optical data signal by generating difference data between two periods. The difference data generation circuit subtracts the signal from a first period from the signal of a second period, effectively extracting and eliminating noise while preserving the useful optical data.
Solution Approach 2:
The patent performs preliminary noise removal by generating difference data before final data output. The system proactively captures and processes signals from two different periods, calculating the difference to preemptively eliminate noise effects before the data is used, rather than attempting to filter noise after it has degraded the signal.
2Object-affected harmful factors
If difference data generation circuit is added to remove noise, then noise resistance is improved, but device complexity increases
Solution Approach 1:
The patent merges the noise removal function with the existing photodetector circuit operations. The difference data generation circuit is integrated into the signal processing pipeline, combining the noise elimination capability with the data capture and output functions already present in the photodetector system, thereby reducing overall complexity.
Solution Approach 2:
The difference data generation circuit serves multiple functions: it removes noise, preserves optical data, and can be applied to various photodetector configurations. This multi-functional approach allows a single circuit addition to address multiple requirements simultaneously, improving noise resistance without proportionally increasing complexity.
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 proposed solution reduces noise-related adverse effects, enhances data accuracy, and improves the quality of captured images by isolating noise components from the data, thereby increasing the aperture ratio and reducing the number of elements required in the photodetector circuit.
Implementation Method 1
a photodetector circuit PS having a function of generating an optical data signal
Data Source
AI summary
Adverse effects of noise are reduced. A photodetector circuit, a difference data generation circuit, and a data input selection circuit are included. The photodetector circuit has a function of generating an optical data signal. A first data signal and a second data signal is input to the difference data generation circuit and the difference data generation circuit has a function of generating difference data of data of the first data signal and data of the second data signal. The data input selection circuit has a function of determining that the data of optical data signal is regarded as data of the first data signal or data of the second data signal.