Photo-detecting Pixel Readout Speed via Transistor Current Path Control
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Solution Overview
Problem
Current photo-detecting apparatuses, such as X-ray detectors, face challenges in reducing the time required to read out detection signals, which limits their frame rate and efficiency in capturing images.
Innovation Solution
The proposed solution involves a photo-detecting pixel structure that includes a photosensitive device, transistors to form and manage current paths, and a method of driving the apparatus to concurrently form and block current paths across multiple pixels, allowing for simultaneous delivery of detection signals to data lines, thereby reducing readout time and increasing frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional photo-detecting apparatus structures are used, then the device complexity is maintained at acceptable levels, but the readout time is too long which limits the frame rate
Solution Approach 1:
The photo-detecting pixel is divided into multiple functional blocks: photosensitive device for signal generation, first transistor for current generation, second transistor for current path formation, and third transistor for signal delivery. This segmentation allows each component to perform its function efficiently, reducing overall readout time while maintaining manageable complexity through modular design
Solution Approach 2:
The first transistor generates the detection current in advance by photoelectrically converting incident light before the readout process begins. The second transistor is prepared to form the current path when needed. This preliminary action ensures that when the third transistor delivers the signal, the detection is already complete, reducing readout time
2Productivity
If the readout time is reduced by optimizing the pixel structure, then the frame rate is improved, but the device complexity increases due to additional transistors and current paths
Solution Approach 1:
The second transistor serves multiple functions: it forms the current path when activated by the read signal, and it can be controlled to block or enable signal flow. This multi-functionality reduces the need for separate dedicated components, improving frame rate while limiting the increase in device complexity
Solution Approach 2:
The second transistor dynamically forms and blocks the first current path based on the read signal input. This dynamic control allows the device to switch between different operational states efficiently, improving productivity while using a compact structure that doesn't excessively increase complexity
3Speed
If multiple transistors are used to manage current paths, then the detection signal readout speed is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Each transistor is designed with specific local characteristics optimized for its function: the first transistor for photoelectric conversion, the second for dynamic path control, and the third for signal delivery. This local optimization allows each component to meet precision requirements for its specific role while contributing to overall fast readout speed
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
This approach significantly decreases the time needed to read out detection signals, enhancing the frame rate of the photo-detecting apparatus, enabling faster image capture and improved performance in applications like medical and non-destructive examinations.
Implementation Method 1
a photosensitive device for generating a first detection signal by photoelectrically converting incident light
Data Source
AI summary
A photo-detecting apparatus in which the time taken to read out a detection signal is decreased, and thus, a frame rate of the photo-detecting apparatus is improved. A photo-detecting pixel includes a photosensitive device for generating a first detection signal by photoelectrically converting incident light; a first transistor for generating a detection current by receiving the first detection signal generated by the photosensitive device via a gate terminal of the first transistor; a second transistor for forming a first current path with the first transistor, in response to a read signal input via a gate terminal of the second transistor; and a third transistor for delivering a voltage in accordance with the detection current to a data line, in response to a gate signal applied to a gate terminal of the third transistor.