Flat Panel Detector Photoelectric Converter Gap Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flat panel X-ray detectors face challenges in achieving high signal-to-noise ratios due to overlapping capacitances and parasitic capacitances, which reduce sensitivity by allowing light leakage through gaps between electrodes, leading to reduced accuracy in data reading.
Innovation Solution
The design incorporates a substrate with intersecting gate and read signal lines, featuring a detection unit with a first and second photoelectric converter, where the first photoelectric converter is positioned close to the substrate and the second photoelectric converter is on the opposite side, both connected to a thin film transistor. A gap region between the second photoelectric converter and other electrodes is covered by the first photoelectric converter, enhancing light utilization and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single photoelectric converter is used, then the device complexity is reduced, but the light utilization efficiency decreases due to gaps between electrodes allowing light leakage
Solution Approach 1:
The photoelectric converter is divided into two separate components: a first photoelectric converter positioned near the substrate and a second photoelectric converter positioned away from the substrate. This segmentation allows each converter to capture light from different directions, eliminating the light leakage problem caused by gaps in a single converter design while maintaining reasonable structural complexity.
Solution Approach 2:
The solution transitions from a single-plane photoelectric converter to a three-dimensional arrangement with converters positioned at different heights relative to the substrate. The first converter is near the substrate and the second converter is away from it, creating vertical dimensionality that enables comprehensive light capture from multiple angles and positions.
2Reliability
If the gap region between the second photoelectric converter and electrodes is increased, then the overlapping capacitance and parasitic capacitance are reduced, but the light collection efficiency decreases
Solution Approach 1:
The light collection function is segmented between two photoelectric converters positioned at different locations. The first converter near the substrate captures light that would otherwise leak through gaps, while the second converter away from the substrate captures light from its position. This segmentation maintains effective light collection without requiring small gaps that would increase capacitance.
Solution Approach 2:
The first photoelectric converter acts as an intermediary element that captures light in the gap region between the substrate and the second converter. This intermediary converter ensures that light which would otherwise be lost in the gap region is captured, maintaining light collection efficiency while allowing sufficient spacing for electrical isolation.
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 configuration improves the utilization of visible light, thereby enhancing the sensitivity and accuracy of the flat panel detector by minimizing noise and signal crosstalk, while maintaining a high signal-to-noise ratio.
Implementation Method 1
the detection unit comprises a first photoelectric converter, a thin film transistor and a second photoelectric converter, the first photoelectric converter is on a side of the thin film transistor close to the substrate, the second photoelectric converter is on a side of the thin film transistor facing away from the substrate
Data Source
AI summary
A flat panel detector includes: a substrate, a gate line and a read signal line define a detection region, a detection unit includes a first photoelectric converter, a thin film transistor and a second photoelectric converter, the first photoelectric converter and the second photoelectric converter are on two side of the thin film transistor and connected with it; a gate electrode layer of the thin film transistor is connected with the gate line, and a source electrode or a drain electrode of the thin film transistor is connected with the read signal line; a gap region is between the second photoelectric converter and at least one selected from a group consisting of the gate line defining the detection unit, the read signal line defining the detection unit and the thin film transistor, and an orthographic projection of the first photoelectric converter on the substrate at least covers the gap region.