Flat-Panel Detector Substrate Segmented Photoelectric Conversion
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Solution Overview
Problem
Existing X-ray digital imaging technologies face challenges in improving radiation resistance and extending the service life of flat-panel detectors without increasing the thickness of scintillator layers, which affects their performance and signal-to-noise ratio.
Innovation Solution
A detection substrate with a layered structure comprising transistors, a photoelectric conversion section with a radiation sensitive layer and a photosensitive unit, and a scintillator layer, where the radiation sensitive layer absorbs X-rays and the photosensitive unit converts visible light into carriers, enhancing radiation resistance and service life while maintaining the spatial modulation transfer function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of scintillator layer is increased to improve radiation resistance, then the radiation resistance is improved, but the signal-to-noise ratio deteriorates
Solution Approach 1:
The photoelectric conversion layer is segmented into two distinct functional layers: a scintillator layer for absorbing X-rays and converting them to visible light, and a radiation-sensitive layer for absorbing remaining X-rays and converting them to electrical signals. This segmentation allows each layer to be optimized independently - the scintillator layer can be made thinner to maintain signal quality while the radiation-sensitive layer provides the necessary radiation protection and signal conversion.
Solution Approach 2:
The patent employs composite material structure by combining different materials with complementary properties: the scintillator layer uses materials with high light conversion efficiency, while the radiation-sensitive layer uses materials with appropriate atomic numbers and band gaps to absorb X-rays effectively. This composite approach achieves radiation resistance without requiring excessive thickness of any single layer.
2Duration of action of stationary object
If the thickness of scintillator layer is increased to extend service life, then the service life is extended, but the spatial modulation transfer function deteriorates
Solution Approach 1:
By dividing the photoelectric conversion function into two separate layers, the patent enables the scintillator layer to be optimized for light conversion efficiency (maintaining spatial resolution) while the radiation-sensitive layer provides durability and signal conversion. This segmentation allows the scintillator layer to remain thin, preserving the spatial modulation transfer function, while the overall structure achieves extended service life through the protective radiation-sensitive layer.
3Device complexity
If a single-layer photoelectric conversion structure is used to simplify device complexity, then the device complexity is reduced, but the radiation resistance deteriorates
Solution Approach 1:
The patent divides the photoelectric conversion structure into two specialized layers: the scintillator layer that converts X-rays to visible light, and the radiation-sensitive layer that converts both X-rays and visible light to electrical signals. This segmentation, while adding structural complexity, actually simplifies the overall design by allowing each layer to be independently optimized for its specific function, achieving better radiation resistance without requiring a single overly complex thick layer.
Solution Approach 2:
The radiation-sensitive layer serves multiple functions: it absorbs remaining X-rays that pass through the scintillator layer, converts visible light from the scintillator to electrical signals, and provides additional radiation protection. This multi-functionality achieves improved radiation resistance without proportionally increasing device complexity, as one layer performs multiple critical roles.
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 improves radiation resistance and extends the service life of flat-panel detectors by preventing unabsorbed X-rays from reaching transistors and photosensitive units, thereby increasing the signal-to-noise ratio and maintaining the spatial modulation transfer function without increasing the scintillator layer thickness.
Implementation Method 1
a scintillator layer 3, wherein the photoelectric conversion section is disposed between the transistor 11 and the scintillator layer 3
Implementation Method 2
the radiation sensitive layer is configured to absorb rays and convert the rays into carriers
Implementation Method 3
the photosensitive unit is configured to at least absorb visible light and convert the visible light into carriers
Data Source
AI summary
A detection substrate and a flat-panel detector, and relates to the technical field of photoelectric detection. The detection substrate can improve radiation resistance and prolong a service life without increasing the thickness of a scintillator layer. The detection substrate includes a plurality of detection pixel units arranged in an array. Each of the detection pixel units includes: a transistor, a photoelectric conversion section, and a scintillator layer, with the photoelectric conversion section disposed between the transistor and the scintillator layer, the photoelectric conversion section includes a radiation sensitive layer and a photosensitive unit, which are laminated in arrangement; the radiation sensitive layer is configured to absorb rays and convert the rays into carriers; and the photosensitive unit is configured to at least absorb visible light and convert the visible light into carriers. The present disclosure is applicable to the production of the detection substrates.