Radiation detection panel and method of manufacturing the same
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Solution Overview
Problem
Existing radiation detectors, particularly X-ray detectors, face issues with image quality degradation due to the formation of a light reflective layer with a periodic uneven surface, which detects irregularities as image artifacts, and are prone to deformation and damage from mechanical stress during manufacturing.
Innovation Solution
A radiation detection panel is manufactured with a light reflective layer composed of adhesive and light scattering particles, where the layer's surface is formed with random protrusions and recesses to enhance fluorescence reflection efficiency and reduce mechanical stress, using a method that involves spraying a mixture of adhesive, light scattering particles, and solvent onto the scintillator layer and drying it to form a random uneven surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light reflective layer with a periodic uneven surface is formed by applying mixture material with a dispenser, then the layer provides fluorescence reflection function, but it detects irregularities as image artifacts degrading image quality
Solution Approach 1:
The patent applies the asymmetry principle by changing the light reflective layer surface from a periodic uneven pattern to a random uneven pattern. The random protrusions and recesses are formed with non-uniform spacing and random orientations, which prevents the formation of regular image artifacts while maintaining effective fluorescence reflection toward the photoelectric conversion units.
Solution Approach 2:
The patent applies parameter changes by modifying the surface topology parameters of the light reflective layer. Instead of periodic structures with fixed spacing and orientation, the invention uses random structures where protrusion height, spacing, and orientation vary statistically, eliminating the periodicity that causes image artifacts.
2Ease of manufacture
If a light reflective layer is formed by applying and drying mixture material, then the layer structure is formed, but mechanical stress during manufacturing causes deformation and damage
Solution Approach 1:
The random uneven surface structure distributes mechanical stress more uniformly across the layer compared to periodic structures. The irregular arrangement of protrusions and recesses prevents stress concentration at regular intervals, reducing the likelihood of deformation and damage during manufacturing processes.
Solution Approach 2:
By changing the surface topology from periodic to random, the patent alters the mechanical stress distribution characteristics. The random structure with varying protrusion heights and spacing creates a more compliant surface that can better accommodate manufacturing-induced stresses without deforming or damaging the underlying scintillator layer.
3Reliability
If the light reflective layer has a random uneven surface with random protrusions and recesses, then fluorescence reflection efficiency is enhanced and mechanical stress is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies self-service by allowing the mixture material to form the random uneven surface structure automatically during the drying process. The capillary action and surface tension effects during solvent evaporation naturally create the random protrusions and recesses without requiring complex external patterning equipment or multiple processing steps.
Solution Approach 2:
The patent replaces complex mechanical patterning systems with a chemical-physical self-organization process. Instead of using lithography or mechanical stamping to create the uneven surface, the invention relies on the spontaneous formation of random structures during the drying of the mixture material, substituting a simple coating and drying process for complex manufacturing equipment.
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 image quality by enhancing fluorescence reflection and reduces mechanical stress, leading to a more robust and efficient radiation detection panel with improved sensitivity and reduced deformation.
Implementation Method 1
a scintillator layer provided on the photoelectric conversion substrate, and converting radiation into fluorescence
Implementation Method 2
a light reflective layer provided on the other surface, formed of an adhesive and light scattering particles, and reflecting fluorescence generated in the scintillator layer toward the plurality of photoelectric conversion units
Implementation Method 3
a photoelectric conversion substrate including a plurality of photoelectric conversion units converting fluorescence into electric signals
Data Source
AI summary
According to one embodiment, a radiation detection panel includes a photoelectric conversion substrate, a scintillator layer, and a light reflective layer formed of an adhesive and light scattering particles. The light reflective layer has an uneven surface. The uneven surface includes surfaces of a plurality of protruding protrusions and a surface of a recess portion. An interval from each of the plurality of protruding portions to the adjacent protruding portion is random.