X-ray Detector Light Emission Layer OLED Uniformity
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Solution Overview
Problem
X-ray detectors suffer from phantom images and non-uniform spatial gain, which affect their resolution and ease of production.
Innovation Solution
Incorporating a light emission layer with OLEDs between the scintillator and reflector layers, with a distance of less than 50 µm, to enhance responsivity and prevent phantom images, using a combination of CMOS or CCD light detection and metal shunt lines for improved emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional X-ray detector structure is used, then the device is simple to manufacture, but the spatial gain uniformity is poor and phantom images occur
Solution Approach 1:
The detector is divided into distinct functional layers: scintillator layer, light emission layer (with OLEDs), and reflector layer. This segmentation allows each layer to be optimized independently for its specific function, improving spatial gain uniformity while maintaining manufacturability through modular assembly
Solution Approach 2:
The light emission layer with OLEDs is positioned between the scintillator and reflector layers to preemptively emit light that fills in dark spots before the reflector reflects light. This preliminary action prevents phantom images by ensuring uniform illumination across the detection surface
2Measurement precision
If the distance between scintillator layer and reflector layer is reduced, then the resolution and responsivity improve, but the space for light emission layer is limited
Solution Approach 1:
The OLEDs in the light emission layer are implemented as thin flexible light-emitting elements that can function effectively in the constrained space between the scintillator and reflector layers. This thin-film approach maintains the required small distance (less than 50 µm) for high resolution while still providing sufficient volume for light emission functionality
3Manufacturing precision
If secondary radiation source is added to prevent phantom images, then the spatial uniformity improves, but the device complexity and cost increase
Solution Approach 1:
The light emission layer with OLEDs is merged into the existing detector structure between the scintillator and reflector layers. This integration combines the secondary radiation source function with the existing light detection pathway, improving spatial uniformity without requiring separate additional components or complex assembly procedures
Solution Approach 2:
The light emission layer serves multiple functions: it acts as a secondary radiation source to prevent phantom images, enhances spatial gain uniformity, and works synergistically with the reflector layer to improve overall detector responsivity. This multi-functionality reduces the need for separate components
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 increases the detector's responsivity and resolution while reducing phantom images, making the X-ray detector easier and cheaper to produce with improved modulation transfer function performance.
Implementation Method 1
a scintillator layer which converts incident X-rays into light
Implementation Method 2
a reflector layer for reflecting light generated within the scintillator layer towards the light detection arrangement
Implementation Method 3
The light emission layer comprises an OLED (organic light emitting diode)
Data Source
Figure 1~4
Figure 5~6
AI summary
An X-raydetector (1) is proposed comprising a light detection arrangement (3) such as a CMOS photodetector, a scintillator layer (5) such as a CsI:Tl layer, a reflector layer (9) and a light emission layer (7) interposed betweenthe scintillator layer (5) and the reflector layer (9). The light emission layer (7) may comprise an OLED and may be made with a thickness of less than 50 µm. Thereby, a sensitivity and resolutionofthe X-raydetector may be improved.