Digital Detector Light Generator Electrode Segmentation
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Solution Overview
Problem
Current solid-state X-radiation detectors face issues with non-uniform light distribution during reinitialization, leading to inefficiencies and increased electrical consumption, particularly in large-area detectors where OLED layers with ITO electrodes suffer from brightness variations and 'Grid Effect' due to movement during medical imaging.
Innovation Solution
A digital detector design with a light generator featuring additional electrical conductors distributed on the electrode surface to enhance conductivity and uniformity, reducing luminosity drops and improving light homogeneity across the detector surface, and optionally using a transparent or semi-transparent electrode to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a light generator using OLED layer with ITO electrode is used for optical wiping, then the detector can be reinitialized, but the light distribution becomes non-uniform causing brightness variations and Grid Effect
Solution Approach 1:
The electrode is segmented into multiple conductive zones by introducing additional electrical conductors that divide the continuous ITO electrode into separate regions. This segmentation allows independent control and optimization of light emission in different areas, correcting the non-uniform brightness distribution and eliminating the Grid Effect while maintaining effective optical wiping across the entire detector surface.
2Area of stationary object
If the detector area is increased for large-area coverage, then more radiation can be detected, but the light homogeneity deteriorates due to OLED layer limitations
Solution Approach 1:
The solution transitions from a single-layer OLED structure to a multi-layer configuration by adding additional electrical conductors that create vertical and horizontal conductive pathways. This dimensional expansion allows light to be distributed more uniformly across large areas by providing multiple routes for electrical current and light emission, overcoming the inherent limitations of planar OLED layers in large-area applications.
3Illumination intensity
If additional electrical conductors are added to the electrode, then light homogeneity improves, but device complexity increases
Solution Approach 1:
The additional electrical conductors are merged with the existing ITO electrode structure, combining multiple functions into a unified design. The conductors serve dual purposes: they provide electrical pathways for uniform light distribution and act as structural support elements. This merging approach improves light homogeneity while minimizing the increase in device complexity by integrating rather than adding 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 achieves greater than 80% spatial light homogeneity and reduced electrical consumption, enabling efficient and uniform light distribution for large-area detectors, thus improving image quality and detector performance.
Implementation Method 1
a light generator (14) arranged downstream of the substrate (15) and suitable for emitting a flash of light for optically erasing the photosensitive elements (16)
Implementation Method 2
a scintillator (12) making it possible to convert the X radiation (11) in visible radiation
Implementation Method 3
The light emitted by the radiation converter illuminates the photosensitive elements of the sensor which carry out a photoelectric conversion and deliver electrical signals
Data Source
Figure 1a~2a
Figure 2b
Figure 3~4
AI summary
The present invention relates to a solid-state radiation detector (10) including a photosensitive sensor (13) comprising photosensitive elements (16) organized into a matrix, and a generator (14) of light intended to optically wipe the photosensitive elements (16). According to the invention, the generator (14) of light comprises: a light-emitting layer (21) distributed over the surface of the sensor (13); at least one electrode (22, 23) continuously covering the light-emitting layer (21) and through which electrons are able to flow, the light emitted by the light-emitting layer (21) being able to pass through the electrode (22, 23); and additional electrical conductors (24, 36) making electrical contact with the electrode (22, 23), the additional electrical conductors (24, 36) forming branches extending over the surface of the electrode (22, 23), and being spatially distributed over the surface of the electrode (22, 23).