Radiation Detector Pixel Architecture for Signal Line Capacity Balancing
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Solution Overview
Problem
Conventional radiation detectors used in radiographic imaging devices face issues with image quality due to significant differences in output signals between detection lines and regular lines, leading to deteriorated image quality and the generation of correction artifacts during image correction for defective lines.
Innovation Solution
A radiation detector design that includes first and second pixels with sensor portions and switching elements, along with radiation detection switching elements, and utilizes scan lines and radiation detection scan lines to manage control signals and charge output, allowing for improved detection of radiation while maintaining image quality by minimizing differences in signal line capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiation detection pixels with short-circuited switching elements are provided to detect radiation irradiation, then radiation detection capability is improved, but signal line capacity difference between detection lines and regular lines increases causing output signal deterioration
Solution Approach 1:
The patent applies local quality by providing radiation detection pixels with short-circuited switching elements only in specific regions where radiation detection is needed, while regular pixels maintain normal switching elements. This localized approach enables radiation detection capability in necessary areas without compromising the overall signal quality across the entire detector array.
Solution Approach 2:
The patent introduces a capacitance correction circuit as an intermediary component that compensates for the capacity difference between detection lines and regular lines. This circuit acts as a mediator to balance the signal characteristics, preventing signal deterioration while maintaining the short-circuited configuration for radiation detection.
2Reliability
If detection lines are treated as defective lines and image correction is carried out, then image quality maintenance is attempted, but correction artifacts are generated in a unique pattern making it difficult to maintain image quality
Solution Approach 1:
The patent applies preliminary action by providing capacitance correction circuits in advance to compensate for capacity differences before signal readout occurs. This preventive approach eliminates the need for post-processing image correction, thereby avoiding the generation of correction artifacts while maintaining image quality.
Solution Approach 2:
The patent converts the harmful effect of capacity difference into a benefit by designing capacitance correction circuits that specifically compensate for the unique capacity characteristics of detection lines. This transforms what would be a source of artifacts into an opportunity for optimized signal correction at the hardware level.
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 design enables effective detection of radiation irradiation while maintaining the quality of radiographic images by reducing signal line capacity differences and preventing artifacts, thus ensuring consistent and accurate image capture.
Implementation Method 1
a first sensor portion that generates charges in accordance with irradiated radiation
Data Source
AI summary
The present invention provides radiation detector, radiographic imaging device and radiographic imaging system that may detect irradiated radiation while maintaining quality of radiographic image. The radiation detector has: pixels having a sensor portion that generates charges in accordance with light converted from irradiated radiation, TFT switch that outputs, to a signal line, charges read-out from the sensor portion, and radiation detection TFT switch that is not connected to a signal line; and radiation detection pixels that have the sensor portion, the TFT switch, and radiation detection TFT switch that is connected to a signal line and that outputs, to the signal line, charges read-out from the sensor portion. The radiation detection TFT switches are connected to radiation detection scan lines, and ON/OFF states are controlled by scan signals that are outputted from a radiation detection control circuit.