Dynamic X-Ray Panel Line Timing for Ghost-Free High Frame Imaging
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Solution Overview
Problem
Conventional X-ray detectors experience time delays and ghost images due to the sequential processing of global reset, window time, and readout steps, which are not suitable for high frame rate dynamic imaging applications.
Innovation Solution
A dynamic X-ray detecting panel with a method of driving that includes a matrix of pixels with readout and reset thin film transistors, where line reset, window time, and readout proceed for each row, allowing for overlapping and optimized timing to prevent time delays, with specific connections for readout and reset pads to reduce RC delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential global reset, window time and readout steps are used for all pixels, then the reading process is simplified, but time delay occurs in each line between window time and readout causing image lag and ghost images
Solution Approach 1:
The pixel array is divided into multiple rows, and the reading process is segmented into line-by-line operations. Each row has dedicated readout TFTs that are controlled independently, allowing sequential reading of different rows without affecting the imaging timing of other rows. This segmentation eliminates the time delay between window time and readout for each line by processing rows in a coordinated manner.
2Loss of time
If sequential line-by-line reading is performed, then time delay between window time and readout is reduced, but the reading process becomes more complex
Solution Approach 1:
The readout TFTs for each row are pre-configured with appropriate gate voltages before the imaging process begins. During operation, the gate voltages are switched to enable or disable reading for specific rows without requiring complex real-time control logic. This preliminary configuration simplifies the overall control mechanism while enabling precise timing control for each line.
3Productivity
If high frame rate imaging is implemented, then dynamic imaging capability is improved, but image lag and ghost images occur due to time delay
Solution Approach 1:
The imaging process maintains continuous operation by overlapping the window time of one row with the readout process of the previous row. While one row is being read out, the next row is already accumulating charge during its window time. This continuous overlapping eliminates idle time between rows and prevents image lag, enabling high frame rate imaging without sacrificing image quality.
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 approach enables the acquisition of high frame rate X-ray images without image lag or ghost images, suitable for dynamic imaging applications by synchronizing the operations across rows and columns.
Implementation Method 1
The X-ray detecting panel may detect visible light through a scintillator by converting X-ray to visible light
Data Source
AI summary
A dynamic X-ray detecting panel, an X-ray detector including the same, and a method of driving an X-ray detector are disclosed. The method of driving the X-ray detector is a method of driving a dynamic X-ray detector including the X-ray detecting panel. The X-ray detecting panel includes multiple pixels arranged in a matrix, each of the pixels includes a readout thin film transistor, a reset thin film transistor, and a photodiode, and line reset, window time, and readout proceed with respect to the multiple pixels in each row.