Radiation Imaging Shift Circuit for Dead-Period-Free Detection
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Solution Overview
Problem
In radiation imaging apparatuses using Flat Panel Detectors, when the number of output terminals in the scanning circuit exceeds the number of scanning lines, it leads to delayed detection of the start of radiation irradiation, as signals from radiation detection elements cannot be obtained during the output of activation signals from unconnected output terminals.
Innovation Solution
The radiation imaging apparatus includes a drive circuit with a shift register that sequentially outputs activation signals from a plurality of terminals, with a first terminal group connected to drive lines and a second terminal group not connected. The drive controller supplies a second start signal before the shift operation according to the first start signal ends, allowing the activation signal to be output from the second terminal first, followed by the first terminal, thereby eliminating dead periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a general-purpose scanning circuit is used with more output terminals than scanning lines, then device complexity is reduced, but detection precision of radiation irradiation start is worsened due to dead periods
Solution Approach 1:
The drive controller supplies a second start signal before the shift operation according to the first start signal ends, so that the shift operation according to the second start signal starts in advance. This preliminary action ensures that when the activation signal output from the unconnected second terminal group would create a dead period, another activation signal is already being output from the connected first terminal group, thus maintaining continuous detection capability without increasing circuit complexity
Solution Approach 2:
By overlapping the shift operations through supplying the second start signal before the first shift operation ends, the system ensures continuous output of activation signals to the connected scanning lines. This eliminates dead periods where no activation signal is output, maintaining continuous useful action for radiation detection without requiring additional terminals or complex circuitry
2Ease of operation
If the shift operation continues until all terminals output activation signals, then device operation is simplified, but loss of time occurs due to dead periods when unconnected terminals are outputting
Solution Approach 1:
The drive controller supplies the second start signal before the first shift operation ends, initiating the second shift operation in advance. This preliminary action overlaps the two shift operations in time, ensuring that when the first shift operation reaches the unconnected second terminal group and creates a dead period, the second shift operation is already outputting activation signals from connected terminals, thus eliminating detection delay without complicating the operation
Solution Approach 2:
The overlapping shift operations ensure that activation signals are continuously output to the connected scanning lines without interruption. By timing the second start signal supply to overlap with the end of the first shift operation, the system eliminates dead periods and maintains continuous useful action for radiation detection, reducing time loss while keeping the operation simple
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 solution enables the radiation imaging apparatus to reliably and quickly detect the start of radiation irradiation by eliminating dead periods and ensuring continuous detection of bias currents, thus improving the responsiveness of the imaging apparatus.
Implementation Method 1
the drive circuit performs a shift operation of sequentially outputting an activation signal from each of the plurality of terminals one by one in accordance with a shift clock
Implementation Method 2
a plurality of pixels arranged to form a plurality of rows and a plurality of columns... signals output from the plurality of pixels
Data Source
AI summary
A radiation imaging apparatus comprising pixels, a driver controlling the pixels via drive lines and a controller, is provided. The driver comprises terminals and performs a shift operation of sequentially outputting an activation signal from each of the terminals in response to first and second signals supplied from the controller. The terminals include a first group that is connected to the drive lines and a second group that is not connected to the drive lines. The first group includes a first terminal output the activation signal first and a second terminal output the activation signal at last. During detecting a start of irradiation, the driver outputs the activation signal from the second terminal in the shift operation according to the first signal and then outputs the activation signal from the first terminal in the shift operation according to the second signal.