X-ray Detection Panel Simultaneous Forward-Biasing and Initialization
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Solution Overview
Problem
Conventional X-ray detection devices face challenges in performing forward-biasing and initializing operations simultaneously across all pixel circuits without decreasing fill-factor and frame-rate, particularly in large-sized flat panel X-ray detection devices.
Innovation Solution
An X-ray detection device with a gate driving circuit, readout integrated circuit, bias driving circuit, and operation control circuit that simultaneously performs forward-biasing and initializing operations on all pixel circuits, using a combination of transistors and voltage controllers to manage gate, data, and bias lines, allowing for simultaneous turn-on and turn-off of transistors during different operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional transistors are included in each pixel circuit for forward-biasing the diode, then the forward-biasing operation can be performed, but the fill-factor decreases and noise due to line capacitance increases
Solution Approach 1:
The patent divides the forward-biasing control into separate segments: the gate driving circuit provides forward-bias voltage through gate-lines to turn on switching transistors, while bias driving circuits provide forward-bias voltage through bias-lines independently. This segmentation eliminates the need for additional transistors within each pixel circuit, maintaining fill-factor while achieving forward-biasing capability.
Solution Approach 2:
The gate-lines and gate driving circuit are designed to serve multiple functions: they control the switching transistors for signal readout during normal operation and simultaneously provide forward-bias voltage to all pixel circuits during forward-biasing operation. This multi-functionality eliminates the need for dedicated additional transistors, resolving the fill-factor contradiction.
2Reliability
If each pixel circuit alternately performs X-ray detecting operation and forward-biasing operation for each gate-line, then forward-biasing can be achieved, but the frame-rate necessarily decreases
Solution Approach 1:
The patent implements periodic action by alternating between forward-biasing periods and X-ray detection periods at the panel level. During forward-biasing periods, all pixel circuits are simultaneously forward-biased through gate-lines and bias-lines. During detection periods, the same circuits sequentially readout signals from all pixel circuits. This periodic switching enables simultaneous forward-biasing of all pixel circuits without reducing frame-rate, as the entire panel transitions between states rather than individual pixel circuits.
3Reliability
If forward-biasing and initializing operations are performed sequentially on pixel circuits, then operations can be completed, but image-lag reduction efficiency decreases
Solution Approach 1:
The patent merges the forward-biasing and initializing operations into a single integrated process. The gate driving circuit simultaneously provides forward-bias voltage to turn on switching transistors, while bias driving circuits provide appropriate voltages through bias-lines. The readout integrated circuit then readsout signals from all pixel circuits in sequence. This merging allows both operations to be performed on all pixel circuits simultaneously rather than sequentially, reducing total operation time and improving image-lag reduction efficiency.
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 efficiently reduces image-lag without fill-factor decreases and frame-rate reductions, enabling effective X-ray detection while maintaining high performance across all pixel circuits.
Implementation Method 1
each pixel circuit includes a switching transistor having a gate terminal coupled to one of the gate-lines and a first terminal coupled to one of the data-lines, and a diode having a cathode coupled to a second terminal of the switching transistor and an anode coupled to one of the bias-lines. the diode may receive an X-ray to generate charges corresponding to the detection signal
Implementation Method 2
the diode may receive a visible-ray to generate charges corresponding to the detection signal when an X-ray is converted to the visible-ray by a scintillator
Data Source
AI summary
An X-ray detection device includes an X-ray detection panel having a plurality of gate-lines, a plurality of data-lines, a plurality of bias-lines, a plurality of pixel circuits, a gate driving circuit that sequentially provides a gate signal to the pixel circuits via the gate-lines when an X-ray detecting operation is performed, a readout integrated circuit that performs a readout operation of a detection signal that is output from the pixel circuits via the data-lines when the X-ray detecting operation is performed, a bias driving circuit that provides a forward-bias voltage or a reverse-bias voltage to the pixel circuits via the bias-lines, and an operation control circuit that controls a forward-biasing operation and an initializing operation to be simultaneously performed on the pixel circuits.