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A new and novel detector structure is now being investigated to minimize the readout noise of large area
TFT arrays. A conventional TFT panel consists of orthogonal arrays of gate lines and data lines. The
parasitic capacitance from the crossover of these lines results in a sizable data line capacitance. During
image readout, the thermal noise of the charge integrator is greatly magnified by the ratio of the data line
capacitance to the feedback capacitance of the charge amplifier. The swinging of the gate voltage will
also inject charges in and out of the imaging holding pixel capacitors and contribute to the switching noise
in the readout image. By redesigning the layout of the TFT arrays and by coupling linear light source to
the bottom side of the TFT array in the same direction as the gate lines, the crossover of gate lines and
data lines can be avoided and the data line capacitance can be greatly reduced. Instead of addressing
each row of transistors by the switching of the gate control voltage, linear light source with collimators are
used to optically switch on and off the amorphous silicon transistors. The transistor switching noise from
the swinging of the gate voltages is reduced. By minimizing the data line capacitance and avoiding the
swinging of the gate control voltage, the basic TFT readout noise is minimized and lower dose x-rays
images can be obtained. This design is applicable to both Direct Conversion and
Indirect Conversion panels.
Denny Lee
"Low-noise thin-film transistor array for digital x-ray imaging
detectors", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79610R (16 March 2011); https://doi.org/10.1117/12.877900
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Denny Lee, "Low-noise thin-film transistor array for digital x-ray imaging detectors," Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79610R (16 March 2011); https://doi.org/10.1117/12.877900