Electromagnetic wave detector
AssigneeCanon Kabushiki Kaisha
InventorMasakazu Morishita
Life of this patent
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Abstract
An electromagnetic wave detector includes a conversion element for converting incident electromagnetic waves or high energy radiations into an electric charge, a storage capacitor for storing the electric charge produced by the conversion element, a thin film read transistor connected to the storage capacitor, and a thin film reset transistor also connected to the storage capacitor. To the gates of the read and reset thin film transistors are applied ON and OFF voltages at predetermined timings and these voltages are set to values such that any excessive electric charge produced in the storage period is discharged by way of the thin film reset transistor, not by way of the thin film read transistor, in the same storage period.
Claims16
An electromagnetic wave detector comprising:
- conversion elements for converting incident electromagnetic waves or radiations into an electric charge;
- storage capacitors for storing the electric charge produced by said conversion elements;
- thin film read transistors connected respectively to the corresponding storage capacitors, each of said read transistors having a threshold voltage and a gate to which first and second voltages are applied respectively in readout and storage periods, wherein said first voltage is higher than said threshold voltage of said read transistor;
- and
- thin film reset transistors connected respectively to the corresponding storage capacitors, each of said reset transistors having a threshold voltage and a gate to which third and fourth voltages are applied respectively in reset and storage periods wherein said third voltage is higher than said threshold voltage of said reset transistor, and
- wherein a gate potential of said read transistors and a gate potential of said reset transistors can be independently controlled, and the difference between the fourth voltage and the threshold voltage of said reset transistors is smaller than the difference between the second voltage and the threshold voltage of said read transistors.
An electromagnetic wave detector comprising:
- conversion elements for converting incident electromagnetic waves or radiations into an electric charge;
- storage capacitors for storing the electric charge produced by said conversion elements;
- and
- thin film reset transistors connected respectively to the corresponding storage capacitors and each having a gate to which first and second voltages are applied respectively in reset and storage periods,
- wherein any excessive electric charge is discharged by way of said thin film reset transistors in each storage period.
Dependencies are inferred from the claim text.