Flat panel detector for radiation imaging with reduced...

H - Electricity – 01 – L

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H01L 27/146 (2006.01) G01T 1/24 (2006.01) G01T 1/29 (2006.01) H04N 5/32 (2006.01)

Patent

CA 2228116

A flat panel detector (20) for radiation imaging includes an array of transistor switches (38) each of which is associated with a pixel electrode (36). A radiation transducer (CSE) including a top electrode (72) and a radiation conversion layer (70) is disposed over the array. Means are positioned over dead zones between adjacent pixel electrodes to inhibit the accumulation of charge in the radiation conversion layer at the dead zones when the top electrode is biased and the flat panel detector is exposed to radiation. In one embodiment, the inhibiting means is constituted by islands (64) formed of semiconductor material between the array and the radiation transducer. Each island is positioned over a dead zone between adjacent pixel electrodes and contacts a pixel electrode to allow charges accumulated on the islands to drift to the pixel electrodes.

Détecteur de panneau (20) de radiographie comprenant un ensemble de commutateurs à transistor (38) dont chacun est associé à une électrode de pixel (36). Un transducteur de rayonnement (C¿SE?) comprenant une électrode supérieure (72) et une couche de conversion de rayonnement (70) est placé sur l'ensemble. Des dispositifs sont placés sur les zones mortes comprises entre les électrodes de pixels contiguës pour empêcher l'accumulation de charges dans la couche de conversion de rayonnement au niveau de ces zones mortes lorsque l'électrode supérieure est excitée et que le détecteur de panneau est exposé au rayonnement. Selon l'un des modes de réalisation, le dispositif inhibiteur consiste en une série d'ilôts (64) constitués d'un matériau semiconducteur placé entre l'ensemble et le transducteur de rayonnement. Chaque ilôt est positionné au-dessus d'une zone morte entre les électrodes de pixels contiguës et reste au contact de l'électrode de pixels pour permettre aux charges accumulées sur les îlots de dériver en direction de ces électrodes.

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