Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Anthony Roy Franklin

Martin John Powell

Michael Overdick

Walter Ruetten

Tiemen Poorter

Augusto Nascetti

Carl Glasse

Falko Busse

Lex Alving

An Y-ray detector apparatus comprises an array of detector pixels arranged into a plurality of sub-arrays. The pixels in each sub-array share a common dose sensing output provided to a dose sensing output conductor which extends to a periphery of the pixel array. The dose sensing output conductor for one sub-array of pixels passes through the area occupied by another sub-array of pixels, which can lead to unwanted cross talk. The invention provides a plurality of additional screening electrodes, with a screening electrode substantially adjacent the dose sensing output conductor for each sub-array of pixels. These screening electrodes reduce cross talk between the dose sensing output and other pixel electrodes. In another arrangement, each pixel further comprises a pixel electrode for each pixel formed at an upper region of the array, and the dose sensing output conductors are formed at a lower region of the array. An intermediate conductor layer is then provided which overlaps the dose sensing output conductors for other sub-arrays of pixels and which pass through the area occupied by the sub-array of pixels.

X-ray image detector

An x-ray detector apparatus comprises an array of detector pixels ( ), each pixel ( ) comprising a conversion element ( ) for converting incident radiation into a charge flow, a charge storage element ( ) and a switching device ( ) enabling the charge stored to be provided to an output of the pixel ( ). A plurality of dose sensing pixels further comprise a dose sensing element ( ) during x-ray exposure results in a change in the charge stored on the charge storage element ( ) and also results in a dose sensing signal being generated which can be read out from the pixel ( ). The dose sensing pixels enable a dose signal to be obtained without reading the charges stored on the pixel charge storage elements, so that dose sensing can be carried out during exposure.

Exposure control in an x-ray image detector

An image sensor comprises switching elements 30 on a substrate 1. An insulating separation layer 9 is disposed over the switching elements so that a photodiode arrangement 20a disposed over the insulating separation layer 9, can overlap the switching elements 30 and occupy a maximum area of the image sensor. A barrier layer 10 is interposed between the insulating separation layer 9 and the photodiode arrangement 20a, which prevents degradation of the photodiode characteristics over time.

Semiconductor image sensor with an insulating barrier layer

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Anthony Roy Franklin