Digital radiographic imaging apparatus
First Claim
Patent Images
1. A light sensing array comprising:
- a plurality of electrically isolated photo sensors, each photosensor comprising a first terminal and a second terminal, each of the terminals of each photosensor being isolated from the terminals of the other photosensors, wherein each photosensor responds to an incident light level by producing a charge difference between the first and second terminal; and
a differential circuit selectively coupled to the first and second terminals of one of the photosensors for producing an output signal related to the charge difference between the first and second terminals.
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Abstract
A light sensing array has a plurality of electrically isolated photosensors, each photosensor having a first terminal and a second terminal, each of the terminals of each photosensor being isolated from the terminals of the other photosensors, wherein each photosensor responds to an incident light level by producing a charge difference between the first and second terminal. There is a differential circuit selectively coupled to the first and second terminals of one of the photo sensors for producing an output signal related to the charge difference between the first and second terminals.
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Citations
25 Claims
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1. A light sensing array comprising:
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a plurality of electrically isolated photo sensors, each photosensor comprising a first terminal and a second terminal, each of the terminals of each photosensor being isolated from the terminals of the other photosensors, wherein each photosensor responds to an incident light level by producing a charge difference between the first and second terminal; and a differential circuit selectively coupled to the first and second terminals of one of the photosensors for producing an output signal related to the charge difference between the first and second terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A light sensing array comprising:
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a plurality of photosensors, each photosensor comprising a first terminal and a second terminal, a signal sensing circuit corresponding to each photo sensor, wherein the signal sensing circuit comprises; (i) a first amplifier connected to the first terminal; (ii) a first switch responsive to a scan signal to connect the first amplifier to a first data line; (iii) a second amplifier connected to the second terminal; and (iv) a second switching element responsive to a scan signal to connect the second amplifier signal to a second data line; and a differential circuit for sensing the difference between signal levels on the first data line and the second data line. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A light sensing array comprising:
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a front plane comprising a plurality of photosensor pairs, each photosensor in the photosensor pair comprising a first terminal and a second terminal, wherein each photosensor corresponds to an image pixel and wherein each photosensor responds to an incident light level by forming a charge between the first and second terminal according to the incident light level; a differential amplifier corresponding to each photosensor pair, wherein the differential amplifier has first and second data lines; and first and second charge sensing circuits corresponding to each differential amplifier, wherein each charge sensing circuit comprises; (i) a first amplifier providing a first output signal varying with the charge level at the first terminal; (ii) a first switch responsive to a scan signal to couple the first output signal to the first data line; (iii) a first reset switch for switching the first terminal to a first reset voltage level; (iv) a second amplifier providing a second output signal varying with the charge level at the second terminal; (v) a second switch responsive to a scan signal to couple the second output signal to the second data line; and (vi) a second reset switch for switching the second terminal to a reset voltage level. - View Dependent Claims (25)
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Specification