| 摘要 |
An image sensor (10) comprises an array having an image sensing portion (12) and a control portion (14). Pixels (18) of the image sensing portion and devices (20) of the control circuitry portion each comprise a diode stack (34) of a back-to-back switching diode (36, 38, 40) and a photodiode (42, 44, 46). The photodiodes of the devices (20) are constantly illuminated in use so that they act as current sources in series with the switching diode. This provides a circuit device which has characteristics enabling its use in control circuitry.
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