Current/voltage mode image sensor with switchless active pixels

H - Electricity – 04 – N

Patent

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H04N 5/341 (2011.01) H04N 5/369 (2011.01)

Patent

CA 2688488

A voltage and current mode active pixel sensor for high resolution imaging is presented. The photo pixel is composed of a photodiode and two transistors: reset and transconductance amplifier transistor. The switch transistor is moved outside the pixel, allowing for lower pixel pitch and increased linearity of the output photocurrent. The reset and amplifier (readout) transistors may also be shared among adjacent pixels by the introduction of transfer switches between the photodiodes and the source of the reset transistor and the gate of the readout transistor. The switch transistor outside the pixels provides biasing voltages or currents to the readout transistors to selectively turn them on when readout of the corresponding photodiode is desired and turns the readout transistor off when the corresponding photodiode is not to be read out.

L'invention concerne un capteur de pixels actifs fonctionnant en mode tension ou courant pour une imagerie haute résolution. Le pixel photo est composé d'une photodiode et de deux transistors : un transistor de réinitialisation et un transistor amplificateur de transconductance. Le transistor de commutation est déplacé à l'extérieur du pixel, ce qui permet d'obtenir un pas de pixel plus faible et une plus grande linéarité du courant photoélectrique de sortie. Les transistors de réinitialisation et d'amplification (lecture) peuvent également être partagés entre les pixels adjacents par l'introduction de commutateurs de transfert entre les photodiodes et la source du transistor de réinitialisation et la grille du transistor de lecture. Le transistor de commutation externe aux pixels fournit des tensions ou des courants de polarisation aux transistors de lecture pour les activer sélectivement lorsque la lecture de la photodiode correspondante est souhaitée, et désactive le transistor de lecture lorsque la photodiode correspondante n'est pas lue.

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