Image sensing circuit and method

Abstract

The invention provides an image sensing circuit. The image sensing circuit comprises a floating node, a switching circuit, at least one capacitor and a counting circuit; the floating node is used for receiving the image charge of a photosensitive pixel; the switching circuit is coupled between the floating node and the capacitor, and dynamically connects and disconnects the floating node and the capacitor; the capacitor has a first end coupled to the switching circuit and a second end coupled to the ground; the counting circuit counts the charging and discharging times of the capacitor according to the dynamic switching of the switching circuit, wherein the switching circuit performs dynamic switching to make the capacitor dynamically charge and discharge to receive the energy of the image charge, and the energy of the image charge is determined by the charging and discharging times counted by the counting circuit and a potential value finally measured by the capacitor.

Description

technical field [0001] The present invention refers to an image sensing mechanism, especially to an image sensing circuit and method. Background technique [0002] Generally speaking, in the current photosensitive element, the image sensing circuit used in it usually adopts the technology of superimposing several images, or by increasing the size of the physical capacitance in the photosensitive element to achieve high image quality. The effect of the dynamic range of brightness, while the former needs to take several images, and the latter needs to increase the circuit cost (larger capacitors occupy a larger circuit area), each has its own disadvantages. Contents of the invention [0003] One of the objectives of the present invention is to provide an image sensing circuit and method, which can achieve the highest dynamic range of image brightness in a single image with a relatively small circuit cost, and solve the problems encountered in the current prior art. [0004]...

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Problems solved by technology

[0002] Generally speaking, in the current photosensitive element, the image sensing circuit used in it usually adopts the technology of superimposing several images, or by increasing the size of the physical capacitance in the photosensitive element to achieve high image quality. The effect of the dynamic range of brightness, while the former needs to take several images, and the latter needs to increase the circuit cost (larger capacitors occupy a larger circuit area), each has its own disadvantages

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