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Correlated double sampling method of wide-dynamic-range digital pixel sensor

A technology of pixel sensor and correlated double sampling, which is applied in image communication, TV, color TV parts, etc., and can solve problems such as inability to realize double sampling

Inactive Publication Date: 2013-10-23
TIANJIN UNIV
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Problems solved by technology

However, in a digital pixel sensor, the photosensitive node and the sampling node of the pixel are the same node, and the correlation double sampling in the original pixel cannot be realized.

Method used

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Embodiment Construction

[0044] In the present invention, the total pixel exposure time is divided into two sections, the first section is called the reset sampling stage, and the second section is called the integral sampling stage. In the reset sampling phase, the reference voltage Vref of the comparator in the pixel is at a higher voltage, and the photodiode drops from the reset voltage to intersect with Vref once in the reset sampling phase to obtain a reset sampling value. In the integral sampling stage, Vref becomes a relatively low voltage, the photodiode voltage continues to drop, and finally intersects with Vref for the second time in the integral sampling stage to obtain an integral sampling value. The difference between the integral sampled value and the reset sampled value is the final signal value.

[0045] In addition, in order to obtain a larger dynamic range, it is required that both the high light intensity and the low light intensity can intersect with Vref within the exposure time, so...

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Abstract

The invention relates to the field of CMOS (Complementary Metal Oxide Semiconductor) image sensors and provides a digital pixel sensor which can realize correlated double sampling and has a wide dynamic range. The technical scheme adopted by the invention is that a correlated double sampling method of a wide-dynamic-range digital pixel sensor divides total pixel exposure time into two stages; at a reset sampling stage, the reference voltage Vref of an in-pixel comparator is enabled to be higher voltage, and the voltage of a photodiode drops from reset voltage and is intersected with the reference voltage Vref for a second time at the reset sampling stage to obtain a reset sampling value; at an integral sampling stage, the reference voltage Vref becomes lower voltage, and the voltage of the photodiode continuously drops and finally is intersected with the reference voltage Vref for a second time at the integral sampling stage to obtain an integral sampling value; and difference between the integral sampling value and the reset sampling value is the final signal value. The correlated double sampling method of the wide-dynamic-range digital pixel sensor is mainly applied to the design of CMOS image sensors.

Description

technical field [0001] The invention relates to the field of CMOS image sensors, in particular to a digital pixel sensor adopting correlated double sampling technology, that is, a large dynamic digital pixel sensor adopting correlated double sampling technology. technical background [0002] A digital pixel sensor (digital pixel sensor, DPS) is one of CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) image sensors. This sensor realizes analog-to-digital conversion inside the pixel, and subsequent data readout and processing are performed in the digital domain. PWM (Pulse Width Modulation, pulse width modulation) is a kind of DPS. refer to figure 1 , the PWM-based pixel structure and working process are as follows: a typical PWM pixel consists of a photodiode PD, a reset transistor MRST, a pixel-level, column-level comparator, and a pixel-level, column-level or array-level memory ( figure 1 Take pixel-level comparator and pixel-level m...

Claims

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Application Information

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IPC IPC(8): H04N5/374H04N5/353H04N5/355
Inventor 姚素英高志远徐江涛高静史再峰
Owner TIANJIN UNIV
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