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A pulse width modulation pixel exposure method and pixel structure

A technology of pulse width modulation and pixel structure, which is applied in the field of image sensors, can solve the problems of poor dynamic range performance of pulse width modulation pixels and achieve ultra-low power consumption

Active Publication Date: 2019-06-18
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the prior art described above, the purpose of the present invention is to provide a pulse width modulation pixel exposure method and a pixel structure for solving the problem of poor dynamic range performance of pulse width modulation pixels in the prior art

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  • A pulse width modulation pixel exposure method and pixel structure
  • A pulse width modulation pixel exposure method and pixel structure

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Embodiment 1

[0037] This embodiment provides a pulse width modulation pixel exposure method, the pulse width modulation pixel includes a photodiode, and the method includes the following steps:

[0038] When performing the exposure operation of the pulse width modulation pixel, the photodiode is first reset to the reset voltage. Under illumination, the node voltage of the photodiode decreases linearly with a slope related to the light intensity. At this time, the node voltage of the photodiode is compared with two reference voltages of different levels to obtain two sets of pixel signals. Due to the digital characteristics of the output signal, the two sets of pixel signals can be synthesized and output on the same column line.

[0039] As a preferred solution of the present invention, the node voltage of the photodiode can be compared with two reference voltages of different levels through two comparators, and two sets of pixel signals can be obtained in the same exposure period.

[0040] As a ...

Embodiment 2

[0042] See figure 1 This embodiment provides a pulse width modulation pixel structure that can implement the above exposure method. The structure includes: a photodiode PD, a reset transistor M1, a first comparator B1, a second comparator B2, a control switch K1, a combination circuit, and a counter.

[0043] Wherein, one end of the reset transistor M1 is connected to the power supply VDD, the other end is connected to the reverse input end of the photodiode PD, and the gate is connected to the reset signal Rst; the forward input end of the photodiode PD is grounded; The input terminal of a comparator B1 is respectively connected to the node voltage of the photodiode PD and the first reference voltage RefH, and the output terminal of the first comparator B1 is connected to the combination circuit via the control switch K1; The input terminal of the second comparator B2 is respectively connected to the node voltage of the photodiode PD and the second reference voltage RefL, and th...

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Abstract

The invention provides a pulse width modulation pixel exposure method and a pixel structure. In this exposure method, two comparators are used to compare the node voltage of the photodiode with two reference voltages of different heights after exposure to obtain two sets of pixel signals, and then the two sets of pixel signals are synthesized and output. The pulse width modulation pixel structure includes a reset transistor, a photodiode, a first comparator, a second comparator, a control switch, a combination circuit and a counter. The invention retains the advantage of ultra-low power consumption of PWM pulse width pixels, and at the same time realizes the secondary exposure mode suitable for PWM pulse width modulation pixels according to the characteristics of pixel-level digital-to-analog conversion in PWM pixels.

Description

Technical field [0001] The present invention relates to the technical field of image sensors, and in particular to a pulse width modulation pixel exposure method and pixel structure. Background technique [0002] The Internet of Things technology is widely used in the integration of networks through communication perception technologies such as intelligent perception, recognition technology and pervasive computing. Therefore, it is called the third wave of the world's information industry development after computers and the Internet. In the Internet of Things, a large number of sensors are needed to collect physical information of the natural world such as temperature, humidity, pressure and even images. Among them, the image sensor has a wide range of applications and more significant research significance because of the intuitive signals it collects and the large amount of information that can be mined. However, today's Internet of Things requires sensors in it to be more inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/355
CPCH04N25/58H04N25/589
Inventor 汪辉霍书瑶章琦汪宁田犁
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI