Image sensing apparatus and electronic device

Abstract

The present application discloses an image sensing apparatus and an electronic device. The image sensing apparatus comprises a photosensitive pixel (100), a signal processing circuit (200), and a digital scanning circuit (300). The digital scanning circuit (300) is electrically connected to the signal processing circuit (200). The signal processing circuit (200) is electrically connected to the photosensitive pixel (100), and comprises an analog-to-digital conversion module (210), a switch module (220), and a control module (230). The switch module (220) is electrically connected to the photosensitive pixel (100), and is electrically connected to the analog-to-digital conversion module (210). The control module (230) is electrically connected to the switch module (220). The control module (230) controls, by means of the switch module (220), the signal processing circuit (200) to switch between a first working state and a second working state. When the control module (230) controls the switch module (220) to be turned on so that the signal processing circuit (200) is in the first working state, the analog-to-digital conversion module (210) converts a photosensitive pixel signal to a digital output signal. When the control module (230) controls the switch module (220) to be turned off so that the signal processing circuit (200) is in the second working state, the switch module (220) breaks the electrical connection between the photosensitive pixel (100) and the analog-to-digital conversion module (210).

Description

Image sensing devices and electronic equipment

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on September 15, 2023, with application number 202311198229.6 and invention name “Image Sensing Device and Electronic Device”. The entire contents of the application are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of electronic devices, and in particular to an image sensing device and an electronic device. Background Art

[0004] In a CMOS (Complementary Metal Oxide Semiconductor) image sensor, each row of pixels in the pixel array has a reset period, an exposure period, and a readout period within each frame. The row drivers control the reset and readout signals for each row of pixels, with a time difference between rows. Each row of pixels simultaneously outputs signals to a column-parallel analog-to-digital converter (ADC) for analog-to-digital conversion.

[0005] In CMOS image sensors, dynamic range is generally adjusted by changing the exposure time and pixel signal gain of all pixels. In High Dynamic Range (HDR) technology, dual conversion gain (DCG)-HDR technology uses the same exposure time for all pixels. All pixels are read at two different conversion gains and then fused to achieve high dynamic range. When a CMOS image sensor uses DCG-HDR technology, each row of pixels needs to undergo two pixel signal readings during the read period, using both high conversion gain (HCG) and low conversion gain (LCG). Because the column-parallel ADCs in the pixel signal processing module of a CMOS image sensor cannot simultaneously read and process the pixel output signals under HCG and LCG, each row of pixels needs to be read twice during the read period. However, the ADC consumes energy during operation, so the power consumption of the CMOS image sensor is relatively high when using DCG-HDR technology.

[0006] Summary of the Invention

[0007] The present application discloses an image sensing device and an electronic device, which can reduce the power consumption of the image sensing device.

[0008] In a first aspect, an embodiment of the present application discloses an image sensing device, comprising a photosensitive pixel, a signal processing circuit, and a digital scanning circuit, wherein the photosensitive pixel comprises a photosensitive element for generating a pixel photosensitive signal; the digital scanning circuit is electrically connected to the signal processing circuit; the signal processing circuit is electrically connected to the photosensitive pixel, and the signal processing circuit comprises an analog-to-digital conversion module, a switch module, and a control module; the switch module is electrically connected to the photosensitive pixel, and the switch module is electrically connected to the analog-to-digital conversion module; the control module is electrically connected to the switch module, and the control module controls the signal processing circuit to switch between a first working state and a second working state through the switch module: when the control module controls the switch module to be turned on so that the signal processing circuit is in the first working state, the analog-to-digital conversion module is electrically connected to the photosensitive pixel through the switch module to obtain the pixel photosensitive signal, the analog-to-digital conversion module converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit reads the digital output signal; when the control module controls the switch module to be turned off so that the signal processing circuit is in the second working state, the switch module disconnects the electrical connection between the photosensitive pixel and the analog-to-digital conversion module.

[0009] In a second aspect, an embodiment of the present application discloses an electronic device comprising the image sensing device as described in the first aspect.

[0010] The present invention provides an image sensor device, comprising a photosensitive pixel, a signal processing circuit, and a digital scanning circuit. The photosensitive pixel includes a photosensitive element for generating a pixel photosensitive signal. The digital scanning circuit is electrically connected to the signal processing circuit, which is electrically connected to the photosensitive pixel. The signal processing circuit includes an analog-to-digital conversion module, a switch module, and a control module. The switch module is electrically connected to the photosensitive pixel, the switch module is electrically connected to the analog-to-digital conversion module, and the control module is electrically connected to the switch module. The control module controls the signal processing circuit to switch between a first operating state and a second operating state via the switch module. When the control module controls the switch module to be turned on to put the signal processing circuit in the first operating state, the analog-to-digital conversion module converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit reads the digital output signal. When the control module controls the switch module to be turned off to put the signal processing circuit in the second operating state, the switch module disconnects the electrical connection between the photosensitive pixel and the analog-to-digital conversion module. The image sensor device disclosed in the present invention can be controlled by the control module to turn on or off the switch module according to actual needs. When the switch module is turned off, the analog-to-digital conversion module enters an idle time, thereby reducing the power consumption of the image sensor device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic structural diagram of an image sensing device disclosed in an embodiment of the present application;

[0012] FIG2 is a schematic diagram of a pixel rolling shutter reading method of an image sensing device disclosed in an embodiment of the present application when using DCG-HDR technology;

[0013] FIG3 is a schematic structural diagram of an image sensing device disclosed in an embodiment of the present application;

[0014] FIG4 is a schematic structural diagram of an image sensing device disclosed in an embodiment of the present application;

[0015] FIG5 is a schematic structural diagram of a control module disclosed in an embodiment of the present application;

[0016] FIG6 is a schematic structural diagram of a switch module disclosed in an embodiment of the present application;

[0017] FIG7 is a schematic structural diagram of an image sensing device disclosed in an embodiment of the present application;

[0018] FIG8 is a schematic structural diagram of a control module disclosed in an embodiment of the present application;

[0019] FIG9 is a schematic structural diagram of a switch module disclosed in an embodiment of the present application;

[0020] FIG10 is a schematic structural diagram of an image sensing device disclosed in an embodiment of the present application;

[0021] FIG11 is a schematic structural diagram of a control module disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0023] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0024] The present application discloses an image sensing device. FIG1 is a schematic structural diagram of an image sensing device disclosed in an embodiment of the present application.

[0025] As shown in FIG1 , the image sensing device disclosed in the present application includes a photosensitive pixel (Pixel) 100, a signal processing circuit 200, and a digital scanning circuit 300. The photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220, and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the switching module 220 through the switching module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0026] In the present application, when the analog-to-digital conversion module 210 is required to be electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the switch module 220 is controlled to be turned on by the control module 230 so that the signal processing circuit 200 is in the first working state. When the analog-to-digital conversion module 210 is not required to obtain the pixel photosensitive signal, the switch module 220 is controlled to be turned off by the control module 230 so that the signal processing circuit 200 is in the second working state. That is to say, the image sensing device disclosed in the present application can control the switch module 220 to be turned on or off by the control module 230 according to actual needs. When the switch module 220 is turned off, the analog-to-digital conversion module 210 enters the idle time (Blank), which can reduce the power consumption of the image sensing device.

[0027] For example, when the DCG-HDR technology is adopted, the analog-to-digital conversion module 210 can be electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal output by the photosensitive pixel 100 in any of the high gain processing mode (HCG) and the low gain processing mode (LCG). The analog-to-digital conversion module 210 converts the pixel photosensitive signal output in the processing mode into a digital output signal, and the digital scanning circuit 300 reads the digital output signal. In addition, the control module 230 controls the switch module 220 to remain on or the control module 230 controls the switch module 220 to be disconnected. When the control module 230 controls the switch module 220 to remain on, the signal When the signal processing circuit 200 remains in the first working state, the analog-to-digital conversion module 210 continues to obtain the pixel light-sensing signal output in the other processing mode of the high-gain processing mode and the low-gain processing mode. The analog-to-digital conversion module 210 converts the pixel light-sensing signal output in the processing mode into a digital output signal, and the digital scanning circuit 300 reads the digital output signal. When the control module 230 controls the switch module 220 to be disconnected, so that the signal processing circuit 200 switches from the first working state to the second working state, the analog-to-digital conversion module 210 enters the idle time (Blank), reducing unnecessary operation of the analog-to-digital conversion module 210 to achieve the purpose of saving power. Correspondingly, in the present application, when the image sensing device adopts DCG-HDR technology, the pixel rolling shutter reading method is shown in Figure 2.

[0028] It should be noted that after reading the digital output signal, the digital scanning circuit 300 can send the digital output signal to the image signal processor (ISP) for processing. After processing, the digital output signal is transmitted to the outside of the image sensor device by the interface circuit. The photosensitive pixel 100 can be any pixel in the pixel unit array with M columns and N rows.

[0029] The embodiment of the present application provides an image sensing device, which includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300. The photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal. The digital scanning circuit 300 is electrically connected to the signal processing circuit 200, and the signal processing circuit 200 is electrically connected to the photosensitive pixel 100. In addition, the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230. The switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210, and the control module 230 is electrically connected to the switch module 230. The control module 230 controls the signal processing circuit 200 to switch between a first operating state and a second operating state via the switch module 220. When the control module 230 controls the switch module 220 to be turned on to place the signal processing circuit 200 in the first operating state, the analog-to-digital conversion module 210 converts the pixel light-sensing signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal. When the control module 230 controls the switch module 220 to be turned off to place the signal processing circuit 200 in the second operating state, the switch module 220 disconnects the electrical connection between the light-sensing pixel 100 and the analog-to-digital conversion module 210. The image sensing device disclosed in the present application can be controlled by the control module 230 to be turned on or off according to actual needs. When the switch module 220 is turned off, the analog-to-digital conversion module 210 enters an idle time, thereby reducing the power consumption of the image sensing device.

[0030] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0031] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0032] The image sensing device disclosed in the present application has a first working mode: when the image sensing device is in the first working mode, within one working cycle of the photosensitive pixel 100, the control module 230 controls the signal processing circuit 200 through the switch module 220 to switch from the first working state to the second working state.

[0033] In the present application, the first operating mode of the image sensing device can be to only obtain the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high gain processing mode (HCG) and the low gain processing mode (LCG). One working cycle of the photosensitive pixel 100 can refer to one frame time. Exemplarily, when the image sensing device is in the first operating mode, within one working cycle of the photosensitive pixel 100, the analog-to-digital conversion module 210 can first be electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high gain processing mode (HCG) and the low gain processing mode (LCG). The analog-to-digital conversion module 210 converts the pixel photosensitive signal output in the processing mode into a digital output signal, and the digital scanning circuit 300 reads the digital output signal. In addition, the control module 230 controls the switch module 220 to be disconnected, and controls the signal processing circuit 200 to switch from the first working state to the second working state, and the analog-to-digital conversion module 210 enters the idle time.

[0034] The image sensing device disclosed in the present application may also have a second working mode: when the image sensing device is in the second working mode, within one working cycle of the photosensitive pixel 100, the control module 230 controls the signal processing circuit 200 through the switch module 220 to maintain it in the first working state.

[0035] In the present application, the second operating mode of the image sensing device can be to first obtain the pixel photosensitive signal output by the photosensitive pixel 100 in any one processing mode of the high gain processing mode (HCG) and the low gain processing mode (LCG), and then obtain the pixel photosensitive signal output by the photosensitive pixel 100 in the other processing mode of the high gain processing mode (HCG) and the low gain processing mode (LCG), that is, the pixel photosensitive signal of the photosensitive pixel 100 is obtained and processed twice in the high gain processing mode and the low gain processing mode. Exemplarily, when the image sensing device is in the second operating mode, within one operating cycle of the photosensitive pixel 100, the analog-to-digital conversion module 210 can first be electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high-gain processing mode (HCG) and the low-gain processing mode (LCG). The analog-to-digital conversion module 210 converts the pixel photosensitive signal output in the processing mode into a digital output signal, and the digital scanning circuit 300 reads the digital output signal. In addition, the control module 230 controls the switch module 220 to remain turned on and controls the signal processing circuit 200 to remain in the first operating state. The analog-to-digital conversion module 210 continues to obtain the pixel photosensitive signal output in the other processing mode of the high-gain processing mode and the low-gain processing mode. The analog-to-digital conversion module 210 converts the pixel photosensitive signal output in the processing mode into a digital output signal, and the digital scanning circuit 300 reads the digital output signal.

[0036] In one implementation, the operating mode of the image sensing device can be determined based on the pixel photosensitive signal and the preset signal. For example, when the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high gain processing mode (HCG) and the low gain processing mode (LCG) is greater than or equal to the preset signal, the image sensing device is in the second operating mode; when the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high gain processing mode (HCG) and the low gain processing mode (LCG) is less than the preset signal, the image sensing device is in the first operating mode; or, when the digital output signal converted from the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high gain processing mode (HCG) and the low gain processing mode (LCG) is greater than or equal to the preset signal, the image sensing device is in the second operating mode; when the digital output signal converted from the pixel photosensitive signal output by the photosensitive pixel 100 in any one of the high gain processing mode (HCG) and the low gain processing mode (LCG) is less than the preset signal, the image sensing device is in the first operating mode.

[0037] In another implementation, when the photosensitive pixel 100 outputs the pixel photosensitive signal in a high-gain processing mode, the control module 230 controls the signal processing circuit 200 to operate in the first working state through the switch module 220, and the digital scanning circuit 300 reads the digital output signal; when the photosensitive pixel 100 outputs the pixel photosensitive signal in a low-gain processing mode, the control module 230 controls the signal processing circuit 200 to operate in the second working state through the switch module 220.

[0038] In an embodiment of the present application, a working cycle of the photosensitive pixel 100 may include a reset time period, an exposure time period, and a reading time period, and the reading time period includes a first reading time period and a second reading time period; the photosensitive pixel 100 outputs the pixel photosensitive signal in a high-gain processing mode during the first reading time period, and the photosensitive pixel 100 outputs the pixel photosensitive signal in a low-gain processing mode during the second reading time period.

[0039] In one implementation, when the image sensing device is in the first operating mode, the photosensitive pixel 100 outputs the pixel photosensitive signal in the high-gain processing mode during the first reading time period, and the control module 230 controls the signal processing circuit 200 to switch from the first operating state to the second operating state through the switch module 220 during the first reading time period; the photosensitive pixel 100 outputs the pixel photosensitive signal in the low-gain processing mode during the second reading time period, and the control module 230 controls the signal processing circuit 200 to remain in the second operating state through the switch module 220 during the second reading time period; when the image sensing device is in the second operating mode, the photosensitive pixel 100 outputs the pixel photosensitive signal in the high-gain processing mode during the first reading time period, and the photosensitive pixel 100 outputs the pixel photosensitive signal in the low-gain processing mode during the second reading time period; the control module 230 controls the signal processing circuit 200 to remain in the first operating state through the switch module 220 during the reading time period.

[0040] That is, when the image sensing device is in the first operating mode, the photosensitive pixel 100 outputs a pixel photosensitive signal in a high-gain processing mode during the first reading time period, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, the digital scanning circuit 300 reads the digital output signal, and the control module 230 controls the switch module 220 to switch from on to off during the first reading time period, and the switch module 220 remains off during the second reading time period, that is, the analog-to-digital conversion module 210 is in idle time during the second reading time period. When the image sensing device is in the second operating mode, the switch module 220 remains turned on during the entire reading time period, the photosensitive pixel 100 outputs a pixel photosensitive signal in a high-gain processing mode during the first reading time period, the analog-to-digital conversion module 210 obtains the pixel photosensitive signal and converts the pixel photosensitive signal into a digital output signal, the digital scanning circuit 300 reads the digital output signal, the photosensitive pixel 100 outputs a pixel photosensitive signal in a low-gain processing mode during the second reading time period, the analog-to-digital conversion module 210 obtains the pixel photosensitive signal and converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal.

[0041] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0042] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0043] In an embodiment of the present application, the control module 230 can control the switch module 220 to be turned on or off according to the pixel light-sensing signal or the digital signal generated by the analog-to-digital conversion module 210 according to the pixel light-sensing signal. Alternatively, the control module 230 can also control the switch module 220 to be turned on or off according to the logic signal generated by the pixel light-sensing signal. Exemplarily, the control module 230 can compare the pixel light-sensing signal with a preset signal and control the switch module 220 to be turned on or off according to the comparison result, or the control module 230 can compare the digital signal generated according to the pixel light-sensing signal with the preset signal and control the switch module 220 to be turned on or off according to the comparison result, or the control module 230 can compare the logic signal generated according to the pixel light-sensing signal with the preset signal and control the switch module 220 to be turned on or off according to the comparison result.

[0044] In one implementation, as shown in Figure 3, the analog-to-digital conversion module 210 may include a first comparator 211 and a counter 212, the first comparator 211 having a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to access the first comparison signal, the second input terminal is electrically connected to the switch module 220, the first output terminal is electrically connected to the signal input terminal of the counter 212, and the signal output terminal of the counter 212 is electrically connected to the digital scanning circuit 300; the first comparator 211 generates a photosensitive digital signal according to the pixel photosensitive signal, and the counter 212 generates the digital output signal according to the photosensitive digital signal; the digital signal generated by the analog-to-digital conversion module 210 according to the pixel photosensitive signal is the photosensitive digital signal or the digital output signal.

[0045] Exemplarily, the first comparison signal can be output by a ramp signal generator (Ramp Generator), which is used to output a ramp signal that gradually changes from high to low. When the voltage value of the pixel light-sensitive signal obtained by the second input terminal of the first comparator 211 being electrically connected to the light-sensitive pixel 100 through the switch module 220 is greater than or equal to the voltage value of the ramp signal, the first output terminal of the first comparator 211 outputs a digital signal "1" (or a high-level voltage), and the counter 212 stops counting. The binary number when the counter 212 stops counting is the digital output signal. The digital output signal can be an n-bit digital signal (for example, a 10-bit When the voltage value of the pixel light-sensing signal obtained by the second input terminal of the first comparator 211 electrically connected to the photosensitive pixel 100 through the switch module 220 is less than the voltage value of the ramp signal, the first output terminal of the first comparator 211 outputs a digital signal "0" (or a low-level voltage). The first comparator 211 continues to compare the voltage value of the pixel light-sensing signal with the voltage value of the gradually decreasing ramp signal output by the ramp signal generator until the first output terminal of the first comparator 211 outputs a digital signal "1" (or a high-level voltage), and the counter 212 stops counting. The counter 212 is driven by a clock signal.

[0046] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0047] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0048] In one implementation, as shown in Figure 4, the analog-to-digital conversion module 210 may include a first comparator 211 and a counter 212, the first comparator 211 having a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to access the first comparison signal, the second input terminal is electrically connected to the switch module 220, the first output terminal is electrically connected to the signal input terminal of the counter 212, and the signal output terminal of the counter 212 is electrically connected to the digital scanning circuit 300; the control module 230 includes a third input terminal, a fourth input terminal and a second output terminal; the third input terminal is used to access the preset signal, the second output terminal is connected to the control terminal of the switch module 220; the fourth input terminal is connected to the switch module 220, and the control module 230 is used to control the switch module 220 to be turned on or off according to the preset signal and the pixel photosensitivity signal.

[0049] In an embodiment of the present application, during the first reading time period, the control module 230 compares the preset signal with the pixel photosensitive signal obtained by electrically connecting the switch module 220 and the photosensitive pixel 100. When the pixel photosensitive signal is greater than or equal to the preset signal, the switch module 220 is controlled to remain on, and the reading and processing of the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period are continued. When the pixel photosensitive signal is less than the preset signal, the switch module 220 is controlled to be disconnected, and the analog-to-digital conversion module 210 enters the idle time. During the second reading time period, the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode stops at the switch module 220.

[0050] It should be noted that, depending on the form of the pixel light-sensing signal, the preset signal can be a voltage signal or a current signal.

[0051] In one implementation, when the fourth input terminal is connected to the switch module 220, as shown in Figure 5, the control module 230 may include a second comparator 231, the third input terminal and the fourth input terminal are both input terminals of the second comparator 231, and the preset signal is a second comparison signal; the control module 230 may also include a first trigger 232 and a second trigger 233, the first input terminal D of the first trigger 232 is connected to the output terminal of the second comparator 231, the second input terminal of the first trigger 232 is used to access the first enable signal, and the output terminal Q of the first trigger 232 is connected to the first input terminal D of the second trigger 233; the second input terminal of the second trigger 233 is used to access the second enable signal, and the output terminal of the second trigger 233 is connected to the control terminal of the switch module 220 as the second output terminal.

[0052] In the present application, the second comparator 231 compares the second comparison signal with the pixel photosensitive signal obtained by electrically connecting the switch module 220 and the photosensitive pixel 100. When the pixel photosensitive signal is greater than or equal to the second comparison signal, the output end of the second comparator 231 outputs a binary 1 (or a high voltage level). When the pixel photosensitive signal is less than the second comparison signal, the output end of the second comparator 231 outputs a binary 0 (or a low voltage level). During the first reading time period, the second input terminal of the first trigger 232 is connected to the first enable signal (the first enable signal is binary 1 or a high level), the first input terminal D of the first trigger 232 receives the comparison signal output by the second comparator 231, the first trigger 232 caches the comparison signal, and inputs the comparison signal into the first input terminal D of the second trigger 233 through the output terminal Q of the first trigger 232; during the second reading time period, the second input terminal of the first trigger 232 is disconnected from the first enable signal (at this time, the second input terminal of the first trigger 232 is connected to binary 0 or a low level), and the second input terminal of the second trigger 233 is connected to the second enable signal (the second enable signal is binary 1 or a high level), the output terminal of the second trigger 233 outputs a control signal corresponding to the comparison signal, and the control module 230 controls the switch module 220 to be turned on or off through the control signal.

[0053] In one implementation, the first trigger 232 and the second trigger 233 are both D triggers. As shown in Figure 6, the switch module 220 may include a first transistor 221 and a second transistor 222; the output terminal of the second trigger 233 includes a first output terminal Q of the second trigger 233 and a second output terminal Q' of the second trigger 233; the control end of the first transistor 221 is connected to the first output terminal Q of the second trigger 233, the first end of the first transistor 221 is electrically connected to the photosensitive pixel 100, and the second end of the first transistor 221 is connected to the second input end; the control end of the second transistor 222 is connected to the second output terminal Q' of the second trigger 233, the first end of the second transistor 222 is connected to the first end of the first transistor 221, and the second end of the second transistor 222 is connected to the second end of the first transistor 221.

[0054] In the present application, the signals output by the first output terminal Q of the second trigger 233 and the second output terminal Q' of the second trigger 233 are complementary signals and are directly input to the control terminal of the switch module 220. For example, when the signal output by the first output terminal Q of the second trigger 233 is a binary 1 (or a high level) and the signal output by the second output terminal Q' of the second trigger 233 is a binary 0 (or a low level), the first transistor 221 and the second transistor 222 are both turned on, the switch module 220 is turned on, and the reading and processing of the pixel light-sensing signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period are continued. When the signal output by the first output terminal Q of the second trigger 233 is a binary 0 (or a low level) and the signal output by the second output terminal Q' of the second trigger 233 is a binary 1 (or a high level), the first transistor 221 and the second transistor 222 are both turned off, the switch module 220 is turned off, and the analog-to-digital conversion module 210 enters an idle time.

[0055] In an embodiment of the present application, the control module 230 controls the switch module 220 to be turned on or off according to a preset signal and a pixel photosensitive signal. When it is necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in a low-gain processing mode within the second reading time period, the control module 220 can remain on. When it is not necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in a low-gain processing mode within the second reading time period, the control module 220 can be turned off, and the analog-to-digital conversion module 210 enters an idle time, thereby saving power consumption of the image sensing device.

[0056] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0057] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0058] In one implementation, as shown in Figure 7, the analog-to-digital conversion module 210 may include a first comparator 211 and a counter 212, the first comparator 211 having a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to access the first comparison signal, the second input terminal is electrically connected to the switch module 220, the first output terminal is electrically connected to the signal input terminal of the counter 212, and the signal output terminal of the counter 212 is electrically connected to the digital scanning circuit 300; the control module 230 includes a third input terminal, a fourth input terminal and a second output terminal; the third input terminal is used to access the preset signal, the second output terminal is connected to the control terminal of the switch module 220; the fourth input terminal is connected to the first output terminal, and the control module 230 is used to control the switch module 220 to be turned on or off according to the photosensitive digital signal generated by the first comparator 211.

[0059] In an embodiment of the present application, within the first reading time period, the control module 230 compares the preset signal with the photosensitive digital signal generated by the first comparator 211, and controls the switch module 220 to be turned on or off. For example, if it is determined according to the comparison result that it is necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode within the second reading time period, the control module 230 controls the switch module 220 to remain on, and continues reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode within the second reading time period. If it is determined according to the comparison result that it is not necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode within the second reading time period, the control module 230 controls the switch module 220 to be turned off, and the analog-to-digital conversion module 210 enters the idle time. Within the second reading time period, the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode stops at the switch module 220.

[0060] In one implementation, when the fourth input terminal is connected to the first output terminal, as shown in Figure 8, the control module 230 may include a third trigger 234, and the preset signal is a clock signal; the first input terminal of the third trigger 234 is the third input terminal, the second input terminal of the third trigger 234 is the fourth input terminal, and the output terminal of the third trigger 234 is connected to the control terminal of the switch module 220 as the second output terminal.

[0061] In the present application, during the first reading time period, when the analog-to-digital conversion module 210 converts the pixel photosensitive signal, the sampling time period of the third trigger 234 is controlled by controlling the duration of the clock signal EN_CLK. If the 1-bit photosensitive digital signal output by the first output terminal of the first comparator 211 jumps from 0 to 1 (or from low level to high level) during the sampling time period of the third trigger 234, the control signal output by the output terminal of the third trigger 234 is 0 or a low level, the control switch module 220 is disconnected, and the analog-to-digital conversion module 210 enters the idle time. If the 1-bit photosensitive digital signal output by the first output terminal of the first comparator 211 does not jump from 0 to 1 (or from low level to high level) during the sampling time period of the third trigger 234, the control signal output by the output terminal of the third trigger 234 is 1 or a high level, the control switch module 220 remains on, and continues to read and process the pixel photosensitive signal output by the photosensitive pixel 100 in the low gain processing mode during the second reading time period.

[0062] In one implementation, as shown in Figure 9, the switching module 220 may include an inverter 223, a first transistor 221 and a second transistor 222; the input end of the inverter 223 is connected to the control end of the first transistor 221, and the output end of the inverter 223 is connected to the control end of the second transistor 222; the control end of the first transistor 221 is electrically connected to the second output end, the first end of the first transistor 221 is electrically connected to the photosensitive pixel 100, and the second end of the first transistor 221 is electrically connected to the analog-to-digital conversion module 210; the first end of the second transistor 222 is connected to the first end of the first transistor 221, and the second end of the second transistor 222 is connected to the second end of the first transistor 221.

[0063] In the present application, if the control signal output at the second output terminal of the control module 230 is binary 1 (or a high-level voltage), the first transistor 221 and the second transistor 222 are turned on, and the switch module 220 is turned on, and the reading and processing of the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period are continued. If the control signal output at the second output terminal of the control module 230 is binary 0 (or a low-level voltage), the first transistor 221 and the second transistor 222 are turned off, the switch module 220 is turned off, and the analog-to-digital conversion module 210 enters the idle time.

[0064] In an embodiment of the present application, the control module 230 controls the switch module 220 to be turned on or off according to the preset signal and the photosensitive digital signal generated by the first comparator 211. When it is necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode within the second reading time period, the control switch module 220 can remain on. When it is not necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode within the second reading time period, the control switch module 220 can be turned off, and the analog-to-digital conversion module 210 enters the idle time, thereby saving power consumption of the image sensing device.

[0065] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0066] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0067] In one implementation, as shown in Figure 10, the analog-to-digital conversion module 210 may include a first comparator 211 and a counter 212, the first comparator 211 having a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to access the first comparison signal, the second input terminal is electrically connected to the switch module 220, the first output terminal is electrically connected to the signal input terminal of the counter 212, and the signal output terminal of the counter 212 is electrically connected to the digital scanning circuit 300; the control module 230 includes a third input terminal, a fourth input terminal and a second output terminal; the third input terminal is used to access the preset signal, the second output terminal is connected to the control terminal of the switch module 220; the fourth input terminal is connected to the signal output terminal, and the control module 230 is used to control the switch module 220 to be turned on or off according to the digital output signal.

[0068] In the present application, during the first reading time period, the control module 230 compares the preset signal with the digital output signal output from the signal output end of the counter 212, and controls the switch module 220 to be turned on or off. For example, if it is determined according to the comparison result that it is necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period, the control module 230 controls the switch module 220 to remain on, and continues reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period. If it is determined according to the comparison result that it is not necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period, the control module 230 controls the switch module 220 to be turned off, and the analog-to-digital conversion module 210 enters the idle time. During the second reading time period, the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode stops at the switch module 220.

[0069] In one implementation, when the fourth input terminal is connected to the signal output terminal, as shown in Figure 11, the control module 230 may include a second comparator 231, and the preset signal is a second comparison signal; one input terminal of the second comparator 231 is the third input terminal, and the other input terminal of the second comparator 231 is the fourth input terminal, and the output terminal of the second comparator 231 is connected to the control terminal of the switch module 220 as the second output terminal.

[0070] In the present application, during the first reading time period, when the digital output signal output from the signal output terminal of the counter 212 is greater than or equal to the second comparison signal, the control signal output from the second output terminal of the control module 230 is binary 1 (or a high-level voltage), and the control switch module 220 remains turned on. When the digital output signal output from the signal output terminal of the counter 212 is less than the second comparison signal, the control signal output from the second output terminal of the control module 230 is binary 1 (or a high-level voltage), and the control switch module 220 is turned off.

[0071] In one implementation, as shown in Figure 9, the switching module 220 may include an inverter 223, a first transistor 221 and a second transistor 222; the input end of the inverter 223 is connected to the control end of the first transistor 221, and the output end of the inverter 223 is connected to the control end of the second transistor 222; the control end of the first transistor 221 is electrically connected to the second output end, the first end of the first transistor 221 is electrically connected to the photosensitive pixel 100, and the second end of the first transistor 221 is electrically connected to the analog-to-digital conversion module 210; the first end of the second transistor 222 is connected to the first end of the first transistor 221, and the second end of the second transistor 222 is connected to the second end of the first transistor 221.

[0072] In the present application, if the control signal output at the second output terminal of the control module 230 is binary 1 (or a high-level voltage), the first transistor 221 and the second transistor 222 are turned on, and the switch module 220 is turned on, and the reading and processing of the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period are continued. If the control signal output at the second output terminal of the control module 230 is binary 0 (or a low-level voltage), the first transistor 221 and the second transistor 222 are turned off, the switch module 220 is turned off, and the analog-to-digital conversion module 210 enters the idle time.

[0073] In an embodiment of the present application, the control module 230 controls the switch module 220 to be turned on or off according to a preset signal and a digital output signal output from a signal output terminal of the counter 212. When it is necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in a low-gain processing mode within the second reading time period, the control module 220 can remain on. When it is not necessary to continue reading and processing the pixel photosensitive signal output by the photosensitive pixel 100 in a low-gain processing mode within the second reading time period, the control module 220 can be turned off, and the analog-to-digital conversion module 210 enters an idle time, thereby saving power consumption of the image sensing device.

[0074] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0075] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0076] In one implementation, as shown in Figure 9, the switching module 220 may include an inverter 223, a first transistor 221 and a second transistor 222; the input end of the inverter 223 is connected to the control end of the first transistor 221, and the output end of the inverter 223 is connected to the control end of the second transistor 222; the control end of the first transistor 221 is electrically connected to the control module 230, the first end of the first transistor 221 is electrically connected to the photosensitive pixel 100, and the second end of the first transistor 221 is electrically connected to the analog-to-digital conversion module 210; the first end of the second transistor 222 is connected to the first end of the first transistor 221, and the second end of the second transistor 222 is connected to the second end of the first transistor 221.

[0077] In the present application, when the control signal output by the control module 230 is binary 1 (or a high-level voltage), the first transistor 221 and the second transistor 222 are turned on, and the switch module 220 is turned on, and the reading and processing of the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period are continued. When the control signal output by the control module 230 is binary 0 (or a low-level voltage), the first transistor 221 and the second transistor 222 are turned off, the switch module 220 is turned off, and the analog-to-digital conversion module 210 enters idle time, saving power consumption of the image sensing device.

[0078] In one implementation, as shown in Figure 11, the control module 230 may include a second comparator 231, one input end of the second comparator 231 is used to access a preset signal, the other input end of the second comparator 231 is connected to the signal output end of the analog-to-digital conversion module 210, and the output end of the second comparator 231 is connected to the control end of the first transistor 221.

[0079] In the present application, during the first reading time period, when the digital output signal output from the signal output end of the analog-to-digital conversion module 210 is greater than or equal to the preset signal, the control signal output from the output end of the control module 230 is binary 1 (or a high-level voltage), and the control switch module 220 remains turned on. When the digital output signal output from the signal output end of the analog-to-digital conversion module 210 is less than the preset signal, the control signal output from the output end of the control module 230 is binary 1 (or a high-level voltage), and the control switch module 220 is turned off.

[0080] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0081] In one implementation, the image sensing device disclosed in the present application includes a photosensitive pixel 100, a signal processing circuit 200 and a digital scanning circuit 300, wherein the photosensitive pixel 100 includes a photosensitive element 110 for generating a pixel photosensitive signal; the digital scanning circuit 300 is electrically connected to the signal processing circuit 200; the signal processing circuit 200 is electrically connected to the photosensitive pixel 100, and the signal processing circuit 200 includes an analog-to-digital conversion module 210, a switch module 220 and a control module 230; the switch module 220 is electrically connected to the photosensitive pixel 100, and the switch module 220 is electrically connected to the analog-to-digital conversion module 210; the control module 230 is electrically connected to the switch module 220, and the control module 230 controls the photosensitive pixel 100 through the switch module 220. The signal processing circuit 200 switches between a first working state and a second working state: when the control module 230 controls the switch module 220 to be turned on so that the signal processing circuit 200 is in the first working state, the analog-to-digital conversion module 210 is electrically connected to the photosensitive pixel 100 through the switch module 220 to obtain the pixel photosensitive signal, the analog-to-digital conversion module 210 converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit 300 reads the digital output signal; when the control module 230 controls the switch module 220 to be turned off so that the signal processing circuit 200 is in the second working state, the switch module 220 disconnects the electrical connection between the photosensitive pixel 100 and the analog-to-digital conversion module 210.

[0082] In one implementation, as shown in Figure 9, the switching module 220 may include an inverter 223, a first transistor 221 and a second transistor 222; the input end of the inverter 223 is connected to the control end of the first transistor 221, and the output end of the inverter 223 is connected to the control end of the second transistor 222; the control end of the first transistor 221 is electrically connected to the control module 230, the first end of the first transistor 221 is electrically connected to the photosensitive pixel 100, and the second end of the first transistor 221 is electrically connected to the analog-to-digital conversion module 210; the first end of the second transistor 222 is connected to the first end of the first transistor 221, and the second end of the second transistor 222 is connected to the second end of the first transistor 221.

[0083] In the present application, when the control signal output by the control module 230 is binary 1 (or a high-level voltage), the first transistor 221 and the second transistor 222 are turned on, and the switch module 220 is turned on, and the reading and processing of the pixel photosensitive signal output by the photosensitive pixel 100 in the low-gain processing mode during the second reading time period are continued. When the control signal output by the control module 230 is binary 0 (or a low-level voltage), the first transistor 221 and the second transistor 222 are turned off, the switch module 220 is turned off, and the analog-to-digital conversion module 210 enters idle time, saving power consumption of the image sensing device.

[0084] In one implementation, as shown in Figure 8, the control module 230 may include a third trigger 234, the first input terminal of the third trigger 234 is used to access the clock signal, the second input terminal of the third trigger 234 is connected to the analog-to-digital conversion module 210 to receive the digital signal generated by the analog-to-digital conversion module 210 according to the pixel photosensitivity signal; the output terminal of the third trigger 234 is connected to the control end of the first transistor 221.

[0085] In the present application, during the first reading time period, when the analog-to-digital conversion module 210 converts the pixel light-sensitive signal, the sampling time period of the third trigger 234 is controlled by controlling the duration of the clock signal EN_CLK. If the digital signal generated by the analog-to-digital conversion module 210 based on the pixel light-sensitive signal jumps from 0 to 1 (or from low level to high level) during the sampling time period of the third trigger 234, the control signal output by the output terminal of the third trigger 234 is 0 or a low level, the control switch module 220 is disconnected, and the analog-to-digital conversion module 210 enters the idle time. If the digital signal generated by the analog-to-digital conversion module 210 based on the pixel light-sensitive signal does not jump from 0 to 1 (or from low level to high level) during the sampling time period of the third trigger 234, the control signal output by the output terminal of the third trigger 234 is 1 or a high level, the control switch module 220 remains on, and continues to read and process the pixel light-sensitive signal output by the photosensitive pixel 100 in the low gain processing mode during the second reading time period.

[0086] In one implementation, as shown in Figure 7, the analog-to-digital conversion module 210 may include a first comparator 211 and a counter 212, the first comparator 211 having a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to access the first comparison signal, the second input terminal is electrically connected to the switch module 220, the first output terminal is electrically connected to the signal input terminal of the counter 212, and the signal output terminal of the counter 212 is electrically connected to the digital scanning circuit 300; the second input terminal of the third trigger 234 is connected to the first output terminal.

[0087] Exemplarily, the first comparison signal can be output by a ramp signal generator (Ramp Generator), which is used to output a ramp signal that gradually changes from high to low. When the voltage value of the pixel light-sensitive signal obtained by the second input terminal of the first comparator 211 being electrically connected to the light-sensitive pixel 100 through the switch module 220 is greater than or equal to the voltage value of the ramp signal, the first output terminal of the first comparator 211 outputs a digital signal "1" (or a high-level voltage), and the counter 212 stops counting. The binary number when the counter 212 stops counting is the digital output signal. The digital output signal can be an n-bit digital signal (for example, a 10-bit Binary signal), when the voltage value of the pixel light-sensitive signal obtained by the second input terminal of the first comparator 211 being electrically connected to the photosensitive pixel 100 through the switch module 220 is less than the voltage value of the ramp signal, the first output terminal of the first comparator 211 outputs a digital signal "0" (or a low-level voltage), and the first comparator 211 continues to compare the voltage value of the pixel light-sensitive signal with the voltage value of the gradually decreasing ramp signal output by the ramp signal generator until the first output terminal of the first comparator 211 outputs a digital signal "1" (or a high-level voltage), and the counter 212 stops counting.

[0088] It should be noted that the connections between the modules, circuits or components mentioned above are all electrical connections.

[0089] The present application also provides an electronic device, which includes the image sensing device described above. Since the image sensing device described above is used, the power consumption of the electronic device can be reduced.

[0090] The above embodiments of this application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0091] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. An image sensing device, comprising a photosensitive pixel, a signal processing circuit and a digital scanning circuit, wherein the photosensitive pixel comprises a photosensitive element for generating a pixel photosensitive signal; the digital scanning circuit is electrically connected to the signal processing circuit; The signal processing circuit is electrically connected to the photosensitive pixel, and the signal processing circuit includes an analog-to-digital conversion module, a switch module and a control module; the switch module is electrically connected to the photosensitive pixel, and the switch module is electrically connected to the analog-to-digital conversion module; the control module is electrically connected to the switch module, and the control module controls the signal processing circuit to switch between a first working state and a second working state through the switch module: When the control module controls the switch module to be turned on so that the signal processing circuit is in the first working state, the analog-to-digital conversion module is electrically connected to the photosensitive pixel through the switch module to obtain the pixel photosensitive signal, the analog-to-digital conversion module converts the pixel photosensitive signal into a digital output signal, and the digital scanning circuit reads the digital output signal; When the control module controls the switch module to be disconnected so that the signal processing circuit is in the second working state, the switch module disconnects the electrical connection between the photosensitive pixel and the analog-to-digital conversion module.

2. The image sensing device according to claim 1, wherein: With the first working mode: When the image sensing device is in the first working mode, within one working cycle of the photosensitive pixel, the control module controls the signal processing circuit to switch from the first working state to the second working state through the switch module.

3. The image sensing device according to claim 2, wherein: Also has a second working mode: When the image sensing device is in the second working mode, within one working cycle of the photosensitive pixel, the control module controls the signal processing circuit to remain in the first working state through the switch module.

4. The image sensing device according to claim 1, wherein: In the case where the photosensitive pixel outputs the pixel photosensitive signal in the high-gain processing mode, the control module controls the signal processing circuit to operate in the first working state through the switch module, and the digital scanning circuit reads the digital output signal; In a case where the photosensitive pixel outputs the pixel photosensitive signal in a low-gain processing mode, the control module controls the signal processing circuit to operate in the second working state through the switch module.

5. The image sensing device according to any one of claims 2 to 4, wherein: A working cycle of the photosensitive pixel includes a reset time period, an exposure time period and a reading time period, and the reading time period includes a first reading time period and a second reading time period; The photosensitive pixel outputs the pixel photosensitive signal in a high-gain processing mode during the first reading time period, and the photosensitive pixel outputs the pixel photosensitive signal in a low-gain processing mode during the second reading time period.

6. The image sensing device according to claim 5, wherein: When the image sensing device is in the first working mode, the photosensitive pixel outputs the pixel photosensitive signal in the high-gain processing mode during the first reading time period, and the control module controls the signal processing circuit to switch from the first working state to the second working state through the switch module during the first reading time period; the photosensitive pixel outputs the pixel photosensitive signal in the low-gain processing mode during the second reading time period, and the control module controls the signal processing circuit to remain in the second working state through the switch module during the second reading time period; When the image sensing device is in the second operating mode, the photosensitive pixel outputs the pixel photosensitive signal in a high-gain processing mode during the first reading time period, and the photosensitive pixel outputs the pixel photosensitive signal in a low-gain processing mode during the second reading time period; the control module controls the signal processing circuit to remain in the first operating state through the switch module during the reading time period.

7. The image sensing device according to claim 1, wherein: The control module controls the switch module to be turned on or off according to the pixel light sensing signal or the digital signal generated by the analog-to-digital conversion module according to the pixel light sensing signal.

8. The image sensing device according to claim 7, wherein: The analog-to-digital conversion module includes a first comparator and a counter, wherein the first comparator has a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to receive a first comparison signal, the second input terminal is electrically connected to the switch module, the first output terminal is electrically connected to the signal input terminal of the counter, and the signal output terminal of the counter is electrically connected to the digital scanning circuit; The first comparator generates a photosensitivity digital signal according to the pixel photosensitivity signal, and the counter generates the digital output signal according to the photosensitivity digital signal; the digital signal generated by the analog-to-digital conversion module according to the pixel photosensitivity signal is the photosensitivity digital signal or the digital output signal.

9. The image sensing device according to claim 1, wherein: The analog-to-digital conversion module includes a first comparator and a counter, wherein the first comparator has a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to receive a first comparison signal, the second input terminal is electrically connected to the switch module, the first output terminal is electrically connected to the signal input terminal of the counter, and the signal output terminal of the counter is electrically connected to the digital scanning circuit; The control module includes a third input terminal, a fourth input terminal and a second output terminal; the third input terminal is used to receive a preset signal, and the second output terminal is connected to the control terminal of the switch module; The fourth input terminal is connected to the switch module, and the control module is used to control the switch module to be turned on or off according to the preset signal and the pixel light sensing signal; or The fourth input terminal is connected to the first output terminal, and the control module is used to control the switch module to be turned on or off according to the light-sensitive digital signal generated by the first comparator; or The fourth input terminal is connected to the signal output terminal, and the control module is used to control the switch module to be turned on or off according to the digital output signal.

10. The image sensing device according to claim 9, wherein: In the case where the fourth input terminal is connected to the switch module, the control module includes a second comparator, the third input terminal and the fourth input terminal are both input terminals of the second comparator, and the preset signal is a second comparison signal; The control module also includes a first trigger and a second trigger, wherein the first input terminal of the first trigger is connected to the output end of the second comparator, the second input terminal of the first trigger is used to access a first enable signal, and the output terminal of the first trigger is connected to the first input terminal of the second trigger; the second input terminal of the second trigger is used to access a second enable signal, and the output terminal of the second trigger is connected to the control end of the switch module as the second output end.

11. The image sensing device according to claim 10, wherein: The first trigger and the second trigger are both D triggers, and the switch module includes a first transistor and a second transistor; The output terminal of the second flip-flop includes a first output terminal of the second flip-flop and a second output terminal of the second flip-flop; The control end of the first transistor is connected to the first output terminal of the second trigger, the first end of the first transistor is electrically connected to the photosensitive pixel, and the second end of the first transistor is connected to the second input end; the control end of the second transistor is connected to the second output terminal of the second trigger, the first end of the second transistor is connected to the first end of the first transistor, and the second end of the second transistor is connected to the second end of the first transistor.

12. The image sensing device according to claim 11, wherein: In a first reading time period, the second input terminal of the first trigger is connected to the first enable signal, the first input terminal of the first trigger receives the comparison signal output by the second comparator, and the comparison signal is input to the first input terminal of the second trigger; In a second reading time period, the second input terminal of the first trigger disconnects the first enable signal, and the second input terminal of the second trigger connects the second enable signal, the output terminal of the second trigger outputs a control signal corresponding to the comparison signal, and the control module controls the switch module to be turned on or off through the control signal.

13. The image sensing device according to claim 9, wherein: In the case where the fourth input terminal is connected to the first output terminal, the control module includes a third trigger, and the preset signal is a clock signal; The first input terminal of the third trigger is the third input end, the second input terminal of the third trigger is the fourth input end, and the output terminal of the third trigger is connected to the control end of the switch module as the second output end.

14. The image sensing device according to claim 9, wherein: In the case where the fourth input terminal is connected to the signal output terminal, the control module includes a second comparator, and the preset signal is a second comparison signal; One input end of the second comparator is the third input end, the other input end of the second comparator is the fourth input end, and the output end of the second comparator is connected to the control end of the switch module as the second output end.

15. The image sensing device according to claim 13 or 14, wherein: The switch module includes an inverter, a first transistor and a second transistor; The input end of the inverter is connected to the control end of the first transistor, and the output end of the inverter is connected to the control end of the second transistor; The control end of the first transistor is electrically connected to the second output end, the first end of the first transistor is electrically connected to the photosensitive pixel, and the second end of the first transistor is electrically connected to the analog-to-digital conversion module; the first end of the second transistor is connected to the first end of the first transistor, and the second end of the second transistor is connected to the second end of the first transistor.

16. The image sensing device according to any one of claims 1 to 9, wherein: The switch module includes an inverter, a first transistor and a second transistor; The input end of the inverter is connected to the control end of the first transistor, and the output end of the inverter is connected to the control end of the second transistor; The control end of the first transistor is electrically connected to the control module, the first end of the first transistor is electrically connected to the photosensitive pixel, and the second end of the first transistor is electrically connected to the analog-to-digital conversion module; the first end of the second transistor is connected to the first end of the first transistor, and the second end of the second transistor is connected to the second end of the first transistor.

17. The image sensing device according to claim 16, wherein: The control module includes a second comparator, one input end of the second comparator is used to access a preset signal, the other input end of the second comparator is connected to the signal output end of the analog-to-digital conversion module, and the output end of the second comparator is connected to the control end of the first transistor.

18. The image sensing device according to claim 16, wherein: The control module includes a third trigger, a first input terminal of the third trigger is used to access a clock signal, a second input terminal of the third trigger is connected to the analog-to-digital conversion module to receive a digital signal generated by the analog-to-digital conversion module according to the pixel photosensitivity signal; an output terminal of the third trigger is connected to the control end of the first transistor.

19. The image sensing device according to claim 18, wherein: The analog-to-digital conversion module includes a first comparator and a counter, the first comparator having a first input terminal, a second input terminal and a first output terminal; the first input terminal is used to receive a first comparison signal, the second input terminal is electrically connected to the switch module, the first output terminal is electrically connected to the signal input terminal of the counter, and the signal output terminal of the counter is electrically connected to the digital scanning circuit; the second input terminal of the third trigger is connected to the first output terminal.

20. An electronic device comprising the image sensing device according to any one of claims 1 to 19.

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