Fill light control circuit and image acquisition equipment

Abstract

The present application discloses a fill light control circuit and an image acquisition device. The fill light control circuit includes: a main control circuit, which adjusts the first voltage signal output from the first output terminal or the second voltage signal output from the second output terminal based on the fill light demand; a first driving circuit, which drives the filter component to switch to the first filter mode based on the adjusted first voltage signal or drives the filter component to switch to the second filter mode based on the adjusted second voltage signal; a logic control circuit, which adjusts the output third voltage signal based on the adjusted first voltage signal or the adjusted second voltage signal; a second driving circuit, which drives the fill light component to switch to the first light mode corresponding to the first filter mode or to the second light mode corresponding to the second filter mode based on the adjusted third voltage signal. In this way, the present application realizes the association between the filter mode switching and the light mode switching, so that the switching of the two corresponds to each other, thereby improving the fill light effect and image quality.

Description

Technical Field

[0001] The present application relates to the field of image acquisition technology, and in particular to a fill light control circuit and an image acquisition device. Background Art

[0002] Currently, fill lights are often used in the field of image acquisition technology to enhance images, so that image acquisition devices, such as cameras, can obtain better image effects in scenes with different illumination.

[0003] Fill lights are usually used with filters, but the filters and fill lights are controlled by software using different pins of the main control circuit. There is no correlation between them in hardware, and the control method of the fill light is not related to the switching of the filters, resulting in poor fill light effect. Summary of the invention

[0004] The main technical problem solved by the present application is how to realize the association between the switching of the filter mode and the switching of the light mode so that the switching of the two corresponds to each other, thereby improving the fill light effect and image quality.

[0005] In order to solve the above technical problems, the present application provides a fill light control circuit. The fill light control circuit includes: a main control circuit, which is provided with a first output end and a second output end, and the main control circuit adjusts a first voltage signal output by the first output end or a second voltage signal output by the second output end based on fill light requirements; a first drive circuit, which is electrically connected to the first output end and the second output end respectively, and the first drive circuit is also used to drive and connect with a filter component, and the first drive circuit drives the filter component to switch to a first filter mode based on the adjusted first voltage signal or drives the filter component to switch to a second filter mode based on the adjusted second voltage signal; a logic control circuit, which is electrically connected to the first output end and the second output end respectively, and the logic control circuit adjusts the output third voltage signal based on the adjusted first voltage signal or the adjusted second voltage signal; a second drive circuit, which is electrically connected to the logic control circuit, and the second drive circuit is also used to electrically connect with a fill light component, and the second drive circuit drives the fill light component to switch to a first light mode corresponding to the first light filter mode or to a second light mode corresponding to the second light filter mode based on the adjusted third voltage signal.

[0006] In some embodiments, the first light filtering mode includes a night light mode, the second light filtering mode includes a daylight mode, the first light mode includes an infrared light mode, and the second light mode includes a white light mode; in response to the ambient light intensity being less than a first threshold, the main control circuit adjusts the first voltage signal output by the first output terminal, and keeps the second voltage signal output by the second output terminal unchanged; in response to the ambient light intensity being greater than a second threshold, the main control circuit adjusts the second voltage signal output by the second output terminal, and keeps the first voltage signal output by the first output terminal unchanged.

[0007] In some embodiments, in response to the ambient light intensity being less than the first threshold, the first output terminal outputs a first square wave signal, and the second output terminal continues to output a low level signal; in response to the ambient light intensity being greater than the second threshold, the second output terminal outputs a second square wave signal, and the first output terminal continues to output a low level signal.

[0008] In some embodiments, the third voltage signal includes a first high level signal and a second high level signal, and the logic control circuit includes: a trigger circuit, having a first input terminal and a second input terminal, the first input terminal is electrically connected to the first output terminal, and the second input terminal is electrically connected to the second output terminal, the trigger circuit is also provided with a third output terminal and a fourth output terminal electrically connected to the second drive circuit, the trigger circuit outputs the first high level signal from the third output terminal based on the first square wave signal, so that the second drive circuit drives the fill light component to switch to the first lighting mode; the trigger circuit outputs the second high level signal from the fourth output terminal based on the second square wave signal, so that the second drive circuit drives the fill light component to switch to the second lighting mode.

[0009] In some embodiments, the trigger circuit includes a JK flip-flop.

[0010] In some embodiments, the logic control circuit also includes: a delay circuit, which is electrically connected to the first output end, the second output end and the clock end of the trigger circuit respectively, and the delay circuit delays the first square wave signal or the second square wave signal and supplies it to the trigger circuit as a clock signal.

[0011] In some embodiments, the delay circuit includes: an XOR gate.

[0012] In some embodiments, the logic control circuit also includes: a switching circuit, wherein the control end of the switching circuit is electrically connected to the delay circuit, the first communication end of the switching circuit is electrically connected to the control end of the main control circuit, and the second communication end of the switching circuit is electrically connected to the second drive circuit; wherein the switching circuit is turned off at the rising edge of the clock signal to turn off the output of the modulation signal of the main control circuit to the second drive circuit, and the switching circuit is turned on at the falling edge of the clock signal to restore the output of the modulation signal of the main control circuit to the second drive circuit.

[0013] In some embodiments, the switch circuit includes: a tri-state gate.

[0014] In some embodiments, the fill light assembly includes: a white fill light and an infrared fill light, and the second driving circuit includes: a driving chip, which is electrically connected to the control end of the main control circuit, the white fill light and the infrared fill light; a first switch tube, the control end of the first switch tube is electrically connected to the logic control circuit, the first communication end of the first switch tube is electrically connected to the white fill light, and the second communication end of the first switch tube is electrically connected to the driving chip; a second switch tube, the control end of the second switch tube is electrically connected to the logic control circuit, the first communication end of the second switch tube is electrically connected to the infrared fill light, and the second communication end of the second switch tube is electrically connected to the driving chip.

[0015] In some embodiments, in response to power-on, the main control circuit controls the filter assembly to be in the white light mode, and controls the second drive circuit to not work; in response to the end of power-on, the main control circuit determines whether it is necessary to switch the filter assembly based on the fill light demand; in response to the need to switch the filter assembly, the main control circuit controls the filter assembly to switch to the night light mode, and controls the fill light assembly to switch to the infrared light mode; in response to the need not to switch the filter assembly, the main control circuit controls the fill light assembly to switch to the infrared light mode.

[0016] In order to solve the above technical problems, the present application provides an image acquisition device, including the above fill light control circuit.

[0017] The beneficial effects of the present application are: the main control circuit of the present application selectively adjusts the first voltage signal output by the first output terminal or the second voltage signal output by the second output terminal based on the fill light demand, and the first driving circuit drives the filter component to switch to the first filtering mode based on the adjusted first voltage signal, or drives the filter component to switch to the second filtering mode based on the adjusted second voltage signal; at the same time, the logic control circuit controls the second driving circuit to drive the fill light and other components to switch to the first lighting mode corresponding to the first filtering mode based on the adjusted first voltage signal, or controls the second driving circuit to drive the fill light and other components to switch to the second lighting mode corresponding to the second filtering mode based on the adjusted second voltage signal. In this way, the signal that controls the first driving circuit to drive the filter component to switch the filter mode and the signal that controls the second driving circuit to drive the fill light component to switch the lighting mode are the same signal output from the same port, which can realize the association and synchronization of the filter mode switching and the lighting mode switching, and the hardware cost is low; and the change of the first output signal is associated with the first filter mode and the first lighting mode, and the change of the second output signal is associated with the second lighting mode and the second lighting mode, which can improve the accuracy of the association between the filter mode and the corresponding lighting mode; therefore, the present application can improve the association between the filter mode switching and the lighting mode switching, so that the switching of the two corresponds, thereby improving the fill light effect and image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a fill light control circuit of the present application;

[0020] Figure 2 yes Figure 1 A schematic diagram of the circuit structure of the logic control circuit in the embodiment;

[0021] Figure 3 yes Figure 2 A timing diagram of the logic control circuit of the embodiment;

[0022] Figure 4 yes Figure 2 Another timing diagram of the logic control circuit of the embodiment;

[0023] Figure 5 yes Figure 1 A schematic diagram of the circuit structure of the second driving circuit and the fill light assembly in the embodiment;

[0024] Figure 6 It is a flow chart of an embodiment of the fill light control method of the present application. DETAILED DESCRIPTION

[0025] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0026] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0027] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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 without creative work are within the scope of protection of this application.

[0031] Currently, fill lights are often used in the field of image acquisition technology to enhance images, so that image acquisition devices, such as cameras, can obtain better image effects in scenes with different illumination.

[0032] Fill light methods include visible fill light or infrared fill light. In most cases, visible fill light (white fill light) is used for color images, and infrared fill light is used for black and white images. At the same time, when switching to infrared fill light, the camera lens needs to switch the filter to prevent the image from being reddish.

[0033] The inventors of the present application discovered that the use of different fill light means requires the use of two fill light drivers, but in actual applications, the white fill light and the infrared fill light are used for color images and black images respectively, and the two will not be turned on at the same time. In addition, for general equipment, the switching of filters is usually used in conjunction with the fill light, but the filter switching and fill light control are controlled by software using different general-purpose input / output (GPIO) pins, and there is no mutual correlation in hardware. If the software program is abnormal, it will lead to filter switching and fill light switching errors, which not only occupies software resources, but also increases hardware costs, and the fill light effect is not good.

[0034] In the related art, the fill light control method has no associated filter switching, and is based on images to control the two drivers of the white fill light and the infrared fill light respectively. Therefore, two modulation signal resource pins and two drivers must be used separately, which not only occupies software resources, but also increases hardware costs.

[0035] To this end, the present application first proposes a fill light control circuit for controlling the filter component to switch the filter mode and the fill light component to switch the light mode, and realizing the association between the two, so as to increase the fill light effect and improve the image quality. Figure 1As shown, the fill light control circuit of this embodiment includes: a main control circuit 10, a first drive circuit 20, a logic control circuit 30 and a second drive circuit 40; wherein the main control circuit 10 is provided with a first output terminal A2 and a second output terminal B2, and the main control circuit 10 adjusts the first voltage signal output by the first output terminal A2 or the second voltage signal output by the second output terminal B2 based on the fill light demand; the first drive circuit 20 is electrically connected to the first output terminal A2 and the second output terminal B2 respectively, and the first drive circuit 20 is also used for driving connection with the filter assembly (not shown), and the first drive circuit 20 drives the filter assembly to switch to the first filtering mode based on the adjusted first voltage signal Or based on the adjusted second voltage signal, the filter assembly is driven to switch to the second filtering mode; the logic control circuit 30 is electrically connected to the first output terminal A2 and the second output terminal B2, respectively, and the logic control circuit 30 adjusts the output third voltage signal based on the adjusted first voltage signal or based on the adjusted second voltage signal; the second drive circuit 40 is electrically connected to the logic control circuit 30, and the second drive circuit 40 is also used to be electrically connected to the fill light assembly (not shown), and the second drive circuit 40 drives the fill light assembly to switch to the first light mode corresponding to the first filtering mode or to the second light mode corresponding to the second filtering mode based on the adjusted third voltage signal.

[0036] Wherein, the main control circuit 10 adjusts the first voltage signal of the first output terminal A2 based on the fill light requirement, which may be that the main control circuit 10 changes the level of the first voltage signal based on the fill light requirement, for example, the first voltage signal is adjusted from a low level to a high level, or the voltage value of the first voltage signal is changed, or the output signal of the first output terminal A2 is changed from no to yes, etc., so that the output voltage of the first output terminal A2 is adjusted and changed; the main control circuit 10 adjusts the second voltage signal of the second output terminal B2 based on the fill light requirement, which may be that the main control circuit 10 changes the level of the second voltage signal based on the fill light requirement, for example, the second voltage signal is adjusted from a low level to a high level, or the voltage value of the second voltage signal is changed, or the output signal of the second output terminal B2 is changed from no to yes, etc., so that the output voltage of the second output terminal B2 is adjusted and changed. In this embodiment, by detecting the changes of the first voltage signal and the second voltage signal, and adjusting and changing the output signal of the logic control circuit 30 and the third voltage signal according to these changes, the second drive circuit 40 is controlled to switch the state of the fill light assembly; and the first drive circuit 20 is controlled to switch the state of the filter assembly according to these changes.

[0037] In some embodiments, the main control circuit 10 may determine the fill light requirement based on image information or photosensitivity information, or may determine the fill light requirement based on clock information and preset conditions, or may determine the fill light requirement based on user selection, etc. It should be noted that the compensation requirement may be directly image information or photosensitivity information and preset information, and the main control circuit 10 adjusts the output voltage signal based on this information.

[0038] For example, in one application scenario, the main control circuit 10 can determine the fill light requirement based on the ambient light intensity. For example, when the light intensity is high during the day, the main control circuit 10 controls the first drive circuit 20 to switch the filter assembly to the daylight mode, and controls the second drive circuit 40 to switch the fill light assembly to the white light mode by adjusting its output voltage signal.

[0039] In some embodiments, the filter assembly may include at least two different filters, such as a daylight filter and a night light filter; or the filter assembly may include only one filter, which switches to a filtering mode or a non-filtering mode under different fill light requirements; or the filter assembly may include more than two different filters, which are combined to achieve at least two filtering modes.

[0040] In some embodiments, the filter assembly may specifically include an ICR filter, i.e., an infrared dual filter switcher, whose core function is to automatically switch filters according to changes in ambient light to optimize image quality. During the day, the ICR will allow the camera to use an infrared-insensitive filter to filter out stray light, allowing only visible light and infrared light to pass through, ensuring the true color of daytime shots. At night, it will switch to an infrared-sensitive filter to enhance visible light, reduce noise, and improve imaging effects in low-light environments.

[0041] In some embodiments, the fill light assembly may include at least two different fill lights, such as a white fill light and an infrared fill light; or the fill light assembly may include only one fill light, which switches to a light mode or a non-light mode under different fill light requirements; or the fill light assembly may include more than two different fill lights, and at least two light modes are achieved through combination.

[0042] In other embodiments, the main control circuit may be provided with more than two output terminals, and the matching switching of more than two fill lights and filters may be achieved by respectively adjusting the voltage signals output by the more than two output terminals.

[0043] In some embodiments, the main control circuit 10 may include an integrated chip such as a system on a chip (SoC), a micro controller unit (MCU), or a non-integrated control circuit with control and data processing functions.

[0044] In some embodiments, the first output terminal A2 and the second output terminal B2 are GPIO ports or the like.

[0045] The main control circuit 10 of this embodiment selectively adjusts the first voltage signal output by the first output terminal A2 or the second voltage signal output by the second output terminal B2 based on the fill light demand, and the first driving circuit 20 drives the filter component to switch to the first filtering mode based on the adjusted first voltage signal, or drives the filter component to switch to the second filtering mode based on the adjusted second voltage signal; at the same time, the logic control circuit 30 controls the second driving circuit to drive 40 the fill light and other components to switch to the first light mode corresponding to the first filtering mode based on the adjusted first voltage signal, or controls the second driving circuit 40 to drive the fill light and other components to switch to the second light mode corresponding to the second filtering mode based on the adjusted second voltage signal. In this way, the signal for controlling the first driving circuit 20 to drive the filter component to switch the filtering mode and the signal for controlling the second driving circuit 40 to drive the fill light component to switch the lighting mode are the same signal output from the same port, which can realize the association and synchronization of the filtering mode switching and the lighting mode switching, and has low hardware cost and small software resource occupation; and the change of the first output signal is associated with the first filtering mode and the first lighting mode, and the change of the second output signal is associated with the second lighting mode and the second lighting mode, which can improve the accuracy of the association between the filtering mode and the corresponding lighting mode; therefore, this embodiment can improve the association between the filtering mode switching and the lighting mode switching, so that the switching of the two corresponds, thereby improving the fill light effect and image quality.

[0046] In some embodiments, the first light filtering mode includes a night light mode, the second light filtering mode includes a daylight mode, the first light mode includes an infrared light mode, and the second light mode includes a white light mode; in response to the ambient light intensity being less than a first threshold, the main control circuit 10 adjusts the first voltage signal output by the first output terminal A2, and keeps the second voltage signal output by the second output terminal B2 unchanged; in response to the ambient light intensity being greater than a second threshold, the main control circuit 10 adjusts the second voltage signal output by the second output terminal B2, and keeps the first voltage signal output by the first output terminal A2 unchanged.

[0047] The first threshold may be less than or equal to the second threshold.

[0048] For example, the main control circuit 10 controls the first voltage signal from a low level signal to a high level signal, while the second voltage signal remains a low level signal; or the main control circuit 10 controls the first voltage signal from a high level signal to a low level signal, while the second voltage signal remains a high level signal; or the main control circuit 10 can also adjust the above voltage signal by changing the voltage value of the above voltage signal, and determine whether the above voltage signal changes through circuits such as comparators or sampling circuits.

[0049] In this embodiment, on the one hand, the night light mode is associated with the infrared light mode, so that in an image acquisition scenario with relatively low light intensity, the image fill light effect can be enhanced and the image quality can be improved through the light filtering of the night light mode and the fill light of the infrared light mode; on the other hand, the daylight mode is associated with the white light mode, so that in an image acquisition scenario with relatively high light intensity, the image fill light effect can be enhanced and the image quality can be improved through the light filtering of the daylight mode and the fill light of the white light mode; on the other hand, the main control circuit 10 can accurately control the change of the first voltage signal output by the first output terminal A2, and accurately control the change of the second voltage signal output by the second output terminal B2, thereby improving the accuracy of switching the filter mode and the light mode.

[0050] In some embodiments, in response to the image being a black and white image, the main control circuit 10 adjusts the first voltage signal output by the first output terminal A2 and keeps the second voltage signal output by the second output terminal B2 unchanged, so as to switch the light filtering mode to the night light mode and the light mode to the infrared light mode; in response to the image being a color image, the main control circuit 10 adjusts the second voltage signal output by the second output terminal B2 and keeps the first voltage signal output by the first output terminal A2 unchanged, so as to switch the light filtering mode to the daylight mode and the light mode to the white light mode.

[0051] In some embodiments, in response to the ambient light intensity being less than a first threshold, the first output terminal A2 outputs a first square wave signal A, and the second output terminal B2 continues to output a low level signal; in response to the ambient light intensity being greater than a second threshold, the second output terminal B2 outputs a second square wave signal B, and the first output terminal A2 continues to output a low level signal.

[0052] This embodiment uses a square wave signal to achieve changes in the first voltage signal and the second voltage signal. The signal is simple and easy to generate, simple to control, low cost, and high precision. The main control circuit 10 does not need to continuously output a high-level signal, which can save circuit power consumption.

[0053] The implementation methods of other fill light scenarios are similar to the implementation methods of the ambient light intensity scenario and are not described in detail in this application.

[0054] In some embodiments, the third voltage signal includes a first high level signal A1 and a second high level signal B1, and the logic control circuit 30 includes: a trigger circuit 31, the trigger circuit 31 is provided with a first input terminal J and a second input terminal K, the first input terminal J is electrically connected to the first output terminal A2, and the second input terminal K is electrically connected to the second output terminal B2, the trigger circuit 31 is also provided with a third output terminal Q and a fourth output terminal Q- electrically connected to the second drive circuit 40, the trigger circuit 31 outputs a first high level signal A1 from the third output terminal Q based on the first square wave signal A, so that the second drive circuit 40 drives the fill light component to switch to the first lighting mode; the trigger circuit 31 outputs a second high level signal B1 from the fourth output terminal Q- based on the second square wave signal B, so that the second drive circuit 40 drives the fill light component to switch to the second lighting mode.

[0055] In this embodiment, the trigger circuit 31 is used to convert the first square wave signal A into the first high level signal A1, and the second voltage signal is kept as a low level signal at the same time; the trigger circuit 31 is used to convert the second square wave signal B into the second high level signal B1, and the first voltage signal is kept as a low level signal at the same time. In this way, not only the control stability of the second driving circuit 40 by the logic control circuit 30 can be improved, that is, the disappearance of the high level of the square wave signal will not cause the control failure of the second driving circuit 40; but also the other voltage signal without the square wave signal can be kept as a low level signal, which can improve the reliability of the light mode switching.

[0056] In some embodiments, the trigger circuit 31 includes a JK trigger, the first input terminal J of the JK trigger is electrically connected to the first output terminal A2, the second input terminal K is electrically connected to the second output terminal B2, and the third output terminal Q and the fourth output terminal Q_ are both electrically connected to the second drive circuit 40.

[0057] Among them, the JK flip-flop has the functions of set 0, set 1, hold and flip. Among all kinds of integrated flip-flops, the JK flip-flop has the most complete functions. In practical applications, it is not only highly versatile, but also can flexibly convert other types of flip-flops. The truth table of the JK flip-flop is as follows:

[0058] Table 1 Truth table of JK flip-flop

[0059]

[0060] When the first voltage signal input by the first input terminal J is a low level signal and the second voltage signal input by the second input terminal K is a low level signal, the third output terminal Q outputs a low level signal and the fourth output terminal Q- outputs a high level signal, so that the second drive circuit 40 drives the fill light component to be in white light mode, and this mode can be set as the default mode; when the second input terminal K inputs the second square wave signal B, that is, a high level signal, and the first voltage signal input by the second input terminal J maintains a low level signal, the third output terminal Q outputs a low level signal and the fourth output terminal Q- outputs a high level signal, so that the second drive circuit 40 drives the fill light component to be in white light mode.

[0061] This embodiment can not only switch between the infrared light mode and the white light mode of the fill light assembly through the JK trigger, but also set the white light mode to the default mode, that is, the lighting mode when the first voltage signal and the second voltage signal do not change.

[0062] In other embodiments, other trigger circuits, such as RS trigger, D trigger, T trigger, etc., may be used to cooperate with adjusting the first voltage signal and the second voltage signal to achieve the effect of the above embodiment.

[0063] In some embodiments, the logic control circuit 30 also includes: a delay circuit 32, which is electrically connected to the first output terminal A2, the second output terminal B2 and the clock terminal CLK of the trigger circuit 31 respectively. The delay circuit 32 delays the first square wave signal A or the second square wave signal B and supplies it to the trigger circuit 31 as a clock signal.

[0064] In this embodiment, the delay circuit 32 is used to obtain a time-delay signal of the square wave signal, and the delay signal is used as the clock signal of the trigger circuit 31, so that the first high-level signal A1 output by the trigger circuit 31 is delayed compared to the first square wave signal A, and the second high-level signal B1 output by the trigger circuit 31 is delayed compared to the second square wave signal B (the delay here refers to the rising edge moment of the high-level signal).

[0065] In this way, on the one hand, this embodiment does not require an additional clock source, and can generate a clock signal through the first square wave signal A or the second square wave signal B, with a simple structure, low cost, and high control accuracy for the second drive circuit 40; on the other hand, it can improve the ability of the trigger circuit 31 to successfully trigger the generation of the first high-level signal A1 or the second high-level signal B1 when a rising edge of a clock signal arrives, without the need for an additional rising edge; compared to conventional periodic clock signals, the present application only generates a clock signal based on a square wave output by the front-end circuit, and triggers the generation of a high-level signal only when switching is required, with higher control accuracy.

[0066] In other embodiments, the clock signal may be directly obtained according to the square wave signal or directly input, thereby saving the delay circuit.

[0067] In some embodiments, the delay circuit 32 includes an XOR gate. The two input terminals of the XOR gate are electrically connected to the first output terminal A2 and the second output terminal B2 respectively, and the output terminal of the XOR gate is electrically connected to the clock terminal CLK of the trigger circuit 31. When the two input terminals of the XOR gate are different, its output terminal outputs a high level signal, and when the two output terminals are the same, its output terminal outputs a low level signal.

[0068] In this embodiment, not only can a delayed clock signal be generated through the XOR gate, but also a corresponding clock signal can be generated based on a change in one of the first voltage signal and the second voltage signal.

[0069] In other embodiments, other logic gate circuits may be used to implement the functions implemented by the above-mentioned XOR gate, or other combinations of logic gate circuits and trigger circuits may be used to implement the functions of the above-mentioned embodiments.

[0070] In some embodiments, the logic control circuit 30 also includes: a switching circuit 33, wherein the control end of the switching circuit 33 is electrically connected to the delay circuit 32, the first communication end of the switching circuit 33 is electrically connected to the control end C of the main control circuit 10, and the second communication end of the switching circuit 33 is electrically connected to the second drive circuit 40; wherein the switching circuit 33 is turned off at the rising edge of the clock signal to turn off the output of the modulation signal of the main control circuit 10 to the second drive circuit 40, and the switching circuit 33 is turned on at the falling edge of the clock signal to restore the output of the modulation signal of the main control circuit 10 to the second drive circuit 40.

[0071] Specifically, the control end of the switch circuit 33 is electrically connected to the output end of the delay circuit 32 (such as the output end of the XOR gate).

[0072] The control terminal C of the main control circuit 10 of this embodiment can also be electrically connected to the second drive circuit 40. In at least one of the above-mentioned lighting modes, the main control circuit 10 controls the second drive circuit 40 to adjust the light intensity of each lighting mode to improve the fill light effect and enhance the image quality.

[0073] The modulation signal may include a pulse width modulation (PWM) signal, and the light intensity of the fill light is adjusted by adjusting the duty cycle of the PWM signal.

[0074] In this embodiment, the switch circuit 33 is used to open and close the electrical connection between the main control circuit 10 and the second drive circuit 40, and the switch circuit 33 can shut down the output of the modulation signal of the main control circuit 10 to the second drive circuit 40 at the rising edge of the clock signal, and restore the output of the modulation signal of the main control circuit 10 to the second drive circuit 40 at the falling edge of the clock signal. In this way, during the light mode switching process, the modulation signal can be output to the second drive circuit 40 without outputting the modulation signal, and the modulation signal can be output to the second drive circuit 40 after the switching is completed, which can save power consumption and reduce the probability of the switch tubes used to control different light modes in the second drive circuit 40 being turned on at the same time, thereby reducing the transient current of the switch tube and improving the reliability of the circuit.

[0075] In other embodiments, the second driving circuit may also be directly electrically connected to the main control circuit, so that the second driving circuit is controlled by the main control circuit to adjust the fill light intensity of each lighting mode.

[0076] In some embodiments, the switch circuit 33 includes a three-state gate, the input end of the three-state gate is electrically connected to the main control circuit 10, the output end of the three-state gate is electrically connected to the second drive circuit 40, the control end of the three-state gate is connected to the clock signal, and the three-state gate is turned on at a low level and cut off at a high level.

[0077] In an application scenario, such as Figure 2 and Figure 3 As shown, the JK trigger converts the first square wave signal A into a high-level signal delayed compared to the first square wave signal A and output from the third output terminal Q when the rising edge of the clock signal (the signal output from the clock terminal CLK) arrives, and the fourth output terminal Q—maintains a low-level signal; at the same time, the high level of the clock signal controls the three-state gate to be disconnected, so that the PWM1 output by the three-state gate stops being output to the second drive circuit 40.

[0078] In an application scenario, such as Figure 2 and Figure 4 As shown, the JK trigger converts the second square wave signal B into a high-level signal delayed compared to the second square wave signal B and output from the fourth output terminal Q- when the rising edge of the clock signal (the signal output by the clock terminal CLK) arrives, and the third output terminal Q maintains a low-level signal; at the same time, the high level of the clock signal controls the three-state gate to be disconnected, so that the PWM1 output by the three-state gate stops being output to the second drive circuit 40.

[0079] in, Figure 3 and Figure 4 In the figure, the signals of each port of the JK flip-flop are identified by their corresponding port numbers.

[0080] In some embodiments, Figure 5As shown, the fill light assembly includes a white fill light and an infrared fill light; the second drive circuit 40 includes: a drive chip, a first switch tube Q1 and a second switch tube Q2; the drive chip 41 is electrically connected to the control end C of the main control circuit 10, the white fill light and the infrared fill light; the control end of the first switch tube Q1 is electrically connected to the logic control circuit 30, the first communication end of the first switch tube Q1 is electrically connected to the white fill light, and the second communication end of the first switch tube Q1 is electrically connected to the drive chip 41; the control end of the second switch tube Q2 is electrically connected to the logic control circuit 30, the first communication end of the second switch tube Q2 is electrically connected to the infrared fill light, and the second communication end of the second switch tube Q2 is electrically connected to the drive chip 41 PWM1.

[0081] Specifically, the control end of the first switch tube Q1 is electrically connected to the third output end Q in the logic control circuit 30 , and the control end of the second switch tube Q2 is electrically connected to the fourth output end Q— in the logic control circuit 30 .

[0082] The infrared fill light may include an infrared LED lamp, and the white fill light may include a white LED lamp. The power supply terminal VCC of the driver chip 41 is used to access the power supply signal; the output terminal LX of the driver chip 41 is connected to the infrared fill light and the white fill light through a coil; the feedback terminal FB of the driver chip 41 is connected to the second communication terminal of the first switch tube Q1 and the second communication terminal of the second switch tube Q2.

[0083] The second driving circuit 40 controls the conduction and shutdown of the fill light link through the level output by the logic control circuit 30 to realize the switching of the fill light. Specifically, it is composed of a driving chip and two MOS tubes (a first switch tube Q1 and a second switch tube Q2). The conduction and shutdown of the two MOS are controlled by the state of the first high-level signal A1 and the second high-level signal B1, so as to realize the switching of the fill light state with one driving, which can improve the problem of two MOS being turned on at the same time. The shutdown can switch the corresponding fill light with the switching state of the filter component, which can improve the problem that the fill light switching logic is abnormal due to program errors and does not correspond to the filter. The input of the logic control circuit 30 is high impedance, which will not affect the switching of the filter component. The DIM pin of the driving chip mainly controls the size of the conduction current according to the duty cycle of the PWM1 signal. The DIM pin is controlled by the PWM1 signal. The PWM1 signal disconnects the three-state gate when the fill light is switched, so that the driving chip is in a state of no current output. When the filter switching is completed, the three-state gate remains in the conducting state and the fill light is on.

[0084] In some embodiments, the first driving circuit 20 includes an H-bridge circuit, which can switch the filter according to the states of the first output terminal A2 and the second output terminal B2.

[0085] In some embodiments, in response to power-on, the main control circuit 10 controls the filter assembly to be in white light mode, and controls the second drive circuit 40 to not work; in response to the end of power-on, the main control circuit 10 determines whether it is necessary to switch the filter assembly based on the fill light requirement; in response to the need to switch the filter assembly, the main control circuit 10 controls the filter assembly to switch to night light mode, and controls the fill light assembly to switch to infrared light mode; in response to the need not to switch the filter assembly, the main control circuit 10 controls the fill light assembly to switch to infrared light mode.

[0086] When the device is powered on and started, it enters the white light mode by default. The output signals of the first output terminal A2 and the second output terminal B2 remain at a low level to keep the first drive circuit 20 from outputting. The second drive circuit can remain in a non-open state according to the duty cycle or voltage of the PWM1 signal. When the image or photosensitive detection detects that the ambient brightness is lower than a certain value, the first output terminal A2 outputs a square wave, and the second output terminal B2 is at a low level. The first drive circuit 20 will output a positive square wave to make the ICR coil forwardly conductive and switch the luminous film. When the ambient brightness changes from low to high and is higher than the preset value, the first output terminal A2 is at a low level, and the second output terminal B2 outputs a square wave. The first drive circuit 20 will output a reverse square wave to make the ICR coil reversely conductive and switch the daylight film.

[0087] In some embodiments, Figure 6 As shown, first the device starts to power on, the universal camera will default to white light mode, that is, color mode. At this time, the filter will remain in the daylight mode or switch to the daylight mode. The second drive circuit 40 remains in a non-open state according to the duty cycle or voltage of PWM1. After the device is powered on, it is determined whether to switch the filter according to the image and photosensitivity. If the filter needs to be switched, the voltage signal output by the first output terminal A2 and the second output terminal B2 is controlled to switch the state of the filter. At the same time, the logic control circuit 30 switches the corresponding light mode according to the voltage signal output by the first output terminal A2 and the second output terminal B2. The duty cycle or voltage of PWM1 is adjusted according to the image, etc. The brightness of the fill light is adjusted by voltage; if the filter does not need to be switched, since the power-on default is the color mode, the power-on states of the voltage signals output by the first output terminal A2 and the second output terminal B2 are both low level. After the logic control circuit 30 is powered on, the output of the third output terminal Q is defaulted to a low level by the pull-down resistor. According to the above truth state table, the state remains default, the fill light state is defaulted to the white light state, and then the duty cycle or voltage of PWM1 is adjusted according to the image, etc. to adjust the brightness of the fill light; another way is to manually set the state, which is controlled according to the image mode set by itself and the brightness of the fill light, and its control logic is similar to the above image or light-sensitive control.

[0088] The driving chip may be a constant voltage driving chip, a constant current driving chip, a pulse driving chip, etc. The constant voltage driving chip may include a DC / DC boost chip, etc.

[0089] The present application further proposes an image acquisition device, including a fill light control circuit, a camera body, a filter assembly and a fill light assembly. The fill light control circuit uses the control method described in the above embodiment to control the operation of the filter assembly and the fill light assembly. For details, please refer to the above embodiment.

[0090] The main control circuit of the present application selectively adjusts the first voltage signal outputted from the first output terminal or the second voltage signal outputted from the second output terminal based on the fill light demand, and the first driving circuit drives the filter component to switch to the first filtering mode based on the adjusted first voltage signal, or drives the filter component to switch to the second filtering mode based on the adjusted second voltage signal; at the same time, the logic control circuit controls the second driving circuit to drive the fill light and other components to switch to the first lighting mode corresponding to the first filtering mode based on the adjusted first voltage signal, or controls the second driving circuit to drive the fill light and other components to switch to the second lighting mode corresponding to the second filtering mode based on the adjusted second voltage signal. In this way, the signal that controls the first driving circuit to drive the filter component to switch the filter mode and the signal that controls the second driving circuit to drive the fill light component to switch the lighting mode are the same signal output from the same port, which can realize the association and synchronization of the filter mode switching and the lighting mode switching, and the hardware cost is low; and the change of the first output signal is associated with the first filter mode and the first lighting mode, and the change of the second output signal is associated with the second lighting mode and the second lighting mode, which can improve the accuracy of the association between the filter mode and the corresponding lighting mode; therefore, the present application can improve the association between the filter mode switching and the lighting mode switching, so that the switching of the two corresponds, thereby improving the fill light effect and image quality.

[0091] Furthermore, by combining filter switching with fill light switching, the problem of fill light switching logic abnormality caused by program errors that makes it inconsistent with the filter can be improved; by controlling the filter through a logic control circuit and switching the fill light state at the same time, not only can one drive be reduced, but also the modulation signal can be controlled to be turned on and off to keep it in a no-output state when the switch tube is switched, thereby preventing high transient current from switching, and also reducing the resources of one modulation signal transmission pin, greatly reducing equipment cost and resource utilization; it can effectively reduce the area of ​​the circuit board, and at the same time can also reduce the number of connector PINs when the main board and the light board are matched, effectively reducing equipment cost.

[0092] If the technical solution of this application involves personal information, the product using the technical solution of this application has clearly informed the personal information processing rules and obtained the individual's voluntary consent before processing the personal information. If the technical solution of this application involves sensitive personal information, the product using the technical solution of this application has obtained the individual's separate consent before processing the sensitive personal information, and at the same time meets the "explicit consent" requirement. For example, on personal information collection devices such as cameras, clear and prominent signs are set to inform that the personal information collection scope has been entered and personal information will be collected. If the individual voluntarily enters the collection scope, it is deemed that he or she agrees to the collection of his or her personal information; or on the device that processes personal information, the personal information processing rules are notified by obvious signs / information, and the individual's authorization is obtained through pop-up information or by asking the individual to upload his or her personal information; among them, the personal information processing rules may include information such as the personal information processor, the purpose of personal information processing, the processing method, and the type of personal information processed.

[0093] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A fill light control circuit, characterized in that: The fill light control circuit comprises: A main control circuit is provided with a first output end and a second output end, and the main control circuit adjusts a first voltage signal output by the first output end or a second voltage signal output by the second output end based on a fill light requirement; A first driving circuit is electrically connected to the first output terminal and the second output terminal respectively, and the first driving circuit is also used to drive the filter assembly, and the first driving circuit drives the filter assembly to switch to the first filtering mode based on the adjusted first voltage signal or drives the filter assembly to switch to the second filtering mode based on the adjusted second voltage signal; a logic control circuit, electrically connected to the first output terminal and the second output terminal respectively, and the logic control circuit adjusts the output third voltage signal based on the adjusted first voltage signal or the adjusted second voltage signal; a second driving circuit, electrically connected to the logic control circuit, the second driving circuit being further used to be electrically connected to the fill light assembly, the second driving circuit driving the fill light assembly to switch to a first light mode corresponding to the first light filtering mode or to a second light mode corresponding to the second light filtering mode based on the adjusted third voltage signal; Wherein, the first light filtering mode includes a night light mode, the second light filtering mode includes a daylight mode, the first light mode includes an infrared light mode, and the second light mode includes a white light mode; In response to the ambient light intensity being less than a first threshold, the main control circuit adjusts the first voltage signal output by the first output terminal, and keeps the second voltage signal output by the second output terminal unchanged; In response to the ambient light intensity being greater than a second threshold, the main control circuit adjusts the second voltage signal output by the second output terminal and keeps the first voltage signal output by the first output terminal unchanged; Wherein, in response to the ambient light intensity being less than the first threshold, the first output terminal outputs a first square wave signal, and the second output terminal keeps outputting a low level signal; In response to the ambient light intensity being greater than the second threshold, the second output terminal outputs a second square wave signal, and the first output terminal keeps outputting a low level signal; Wherein, the third voltage signal includes a first high level signal and a second high level signal, and the logic control circuit includes: The trigger circuit is provided with a first input terminal and a second input terminal, wherein the first input terminal is electrically connected to the first output terminal, and the second input terminal is electrically connected to the second output terminal. The trigger circuit is also provided with a third output terminal and a fourth output terminal electrically connected to the second drive circuit. The trigger circuit outputs the first high level signal from the third output terminal based on the first square wave signal, so that the second drive circuit drives the fill light component to switch to the first lighting mode; the trigger circuit outputs the second high level signal from the fourth output terminal based on the second square wave signal, so that the second drive circuit drives the fill light component to switch to the second lighting mode.

2. The fill light control circuit according to claim 1, characterized in that: The trigger circuit includes a JK trigger.

3. The fill light control circuit according to claim 1, characterized in that: The logic control circuit also includes: The delay circuit is electrically connected to the first output end, the second output end and the clock end of the trigger circuit respectively. The delay circuit delays the first square wave signal or the second square wave signal and supplies it to the trigger circuit as a clock signal.

4. The fill light control circuit according to claim 3, characterized in that: The delay circuit comprises: an XOR gate.

5. The fill light control circuit according to claim 3, characterized in that: The logic control circuit also includes: a switch circuit, wherein a control end of the switch circuit is electrically connected to the delay circuit, a first communication end of the switch circuit is electrically connected to a control end of the main control circuit, and a second communication end of the switch circuit is electrically connected to the second drive circuit; Among them, the switching circuit is turned off at the rising edge of the clock signal to shut down the output of the modulation signal of the main control circuit to the second drive circuit, and the switching circuit is turned on at the falling edge of the clock signal to restore the output of the modulation signal of the main control circuit to the second drive circuit.

6. The fill light control circuit according to claim 5, characterized in that: The switch circuit includes: a three-state gate.

7. The fill light control circuit according to claim 1, characterized in that: The fill light assembly includes: a white fill light and an infrared fill light, and the second driving circuit includes: A driving chip, electrically connected to the control end of the main control circuit, the white fill light and the infrared fill light; A first switch tube, wherein a control end of the first switch tube is electrically connected to the logic control circuit, a first communication end of the first switch tube is electrically connected to the white fill light, and a second communication end of the first switch tube is electrically connected to the driving chip; A second switch tube, wherein the control end of the second switch tube is electrically connected to the logic control circuit, the first communication end of the second switch tube is electrically connected to the infrared fill light, and the second communication end of the second switch tube is electrically connected to the driving chip.

8. The fill light control circuit according to claim 1, characterized in that: In response to power-on, the main control circuit controls the filter assembly to be in the white light mode, and controls the second driving circuit to be non-operating; In response to the power-on being completed, the main control circuit determines whether it is necessary to switch the filter assembly based on the fill light requirement; In response to the need to switch the filter assembly, the main control circuit controls the filter assembly to switch to the night light mode, and controls the fill light assembly to switch to the infrared light mode; In response to the filter assembly not needing to be switched, the main control circuit controls the fill light assembly to switch to the infrared light mode.

9. An image acquisition device, characterized in that: The invention comprises the fill light control circuit as described in any one of claims 1 to 8.

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