Brightness control device and shooting equipment

Abstract

The utility model discloses a brightness control device. The device comprises a power supply module, a photosensitive component, a waveform generation circuit module used for generating a pulse width modulation (PWM) waveform and a light emitting module comprising one or more light emitting diodes (LEDs), wherein the power supply module is used for providing a working power supply for the waveform generation circuit module; the photosensitive component is used for controlling the waveform generation circuit module to generate a first working signal with a high-low level duty ratio matched with the ambient light brightness based on a detected photosensitive working parameter matched with the ambient light brightness of the environment where the brightness control device is located; the waveform generation circuit module is used for controlling the light-emitting brightness of the light-emitting module based on the first working signal; wherein the waveform generation circuit module does not comprise an operational component with operational capability. The utility model further discloses shooting equipment.

Description

Technical Field

[0001] The present application relates to the field of control technology, and in particular to a brightness control device and a shooting equipment. Background Art

[0002] With the rapid development of the control level of the manufacturing industry, in order to ensure the visual experience of users, some light-emitting display devices have begun to be widely used, and how to adjust the brightness of the light-emitting display devices has become a popular research topic. For example, in consumer electronic products, the brightness adjustment of light-emitting diodes (LEDs) is generally used in the scene of adjusting the screen backlight LED lights. The current commonly used solution is that the processor system-on chip (Systemon Chip, SOC) first calculates the ambient light brightness, and then outputs instructions to the screen backlight driver integrated circuit (Integrated Circuit, IC), so that the backlight driver IC outputs the corresponding voltage and current according to the output instructions to adjust the brightness of the backlight LED lamp.

[0003] However, in the above application process, since the processor and backlight driver IC need to perform calculations and processing, there is a certain lag in the backlight brightness adjustment process, resulting in an inability to respond in time to some scenes where the ambient light changes rapidly. In addition, since electronic products need to occupy processor resources in real time when working normally, when other processes executed by the processor are blocked, the screen brightness adjustment function will fail. Utility Model Content

[0004] In order to solve the above technical problems, the present application hopes to provide a brightness control device and a shooting device, which solves the problem that the current processor and the backlight driver IC are needed to adjust the brightness of the LED lamp, and proposes a hardware device that does not require a processor and a backlight driver IC to adjust the brightness of the LED lamp. The device can adjust the brightness of the LED lamp in real time according to the ambient light brightness, thereby ensuring the real-time and reliability of the brightness adjustment of the LED lamp.

[0005] The technical solution of this application is implemented as follows:

[0006] The present application provides a brightness control device, the device comprising: a power supply module, a photosensitive component, a waveform generation circuit module for generating a pulse width modulation (PWM) waveform, and a light-emitting module comprising one or more light-emitting diodes (LEDs); wherein:

[0007] The power supply module is used to provide working power for the waveform generating circuit module;

[0008] The photosensitive component is used to control the waveform generation circuit module to generate a first working signal with a high and low level duty ratio matching the ambient light brightness based on the detected photosensitive working parameter matching the ambient light brightness of the environment where the brightness control device is located;

[0009] The waveform generating circuit module is used to control the light emitting brightness of the light emitting module based on the first working signal.

[0010] In the above solution, the waveform generation circuit module at least includes an astable multivibrator circuit; wherein:

[0011] The photosensitive component is connected in series with an RC circuit in the astable multivibrator circuit.

[0012] In the above solution, the device further comprises: a signal amplification circuit module; wherein:

[0013] The power supply module is also used to provide working power for the signal amplification circuit module;

[0014] The signal amplifying circuit module is used to amplify the first working signal output by the waveform generating circuit module to obtain a second working signal, so as to control the light emitting brightness of the light emitting module through the second working signal.

[0015] In the above solution, the signal amplification circuit module includes: an oscillation amplification circuit; wherein:

[0016] The signal input end of the oscillation amplifier circuit is connected to the output end of the waveform generation circuit module.

[0017] In the above solution, the device further comprises: a boost circuit module; wherein:

[0018] The input end of the boost circuit module is connected to the output end of the waveform generating circuit module.

[0019] In the above solution, the device further comprises: a boost circuit module; wherein:

[0020] The input end of the boost circuit module is connected to the output end of the signal amplifying circuit module.

[0021] In the above scheme,

[0022] The boost circuit module is used to boost the brightness control signal input to the light emitting module; wherein the brightness control signal is the first working signal of the waveform generating circuit module, or the second working signal output by the signal amplifying circuit module.

[0023] In the above solution, the boost circuit module includes a boost chopper circuit; wherein:

[0024] The output end of the boost chopper circuit is connected to the input end of the light emitting module.

[0025] In the above solution, the photosensitive component at least includes: a photoresistor.

[0026] The present application provides a photographing device, which comprises at least: a camera, a memory, a communication bus and any one of the brightness control devices described above.

[0027] The embodiment of the present application provides a brightness control device and a shooting device, wherein the brightness control device includes a power supply module, a photosensitive component, a waveform generation circuit module for generating a PWM waveform, and a light-emitting module including one or more LEDs, wherein the power supply module is used to provide a working power supply for the waveform generation circuit module, the photosensitive component is used to control the waveform generation circuit module to generate a first working signal of a high and low level duty ratio matching the ambient light brightness based on the detected photosensitive working parameters matching the ambient light brightness of the environment in which the brightness control device is located, and the waveform generation circuit module is used to control the light-emitting brightness of the light-emitting module based on the first working signal. In this way, PWM generates a corresponding first working signal to control the light-emitting brightness of the light-emitting block according to the photosensitive working parameters detected by the photosensitive component, realizing a technical solution for controlling the brightness of the light-emitting LED through hardware, solving the problem that a processor and a backlight driver IC are currently required to adjust the brightness of the LED lamp, and proposing a hardware device for adjusting the brightness of the LED lamp without a processor and a backlight driver IC, which can adjust the brightness of the LED lamp in real time according to the ambient light brightness, and ensures the real-time and reliability of the brightness adjustment of the LED lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of the brightness control device provided in the embodiment of the present application Figure 1 ;

[0029] Figure 2 A schematic diagram of the structure of the brightness control device provided in the embodiment of the present application Figure 2 ;

[0030] Figure 3 A schematic diagram of the structure of the brightness control device provided in the embodiment of the present application Figure 3 ;

[0031] Figure 4 A schematic diagram of the structure of the brightness control device provided in the embodiment of the present application Figure 4 ;

[0032] Figure 5 A schematic diagram of the circuit structure of a brightness control device provided in an embodiment of the present application;

[0033] Figure 6A schematic diagram of the structure of a triode provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of the structure of a photographing device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0036] The embodiment of the present application provides a brightness control device 1, referring to Figure 1 As shown, the device comprises: a power supply module 11, a photosensitive component 12, a waveform generation circuit module 13 for generating a pulse width modulation PWM waveform, and a light emitting module 14 comprising one or more light emitting diodes LED; wherein:

[0037] The power supply module 11 is used to provide working power to the waveform generation circuit module;

[0038] In the embodiment of the present application, the power module is a power supply device used to provide working power for the entire brightness control device, which can be a storage power supply, or a mains DC power supply or AC power supply.

[0039] The photosensitive component 12 is used to control the waveform generation circuit module 13 to generate a first working signal with a high and low level duty ratio matching the ambient light brightness based on the detected photosensitive working parameters matching the ambient light brightness of the environment where the brightness control device is located;

[0040] In an embodiment of the present application, the photosensitive component is a component that is sensitive to ambient light. Under the influence of ambient light, its circuit operating parameters will change. Therefore, the high and low level duty ratios of the pulse width modulation (PWM) generated by the waveform generation circuit module can be controlled to obtain a first working signal.

[0041] The waveform generating circuit module 14 is used to control the light emitting brightness of the light emitting module based on the first working signal.

[0042] In the embodiment of the present application, the waveform generation circuit module provides the working parameters of the working voltage and current for the light-emitting module based on the first working signal, thereby realizing the regulation of the light brightness of one or more LED lamps included in the light-emitting module.

[0043] It should be noted that the brightness control device does not include any computing components with computer computing capabilities, such as embedded control chips, microprocessors and other chips. It is a pure hardware circuit structure, that is, the ambient light brightness sensed by the photosensitive components does not need to be calculated by components with computing functions. Similarly, the waveform generation circuit does not include computing components with computing capabilities.

[0044] The brightness control device provided in the embodiment of the present application includes a power supply module, a photosensitive component, a waveform generation circuit module for generating a PWM waveform, and a light-emitting module including one or more LEDs, wherein the power supply module is used to provide a working power supply for the waveform generation circuit module, the photosensitive component is used to control the waveform generation circuit module to generate a first working signal of a high and low level duty ratio matching the ambient light brightness based on the detected photosensitive working parameters matching the ambient light brightness of the environment in which the brightness control device is located, and the waveform generation circuit module is used to control the light-emitting brightness of the light-emitting module based on the first working signal. In this way, PWM generates a corresponding first working signal to control the light-emitting brightness of the light-emitting block according to the photosensitive working parameters detected by the photosensitive component, realizing a technical solution for controlling the brightness of the light-emitting LED through hardware, solving the problem that the current processor and backlight driver IC are required to adjust the brightness of the LED lamp, and proposing a hardware device for adjusting the brightness of the LED lamp without the processor and backlight driver IC, which can adjust the brightness of the LED lamp in real time according to the ambient light brightness, and ensures the real-time and reliability of the brightness adjustment of the LED lamp.

[0045] Based on the above embodiments, an embodiment of the present application provides a brightness control device, which includes: a power supply module, a photosensitive component, a waveform generation circuit module for generating a pulse width modulation (PWM) waveform, and a light-emitting module including one or more light-emitting diodes (LEDs); wherein:

[0046] A power supply module, used for providing working power to the waveform generation circuit module;

[0047] In the embodiment of the present application, the power module is taken as an energy storage power module, that is, a battery, and the battery provides working power for the waveform generating circuit, that is, the power module is electrically connected to the power input terminal of the waveform generating circuit module.

[0048] A photosensitive component, for controlling the waveform generation circuit module to generate a first working signal with a high and low level duty ratio matching the ambient light brightness based on a photosensitive working parameter matching the ambient light brightness of the environment where the brightness control device is located;

[0049] In an embodiment of the present application, the photosensitive component is placed in a spatial environment where the brightness of the light-emitting module needs to be changed, where the brightness of the brightness control device is located. In this way, the photosensitive component can obtain a first working signal based on a waveform signal generated by a waveform generation circuit module according to the ambient light brightness control.

[0050] The waveform generating circuit module is used to control the light emitting brightness of the light emitting module based on the first working signal.

[0051] In the embodiment of the present application, the waveform generating circuit module provides a first working signal to the light emitting module, so that the light emitting module emits light under the control of the first working signal.

[0052] Based on the foregoing embodiment, in other embodiments of the present application, the waveform generation circuit module at least includes an astable multivibrator circuit; wherein:

[0053] The photosensitive element is connected in series with an RC circuit in the astable multivibrator circuit.

[0054] In the embodiment of the present application, a resistor-capacitance circuit (RC) is used. In this way, the photosensitive component has different corresponding working parameters under different ambient light. The working parameters in the RC circuit are adjusted to achieve the adjustment of the high and low level duty cycle of the first working signal.

[0055] Based on the above embodiments, in other embodiments of the present application, refer to Figure 2 As shown, the device also includes: a signal amplification circuit module 15; wherein:

[0056] The power supply module 11 is also used to provide working power for the signal amplification circuit module;

[0057] The signal amplifying circuit module 15 is used to amplify the first working signal output by the waveform generating circuit module 14 to obtain a second working signal, so as to control the light emitting brightness of the light emitting module through the second working signal.

[0058] In an embodiment of the present application, the signal input end of the signal amplification circuit module is connected to the signal output end of the waveform generation circuit module. In this way, after the waveform generation circuit module outputs the first working signal, the first working signal is amplified to ensure that the light-emitting module can work normally, that is, to provide stable working parameters for the light-emitting module.

[0059] Based on the above embodiments, in other embodiments of the present application, the signal amplification circuit module includes: an oscillation amplification circuit; wherein:

[0060] The signal input end of the oscillation amplifier circuit is connected to the output end of the waveform generation circuit module.

[0061] In the embodiment of the present application, the signal amplifying circuit module is specifically implemented by an oscillating amplifying circuit.

[0062] Based on the above embodiments, in other embodiments of the present application, refer to Figure 3 As shown, the device also includes: a boost circuit module 16; wherein:

[0063] An input end of the boost circuit module 16 is connected to an output end of the waveform generating circuit module 14 .

[0064] In the embodiment of the present application, the structure of the brightness control device includes: a power supply module, a photosensitive component, a waveform generation circuit module for generating a pulse width modulation (PWM) waveform, a boost circuit module, and a light-emitting module including one or more light-emitting diodes (LEDs). In this way, when the first working signal output by the waveform generation circuit module is small and insufficient to support the operation of the light-emitting module, the first working signal is boosted by the boost circuit module to ensure the normal operation of the light-emitting module.

[0065] Based on the above embodiments, in other embodiments of the present application, refer to Figure 4 As shown, the device also includes: a boost circuit module 16; wherein:

[0066] An input end of the boost circuit module 16 is connected to an output end of the signal amplifying circuit module 15 .

[0067] In the embodiment of the present application, the structure of the brightness control device includes: a power supply module, a photosensitive component, a waveform generation circuit module for generating a pulse width modulation (PWM) waveform, a signal amplification circuit module, a boost circuit module, and a light-emitting module including one or more light-emitting diodes (LEDs). In this way, when the first working signal output by the waveform generation circuit module is small and insufficient to support the operation of the light-emitting module, the first working signal is amplified by the signal amplification circuit module, and the amplified first working signal is boosted by the boost circuit module to ensure the normal operation of the light-emitting module.

[0068] Based on the foregoing embodiments, in other embodiments of the present application, the boost circuit module 16 is used to boost the brightness control signal input to the light-emitting module; wherein the brightness control signal is the first working signal of the waveform generating circuit module, or the second working signal output by the signal amplifying circuit module.

[0069] Based on the above embodiments, in other embodiments of the present application, the boost circuit module includes a boost chopper circuit; wherein:

[0070] The output end of the boost chopper circuit is connected to the input end of the light emitting module.

[0071] In the embodiment of the present application, the boost circuit module may specifically be composed of a boost chopper circuit, so that stable operating parameters can be provided for the light-emitting module to ensure the normal operation of the light-emitting module.

[0072] Based on the foregoing embodiments, in other embodiments of the present application, the photosensitive component at least includes: a photoresistor.

[0073] Based on the above embodiments, the present application provides a brightness control device, which directly uses pure hardware to adjust the brightness of the LED lamp according to the ambient light brightness. The corresponding hardware circuit structure can be as follows: Figure 5 As shown, it can be specifically divided into five parts, namely: a photoresistor RL1, a non-steady-state multivibrator circuit for generating a PWM oscillation waveform, an oscillation amplifier circuit for amplifying the PWM waveform, a switching DC (boost) boost circuit for boosting the amplified PWM wave, and an LED lamp circuit including X LED lamps connected in series.

[0074] in:

[0075] The resistance of the photoresistor RL1 is negatively correlated with the light intensity it receives, that is, the stronger the light intensity, the smaller the resistance, and the weaker the light intensity, the larger the resistance. The photoresistor RL1, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the capacitor C1, the capacitor C2, the transistor Q1 and the transistor Q2 together form an astable multivibrator circuit, which can continuously generate a PWM waveform. Among them, the transistors Q1 and Q2 can be NPN transistors, and the structure of the transistor can be as follows Figure 6 The working principle of the transistor is: when the voltage difference between the base and emitter of the transistor is greater than a certain value, such as 0.7V for a silicon tube, the emitter and collector are connected, and the emitter and collector are at the same level, otherwise they are disconnected.

[0076] In this way, the astable multivibrator circuit has two states: one state is Q1 on and Q2 off; the other state is Q1 off and Q2 on. In the application process, these two states of the astable multivibrator circuit will continue to change alternately, so the high and low levels will appear alternately on the collector of Q1 / Q2, so that two PWM square wave signals with opposite phases can be output. Among them, the frequency and duty cycle of the output PWM square wave signal are usually related to the RC charging network composed of RL1, R1 and C1, and R2 and C2 respectively. The specific principle can be shown as follows:

[0077] When Q2 is off and Q1 is on, it is assumed that the voltage difference between the base and emitter of Q1 is 0.7V, where: the emitter of Q1 is grounded, and the emitter level can be determined to be 0V, so the base level of Q1 is 0.7V, so the level of the left end of C1 is 0.7V; since Q2 is off, the right end of C1 will be charged by the power module VCC through R4 to become the VCC level. It should be noted that at this time, the base of Q3 is the high level of VCC, so Q3 is turned on; since the level of the right end of C1 is VCC, relative to the level of 0.7V at the left end of C1, the corresponding The voltage difference is VCC-0.7V; since Q2 is cut off, the voltage at the right end of C2 is less than 0.7V, because Q1 is turned on, at this time the level at the left end of C2 is the same as the collector level of Q1, but since VCC will charge C2 to the right end of C2 through R2, its level will gradually increase with the extension of charging time. When it rises to 0.7V, Q2 is turned on. At this time, the collector of Q2 becomes the same 0V level as the emitter. At this time, the base of Q3 also becomes a 0V level, and the state of Q3 is switched to cut off. At the same time, the level of the right end of C1 also changes becomes 0V; since the voltage difference across the capacitor cannot change suddenly, the voltage difference between the right end of C1 and the left end is VCC-0.7V. When the level of the right end of C1 becomes 0V, the level of its left end becomes 0V-(VCC-0.7V)=0.7V-VCC. At this time, Q1 will be quickly cut off, thus switching to another state where Q1 is cut off and Q2 is turned on. In this way, the level of the right end of C2 is 0.7V, and the level of the left end of C2 will be charged from VCC through R3 to VCC due to the cut-off of Q1. The voltage difference between the left end of C2 and the right end becomes VCC-0.7V. At this time, due to Q2 is turned on, the level at the right end of C1 becomes 0V, and its left end will be charged by VCC through RL1 and R1, and its level will gradually increase from 0.7V-VCC. When its level increases to 0.7V, Q1 is turned on, and the level at the left end of C2 becomes 0V. Since its voltage difference cannot change suddenly, the level at the right end becomes 0V-(VCC-0.7V)=0.7V-VCC, Q2 is turned off, and returns to state 1. After that, the whole circuit switches back and forth between the above two states, so that two square wave signals with opposite phases appear on the collectors of Q1 and Q2.

[0078] It should be noted that the high and low level times of the two square wave signals with opposite phases appearing on the collectors of Q1 and Q2 are related to the time T1 when the left end level of C1 is charged from the level 0.7-VCC to the level 0.7V through RL1 and R1, and the time T2 when the right end level of C2 is charged from the level 0.7-VCC to the level 0.7V through R2.

[0079] For the square wave generated on the collector of Q2, Q2 is cut off when the level is high. At this time, C2 will be charged through R2. After charging for T2 time, Q2 is turned on, and the collector of Q2 becomes a low level. Then C1 is charged through RL1 and R1. After T1 time, Q2 will be cut off again. Therefore, the high level time on the collector of Q2 is T2, and the low level time is T1.

[0080] According to the relationship between the voltage Vt on the capacitor of the RC network and the charging time T, it can be expressed by the following calculation formula: T = RC*Ln[(Vcc-V0) / (Vcc-Vt)], where RC is the resistance and capacitance value in the RC network, Ln is the natural logarithm calculation formula, Vcc is the power supply for capacitor charging, V0 is the starting voltage value of capacitor charging, and Vt is the corresponding voltage value after the capacitor is charged for T. In this way, based on the relationship between the voltage Vt on the capacitor of the RC network and the charging time T, it can be determined Figure 5 In the circuit structure shown, the following relationship between T1 and T2 can be determined:

[0081] T1=(RL1+R1)*C1×Ln[(VCC-(0.7-VCC)) / (VCC-0.7)]

[0082] =(RL1+R1)*C1×Ln[(2VCC-0.7) / (VCC-0.7)];

[0083] T2=R2*C2×Ln[(VCC-(0.7-VCC)) / (VCC-0.7)]

[0084] =R2*C2×Ln[(2VCC-0.7) / (VCC-0.7)].

[0085] In the calculation formula of T1 and T2, [(2VCC-0.7) / (VCC-0.7)] is a fixed value related to VCC, which can be simplified to J(Vcc). In this way, the calculation formula of T1 and T2 can be shown as follows:

[0086] T1=(RL1+R1)*C1×J(Vcc)

[0087] T2=R2*C2×J(Vcc)

[0088] In the T1 calculation formula, R1, C1 and J (Vcc) are all determinable values, and only RL1 is a value that changes with light intensity. When the light intensity becomes stronger, RL1 becomes smaller, and when the light intensity becomes weaker, RL1 becomes larger. Therefore, T1 will become smaller as the light intensity becomes stronger, and become larger as the light intensity becomes weaker. The two are in a negative correlation. In the T1 calculation formula, R2, C2 and J (Vcc) are all determinable values. Therefore, when R2, C2 and J (Vcc) are fixed, T2 is also a fixed value. In this way, the high level time T2 on the collector of Q2 can be fixed, while the low level time T1 will change with the change of light intensity, and it is a negative correlation relationship. The stronger the light intensity, the smaller T1, that is, the greater the duty cycle of the PWM high level, and the weaker the light intensity, the larger T1, that is, the smaller the duty cycle of the PWM high level. The PWM wave is amplified by Q3 and acts on the transistor Q4. It can be seen from the circuit that when the PWM is high, Q3 is turned on, and there is current on the resistor R5, so the upper end of R5 becomes a high level, so Q4 is also turned on. When the PWM is low, Q3 is turned off, and there is no current on the resistor R5, so the upper end of R5 becomes a 0V level, so Q4 is also turned off. Among them, Q4 can be an N-type metal-oxide-semiconductor (N-Metal-Oxide-Semiconductor, NMOS) tube, or an NPN-type transistor, or other types of transistors, which are not specifically limited here.

[0089] In this way, when Q4 is turned on, the inductor L10 will be charged through the loop composed of VCC, Q4 and GND. Based on the inductor charging formula, it can be known that the voltage difference between its two ends will gradually increase with Ut0, which can be recorded as: In the formula, L10 is the inductance value, i is the instantaneous current flowing through the inductor, and t2 is the charging time. According to the calculation formula of Ut0, it can be determined that the voltage difference across the inductor is strongly related to the charging time t2. Ut0 will increase as t2 increases. Assuming that it can eventually be boosted to U0, it should be noted that the U0 voltage value is determined by the values ​​of L10, R1, R2, C1, C2, and VCC. In this way, different U0s can drive different numbers of LED lights. When Q4 is turned off, the inductor L10 stops charging. At the same time, according to the inductor characteristics, it will discharge from U0 to the back end with a voltage drop of Ut1. The discharge formula can be recorded as From the discharge formula, we can know that Ut1 will increase as t1 increases, that is, the voltage drop will increase as t1 increases, and the voltage will drop lower and lower. It is assumed that it will eventually drop to U1.

[0090] In the boost circuit, C3 is a storage capacitor that supplies power to the rear LED lamp when L10 is charged. Correspondingly, in the embodiment of the present application, the power supply time is determined to be T2, and C3 is charged when L10 is discharged. The charging voltage of C3 is between U0 and U1. In the embodiment of the present application, the charging time of C3 is T1. It can be seen from the above description that the stronger the light intensity, the smaller T1, and the shorter the charging time of the corresponding capacitor C3, and the less electrical energy it can store. When the light intensity is weaker, the larger T1 is, the longer the charging time of C3 is, and the more electrical energy it can store. The amount of electricity stored in C3 during charging directly determines the amount of electricity it can provide to the rear-end LED in the T2 time period. When the amount of electricity stored on C3 is more, the current that can power the LED is also greater, and the brightness of the LED lamp is also higher. Conversely, when the amount of electricity stored on C3 is less, the current that can power the LED is also smaller, and the brightness of the LED lamp is also lower. In this way, when the photoresistor RL1 detects that the higher the ambient light brightness is, the lower the brightness of the LED lamp is, and when the photoresistor RL1 detects that the ambient light brightness is lower, the brightness of the LED lamp is higher.

[0091] In this way, the brightness can be automatically adjusted according to the ambient light brightness by using only hardware components, without the intervention of the system on chip (SOC) and software algorithms. This is not only low-cost but also more responsive.

[0092] It should be noted that, for the description of the same modules or units in this embodiment as in other embodiments, reference can be made to the description in other embodiments and will not be repeated here.

[0093] The brightness control device provided in the embodiment of the present application includes a power supply module, a photosensitive component, a waveform generation circuit module for generating a PWM waveform, and a light-emitting module including one or more LEDs, wherein the power supply module is used to provide a working power supply for the waveform generation circuit module, the photosensitive component is used to control the waveform generation circuit module to generate a first working signal of a high and low level duty ratio matching the ambient light brightness based on the detected photosensitive working parameters matching the ambient light brightness of the environment in which the brightness control device is located, and the waveform generation circuit module is used to control the light-emitting brightness of the light-emitting module based on the first working signal. In this way, PWM generates a corresponding first working signal to control the light-emitting brightness of the light-emitting block according to the photosensitive working parameters detected by the photosensitive component, realizing a technical solution for controlling the brightness of the light-emitting LED through hardware, solving the problem that the current processor and backlight driver IC are required to adjust the brightness of the LED lamp, and proposing a hardware device for adjusting the brightness of the LED lamp without the processor and backlight driver IC, which can adjust the brightness of the LED lamp in real time according to the ambient light brightness, and ensures the real-time and reliability of the brightness adjustment of the LED lamp.

[0094] Based on the above embodiments, the present application also provides a photographing device, referring to Figure 7 As shown, the photographing device 2 at least includes: a camera 21, a memory 22, a processor 23, a communication bus 24 and Figures 1 to 7 The corresponding embodiment provides a brightness control device 25. The brightness control device 25 is the same device as the brightness control device 1 described above.

[0095] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A brightness control device, characterized in that: The device comprises: a power supply module, a photosensitive component, a waveform generation circuit module for generating a pulse width modulation (PWM) waveform, and a light emitting module comprising one or more light emitting diodes (LEDs); wherein: The power supply module is used to provide working power for the waveform generating circuit module; The photosensitive component is used to control the waveform generation circuit module to generate a first working signal with a high and low level duty ratio matching the ambient light brightness based on the detected photosensitive working parameter matching the ambient light brightness of the environment where the brightness control device is located; The waveform generating circuit module is used to control the light emitting brightness of the light emitting module based on the first working signal.

2. The device according to claim 1, characterized in that The waveform generation circuit module at least includes an astable multivibrator circuit; wherein: The photosensitive component is connected in series with an RC circuit in the astable multivibrator circuit.

3. The device according to claim 1, characterized in that The device further comprises: a signal amplification circuit module; wherein: The power supply module is also used to provide working power for the signal amplification circuit module; The signal amplifying circuit module is used to amplify the first working signal output by the waveform generating circuit module to obtain a second working signal, so as to control the light emitting brightness of the light emitting module through the second working signal.

4. The device according to claim 3, characterized in that The signal amplification circuit module includes: an oscillation amplification circuit; wherein: The signal input end of the oscillation amplifier circuit is connected to the output end of the waveform generation circuit module.

5. The device according to claim 1, characterized in that The device further comprises: a boost circuit module; wherein: The input end of the boost circuit module is connected to the output end of the waveform generating circuit module.

6. The device according to claim 3, characterized in that The device further comprises: a boost circuit module; wherein: The input end of the boost circuit module is connected to the output end of the signal amplifying circuit module.

7. The device according to claim 5 or 6, characterized in that The boost circuit module is used to boost the brightness control signal input to the light emitting module; wherein the brightness control signal is the first working signal of the waveform generating circuit module, or the second working signal output by the signal amplifying circuit module.

8. The device according to claim 7, characterized in that The boost circuit module includes a boost chopper circuit; wherein: The output end of the boost chopper circuit is connected to the input end of the light emitting module.

9. The device according to claim 1, characterized in that The photosensitive component at least includes: a photoresistor.

10. A photographing device, characterized in that: The shooting device at least comprises: a camera, a processor, a memory, a communication bus and the brightness control device according to any one of claims 1 to 9.

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