CN216697783U - Backlight adjustment circuit and remote control - Google Patents

Abstract

The application discloses a backlight adjustment circuit and a remote control. The backlight adjustment circuit includes a light sensing module, a main control module and a backlight driving module. The backlight driving module is configured with a backlight source; the light sensing module is used for sensing ambient light signals in real time. Generate a voltage signal and send the voltage signal to the main control module; the main control module is used to obtain the corresponding control signal according to the voltage signal, and send the control signal to the backlight drive module; the backlight drive module is used to adjust the backlight source according to the control signal. Backlight brightness. The present application can adjust the backlight brightness of the backlight source according to the ambient light signal, solves the problem of serious power consumption caused by the fixed backlight brightness in the prior art, saves power and energy, and prolongs the service life of the power supply.

Description

Backlight adjustment circuit and remote control

technical field

The present application relates to the field of electronic technology, and in particular to a backlight adjustment circuit and a remote control.

Background technique

With the improvement of people's quality of life, the remote control matched with electrical equipment has become an indispensable item in daily life.

In order to enable users to clearly see the information displayed on the display of the remote control when the light is dim at night, a remote control with a backlight has appeared on the market.

However, at present, the brightness of the backlight of the remote controller with a backlight is mostly fixed, and the fixed brightness of the backlight not only easily causes discomfort to the user's eyes, but also consumes a lot of power.

Utility model content

The present application provides a backlight adjustment circuit and a remote controller, aiming at solving the problem that the brightness of the backlight of the remote controller is fixed in the prior art, resulting in serious power consumption of the remote controller.

In a first aspect, the present application provides a backlight adjustment circuit, the backlight adjustment circuit includes a light sensing module, a main control module and a backlight driving module, the main control module is respectively electrically connected with the light sensing module and the backlight driving module, and the backlight driving module is configured with Backlight;

The light sensing module is used to generate a voltage signal according to the ambient light signal sensed in real time, and send the voltage signal to the main control module;

The main control module is used to obtain the corresponding control signal according to the voltage signal, and send the control signal to the backlight driving module;

The backlight driving module is used to adjust the backlight brightness of the backlight source according to the control signal.

In a possible implementation manner of the present application, the control signal is configured with a duty cycle parameter, and the backlight driving module is configured to adjust the on-time of the backlight source according to the duty cycle parameter of the control signal to adjust the backlight brightness of the backlight source.

In a possible implementation manner of the present application, the control signal includes a high-level signal and a low-level signal, and the duty cycle parameter is used to characterize the time duration occupied by the high-level signal in one cycle;

When the control signal is a high-level signal, the backlight is turned on to emit light; when the control signal is a low-level signal, the backlight is turned off and does not emit light.

In a possible implementation manner of the present application, the backlight source is a light emitting diode, the backlight driving module includes a first triode and a second triode, the main control module is connected to the base of the first triode, and the first triode The emitter of the diode is connected to the base of the second triode, the emitter of the second diode is grounded, the collector of the second triode is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to a power source.

In a possible implementation manner of the present application, the light sensing module includes a photosensitive unit and a voltage dividing unit, the photosensitive unit is electrically connected to the voltage dividing unit, and the connection between the photosensitive unit and the voltage dividing unit is electrically connected to the main control module;

The photosensitive unit is used to sense the ambient light signal in real time and convert the ambient light signal into a corresponding current signal;

The voltage dividing unit is used for generating a voltage signal according to the current signal, and sending the voltage signal to the main control module.

In a possible implementation manner of the present application, the photosensitive unit is a photosensitive sensor, the voltage dividing unit is a first resistor, the first end of the photosensitive sensor is connected to a power supply, and the second end of the photosensitive sensor is respectively connected to the first end of the first resistor and the main control module is connected, and the second end of the first resistor is grounded.

In a possible implementation manner of the present application, the light sensing module further includes a current limiting unit, and the connection between the light sensing unit and the voltage dividing unit is electrically connected to the main control module through the current limiting unit;

The current limiting unit is used to limit the current signal flowing into the main control module.

In a possible implementation manner of the present application, the current limiting unit is a second resistor, the first end of the second resistor is connected to the main control module, and the second end of the second resistor is connected to the connection between the photosensitive unit and the voltage divider unit .

In a second aspect, the present application further provides a remote controller, which includes the backlight adjustment circuit of the first aspect.

In a possible implementation manner of the present application, a brightness adjustment button is provided on the remote control, the brightness adjustment button is electrically connected to the main control module, and the brightness adjustment button is used to adjust the duty ratio parameter of the control signal.

It can be drawn from the above content that the present application has the following beneficial effects:

In this application, the ambient light signal is sensed by the light sensing module and a voltage signal is generated, and then the main control module obtains a control signal corresponding to the voltage signal according to the voltage signal, so that the backlight driving module adjusts the backlight source according to the control signal. Backlight brightness, the present application can adjust the backlight brightness of the backlight source according to the ambient light signal, solves the problem of serious power consumption caused by the fixed backlight brightness in the prior art, saves electricity and energy, and prolongs the service life of the power supply.

Description of drawings

In order to illustrate the technical solutions in the present application more clearly, the following briefly introduces the accompanying drawings used in the description of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, which are of great significance to the art As far as technical personnel are concerned, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic structural diagram of a backlight adjustment circuit provided in an embodiment of the present application;

2 is a schematic diagram of a circuit principle of a backlight driving module provided in an embodiment of the present application;

3 is a schematic diagram of a circuit principle of the light sensing module provided in the embodiment of the present application;

4 is a schematic structural diagram of a main control module provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a remote controller provided in an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation shown in the drawings Or the positional relationship is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the present application. In the following description, details are set forth for the purpose of explanation. It is to be understood that one of ordinary skill in the art can realize that the present application may be practiced without the use of these specific details. In other instances, well-known structures and procedures have not been described in detail so as not to obscure the description of the present application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Hereinafter, the backlight adjustment circuit and the remote controller provided by the present application will be introduced in detail.

First, the present application provides a backlight adjustment circuit. Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of the backlight adjustment circuit provided in an embodiment of the present application. The backlight adjustment circuit may include a light sensing module 100, a main control module 200 and a backlight driving module 300, wherein the main control module 200 is electrically connected to the light sensing module 100 and the backlight driving module 300 respectively, and the backlight driving module 300 is configured with a backlight source 301; the light sensing module 100 can be used to generate a voltage signal according to the ambient light signal sensed in real time, and send the voltage signal to the main control module 200; the main control module 200 can be used to obtain a corresponding control signal according to the voltage signal, and The control signal is sent to the backlight driving module 300; the backlight driving module 300 can be used to adjust the backlight brightness of the backlight source 301 according to the control signal.

Backlight is a form of lighting in the electronics industry. The difference between backlight and front light is that the backlight is illuminated from the side or behind, while the front light, as the name suggests, is illuminated from the front. Backlights can be used to increase illumination and display brightness in low-light environments.

It can be understood that the backlight adjustment circuit is an application circuit that can adjust the brightness of the backlight, which can be applied to any display screen with a display function, such as a remote control display screen, a computer monitor, and a liquid crystal screen.

The backlight source may be any of light source devices such as an incandescent light bulb, an electro-optic panel, a light-emitting diode (Light-Emitting Diode, LED), and a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL).

In this embodiment of the present application, the light sensing module 100 may be configured to generate a voltage signal according to the ambient light signal sensed in real time, and send the generated voltage signal to the main control module 200 . It can be understood that since the light sensing module 100 can generate a voltage signal according to the ambient light signal sensed in real time, the light sensing module 100 can receive the ambient light signal. Here, the ambient light signal can represent the environment in the current environment. The signal of brightness, that is, the ambient light signal, is a signal that can indicate the brightness of ambient light.

Since the ambient light signal when the ambient light brightness is strong is different from the ambient light signal when the ambient light brightness is weak, therefore, for different ambient light signals, the voltage signals generated by the light sensing module 100 are also different, and accordingly, The control signals obtained by the main control module 200 according to the voltage signals should also be different.

In order to enable the main control module 200 to output a control signal corresponding to the received voltage signal, in this embodiment of the present application, a signal matching table may be configured for the main control module 200, and the signal matching table may pre-correlate the recorded voltage signal with the control signal The correspondence between the signals, for example, what is recorded in the signal matching table may be the correspondence between the voltage value of the voltage signal and the signal parameter of the control signal.

When the main control module 200 receives the voltage signal, it can search in the signal matching table according to the voltage value of the voltage signal to find the signal parameter corresponding to the voltage value, and then generate the corresponding control signal according to the signal parameter and output it to The backlight driving module 300 .

After receiving the control signal, the backlight driving module 300 can adjust the backlight brightness of the backlight source 301 according to the control signal.

In the embodiment of the present application, the ambient light signal is sensed by the light sensing module 100 and a voltage signal is generated, and then the main control module 200 obtains a control signal corresponding to the voltage signal according to the voltage signal, so that the backlight driving module 300 according to the control signal The signal adjusts the backlight brightness of the backlight source 301, and the present application can adjust the backlight brightness of the backlight source according to the ambient light signal, which solves the problem of serious power consumption caused by the fixed backlight brightness in the prior art, saves power and energy, and prolongs the operation time. life of the power supply.

Please continue to refer to FIG. 1 , in some embodiments of the present application, the light sensing module 100 may include a photosensitive unit 101 and a voltage dividing unit 102 , the photosensitive unit 101 is electrically connected to the voltage dividing unit 102 , and the photosensitive unit 101 and the voltage dividing unit 102 are electrically connected The junction is electrically connected to the main control module 200; the photosensitive unit 101 can be used to sense the ambient light signal in real time, and convert the ambient light signal into a corresponding current signal; the voltage dividing unit 102 can be used to generate a voltage signal according to the current signal, and The voltage signal is sent to the main control module 200 .

It can be understood that the photosensitive unit 101 may be a sensitive device with a response or conversion function to ambient light signals. In this embodiment of the present application, the photosensitive unit 101 may be any existing photosensitive sensor, including but not limited to photocells, photosensitive Resistors, photodiodes, phototransistors or photocouplers, etc., are not specifically limited here.

The photosensitive unit 101 can be a device made by using the photoelectric effect of semiconductors whose resistance value changes with the intensity of incident light. When the ambient light signal is strong, that is, when the ambient light is brighter, the resistance value of the photosensitive unit 101 decreases. At this time, the current signal increases; on the contrary, when the ambient light signal is weak, that is, when the ambient light brightness is dark, the resistance value of the photosensitive unit 101 increases, and accordingly, the current signal decreases.

In the embodiment of the present application, the voltage dividing unit 102 may be an electronic device with a fixed resistance value, which is connected in series with the photosensitive unit 101. When the ambient light signal is strong and the resistance value of the photosensitive unit 101 decreases, the current signal increases, and the current signal increases. The voltage signal across the voltage divider unit 102 connected in series with the photosensitive unit 101 also increases; on the contrary, when the ambient light signal is weak and the resistance value of the photosensitive unit 101 increases, the current signal decreases, and the voltage divider in series with the photosensitive unit 101 The voltage signal across cell 102 also decreases.

As shown in FIG. 3 , FIG. 3 is a schematic diagram of a circuit principle of a photosensitive module provided in an embodiment of the present application. In some embodiments of the present application, the photosensitive unit 101 is a photosensitive sensor PSR1 , and the voltage dividing unit 102 is a first resistor R1 , the circuit structure of the light sensing module 100 is as follows:

The first end of the photosensitive sensor PSR1, that is, the anode, is connected to the +5V power supply, the second end of the photosensitive sensor PSR1, that is, the cathode, is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is grounded, that is, the photosensitive sensor PSR1 and the The first resistor R1 whose second terminal is grounded is connected in series, and the cathode of the photosensitive sensor PSR1 is also connected to any input/output (I/O) port of the main control module 200 through the output terminal PSR, so as to pass the output terminal PSR The voltage signal is sent to the main control module 200 .

Please refer to FIG. 4 together. FIG. 4 is a schematic structural diagram of the main control module provided in the embodiment of the present application. The main control module 200 can select the main chip U1 whose model is SH77P1651, and the output end PSR of the light sensing module 100 can be connected with the main control module Any I/O port of the chip U1 is connected, such as the P0.6 port shown in Figure 4, that is, the 37th pin.

The photosensitive sensor PSR1 senses the change of ambient light brightness in real time. With the change of the ambient light brightness, the resistance value of the photosensitive sensor PSR1 will change accordingly. When the ambient light brightness becomes brighter, the resistance value of the photosensitive sensor PSR1 will decrease accordingly. The current of the photosensitive sensor PSR1 will increase accordingly, and the partial pressure of the first resistor R1 will increase accordingly; when the ambient light brightness becomes dark, the resistance value of the photosensitive sensor PSR1 will increase accordingly, and the current of the photosensitive sensor PSR1 will increase with the If it decreases, the partial pressure of the first resistor R1 decreases accordingly.

As shown in FIG. 1 , in some embodiments of the present application, the photosensitive module 100 may further include a current limiting unit 103 , and the connection between the photosensitive unit 101 and the voltage dividing unit 102 is electrically connected to the main control module 200 through the current limiting unit 103 ; The current limiting unit 103 may be used to limit the current signal flowing into the main control module 200 .

Specifically, as shown in FIG. 3 , the current limiting unit 103 is a second resistor R2, the first end of the second resistor R2 is connected to the main control module 200 through the output end PSR, and the second end of the second resistor R2 is connected to the photosensitive sensor PSR1 It can also be considered that the second end of the second resistor R2 is connected to the cathode of the photosensor PSR1, or the second end of the second resistor R2 is connected to the first end of the first resistor R1. .

In this embodiment of the present application, in order to prevent the main chip U1 from being damaged due to an excessively large current signal transmitted to the main chip U1 , the current signal may be limited by the second resistor R2 to protect the main chip U1 .

In some embodiments of the present application, the control signal may be configured with a duty cycle parameter, and the backlight driving module 300 may be configured to adjust the on-time of the backlight source 301 according to the duty cycle parameter of the control signal, so as to adjust the backlight brightness of the backlight source 301 .

When the main control module 200 receives the voltage signal, it outputs a control signal corresponding to the voltage signal to the backlight driving module 300. Specifically, the main control module 200 can find the duty cycle parameter associated with the voltage signal according to the voltage signal , and then output a corresponding control signal based on the duty cycle parameter, so that the backlight driving module 300 can adjust the on-time of the backlight source 301 according to the control signal of the duty cycle parameter.

It can be understood that the control signal can include a high-level signal and a low-level signal, and the duty cycle parameter can be used to characterize the duration of a high-level signal in a cycle, where a cycle can be considered as a high-level signal. The sum of the duration of a high-level signal and the duration of a low-level signal.

The backlight driving module 300 adjusts the on-time of the backlight 301, which may be that when the control signal is a high-level signal, the backlight 301 is turned on to emit light; when the control signal is a low-level signal, the backlight 301 is turned off and does not emit light.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of a circuit principle of a backlight driving module provided in an embodiment of the present application. In some embodiments of the present application, the backlight source 301 is a light-emitting diode (LED), and the backlight driving module 300 may include a first three-pole The transistor Q1 and the second transistor Q2, the circuit structure of the backlight driving module 300 is:

The P0.5 port of the main chip U1 shown in FIG. 4, that is, the 38th pin, can be connected to the input port BLLED of the backlight driving module 300. The input port BLLED is connected to the first end of the third resistor R3 and the second end of the third resistor R3. The terminal is connected to the base of the first transistor Q1, the collector of the first transistor Q1 is connected to the power supply VCC through the fourth resistor R4, and the emitter of the first transistor Q1 is connected to the second transistor through the sixth resistor R6 The base of Q2, and the emitter of the first transistor Q1 is also connected to a second grounded fifth resistor R5, the emitter of the second diode Q2 is grounded, and the collector of the second transistor Q2 is connected to the ground. The cathode of the light-emitting diode LED is connected, and the anode of the light-emitting diode LED is connected to the power supply VCC.

It can be understood that the power supply VCC can be the power supply of the remote control or display used by the backlight adjustment circuit, which can provide 5V or 3V voltage. It should be noted that the voltage value provided by the power supply VCC can be set according to the actual application scenario. , which is not specifically limited here.

In the embodiment of the present application, when the P0.5 port of the main chip U1 outputs a high-level signal, the first transistor Q1 is turned on, and the second transistor Q2 is also turned on. At this time, the light-emitting diode LED Turn on and emit light; on the contrary, when the P0.5 port of the main chip U1 outputs a low level signal, the first transistor Q1 is turned off, the second transistor Q2 is also turned off, and the light-emitting diode LED is turned off and does not emit light.

When the duty cycle parameter of the control signal is larger, the proportion of the high-level signal in one cycle is larger, that is, the output time of the high-level signal is longer. On the contrary, when the duty cycle parameter of the control signal is smaller, the proportion of the high-level signal in one cycle is smaller, that is, the output time of the high-level signal is shorter. The shorter the lighting time, the lower the backlight brightness.

Please continue to refer to FIG. 2, the collector of the second transistor Q2 is also connected to the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is connected to the cathode of the light emitting diode LED. It can be understood that the seventh resistor R7 can be It acts as a current limiting resistor to protect the light-emitting diode LED, so as to avoid excessive current flowing to the light-emitting diode LED from damaging the light-emitting diode LED.

As shown in FIG. 5 , FIG. 5 is a schematic structural diagram of a remote controller provided in an embodiment of the present application. On the basis of the above embodiments, the present application further provides a remote controller 500, and the remote controller 500 may include the backlight adjustment circuit of any of the above embodiments. Through the backlight adjustment circuit, the backlight brightness of the display area of the remote control, such as the display screen, can be adjusted in real time according to the brightness of the ambient light.

In the specific implementation, the backlight adjustment circuit is applied to the remote control. When the brightness of the ambient light is brighter, the voltage signal is larger, and the duty cycle parameter of the control signal corresponding to the larger voltage signal is also larger. The brighter the backlight allows the user to quickly find the remote control during the day, based on the brighter backlight of the display.

When the ambient light brightness is darker, the voltage signal is smaller, and the duty cycle parameter of the control signal corresponding to the smaller voltage signal is also smaller, and the backlight brightness is darker. , not only can see the display screen clearly, but will not be irradiated by strong light, which will cause discomfort to the eyes and improve the user experience.

Please continue to refer to FIG. 5 , in some embodiments of the present application, the remote control 500 is provided with a brightness adjustment button 501 , the brightness adjustment button 501 is electrically connected to the main control module 200 , and the brightness adjustment button 501 can be used to adjust the proportion of the control signal. Empty ratio parameter.

In the embodiment of the present application, the backlight brightness of the display screen of the remote control 500 can be adjusted manually through the brightness adjustment button 501 in addition to being automatically adjusted according to the brightness of the ambient light.

Specifically, the main control module 200 may preset an association record table between duty cycle parameters and backlight brightness, and the association record table may record the corresponding relationship between a plurality of duty cycle parameters and backlight brightness. For example, the backlight brightness is 100 % can correspond to the duty cycle parameter such as "10:1", where 10 corresponds to the output duration of the high-level signal, and 1 corresponds to the output duration of the low-level signal; the backlight brightness of 50% can correspond to the duty cycle For example, the parameter is "5:1". Similarly, 5 corresponds to the output duration of the high-level signal, and 1 corresponds to the output duration of the low-level signal.

The user can select the desired display backlight brightness through the brightness adjustment button 501, and the main control module 200 can find the corresponding duty cycle parameter according to the backlight brightness selected by the user, so as to output a control signal to the backlight driver based on the duty cycle parameter. The module 300 is used to adjust the backlight brightness of the backlight source 301 .

It can be understood that the remote control 500 may also be provided with a selection button for selecting a brightness adjustment mode, and through the selection button, the user can select automatic adjustment or manual adjustment of the backlight brightness according to actual needs.

In addition, when the ambient light is bright or the battery of the remote control is insufficient, the user can also adjust the backlight brightness to 0% through the brightness adjustment button 501, that is, turn off the backlight source 301, so as to reduce energy consumption and prolong battery life. Therefore, this In the embodiment of the application, the brightness adjustment of the display screen backlight in the range of 0%-100% brightness variation can be realized through the brightness adjustment button 501 .

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the above detailed description of other embodiments, and details are not repeated here.

During specific implementation, the above units or structures can be implemented as independent entities, or can be arbitrarily combined to be implemented as the same or several entities. The specific implementation of the above units or structures can refer to the previous embodiments. Repeat.

The above provides a detailed introduction to a backlight adjustment circuit and a remote control provided by the present application. The principles and implementations of the present application are described with specific examples in this article. At the same time, for those skilled in the art, according to the idea of the application, there will be changes in the specific implementation and application scope. In conclusion, the content of this specification should not be construed as a limitation to the application.

Claims (10)

1. A backlight adjustment circuit, characterized in that it comprises a light sensing module, a main control module and a backlight driving module, wherein the main control module is electrically connected with the light sensing module and the backlight driving module respectively, and the backlight drives The module is configured with a backlight; The light sensing module is configured to generate a voltage signal according to the ambient light signal sensed in real time, and send the voltage signal to the main control module; the main control module, configured to obtain a corresponding control signal according to the voltage signal, and send the control signal to the backlight driving module; The backlight driving module is configured to adjust the backlight brightness of the backlight source according to the control signal. 2 . The backlight adjustment circuit according to claim 1 , wherein the control signal is configured with a duty cycle parameter, and the backlight driving module is configured to adjust the duty cycle parameter according to the control signal. 3 . The on-time of the backlight source to adjust the backlight brightness of the backlight source. 3. The backlight adjustment circuit according to claim 2, wherein the control signal comprises a high-level signal and a low-level signal, and the duty cycle parameter is used to characterize the high-level signal in one cycle the length of time occupied; When the control signal is the high-level signal, the backlight is turned on to emit light; when the control signal is the low-level signal, the backlight is turned off and does not emit light. 4 . The backlight adjustment circuit according to claim 3 , wherein the backlight source is a light-emitting diode, the backlight driving module comprises a first transistor and a second transistor, and the main control module is connected to the The base of the first triode is connected, the emitter of the first triode is connected to the base of the second triode, the emitter of the second triode is grounded, and the second triode is grounded. The collector of the triode is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to a power source. 5 . The backlight adjustment circuit according to claim 1 , wherein the light sensing module comprises a photosensitive unit and a voltage dividing unit, the photosensitive unit is electrically connected to the voltage dividing unit, and the photosensitive unit is connected to the voltage dividing unit. 6 . The connection of the voltage dividing unit is electrically connected to the main control module; The photosensitive unit is used to sense the ambient light signal in real time, and convert the ambient light signal into a corresponding current signal; The voltage dividing unit is configured to generate the voltage signal according to the current signal, and send the voltage signal to the main control module. 6 . The backlight adjustment circuit according to claim 5 , wherein the photosensitive unit is a photosensitive sensor, the voltage dividing unit is a first resistor, the first end of the photosensitive sensor is connected to a power supply, and the photosensitive sensor is connected to a power source. 7 . The second end of the sensor is respectively connected to the first end of the first resistor and the main control module, and the second end of the first resistor is grounded. 7 . The backlight adjustment circuit according to claim 5 , wherein the light sensing module further comprises a current limiting unit, and the connection between the photosensitive unit and the voltage dividing unit is connected to the current limiting unit through the current limiting unit. 8 . The main control module is electrically connected; The current limiting unit is used to limit the current of the current signal flowing into the main control module. 8 . The backlight adjustment circuit according to claim 7 , wherein the current limiting unit is a second resistor, the first end of the second resistor is connected to the main control module, and the first end of the second resistor is connected to the main control module. 9 . The two ends are connected to the connection between the photosensitive unit and the voltage dividing unit. 9. A remote control, characterized in that, the remote control comprises the backlight adjustment circuit of any one of claims 1-8. 10 . The remote controller according to claim 9 , wherein a brightness adjustment button is provided on the remote controller, the brightness adjustment button is electrically connected with the main control module, and the brightness adjustment button is used to adjust all the 10 . The duty cycle parameter of the control signal.

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