Brightness adjusting circuit, air conditioner and brightness adjusting method

Abstract

The invention provides a brightness adjusting circuit, an air conditioner and a brightness adjusting method. The brightness adjusting circuit comprises a signal collecting module, a control module, a signal processing module and a power adjusting module. The signal acquisition module is used for acquiring environment illumination intensity and generating an illumination signal according to the environment illumination intensity; the control module is connected with the signal acquisition module and is used for generating a control signal according to the illumination signal; the signal processing module is connected with the control module and is used for amplifying the control signal to obtain an amplified signal; and the power adjusting module is respectively connected with the signal processing module and the display module and is used for generating a driving signal according to the amplified signal and adjusting the brightness of the display module through the driving signal. The brightness of the display module can be automatically adjusted, and the requirements of users for different brightness are met.

Description

Technical Field

[0001] The present invention relates to the technical field of brightness adjustment, and in particular to a brightness adjustment circuit, an air conditioner and a brightness adjustment method. Background Art

[0002] Most air conditioner display panels have a fixed brightness or a limited number of brightness adjustment levels. For example, some air conditioner display panels have a fixed brightness value and cannot be adjusted, while others can be adjusted, but usually only within a limited number of levels. Since the brightness of lights in different homes varies, the brightness of the air conditioner display panel may appear too bright or too dim. Therefore, fixed brightness or limited brightness adjustment levels cannot meet the user's brightness needs. Summary of the Invention

[0003] The present invention provides a brightness adjustment circuit, an air conditioner and a brightness adjustment method, aiming to solve the problem that the current brightness adjustment method of the air conditioner display panel cannot meet the needs of users.

[0004] In a first aspect, the present invention provides a brightness adjustment circuit, which includes a signal acquisition module, a control module, a signal processing module and a power adjustment module; the signal acquisition module is used to collect ambient light intensity and generate a light signal based on the ambient light intensity; the control module is connected to the signal acquisition module and is used to generate a control signal based on the light signal; the signal processing module is connected to the control module and is used to amplify the control signal to obtain an amplified signal; the power adjustment module is respectively connected to the signal processing module and the display module, and is used to generate a drive signal based on the amplified signal, and adjust the brightness of the display module through the drive signal.

[0005] Furthermore, a feedback module is included, which is connected to the signal processing module and the power regulation module respectively, and is used to generate a feedback signal according to the current of the display module.

[0006] Furthermore, the feedback module includes a first resistor, one end of the first resistor is connected to the power supply end, and the other end of the first resistor is connected to the power regulation module.

[0007] Furthermore, the signal processing module includes a first operational amplifier and a second operational amplifier; the non-inverting input and the inverting input of the first operational amplifier are both connected to the feedback module, and the output of the first operational amplifier is connected to the control module; the non-inverting input of the second operational amplifier is connected to the control module, the inverting input of the second operational amplifier is connected to the output of the second operational amplifier, and the output of the second operational amplifier is connected to the power regulation module.

[0008] Furthermore, the power regulation module includes a first switching tube and a second switching tube; the controlled pole of the first switching tube is connected to the output end of the second operational amplifier, the first pole of the first switching tube is connected to the feedback module, the second pole of the first switching tube is connected to the first pole of the second switching tube, the controlled pole of the second switching tube is connected to the control module, and the second pole of the second switching tube is connected to the display module.

[0009] Furthermore, the signal acquisition module includes a light sensor, which is connected to the control module and is used to collect ambient light intensity and generate a light signal according to the ambient light intensity.

[0010] In a second aspect, the present invention provides an air conditioner, comprising a display module and any one of the above-mentioned brightness adjustment circuits.

[0011] In a third aspect, the present invention provides a brightness adjustment method, wherein:

[0012] detecting a brightness adjustment mode of the air conditioner in real time, wherein the brightness adjustment mode includes a manual adjustment mode and an automatic adjustment mode;

[0013] If the brightness adjustment mode is the automatic adjustment mode, obtaining the ambient light intensity, and generating a driving signal based on the ambient light intensity;

[0014] The brightness value of the display module is adjusted by the driving signal.

[0015] The present invention discloses an air conditioner and a brightness adjustment method. The air conditioner includes a display module and a brightness adjustment circuit. The brightness adjustment circuit includes a signal acquisition module, a control module, a signal processing module and a power adjustment module. The signal acquisition module is used to collect ambient light intensity and generate a light signal based on the ambient light intensity. The control module can generate a control signal according to the light signal. The control signal is amplified by the signal processing module to form an amplified signal, and is formed into a driving signal by the power adjustment module. The driving signal is used to drive the display module and can linearly adjust the brightness of the display module, so that the brightness value of the display module can change with the change of the ambient light intensity, match the current brightness of the environment, and meet the user's demand for different brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a block diagram of a brightness adjustment circuit provided by an embodiment of the present invention;

[0018] Figure 2 is a block diagram of a brightness adjustment circuit provided by another embodiment of the present invention;

[0019] Figure 3 is a circuit diagram of a brightness adjustment circuit provided by an embodiment of the present invention;

[0020] Figure 4 is a block diagram of an air conditioner provided by one embodiment of the present invention;

[0021] Figure 5 is a flowchart of a brightness adjustment method provided by an embodiment of the present invention;

[0022] Figure 6 This is a first sub-flowchart of a brightness adjustment method provided by an embodiment of the present invention;

[0023] Figure 7 This is a second sub-flowchart of the brightness adjustment method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It will be understood that when used in this specification and the appended claims, the terms “include” and “comprising” indicate the presence of described features, integers, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components and / or groups thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing specific embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should further be understood that the term "and / or" as used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, including and including these combinations.

[0027] Furthermore, directional terms used herein, such as "up," "down," "front," "back," "left," "right," "inside," "outside," and "side," are used solely to refer to the accompanying drawings and the orientation of the product in use. Therefore, these directional terms are intended to illustrate and facilitate understanding of the present invention and are not intended to limit the present invention. Furthermore, in the accompanying drawings, similar or identical structures are denoted by the same reference numerals.

[0028] See also Figures 1 to 3 , Figure 1 is a block diagram of a brightness adjustment circuit 100 provided in one embodiment of the present invention; Figure 2 is a block diagram of a brightness adjustment circuit 100 provided in another embodiment of the present invention; Figure 3 FIG. 1 is a circuit diagram of a brightness adjustment circuit 100 provided by an embodiment of the present invention. Figure 1 As shown, the brightness adjustment circuit 100 includes a signal acquisition module 10, a control module 20, a signal processing module 30 and a power adjustment module 40; the signal acquisition module 10 is used to collect the ambient light intensity and generate a light signal according to the ambient light intensity; the control module 20 is connected to the signal acquisition module 10, and is used to generate a control signal according to the light signal; the signal processing module 30 is connected to the control module 20, and is used to amplify the control signal to obtain an amplified signal; the power adjustment module 40 is respectively connected to the signal processing module 30 and the display module 200, and is used to generate a driving signal according to the amplified signal, and adjust the brightness of the display module 200 through the driving signal.

[0029] Specifically, the air conditioner may include a display module 200 and a brightness adjustment circuit 100. The brightness adjustment circuit 100 is used to adjust the brightness value of the display module 200, such as adjusting the brightness value of the display module 200 based on the ambient light intensity or set parameters. The display module 200 is the display panel of the air conditioner and is used to display parameter information such as the temperature, humidity, and current mode of the air conditioner.

[0030] The brightness adjustment circuit 100 may include a signal acquisition module 10, a control module 20, a signal processing module 30, and a power adjustment module 40. The signal acquisition module 10 is used to collect ambient light intensity and generate a light signal based on the ambient light intensity. For example, the signal acquisition module 10 may be a sensor located outside the air conditioner, which is used to collect the ambient light intensity of the air conditioner's environment, convert the ambient light intensity into a light signal, and then send the light signal to the control module 20. In addition, the signal acquisition module 10 may also include a human-computer interaction module, which is used to interact with the user. For example, the user can manually set the brightness parameter of the air conditioner through a remote control or smart terminal, and the signal acquisition module 10 sends the brightness parameter to the control module 20. It can be understood that when the signal acquisition module 10 is configured with a sensor and a human-computer interaction module at the same time, the air conditioner can be configured with two brightness adjustment modes, namely manual adjustment mode and automatic adjustment mode. The air conditioner usually operates in one of the modes. When the air conditioner operates in manual adjustment mode, the brightness of the air conditioner is based on the brightness parameters manually set by the user. When the air conditioner operates in automatic adjustment mode, the brightness of the air conditioner can change with the change of ambient light intensity. For example, when the environment in which the air conditioner is located is darker, the brightness of the display module 200 will decrease. When the environment in which the air conditioner is located is brighter, the brightness of the display module 200 will increase.

[0031] The control module 20 may include a control chip U2, which may be an MCU. The control chip U2 may include multiple interfaces, such as an ADC interface and a DAC interface, which are respectively used to connect to the signal acquisition module 10 and the signal processing module 30. The control chip U2 may receive the light signal or brightness parameter output by the signal acquisition module 10, generate a control signal based on the light signal or brightness parameter, and output the control signal.

[0032] The signal processing module 30 is connected to the control module 20 and the power regulation module 40, respectively, and is used to connect the control module 20 and the power regulation module 40. It is used to sample and amplify the control signal to obtain an amplified signal, and output the amplified signal to the power regulation module 40. The power regulation module 40 is connected to the display module 200 and is used to control the startup and shutdown of the display module 200 and to adjust the brightness of the display module 200. In other words, the power regulation module 40 generates a drive signal based on the amplified signal and adjusts the brightness of the display module 200 through the drive signal.

[0033] In actual use, if the air conditioner is in automatic adjustment mode, the air conditioner generates a driving signal according to the ambient light intensity. The driving signal is used to drive the display module 200. When the ambient light intensity decreases, the corresponding driving signal will be weakened to reduce the brightness of the display panel. When the ambient light intensity increases, the corresponding driving signal will be enhanced to increase the brightness of the display panel.

[0034] As a further embodiment, a feedback module 50 is further included. The feedback module 50 is connected to the signal processing module 30 and the power regulation module 40 respectively, and is used to generate a feedback signal according to the current of the display module 200 .

[0035] The feedback module 50 is used to cooperate with the signal processing module 30 and the power regulation module 40 to form a closed-loop regulation. The feedback module 50 is connected to the signal processing module 30 and the power regulation module 40 respectively. It can collect the current signal of the display module 200 by collecting the current signal of the power regulation module 40, convert the current signal into a feedback signal, and then feed it back to the control module 20 through the signal processing module 30. The control module 20 adjusts the control signal based on the feedback signal to ensure that the brightness value of the display module 200 matches the ambient light intensity or matches the brightness parameter.

[0036] As a further embodiment, the feedback module 50 includes a first resistor R1 , one end of the first resistor R1 is connected to the power supply end, and the other end of the first resistor R1 is connected to the power regulation module 40 .

[0037] The feedback module 50 may include a first resistor R1, one end of the first resistor R1 is connected to the power supply end, and the other end of the first resistor R1 is connected to the power regulation module 40. The first resistor R1 is connected in series with the main circuit, that is, in series with the power regulation module 40, as a sampling resistor, and can convert the current of the display module 200 into a voltage difference ( Figure 3 V1-V2 in the figure provides a physical basis for the amplification of the signal processing module 30.

[0038] As a further embodiment, the signal processing module 30 includes a first operational amplifier U1-A and a second operational amplifier U1-B; the non-inverting input and the inverting input of the first operational amplifier U1-A are both connected to the feedback module 50, and the output of the first operational amplifier U1-A is connected to the control module 20; the non-inverting input of the second operational amplifier U1-B is connected to the control module 20, the inverting input of the second operational amplifier U1-B is connected to the output of the second operational amplifier U1-B, and the output of the second operational amplifier U1-B is connected to the power regulation module 40.

[0039] The signal processing module 30 may include a first operational amplifier U1-A and a second operational amplifier U1-B. The non-inverting input and the inverting input of the first operational amplifier U1-A are both connected to the feedback module 50. For example, the non-inverting input of the first operational amplifier U1-A is connected to one end of the first resistor R1, and the inverting input of the first operational amplifier U1-A is connected to the other end of the first resistor R1. The output of the first operational amplifier U1-A is connected to the control module 20. The first operational amplifier U1-A is used to extract the voltage difference across the first resistor R1 and then output a feedback signal proportional to the current of the display module 200, which is convenient for the control module 20 to collect.

[0040] The non-inverting input of the second operational amplifier U1-B is connected to the control module 20, the inverting input of the second operational amplifier U1-B is connected to its output, and the output of the second operational amplifier U1-B is also connected to the power regulation module 40. The second operational amplifier U1-B acts as a voltage follower. For example, the non-inverting input of the second operational amplifier U1-B is connected to the DAC interface of the MCU (receiving an analog control signal), and the output of the second operational amplifier U1-B is fed back to the inverting input to form a voltage follower, which is used to enhance the DAC output driving capability of the MCU. It can not only accurately follow the analog voltage signal output by the DAC (the output voltage is consistent with the input voltage), but also provide sufficient driving current for the power regulation module 40, ensuring that the conduction state of the power regulation module 40 can be accurately controlled, thereby realizing dynamic regulation of the current of the display module 200.

[0041] like Figure 3 As shown, Figure 3 The second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 and the first operational amplifier U1-A form a differential amplifier for extracting the voltage difference across the first resistor R1. Figure 3 It can be seen that the relationship between the first resistor R1 and the output signal of the first operational amplifier U1-A is:

[0042]

[0043] And V1-V2 can be obtained by formula (2):

[0044] V1-V2=R1·I R1 (2)

[0045] Substituting formula (2) into formula (1) yields Vout:

[0046] Vout=k·R1·I R1 (3)

[0047] Wherein, V1 and V2 are the voltage difference of the first resistor R1, R1 is the resistance value of the first resistor R1, and IR1 is the current value of the first resistor R1, and k is the gain coefficient.

[0048] As a further embodiment, the power regulation module 40 includes a first switch tube Q1 and a second switch tube Q2; the controlled pole of the first switch tube Q1 is connected to the output end of the second operational amplifier U1-B, the first pole of the first switch tube Q1 is connected to the feedback module 50, the second pole of the first switch tube Q1 is connected to the first pole of the second switch tube Q2, the controlled pole of the second switch tube Q2 is connected to the control module 20, and the second pole of the second switch tube Q2 is connected to the display module 200.

[0049] In which, the power regulation module 40 may include a first switch tube Q1 and a second switch tube Q2, wherein the first switch tube Q1 may be a MOS tube and the second switch tube Q2 may be a triode, then the gate of the first switch tube Q1 is connected to the output end of the second operational amplifier U1-B, the drain of the first switch tube Q1 is connected to the feedback module 50 (such as connected to the first resistor R1), the source of the first switch tube Q1 is connected to the emitter of the second switch tube Q2, the base of the second switch tube Q2 is connected to the control module 20, and the collector of the second switch tube Q2 is connected to the display module 200.

[0050] The gate of the first switching transistor Q1 is controlled by the signal output by the second operational amplifier U1-B. By varying the on-resistance, the drain-source current, and therefore the current of the display module 200, can be adjusted to achieve continuous brightness adjustment. The base of the second switching transistor Q2 is controlled by the control module 20. By turning it on and off, it powers the display module 200 on and off, and activates and deactivates the display in conjunction with brightness adjustment.

[0051] like Figure 3 As shown, the sixth resistor R6 is used to limit the base current of the second switch tube Q2 to prevent overcurrent damage. The eighth resistor R8 and the sixth resistor R6 are used to divide the voltage and set the conduction value of the second switch tube Q2. The seventh resistor R7 is a current-limiting resistor used to protect the display module from overcurrent burnout. The first diode LED is a light-emitting diode. The brightness value of the display module can be adjusted by adjusting the current of the first diode LED. The second switch tube Q2 is turned on and off according to the DISP-CONTROL signal. When the second switch tube Q2 is turned on, the display module 200 is in the working state. When the second switch tube Q2 is turned off, the display module 200 is in the off state. For example, when the display module 200 needs to be turned off, the control module 20 can control the start and stop of the display module 200 by controlling the conduction and cutoff of the second switch tube Q2.

[0052] As a further embodiment, the signal acquisition module 10 includes a light sensor U3 , which is connected to the control module 20 and is configured to collect ambient light intensity and generate a light signal according to the ambient light intensity.

[0053] The signal acquisition module 10 may include a light sensor U3, which is connected to the control module 20 and is used to collect the ambient light intensity, generate a light signal based on the ambient light intensity, and then send the light signal to the control module 20. In addition, the signal acquisition module 10 may also include a human-computer interaction module, which can receive user instructions through the human-computer interaction module to implement manual adjustment.

[0054] The present invention also provides an air conditioner, which includes a display module 200 and a brightness adjustment circuit 100 according to any one of the above embodiments, wherein the brightness adjustment circuit 100 includes a signal acquisition module 10, a control module 20, a signal processing module 30 and a power adjustment module 40; the signal acquisition module 10 is used to collect ambient light intensity and generate a light signal based on the ambient light intensity; the control module 20 is connected to the signal acquisition module 10 and is used to generate a control signal based on the light signal; the signal processing module 30 is connected to the control module 20 and is used to amplify the control signal to obtain an amplified signal; the power adjustment module 40 is respectively connected to the signal processing module 30 and the display module 200 and is used to generate a drive signal based on the amplified signal and adjust the brightness of the display module 200 through the drive signal.

[0055] Specifically, the air conditioner may include a display module 200 and a brightness adjustment circuit 100. The brightness adjustment circuit 100 is used to adjust the brightness value of the display module 200, such as adjusting the brightness value of the display module 200 based on the ambient light intensity or set parameters. The display module 200 is the display panel of the air conditioner and is used to display parameter information such as the temperature, humidity, and current mode of the air conditioner.

[0056] The brightness adjustment circuit 100 may include a signal acquisition module 10, a control module 20, a signal processing module 30, and a power adjustment module 40. The signal acquisition module 10 is used to collect ambient light intensity and generate a light signal based on the ambient light intensity. For example, the signal acquisition module 10 may be a sensor located outside the air conditioner, which is used to collect the ambient light intensity of the air conditioner's environment, convert the ambient light intensity into a light signal, and then send the light signal to the control module 20. In addition, the signal acquisition module 10 may also include a human-computer interaction module, which is used to interact with the user. For example, the user can manually set the brightness parameter of the air conditioner through a remote control or smart terminal, and the signal acquisition module 10 sends the brightness parameter to the control module 20. It can be understood that when the signal acquisition module 10 is configured with a sensor and a human-computer interaction module at the same time, the air conditioner can be configured with two brightness adjustment modes, namely manual adjustment mode and automatic adjustment mode. The air conditioner usually operates in one of the modes. When the air conditioner operates in manual adjustment mode, the brightness of the air conditioner is based on the brightness parameters manually set by the user. When the air conditioner operates in automatic adjustment mode, the brightness of the air conditioner can change with the change of ambient light intensity. For example, when the environment in which the air conditioner is located is darker, the brightness of the display module 200 will decrease. When the environment in which the air conditioner is located is brighter, the brightness of the display module 200 will increase.

[0057] The control module 20 may include a control chip U2, which may be an MCU. The control chip U2 may include multiple interfaces, such as an ADC interface and a DAC interface, which are respectively used to connect to the signal acquisition module 10 and the signal processing module 30. The control chip U2 may receive the light signal or brightness parameter output by the signal acquisition module 10, generate a control signal based on the light signal or brightness parameter, and output the control signal.

[0058] The signal processing module 30 is connected to the control module 20 and the power regulation module 40, respectively, and is used to connect the control module 20 and the power regulation module 40. It is used to sample and amplify the control signal to obtain an amplified signal, and output the amplified signal to the power regulation module 40. The power regulation module 40 is connected to the display module 200 and is used to control the startup and shutdown of the display module 200 and to adjust the brightness of the display module 200. In other words, the power regulation module 40 generates a drive signal based on the amplified signal and adjusts the brightness of the display module 200 through the drive signal.

[0059] In actual use, if the air conditioner is in automatic adjustment mode, the air conditioner generates a driving signal according to the ambient light intensity. The driving signal is used to drive the display module 200. When the ambient light intensity decreases, the corresponding driving signal will be weakened to reduce the brightness of the display panel. When the ambient light intensity increases, the corresponding driving signal will be enhanced to increase the brightness of the display panel.

[0060] like Figure 4 As shown, Figure 4 This is a block diagram of an air conditioner. The subtractor is the first operational amplifier U1-A, the voltage follower is the second operational amplifier U1-B, the sampling resistor is the first resistor R1, and the MOSFET is the first switch tube Q1, which is used to adjust the current of the display panel. The display panel is a display module. The anode drive, cathode drive and first switch tube Q1 construct a complete LED circuit. The anode drive is used to control the anode potential of the first light-emitting diode (such as providing a forward voltage), and the cathode drive is used to control the cathode potential of the LED (such as grounding or suspension). The anode drive, cathode drive and first switch tube Q1 are used to realize the lighting / extinguishing and brightness adjustment of the LED.

[0061] See also Figure 5 The present invention provides a brightness adjustment method, which can be applied to the air conditioner described in any one of the above embodiments, and is used to adjust the brightness value of the air conditioner display module. The brightness adjustment method includes S110-S130.

[0062] S110 , detecting a brightness adjustment mode of the air conditioner in real time, wherein the brightness adjustment mode includes a manual adjustment mode and an automatic adjustment mode.

[0063] In an embodiment of the present invention, the air conditioner can be configured with a manual adjustment mode and an automatic adjustment mode. In the manual adjustment mode, the user manually sets the brightness parameter of the air conditioner, that is, the target brightness parameter, through control instructions. In the automatic adjustment mode, the air conditioner automatically obtains the ambient light intensity and adjusts the brightness of the display module in real time based on the ambient light intensity.

[0064] When the air conditioner is started, it will run in one of the manual adjustment mode and automatic adjustment mode. The user can manually switch the brightness adjustment mode of the air conditioner through the control command. Under normal circumstances, the air conditioner runs in the automatic adjustment mode by default.

[0065] S120: If the brightness adjustment mode is the automatic adjustment mode, obtain the ambient light intensity, and generate a driving signal based on the ambient light intensity.

[0066] In an embodiment of the present invention, when the brightness adjustment mode is the automatic adjustment mode, the ambient light intensity is obtained, and a driving signal is generated based on the ambient light intensity. For example, the brightness adjustment circuit mentioned above can generate a light signal based on the ambient light intensity, and then generate a control signal based on the light signal. The control signal is amplified to obtain an amplified signal, and finally the amplified signal is converted into a driving signal.

[0067] S130: Adjust the brightness value of the display module using the driving signal.

[0068] In an embodiment of the present invention, after obtaining the driving signal, the brightness value of the display module can be adjusted by the driving signal, so that the brightness value of the display module matches the ambient light intensity, avoiding the brightness value of the display module being too bright or too dark, and linear adjustment of the brightness value can be achieved to meet the user's needs for different brightness.

[0069] See also Figure 6 In some embodiments, such as in this embodiment, the brightness adjustment method may further include step S140.

[0070] S140: If the brightness adjustment mode is the manual adjustment mode, a target brightness value is obtained, and the driving signal is generated based on the target brightness value, and the process proceeds to step S130.

[0071] In an embodiment of the present invention, when the brightness adjustment mode is manual adjustment mode, a target brightness value can be obtained, and then a driving signal can be generated based on the target brightness value. For example, a brightness parameter can be obtained through a human-computer interaction module, and then the target brightness value can be confirmed based on the brightness parameter. After the driving signal is generated, the process jumps to step S130.

[0072] See also Figure 7 In some embodiments, such as in this embodiment, the brightness adjustment method may further include steps S150-S152.

[0073] S150, confirming a target current value based on the ambient light intensity or the target brightness value, and obtaining a sampled current value;

[0074] S151, if the sampled current value is greater than the target current value, weakening the driving signal so that the sampled current value is the same as the target current value;

[0075] S152: If the sampled current value is smaller than the target current value, enhance the driving signal so that the sampled current value is the same as the target current value.

[0076] In the embodiment of the present invention, Figure 3As shown in the figure, let the target current value be Itar, the sampled current value be Itest, and the drive signal be Ictrl. If Itest > Itar, it indicates that the brightness of the display module is too high. Then, the drive signal Ictrl can be weakened, and then it is judged again whether the current reaches the target value. If Itest < Itar, it indicates that the brightness of the display module is too low. Then, the drive signal Ictrl is enhanced, and it is judged again whether the current reaches the target value. If Itest = Itar, it indicates that the brightness of the display module reaches the target state, and Ictrl is maintained, waiting for a new user instruction or a change in the ambient light intensity.

[0077] The brightness adjustment circuit, air conditioner, and brightness adjustment method disclosed in the present invention can generate a light signal according to the ambient light intensity, generate a control signal according to the light signal, obtain an amplified signal after amplifying the control signal, and convert the amplified signal into a drive signal. Then, the brightness of the display module is adjusted through the drive signal, enabling the brightness of the display module to change with the change of the ambient light intensity, achieving automatic adjustment of the display module, and meeting the user's requirements for different brightnesses.

[0078] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or replacements, and these modifications or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A brightness adjustment circuit, characterized in that: Applied to an air conditioner, the brightness adjustment circuit includes: A signal acquisition module is used to collect ambient light intensity and generate a light signal according to the ambient light intensity; a control module, connected to the signal acquisition module, and configured to generate a control signal according to the light signal; a signal processing module, connected to the control module, and configured to amplify the control signal to obtain an amplified signal; The power regulation module is connected to the signal processing module and the display module respectively, and is used to generate a driving signal according to the amplified signal and adjust the brightness of the display module through the driving signal.

2. The brightness adjustment circuit according to claim 1, characterized in that: It also includes a feedback module, which is connected to the signal processing module and the power regulation module respectively, and is used to generate a feedback signal according to the current of the display module.

3. The brightness adjustment circuit according to claim 2, characterized in that: The feedback module includes a first resistor, one end of the first resistor is connected to the power supply end, and the other end of the first resistor is connected to the power regulation module.

4. The brightness adjustment circuit according to claim 2, characterized in that: The signal processing module includes a first operational amplifier and a second operational amplifier; The non-inverting input terminal and the inverting input terminal of the first operational amplifier are both connected to the feedback module, and the output terminal of the first operational amplifier is connected to the control module; The non-inverting input terminal of the second operational amplifier is connected to the control module, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected to the power regulation module.

5. The brightness adjustment circuit according to claim 4, characterized in that: The power regulation module includes a first switching tube and a second switching tube; The controlled electrode of the first switching tube is connected to the output end of the second operational amplifier, the first electrode of the first switching tube is connected to the feedback module, the second electrode of the first switching tube is connected to the first electrode of the second switching tube, the controlled electrode of the second switching tube is connected to the control module, and the second electrode of the second switching tube is connected to the display module.

6. The brightness adjustment circuit according to claim 1, characterized in that: The signal acquisition module includes a light sensor, which is connected to the control module and is used to collect ambient light intensity and generate a light signal according to the ambient light intensity.

7. An air conditioner, characterized in that: The device comprises a display module and a brightness adjustment circuit as claimed in any one of claims 1 to 6.

8. A brightness adjustment method, characterized in that: For controlling the air conditioner according to claim 7, the method comprises: detecting a brightness adjustment mode of the air conditioner in real time, wherein the brightness adjustment mode includes a manual adjustment mode and an automatic adjustment mode; If the brightness adjustment mode is the automatic adjustment mode, obtaining the ambient light intensity, and generating a driving signal based on the ambient light intensity; The brightness value of the display module is adjusted by the driving signal.

9. The method according to claim 8, characterized in that The method further comprises: If the brightness adjustment mode is the manual adjustment mode, obtaining a target brightness value, and generating the driving signal based on the target brightness value; Enter the step of adjusting the brightness value of the display module through the driving signal.

10. The method according to claim 9, characterized in that The method further comprises: Determining a target current value based on the ambient light intensity or the target brightness value, and obtaining a sampled current value; If the sampled current value is greater than the target current value, weakening the driving signal so that the sampled current value is the same as the target current value; If the sampled current value is less than the target current value, the driving signal is increased to make the sampled current value the same as the target current value.

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