Power supply module and electronic device

Abstract

The application discloses a power supply module and electronic equipment, and belongs to the technical field of electronic equipment. The power supply module comprises a power supply circuit and a first control circuit. A first signal output end of the power supply circuit is electrically connected with a first pole of a liquid crystal module, and a second signal output end of the power supply circuit is electrically connected with a second pole of the liquid crystal module. The power supply circuit outputs a first frequency voltage signal through the first signal output end and outputs a second frequency voltage signal opposite in phase to the first frequency voltage signal through the second signal output end, so as to supply power to the liquid crystal module. A first input end of the first control circuit is electrically connected with the first pole, a second input end of the first control circuit is electrically connected with the second pole, and a third signal output end of the first control circuit is electrically connected with the power supply circuit. In the case that input voltages of the first input end and the second input end of the first control circuit are equal, the first control circuit outputs a first signal through the third signal output end. The first signal is used for controlling the power supply circuit to stop supplying power to the liquid crystal module.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, specifically relating to a power supply module and electronic equipment. Background Technology

[0002] The unidirectional polarization time of the liquid crystal module must not exceed the predetermined value, otherwise it will affect the haze transmittance of the liquid crystal module, or even damage the liquid crystal module.

[0003] Currently, the power supply module that powers the LCD module continuously supplies power to the LCD module when it is in use. If a single pole of the LCD module is short-circuited to ground at this time, it can easily cause abnormal operation of the LCD module, resulting in low reliability of the LCD module. Summary of the Invention

[0004] The purpose of this application is to provide a power supply module and electronic device that can solve the problem of low reliability of LCD modules.

[0005] In a first aspect, embodiments of this application provide a power supply module for supplying power to a liquid crystal module, comprising: a power supply circuit and a first control circuit;

[0006] The first signal output terminal of the power supply circuit is electrically connected to the first pole of the liquid crystal module, and the second signal output terminal of the power supply circuit is electrically connected to the second pole of the liquid crystal module. The power supply circuit outputs a first frequency voltage signal through the first signal output terminal and outputs a second frequency voltage signal with a phase opposite to the first frequency voltage signal through the second signal output terminal to supply power to the liquid crystal module.

[0007] The first input terminal of the first control circuit is electrically connected to the first pole, the second input terminal of the first control circuit is electrically connected to the second pole, and the third signal output terminal of the first control circuit is electrically connected to the power supply circuit.

[0008] Wherein, when the input voltages at the first input terminal and the second input terminal are equal, the first control circuit outputs a first signal through the third signal output terminal; the first signal is used to control the power supply circuit to stop supplying power to the liquid crystal module.

[0009] Secondly, embodiments of this application provide an electronic device, which includes a power supply module and a liquid crystal module as described in the first aspect.

[0010] The power supply module for powering a liquid crystal module according to embodiments of this application includes a power supply circuit and a first control circuit. The power supply circuit outputs a first frequency voltage signal to the first pole of the liquid crystal module through a first signal output terminal, and outputs a second frequency voltage signal with an opposite phase to the first frequency voltage signal to the second pole of the liquid crystal module through a second signal output terminal, thereby powering the liquid crystal module. The first input terminal of the first control circuit is electrically connected to the first pole, the second input terminal of the first control circuit is electrically connected to the second pole, and the third signal output terminal of the first control circuit is electrically connected to the power supply circuit. It can be understood that, since the first and second frequency voltage signals are out of phase, and the two input terminals of the first control circuit are electrically connected to the two poles of the liquid crystal module, if there is no single-pole short circuit to ground in the liquid crystal module, the two voltage levels of the liquid crystal module will continuously flip, and the input voltages of the two input terminals of the first control circuit will not be equal; if a single-pole short circuit to ground occurs in the liquid crystal module, the input voltages of the two input terminals of the first control circuit will be equal at certain times. Based on this, whether a single-pole short circuit to ground occurs in the liquid crystal module can be determined by monitoring whether the input voltages of the two input terminals of the first control circuit are equal. In this embodiment, when the input voltages of the first input terminal and the second input terminal of the first control circuit are equal, it indicates that a unipolar short circuit to ground has occurred in the liquid crystal module. The first control circuit outputs a first signal through the third signal output terminal to control the power supply circuit to stop supplying power to the liquid crystal module, which can cause the liquid crystal module to stop working, thereby preventing the liquid crystal module from exceeding a predetermined value in unidirectional polarization time, and thus improving the reliability of the liquid crystal module. Attached Figure Description

[0011] Figure 1a This is one of the schematic diagrams illustrating the relationship between the liquid crystal module and the field of view (FOV) provided in the embodiments of this application;

[0012] Figure 1b This is the second schematic diagram illustrating the relationship between the liquid crystal module and the field of view (FOV) provided in the embodiments of this application;

[0013] Figure 2a This is one of the schematic diagrams of the operation of the liquid crystal module provided in the embodiments of this application;

[0014] Figure 2b This is a second schematic diagram of the operation of the liquid crystal module provided in the embodiments of this application;

[0015] Figure 3 This is a schematic diagram of the FOV provided in the embodiments of this application;

[0016] Figure 4a This is one of the schematic diagrams of the frequency signal provided in the embodiments of this application;

[0017] Figure 4b This is a second schematic diagram of the frequency signal provided in the embodiments of this application;

[0018] Figure 4c This is the third schematic diagram of the frequency signal provided in the embodiments of this application;

[0019] Figure 4d This is the fourth schematic diagram of the frequency signal provided in the embodiments of this application;

[0020] Figure 5 This is one of the structural diagrams of the power supply module provided in the embodiments of this application;

[0021] Figure 6a This is the second structural diagram of the power supply module provided in the embodiments of this application;

[0022] Figure 6b This is the third structural diagram of the power supply module provided in the embodiments of this application;

[0023] Figure 7a This is the fourth structural diagram of the power supply module provided in the embodiments of this application;

[0024] Figure 7b This is the fifth structural diagram of the power supply module provided in the embodiments of this application;

[0025] Figure 8 This is the sixth structural diagram of the power supply module provided in the embodiments of this application;

[0026] Figure 9 This is the seventh structural diagram of the power supply module provided in the embodiments of this application;

[0027] Figure 10 This is the eighth structural diagram of the power supply module provided in the embodiments of this application;

[0028] Figure 11a This is the seventh structural diagram of the power supply module provided in the embodiments of this application;

[0029] Figure 11b This is the eighth structural diagram of the power supply module provided in the embodiments of this application;

[0030] Figure 12 This is a structural diagram of the electronic device provided in the embodiments of this application;

[0031] Figure 13a This is one of the schematic diagrams of the DC voltage signal provided in the embodiments of this application;

[0032] Figure 13b This is a second schematic diagram of the DC voltage signal provided in the embodiments of this application;

[0033] Figure 14a This is one of the schematic diagrams of the output signal of the control unit provided in the embodiments of this application;

[0034] Figure 14bThis is a second schematic diagram of the output signal of the control unit provided in the embodiments of this application;

[0035] Figure 15 This is a control flowchart of the power supply module provided in the embodiments of this application. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0037] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] For ease of understanding, the following describes some aspects of the embodiments of this application.

[0039] Portrait lighting effects have become a key area of ​​competition for electronic device manufacturers, and portrait lighting modes have become a major focus for consumers. Currently, the structural design of portrait lighting is as follows: Figure 1a and 1b As shown, an LCD module is placed between the camera lens and the fill light in the electronic device to achieve zoom and brightness adjustment of the fill light. Figure 1a and Figure 1b The difference is: Figure 1a The LCD module is in the power-off (OFF) state. Figure 1b The liquid crystal module is in the powered-on (ON) state. The liquid crystal module can be a polymer-dispersed liquid crystal (PDLC) module, but is not limited to this.

[0040] A liquid crystal module consists of liquid crystals dispersed in micron-sized droplets within a substrate. When the liquid crystal module is not powered on, the optical axes of the microdroplets composed of liquid crystal molecules are freely oriented, and their refractive index does not match that of the substrate. Figure 2a As shown, when light passes through the matrix, it is strongly scattered by the microdroplets, such as Figure 1aAs shown, this can increase the field of view (FOV) of the supplementary light, i.e., increase the equivalent FOV. Since the energy of light emission is constant, an increased FOV results in lower brightness of the illuminated target, but a larger illuminated area. When the liquid crystal module is powered on, the electric field can adjust the optical axis orientation of the liquid crystal droplets. When the refractive index of the droplets matches that of the bulk, such as... Figure 2b As shown, light can pass directly through the substrate, such as... Figure 1b As shown, the original FOV of the fill light is not changed, that is, the equivalent FOV remains unchanged.

[0041] As can be seen, changing the power-on / off state or voltage of the LCD module can alter the field of view (FOV) of the original light source, thereby achieving zoom and brightness adjustment for supplementary lighting. For example... Figure 3 As shown, when the liquid crystal module is powered on, the liquid crystal molecules are polarized and conduction is achieved, and the equivalent field of view (FOV) remains unchanged. Figure 3 In the middle, angle 1; when the liquid crystal module is powered on, the liquid crystal molecules scatter freely, and the equivalent field of view expands, becoming Figure 3 Angle 2 in the middle.

[0042] However, LCD modules have a fatal flaw: the module's brightness cannot maintain a unidirectional voltage difference for an extended period. In other words, the unidirectional polarization time of the LCD module cannot exceed a predetermined value; otherwise, liquid crystal abnormalities will occur, such as a significant decrease in haze and transmittance, or even liquid crystal damage. The normal operating voltage of the LCD module is as follows: Figure 4a As shown, the voltage between the two poles needs to be constantly switched to ensure that unidirectional polarization is not achieved by energizing a single pole for an extended period of time.

[0043] like Figure 1a and 1b As shown, the LCD module is electrically connected to the BTB. During production line assembly and user drop scenarios, there is a risk of short circuit due to incorrect BTB pins. This short circuit can cause a single-pole short circuit to ground in the LCD module. In the event of a single-pole short circuit to ground in the LCD module, the operating voltage of the LCD module will be as follows: Figure 4b Or such as Figure 4c As shown, this leads to unipolar polarization of the liquid crystal module.

[0044] It should be noted that, in Figures 4a to 4c In this context, one electrode of the liquid crystal module is called the positive electrode, and the other is called the negative electrode. However, these positive and negative electrodes are not used to limit the polarity of the driving voltage between the two electrodes of the liquid crystal module. Figure 4a As shown, the driving voltages of both stages are greater than or equal to 0. Additionally, in Figures 4a to 4c In this context, the driving voltage of the LCD module is represented as a square wave signal. However, this does not limit the form in which the driving voltage of the LCD module can be represented. In practical applications, the driving voltage can be represented as a voltage signal of any frequency. In one example, it can be represented as follows: Figure 4dThe frequency voltage signal shown.

[0045] correspond Figure 5 If a short circuit occurs in the BTB pin of the power supply module shown, and the short circuit is not resolved, the liquid crystal module will exhibit abnormal haze transmittance in the short term, and in the long term, the liquid crystal module will malfunction, resulting in reduced reliability.

[0046] exist Figure 5 The power supply module includes:

[0047] Central Processing Unit (CPU): Primarily enables other modules and provides frequency voltage signals, such as a 50Hz pulse width modulation (PWM) square wave signal. In the accompanying drawings of this application embodiment, the frequency voltage signal provided by the CPU is denoted as PWM_In.

[0048] Boost module: Its main function is to boost voltage, because the polarization of the LCD module requires a high voltage, approximately 30V. In this embodiment, the minimum voltage required for LCD module polarization can be referred to as the minimum operating voltage of the LCD module. Only when the operating voltage of the LCD module is greater than this voltage can the LCD module be started and operate normally; otherwise, the LCD module will not be started. EN is the enable terminal of the boost module. The boost module can only operate normally when EN is high (approximately 1.8V). Vin is the input of this module, and VPH is the system power supply.

[0049] The voltage conversion module primarily converts the PWM_In signal into two PWM square wave outputs with a 180° phase difference (i.e., opposite phases). Figure 5 The PWM_N and PWM_P are used in the output. The maximum amplitude of the two PWM square waves is converted into Vin voltage; for example: Figure 5 If PWM_In is a 1.8V / 50Hz PWM square wave and Vin is 30V, then PWM_N and PWM_P are 50Hz / 30V PWM square waves with opposite phase.

[0050] BTB: Assemble the connection between the LCD module and the motherboard.

[0051] LCD module: Changes the field of view (FOV) and energy distribution of light.

[0052] Based on this, the embodiments of this application provide a new power supply module that can stop supplying power to the liquid crystal module when a single-pole short circuit to ground is detected, thereby improving the reliability of the liquid crystal module and extending its service life.

[0053] The power supply module provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0054] like Figure 6a As shown, the power supply module 10 in this embodiment of the application is used to supply power to the liquid crystal module 20. The power supply module 10 may include a power supply circuit 11 and a first control circuit 12.

[0055] In practical implementation, the power supply module 10 can supply power to the liquid crystal module 20 through the power supply circuit 11 to enable the liquid crystal module 20 to operate normally. Additionally, the power supply module 10 can monitor whether a single-pole short circuit to ground occurs in the liquid crystal module 20 through the first control circuit 12, and control the power supply circuit 11 to stop supplying power to the liquid crystal module 20 when a single-pole short circuit to ground occurs, thereby preventing the liquid crystal module from exceeding a predetermined value in unidirectional polarization time, thus improving the reliability of the liquid crystal module.

[0056] To achieve the above functions, in the embodiments of this application, such as Figure 6a As shown, the first signal output terminal 111 of the power supply circuit 11 can be electrically connected to the first pole 21 of the liquid crystal module 20, and the second signal output terminal 112 of the power supply circuit 11 can be electrically connected to the second pole 22 of the liquid crystal module 20.

[0057] When the user expects the LCD module 20 to be turned on, the power supply circuit 11 can output a first frequency voltage signal through the first signal output terminal 111 and output a second frequency voltage signal that is opposite in phase to the first frequency voltage signal through the second signal output terminal 112 to power the LCD module 20, so that the LCD module 20 can work normally under the drive of the first frequency voltage signal and the second frequency voltage signal.

[0058] It should be noted that each cycle of the frequency voltage signal in this embodiment includes at least a first stage and a second stage. The voltage in the first stage is 0, and the voltage in the second stage is greater than or equal to the minimum operating voltage of the liquid crystal module 20. Furthermore, the voltage in the second stage can be constant or fluctuate.

[0059] It is understandable that, based on the aforementioned connection between the power supply circuit 11 and the liquid crystal module 20, if the liquid crystal module 20 does not experience a single-pole short circuit to ground, the voltages at both poles of the liquid crystal module 20 will continuously flip and will not be equal due to the opposite polarities of the first frequency voltage signal and the second frequency voltage signal. If the liquid crystal module 20 experiences a single-pole short circuit to ground, the voltage at the short-circuited pole will always be 0, and the voltages at both poles of the liquid crystal module will become equal. Therefore, by monitoring the voltages at both poles of the liquid crystal module 20, it can be determined whether a single-pole short circuit to ground has occurred.

[0060] In this embodiment, the voltage across the two poles of the liquid crystal module 20 is monitored by the first control circuit 12. Specifically, the first input terminal 121 of the first control circuit 12 is electrically connected to the first pole 21, the second input terminal 122 of the first control circuit 12 is electrically connected to the second pole 22, and the third signal output terminal 123 of the first control circuit 12 is electrically connected to the power supply circuit 11.

[0061] It is understandable that, since the first input terminal 121 is electrically connected to the first pole 21, the input voltage of the first input terminal 121 is the voltage of the first pole 21; similarly, since the second input terminal 122 is electrically connected to the second pole 22, the input voltage of the second input terminal 122 is the voltage of the second pole 22. Based on this, it is possible to determine whether a single pole short circuit to ground occurs in the liquid crystal module 20 by monitoring whether the input voltages of the two input terminals of the first control circuit 12 are equal.

[0062] Specifically, if the input voltages of the first input terminal 121 and the second input terminal 122 of the first control circuit 12 are equal, it can be determined that a single-pole short circuit to ground occurs in the liquid crystal module 20. In order to avoid the unidirectional polarization time of the short-circuited pole from exceeding a predetermined value, the first control circuit 12 can output a first signal through the third signal output terminal 123. The first signal is used to control the power supply circuit 11 to stop supplying power to the liquid crystal module 20.

[0063] After receiving the first signal, the power supply circuit 11 can stop supplying power to the liquid crystal module 20. Specifically, the first signal output terminal 111 of the power supply circuit 11 can stop outputting the first frequency voltage signal, and the second signal output terminal 112 of the power supply circuit 11 can stop outputting the second frequency voltage signal. In this way, the liquid crystal module can be prevented from exceeding the predetermined value in unidirectional polarization time, thereby improving the reliability of the liquid crystal module.

[0064] If the input voltages at the first input terminal 121 and the second input terminal 122 of the first control circuit 12 are not equal, it can be determined that the liquid crystal module 20 has not experienced a single-pole short circuit to ground, and the liquid crystal module 20 can operate normally. In some embodiments, the first control circuit 12 may not interfere with the power supply of the liquid crystal module 20. In other embodiments, when the input voltages at the first input terminal and the second input terminal of the first control circuit 12 are not equal, the first control circuit 12 can output a second signal through the third signal output terminal 123. The second signal is used to control the power supply circuit 11 to continue supplying power to the liquid crystal module 20.

[0065] In practice, the first signal and the second signal can be represented as level signals or as command signals, depending on the actual needs. This application does not limit this.

[0066] The power supply module for powering a liquid crystal module according to embodiments of this application includes a power supply circuit and a first control circuit. The power supply circuit outputs a first frequency voltage signal to the first pole of the liquid crystal module through a first signal output terminal, and outputs a second frequency voltage signal with an opposite phase to the first frequency voltage signal to the second pole of the liquid crystal module through a second signal output terminal, thereby powering the liquid crystal module. The first input terminal of the first control circuit is electrically connected to the first pole, the second input terminal of the first control circuit is electrically connected to the second pole, and the third signal output terminal of the first control circuit is electrically connected to the power supply circuit. It can be understood that, since the first and second frequency voltage signals are out of phase, and the two input terminals of the first control circuit are electrically connected to the two poles of the liquid crystal module, if there is no single-pole short circuit to ground in the liquid crystal module, the two voltage levels of the liquid crystal module will continuously flip, and the input voltages of the two input terminals of the first control circuit will not be equal; if a single-pole short circuit to ground occurs in the liquid crystal module, the input voltages of the two input terminals of the first control circuit will be equal at certain times. Based on this, whether a single-pole short circuit to ground occurs in the liquid crystal module can be determined by monitoring whether the input voltages of the two input terminals of the first control circuit are equal. In this embodiment, when the input voltages of the first input terminal and the second input terminal of the first control circuit are equal, it indicates that a unipolar short circuit to ground has occurred in the liquid crystal module. The first control circuit outputs a first signal through the third signal output terminal to control the power supply circuit to stop supplying power to the liquid crystal module, which can cause the liquid crystal module to stop working, thereby preventing the liquid crystal module from exceeding a predetermined value in unidirectional polarization time, and thus improving the reliability of the liquid crystal module.

[0067] In some embodiments, the power supply module 10 may be disposed on the motherboard, and the liquid crystal module 20 may be disposed on the flexible printed circuit (FPC) 20, but is not limited thereto.

[0068] The embodiments of this application do not limit the electrical connection method between the power supply circuit 11 and the liquid crystal module 20.

[0069] In some embodiments, such as Figure 6a As shown, the power supply circuit 11 can be directly electrically connected to the LCD module 20.

[0070] In other embodiments, such as Figure 6b As shown, the power supply circuit 11 is electrically connected to the liquid crystal module 20 via a connector assembly (BTB) 30. In these embodiments, it can be understood that since the liquid crystal module 20 is electrically connected to the power supply circuit 11 via the connector assembly 30, a short circuit in the connector assembly 30 due to a misconnection of a pin can cause a single-pole short circuit to ground in the liquid crystal module 20.

[0071] Based on this, in these embodiments, the first control circuit 12 can determine whether a pin mis-circuit has occurred in the connector assembly 30 by determining whether the input voltages at its two input terminals are equal. Specifically, if the input voltages at the two input terminals are not equal, it can be determined that a pin mis-circuit has not occurred in the connector assembly 30. If the input voltages at the two input terminals are equal, it can be determined that a pin mis-circuit has occurred in the connector assembly 30.

[0072] In these embodiments, since a connector assembly 30 is introduced between the power supply circuit 11 and the liquid crystal module 20, the connection position of the input terminal of the first control circuit 12 can be flexibly set.

[0073] Optionally, the first input terminal 121 of the first control circuit 12 can be electrically connected to the third connection point 31, and the second input terminal 122 of the first control circuit 12 can be electrically connected to the fourth connection point 32.

[0074] The third connection point 31 is located between the power supply circuit 11 and the connector assembly 30, or the third connection point 31 is located between the connector assembly 30 and the liquid crystal module 20.

[0075] The fourth connection point 32 is located between the power supply circuit 11 and the connector assembly 30, or the fourth connection point 32 is located between the connector assembly 30 and the liquid crystal module 20.

[0076] In specific implementations, such as Figure 6b As shown, the connection points of the two input terminals of the first control circuit 12 can both be located between the power supply circuit 11 and the connector assembly 30. In this embodiment, the two input terminals of the first control circuit 12 detect the voltage across the two poles of the liquid crystal module 20 through the connector assembly 30. Therefore, it can detect not only mis-pin short circuits after the connector assembly 30 is engaged, but also mis-pin short circuits before the connector assembly 30 is engaged, thus broadening the detection range of mis-pin short circuits.

[0077] In other embodiments, the connection points of both input terminals of the first control circuit 12 can be located between the connector assembly 30 and the liquid crystal module 20. In this embodiment, the two input terminals of the first control circuit 12 are directly connected to the two poles of the liquid crystal module 20, thus, a short circuit in a misaligned pin after the connector assembly 30 is engaged can be detected.

[0078] In some other embodiments, one input of the first control circuit 12 may be connected between the power supply circuit 11 and the connector assembly 30, while the other input may be connected between the connector assembly 30 and the liquid crystal module 20. In this embodiment, since one input of the first control circuit 12 is directly connected to the terminal of the liquid crystal module 20, a short circuit due to misalignment of the connector assembly 30 after it is engaged can be detected.

[0079] In an embodiment where the power supply circuit 11 is electrically connected to the liquid crystal module 20 via the connector assembly 30, the first control circuit 12 can determine whether the connector assembly 30 is short-circuited by checking whether the input voltages at its two input terminals are equal. If the connector assembly 30 is short-circuited by checking whether the input voltages at its two input terminals are equal, the first control circuit 12 can output a first signal through the third signal output terminal 123 to control the power supply circuit 11 to stop supplying power to the liquid crystal module, thereby improving the reliability of the liquid crystal module.

[0080] The embodiments of this application do not limit the specific structure of the power supply circuit 11. The structure of the power supply circuit 11 is illustrated below.

[0081] In some embodiments, such as Figure 7a As shown, the power supply circuit 11 may include a processor 117 and a voltage conversion unit 115.

[0082] The voltage conversion unit 115 includes a signal input terminal (PWM_in), a voltage input terminal (Vin), a first signal output terminal (Output_P), and a second signal output terminal (Output_N).

[0083] The signal input terminal of the voltage conversion unit 115 is electrically connected to the processor 117, so that the processor 117 can provide a frequency signal to the voltage conversion unit 115. This application does not limit the method of obtaining the frequency signal. In some embodiments, the frequency signal can be obtained by pulse width modulation, i.e., the frequency signal is a PWM signal, but it is not limited to this.

[0084] The embodiments of this application do not limit the power supply method of the voltage conversion unit 115, that is, they do not limit the connection method of the voltage input terminal of the voltage conversion unit 115.

[0085] In some embodiments, the voltage input terminal of the voltage conversion unit 115 may be electrically connected to a power supply. In this embodiment, the voltage of the voltage conversion unit 115 is provided by the power supply.

[0086] In other embodiments, such as Figure 7a As shown, the voltage input terminal of the voltage conversion unit 115 can be electrically connected to the processor 117, so that the voltage of the voltage conversion unit 115 is provided by the processor 117.

[0087] It is worth noting that in this embodiment, the voltage input terminal of the voltage conversion unit 115 and the processor 117 can be directly connected or indirectly connected through other components. The specific connection can be determined according to the actual situation, and this application embodiment does not limit this.

[0088] In some implementations, such as Figure 7b As shown, the voltage input terminal of the voltage conversion unit 115 can be electrically connected to the processor 117 via the boost unit 116. Figure 7b In the power supply circuit 11, there are a processor 117, a voltage conversion unit 115 and a boost unit 116.

[0089] The boost unit 116 includes an enable terminal (EN), a voltage input terminal (Vin), and a voltage output terminal (Vout). The enable terminal of the boost unit 116 is electrically connected to the processor 117, the voltage input terminal of the boost unit 116 is electrically connected to a third power supply, and the voltage output terminal of the boost unit 116 is electrically connected to the voltage input terminal of the voltage conversion unit 115. The boost unit 116 is used to boost the voltage provided by the processor 117 and then transmit it to the voltage input terminal of the voltage conversion unit 115, thereby reducing the voltage requirements of the processor 117.

[0090] The voltage conversion unit 115 can be used to: convert the frequency signal input to the signal input terminal of the voltage conversion unit 115 into a first frequency voltage signal and a second frequency voltage signal using the voltage input to the voltage input terminal of the voltage conversion unit 115, and output the first frequency voltage signal through the first signal output terminal of the voltage conversion unit 115, and output the second frequency voltage signal through the second signal output terminal of the voltage conversion unit 115.

[0091] It should be noted that, for Figure 7a and Figure 7b The power supply circuit 11 shown has a first signal output terminal 111 of the voltage conversion unit 115, and a second signal output terminal 112 of the voltage conversion unit 115.

[0092] For the power supply circuit 11, which includes processor 117, voltage conversion unit 115 and boost unit 116, power supply to the liquid crystal module 20 can be stopped by performing at least one of the following operations: controlling the power supply to the voltage input terminal of voltage conversion unit 115 to stop supplying voltage to it; and / or disconnecting the connection between the voltage input terminal of voltage conversion unit 115 and its power supply.

[0093] for Figure 7a and Figure 7bThe power supply circuit 11 shown has its third signal output terminal 123 electrically connected to the processor 117. When the input voltages at the first input terminal 121 and the second input terminal 122 are equal, the first control circuit 12 outputs a first signal through the third signal output terminal 123 to control the power supply circuit 11 to stop supplying power to the liquid crystal module 20. In response to the first signal, the power supply circuit 11 can stop supplying power to the liquid crystal module 20 by performing at least one of the following operations:

[0094] The control processor 117 stops supplying voltage to the voltage input terminal of the voltage conversion unit 115;

[0095] Disconnect the connection between the processor 117 and the voltage input terminal of the voltage conversion unit 115;

[0096] The control processor 117 stops providing frequency signals to the signal input terminal of the voltage conversion unit 115;

[0097] Disconnect the signal input terminals of processor 117 and voltage conversion unit 115.

[0098] In some embodiments, the power supply circuit 11 may include a signal processing circuit 113; the signal processing circuit 113 is electrically connected to the third signal output terminal 123 of the first control circuit 12; when the signal processing circuit 113 receives the first signal, it controls the power supply circuit 11 to stop supplying power to the liquid crystal module 20.

[0099] Furthermore, the signal processing circuit 113 can control the power supply circuit 11 to supply power to the liquid crystal module 20 when it receives the second signal or when the activation conditions of the liquid crystal module 20 are met. The activation conditions may include: the user expects to activate the liquid crystal module; or no signal is received from the third signal output terminal 123 of the first control circuit 12.

[0100] For easier understanding, please refer to Figure 8 .exist Figure 8 In the power supply circuit 11, there are processor 117, voltage conversion unit 115, boost unit 116 and signal processing circuit 113, and the signal processing circuit 113 is disposed in processor 117, but this does not limit the structure of power supply circuit 11.

[0101] In this embodiment, the signal processing circuit 113 can control whether the power supply circuit 11 supplies power to the liquid crystal module 20 by determining whether it receives a signal from the first control circuit 12 and the type of the received signal.

[0102] Specifically, if the first signal is received, it can be determined that a single-pole short circuit to ground has occurred in the liquid crystal module 20. The signal processing circuit 113 can respond to the first signal and control the power supply circuit 11 to stop supplying power to the liquid crystal module 20. In this way, the liquid crystal module 20 can stop working when a single-pole short circuit to ground occurs, thereby preventing the liquid crystal module from exceeding a predetermined value in unidirectional polarization time and improving the reliability of the liquid crystal module.

[0103] If the second signal is received, it can be determined that there is no single-pole short circuit to ground in the liquid crystal module 20. The signal processing circuit 113 can respond to the second signal and control the power supply circuit 11 to supply power to the liquid crystal module 20. In this way, the liquid crystal module 20 can operate normally when there is no single-pole short circuit to ground, thereby improving the reliability of the liquid crystal module.

[0104] If no signal is received, it can be determined that the LCD module 20 is not yet working, and the two terminals of the LCD module 20 are in a high-impedance state. At this time, if the user wants to turn on the LCD module, the signal processing circuit 113 can control the power supply circuit 11 to supply power to the LCD module 20. In this way, the power supply circuit 11 can automatically start the LCD module to work, thereby improving the working reliability of the LCD module.

[0105] In this embodiment, by setting a signal processing circuit in the processor, it is possible to prevent the liquid crystal module from exceeding a predetermined value in unidirectional polarization time, and also to enable the liquid crystal module to start autonomously, thereby improving the working reliability of the liquid crystal module.

[0106] The embodiments of this application do not limit the specific structure of the signal processing circuit 113. In some implementations, such as Figure 8 As shown, the signal processing circuit 113 may include a first resistor (R1) 1131, a second resistor (R2) 1132 and a third resistor (R3) 1133 connected in series, wherein the first resistor 1131 is electrically connected to the first power supply (V0) and the third resistor 1133 is grounded.

[0107] The first connection point 1134 of the signal processing circuit 113 is electrically connected to the output terminal of the first control circuit 12; the first connection point 1134 is located between the second resistor 1132 and the third resistor 1133.

[0108] The signal processing circuit 113 can control the power supply circuit 11 to stop supplying power to the liquid crystal module 20 when the second connection point 1135 is at a low level; the second connection point 1135 is located between the first resistor 1131 and the second resistor 1132, and the second connection point 1135 is at a low level when the first connection point 1134 receives the first signal.

[0109] Furthermore, the signal processing circuit 113 can control the power supply circuit 11 to supply power to the liquid crystal module 20 when the second connection point 1135 is at a high level; the second connection point 1135 is at a low level when the second signal is received at the first connection point 1134, or when the conditions for turning on the liquid crystal module 20 are met.

[0110] In this implementation, for the high configuration case, the first connection point 1134 has no input, which is equivalent to the first connection point 1134 being disconnected from the first control circuit 12, and the voltage at the second connection point 1135 is V0×(R2+R3) / (R1+R2+R3).

[0111] If no single-pole short circuit to ground occurs in the LCD module 20, the input voltage at the first connection point 1134 is V1, and the voltage at the second connection point 1135 is V1×(R2+R3) / R3.

[0112] When a single-pole short circuit to ground occurs in the LCD module 20, the input level at the first connection point 1134 is approximately equal to 0, and the voltage at the second connection point 1135 is V0×R2 / (R2+R3).

[0113] By selecting appropriate resistor ranges, such as choosing resistors R1 and R2 with lower ranges and R3 with higher ranges, the following can be achieved:

[0114] In high configuration and when no single-pole short circuit to ground occurs in the LCD module 20, the voltage at the second connection point 1135 is approximately V0, meaning the second connection point 1135 is at a high level. When a single-pole short circuit to ground occurs in the LCD module 20, the voltage at the second connection point 1135 is approximately 0, meaning the second connection point 1135 is at a low level.

[0115] exist Figure 8 In this circuit, the signal processing circuit 113 is composed of resistors, which has a simple structure and can reduce the cost of the signal processing circuit.

[0116] In this embodiment, the first control circuit 12 can output a first signal when the input voltages at the two input terminals are equal, and output a second signal when the input voltages at the two input terminals are unequal. This embodiment does not limit the specific structure of the first control circuit 12; any first control circuit capable of implementing this function falls within the protection scope of this application.

[0117] In some embodiments, such as Figure 9 As shown, the first control circuit 12 can be an XOR gate, which is simple in structure and can reduce the cost of the first control circuit 12.

[0118] The XOR gate works as follows: when the two input signals are different, the output is high; when the two input signals are the same, the output is low, as shown in the table below. In this case, the first signal is low and the second signal is high.

[0119] First input terminal Second input terminal Output Working status of LCD module low level low level low level Abnormal operation low level high level high level Normal work high level low level high level Normal work high level high level low level Abnormal operation

[0120] In some embodiments, the power supply circuit 11 may include a switch assembly 114; the control terminal of the switch assembly 114 is electrically connected to the third signal output terminal 123 of the first control circuit 12.

[0121] The switch assembly 114 disconnects when the control terminal receives the first signal; the power supply circuit 11 stops supplying power to the power supply module 10 when the switch assembly 114 is disconnected.

[0122] For easier understanding, please refer to Figure 10 .exist Figure 10 In the power supply circuit 11, there are processor 117, voltage conversion unit 115, boost unit 116 and switching component 114. The switching component 114 is disposed between the voltage input terminal of voltage conversion unit 115 and processor 117, but this does not limit the structure of power supply circuit 11.

[0123] In this embodiment, the power supply circuit 11 is provided with a switch assembly 114. Therefore, the power supply state of the liquid crystal module 20 can be controlled by controlling the working state of the switch assembly 114, thereby controlling the working state of the liquid crystal module 20.

[0124] The operating state of the switch assembly 114 is controlled by the first control circuit 12. Specifically, the first control circuit 12 can be used to:

[0125] When the input voltages at the first input terminal 121 and the second input terminal 122 are equal, the control switch assembly 114 is disconnected;

[0126] When the input voltages at the first input terminal 121 and the second input terminal 122 are not equal, the control switch assembly 114 is turned on.

[0127] In other words, the first control circuit 12 can control the switch assembly 114 to disconnect when it is determined that a single-pole short circuit to ground occurs in the liquid crystal module 20, thereby controlling the liquid crystal module 20 to stop working by power-off; or it can control the switch assembly 114 to conduct when it is determined that a single-pole short circuit to ground does not occur in the liquid crystal module 20, thereby controlling the liquid crystal module 20 to be powered on and work normally.

[0128] In this embodiment, the working state of the LCD module 20 can be controlled by controlling the working state of the switch assembly 114. The control logic is simple and can be directly implemented in hardware, which can reduce the control cost of the power supply circuit.

[0129] In some embodiments, such as Figure 11a and Figure 11b As shown, the first control circuit 12 may include a first rectifier unit 124, a second rectifier unit 125, and a control unit 126;

[0130] The first input terminal of the control unit 126 is electrically connected to the first pole 21 through the first rectifier unit 124; the second input terminal of the control unit 126 is electrically connected to the second pole 22 through the second rectifier unit 125; and the output terminal of the control unit 126 is electrically connected to the control terminal of the switching assembly 114.

[0131] When the output voltages of the first rectifier unit 124 and the second rectifier unit 125 are not equal, the control unit 126 outputs a first signal.

[0132] Furthermore, when the output voltages of the first rectifier unit 124 and the second rectifier unit 125 are equal, the control unit 126 outputs a second signal.

[0133] The rectifier unit can also be called the detector unit. The first rectifier unit 124 is used to convert the first frequency voltage signal of the first electrode 21 of the input liquid crystal module 20 into a first DC voltage signal, and the second rectifier unit 125 is used to convert the second frequency voltage signal of the second electrode 22 of the input liquid crystal module 20 into a second DC voltage signal.

[0134] In the absence of a single-pole short circuit to ground in the LCD module 20, the first frequency voltage signal and the second frequency voltage signal are as follows: Figure 4a As shown, the first DC voltage signal and the second DC voltage signal can be as follows: Figure 13a As shown, the DC voltage signals of the first electrode 21 and the second electrode 22 of the liquid crystal module 20 are both at a high level, and the signals of the two electrodes are equal.

[0135] In the event of a single-pole short circuit to ground in the LCD module 20, either the first pole 21 or the second pole 22 of the LCD module 20 will be grounded, and the first frequency voltage signal and the second frequency voltage signal will be as follows: Figure 4b or Figure 4c As shown, the first DC voltage signal and the second DC voltage signal can be as follows: Figure 13b As shown, in the LCD module 20, the DC voltage signal of the grounded pole is 0, and the DC voltage signal of the ungrounded pole is high. The signals of the two poles are different.

[0136] The output terminal of the control unit 126 is electrically connected to the control terminal of the switching assembly 114. The control unit 126 can be used for:

[0137] When the output voltages of the first rectifier unit 124 and the second rectifier unit 125 are not equal, the control switch assembly 114 is disconnected;

[0138] When the output voltages of the first rectifier unit 124 and the second rectifier unit 125 are equal, the control switch assembly 114 is turned on.

[0139] As can be seen from the above, when there is no single-pole short circuit to ground in the LCD module 20, the DC voltage signals of the two poles of the LCD module 20 are equal, and the output voltages of the first rectifier unit 124 and the second rectifier unit 125 are equal. Under these circumstances, the control unit 126 controls the switching assembly 114 to conduct, thereby controlling the LCD module 20 to operate normally with normal power supply.

[0140] When a single pole of the LCD module 20 experiences a short circuit to ground, the DC voltage signals at both poles of the LCD module 20 become equal, and the output voltages of the first rectifier unit 124 and the second rectifier unit 125 become equal. In this situation, the control unit 126 controls the switching assembly 114 to open, thereby controlling the LCD module 20 to power off and stop working.

[0141] In this way, the LCD module 20 can stop working in the event of a single-pole short circuit to ground, and it can also work normally in the event of no single-pole short circuit to ground, thereby improving the reliability of the LCD module.

[0142] The embodiments of this application do not limit the specific form of the switching component 114. The switching component 114 can be any electronic switching element, such as a MOSFET or a transistor. Different forms of switching components 114 have different control logics. Therefore, it can be understood that the structure of the control unit 126 can be determined based on the switching component 114.

[0143] In some implementations, when the switching component 114 is an NMOS transistor, the control unit 126 is an AND gate. The AND gate outputs a high level when both input signals are high, such as... Figure 14a As shown, the NMOS transistor can be turned on; when one of the input signals at the two input terminals is low, the output is low, as shown. Figure 14b As shown, the NMOS transistor can be controlled to turn off. This allows for precise control of the NMOS transistor's operating state, improving the power supply reliability of the LCD module.

[0144] In another embodiment, when the switching component 114 is a PMOS transistor, the control unit 126 is a NAND gate. The NAND gate outputs a low level when both input signals are high, thus controlling the PMOS transistor to turn on; when one of the input signals is low, it outputs a high level, thus controlling the PMOS transistor to turn off. This allows for precise control of the PMOS transistor's operating state, improving the power supply reliability of the LCD module.

[0145] In some embodiments of the above embodiments, the power supply module 10 may further include a second control circuit 13; the second control circuit 13 is electrically connected to the control terminal of the switch assembly 114;

[0146] When the conditions for turning on the LCD module 20 are met, the second control circuit 13 controls the switch assembly 114 to turn on.

[0147] Since the power supply module 10 is equipped with a switch assembly 114, the on / off state of the switch assembly 114 directly affects the power supply state of the LCD module 20. The operating state of the switch assembly 114 is controlled by the output signal of the first control circuit 12. If the switch assembly 114 does not receive a signal from the first control circuit 12, then the switch assembly 114 will remain in the default off state, which will affect the normal operation of the LCD module 20.

[0148] Based on this, in this embodiment, the power supply module 10 may also be provided with a second control circuit 13, which is used to control the switch assembly 114 to be turned on when the start-up conditions of the liquid crystal module 20 are met. In this way, the situation where the liquid crystal module 20 cannot be started under normal circumstances can be avoided, and the working reliability of the liquid crystal module 20 can be improved.

[0149] In some implementations of the above embodiments, the second control circuit 13 can be a fourth resistor (R4).

[0150] When the switching component 114 is an NMOS transistor, such as Figure 11a As shown, the second end of the fourth resistor can be electrically connected to the second power supply. Thus, when the conditions for turning on the LCD module 20 are met, the switch assembly 114 can be turned on by the pull-up of the fourth resistor.

[0151] exist Figure 11a In this embodiment, the second end of the fourth resistor is connected to the same power supply as the voltage input terminal of the boost unit 116. However, in other implementations, the two can be connected to different power supplies, depending on the actual needs. This application does not limit this.

[0152] When the switching component 114 is a PMOS transistor, such as Figure 11bAs shown, the second terminal of the fourth resistor is grounded. Thus, when the conditions for turning on the LCD module 20 are met, the switch assembly 114 can be turned on by pulling down the fourth resistor.

[0153] This application also provides an electronic device, including a power supply module 10 and a liquid crystal module 20 provided in this application embodiment, which can achieve the same beneficial effects as the power supply module. To avoid repetition, it will not be described again here.

[0154] In some embodiments, the electronic device may further include a fill light 40 and a third control circuit 50; the third control circuit 50 is electrically connected to the fill light 40.

[0155] When the power supply circuit 11 stops supplying power to the LCD module 20, the third control circuit 50 increases the operating current of the fill light 40.

[0156] In some implementations, such as Figure 12 As shown, the third control circuit 50 can be electrically connected to the power supply circuit 11 to determine whether the power supply circuit 11 stops supplying power to the LCD module 20.

[0157] In some other implementations, the third control circuit 50 can be electrically connected to the first control circuit 12, and determine whether the power supply circuit 11 stops supplying power to the liquid crystal module 20 by acquiring the input voltage of the two input terminals of the first control circuit 12.

[0158] In practice, the fill light 40 can be mounted on the motherboard; the third control circuit 50 can be the aforementioned processor 117, but is not limited to it.

[0159] In this embodiment, the liquid crystal module 20 is used to change the field of view (FOV) of the fill light. As described above, when the liquid crystal module 20 is working normally, the effective FOV of the fill light remains unchanged; however, when the liquid crystal module 20 stops working, the effective FOV of the fill light increases. Since the energy of light emission is constant, an increased FOV results in a larger illumination area for the target object, and consequently, a lower brightness of the illuminated target object. Therefore, if the liquid crystal module 20 switches from normal operation to shutdown, the brightness of the illuminated target object will decrease.

[0160] Based on this, in this embodiment, in order to avoid a jump in the brightness of the illuminated target, the third control circuit 50 can increase the working current of the fill light when the liquid crystal module 20 stops working, so as to compensate for the decrease in the brightness of the illuminated target caused by the liquid crystal module 20 stopping working by increasing the light intensity of the fill light. This ensures that the brightness of the illuminated target remains basically consistent before and after the liquid crystal module 20 switches from normal operation to stopping operation, thereby improving the fill light effect of the target.

[0161] In practice, the adjustment value of the working current of the supplementary light can be determined based on the FOV difference, where the FOV difference is the difference between the equivalent FOV of the LCD module 20 when it stops working and the equivalent FOV of the LCD module 20 when it is working normally.

[0162] The adjustment value of the working current of the fill light can be positively correlated with the FOV difference; that is, the larger the FOV difference, the larger the adjustment value of the working current of the fill light, and vice versa.

[0163] In some implementations, a table or formula can be pre-set to correspond to the adjustment value of the working current of the fill light and the difference in FOV. In this way, the adjustment value of the working current of the fill light can be determined by looking up the table or by calculation, and then the working current of the fill light can be increased by the adjustment value.

[0164] In this embodiment, the electronic device can also control the operating current of the fill light based on the working state of the liquid crystal module, so that the brightness of the target object illuminated by the fill light will not change due to the working state of the liquid crystal module, thereby improving the fill light effect of the target object.

[0165] It should be noted that the various optional embodiments described in this application can be combined with each other or implemented individually without conflict, and this application does not limit the implementation of these embodiments.

[0166] To facilitate understanding of the embodiments provided in this application, examples are illustrated below:

[0167] In one example, the power supply module can be as follows: Figure 9 As shown, an XOR gate logic circuit is used to detect whether a single-pole ground short circuit has occurred in the LCD module. Its working principle is as follows:

[0168] 1. The processor outputs a high level, synchronously outputting a frequency signal.

[0169] 2. The first frequency voltage signal and the second frequency voltage signal are output normally, such as... Figure 4a As shown.

[0170] 3. The principle of an XOR gate: When the two input signals are different, the output is high; when the two input signals are the same, the output is low.

[0171] 4. In the initial state, since the LCD module is not yet working, the two poles of the LCD module are in a high-impedance state, and the output of the XOR gate can be pulled up to a high level by the processor.

[0172] 5. When a single stage of the LCD module is short-circuited to ground, there will inevitably be a moment when both poles of the LCD module are at a low level, and at this time the output of the XOR gate will be low.

[0173] 6. When the processor detects that the output of the XOR gate is low, it immediately stops outputting a high level, and the LCD module stops working.

[0174] 7. Simultaneously adjust the current of the fill light to ensure that the brightness of the target object illuminated by the fill light is reduced due to the LCD module being turned off, thereby improving the fill light effect.

[0175] In this example, the control flow of the power supply module can be as follows: Figure 15 As shown, it includes the following steps:

[0176] Step 1501: The processor outputs a high level and synchronously outputs a frequency signal.

[0177] Step 1502: The processor checks whether the output of the XOR gate is low.

[0178] If yes, proceed to step 1503; otherwise, proceed to step 1505.

[0179] Step 1503: The processor stops outputting high-level signals and frequency signals.

[0180] Step 1504: The processor adjusts the fill light current.

[0181] Step 1505: The processor maintains the normal operation of the LCD module.

[0182] In another example, the power supply module can be as follows: Figure 11a As shown.

[0183] In the initial state, since the NMOS transistor is not turned on and the boost unit is not yet working, there is no power input at the back end, so both terminals of the LCD module are in a high-impedance state. In this state, to avoid an infinite loop that would cause the system to malfunction, an external pull-up resistor R4 is added to turn on the NMOS transistor.

[0184] The power supply principle of the power supply circuit in this example is as follows:

[0185] 1. In the initial state, the NMOS transistor is turned on by the external pull-up resistor R4, the processor outputs a high level, and the frequency signal is output synchronously.

[0186] 2. The first frequency voltage signal and the second frequency voltage signal are output normally, such as... Figure 4a As shown.

[0187] 3. After passing through the rectifier unit, the frequency voltage signal is converted into a DC voltage signal, such as... Figure 13a As shown.

[0188] 4. After passing through the AND gate, such as Figure 14a As shown, when the AND gate outputs a high level, the NMOS transistor is turned on, and the LCD module works normally.

[0189] If a single pole of the PDLC short circuit to ground occurs:

[0190] 1. In the initial state, the NMOS transistor is turned on by the external pull-up resistor R4, the processor outputs a high level, and the frequency signal is output synchronously.

[0191] 2. The first frequency voltage signal and the second frequency voltage signal are as follows: Figure 4b or Figure 4c As shown.

[0192] 3. After passing through the rectifier unit, the frequency voltage signal is converted into a DC voltage signal, such as... Figure 13b As shown.

[0193] 4. After passing through the AND gate, such as Figure 14b As shown, when the AND gate outputs a low level, the NMOS transistor is turned off, and the LCD module stops working.

[0194] The embodiments of this application can effectively solve the reliability problem of liquid crystal modules, ensure that no abnormal liquid crystal polarization occurs when a single electrode of the liquid crystal module is short-circuited to ground, and promptly control the liquid crystal module to stop working, thus providing excellent protection for liquid crystal molecules.

[0195] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0196] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0197] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A power supply module for supplying power to a liquid crystal module, characterized in that, include: Power supply circuit and first control circuit; The first signal output terminal of the power supply circuit is electrically connected to the first pole of the liquid crystal module, and the second signal output terminal of the power supply circuit is electrically connected to the second pole of the liquid crystal module. The power supply circuit outputs a first frequency voltage signal through the first signal output terminal and outputs a second frequency voltage signal with a phase opposite to the first frequency voltage signal through the second signal output terminal to supply power to the liquid crystal module. The first input terminal of the first control circuit is electrically connected to the first pole, the second input terminal of the first control circuit is electrically connected to the second pole, and the third signal output terminal of the first control circuit is electrically connected to the power supply circuit. Wherein, when the input voltages at the first input terminal and the second input terminal are equal, the first control circuit outputs a first signal through the third signal output terminal; the first signal is used to control the power supply circuit to stop supplying power to the liquid crystal module.

2. The power supply module according to claim 1, characterized in that, The power supply circuit includes a signal processing circuit; the signal processing circuit is electrically connected to the third signal output terminal of the first control circuit. Upon receiving the first signal, the signal processing circuit controls the power supply circuit to stop supplying power to the liquid crystal module.

3. The power supply module according to claim 2, characterized in that, The signal processing circuit includes a first resistor, a second resistor, and a third resistor connected in series. The first resistor is electrically connected to a first power supply, and the third resistor is grounded. The first connection point of the signal processing circuit is electrically connected to the output terminal of the first control circuit; the first connection point is located between the second resistor and the third resistor. When the second connection point is at a low level, the signal processing circuit controls the power supply circuit to stop supplying power to the liquid crystal module; the second connection point is located between the first resistor and the second resistor, and the second connection point is at a low level when the first connection point receives the first signal.

4. The power supply module according to any one of claims 1 to 3, characterized in that, The first control circuit is an XOR gate.

5. The power supply module according to claim 1, characterized in that, The power supply circuit includes a switching assembly; the control terminal of the switching assembly is electrically connected to the third signal output terminal of the first control circuit. The switching assembly disconnects when the control terminal receives the first signal; the power supply circuit stops supplying power to the power supply module when the switching assembly disconnects.

6. The power supply module according to claim 5, characterized in that, The power supply module further includes a second control circuit; the second control circuit is electrically connected to the control terminal of the switch assembly. The second control circuit controls the switching component to conduct when the conditions for turning on the liquid crystal module are met.

7. The power supply module according to claim 6, characterized in that, The second control circuit includes a fourth resistor; Wherein, if the switching component is an NMOS transistor, the second terminal of the fourth resistor is electrically connected to the second power supply; if the switching component is a PMOS transistor, the second terminal of the fourth resistor is grounded.

8. The power supply module according to any one of claims 5 to 7, characterized in that, The first control circuit includes a first rectifier unit, a second rectifier unit, and a control unit; The first input terminal of the control unit is electrically connected to the first electrode through the first rectifier unit; the second input terminal of the control unit is electrically connected to the second electrode through the second rectifier unit; the output terminal of the control unit is electrically connected to the control terminal of the switching assembly. The control unit outputs the first signal when the output voltages of the first rectifier unit and the second rectifier unit are not equal.

9. The power supply module according to claim 8, characterized in that, When the switching component is an NMOS transistor, the control unit is an AND gate; When the switching component is a PMOS transistor, the control unit is a NAND gate.

10. The power supply module according to claim 1, characterized in that, The power supply circuit is electrically connected to the liquid crystal module via a connector assembly; The first input terminal of the first control circuit is electrically connected to the third connection point, and the second input terminal of the first control circuit is electrically connected to the fourth connection point. Wherein, the third connection point is located between the power supply circuit and the connector assembly, or the third connection point is located between the connector assembly and the liquid crystal module; The fourth connection point is located between the power supply circuit and the connector assembly, or the fourth connection point is located between the connector assembly and the liquid crystal module.

11. An electronic device, characterized in that, It includes the power supply module and the liquid crystal module as described in any one of claims 1 to 10.

12. The electronic device according to claim 11, characterized in that, It also includes a fill light and a third control circuit; the third control circuit is electrically connected to the fill light and the power supply circuit respectively. The third control circuit increases the operating current of the fill light when the power supply circuit stops supplying power to the liquid crystal module.

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