Display device, driving circuit and output control method thereof

Abstract

The application discloses a display device, a driving circuit and an output control method. The driving circuit is connected to a dimming layer. The driving circuit is connected to an ambient light sensor to provide a corresponding driving signal to the dimming layer according to sensing data provided by the ambient light sensor. The driving circuit comprises a control module connected to the ambient light sensor to obtain the sensing data. The control module is used to process the sensing data to obtain brightness value data corresponding to the sensing data, and provide a control signal according to a numerical interval in which the brightness value data is located. A driving module is connected to the control module to receive the control signal. The driving module is used to generate a corresponding driving signal according to the control signal. The driving signal is used to adjust a light scattering state of the dimming layer. The light scattering state comprises a first light scattering state supporting a wide viewing angle mode and a second light scattering state supporting a narrow viewing angle mode. The driving circuit can realize dynamic viewing angle switching under different brightness values, so that the display device can adapt to different lighting conditions.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to display devices, driving circuits, and output control methods thereof. Background Technology

[0002] With the development of technology, people have increasingly higher requirements for privacy protection of LCD display devices, such as... Figure 1 As shown, a liquid crystal display device in the prior art includes: a backlight module 10 for emitting backlight; a liquid crystal display module 20 located on the light-emitting side of the backlight module 10 for controlling image display; and a viewing angle dimming box 30 located on the light-emitting side of the liquid crystal display module 20 for controlling the viewing angle of the image displayed by the liquid crystal display module 20.

[0003] The viewing angle dimming box 30 is mainly used for viewing angle control during image display, enabling both wide-viewing-angle and narrow-viewing-angle display modes. In wide-viewing-angle mode, users can view the display image within a large viewing angle area. This large viewing angle area refers to the area deviating from the direct viewing angle of the LCD module. In other words, in this wide-viewing-angle mode, the display light can be emitted not only at a perpendicular angle to the light-emitting surface of the LCD module but also at a large viewing angle forming a small acute angle with the light-emitting surface of the LCD module. Conversely, in narrow-viewing-angle mode, users can only view the display image within the direct viewing angle area, and cannot see the display image when viewing within the large viewing angle area, thus achieving a privacy protection effect.

[0004] When the backlight module 10 adopts collimated backlight (CBL) mode, the backlight module 10 adopting collimated backlight mode will cause the light incident angle to decrease, the light scattering effect under wide viewing angle display is weakened, and the wide viewing angle effect is not good. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a display device, a driving circuit and an output control method thereof, thereby providing a better wide viewing angle display effect and providing a dynamically switching display viewing angle according to different lighting conditions.

[0006] According to one aspect of the present invention, a driving circuit is provided, wherein the driving circuit is connected to a dimming layer located between a liquid crystal module and a backlight module, and is used to generate a corresponding driving signal based on sensing data provided by an ambient light sensor. The driving circuit includes: a control module connected to the ambient light sensor to obtain the sensing data, the control module being used to process the sensing data to obtain brightness value data corresponding to the sensing data, and to provide a corresponding control signal based on the numerical range of the brightness value data; and a driving module connected to the control module to receive the control signal, the driving module being used to generate a corresponding driving signal based on the control signal, the driving signal being used to adjust the light scattering state of the dimming layer, the light scattering state including at least a first astigmatism state supporting a wide viewing angle mode and a second astigmatism state supporting a narrow viewing angle mode.

[0007] Preferably, the control module includes output terminals corresponding to the number of data intervals. The control module sets the voltage values ​​of multiple output terminals according to the numerical interval where the brightness value data is located, so as to set the corresponding output terminal to a first level and the remaining output terminals to a second level. Each data bit of the control signal is provided by the multiple output terminals of the control module.

[0008] Preferably, the control module is further configured to provide a first square wave signal to the drive module, and the drive module generates a drive signal with the same frequency as the first square wave signal based on the first square wave signal.

[0009] Preferably, the control module includes: a first operational amplifier, wherein the positive power supply terminal of the first operational amplifier receives a first positive power supply voltage, the negative power supply terminal receives a first negative power supply voltage, the positive input terminal receives a first square wave signal, and the output terminal outputs a first positive and negative square wave signal; a multiplexer, wherein the input terminal of the multiplexer is connected to the output terminal of the operational amplifier to receive the first square wave signal, the control terminal receives the control signal, and multiple output terminals are respectively connected to multiple first resistor branches, the multiplexer being used to conduct the input terminal and the corresponding output terminal according to the control signal; a second operational amplifier, wherein the negative input terminal of the second operational amplifier is respectively connected to the multiple first resistor branches, and a corresponding input resistor is connected according to the conduction status of the multiplexer, wherein a feedback resistor is also connected between the output terminal and the negative input terminal of the second operational amplifier, and the second operational amplifier amplifies the first positive and negative square wave signal according to the multiplexing relationship between the input resistor and the feedback resistor to obtain a second positive and negative square wave signal as the driving signal.

[0010] Preferably, the control module further includes multiple second resistor branches, each second resistor branch including a switching transistor, the control terminal of which receives the control signal to connect the second resistor branch to the positive input circuit of the second operational amplifier according to the control signal.

[0011] Preferably, the resistance value of the second resistor branch connected in the positive input circuit of the second operational amplifier is equal to the parallel resistance value of the input resistor and the feedback resistor.

[0012] Preferably, the number of the first resistor branch and the second resistor branch corresponds to the number of output terminals of the control module.

[0013] According to another aspect of the present invention, a display device is provided, comprising: a backlight module for emitting backlight; a liquid crystal display module located on the light-emitting side of the backlight module for displaying images; a viewing angle dimming box located on the light-emitting side of the liquid crystal display module for controlling the wide and narrow viewing angles of the images displayed by the liquid crystal display module; an ambient light sensor for generating sensing data based on external ambient light; a dimming layer located between the backlight module and the liquid crystal display module, comprising at least a first astigmatism state supporting a wide viewing angle mode and a second astigmatism state supporting a narrow viewing angle mode; and a driving circuit as described in any one of the preceding embodiments, the driving circuit being used to provide a driving signal to the dimming layer based on the sensing data to adjust the light scattering state of the dimming layer.

[0014] According to another aspect of the present invention, the method includes: reading sensing data from an ambient light sensor; processing the sensing data to obtain corresponding brightness value data; sequentially determining the relationship between multiple preset thresholds and the brightness value data, determining the numerical range in which the brightness value data is located, and entering a corresponding driving mode to provide a corresponding control signal.

[0015] Preferably, the step of processing the sensing data to obtain the corresponding brightness value data includes: multiplying the sensing data by a correction value to obtain the brightness value data.

[0016] The display device structure provided in this application, by adding a dimming layer, enables the liquid crystal display device to exhibit a light scattering state in the dimming layer in wide viewing angle mode, while still maintaining a good wide viewing angle effect.

[0017] In one embodiment, the driving circuit provided in this application includes a sensor that generates sensing data based on ambient light. A control module provides a corresponding control signal based on the numerical range of the brightness value data, and the driving module generates a corresponding driving signal based on the control signal. This enables dynamic viewing angle switching under different lighting conditions, allowing the display device to adapt to various illumination conditions. Attached Figure Description

[0018] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0019] Figure 1 A schematic diagram of a display device structure according to the prior art is shown;

[0020] Figure 2 A schematic diagram of the display device structure according to a first embodiment of the present invention is shown;

[0021] Figure 3 A schematic diagram of the drive circuit according to a second embodiment of the present invention is shown;

[0022] Figure 4 The diagram shows a waveform of the drive signal provided by the drive circuit according to a second embodiment of the present invention;

[0023] Figure 5 A structural block diagram of a driving circuit according to a second embodiment of the present invention is shown;

[0024] Figure 6 A circuit diagram of a driving circuit according to a third embodiment of the present invention is shown;

[0025] Figure 7 A flowchart of an output control method for a drive circuit according to a fourth embodiment of the present invention is shown. Detailed Implementation

[0026] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements or modules are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0027] It should be understood that, in the following description, "circuit" may include single or combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by the programmable circuit. When an element or circuit is said to be "connected" to another element or "connected" between two nodes, it may be directly coupled or connected to the other element, or there may be intermediate elements; the connection between elements may be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected" to another element, it means that there are no intermediate elements between them.

[0028] Furthermore, certain terms are used in this patent specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This patent specification and claims do not distinguish components based on differences in name, but rather on differences in function.

[0029] Furthermore, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, 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 said element.

[0030] Figure 2 A schematic diagram of the structure of a display device according to a first embodiment of the present invention is shown.

[0031] like Figure 2 As shown, the liquid crystal display device of this application includes: a backlight module 10 for emitting backlight; a liquid crystal display module 20 located on the light-emitting side of the backlight module 10 for controlling image display; and a viewing angle dimming box 30 located on the light-emitting side of the liquid crystal display module 20 for controlling the wide and narrow viewing angles of the image displayed by the liquid crystal display module 20. The viewing angle dimming box 30 is mainly used for viewing angle control during image display, realizing both wide and narrow viewing angle display modes.

[0032] In addition, a dimming layer 40 is also included between the backlight module 10 and the liquid crystal display module 20.

[0033] The dimming layer 40 is, for example, a polymer-dispersed liquid crystal (PDLC). The liquid crystal in the dimming layer 40 is uniformly distributed in the polymer matrix, primarily in the form of microdroplets. Different electric field intensities applied to it alter the regular arrangement of the liquid crystal molecules in the PDLC, resulting in different transmission states. Located between the liquid crystal cell and the backlight panel, the dimming layer 40 can exhibit both light scattering and light transmission states. When the dimming layer 40 exhibits a light scattering state, the liquid crystal display device using it operates in a wide viewing angle mode, allowing a complete and undistorted image to be seen from different directions. When the PDLC exhibits a light transmission state, the liquid crystal display device using the dimming layer 40 operates in a narrow viewing angle mode, allowing a complete and undistorted image to be seen directly in front. The wide and narrow viewing angle modes adapt to different lighting conditions.

[0034] The display device structure provided in this application, by adding a dimming layer 40, enables the liquid crystal display device to exhibit a light scattering state in the dimming layer 40 in the wide viewing angle mode, while still maintaining a good wide viewing angle effect.

[0035] Figure 3 A schematic diagram of the drive circuit according to a second embodiment of the present invention is shown.

[0036] like Figure 3 As shown, the driving circuit provided in this application is electrically connected to the dimming layer and is used to provide a driving signal to the dimming layer according to the sensing data provided by the ambient light sensor 50. The ambient light sensor 50 is disposed in the display device at a position that can receive external ambient light and is used to generate sensing data according to the external ambient light.

[0037] The driving circuit includes: control module 101 and driving module 102.

[0038] The control module 101 is connected to the ambient light sensor 101 to read the sensing data, processes the sensing data to obtain the corresponding brightness value data, and provides the corresponding control signal based on the brightness value data. The control module 101 is, for example, a microcontroller (MCU).

[0039] The driving module 102 is connected to the control module 101 to receive control signals and generate corresponding driving signals according to the control signals to provide to the dimming layer, so as to enable the dimming layer to provide different display effects under different lighting conditions.

[0040] Figure 4 The diagram shows a drive signal waveform provided by the drive circuit according to a second embodiment of the present invention. Figure 5 A structural block diagram of a driving circuit according to a second embodiment of the present invention is shown.

[0041] Combination Figure 4 and Figure 5 The control module 101 divides the obtained brightness value data into multiple numerical ranges. For example, the brightness value of ambient light below 300 lux is one numerical range, the brightness value of 300 lux-5000 lux is another numerical range, the brightness value of 5000 lux-100000 lux is another numerical range, and the brightness value above 100000 lux is yet another numerical range. The control module 101 then provides corresponding control signals according to different numerical ranges.

[0042] The driving module 102 generates a corresponding driving signal according to the control signal. For example, when the ambient light brightness value is below 300 lux, the ambient light is relatively dark. The dimming layer can be adapted to the first wide viewing angle mode with low ambient brightness. The control module 101 controls the driving module 102 to provide a ±2V square wave signal as a driving signal to the dimming layer.

[0043] When the ambient light brightness is between 300 lux and 5000 lux, the ambient light is relatively dark. The dimming layer can be in a second wide-viewing-angle mode with lower brightness. The control module 101 controls the drive module 102 to provide a ±4V square wave signal as a drive signal to the dimming layer.

[0044] When the ambient light brightness value is 5000 lux-100000 lux, the ambient light is normal, and the dimming layer can be in normal viewing mode. The control module 101 controls the drive module 102 to provide a ±10V square wave signal as a drive signal to the dimming layer.

[0045] When the ambient light brightness value is above 100,000 lux, the ambient light is too bright. The dimming layer can adapt to the high brightness mode of the high ambient light. The control module 101 controls the drive module 102 to provide a ±15V square wave signal as a drive signal to the dimming layer.

[0046] The boundary values ​​of the above numerical ranges and the magnitude of the corresponding driving signals can be adjusted according to actual conditions, and this application does not impose any restrictions on them.

[0047] Figure 6 A circuit diagram of the control module and the drive module in the drive circuit according to the third embodiment of the present invention is shown.

[0048] The control module 101 includes multiple output terminals P0 / P1 / P2 / P3 and a digital-to-analog converter (DAC). The multiple output terminals P0 / P1 / P2 / P3 output control signals corresponding to the aforementioned numerical ranges. In one embodiment, when the ambient light brightness is below 300 lux, output terminal P0 outputs 1, and the other output terminals output 0; when the ambient light brightness is between 300 lux and 5000 lux, output terminal P1 outputs 1, and the other output terminals output 0; when the ambient light brightness is between 5000 lux and 100000 lux, output terminal P2 outputs 1, and the other output terminals output 0; when the ambient light brightness is above 100000 lux, output terminal P3 outputs 1, and the other output terminals output 0.

[0049] That is, the control module 101 sets the voltage values ​​of multiple output terminals according to the numerical range of the brightness value data, so as to set the corresponding output terminal to 1 and the other output terminals to 0, or set the corresponding output terminal to 0 and the other output terminals to 1. Each data bit of the control signal is provided by the multiple output terminals of the control module 101.

[0050] The control module 101 generates a square wave signal, such as a 0-3V square wave signal, through its built-in digital-to-analog converter (DAC), and generates a drive signal of the corresponding frequency based on the square wave signal.

[0051] The driving module 102 includes an operational amplifier OP1, a multiplexer M1, and an operational amplifier OP2. The control module 101 provides a square wave signal to the positive input terminal of the operational amplifier OP1. The positive power supply terminal of the operational amplifier OP1 receives a first positive power supply voltage, the negative power supply terminal of the operational amplifier OP1 receives a first negative power supply voltage, and the negative input terminal of the operational amplifier OP1 receives the intermediate voltage of the square wave signal. By configuring the first positive power supply voltage and the second negative power supply voltage, a first positive and negative square wave signal is obtained.

[0052] The output of operational amplifier OP1 is connected to the input of multiplexer M1. The control terminals A0 / A1 / A2 / A3 of the multiplexer are respectively connected to multiple output terminals P0 / P1 / P2 / P3 of control module 101, including a single-pole multi-throw switch, so as to conduct the obtained positive and negative square wave signals to the negative input terminal of operational amplifier OP2 through the corresponding first resistor branch according to the control signal provided by control module 101.

[0053] In one embodiment, the plurality of first resistor branches include resistors R1, R2, R3, and R4 connected in parallel between the output of multiplexer M1 and the negative input of operational amplifier OP2. The number of branches is the same as the number of outputs of control module 101. For example, multiplexer M1 is configured such that when P0 is 1, switch S1 is turned on, and the first positive and negative square wave signals are conducted to the negative input of operational amplifier OP2 via resistor R1. For example, multiplexer M1 is configured such that when P1 is 1, switch S2 is turned on, and the first positive and negative square wave signals are conducted to the negative input of operational amplifier OP2 via resistor R2. For example, multiplexer M1 is configured such that when P2 is 1, switch S3 is turned on, and the first positive and negative square wave signals are conducted to the negative input of operational amplifier OP2 via resistor R3. For example, the multiplexer M1 is configured such that when P3 is 1, switch S4 is turned on, and the first positive and negative square wave signals are conducted to the negative input of operational amplifier OP2 via resistor R4.

[0054] Operational amplifier OP2 receives a second positive power supply voltage at its positive power supply terminal and a second negative power supply voltage at its negative power supply terminal. A resistor R5 is connected between the negative power supply terminal and the output terminal of operational amplifier OP2. Resistor R5 has a predetermined multiple relationship with the input resistances of the aforementioned resistor branches. For example, the resistance of resistor R5 is 10 times that of resistor R1, 20 / 3 times that of resistor R2, 17 / 4 times that of resistor R3, and 4 / 3 times that of resistor R4. Because of the aforementioned operational amplifier... Where Vin is the first positive and negative square wave signal mentioned above, and Rin is the input resistance corresponding to the first positive and negative square wave signal being turned on to the negative input terminal of operational amplifier OP2. The output terminal of operational amplifier OP2 outputs the amplified second positive and negative square wave signal.

[0055] In one embodiment, the positive input terminal of operational amplifier OP2 is connected to multiple second resistor branches, each including resistors R6, R7, R8, and R9. The first terminals of resistors R6, R7, R8, and R9 are connected to the positive input terminal of operational amplifier OP2, and their second terminals are grounded through switching transistors. These switching transistors are, for example, N-type switching transistors. Each switching transistor in the multiple second resistor branches receives a control signal provided by the control module, grounding its respective resistor branch to form a loop.

[0056] In one embodiment, the switching transistor in the branch containing resistor R6 receives control signal P0, the switching transistor in the branch containing resistor R7 receives control signal P1, the switching transistor in the branch containing resistor R8 receives control signal P2, and the switching transistor in the branch containing resistor R9 receives control signal P3. Simultaneously, the resistance value of resistor R6 is the same as the parallel resistance value of resistors R1 and R5 connected to the operational amplifier under the same control signal P0; the resistance value of resistor R7 is the same as the parallel resistance value of resistors R2 and R5 connected to the operational amplifier under the same control signal P1; the resistance value of resistor R8 is the same as the parallel resistance value of resistors R3 and R5 connected to the operational amplifier under the same control signal P3; and the resistance value of resistor R9 is the same as the parallel resistance value of resistors R4 and R5 connected to the operational amplifier under the same control signal P3. This causes the operational amplifier circuit OP2 to enter a deep negative feedback state, improving amplification accuracy.

[0057] The control signals P0 / P1 / P2 / P3 and the conduction status of switches S1 / S2 / S3 / S4 in multiplexer M1, as well as the correspondence between resistors Rin and R connected to the negative and positive input terminals of operational amplifier OP2 and the range of brightness values, are shown in Table 1 below:

[0058]

[0059] Table 1

[0060] In one embodiment, when the above-mentioned multiple brightness values ​​are in different value ranges, the driving signal provided to the viewing angle dimming box is the same, which is a square wave signal of ±5V.

[0061] Figure 7 A flowchart of the output control method of the control module according to the fourth embodiment of the present invention is shown.

[0062] like Figure 7 As shown, the above output control method is implemented by, for example, control module 101, and specifically includes the following steps:

[0063] S1: Read the ambient light sensor's sensor data.

[0064] In step S1, the control module reads the ambient light sensor's sensing data from the ambient light sensor via the I2C bus protocol, for example.

[0065] S2: Multiply the read sensor data by the correction value to obtain the brightness value K.

[0066] In step S2, the control module corrects the read sensing data, for example by multiplying the sensing data by the correction value to obtain the brightness value K.

[0067] S3: Determine whether the brightness value K is greater than the first preset threshold.

[0068] In step S3, the control module determines whether the brightness value K is greater than the first preset threshold. If yes, it executes step S4: enters mode SM1, configures output terminal P0 to output 1, and output terminals P1, P2, and P3 to output 0. If no, it executes step S5.

[0069] S5: Determine whether the brightness value K is greater than the second preset threshold.

[0070] In step S5, the control module determines whether the brightness value K is greater than the second preset threshold. If yes, then step S6 is executed: enter mode SM2, configure output terminal P1 to output 1, and output terminals P0, P2, and P3 to output 0; if no, then step S7 is executed.

[0071] S7: Determine whether the brightness value K is greater than the third preset threshold.

[0072] In step S7, the control module determines whether the brightness value K is greater than the third preset threshold. If yes, then step S8 is executed: enter mode SM3, configure output terminal P2 to output 1, and output terminals P0, P1, and P3 to output 0. If no, then step S9 is executed: enter mode SM3, configure output terminal P3 to output 1, and output terminals P0, P1, and P2 to output 0.

[0073] In one embodiment, the first preset threshold is 100,000 lux, the second preset threshold is 5,000 lux, and the third preset threshold is 300 lux. Different modes are entered based on the brightness value. The method described above judges the boundary values ​​of each brightness value range sequentially from largest to smallest. In other embodiments, the boundary values ​​of each brightness value range can also be judged sequentially from smallest to largest, or the corresponding mode can be entered directly based on which brightness value range the brightness value falls into, controlling the output terminal to output. Furthermore, the above-mentioned correction of the sensed data is not a necessary step; those skilled in the art can make adjustments according to the actual situation.

[0074] It should be noted that those skilled in the art will understand that the terms “during,” “when,” and “when…” used herein in relation to circuit operation are not strict terms indicating an action that occurs immediately upon the commencement of a startup action, but rather that there may be some small but reasonable delays, such as various propagation delays, between the startup action and the reaction action initiated by it. The terms “approximately” or “substantially” used herein mean that an element value is expected to be close to the declared value or position. However, as is well known in the art, there are always small deviations that make it difficult for the value or position to be strictly the declared value. It has been properly determined in the art that a deviation of at least ten percent (10%) (or at least twenty percent (20%) for semiconductor doping concentration) is a reasonable deviation from the described accurate ideal target. When used in conjunction with signal states, the actual voltage value or logic state of the signal (e.g., “1” or “0”) depends on whether positive or negative logic is used.

[0075] As described above, these embodiments of the present invention do not exhaustively describe all details, nor do they limit the invention to specific embodiments. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The scope of protection of this invention should be determined by the scope defined in the claims and their equivalents.

Claims

1. A driving circuit, wherein, The driving circuit is connected to a dimming layer located between the liquid crystal module and the backlight module. The driving circuit is also connected to an ambient light sensor to provide a corresponding driving signal to the dimming layer based on the sensing data provided by the ambient light sensor. The driving circuit includes: A control module, connected to the ambient light sensor, acquires the sensed data. The control module processes the sensed data to obtain brightness value data corresponding to the sensed data, and provides corresponding control signals based on the value range of the brightness value data. A driving module, connected to the control module to receive the control signal, is used to generate a corresponding driving signal based on the control signal. The driving signal is used to adjust the light scattering state of the dimming layer, wherein the light scattering state includes at least a first astigmatism state supporting a wide viewing angle mode and a second astigmatism state supporting a narrow viewing angle mode. The driving module includes: The first operational amplifier has a positive power supply terminal receiving a first positive power supply voltage, a negative power supply terminal receiving a first negative power supply voltage, a positive input terminal receiving a first square wave signal, and an output terminal outputting a first positive and negative square wave signal. A multiplexer, wherein the input terminal of the multiplexer is connected to the output terminal of the operational amplifier to receive the first positive and negative square wave signals, the control terminal receives the control signal, and multiple output terminals are respectively connected to multiple first resistor branches. The multiplexer is used to turn on the input terminal and the corresponding output terminal according to the control signal. The second operational amplifier has its negative input terminal connected to each of the plurality of first resistor branches, and the corresponding input resistor is connected according to the conduction status of the multiplexer. The second operational amplifier is connected to a feedback resistor between its output terminal and the negative input terminal. The second operational amplifier amplifies the first positive and negative square wave signal according to the ratio between the input resistor and the feedback resistor to obtain a second positive and negative square wave signal, which is then used as the driving signal.

2. The driving circuit according to claim 1, wherein, The control module includes output terminals corresponding to the number of data intervals. The control module sets the voltage values ​​of multiple output terminals according to the numerical interval where the brightness value data is located, so as to set the corresponding output terminal to a first level and the remaining output terminals to a second level. Each data bit of the control signal is provided by the multiple output terminals of the control module.

3. The driving circuit according to claim 2, wherein, The control module is further configured to provide the first square wave signal to the drive module, and the drive module generates a drive signal with the same frequency as the first square wave signal based on the first square wave signal.

4. The driving circuit according to claim 1, wherein, The driving module further includes multiple second resistor branches, each of which includes a switching transistor. The control terminal of the switching transistor receives the control signal to connect the second resistor branch to the positive input circuit of the second operational amplifier according to the control signal.

5. The driving circuit according to claim 4, wherein, The resistance value of the second resistor branch in the positive input circuit of the second operational amplifier is equal to the parallel resistance value of the input resistor and the feedback resistor.

6. The driving circuit according to claim 5, wherein, The number of the first resistor branch and the second resistor branch corresponds to the number of output terminals of the control module.

7. A display device, comprising: Backlight module, used for emitting backlight; A liquid crystal display module, located on the light-emitting side of the backlight module, is used for image display; A viewing angle dimming box, located on the light-emitting side of the liquid crystal display module, is used to control the viewing angle of the image displayed by the liquid crystal display module. An ambient light sensor is used to generate sensing data based on external ambient light. The dimming layer, located between the backlight module and the liquid crystal display module, includes at least a first astigmatism state supporting a wide viewing angle mode and a second astigmatism state supporting a narrow viewing angle mode. And the driving circuit according to any one of claims 1-6, the driving circuit being used to provide a driving signal to the dimming layer according to the sensing data, so as to adjust the light scattering state of the dimming layer.

8. An output control method for a drive circuit, wherein, The control method is used to control the drive circuit as described in any one of claims 1-6, the control method comprising: Read the sensor data from the ambient light sensor; The sensor data is processed to obtain the corresponding brightness value data; The system sequentially determines the relationship between multiple preset thresholds and the brightness value data, identifies the numerical range of the brightness value data, and enters the corresponding driving mode to provide the corresponding control signal.

9. The output control method according to claim 8, wherein, The process of processing the sensed data to obtain the corresponding brightness value data includes: multiplying the sensed data by a correction value to obtain the brightness value data.

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