Driving circuit, driving method, and display device

Abstract

The application discloses a driving circuit, a driving method and a display device, and relates to the technical field of display. The driving circuit comprises a control module and an analog module. The control module outputs corresponding control signals to the analog module according to a display mode selected by a user. The analog module receives the control signals and outputs corresponding driving analog signals to a viewing angle control box of a display module. When the control module outputs a first control signal, the analog module calls a first driving analog signal corresponding to a privacy mode for output. When the control module outputs a second control signal, the analog module calls a second driving analog signal corresponding to a normal display mode for output. The driving circuit of the application uses the analog module and the control module to output the driving analog signals, so that a digital-analog conversion module need not be arranged in the circuit, the occupied space required by the driving circuit is reduced, and electrical components are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a driving circuit, a driving method and a display device. BACKGROUND

[0002] With the continuous progress of liquid crystal display technology, the visual angle of display has been widened from the original 112° to more than 122°. People enjoy the visual experience brought by large visual angle, and also hope to effectively protect commercial secrets and personal privacy to avoid business losses or embarrassment caused by screen information leakage. Therefore, in addition to the demand for wide visual angle, display devices also need to have the function of switching between wide and narrow visual angles in many occasions.

[0003] However, the current anti-peeping technology has many components in the circuit design, which occupies a large space on the printed circuit board, resulting in high anti-peeping cost of notebook computers. SUMMARY

[0004] The purpose of the present application is to provide a driving circuit, a driving method and a display device, which uses an analog module and a control module to output a driving analog signal, without setting a digital-to-analog conversion module in the circuit, thereby reducing the occupied space required by the driving circuit and saving electrical components.

[0005] The present application discloses a driving circuit for driving a display module, the display module comprising a display panel and a viewing angle control box attached to the display panel, the driving circuit comprising a control module and an analog module, the control module being connected to the analog module, the control module outputting a corresponding control signal to the analog module according to a display mode selected by a user, the analog module receiving the control signal and outputting a corresponding driving analog signal to the viewing angle control box of the display module according to the control signal; wherein the control signal comprises a first control signal and a second control signal, when the control module outputs the first control signal to the analog module, the analog module calls a first driving analog signal corresponding to an anti-peeping mode and outputs it to the viewing angle control box of the display module to realize an anti-peeping display function; when the control module outputs the second control signal to the analog module, the analog module calls a second driving analog signal corresponding to a normal display mode and outputs it to the viewing angle control box of the display module to realize a normal display function.

[0006] Optionally, the simulation module comprises an input level conversion module, a first proportional amplification module, a second proportional amplification module, a following output module and a differential subtraction module, the input level conversion module converts the control signal into a first voltage value and provides the first proportional amplification module and the second proportional amplification module, the first proportional amplification module and the second proportional amplification module amplify the first voltage value to obtain a second voltage value, the following output module converts the second voltage value obtained by the second proportional amplification module into a third voltage value, and the differential subtraction module proportionally scales the second voltage value obtained by the first proportional amplification module and the third voltage value obtained by the following output module to obtain a first driving analog signal corresponding to the first control signal or a second driving analog signal corresponding to the second control signal; wherein the first driving analog signal and the second driving analog signal each comprise a set of positive and negative symmetric voltage signals.

[0007] Optionally, the input level conversion module comprises a first transistor, a second transistor and a first power input end, the first power input end is connected with the source of the first transistor and the second transistor, the control module is connected with the gate of the first transistor and the second transistor, so as to control the conduction and the turn-off of the first transistor and the second transistor according to the first control signal and the second control signal output by the control module, and the drain of the first transistor and the second transistor is connected with the ground end; the first proportional amplification module comprises a first amplifier, a third transistor and a first resistor, the control module is connected with the gate of the third transistor, the first input end of the first amplifier is connected between the first power input end and the source of the first transistor, the second input end of the first amplifier is connected with the drain of the third transistor, the first output end of the first amplifier is connected with the second input end of the first amplifier through the first resistor, and the source of the third transistor is connected with the ground end; the second proportional amplification module comprises a second amplifier, a fourth transistor and a second resistor, the control module is connected with the gate of the fourth transistor, the first input end of the second amplifier is connected between the first power input end and the source of the second transistor, the second input end of the second amplifier is connected with the drain of the fourth transistor, the first output end of the second amplifier is connected with the second input end of the second amplifier through the second resistor, and the source of the fourth transistor is connected with the ground end; the following output module comprises a third amplifier and a third resistor, the first input end of the third amplifier is connected with the first output end of the second amplifier through the third resistor, and the first output end of the third amplifier is connected with the second input end of the third amplifier; the differential subtraction module comprises a fourth amplifier, a fourth resistor, a fifth resistor and a sixth resistor, the first output end of the first amplifier is connected with the first input end of the fourth amplifier through the fourth resistor, the first output end of the third amplifier is connected with the second input end of the fourth amplifier through the fifth resistor, and the first output end of the fourth amplifier is connected with the second input end of the fourth amplifier through the sixth resistor; wherein the first output end of the fourth amplifier is connected with the viewing angle control box of the display module.

[0008] Optionally, the control module comprises a timing controller and a microcontroller, the timing controller is connected with the microcontroller, the timing controller is used for outputting a pulse width modulation waveform to the microcontroller, the microcontroller receives the pulse width modulation waveform output by the timing controller and outputs the first control signal or the second control signal to the analog module according to the received pulse width modulation waveform; wherein the microcontroller comprises a flash memory, the flash memory simulates an electrically erasable programmable read-only memory for storing driving data for driving a display panel.

[0009] Optionally, the driving circuit further includes an ambient light sensor, which is connected to both the timing controller and the microcontroller. The ambient light sensor is used to detect the intensity of external light and transmit the detection result to the timing controller and the microcontroller. The microcontroller controls the display brightness of the display panel based on the detection result.

[0010] Optionally, the display module further includes a backlight module, and the control module includes a light-emitting diode (LED) driver chip. The LED driver chip is connected to the microcontroller and the backlight module. The microcontroller outputs an adjustment signal to the LED driver chip based on the detection result of the ambient light sensor. The LED driver chip adjusts the intensity of the light emitted by the backlight module according to the adjustment signal to control the display brightness of the display panel.

[0011] Optionally, the timing controller, the microcontroller, the ambient light sensor, and the LED driver chip are all connected via an integrated circuit bus.

[0012] Optionally, a printed circuit board is also included, on which both the control module and the simulation module are mounted.

[0013] This application also discloses a driving method for driving the driving circuit described above, comprising the following steps:

[0014] Output the corresponding control signal according to the display mode selected by the user;

[0015] The output control signal corresponds to the output drive analog signal; and,

[0016] The analog driving signal drives the view control box to work;

[0017] The control signal includes a first control signal and a second control signal. When the control module outputs the first control signal to the simulation module, the simulation module calls the first drive simulation signal corresponding to the privacy mode and outputs it to the viewing angle control box of the display module to achieve the privacy display function. When the control module outputs the second control signal to the simulation module, the simulation module calls the second drive simulation signal corresponding to the privacy mode and outputs it to the viewing angle control box of the display module to achieve the normal display function.

[0018] This application also discloses a display device, including a display module and a driving circuit as described above, wherein the driving circuit is used to drive the display module.

[0019] This application employs a control module and an analog module. The control module can output corresponding control signals to the analog module according to the display mode selected by the user. After receiving the control signals, the analog module can directly supply them for use, since the control signals are signals with alternating high and low levels. The functions of the digital-to-analog converter module and the external analog circuit are integrated into the analog module, eliminating the need for a separate digital-to-analog converter module to convert the original I2C digital signals into analog signals before operation. This saves a digital-to-analog converter module, thereby reducing the space required for the drive circuit and saving electrical components. Attached Figure Description

[0020] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a driving circuit according to the first embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the simulation module in the first embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the structure of a driving circuit according to a second embodiment of this application;

[0024] Figure 4 This is a flowchart of the steps of a driving method according to the third embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of a display device according to the fourth embodiment of this application.

[0026] Among them, 100 is the driving circuit; 110 is the control module; 120 is the analog module; 121 is the input level conversion module; 122 is the first proportional amplifier module; 123 is the second proportional amplifier module; 124 is the follower output module; 125 is the differential subtraction module; 130 is the ambient light sensor; 140 is the light-emitting diode driver chip; 150 is the printed circuit board; 160 is the display module; and 200 is the display device. Detailed Implementation

[0027] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0028] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0029] In addition, terms such as “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” that indicate orientation or positional relationship are based on the orientation or relative positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] An electric quadrant (EQ) is a device attached to the light-emitting surface of a display panel. The EQ contains a first electrode, a second electrode, and a liquid crystal layer sandwiched between the first and second electrodes. The EQ controls the electric field between the first and second electrodes by changing the magnitude of the input driving voltage signal, which causes the liquid crystal in the liquid crystal layer to deflect. This controls the light emitted from the display panel that can pass through the EQ, allowing the display module (LCD Module, LCM) equipped with the EQ to switch between privacy screen display and normal display.

[0033] Current viewing angle control box (EQ) drive circuits typically use a microcontroller (MCU) to output an I2C digital signal to a digital-to-analog converter (DAC). The DAC converts the I2C digital signal into an analog drive signal, which is then used by an external analog circuit (OP) to adjust the drive voltage required by the viewing angle control box (EQ), thereby achieving dynamic control of the viewing angle. Considering that current viewing angle control box (EQ) drive circuits are relatively complex, require many components, and occupy significant printed circuit board space when used in laptops, leading to high internal design space requirements and thus high privacy protection costs, the inventors have developed the following solution:

[0034] like Figure 1 and Figure 2As shown in the first embodiment of this application, a driving circuit 100 is disclosed for driving a display module 160. The display module 160 includes a display panel and a viewing angle control box EQ attached to the display panel. The driving circuit 100 includes a control module 110 and an analog module 120. The control module 110 is connected to the analog module 120. The control module 110 outputs a corresponding control signal IO according to the display mode selected by the user. Ctrl to the simulation module 120. The simulation module 120 receives the control signal and outputs a corresponding drive analog signal (Analog) to the viewing angle control box (EQ) of the display module 160 according to the control signal. The control signal includes a first control signal and a second control signal. When the control module 110 outputs the first control signal to the simulation module 120, the simulation module 120 calls the first drive analog signal corresponding to the privacy mode and outputs it to the viewing angle control box (EQ) of the display module 160 to achieve the privacy display function. When the control module 110 outputs the second control signal to the simulation module 120, the simulation module 120 calls the second drive analog signal corresponding to the normal display mode and outputs it to the viewing angle control box (EQ) of the display module 160 to achieve the normal display function. It should be noted that the control signal can be a DC signal or a square wave signal. The user can choose the design according to actual needs. In this embodiment, the control signal is preferably a square wave signal.

[0035] Compared to the current view control box EQ drive circuit 100, this application uses a control module 110 and an analog module 120. The control module 110 can output the corresponding control signal to the analog module 120 according to the display mode selected by the user. After receiving the control signal, the analog module 120 can directly supply the signal to the analog module 120 for use, since the control signal is a signal with alternating high and low levels. The functions of the digital-to-analog converter module (DAC) and the external analog circuit are integrated into the analog module 120. There is no need to set up a digital-to-analog converter module (DAC) to convert the original I2C digital signal into an analog signal before operation, thus saving a digital-to-analog converter module (DAC), thereby reducing the space required by the drive circuit 100 and saving electrical components.

[0036] To output corresponding first and second drive analog signals based on the first and second control signals, the analog module 120 includes an input level conversion module 121, a first proportional amplifier module 122, a second proportional amplifier module 123, a follower output module 124, and a differential subtraction module 125. The input level conversion module 121 converts the control signal into a first voltage value and provides it to the first and second proportional amplifier modules 122 and 123. The first and second proportional amplifier modules 122 and 123 amplify the first voltage value to obtain a second voltage value. The follower output module 124 converts the second voltage value obtained by the second proportional amplifier module 123 into a third voltage value. The differential subtraction module 125 scales the second voltage value obtained by the first proportional amplifier module 122 and the third voltage value obtained by the follower output module 124 to obtain a first drive analog signal corresponding to the first control square wave or a second drive analog signal corresponding to the second control signal. It should be noted that both the first and second drive analog signals include a set of positive and negative symmetrical voltage signals. This design ensures that the first and second driving analog signals can cause polarity reversal in the liquid crystal when driving the viewing angle control box EQ, preventing the deflection angle from falling short of the standard due to the inertia of the liquid crystal. Specifically, the first proportional amplification module 122 is an AC proportional amplification module, the second proportional amplification module 123 is a DC proportional amplification module, and the follower output module 124 is a DC follower output module 124. After the input level conversion module 121 converts the control signal into a first voltage value, the AC and DC proportional amplification modules amplify the first voltage value to obtain a second voltage value. The second voltage value obtained by the DC proportional amplification module is then converted into a third voltage value by the DC follower output module 124. The third voltage value obtained by the DC follower output module 124 is then proportionally scaled with the second voltage value obtained by the AC proportional amplification module in the differential subtraction module 125 to obtain the first or second driving analog signal required to drive the viewing angle control box EQ, thereby driving the viewing angle control box EQ for privacy protection or normal display. In this embodiment, the first voltage value is less than the second voltage value, and the third voltage value is less than the second voltage value.

[0037] Specifically, such as Figure 2As shown, the input level conversion module 121 includes a first transistor Q1, a second transistor Q2, and a first power input terminal Vref. The first power input terminal Vref is connected to the source of the first transistor Q1 and the second transistor Q2. The control module 110 is connected to the gate of the first transistor Q1 and the second transistor Q2 to control the conduction and turn-off of the first transistor Q1 and the second transistor Q2 according to the first control signal and the second control signal output by the control module. The drain of the first transistor Q1 and the second transistor Q2 is connected to ground. The first proportional amplifier module 122 includes a first amplifier, a third transistor Q3, and a first resistor R1. The control module 110 is connected to the gate of the third transistor Q3. The first amplifier is connected to the first power input terminal Vref and the source of the first transistor Q1. The second input terminal of the first amplifier is connected to the drain of the third transistor Q3. The first output terminal of the first amplifier is connected to the second input terminal of the first amplifier through the first resistor R1. The source of the third transistor Q3 is connected to ground. The second proportional amplifier module 123 includes a second amplifier, a fourth transistor Q4, and a second resistor R2. The control module 110 is connected to the gate of the fourth transistor. The first input terminal of the second amplifier is connected to the first power input terminal Vref and the source of the second transistor Q2. The second input terminal of the second amplifier is connected to the drain of the third transistor Q3. The first output terminal of the second amplifier is connected to the drain of the fourth transistor Q4, and the second input terminal of the second amplifier is connected to the second input terminal of the second amplifier through the second resistor R2. The source of the fourth transistor Q4 is connected to the ground terminal. The follower output module 124 includes a third amplifier and a third resistor R3. The first input terminal of the third amplifier is connected to the first output terminal of the second amplifier through the third resistor R3, and the first output terminal of the third amplifier is connected to the second input terminal of the third amplifier. The differential subtraction module 125 includes a fourth amplifier, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first output terminal of the first amplifier is connected to the first input terminal of the fourth amplifier through the fourth resistor R4. The first output terminal of the third amplifier is connected to the second input terminal of the fourth amplifier through a fifth resistor R5. The first output terminal of the fourth amplifier is connected to the second input terminal of the fourth amplifier through a sixth resistor R6. The first output terminal of the fourth amplifier is connected to the viewing angle control box EQ of the display module 160. The control module 110 includes a first square wave output terminal EQ-PWM, a viewing angle control terminal EQ-Ctrl1, and a test terminal EQ-Ctrl2. The first square wave output terminal EQ-PWM is connected to the gate of the first transistor Q1. The viewing angle control terminal EQ-Ctrl1 is connected to the gate of the third transistor Q3. The test terminal EQ-Ctrl2 is connected to the gate of the second transistor Q2.

[0038] When the viewing angle control box EQ is in privacy mode, the first square wave output terminal EQ-PWM outputs a high / low level change signal to control the source and drain of the first transistor Q1 to turn on and off. The viewing angle control terminal EQ-Ctrl1 outputs a high-level signal to control the source and drain of the third transistor Q3 and the fourth transistor Q4 to turn on. The test terminal EQ-Ctrl2 outputs a low-level signal to control the source and drain of the second transistor Q2 to turn off. When the viewing angle control box EQ is in normal display mode, the first square wave output terminal EQ-PWM outputs a high / low level change signal to control the source and drain of the first transistor Q1 to turn on and off. The viewing angle control terminal EQ-Ctrl1 outputs a low-level signal to control the source and drain of the second transistor Q2 to turn off. The sources and drains of transistors Q3 and Q4 are turned off. The test terminal EQ-Ctrl2 outputs a low-level signal to control the source and drain of transistor Q2 to turn off. The viewing angle control box EQ also has a test phase. During the test phase, the first square wave output terminal EQ-PWM outputs a high-level signal to control the source and drain of transistor Q1 to turn on. The viewing angle control terminal EQ-Ctrl1 outputs a low-level signal to control the sources and drains of transistors Q3 and Q4 to turn off. The test terminal EQ-Ctrl2 outputs a high-level signal to control the source and drain of transistor Q2 to turn on. The three display modes of the viewing angle control box EQ are as follows:

[0039] Taking the input voltage of the first power input terminal Vref as 2.5V as an example

[0040] When the viewing angle control box (EQ) is set to privacy mode, the voltage at the first input terminal of the first amplifier is 2.5V. The voltage at the second input terminal of the first amplifier is formed by pulling down the voltage output from the first output terminal of the first amplifier through the first resistor R1, thus making the voltage output from the first output terminal of the first amplifier greater than the voltage at the first input terminal. At this time, the voltage output from the first output terminal of the first amplifier is approximately 7.577V. The voltage at the first input terminal of the second amplifier is also 2.5V. The voltage at the second input terminal of the second amplifier is formed by pulling down the voltage output from the first output terminal of the second amplifier through the second resistor R2, thus making the voltage output from the first output terminal of the second amplifier greater than the voltage at the first input terminal. At this time, the voltage at the first output terminal of the second amplifier is approximately 7.577V. The voltage at the first input terminal of the third amplifier is formed by pulling down the voltage output from the first output terminal of the second amplifier through the second resistor R2, thus making the voltage output from the first output terminal of the second amplifier greater than the voltage at the first input terminal. At this time, the voltage at the first output terminal of the second amplifier is approximately 7.577V. The voltage at the first input terminal of the third amplifier is formed by pulling down the voltage output from the first output terminal of the second amplifier through the second resistor R2. The voltage output from the first output terminal is formed by pulling down the third resistor R3. The voltage at the second input terminal of the third amplifier is formed by the voltage input from the first output terminal of the third amplifier. At this time, the voltage at the first output terminal of the third amplifier is approximately 3.788V. The voltage at the first input terminal of the fourth amplifier is formed by pulling down the voltage at the first output terminal of the first amplifier through the fourth resistor R4. The voltage input to the first input terminal of the fourth amplifier is approximately 4.33V. The voltage at the second input terminal of the fourth amplifier is formed by pulling down the voltage at the first output terminal of the third amplifier through the fifth resistor R5. The voltage input to the second input terminal of the fourth amplifier is approximately 2.165V. At this time, the output voltage at the first output terminal of the fourth amplifier is approximately ±5.05V. The output voltage at the first output terminal of the fourth amplifier is output to the viewing angle control box EQ to provide the driving voltage required for the viewing angle control box EQ when the privacy display is activated.

[0041] When the viewing angle control box EQ is in normal display mode, the voltage at the first input terminal of the first amplifier is 2.5V. The voltage at the second input terminal of the first amplifier is formed by pulling down the voltage output from the first output terminal of the first amplifier through the first resistor R1. At this time, the voltage output from the first output terminal of the first amplifier is approximately 3.91V. The voltage at the first input terminal of the second amplifier is also 2.5V. The voltage at the second input terminal of the second amplifier is formed by pulling down the voltage output from the first output terminal of the second amplifier through the second resistor R2. At this time, the voltage at the first output terminal of the second amplifier is approximately 3.91V. The voltage at the first input terminal of the third amplifier is formed by pulling down the voltage output from the first output terminal of the second amplifier through the third resistor R3. The voltage at the second input terminal of the third amplifier is formed by pulling down the voltage output from the first output terminal of the second amplifier through the third resistor R3. The voltage input to the first output terminal of the third amplifier is formed, and the voltage at the first output terminal of the third amplifier is approximately 1.955V. The voltage at the first input terminal of the fourth amplifier is formed by pulling down the voltage at the first output terminal of the first amplifier through the fourth resistor R4, and the voltage output to the first input terminal of the fourth amplifier is approximately 2.234V. The voltage at the second input terminal of the fourth amplifier is formed by pulling down the voltage at the first output terminal of the third amplifier through the fifth resistor, and the voltage input to the second input terminal of the fourth amplifier is approximately 1.117V. At this time, the output voltage at the first output terminal of the fourth amplifier is approximately ±2.61V. The output voltage at the first output terminal of the fourth amplifier is fed to the viewing angle control box EQ to provide the driving voltage required for the viewing angle control box EQ to perform the privacy display.

[0042] The first proportional amplifier module 122 further includes a seventh resistor R7 and an eighth resistor R8. One end of the seventh resistor R7 is connected between the drain of the first transistor Q1 and the ground terminal, and the other end of the seventh resistor R7 is connected between the drain of the third transistor Q3 and the second input terminal of the first amplifier. One end of the eighth resistor R8 is connected to the drain of the third transistor Q3, and the other end of the eighth resistor R8 is connected to the second input terminal of the first amplifier. The seventh resistor R7 and the eighth resistor R8 are used to divide the voltage input to the second input terminal of the first amplifier. The second proportional amplifier module 123 further includes a ninth resistor R9, a tenth resistor R10, and a... The eleventh resistor R11 is used to control the input to the second amplifier. One end of the ninth resistor R9 is connected between the drain of the second transistor Q2 and ground, and the other end of the ninth resistor R9 is connected between the drain of the fourth transistor Q4 and the second input of the second amplifier. One end of the tenth resistor R10 is connected to the drain of the fourth transistor Q4, and the other end of the tenth resistor R10 is connected to the second input of the second amplifier. One end of the eleventh resistor R11 is connected between the view control terminal EQ-Ctrl1 and the gate of the fourth transistor Q4, and the other end of the eleventh resistor R11 is connected between the source of the fourth transistor Q4 and ground. The ninth resistor R9 and the tenth resistor R10 are used to control the input to the second amplifier. The voltage at the second input terminal of the second amplifier is divided, and the eleventh resistor is used to protect the circuit from excessive voltage. The follower output module 124 also includes a twelfth resistor R12, one end of which is connected between the third resistor R3 and the first input terminal of the third amplifier, and the other end of which is connected to ground. The twelfth resistor R12 is used to divide the voltage input to the first input terminal of the third amplifier. The differential subtraction module 125 also includes a thirteenth resistor R13 and a first capacitor C1. One end of the thirteenth resistor R13 is connected between the fourth resistor R4 and the first input terminal of the fourth amplifier, and the other end of which is connected to ground. The first capacitor C1 is connected to the ground terminal. One end of the first capacitor C1 is connected between the fifth resistor R5 and the second input terminal of the fourth amplifier. The other end of the first capacitor C1 is connected to the first output terminal of the fourth amplifier. The thirteenth resistor R13 is used to divide the voltage input to the first input terminal of the fourth amplifier. The first capacitor C1 is used to provide phase compensation for the output at high frequencies. In general, through the above design of the driving circuit 100, the analog module 120 of the driving circuit 100 in this embodiment can output a first driving analog signal corresponding to the privacy display and a second driving analog signal corresponding to the normal display according to the control signal output by the control module 110, so as to realize the viewing angle switching of the viewing angle control box EQ.

[0043] Furthermore, the control module 110 includes a timing controller Tcon and a microcontroller MCU. The timing controller Tcon is connected to the microcontroller MCU and outputs a pulse width modulation (PWM) waveform to the microcontroller MCU. The microcontroller MCU receives the PWM waveform output by the timing controller Tcon and outputs a first control signal or a second control signal to the analog module 120 based on the received PWM waveform. The microcontroller MCU includes a flash memory, which simulates an electrically erasable programmable read-only memory (EEPROM) to store driving data for driving the display panel. In this embodiment, by using the flash memory in the microcontroller MCU and simulating the function of the EEPROM, the driving circuit 100 can eliminate the need for an EEPROM, reducing the manufacturing cost of the driving circuit 100 and the space required by the driving circuit 100, thus better achieving a thinner and lighter display device 200.

[0044] like Figure 3 As shown, as a second embodiment of this application and an improvement on the first embodiment, a driving circuit 100 is disclosed. The driving circuit 100 further includes an ambient light sensor 130 (ALS). The ambient light sensor 130 is connected to both the timing controller Tcon and the microcontroller MCU. The ambient light sensor 130 is used to detect the intensity of external light and transmits the detection result to the timing controller Tcon and the microcontroller MCU. The microcontroller MCU controls the display brightness of the display panel based on the detection result, thereby enabling the display device 200 with the driving circuit 100 to dynamically adjust the display brightness of the display panel according to changes in the intensity of ambient light, allowing users to better use the display device 200 without manually adjusting the display brightness.

[0045] Furthermore, the display module 160 also includes a backlight module (BLU), and the control module 110 includes an LED driver IC (LED). The LED driver IC 140 is connected to the microcontroller (MCU) and the backlight module. The microcontroller (MCU) outputs an adjustment signal to the LED driver IC 140 based on the detection result of the ambient light sensor (130). The LED driver IC 140 adjusts the intensity of the backlight emitted by the backlight module according to the adjustment signal to control the display brightness of the display panel. The timing controller (Tcon), the microcontroller (MCU), the ambient light sensor (130), and the LED driver IC 140 are all connected via an integrated circuit bus (I2C). When the ambient light sensor (130) detects high ambient light intensity, the microcontroller (MCU) will adjust the LED driver IC based on the detection result of the ambient light sensor (130). An adjustment signal to increase the light intensity is output to the LED driver chip 140. The LED driver chip 140 increases the light intensity of the backlight module according to the adjustment signal, so that the user can better read the displayed content on the display device 200. When the ambient light sensor 130 detects that the ambient light intensity is low, the microcontroller MCU outputs an adjustment signal to decrease the light intensity to the LED driver chip 140 according to the detection result of the ambient light sensor 130. The LED driver chip 140 decreases the light intensity of the backlight module according to the adjustment signal, so as to save the power consumption of the display device 200 and adapt to the ambient light intensity for display, thereby improving the user experience when reading the displayed content on the display device 200.

[0046] Furthermore, it can adjust the brightness according to the ambient light intensity for both privacy display mode and normal display mode, ensuring that the brightness can be adjusted in both modes. This avoids insufficient brightness in privacy display mode and meets the display brightness needs of different users under varying lighting conditions throughout the day.

[0047] The driving circuit 100 also includes a printed circuit board 150. The control module 110 and the analog module 120 are both mounted on the printed circuit board 150. Compared with the current driving circuit 100 of the viewing angle control box EQ, this application integrates the functions of the digital-to-analog converter (DAC) module and the external analog circuit into the analog module 120. There is no need to set up a DAC module to convert the original I2C digital signal into an analog signal before operation, thus saving a DAC module and saving the space occupied by the driving circuit 100 on the printed circuit board 150. At the same time, it saves the electrical components of the DAC module and reduces the manufacturing cost.

[0048] like Figure 4 As shown, as a third embodiment of this application, a driving method is disclosed for driving the driving circuit 100 as described above. The driving method includes the following steps:

[0049] Output the corresponding control signal according to the display mode selected by the user;

[0050] The output control signal corresponds to the output drive analog signal; and,

[0051] The analog driving signal drives the view control box to work;

[0052] The control signals include a first control signal and a second control signal. When the control module 110 outputs the first control signal to the simulation module 120, the simulation module 120 calls the first drive simulation signal corresponding to the privacy mode and outputs it to the viewing angle control box EQ of the display module 160 to achieve the privacy display function. When the control module 110 outputs the second control signal to the simulation module 120, the simulation module 120 calls the second drive simulation signal corresponding to the privacy mode and outputs it to the viewing angle control box EQ of the display module 160 to achieve the normal display function.

[0053] By integrating the functions of the digital-to-analog converter (DAC) module and the external analog circuit into the analog module 120, there is no need to set up a separate DAC module to convert the original I2C digital signal into an analog signal before operation. This eliminates the need for a separate DAC module, thereby saving space and electrical components required by the drive circuit 100.

[0054] like Figure 5 As shown, as the fourth embodiment of this application, a display device 200 is disclosed. The display device 200 includes a display module 160 and a driving circuit 100 as described above. The driving circuit 100 is used to drive the display module 160. The display device 200 of this application adopts a control module 110 and an analog module 120. The control module 110 can output a corresponding control signal to the analog module 120 according to the display mode selected by the user. After receiving the control signal, the analog module 120 can directly supply the control signal to the analog module 120 for use, since the control signal is a signal with alternating high and low levels. The functions of the digital-to-analog converter (DAC) module and the external analog circuit are integrated into the analog module 120. There is no need to set up a DAC module to convert the original I2C digital signal into an analog signal before operation. This saves the space and electrical components required by the driving circuit 100, reduces the manufacturing cost of the display device 200 to a certain extent, and is conducive to the thinning of the display device 200.

[0055] It should be noted that the limitations on each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the scope of protection of this application.

[0056] The technical solution of this application can be widely used in various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, and MVA (Multi-Domain Vertical Alignment) display panels. Of course, it can also be used in other types of display panels, such as OLED (Organic Light-Emitting Diode) display panels, all of which are applicable to the above solution.

[0057] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0058] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A driving circuit for driving a display module, the display module comprising a display panel and a viewing angle control box attached to the display panel, characterized in that, The driving circuit comprises a control module and an analog module, the control module is connected with the analog module, the control module outputs corresponding control signals to the analog module according to the display mode selected by a user, the analog module receives the control signals and outputs corresponding driving analog signals to a viewing angle control box of a display module according to the control signals; The analog module comprises an input level conversion module, a first proportional amplification module, a second proportional amplification module, a follow-up output module and a differential subtraction module, the input level conversion module converts the control signals into first voltage values and provides the first voltage values to the first proportional amplification module and the second proportional amplification module, the first proportional amplification module and the second proportional amplification module amplify the first voltage values to obtain second voltage values, the follow-up output module converts the second voltage values obtained by the second proportional amplification module into third voltage values, and the differential subtraction module proportionally scales the second voltage values obtained by the first proportional amplification module and the third voltage values obtained by the follow-up output module to obtain first driving analog signals corresponding to the first control signals or second driving analog signals corresponding to the second control signals; The input level conversion module comprises a first transistor, a second transistor and a first power input end, the first power input end is connected with the sources of the first transistor and the second transistor, the control module is connected with the gates of the first transistor and the second transistor, and the drains of the first transistor and the second transistor are connected with a ground end; The second proportional amplification module comprises a second amplifier, a fourth transistor and a second resistor, the control module is connected with the gate of the fourth transistor, a first input end of the second amplifier is connected between the first power input end and the source of the second transistor, a second input end of the second amplifier is connected with the drain of the fourth transistor, a first output end of the second amplifier is connected with the second input end of the second amplifier through the second resistor, and the source of the fourth transistor is connected with the ground end; The follow-up output module comprises a third amplifier and a third resistor, a first input end of the third amplifier is connected with the first output end of the second amplifier through the third resistor, and a first output end of the third amplifier is connected with a second input end of the third amplifier; The control signals comprise first control signals and second control signals, when the control module outputs the first control signals to the analog module, the analog module calls the first driving analog signals corresponding to the anti-peeping mode and outputs the first driving analog signals to the viewing angle control box of the display module to realize the anti-peeping display function, and when the control module outputs the second control signals to the analog module, the analog module calls the second driving analog signals corresponding to the normal display mode and outputs the second driving analog signals to the viewing angle control box of the display module to realize the normal display function; The first driving analog signals and the second driving analog signals both comprise a group of positive and negative symmetric voltage signals; The control signals are direct current signals or square wave signals.

2. The drive circuit according to claim 1, characterized in that, The first proportional amplification module comprises a first amplifier, a third transistor and a first resistor, the control module is connected with a gate of the third transistor, a first input end of the first amplifier is connected between the first power input end and a source of the first transistor, a second input end of the first amplifier is connected with a drain of the third transistor, a first output end of the first amplifier is connected with the second input end of the first amplifier through the first resistor, and a source of the third transistor is connected with a ground end; The differential subtraction module comprises a fourth amplifier, a fourth resistor, a fifth resistor and a sixth resistor, a first output end of the first amplifier is connected with a first input end of the fourth amplifier through the fourth resistor, a first output end of the third amplifier is connected with a second input end of the fourth amplifier through the fifth resistor, and a first output end of the fourth amplifier is connected with the second input end of the fourth amplifier through the sixth resistor. The first output end of the fourth amplifier is connected with the viewing angle control box of the display module.

3. The drive circuit according to claim 1, characterized by The control module comprises a timing controller and a microcontroller, the timing controller is connected with the microcontroller, the timing controller is used for outputting a pulse width modulation waveform to the microcontroller, the microcontroller receives the pulse width modulation waveform output by the timing controller and outputs a first control signal or a second control signal to the analog module according to the received pulse width modulation waveform. The microcontroller comprises a flash memory, the flash memory simulates an electrically erasable programmable read-only memory and is used for storing driving data for driving the display panel.

4. The drive circuit according to claim 3, characterized in that, The display module further comprises an ambient light sensor, the ambient light sensor is connected with the timing controller and the microcontroller, the ambient light sensor is used for detecting external light intensity and transmitting a detection result to the timing controller and the microcontroller, and the microcontroller controls display brightness of the display panel through the detection result.

5. The drive circuit according to claim 4, characterized in that, The display module further comprises a backlight module, the control module comprises a light-emitting diode driving chip, the light-emitting diode driving chip is connected with the microcontroller and the backlight module, the microcontroller outputs an adjustment signal to the light-emitting diode driving chip according to the detection result of the ambient light sensor, and the light-emitting diode driving chip adjusts light intensity of the backlight module according to the adjustment signal to control the display brightness of the display panel.

6. The drive circuit according to claim 5, characterized in that, The timing controller, the microcontroller, the ambient light sensor and the light-emitting diode driving chip are connected through an integrated circuit bus.

7. The drive circuit of claim 1, wherein The control module and the analog module are arranged on the printed circuit board.

8. A driving method for driving the driving circuit according to any one of claims 1 to 7, characterized by, The method comprises the following steps: Outputting a corresponding control signal according to a display mode selected by a user; Outputting a driving analog signal according to the output control signal; and Driving the viewing angle control box to work through the driving analog signal. The control signal includes a first control signal and a second control signal, when the control module outputs the first control signal to the analog module, the analog module calls a first driving analog signal corresponding to a privacy mode and outputs to a viewing angle control box of a display module to realize a privacy display function; when the control module outputs the second control signal to the analog module, the analog module calls a second driving analog signal corresponding to the privacy mode and outputs to the viewing angle control box of the display module to realize a normal display function.

9. A display device, characterized by comprising: The display module is driven by the driving circuit as claimed in any one of claims 1 to 7.

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