A liquid crystal display and its driving device

Abstract

This utility model discloses a liquid crystal display and its driving device. The device includes: a liquid crystal driver chip that outputs a driving signal; an anti-interference unit disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen, which receives the driving signal output by the liquid crystal driver chip and performs anti-electromagnetic interference processing on the driving signal to reduce or even eliminate electromagnetic interference signals in the driving signal output by the liquid crystal driver chip, thereby obtaining an anti-electromagnetic interference signal of the driving signal output by the liquid crystal driver chip, denoted as the anti-electromagnetic interference driving signal of the liquid crystal driver chip; and a liquid crystal display screen that receives the anti-electromagnetic interference driving signal of the liquid crystal driver chip and displays based on the anti-electromagnetic interference driving signal of the liquid crystal driver chip. This solution improves the anti-interference capability of the liquid crystal driver chip and enhances the display performance of the liquid crystal display screen by performing anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display technology, specifically relating to a driving device for a liquid crystal display and a liquid crystal display, and more particularly to an anti-electromagnetic interference liquid crystal driving system based on waveform detection and a liquid crystal display. Background Technology

[0002] Liquid crystal displays (LCDs) are widely used in various electronic devices, such as televisions, computer monitors, and smartphones. The LCD driver chip is responsible for controlling the display on the LCD panel (the panel of the LCD), but the LCD driver chip is susceptible to electromagnetic interference, which can affect the display performance of the LCD panel.

[0003] The above content is only used to help understand the technical solution of this utility model and does not represent an admission that the above content is prior art. Utility Model Content

[0004] The purpose of this invention is to provide a driving device and a liquid crystal display (LCD) to solve the problem that the liquid crystal driving chip controls the display of the liquid crystal panel (i.e., the LCD screen) in the LCD, but the liquid crystal driving chip is susceptible to electromagnetic interference, which affects the display performance of the liquid crystal panel. The invention achieves the effect of improving the anti-interference capability of the liquid crystal driving chip and improving the display performance of the LCD screen by processing the driving signal output by the liquid crystal driving chip to resist electromagnetic interference.

[0005] This utility model provides a driving device for a liquid crystal display (LCD), the LCD having a liquid crystal driver chip and a liquid crystal display screen; the driving device for the LCD includes an anti-interference unit; wherein, the liquid crystal driver chip is used to output a driving signal; the driving signal output by the liquid crystal driver chip is a signal used to drive the liquid crystal display screen to display; the anti-interference unit is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen, and is used to receive the driving signal output by the liquid crystal driver chip and perform anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip to reduce or even eliminate the electromagnetic interference signal in the driving signal output by the liquid crystal driver chip, thereby obtaining an anti-electromagnetic interference signal of the driving signal output by the liquid crystal driver chip, denoted as the anti-electromagnetic interference driving signal of the liquid crystal driver chip; the liquid crystal display screen is used to receive the anti-electromagnetic interference driving signal of the liquid crystal driver chip and display based on the anti-electromagnetic interference driving signal of the liquid crystal driver chip.

[0006] In some embodiments, the anti-interference unit includes: a first protection module and / or a second protection module; wherein, the anti-interference unit performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip, including: the first protection module being used to perform overvoltage protection processing on the transient voltage signal in the driving signal output by the liquid crystal driver chip; and the second protection module being used to release the remaining interference signal in the driving signal output by the liquid crystal driver chip.

[0007] In some embodiments, the first protection module includes a TVS diode module; and / or the second protection module includes an RC absorption module; the RC absorption module includes a resistor module and a capacitor module; wherein, when the anti-interference unit includes a first protection module and a second protection module, the output terminal of the liquid crystal driver chip is connected to the cathode of the TVS diode module, and the anode of the TVS diode module is grounded; the cathode of the TVS diode module is also grounded via the resistor module and the capacitor module; the common terminal of the resistor module and the capacitor module is connected to the input terminal of the liquid crystal display screen.

[0008] In some embodiments, when the anti-interference unit includes a first protection module and a second protection module, the first protection module and the second protection module are sequentially disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen; wherein, the anti-interference unit performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip, specifically including: the first protection module is used to perform overvoltage protection processing on the transient voltage signal in the driving signal output by the liquid crystal driver chip to obtain a first driving protection signal; the second protection module is used to release the remaining interference signal in the first driving protection signal.

[0009] In some embodiments, the anti-interference unit further includes: a filtering module; wherein the filtering module is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the first protection module; or, the filtering module is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the second protection module; the anti-interference unit performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip, further including: the filtering module is used to filter out noise signals of a set frequency in the driving signal output by the liquid crystal driver chip to obtain a second driving signal; the first protection module is used to perform overvoltage protection processing on transient voltage signals in the second driving signal; the second protection module is used to release residual interference signals in the second driving signal.

[0010] In some embodiments, the filtering module includes a ferrite bead module; wherein, when the anti-interference unit includes a first protection module, a second protection module, and the filtering module, and the first protection module includes a TVS diode module, and the second protection module includes a resistor module and a capacitor module, the output terminal of the liquid crystal driver chip is connected to the cathode of the TVS diode module after passing through the filtering module, and the anode of the TVS diode module is grounded; the cathode of the TVS diode module is also grounded after passing through the resistor module and the capacitor module; the common terminal of the resistor module and the capacitor module is connected to the input terminal of the liquid crystal display screen.

[0011] In some embodiments, the system further includes: a sensor unit, a waveform detection unit, and a control unit; wherein, the sensor unit is disposed on the output side of the anti-interference unit and is used to detect the residual electromagnetic interference signal in the anti-electromagnetic interference driving signal of the liquid crystal driving chip, denoted as the residual electromagnetic interference signal of the liquid crystal driving chip; the waveform detection unit is disposed on the output side of the anti-interference unit and is used to detect the waveform of the anti-electromagnetic interference driving signal of the liquid crystal driving chip, denoted as the driving output signal waveform of the liquid crystal driving chip; the control unit is further used to combine the residual electromagnetic interference signal of the liquid crystal driving chip and the driving output signal waveform of the liquid crystal driving chip to determine whether the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference; if it is determined that the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference, the control unit adjusts the driving signal output by the liquid crystal driving chip so that the adjusted anti-electromagnetic interference driving signal of the liquid crystal driving chip is not subject to electromagnetic interference.

[0012] In conjunction with the above-mentioned device, this utility model further provides a liquid crystal display, including: the driving device for the liquid crystal display described above.

[0013] In conjunction with the aforementioned liquid crystal display, this utility model further provides a driving method for a liquid crystal display, comprising: outputting a driving signal through the liquid crystal driving chip; the driving signal output by the liquid crystal driving chip is a signal used to drive the liquid crystal display screen for display; receiving the driving signal output by the liquid crystal driving chip through the anti-interference unit, performing anti-electromagnetic interference processing on the driving signal output by the liquid crystal driving chip to reduce or even eliminate electromagnetic interference signals in the driving signal output by the liquid crystal driving chip, obtaining an anti-electromagnetic interference signal of the driving signal output by the liquid crystal driving chip, denoted as the anti-electromagnetic interference driving signal of the liquid crystal driving chip; receiving the anti-electromagnetic interference driving signal of the liquid crystal driving chip through the liquid crystal display screen, and based on the liquid crystal... The anti-electromagnetic interference driving signal of the liquid crystal driving chip is displayed; the residual electromagnetic interference signal in the anti-electromagnetic interference driving signal of the liquid crystal driving chip is detected and recorded as the residual electromagnetic interference signal of the liquid crystal driving chip; and the waveform of the anti-electromagnetic interference driving signal of the liquid crystal driving chip is detected and recorded as the driving output signal waveform of the liquid crystal driving chip; combining the residual electromagnetic interference signal of the liquid crystal driving chip and the driving output signal waveform of the liquid crystal driving chip, it is determined whether the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference; if it is determined that the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference, the driving signal output by the liquid crystal driving chip is adjusted so that the adjusted anti-electromagnetic interference driving signal of the liquid crystal driving chip is not subject to electromagnetic interference.

[0014] In some embodiments, determining whether the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference by combining the residual electromagnetic interference signal of the liquid crystal driving chip and the driving output signal waveform of the liquid crystal driving chip includes: determining whether the strength of the residual electromagnetic interference signal of the liquid crystal driving chip is greater than or equal to a preset interference signal strength threshold, and whether the parameters of the driving output signal waveform of the liquid crystal driving chip are greater than or equal to a preset output signal waveform parameter threshold; if the conditions are met, then it is determined that the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference.

[0015] And / or, adjust the driving signal output by the liquid crystal driver chip, including: adjusting the PWM signal of the liquid crystal driver chip and adjusting the operating frequency band of the liquid crystal driver chip, so as to adjust the driving signal output by the liquid crystal driver chip, so that the parameters of the driving output signal waveform of the liquid crystal driver chip are less than a preset output signal waveform parameter threshold.

[0016] In some embodiments, the method further includes: collecting display parameters of the liquid crystal display screen; evaluating the display status of the liquid crystal display screen based on the display parameters; and optimizing the driving signal output by the liquid crystal driver chip based on the display status of the liquid crystal display screen.

[0017] Therefore, the solution of this utility model, for driving a liquid crystal display, sets up an anti-electromagnetic interference module between the liquid crystal driver chip and the liquid crystal display screen. The anti-electromagnetic interference module performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip to reduce or even eliminate the electromagnetic interference signal in the driving signal output by the liquid crystal driver chip, and then outputs it to the liquid crystal display screen to drive the liquid crystal display screen for display. Thus, by performing anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip, the anti-interference capability of the liquid crystal driver chip is improved, and the display performance of the liquid crystal display screen is improved.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the driving device for a liquid crystal display according to the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of the liquid crystal driving system proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the protection circuit of the anti-electromagnetic interference module proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the detection process of the waveform detection module proposed in this utility model;

[0024] Figure 5 This is a flowchart illustrating an embodiment of the driving method for a liquid crystal display according to the present invention.

[0025] Figure 6 This is a flowchart illustrating an embodiment of the method of the present invention for determining whether the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference.

[0026] Figure 7 This is a flowchart illustrating an embodiment of the method of the present invention, which optimizes the driving signal output by the liquid crystal driver chip based on the feedback of the display parameters of the liquid crystal display screen. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] Considering that the liquid crystal driver chip in a liquid crystal display controls the display of the liquid crystal panel, but the liquid crystal driver chip is susceptible to electromagnetic interference, which can affect the display performance of the liquid crystal panel, such as causing display abnormalities, image distortion, or even malfunction, it is particularly important to design a liquid crystal driver system that can effectively prevent display abnormalities caused by electromagnetic interference and improve the display quality of the liquid crystal display.

[0029] Therefore, the present invention proposes a driving device for a liquid crystal display, specifically an anti-electromagnetic interference liquid crystal driving system based on waveform detection. In the design of the driving circuit of the liquid crystal display, an anti-electromagnetic interference circuit is introduced, and a dual protection circuit is introduced to improve the anti-interference capability of the liquid crystal display and improve the display performance of the liquid crystal panel.

[0030] According to an embodiment of this utility model, a driving device for a liquid crystal display is provided. See also Figure 1 The diagram shows a structural schematic of one embodiment of the device of this utility model. The driving device for the liquid crystal display may include: the liquid crystal display, having a liquid crystal driving chip and a liquid crystal display screen; in the solution of this utility model, as... Figure 1 As shown, the driving device for the liquid crystal display includes: an anti-interference unit, such as... Figure 2 The electromagnetic interference suppression module shown.

[0031] The liquid crystal driver chip is used to output driving signals, such as when the liquid crystal driver chip outputs driving signals under the control of the MCU; the driving signals output by the liquid crystal driver chip are used to drive the liquid crystal display screen to display.

[0032] The anti-interference unit is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen. It is used to receive the driving signal output by the liquid crystal driver chip and perform anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip to reduce or even remove the electromagnetic interference signal in the driving signal output by the liquid crystal driver chip, thereby obtaining the anti-electromagnetic interference signal of the driving signal output by the liquid crystal driver chip, which is denoted as the anti-electromagnetic interference driving signal of the liquid crystal driver chip.

[0033] The liquid crystal display screen is used to receive the anti-electromagnetic interference driving signal from the liquid crystal driver chip and then display based on the anti-electromagnetic interference driving signal from the liquid crystal driver chip.

[0034] The present invention introduces a dual protection circuit in the electromagnetic interference (EMI) module (such as an EMI circuit) of the liquid crystal display driver circuit design. This aims to solve the problem of abnormal display of the liquid crystal panel caused by electromagnetic interference in the liquid crystal driver chip, reduce or eliminate the impact of electromagnetic interference on the liquid crystal display, and enable the liquid crystal display to maintain more stable display performance in an electromagnetic interference environment.

[0035] In some embodiments, the anti-interference unit includes: a first protection module and / or a second protection module, wherein the first protection module is as follows: Figure 3 The TVS tube TVS1 shown, the second protection module is as follows Figure 3 The RC snubber circuit shown.

[0036] The anti-interference unit performs electromagnetic interference protection processing on the driving signal output by the liquid crystal driving chip, including:

[0037] The first protection module is used to perform overvoltage protection processing on the transient voltage signal in the driving signal output by the liquid crystal driver chip.

[0038] The second protection module is used to release the remaining interference signals in the driving signals output by the liquid crystal driver chip.

[0039] In this invention, specific protection measures are incorporated into the driving circuit design of the liquid crystal display (LCD) to enhance its anti-interference capability. Specifically, the invention introduces an anti-electromagnetic interference circuit and a dual protection circuit in the driving circuit design of the LCD, thereby improving the LCD's anti-interference capability and reducing the impact of electromagnetic interference on the LCD.

[0040] In some embodiments, the first protection module includes a TVS diode module; and / or the second protection module includes an RC absorption module; the RC absorption module includes a resistor module and a capacitor module, wherein the resistor module is as follows: Figure 3 The resistor R1 and capacitor module shown are as follows: Figure 3 The capacitor C1 shown.

[0041] In this invention, the anti-electromagnetic interference module forms a dual protection mechanism through the combined action of the RC circuit and the TVS tube TVS1. Even if one component fails, the other component can still provide a certain degree of protection, ensuring signal integrity and system stability, and improving the overall anti-electromagnetic interference performance of the LCD module.

[0042] In the case where the anti-interference unit includes a first protection module and a second protection module, the output terminal of the liquid crystal driver chip is connected to the cathode of the TVS diode module, and the anode of the TVS diode module is grounded; the cathode of the TVS diode module is also grounded after passing through the resistor module and the capacitor module; the common terminal of the resistor module and the capacitor module is connected to the input terminal of the liquid crystal display screen.

[0043] In this invention, the anti-electromagnetic interference module forms a dual protection mechanism through the combined action of an RC circuit and a TVS diode. The TVS diode serves as the first line of defense, while the RC absorption circuit forms the second line of defense. Even if one component fails, the other component can still provide a certain degree of protection, maximizing the processing of electromagnetic interference signals and improving the overall anti-electromagnetic interference performance of the LCD module.

[0044] In some embodiments, when the anti-interference unit includes a first protection module and a second protection module, the first protection module and the second protection module are sequentially disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen.

[0045] The anti-interference unit performs electromagnetic interference protection processing on the driving signal output by the liquid crystal driving chip, specifically including:

[0046] The first protection module is used to perform overvoltage protection processing on the transient voltage signal in the drive signal output by the liquid crystal driver chip to obtain the first drive protection signal.

[0047] The second protection module is used to release the remaining interference signal in the first drive protection signal, and use it as the anti-electromagnetic interference drive signal of the liquid crystal driver chip.

[0048] exist Figure 3 In the example shown, two protective measures are set up for electromagnetic interference prevention: TVS1 provides the first line of defense to handle high-energy transient voltages; resistor R1 and capacitor C1 form an RC absorption circuit, which temporarily stores the remaining energy generated by electromagnetic interference through capacitor C1, and then gradually releases this energy through resistor R1, further reducing the impact on subsequent circuits, so as to greatly reduce the damage caused by transient voltages to sensitive electronic components.

[0049] In some embodiments, the anti-interference unit further includes: a filtering module, such as... Figure 3 The magnetic bead FB1 is shown.

[0050] The filtering module is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the first protection module; or, the filtering module is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the second protection module.

[0051] The anti-interference unit, which performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driving chip, further includes:

[0052] The filtering module is used to filter out noise signals of a set frequency from the driving signal output by the liquid crystal driving chip to obtain a second driving signal.

[0053] The first protection module is used to perform overvoltage protection processing on the transient voltage signal in the second drive signal.

[0054] The second protection module is used to release the remaining interference signal in the second drive signal.

[0055] exist Figure 3 In the example shown, the filtering device in the electromagnetic interference protection circuit, such as the ferrite bead FB1, is used to filter out high-frequency noise.

[0056] In this invention, filtering is performed using a magnetic bead FB1, and a dual protection mechanism is set in the electromagnetic interference protection circuit. The first layer of protection is provided by a TVS, and the RC absorption circuit absorbs and releases the remaining energy, which can better protect the device and improve the anti-interference performance of the liquid crystal.

[0057] In some embodiments, the filtering module includes: a ferrite bead module, such as... Figure 3 The magnetic bead FB1 is shown.

[0058] Wherein, in the anti-interference unit comprising a first protection module, a second protection module, and a filtering module, and the first protection module comprising a TVS diode module, and the second protection module comprising a resistor module and a capacitor module, the output terminal of the liquid crystal driver chip is connected to the cathode of the TVS diode module after passing through the filtering module, and the anode of the TVS diode module is grounded; the cathode of the TVS diode module is also grounded after passing through the resistor module and the capacitor module; the common terminal of the resistor module and the capacitor module is connected to the input terminal of the liquid crystal display screen.

[0059] Figure 3 This is a schematic diagram of the protection circuit of the electromagnetic interference suppression module proposed in this utility model. Figure 3As shown, this is the protection circuit of the electromagnetic interference (EMI) suppression module, i.e., the EMI protection circuit. (As shown...) Figure 3 As shown, the electromagnetic interference (EMI) protection circuit includes: a ferrite bead FB1, a resistor R1, a TVS diode (Transient Voltage Suppressor) TVS1, and a capacitor C1. Power or a signal is input to the first terminal of the ferrite bead FB1; the second terminal of the ferrite bead FB1 is connected to the first terminal of the resistor R1; the second terminal of the resistor R1 is connected to the first terminal of the input side of the waveform detection module. The second terminal of the ferrite bead FB1 is connected to the cathode of the TVS diode TVS1; the anode of the TVS diode TVS1 is grounded (GND); the second terminal of the resistor R1 is connected to the first terminal of the capacitor C1; the second terminal of the capacitor C1 is connected to the second terminal of the input side of the waveform detection module; the second terminal of the capacitor C1 is also grounded (GND).

[0060] exist Figure 3 In the example shown, the function of the electromagnetic interference suppression module is to absorb and release energy when electromagnetic interference is present, thereby reducing its impact on subsequent circuits. The ferrite bead FB1 is used to filter out high-frequency noise, the TVS diode TVS1 is used to handle high-energy transient voltages, and the resistor R1 and capacitor C1 form an RC absorption circuit. The capacitor C1 temporarily stores the remaining energy generated by the electromagnetic interference, and then the resistor R1 gradually releases this energy.

[0061] In some embodiments, the driving device for the liquid crystal display further includes: a sensor unit, a waveform detection unit, and a control unit; the sensor unit is such as an electromagnetic interference sensor, and the waveform detection unit is such as... Figure 2 and Figure 3 The waveform detection module shown has a control unit such as an MCU.

[0062] The sensor unit is located on the output side of the anti-interference unit and is used to detect the residual electromagnetic interference signal in the anti-electromagnetic interference driving signal of the liquid crystal driving chip, which is denoted as the residual electromagnetic interference signal of the liquid crystal driving chip.

[0063] The waveform detection unit is located on the output side of the anti-interference unit and is used to detect the waveform of the anti-electromagnetic interference driving signal of the liquid crystal driving chip, which is denoted as the driving output signal waveform of the liquid crystal driving chip.

[0064] The control unit is further configured to determine whether the anti-electromagnetic interference drive signal of the liquid crystal driver chip is subject to electromagnetic interference by combining the residual electromagnetic interference signal of the liquid crystal driver chip and the drive output signal waveform of the liquid crystal driver chip.

[0065] The control unit is further configured to, if it is determined that the electromagnetic interference (EMI) suppression drive signal of the liquid crystal driver chip is subject to EMI, adjust the drive signal output by the liquid crystal driver chip so that the adjusted EMI suppression drive signal of the liquid crystal driver chip is not subject to EMI. Alternatively, the control unit is also configured to, if it is determined that the EMI suppression drive signal of the liquid crystal driver chip is not subject to EMI, maintain the current state.

[0066] Figure 2 This is a schematic diagram of the overall structure of the liquid crystal driving system proposed in this utility model. Figure 2 In the example shown, the signal output by the MCU is sent to the LCD screen after passing through the electromagnetic interference suppression module; the waveform detection module can detect the output signal waveform of the electromagnetic interference suppression module.

[0067] like Figure 2 As shown, a waveform detection-based anti-electrostatic interference (ESI) liquid crystal driving system includes: an MCU, a liquid crystal driver chip, an ESI module, a waveform detection module, and a liquid crystal display screen. The ESI module incorporates specific protective measures, such as ESI circuitry, into its circuit design to enhance the liquid crystal display's anti-interference capability. The waveform detection module is used to detect the output signal waveform of the ESI module in real time, identify ESI signals, and improve the display quality of the liquid crystal display.

[0068] In this invention, by real-time detection and adjustment of signal waveforms, the stability of the LCD driving system in a strong electromagnetic interference environment is improved, ensuring display quality; extending product lifespan, enhancing user experience, and improving equipment reliability.

[0069] By employing the technical solution of this utility model, an anti-electromagnetic interference module is set between the liquid crystal driver chip and the liquid crystal display screen in the liquid crystal display. The anti-electromagnetic interference module performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip to reduce or even eliminate electromagnetic interference signals in the driving signal output by the liquid crystal driver chip before outputting it to the liquid crystal display screen to drive the liquid crystal display screen for display. Thus, by performing anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip, the anti-interference capability of the liquid crystal driver chip is improved, and the display performance of the liquid crystal display screen is improved.

[0070] According to an embodiment of the present invention, a liquid crystal display (LCD) corresponding to a driving device for a liquid crystal display is also provided. This LCD may include the driving device for the liquid crystal display described above.

[0071] Since the processing and functions implemented by the liquid crystal display in this embodiment are basically corresponding to the embodiments, principles and examples of the device, any details not covered in the description of this embodiment can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0072] According to embodiments of the present invention, a driving method for a liquid crystal display (LCD) is also provided, such as... Figure 5 The diagram shows a flowchart of an embodiment of the method of this utility model. The driving method of the liquid crystal display may include steps S110 to S160.

[0073] In step S110, the liquid crystal driver chip outputs a driving signal, such as when the liquid crystal driver chip outputs a driving signal under the control of the MCU; the driving signal output by the liquid crystal driver chip is a signal used to drive the liquid crystal display screen to display.

[0074] In step S120, after receiving the driving signal output by the liquid crystal driver chip through the anti-interference unit, the anti-electromagnetic interference processing is performed on the driving signal output by the liquid crystal driver chip to reduce or even remove the electromagnetic interference signal in the driving signal output by the liquid crystal driver chip, thereby obtaining the anti-electromagnetic interference signal of the driving signal output by the liquid crystal driver chip, which is denoted as the anti-electromagnetic interference driving signal of the liquid crystal driver chip.

[0075] In step S130, after receiving the anti-electromagnetic interference driving signal from the liquid crystal driver chip through the liquid crystal display screen, the display is performed based on the anti-electromagnetic interference driving signal from the liquid crystal driver chip.

[0076] In step S140, the sensor unit detects the residual electromagnetic interference signal in the anti-electromagnetic interference drive signal of the liquid crystal driver chip, and records it as the residual electromagnetic interference signal of the liquid crystal driver chip; and the waveform detection unit detects the waveform of the anti-electromagnetic interference drive signal of the liquid crystal driver chip, and records it as the drive output signal waveform of the liquid crystal driver chip.

[0077] In step S150, the control unit, in conjunction with the residual electromagnetic interference signal of the liquid crystal driver chip and the waveform of the drive output signal of the liquid crystal driver chip, determines whether the anti-electromagnetic interference drive signal of the liquid crystal driver chip is subject to electromagnetic interference.

[0078] In step S160, if the control unit determines that the electromagnetic interference (EMI) suppression drive signal of the liquid crystal driver chip is subject to EMI, it adjusts the drive signal output by the liquid crystal driver chip to ensure that the adjusted EMI suppression drive signal is not subject to EMI. Conversely, if the control unit determines that the EMI suppression drive signal of the liquid crystal driver chip is not subject to EMI, it maintains the current state.

[0079] In this invention, by real-time detection and adjustment of signal waveforms, the stability of the liquid crystal driving system in a strong electromagnetic interference environment is improved, ensuring display quality, enhancing the anti-electromagnetic interference capability of the liquid crystal driving chip, extending product lifespan, enhancing user experience, and improving equipment reliability.

[0080] In some embodiments, in step S150, the control unit determines whether the anti-electromagnetic interference drive signal of the liquid crystal driver chip is subject to electromagnetic interference by combining the residual electromagnetic interference signal of the liquid crystal driver chip and the drive output signal waveform of the liquid crystal driver chip. The specific process is described in the following exemplary description.

[0081] The following is combined Figure 6 The diagram shows a flowchart of an embodiment of the method of this utility model for determining whether the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference. The specific process of determining whether the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference in step S150 is further explained, including steps S210 to S220.

[0082] Step S210: The control unit determines whether the strength of the residual electromagnetic interference signal of the liquid crystal driver chip is greater than or equal to a preset interference signal strength threshold, and whether the parameters of the drive output signal waveform of the liquid crystal driver chip are greater than or equal to a preset output signal waveform parameter threshold; wherein, the parameters of the drive output signal waveform of the liquid crystal driver chip are, for example, the amplitude, frequency and phase of the output signal waveform of the anti-electromagnetic interference module.

[0083] In step S220, if the control unit determines that the condition is met, it is determined that the anti-electromagnetic interference driving signal of the liquid crystal driving chip is subject to electromagnetic interference; conversely, if the control unit determines that the condition is not met, it is determined that the anti-electromagnetic interference driving signal of the liquid crystal driving chip is not subject to electromagnetic interference.

[0084] Figure 4 This is a schematic diagram of the detection process of the waveform detection module proposed in this utility model. Figure 4 As shown, the detection process of the waveform detection module includes:

[0085] Step 1: Detect electromagnetic interference signals around the LCD driver chip using an electromagnetic interference sensor, and detect the output signal waveform of the anti-electromagnetic interference module in real time using a waveform detection module. Then proceed to Step 2.

[0086] Electromagnetic interference (EMI) sensors are primarily used to detect electromagnetic interference signals around LCD driver chips. They are installed close to the LCD driver chip without affecting other components. By installing EMI sensors around the LCD driver chip, EMI signals around the chip are detected. These sensors can detect the intensity and frequency of EMI signals in real time. Optionally, the EMI sensor is a magnetic field-based sensor. The magnetic field-based sensor is selected based on miniaturization, sensitivity, and power consumption; preferably, it can be a capacitive coupling sensor such as the HWS-EMF series or a MEMS sensor such as the CS32F series.

[0087] In the present invention, the electromagnetic interference sensor is used to detect the intensity of the electromagnetic interference signal remaining after passing through the anti-electromagnetic interference module.

[0088] Step 2: Determine whether the LCD driver chip is being interfered with using a preset interference detection algorithm. If yes, proceed to step 3; otherwise, proceed to step 4.

[0089] Specifically, in step 2, the electromagnetic interference signal detected by the electromagnetic interference sensor and the output signal waveform of the anti-electromagnetic interference module detected and output by the waveform detection module are combined to analyze the amplitude, frequency and phase parameters of the output signal waveform of the anti-electromagnetic interference module and identify the characteristics of the electromagnetic signal.

[0090] The waveform detection module is used for acquiring, detecting, and processing the output signal waveform. Both the electromagnetic interference (EMI) signal detected by the EMI sensor and the output signal waveform of the anti-EMI module detected and output by the waveform detection module need to be acquired simultaneously. For example, if the EMI sensor detects a 100kHz high-frequency pulse and the waveform detection module finds that the LCD drive signal distortion rate is >15%, the next step is triggered: waveform adjustment. When the EMI sensor signal acquisition is strong and the waveform distortion is severe, the operating frequency band needs to be adjusted to avoid the interference signal's frequency band (e.g., the EMI signal is used to determine the interference frequency band).

[0091] Step 3: When it is determined that the waveform signal after passing through the anti-electromagnetic interference module (i.e., the output signal waveform of the anti-electromagnetic interference module detected and output by the waveform detection module) still exceeds the preset waveform change threshold, it is considered that the LCD driver chip is interfered with. Then, the frequency, amplitude, phase and other parameters of the output signal waveform of the anti-electromagnetic interference module are dynamically adjusted. That is, once the output signal waveform of the anti-electromagnetic interference module is found to be abnormal, the MCU will adjust it in time.

[0092] In this invention, a dual protection mechanism is designed in the anti-electromagnetic interference module to protect the circuit and improve the overall anti-electromagnetic interference performance of the LCD. The waveform detection module detects the output signal in real time and adjusts the drive signal waveform in time to eliminate interference when the signal is abnormal, thus ensuring the display quality of the LCD screen.

[0093] In some implementations, step S160, adjusting the drive signal output by the liquid crystal driver chip via the control unit, includes: adjusting the PWM signal and the operating frequency band of the liquid crystal driver chip via the control unit, thereby adjusting the drive signal output by the liquid crystal driver chip so that the parameters of the drive output signal waveform are less than a preset output signal waveform parameter threshold. Here, both the PWM and the operating frequency band need to be adjusted simultaneously. While single-parameter adjustment is possible for waveform adjustment, simultaneous adjustment of both yields better results. For example, adjusting only the PWM signal results in an 88% repair success rate, adjusting only the operating frequency band signal results in an 80% repair success rate, and adjusting both together achieves a 97% repair success rate.

[0094] like Figure 4 As shown, the detection process of the waveform detection module also includes: in step 3, dynamically adjusting the frequency, amplitude, phase, and other parameters of the output signal waveform of the anti-electromagnetic interference module, specifically including:

[0095] Step 31: First, an electromagnetic interference (EMI) sensor is used to detect the EMI signal around the LCD driver chip. This EMI sensor can directly detect the intensity of the EMI signal. Then, a waveform detection module is used to detect the characteristics of the output signal waveform of the EMI suppression module in real time, including parameters such as amplitude, frequency, and phase. The detection of the output signal waveform of the EMI suppression module can be achieved by displaying the waveform in real time on the MCU or by testing the waveform with an oscilloscope.

[0096] Step 32: The MCU determines whether interference has occurred using a preset interference detection algorithm. The MCU pre-programs a threshold for the electromagnetic interference signal strength, as well as characteristic parameters such as the amplitude and frequency of normal waveform changes in the output signal of the anti-electromagnetic interference module, and sets reasonable quality thresholds for the corresponding signals. When the corresponding signal exceeds the set threshold, the MCU determines it as interference.

[0097] Step 33: When it is determined that the waveform signal after passing through the electromagnetic interference suppression module still exceeds the preset waveform change threshold, the frequency, amplitude, phase, and other parameters of the signal waveform are adjusted. This means dynamically adjusting the frequency, amplitude, phase, and other parameters of the output signal waveform of the electromagnetic interference suppression module. For example, adjusting the PWM frequency: if a 100kHz electromagnetic interference signal is detected, the MCU will change the PWM frequency from 500Hz to 600Hz. Adjusting the operating frequency band: for example, if there is 50Hz interference from the power grid when the air conditioner starts, the LCD operating frequency will be adjusted from 60Hz to 55Hz to avoid it.

[0098] Adjustments can be made in ways including, but are not limited to, controlling the voltage amplitude through PWM (Pulse Width Modulation) to improve waveform quality, and fine-tuning the system operating frequency to avoid interference frequency bands. Specifically, the adjustment involves the PWM of the driving waveform signal, and all waveform adjustments are made to the output signal waveform after it has passed through the electromagnetic interference suppression module. The system operating frequency refers to the operating frequency of the LCD driving system.

[0099] In this invention, by real-time detection and adjustment of signal waveforms, the stability of the LCD driving system in a strong electromagnetic interference environment is improved, ensuring display quality and solving the problem of display abnormalities caused by electromagnetic interference in the LCD driving chip. This also enhances the anti-electromagnetic interference capability of the LCD driving chip, extends product lifespan, improves user experience, and increases equipment reliability.

[0100] In some embodiments, the driving method for the liquid crystal display described in this invention further includes: optimizing the driving signal output by the liquid crystal driving chip based on feedback from the display parameters of the liquid crystal display screen.

[0101] The following is combined Figure 7 The diagram shows a flowchart of an embodiment of the method of this utility model that optimizes the driving signal output by the liquid crystal driver chip based on the feedback of the display parameters of the liquid crystal display screen. The specific process of optimizing the driving signal output by the liquid crystal driver chip based on the feedback of the display parameters of the liquid crystal display screen includes: steps S310 to S320.

[0102] Step S310: The waveform detection unit collects the display parameters of the liquid crystal display screen, such as the brightness, contrast, and color saturation of the liquid crystal display screen.

[0103] Step S320: The control unit evaluates the display status of the liquid crystal display screen according to the display parameters of the liquid crystal display screen, and optimizes the driving signal output by the liquid crystal driver chip according to the display status of the liquid crystal display screen.

[0104] The present invention proposes an anti-electromagnetic interference liquid crystal driving system based on waveform detection and its application scheme. The anti-electromagnetic interference module is designed with a dual protection mechanism to protect the circuit and improve the overall anti-electromagnetic interference performance of the liquid crystal display. Through the waveform detection module, the output signal is detected in real time, and the driving signal waveform is adjusted in time to eliminate the interference when the signal is abnormal. In addition, a feedback control mechanism system is introduced to continuously optimize the driving signal and ensure the display quality of the liquid crystal display screen.

[0105] The abnormality of the signal is detected by detecting the output waveform parameters. For example, the peak value of the sampled output voltage is used to set a normal range and an abnormal threshold; exceeding these values ​​indicates a waveform abnormality. Similarly, the actual PWM duty cycle is compared with a set value, with a normal range and an abnormal threshold also set. Parameter detection includes, but is not limited to, the examples above; any abnormality in any set parameter is considered a waveform abnormality.

[0106] like Figure 4 As shown, the detection process of the waveform detection module also includes:

[0107] In step 3, while the frequency, amplitude, phase and other parameters of the output signal waveform of the anti-electromagnetic interference module are dynamically adjusted, a feedback mechanism is introduced into the waveform detection module. This feedback mechanism is used to collect parameters such as the brightness, contrast and color saturation of the LCD screen to evaluate the LCD display status. The evaluated LCD display status is then fed back to the MCU to continuously optimize and adjust the instructions.

[0108] The feedback mechanism refers to feeding back collected parameters such as brightness, contrast, and color saturation of the LCD screen to the MCU. The waveform detection module includes: an electromagnetic interference sensor, and a module for detecting the output signal waveform of the electromagnetic interference suppression module.

[0109] like Figure 4 As shown, the detection process of the waveform detection module also includes: in step 3, evaluating the LCD display status and feeding the status back to the MCU for continuous optimization and adjustment of instructions, specifically including:

[0110] Step 34: Real-time feedback of parameters such as brightness, contrast, and color saturation to assess the LCD condition and optimize adjustment commands. The assessment refers to evaluating the quality of the LCD display. This can be done by setting thresholds for preset backlight brightness, contrast, and other parameters. For example, the current parameter value is checked against a preset threshold range; if the parameter deviates from the threshold, an action is triggered. Figure 4 The process of adjusting the waveform is described in the text. The continuous optimization refers to the feedback of the LCD status to the MCU, which is then executed again. Figure 4 The process is shown below.

[0111] In this invention, the liquid crystal signal waveform is detected and adjusted in real time. The solution combines sensor and waveform data analysis to detect the output signal in real time and introduces a feedback mechanism to provide real-time feedback on the display quality of the liquid crystal display. Thus, by detecting the processed output waveform in real time, adjustments are made promptly; by combining sensor and waveform data analysis, a waveform change threshold is set, and waveform parameters are adjusted promptly when the threshold is exceeded. Furthermore, the feedback mechanism collects information such as the brightness and contrast of the liquid crystal display, providing real-time feedback on the display quality.

[0112] Since the processing and functions implemented by the method in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned liquid crystal display, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0113] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0114] The above description is merely an embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A driving device for a liquid crystal display, characterized in that, The liquid crystal display (LCD) includes a liquid crystal driver chip and a liquid crystal display screen; the driving device for the LCD includes an anti-interference unit; wherein, The liquid crystal driver chip is used to output a driving signal; the driving signal output by the liquid crystal driver chip is a signal used to drive the liquid crystal display screen to display. The anti-interference unit is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen. It is used to receive the driving signal output by the liquid crystal driver chip and perform anti-electromagnetic interference processing on the driving signal output by the liquid crystal driver chip to reduce or even remove the electromagnetic interference signal in the driving signal output by the liquid crystal driver chip, thereby obtaining the anti-electromagnetic interference signal of the driving signal output by the liquid crystal driver chip, which is denoted as the anti-electromagnetic interference driving signal of the liquid crystal driver chip. The liquid crystal display screen is used to receive the anti-electromagnetic interference driving signal from the liquid crystal driver chip and then display based on the anti-electromagnetic interference driving signal from the liquid crystal driver chip.

2. The driving device for a liquid crystal display according to claim 1, characterized in that, The anti-interference unit includes: a first protection module and / or a second protection module; wherein, The anti-interference unit performs electromagnetic interference protection processing on the driving signal output by the liquid crystal driving chip, including: The first protection module is used to perform overvoltage protection processing on the transient voltage signal in the driving signal output by the liquid crystal driver chip; The second protection module is used to release the remaining interference signals in the driving signals output by the liquid crystal driver chip.

3. The driving device for a liquid crystal display according to claim 2, characterized in that, The first protection module includes: a TVS diode module.

4. The driving device for a liquid crystal display according to claim 2, characterized in that, The second protection module includes an RC absorption module; the RC absorption module includes a resistor module and a capacitor module.

5. The driving device for a liquid crystal display according to claim 2, characterized in that, In the case where the anti-interference unit includes a first protection module and a second protection module, and the first protection module includes a TVS diode module and the second protection module includes an RC absorption module, the RC absorption module includes a resistor module and a capacitor module. The output terminal of the liquid crystal driver chip is connected to the cathode of the TVS diode module, and the anode of the TVS diode module is grounded. The cathode of the TVS diode module is also grounded after passing through the resistor module and the capacitor module. The common terminal of the resistor module and the capacitor module is connected to the input terminal of the liquid crystal display screen.

6. The driving device for a liquid crystal display according to claim 2, characterized in that, When the anti-interference unit includes a first protection module and a second protection module, the first protection module and the second protection module are sequentially disposed between the output terminal of the liquid crystal driver chip and the input terminal of the liquid crystal display screen; wherein, The anti-interference unit performs electromagnetic interference protection processing on the driving signal output by the liquid crystal driving chip, specifically including: The first protection module is used to perform overvoltage protection processing on the transient voltage signal in the drive signal output by the liquid crystal driver chip to obtain the first drive protection signal; The second protection module is used to release the remaining interference signals in the first drive protection signal.

7. The driving device for a liquid crystal display according to any one of claims 2 to 6, characterized in that, The anti-interference unit further includes: a filtering module; wherein, The filtering module is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the first protection module; or, the filtering module is disposed between the output terminal of the liquid crystal driver chip and the input terminal of the second protection module. The anti-interference unit, which performs anti-electromagnetic interference processing on the driving signal output by the liquid crystal driving chip, further includes: The filtering module is used to filter out noise signals of a set frequency in the driving signal output by the liquid crystal driving chip to obtain a second driving signal. The first protection module is used to perform overvoltage protection processing on the transient voltage signal in the second drive signal; The second protection module is used to release the remaining interference signal in the second drive signal.

8. The driving device for a liquid crystal display according to claim 7, characterized in that, The filtering module includes: a magnetic bead module; wherein, In the case where the anti-interference unit includes a first protection module, a second protection module, and the filtering module, and the first protection module includes a TVS diode module, and the second protection module includes a resistor module and a capacitor module, the output terminal of the liquid crystal driver chip is connected to the cathode of the TVS diode module after passing through the filtering module, and the anode of the TVS diode module is grounded; the cathode of the TVS diode module is also grounded after passing through the resistor module and the capacitor module; the common terminal of the resistor module and the capacitor module is connected to the input terminal of the liquid crystal display screen.

9. The driving device for a liquid crystal display according to claim 7, characterized in that, Also includes: The system comprises a sensor unit, a waveform detection unit, and a control unit; among which, The sensor unit is disposed on the output side of the anti-interference unit and is used to detect the residual electromagnetic interference signal in the anti-electromagnetic interference driving signal of the liquid crystal driving chip, which is denoted as the residual electromagnetic interference signal of the liquid crystal driving chip. The waveform detection unit is disposed on the output side of the anti-interference unit and is used to detect the waveform of the anti-electromagnetic interference driving signal of the liquid crystal driving chip, which is denoted as the driving output signal waveform of the liquid crystal driving chip. The control unit is further configured to determine whether the anti-electromagnetic interference drive signal of the liquid crystal driver chip is subject to electromagnetic interference by combining the residual electromagnetic interference signal of the liquid crystal driver chip and the drive output signal waveform of the liquid crystal driver chip. If it is determined that the electromagnetic interference suppression drive signal of the liquid crystal driver chip is subject to electromagnetic interference, the drive signal output by the liquid crystal driver chip is adjusted so that the adjusted electromagnetic interference suppression drive signal of the liquid crystal driver chip is not subject to electromagnetic interference.

10. A liquid crystal display, characterized in that, include: The driving device for a liquid crystal display as described in any one of claims 1 to 9.

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