Impedance adjusting circuit, impedance adjusting method and display panel

Abstract

The invention belongs to the technical field of impedance matching, and particularly relates to an impedance adjusting circuit, an impedance adjusting method and a display panel, and the impedance adjusting circuit comprises a sensor module which is used for collecting the temperature and humidity parameters of a signal transmitting end; the reflection detection module is used for detecting the reflection intensity of a reflection signal in the signal transmitting end; the voltage compensation module is used for acquiring matched compensation voltage according to the temperature and humidity parameters and the reflection intensity; the impedance adjusting module is arranged on a transmission line between a signal transmitting end and a signal receiving end and is used for adjusting impedance on the transmission line according to the compensation voltage, so that the reflection intensity is controlled within a preset range; according to the invention, the impedance under different environments and different transmission paths can be adaptively and dynamically adjusted, the signal compensation requirement under an extreme environment is met, and the stability and accuracy of signal transmission are improved.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of impedance matching, and particularly relates to an impedance adjustment circuit, an impedance adjustment method, and a display panel. Background Art

[0002] When a TCON (Timing Controller) in a display device sends a differential signal to a Driver (driver), as the transmission distance increases and the signal rate increases, signal attenuation and increased reflection will occur on the transmission path, causing the signal received at the Driver end to be distorted, and further causing display anomalies.

[0003] Currently, the common solution is mainly to compensate for the distorted signal by using a fixed-parameter compensation method with a pre-emphasis technique at the TCON end; however, in extreme environments such as high temperature and high humidity, the impedance of the transmission path will change significantly, and the traditional fixed-parameter compensation method cannot meet the signal compensation requirements, reducing the stability of signal transmission. Summary of the Invention

[0004] This application provides an impedance adjustment circuit, an impedance adjustment method, and a display panel, which solve the problem that the compensation method with fixed parameters in the related art cannot meet the impedance change of the transmission path in various environments.

[0005] In a first aspect, this application provides an impedance adjustment circuit, which includes: a sensor module, arranged at the signal sending end, for collecting the temperature and humidity parameters of the signal sending end; a reflection detection module, arranged at the signal sending end, for detecting the reflection intensity of the reflection signal in the signal sending end; a voltage compensation module, the voltage compensation module is respectively connected to the sensor module and the reflection detection module, for obtaining a matching compensation voltage according to the temperature and humidity parameters and the reflection intensity; an impedance adjustment module, arranged on the transmission line between the signal sending end and the signal receiving end, the impedance adjustment module is connected to the voltage compensation module, for adjusting the impedance on the transmission line according to the compensation voltage, so that the reflection intensity is controlled within a preset range.

[0006] Optionally, the reflection detection module includes: a directional coupler for separating the signal received by the signal transmitting end into a forward signal and a reflection signal; a mixer, the input end of the mixer is connected to the output end of the directional coupler, for performing frequency conversion on the forward signal and the reflection signal to obtain a forward intermediate frequency signal and a reflection intermediate frequency signal; a digital sampler, the input end of the digital sampler is connected to the output end of the mixer, for performing digital sampling on the forward intermediate frequency signal and the reflection intermediate frequency signal to obtain a forward digital signal and a reflection digital signal; a signal processor, the input end of the signal processor is connected to the output end of the digital sampler, and the output end of the signal processor is connected to the voltage compensation module, for obtaining the reflection intensity of the reflection signal according to the amplitude and phase difference between the forward digital signal and the reflection digital signal.

[0007] Optionally, the voltage compensation module includes: a controller, the controller is respectively connected to the sensor module and the reflection detection module, for obtaining a corresponding parameter sequence by looking up a table according to the temperature and humidity parameters and the reflection intensity; a voltage conversion unit, the voltage conversion unit is connected to the controller, for outputting a corresponding compensation voltage according to the parameter sequence.

[0008] Optionally, the voltage conversion unit includes: a resistor voltage dividing network for outputting a plurality of different preset voltages; a digital decoder, the digital decoder is connected to the controller, for decoding the reference sequence to generate at least two selection signals; a first selector, the selection end of the first selector is connected to the first output end of the digital decoder, and the voltage input end of the first selector is connected to the plurality of output ends of the resistor voltage dividing network, for selecting a corresponding first preset voltage from the resistor voltage dividing network according to the first selection signal output by the digital decoder; a second selector, the selection end of the second selector is connected to the second output end of the digital decoder, and the voltage input end of the second selector is connected to the plurality of output ends of the resistor voltage dividing network, for selecting a corresponding second preset voltage from the resistor voltage dividing network according to the second selection signal output by the digital decoder; a first voltage follower, the positive phase input end of the first voltage follower is connected to the voltage output end of the first selector, and the negative phase input end of the first voltage follower is connected to the output end of the first voltage follower, for stabilizing the voltage of the first preset voltage; a second voltage follower, the positive phase input end of the second voltage follower is connected to the voltage output end of the second selector, and the negative phase input end of the second voltage follower is connected to the output end of the second voltage follower, for stabilizing the voltage of the second preset voltage.

[0009] Optionally, the impedance adjustment module includes: a diode, an anode of the diode is electrically connected to the transmission line, and a cathode of the diode is connected to an output end of the first voltage follower; a transistor, a control end of the transistor is connected to an output end of the second voltage follower, and a first end and a second end of the transistor are connected in series with the transmission line.

[0010] Optionally, the impedance adjustment circuit further includes: a signal collector, disposed at a signal receiving end, for collecting a received signal obtained at the signal receiving end; the controller is further connected to the signal collector, and is further configured to extract a real-time interference value in the received signal, and is further configured to dynamically adjust a swing voltage in the signal sending end according to the real-time interference value.

[0011] Optionally, the controller dynamically adjusts the swing voltage in the signal sending end according to the real-time interference value, including: when the real-time interference value is greater than a preset threshold, the controller sets the swing voltage to a first preset voltage; when the real-time interference value is less than or equal to the preset threshold, the controller sets the swing voltage to a second preset voltage; wherein, the first preset voltage is greater than the second preset voltage.

[0012] Optionally, the controller extracts the real-time interference value in the received signal, including: the controller performs a Fourier transform on the received signal to obtain a frequency domain signal; calculates an amplitude spectrum of the frequency domain signal to obtain an amplitude value of each frequency component; uses the frequency components with amplitude values greater than a preset amplitude as interference frequencies; weights the amplitude values corresponding to all interference frequencies to obtain the real-time interference value in the received signal.

[0013] Optionally, the controller extracts the real-time interference value in the received signal, including: extracting a current swing voltage in the received signal; performing DC filtering on the current swing voltage to obtain an interference signal of the current swing voltage; performing a Fourier transform on the interference signal to extract a main frequency component; performing intensity quantization on the main frequency component to obtain the real-time interference value in the received signal.

[0014] In a second aspect, the present application provides an impedance adjustment method, where the impedance adjustment method includes: obtaining temperature and humidity parameters of a signal sending end and a reflection intensity of a reflected signal; obtaining a compensation voltage that matches according to the temperature and humidity parameters and the reflection intensity; adjusting an impedance on the transmission line according to the compensation voltage so that the reflection intensity is controlled within a preset range.

[0015] Optionally, the impedance adjustment method further includes: obtaining a received signal received at a signal receiving end; extracting a real-time interference value in the received signal; dynamically adjusting a swing voltage in the signal sending end according to the real-time interference value.

[0016] In a third aspect, the present application provides a display panel, including a display area and a non-display area. The display area includes a plurality of scan lines and a plurality of data lines; the non-display area includes: a gate driving circuit electrically connected to the scan lines for outputting a gate driving signal to the scan lines; a data driving circuit electrically connected to the data lines for outputting a data signal to the data lines; a timing controller electrically connected to the data driving circuit through a transmission line for sending a data signal to the data driving circuit; and an impedance adjusting circuit electrically connected to the transmission line for adjusting the impedance of the transmission line.

[0017] The technical solution provided by the present application has at least the following beneficial effects:

[0018] In the present application, by collecting the temperature and humidity parameters of the signal sending end and the reflection intensity of the reflected signal, the voltage compensation module obtains a matching compensation voltage according to the real-time collected temperature and humidity parameters and reflection intensity, so that the impedance adjustment module dynamically adjusts the impedance on the transmission line according to the compensation voltage until the reflection intensity is controlled within a preset range; therefore, the present application can perform adaptive dynamic adjustment of the impedance under different environments and different transmission paths, meet the signal compensation requirements in extreme environments, and improve the stability and accuracy of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 Shown is a schematic structural diagram of an impedance adjusting circuit provided by an embodiment of the present application.

[0021] Figure 2 Shown is a schematic structural diagram of a reflection detection module provided by an embodiment of the present application.

[0022] Figure 3 Shown is a schematic structural diagram of a voltage conversion unit provided by an embodiment of the present application.

[0023] Figure 4 Shown is a schematic structural diagram of an impedance adjustment module provided by an embodiment of the present application.

[0024] Figure 5 Shown is a schematic diagram of a differential signal provided by an embodiment of the present application.

[0025] Figure 6The figure shows a schematic flowchart of an impedance adjustment method provided by an embodiment of the present application.

[0026] Explanation of reference numerals:

[0027] 100, impedance adjustment circuit; 110, sensor module; 120, reflection detection module; 121, directional coupler; 122, mixer; 123, digital sampler; 124, signal processor;

[0028] 130, voltage compensation module; 131, controller; 132, voltage conversion unit; 1321, resistor voltage division network; 1322, digital decoder; 1323, first selector; 1324, second selector; U1, first voltage follower; U2, second voltage follower;

[0029] 200, signal sending end; 300, signal receiving end; 400, transmission line. Detailed implementation manners

[0030] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.

[0031] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0032] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted here that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0033] In a first aspect, the present application provides an impedance adjustment circuit, which specifically includes the following embodiments:

[0034] Figure 1 The figure shows a schematic structural diagram of an impedance adjustment circuit provided by an embodiment of the present application; as Figure 1As shown in the figure, the impedance adjustment circuit 100 includes a sensor module 110, which is arranged at the signal transmission end 200 and is used to collect the temperature and humidity parameters of the signal transmission end 200. Specifically, the signal transmission end 200 in this embodiment can be a TCON end. The sensor module 110 can be a temperature sensor and a humidity sensor, and the sensor module 110 is integrated inside the TCON end and is used to collect the real-time temperature parameter and humidity parameter of the TCON end.

[0035] The impedance adjustment circuit 100 in this embodiment further includes a reflection detection module 120, which is arranged at the signal transmission end 200 and is used to detect the reflection intensity of the reflection signal in the signal transmission end 200. Specifically, the reflection detection module 120 is integrated inside the TCON end. The reflection detection module 120 can include a directional coupler and a logarithmic detector. Among them, the directional coupler is used to extract the transmitted signal inside the signal transmission end 200 and obtain the reflection intensity, and the logarithmic detector is used to convert the reflection intensity into a DC voltage for output.

[0036] The impedance adjustment circuit 100 in this embodiment further includes a voltage compensation module 130. The voltage compensation module 130 is respectively connected to the sensor module 110 and the reflection detection module 120, and is used to obtain a matching compensation voltage according to the temperature and humidity parameters and the reflection intensity. It should be noted that in an environment with the same temperature and humidity, transmission lines 400 of different materials have different reflection intensities; in addition, in environments with different temperatures and humidities, transmission lines 400 of the same material also have different reflection intensities; therefore, the compensation voltage obtained according to the currently collected temperature and humidity parameters and reflection intensity can be compatible with impedance changes in different environments and different transmission paths.

[0037] The impedance adjustment circuit 100 in this embodiment further includes an impedance adjustment module 140, which is arranged on the transmission line 400 between the signal transmission end 200 and the signal reception end 300. The impedance adjustment module 140 is connected to the voltage compensation module 130 and is used to adjust the impedance on the transmission line 400 according to the compensation voltage so that the reflection intensity is controlled within a preset range. The signal reception end 300 in this embodiment can be a Driver end; when the signal sent by the signal transmission end 200 is a single signal, there is 1 transmission line 400 between the signal transmission end 200 and the signal reception end 300; when the signal sent by the signal transmission end 200 is a differential signal, there are two transmission lines 400 between the signal transmission end 200 and the signal reception end 300; in addition, the function of the impedance adjustment module 140 is to cyclically adjust the impedance on the transmission line 400 according to the received compensation voltage until the reflection intensity collected by the reflection detection module 120 reaches within the preset range.

[0038] Therefore, in this application, the temperature and humidity parameters of the signal sending end 200 and the reflection intensity of the reflected signal are collected. The voltage compensation module 130 obtains a matching compensation voltage according to the temperature and humidity parameters and the reflection intensity collected in real time, so that the impedance adjustment module 140 dynamically adjusts the impedance on the transmission line 400 according to the compensation voltage until the reflection intensity is controlled within a preset range. Therefore, this application can adaptively and dynamically adjust the impedance under different environments and different transmission paths, meet the signal compensation requirements in extreme environments, and improve the stability and accuracy of signal transmission.

[0039] In an embodiment, the voltage compensation module 130 includes a controller 131 and a voltage conversion unit 132. The controller 131 is respectively connected to the sensor module 110 and the reflection detection module 120, and is used to obtain a corresponding parameter sequence by looking up a table according to the temperature and humidity parameters and the reflection intensity. The voltage conversion unit 132 is connected to the controller 131 and is used to output a corresponding compensation voltage according to the parameter sequence.

[0040] It should be noted that the controller 131 can be a processing chip with functions such as logical operation, parameter comparison, and data storage. An environmental parameter mapping table can be pre-stored in the controller 131 in advance, as shown in Table 1:

[0041] Table 1. Environmental parameter mapping table

[0042]

[0043]

[0044] It is worth noting that the reason for including two different reflection intensities under the same temperature and humidity parameter in Table 1 is due to the transmission line 400 of different materials. This is only an example here. In actual application scenarios, the compensation voltage of different temperatures and humidities on the transmission line 400 of various materials can be set by combining simulation with measured impedance. Among them, one parameter sequence corresponds to one compensation voltage. For example, 001 can be a compensation voltage corresponding to 2.5V, and 010 can be a compensation voltage corresponding to 2.0V. In this embodiment, the controller 131 outputs a corresponding parameter sequence by querying the pre-stored environmental parameter mapping table according to the currently received temperature and humidity parameters and the reflection intensity, and the voltage conversion unit 132 outputs a corresponding compensation voltage according to the parameter sequence output by the controller 131.

[0045] Figure 2 The following shows a schematic structural diagram of a reflection detection module provided by an embodiment of this application; as Figure 2 shown, the reflection detection module 120 includes a directional coupler 121, a mixer 122, a digital sampler 123, and a signal processor 124.

[0046] In this embodiment, the directional coupler 121 is used to separate the signal received by the signal transmitter into a forward signal and a reflected signal. It should be noted that when a signal encounters impedance mismatch on the transmission line, part of the energy will be reflected back to the source end to form a reflected signal. The core of reflected signal detection is to separate the forward signal sent by the signal transmitter from the reflected signal reflected by the signal receiver. By setting the directional coupler 121 at the signal transmitter, the forward signal and the reflected signal can be separated through electromagnetic coupling.

[0047] In this embodiment, the input end of the mixer 122 is connected to the output end of the directional coupler 121, and is used to perform frequency conversion on the forward signal and the reflected signal to obtain a forward intermediate frequency signal and a reflected intermediate frequency signal. It should be noted that in reflected signal detection, the original signal may be a high-frequency signal (such as 5 GHz). Direct sampling and analysis require a digital sampler 123 and a signal processor 124 with ultra-high bandwidth, which are costly and difficult to implement. Therefore, the core purpose of the mixer 122 is to convert the high-frequency signal into an intermediate frequency signal, thereby reducing the hardware complexity of subsequent processing. The specific process of frequency conversion can be: generating a reference frequency close to the frequency of the forward signal through a local oscillator, generating a forward intermediate frequency signal according to the difference between the forward signal frequency and the reference frequency, and generating a reflected intermediate frequency signal according to the difference between the reflected signal frequency and the reference frequency.

[0048] In this embodiment, the input end of the digital sampler 123 is connected to the output end of the mixer 122, and is used to perform digital sampling on the forward intermediate frequency signal and the reflected intermediate frequency signal to obtain a forward digital signal and a reflected digital signal.

[0049] In this embodiment, the input end of the signal processor 124 is connected to the output end of the digital sampler 123, and is used to obtain the reflection intensity of the reflected signal according to the amplitude and phase difference between the forward digital signal and the reflected digital signal.

[0050] It should be noted that the first amplitude and the first phase of the forward digital signal are respectively extracted through quadrature demodulation, and the second amplitude and the second phase of the reflected digital signal are extracted through quadrature demodulation. The reflection intensity of the reflected signal is calculated according to the ratio of the first amplitude to the second amplitude and the difference between the first phase and the second phase.

[0051] Figure 3 The figure shows a schematic structural diagram of a voltage conversion unit provided by an embodiment of the present application; as Figure 3As shown, the voltage conversion unit 132 includes a resistor voltage division network 1321, a digital decoder 1322, a first selector 1323, a second selector 1324, a first voltage follower U1, and a second voltage follower U2. Among them, the resistor voltage division network 1321 is composed of multiple resistors connected in series, and multiple voltages with different values are output between each resistor, so as to obtain multiple different preset voltages.

[0052] In this embodiment, the digital decoder 1322 is connected to the controller 131 and is used to decode the reference sequence to generate at least two selection signals. Specifically, the digital decoder 1322 is a 74HC138 chip, and three enable terminals of this chip are respectively connected to the controller 131, and are used to receive the multi - base parameter sequence output by the controller 131 and convert the parameter sequence into a selection signal and output it to the next stage.

[0053] In this embodiment, the selection terminal of the first selector 1323 is connected to the first output terminal of the digital decoder 1322, and the voltage input terminals of the first selector 1323 are connected to multiple output terminals of the resistor voltage division network 1321, and are used to select a corresponding first preset voltage from the resistor voltage division network 1321 according to the first selection signal output by the digital decoder 1322. The positive input terminal of the first voltage follower U1 is connected to the voltage output terminal of the first selector 1323, and the negative input terminal of the first voltage follower U1 is connected to the output terminal of the first voltage follower U1, and is used to stabilize the voltage of the first preset voltage.

[0054] It should be noted that the first selector 1323 selects a corresponding first preset voltage for output according to the received first selection signal, and after buffering and stabilizing the first preset voltage through the first voltage follower U1, it outputs it to the impedance - regulating voltage. Therefore, the compensation voltage in this application at least includes the first preset voltage, which is used to adjust the impedance on the transmission line 400.

[0055] In this embodiment, the selection terminal of the second selector 1324 is connected to the second output terminal of the digital decoder 1322, and the voltage input terminals of the second selector 1324 are connected to multiple output terminals of the resistor voltage division network 1321, and are used to select a corresponding second preset voltage from the resistor voltage division network 1321 according to the second selection signal output by the digital decoder 1322. The positive input terminal of the second voltage follower U2 is connected to the voltage output terminal of the second selector 1324, and the negative input terminal of the second voltage follower U2 is connected to the output terminal of the second voltage follower U2, and is used to stabilize the voltage of the second preset voltage.

[0056] It should be noted that the second selector 1324 selects and outputs a corresponding second preset voltage according to the received second selection signal, and buffers and stabilizes the second preset voltage through the second voltage follower U2 and then outputs it to the impedance adjustment voltage; therefore, the compensation voltage in this application at least includes the first preset voltage and the second preset voltage. In addition, the amplitudes and functions of the first preset voltage and the second preset voltage are different. The specific functions of the first preset voltage and the second preset voltage will be introduced in detail in the following embodiments.

[0057] Figure 4 The following shows a schematic structural diagram of an impedance adjustment module provided by an embodiment of this application; as Figure 4 shown, the impedance adjustment module 140 includes: a diode and a transistor. The anode of the diode is electrically connected to the transmission line 400, and the cathode of the diode is connected to the output terminal of the first voltage follower U1; the control terminal of the transistor is connected to the output terminal of the second voltage follower U2, and the first terminal and the second terminal of the transistor are connected in series with the transmission line 400.

[0058] In this embodiment, the impedance adjustment formula for the transmission line 400 is:

[0059]

[0060] In the above formula, Z0 represents the impedance of the transmission line 400, and its physical definition is the inherent impedance of the transmission line 400, which determines the voltage-current ratio relationship during signal propagation; R represents the resistance per unit length, and its physical definition is the resistance of the transmission line 400 per unit length, which is determined by the resistivity of the conductor material; L represents the inductance per unit length, and its physical definition is the inductance of the transmission line 400 per unit length, which is determined by the magnetic field energy storage characteristics generated by the current; G represents the conductance per unit length, and its physical definition is the conductance of the insulating medium per unit length, which reflects the dielectric leakage current, such as the insulation loss of the PCB board material; C represents the capacitance per unit length, and its physical definition is the capacitance of the transmission line 400 per unit length, which is determined by the electric field energy storage characteristics between the transmission lines 400; w represents the angular frequency, w = 2πf, f is the signal frequency, and the angular frequency characterizes the time-varying characteristics of the signal; j represents a constant.

[0061] At high frequencies, R and G can be ignored. Therefore, by dynamically adjusting the equivalent L and C of the transmission line 400, the characteristic impedance Z0 can be changed to match the impedance of the signal sending end 200 or the signal receiving end 300 on the transmission line 400. By connecting a varactor diode in parallel with the transmission line 400, the capacitance value of the transmission line 400 can be changed by adjusting the cathode voltage of the varactor diode; in addition, by connecting the transistor in series with the transmission line 400, by adjusting the gate voltage of the transistor, the channel resistance is changed, which is equivalent to changing the inductance.

[0062] In this embodiment, the voltage input to the cathode of the diode is used as the first preset voltage in the compensation voltage, and the voltage input to the gate of the transistor is used as the second preset voltage in the compensation voltage; when there is only one transmission line 400, the impedance adjustment module 140 may include a diode and a transistor; when there are two transmission lines 400, a diode and a transistor are provided on each transmission line 400; as Figure 4 shown, the cathode voltage A1 of the diode D1 and the cathode voltage A2 of the diode D2 may be the same, that is, both are the first preset voltage, or may be different, which is set according to the actual application scenario; the gate voltage B1 of the transistor M1 and the gate voltage B2 of the transistor M2 may also be the same, that is, both are the second preset voltage, or may be set to be different according to the actual application scenario.

[0063] In another embodiment of the present application, the impedance adjustment circuit further includes: a signal collector, disposed at the signal receiving end, for collecting the received signal obtained by the signal receiving end; the controller is further connected to the signal collector, and is further configured to extract the real-time interference value in the received signal, and is further configured to dynamically adjust the swing voltage in the signal sending end according to the real-time interference value.

[0064] In one embodiment, the controller dynamically adjusts the swing voltage in the signal sending end according to the real-time interference value, including: when the real-time interference value is greater than the preset threshold, the controller sets the swing voltage to the first preset voltage; when the real-time interference value is less than or equal to the preset threshold, the controller sets the swing voltage to the second preset voltage; wherein, the first preset voltage is greater than the second preset voltage.

[0065] It should be noted that the present application can further design to dynamically adjust the swing voltage of the signal sending end on the basis of the above embodiment. The swing voltage refers to the input displacement voltage of the differential signal. As Figure 5 shown, Vdata_P and Vdata_N represent differential signals, and VCM represents the swing voltage. The larger VCM is, the stronger the anti-interference ability of the differential signal is, but the power consumption will be larger; the smaller VCM is, the weaker the anti-interference ability of the differential signal is, and the lower the power consumption is; therefore, by dynamically adjusting the swing voltage according to the real-time interference value extracted from the received waveform at the receiving end, the anti-interference ability of the transmitted signal can be improved and the power consumption can be reduced; the specific adjustment process is: judging whether the interference component of the received signal is higher than the preset threshold, when it is higher than the preset threshold, switching to the high voltage VCM mode; when it is lower than the preset threshold, maintaining the current VCM voltage unchanged; in this embodiment, taking the USIT interface protocol as an example, the first preset voltage may be 0.6V, and the second preset voltage may be 0.45V.

[0066] In one embodiment, the controller extracts the real-time interference value in the received signal, which includes: the controller performs a Fourier transform on the received signal to obtain a frequency-domain signal; calculates the amplitude spectrum of the frequency-domain signal to obtain the amplitude value of each frequency component; takes the frequency components with amplitude values greater than a preset amplitude as interference frequencies; and weights the amplitude values corresponding to all the interference frequencies to obtain the real-time interference value in the received signal.

[0067] It should be noted that the controller applies the Fast Fourier Transform (FFT) to the received signal collected by the signal collector to convert the signal from the time domain to the frequency domain to obtain a frequency-domain signal. Additionally, the frequency-domain signal is a complex number array, and each complex number represents the amplitude and phase information of a frequency component. To obtain the amplitude value of each frequency component, it is necessary to calculate the modulus of each complex number to obtain the amplitude spectrum. The amplitude spectrum can reflect the energy distribution of the signal at different frequencies. Further, according to the sampling frequency and the signal length, the corresponding frequency axis can be determined to determine the actual frequency corresponding to each amplitude value. By observing the amplitude spectrum, the frequency components with amplitudes higher than the preset threshold are found, and these frequency components are regarded as interference signals. Then, the amplitude values corresponding to all the interference signals are averaged to obtain the real-time interference value of the received signal.

[0068] In another embodiment, the controller extracting the real-time interference value in the received signal further includes: extracting the current swing voltage in the received signal; performing DC filtering on the current swing voltage to obtain the interference signal of the current swing voltage; performing a Fourier transform on the interference signal to extract the main frequency component; and performing intensity quantization on the main frequency component to obtain the real-time interference value in the received signal.

[0069] It should be noted that the interference in the differential signals Vdata_P and Vdata_N is mainly manifested as common-mode noise. External interferences (such as power supply ripple, electromagnetic radiation) act on Vdata_P and Vdata_N simultaneously, destroying the signal symmetry. Therefore, in this embodiment, the received differential signal is input into a common-mode voltage extraction circuit to obtain the swing voltage (i.e., the common-mode voltage); the DC component and low-frequency voltage noise in the swing voltage are filtered out by a high-pass filter, and the high-frequency AC interference signal is retained; a hardware accelerator (such as the FPGA built-in FFT IP core) is used to perform a Fourier transform on the interference signal to analyze the main noise frequency in real time and extract the main frequency component; and intensity quantization is performed on the main frequency component to obtain the real-time interference value in the received signal.

[0070] In a second aspect, the present application provides an impedance adjustment method, which specifically includes the following embodiments:

[0071] Figure 6 The following shows a schematic flowchart of an impedance adjustment method provided by an embodiment of the present application, as Figure 6As shown, the impedance adjustment method specifically includes the following steps:

[0072] Step S100: Obtain the temperature and humidity parameters of the signal sending end and the reflection intensity of the reflected signal.

[0073] Step S200: Obtain a matching compensation voltage according to the temperature and humidity parameters and the reflection intensity.

[0074] Step S300: Adjust the impedance on the transmission line according to the compensation voltage so that the reflection intensity is controlled within a preset range.

[0075] In one embodiment, the impedance adjustment method further includes: obtaining the received signal received by the signal receiving end; extracting the real-time interference value in the received signal; dynamically adjusting the swing voltage in the signal sending end according to the real-time interference value.

[0076] It should be noted that the principle of each step of the impedance adjustment method provided in this embodiment is the same as the working process of the above impedance adjustment circuit, and will not be elaborated here.

[0077] In a third aspect, the present application provides a display panel, which includes a display area and a non-display area. The display area includes a plurality of scan lines and a plurality of data lines; the non-display area includes: a gate driving circuit electrically connected to the scan lines for outputting gate driving signals to the scan lines; a data driving circuit electrically connected to the data lines for outputting data signals to the data lines; a timing controller electrically connected to the data driving circuit through a transmission line for sending data signals to the data driving circuit; an impedance adjustment circuit electrically connected to the transmission line for adjusting the impedance of the transmission line.

[0078] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0079] In the description of this specification, the descriptions referring to terms such as "some embodiments" and "exemplarily" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0080] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and the description of the present application shall fall within the scope covered by the patent of the present application.

Claims

1. An impedance adjustment circuit, characterized in that: The impedance adjustment circuit comprises: The sensor module is arranged at the signal sending end and is used to collect the temperature and humidity parameters of the signal sending end; A reflection detection module, arranged at the signal transmitting end, for detecting the reflection intensity of the reflected signal in the signal transmitting end; A voltage compensation module, the voltage compensation module is connected to the sensor module and the reflection detection module respectively, and is used to obtain a matching compensation voltage according to the temperature and humidity parameters and the reflection intensity; An impedance adjustment module is arranged on the transmission line between the signal sending end and the signal receiving end. The impedance adjustment module is connected to the voltage compensation module and is used to adjust the impedance on the transmission line according to the compensation voltage so that the reflection intensity is controlled within a preset range.

2. The impedance adjustment circuit according to claim 1, characterized in that: The reflection detection module comprises: A directional coupler is used to separate the signal received by the signal transmitting end to obtain a forward signal and a reflected signal; A mixer, the input end of which is connected to the output end of the directional coupler, and is used to perform frequency conversion on the forward signal and the reflected signal to obtain a forward intermediate frequency signal and a reflected intermediate frequency signal; A digital sampler, the input end of the digital sampler is connected to the output end of the mixer, and is used to digitally sample the forward intermediate frequency signal and the reflected intermediate frequency signal to obtain a forward digital signal and a reflected digital signal; A signal processor, wherein the input end of the signal processor is connected to the output end of the digital sampler, and the output end of the signal processor is connected to the voltage compensation module, and is used to obtain the reflection intensity of the reflected signal according to the amplitude and phase difference between the forward digital signal and the reflected digital signal.

3. The impedance adjustment circuit according to claim 1, characterized in that: The voltage compensation module comprises: A controller, the controller being connected to the sensor module and the reflection detection module respectively, and being used for obtaining a corresponding parameter sequence by looking up a table according to the temperature and humidity parameters and the reflection intensity; A voltage conversion unit is connected to the controller and is used to output a corresponding compensation voltage according to the parameter sequence.

4. The impedance adjustment circuit according to claim 3, characterized in that: The voltage conversion unit comprises: A resistor voltage divider network is used to output a plurality of different preset voltages; a digital decoder connected to the controller and configured to decode the reference sequence and generate at least two selection signals; a first selector, wherein a selection end of the first selector is connected to a first output end of the digital decoder, and a voltage input end of the first selector is connected to a plurality of output ends of the resistor voltage divider network, and is used to select a corresponding first preset voltage from the resistor voltage divider network according to a first selection signal output by the digital decoder; a second selector, wherein a selection end of the second selector is connected to a second output end of the digital decoder, and a voltage input end of the second selector is connected to a plurality of output ends of the resistor voltage divider network, and is used to select a corresponding second preset voltage from the resistor voltage divider network according to a second selection signal output by the digital decoder; A first voltage follower, wherein a non-phase input terminal of the first voltage follower is connected to a voltage output terminal of the first selector, and an inverting input terminal of the first voltage follower and an output terminal of the first voltage follower are used to stabilize the first preset voltage; A second voltage follower, wherein the non-phase input terminal of the second voltage follower is connected to the voltage output terminal of the second selector, and the inverting input terminal of the second voltage follower and the output terminal of the second voltage follower are used to stabilize the second preset voltage.

5. The impedance adjustment circuit according to claim 4, characterized in that: The impedance adjustment module comprises: a diode, wherein an anode of the diode is electrically connected to the transmission line, and a cathode of the diode is connected to an output end of the first voltage follower; A transistor, wherein a control end of the transistor is connected to an output end of the second voltage follower, and a first end of the transistor and a second end of the transistor are connected in series with the transmission line.

6. The impedance adjustment circuit according to any one of claims 1 to 5, characterized in that: The impedance adjustment circuit further includes: A signal collector is arranged at the signal receiving end and is used to collect the received signal obtained by the signal receiving end; The controller is also connected to the signal collector, and is used to extract the real-time interference value in the received signal, and is used to dynamically adjust the swing voltage in the signal sending end according to the real-time interference value.

7. The impedance adjustment circuit according to claim 6, characterized in that: The controller dynamically adjusts the swing voltage in the signal transmitting end according to the real-time interference value, including: When the real-time interference value is greater than a preset threshold, the controller sets the swing voltage to a first preset voltage; When the real-time interference value is less than or equal to the preset threshold, the controller sets the swing voltage to a second preset voltage; Wherein, the first preset voltage is greater than the second preset voltage.

8. The impedance adjustment circuit according to claim 6, characterized in that: The controller extracting the real-time interference value from the received signal comprises: Extracting a current swing voltage from the received signal; Performing direct current filtering on the current swing voltage to obtain an interference signal of the current swing voltage; Performing Fourier transform on the interference signal to extract the main frequency component; The main frequency component is strength-quantized to obtain a real-time interference value in the received signal.

9. An impedance adjustment method, characterized in that: Applied to the impedance adjustment circuit according to any one of claims 1 to 7, the impedance adjustment method comprises: Obtain the temperature and humidity parameters of the signal sending end and the reflection intensity of the reflected signal; Obtaining a matching compensation voltage according to the temperature and humidity parameters and the reflection intensity; The impedance on the transmission line is adjusted according to the compensation voltage so that the reflection intensity is controlled within a preset range.

10. A display panel, comprising a display area and a non-display area, wherein the display area comprises a plurality of scan lines and a plurality of data lines; characterized in that: The non-display area includes: A gate driving circuit, electrically connected to the scan line, and configured to output a gate driving signal to the scan line; A data driving circuit, electrically connected to the data line, and configured to output a data signal to the data line; A timing controller, electrically connected to the data driving circuit via a transmission line, and configured to send a data signal to the data driving circuit; The impedance adjustment circuit according to any one of claims 1 to 8 is electrically connected to the transmission line and is used to adjust the impedance of the transmission line.

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