Driving circuit, driving method and display apparatus

Abstract

Disclosed in the present application are a driving circuit (100), a driving method and a display apparatus (300). The driving circuit (100) comprises a timing control board (110), a glass substrate (120), a data driver chip (130) and a load regulation module (140), wherein a plurality of traces are disposed on the glass substrate (120), so as to receive a driving signal and a power supply voltage / current signal; the data driver chip (130) receives the driving signal and the power supply voltage / current signal transmitted by the traces, generates a corresponding data signal and outputs same to a data line (210); the load regulation module (140) is disposed on the timing control board (110), and is used for regulating a peak current in the power supply current signal; and when a load change value on a display panel (200) is greater than or equal to a preset value, the load regulation module (140) outputs a corresponding reference current to the traces on the glass substrate (120).

Description

Drive circuit, drive method and display device

[0001] This application claims priority to Chinese Patent Application No. 2024114529601, filed on October 17, 2024, entitled "Drive Circuit, Drive Method and Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, and in particular to a driving circuit, driving method and display device. Background Technology

[0003] As a flat panel display device, TFT-LCD (Thin Film Transistor Liquid Crystal Display) is increasingly used in high-performance display fields due to its small size, low power consumption, no radiation, and relatively low manufacturing cost. When a TFT-LCD is displaying, the grid lines on each row of the display panel are scanned line by line to activate the pixel units connected to that row of grid lines. The data lines output data signals to the activated pixel units to charge them.

[0004] To further reduce the production cost of LCD products, existing circuits used for scanning gate lines often employ a G0A (Gate Driver on Array) design, integrating the TFT (Thin Film Transistor) gate switching circuit onto the array substrate of the display panel to form a scanning drive for the display panel. Glass substrates are used as glass PCBs, but due to the high impedance and lack of capacitors on the glass substrate, the instantaneous load of the power supply voltage is large, affecting the stability of the power supply reference ground, i.e., the 0-level reference voltage GND, and thus affecting the stability of all power supplies and voltages. Summary of the Invention

[0005] The purpose of this application is to provide a drive circuit, drive method, and display device that can improve the power supply system by improving the effect of excessive power supply voltage fluctuations caused by excessive load changes generating peak current.

[0006] This application discloses a driving circuit for driving a display panel. The driving circuit includes a timing control board, a glass substrate, a data driving chip, and a load adjustment module. The timing control board is provided with a timing control chip and a power chip. The timing control chip outputs a driving signal, and the power chip outputs a power supply voltage / current signal. The glass substrate has multiple traces connected to the timing control board to receive the driving signal and the power supply voltage / current signal. The data driving chip is connected to the traces on the glass substrate, receives the driving signal and the power supply voltage / current signal transmitted by the traces, and generates a corresponding data signal to be output to the data line. The load adjustment module is disposed on the timing control board and connected to the power chip, and is used to adjust the peak current in the power supply current signal. When the load change value on the display panel is greater than or equal to a preset value, the load adjustment module outputs a corresponding reference current to the traces on the glass substrate.

[0007] This application also discloses a driving method for driving a circuit to drive a display panel. The driving circuit includes a glass substrate, and the glass substrate is provided with multiple traces that receive driving signals and power supply voltage / current signals.

[0008] The driving method includes:

[0009] Predict the load change values ​​of the data lines within the display panel;

[0010] Based on the comparison between the load change value and the preset value, it is determined whether to input a reference current to the traces on the glass substrate; and

[0011] When the load change value is greater than or equal to the preset value, a reference current is input to the traces of the glass substrate to adjust the spike current in the power supply current signal; when the load change value is less than the preset value, the power supply current pre-input to the traces of the glass substrate is directly output according to the original rules.

[0012] There are multiple reference currents, and different load changes correspond to different reference currents output to the traces on the glass substrate.

[0013] This application also discloses a display device, the display device including a driving circuit and a display panel, the driving circuit being used to drive the display panel, the driving circuit including:

[0014] The timing control board includes a timing control chip and a power supply chip. The timing control chip outputs a drive signal, and the power supply chip outputs a power supply voltage / current signal.

[0015] The glass substrate has multiple traces connected to the timing control board to receive drive signals and power supply voltage / current signals.

[0016] A data driver chip, connected to traces on the glass substrate, receives drive signals and power supply voltage / current signals transmitted through the traces, and generates corresponding data signals to output to the data lines; and

[0017] A load regulation module, located on the timing control board and connected to the power chip, is used to regulate the peak current in the power supply current signal.

[0018] When the load change value on the display panel is greater than or equal to a preset value, the load adjustment module outputs a corresponding reference current to the traces on the glass substrate.

[0019] This application reduces costs by using a glass substrate, and additionally sets up a load adjustment module on the timing control board. The load adjustment module is connected to the power chip and is used to adjust the peak current in the power supply current signal. When the load change value on the display panel is greater than or equal to a preset value, the load adjustment module outputs a corresponding reference current to the traces on the glass substrate. The output magnitude of the reference current is controlled by the load change value to provide an instantaneously stable current, thereby compensating for the instantaneous load withdrawal problem of each voltage source. This solves the problem of large instantaneous current withdrawal during light and heavy load switching, maintains the stability of the power supply and the 0-level reference voltage GND, and avoids excessive fluctuations in power supply current and voltage that could lead to abnormal gamma voltage levels, affecting the display panel. Attached Figure Description

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

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

[0022] Figure 2 is a waveform diagram of the power supply current before and after improvement according to the first embodiment of this application;

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

[0024] Figure 4 is a schematic diagram of the power supply current before and after improvement according to the second embodiment of this application;

[0025] Figure 5 is a schematic diagram of the driving circuit structure of the third embodiment of this application;

[0026] Figure 6 is a schematic diagram of the driving circuit structure of the third embodiment of this application;

[0027] Figure 7 is a schematic flowchart of the driving method according to the fourth embodiment of this application;

[0028] Figure 8 is a schematic flowchart of the driving method according to the fifth embodiment of this application;

[0029] Figure 9 is a schematic flowchart of the driving method of the sixth embodiment of this application;

[0030] Figure 10 is a schematic diagram of the structure of the display device according to the seventh embodiment of this application. Detailed Implementation

[0031] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0032] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0033] Referring to Figure 1, as a first embodiment of this application, a driving circuit 100 is disclosed. The driving circuit 100 is used to drive the display panel 200 to display. The driving circuit 100 includes a timing control board 110, a glass substrate 120, a data driving chip 130, and a load adjustment module 140. The timing control board 110 is provided with a timing control chip 111 and a power chip 112. The timing control chip 111 outputs a driving signal, and the power chip 112 outputs a power supply voltage / current signal. The glass substrate 120 serves as a PCB board, and multiple traces for transmitting driving signals are provided on the glass substrate 120. The data line is connected to the timing control board 110 and receives drive signals and power supply voltage / current signals; the data driver chip 130 is connected to the traces on the glass substrate 120, receives drive signals and power supply voltage / current signals transmitted by the traces, and generates corresponding data signals to output to the data line 210; the load adjustment module 140 is disposed on the timing control board 110 and connected to the power chip 112, and is used to adjust the peak current in the power supply current signal; wherein, when the load change value on the display panel 200 is greater than or equal to a preset value, the load adjustment module 140 outputs the corresponding reference current to the traces on the glass substrate 120.

[0034] In this embodiment, a glass substrate 120 is used as the PCB board. Although this reduces costs, the impedance of the glass is much greater than that of a normal PCB (more than 10 times greater), and there are no capacitors on the glass PCB for voltage regulation and freewheeling. This leads to a series of problems, the most important of which is the stability of the power supply and GND. To ensure the stability of the power supply and GND, a load adjustment module 140 is provided on the timing control board 110. The load adjustment module 140 is connected to the power chip 112 and is used to adjust the power supply current signal. The peak current in the display panel 200; when the load change value on the display panel 200 is greater than or equal to the preset value, the load adjustment module 140 outputs the corresponding reference current to the trace of the glass substrate 120. Referring to Figure 2, because of the existence of the reference current (corresponding to the channel current in the figure), the VAA current required by the power chip 112 is reduced, the peak value of VAA current is reduced, from the original I1 to I2, and from I2 to Iaa2. The corresponding GND voltage is reduced from VGND to VGND2, reducing the difference before and after, so as to reduce the peak value and stabilize GND.

[0035] Referring to Figure 3, as a second embodiment of this application, which is a further refinement of the first embodiment described above, the load adjustment module 140 includes a load switching circuit 150 and a signal control circuit 160. The load switching circuit 150 is disposed on the timing control board 110. The input terminal of the load switching circuit 150 is connected to the power chip 112 to receive the power current signal, and the output terminal is connected to the traces on the glass substrate 120 to output the power current signal to the traces on the glass substrate 120. The control terminal is connected to the signal control circuit 160, which is disposed on the timing control board 110. The signal control circuit 160 controls the on and off of the load switching circuit 150 according to the load change value, so as to control the output of the power current signal of the power chip 112.

[0036] Furthermore, the load switching circuit 150 includes a first control switch T1, a second control switch T2, and a first resistor R1. The input terminal of the first control switch T1 is connected to the power chip 112, and the input terminal of the second control switch T2 is connected to the power chip 112 through the first resistor. The output terminals of the first control switch T1 and the second control switch T2 are connected to the traces on the glass substrate 120. The control terminals of the first control switch T1 and the second control switch T2 are connected to the signal control circuit 160.

[0037] Specifically, when the load change value is greater than or equal to a preset value, the signal control circuit 160 outputs a first control signal to control the first control switch T1 to turn off and the second control switch T2 to turn on. When the load change value is less than the preset value, the signal control circuit 160 outputs a second control signal to control the second control switch T2 to turn off and the first control switch T1 to turn on. The first control switch T1 and the second control switch T2 are a pair of control switches with opposite control signals. Typically, the first control switch T1 is a P-type MOSFET, and the second control switch T2 is an N-type MOSFET. When the control signal is low, the first control switch T1 is on and the second control switch T2 is off; when the control signal is high, the second control switch T2 is on and the first control switch T1 is off.

[0038] On the timing control board 110, a load switching circuit 150 is set up to solve the power supply problem caused by excessive load changes during the switching between light and heavy loads on the panel. For example, within one frame of the display panel 200, there are two spikes in the blanking time. One is caused by the switch from heavy load to light load when entering the blank area, and the other is caused by the switch from light load to heavy load when leaving the blank area and entering the display stage. The signal control circuit 160 controls the switching of T1 / T2 through the output control signal CS. When the display area is normal, T1 is turned on, and the power supply output voltage / current signal is directly given to the data driver chip 130 (Source IC) for normal operation. When the blanking area begins, CS turns on T2 and connects a load resistor, i.e., the first resistor R1, in series between the power supply and the Source IC, so that the load change is not significant in the blanking area. This results in the improved waveform shown in Figure 4, where the voltage of VAA fluctuates only slightly and the current does not change much, achieving a balance in the switching between light and heavy loads. When exiting the blank area, the load increases. To smoothly transition to the display area, CS must be gradually increased, causing T2 to gradually turn off and T1 to gradually turn on. At this time, R1 acts as a current limiter, preventing the voltage from dropping rapidly due to the sudden large flow.

[0039] Referring to Figure 5, as a third embodiment of this application, which is a further refinement of the first embodiment described above, the load regulation module 140 includes a constant current drive chip 170, which is disposed on the timing control board 110. The constant current drive chip 170 includes multiple current output channels 171 and multiple constant current control switches 172. The number of constant current control switches 172 is at least one less than the number of current output channels 171. The constant current drive chip 170 generates control data for the constant current control switches 172 according to the magnitude of the load change value, so as to control the corresponding number of current output channels 171 to output current to the data drive chip 130. The upper limit of the sum of the currents output by all output channels is equal to the maximum differential voltage withstand value of the ground terminal of the power chip 112 divided by the value of the glass resistor.

[0040] Generally, the driving circuit 100 also includes a load detection module 180. The load detection module 180 detects the change in data voltage of pixels 220 on the data line 210 of the display panel 200 within the same frame, or the change in data voltage of the same pixels 220 within different frames, or the change in data voltage between the displayed image and the blanking image within a frame to obtain the load change value. The constant current driving chip 170 obtains the number of control current output channels 171 based on the load change value to control the corresponding number of constant current control switches 172 to be turned on. Generally, if the grayscale changes from large to small, no processing is performed; if it changes from small to large, a control signal is given to the constant current driving chip 170 to provide a constant current at the moment of switching, i.e., a reference current is given to the VAA power supply (other power supplies can operate similarly). The reference current is adjusted based on the difference in gray levels before and after display. The magnitude of the base current for each level can also be adjusted according to the different panel loads. Specifically, if the gray level difference is within 50 gray levels, no processing is performed, and the power chip 112 outputs the power current to the source driver chip normally. If the gray level difference is between 50 and 100 gray levels, the constant current driver chip 170 outputs a reference current of 20mA to the source driver chip. If the gray level difference is between 101 and 150 gray levels, the constant current driver chip 170 outputs a reference current of 40mA to the source driver chip. If the gray level difference is between 151 and 200 gray levels, the constant current driver chip 170 outputs a reference current of 60mA to the source driver chip. If the gray level difference is between 201 and 250 gray levels, the constant current driver chip 170 outputs a reference current of 8mA to the source driver chip.

[0041] Referring to Figure 6, which is a simplified diagram of the control signals in this embodiment, taking 7 current output channels 171 (S1-S7) and 6 constant current control switches 172 as an example, the control signal is a 6-bit data, namely b0, b1, b2, b3, b4 and b5. Each data control signal controls the conduction of the corresponding channel through the corresponding trace. If each channel outputs 20mA, then the 7 channels can provide a total of 140mA of reference current. Using 6-bit data, the opening of channels S2 to S7 is controlled, while channel S1 is always in the open state. At the moment the load is started, the constant current driver chip 170 starts working. At this time, it can be divided into multiple levels according to the size of the back-end load. For example, if the gray level voltage is from 0 to 255, then there are 256 gray levels. So, 256 / 8, the constant current driver chip 170 does not work when gray level is 0 to 32, channel S1 works when gray level is 32 to 64, channels S1 and S2 work when gray level is 64 to 96, channels S1, S2 and S3 work when gray level is 96 to 128, and so on. In this way, different current gradients can be selected according to different load changes, that is, changes in data voltage.

[0042] As shown in Figure 7, as a fourth embodiment of this application, a driving method is disclosed. The driving method is used to drive the driving circuit described in any of the above embodiments. The driving method includes:

[0043] S1: Predicts the load change value of the data lines within the display panel;

[0044] S2: Based on the comparison between the load change value and the preset value, determine whether to input a reference current to the traces on the glass substrate; and

[0045] S3: When the load change value is greater than or equal to the preset value, input a reference current to the traces of the glass substrate to adjust the spike current in the power supply current signal; when the load change value is less than the preset value, output the power supply current pre-input to the traces of the glass substrate according to the original rules.

[0046] There are multiple reference currents, and different load changes correspond to different reference currents output to the traces of the glass substrate 120.

[0047] Referring to Figures 1 and 7, the load change value on the data line 210 within the display panel 200 directly affects the current and voltage signals of the power chip 112, causing the zero-level voltage GND to be inaccurate. This leads to errors in all voltages and currents within the display panel 200, particularly the gamma voltage, resulting in inaccurate data voltages and affecting the normal display of the display panel 200. By predicting the load change value of the data line 210 within the display panel 200 and comparing the load change value with a preset value, it is determined whether to input a reference current to the traces of the glass substrate 120. When the load change value is greater than or equal to the preset value, the corresponding reference current is input to the traces of the glass substrate 120 to adjust the peak current in the power supply current signal and maintain the stability of the power supply and reference ground. The ultimate goal is to maintain the normal operation of the data driver chip 130 and the stability of the display screen, especially in cases where there are no capacitors and the trace resistance and parasitic inductance are large, based on a glass-based PCB platform.

[0048] As shown in Figure 8, this fifth embodiment of the present application is a further refinement and improvement of the fourth embodiment described above. The load change value includes a grayscale change value, the preset value includes a first preset value, and step S1 includes:

[0049] S11: Within the current frame, obtain the grayscale values ​​of the data voltages corresponding to the current row of pixels and the next row of pixels on the current data line in the display panel, calculate the difference, and obtain the grayscale change value; or within the current frame, obtain the grayscale values ​​of the data voltages corresponding to the current data line in the display panel during the display time and the blanking time, calculate the difference, and obtain the grayscale change value.

[0050] Step S3 includes:

[0051] S31: When the grayscale change value is greater than the first preset grayscale value and less than or equal to twice the first preset grayscale value, output one reference current to the traces of the glass substrate; when the grayscale change value is greater than twice the first preset grayscale value and less than three times the first preset grayscale value, output two reference currents to the traces of the glass substrate; when the grayscale change value is greater than three times the first preset grayscale value and less than four times the first preset grayscale value, output three reference currents to the traces of the glass substrate, and so on; when the grayscale change value is less than the first preset grayscale value, directly output the power supply current pre-input to the traces of the glass substrate according to the original rules.

[0052] S32: Generates control data for the constant current control switch based on the magnitude of the load change, so as to control the corresponding number of current output channels to output current to the data driver chip.

[0053] In this embodiment, referring to Figures 1 to 6, different load change values ​​obtained after calculation correspond to different reference currents. The greater the load change, the greater the output reference current. Generally, if the first preset value is set to 50 gray levels, then if the gray level change value is within 50 gray levels, no reference current needs to be output. Instead, the power supply current output by the power chip 112 is used to supply the glass substrate 120, which is then output to the data chip and finally to the data line 210 of the display panel 200. If the gray level change value is within 51-100 gray levels, a constant current of 20mA is output to the data chip and finally to the data line 210 of the display panel 200. If the gray level change value is within 101-150 gray levels, a constant current of 40mA is output to the data chip and finally to the data line 210 of the display panel 200, and so on. Because of the existence of the reference current, the current required by the VAA is reduced, and the peak current of the VAA is reduced, achieving our goal of reducing the peak value and stabilizing GND.

[0054] As shown in Figure 9, this sixth embodiment of the present application is a further refinement and improvement of the fifth embodiment described above. The preset value further includes a second preset value, and step S3 further includes the following steps:

[0055] S31': When the average resistance of the traces on the glass substrate is within a first value range, the grayscale change value is compared with a first preset grayscale value; when the average resistance of the traces on the glass substrate is within a second value range, the grayscale change value is compared with a second preset grayscale value.

[0056] S32': When the grayscale change value is greater than the second preset grayscale value and less than or equal to twice the second preset grayscale value, output twice the reference current to the traces on the glass substrate; when the grayscale change value is greater than twice the second preset grayscale value and less than three times the second preset grayscale value, output four times the reference current to the traces on the glass substrate; when the grayscale change value is greater than three times the second preset grayscale value and less than four times the second preset grayscale value, output six times the reference current to the traces on the glass substrate, and so on; when the grayscale change value is less than the second preset grayscale value, directly output the power supply current pre-input to the traces on the glass substrate according to the original rules.

[0057] S33': Generates control data for the constant current control switch based on the magnitude of the load change, so as to control the corresponding number of current output channels to output current to the data driver chip;

[0058] Wherein, the maximum resistance value in the first value range is 2 to 2.5 times the maximum resistance value in the second value range, the minimum resistance value in the first value range is 1.5 to 2.5 times the minimum resistance value in the second value range, and the first preset value is 1.25 to 2 times the second preset value.

[0059] Referring to FIGS. 1 to 6, considering that there are certain differences in the resistance of different glass substrates 120, in order to make the improved method of the present application applicable, different preset gray scale values are selected for glass substrates 120 with different resistances, and different adjustment methods are adopted. When the average resistance of the traces on the glass substrate 120 is within the first value range, the gray scale change value is compared with the first preset gray scale value; when the average resistance of the traces on the glass substrate 120 is within the second value range, the gray scale change value is compared with the second preset gray scale value. Further, according to the comparison result of the gray scale change value and the second preset gray scale value, control data of the constant current control switch 172 is generated according to the magnitude of the load change value to control the corresponding number of current output channels 171 to output current to the data driving chip 130.

[0060] Generally, the magnitude of the reference current is considered in two aspects. The first is the magnitude of the instantaneous power supply voltage drawdown, and the second is the glass substrate resistance. The magnitude of the instantaneous power supply voltage drawdown depends on the load size of our panel, which is the same for any panel. Once the panel design is determined, it will not be changed. However, because there is no capacitor voltage stabilization on the glass substrate, the instantaneous power supply drawdown current will return to GND, so the magnitude of the instantaneous drawdown current will affect the GND level. For an ideal GND, the resistance at the front and back ends of the trace is almost without error. So even if the current is large, △U = I△R, and the final voltage difference is very small. But because the trace resistance on the glass substrate is very large, so even when the current is small, the voltage difference of △U is also obvious, thus GND loses the 0 level and affects all power supply systems. Therefore, the magnitude of the reference current depends on the load size on the one hand and the glass substrate resistance of GND on the other hand. The maximum voltage difference of the switching convex wave between light and heavy loads cannot exceed the difference between the standard value and the lower limit value of all power supply voltages, so as to ensure that the data driving chip 130 can work normally. Among them, the ground voltage of the power supply chip 112 of the driving circuit 100, that is, the 0 level voltage is GND, the maximum voltage difference tolerance value of GND is △V, the standard value of the power supply voltage is VDD, the lower limit voltage of the power supply voltage is V down, the glass resistance is R, the maximum value of the reference current is I base max, the minimum value of the reference current is I base min, the minimum drawdown current of the power supply is VAA max, the maximum drawdown current of the power supply is VAA min, and the upper limit value of the power supply current is I1.

[0061] Where, △V = VDD - V down;

[0062] I1 = △V / R;

[0063] I base max = VAA max - I1;

[0064] I base min = VAA min - I1.

[0065] Specifically, because the GND voltage difference V equals the resistance R multiplied by the instantaneous current, the maximum withstand voltage difference of the power supply voltage equals the maximum withstand voltage difference of GND, and is also equal to the standard power supply voltage minus the lower limit voltage of the power supply voltage. The upper limit current I1 equals the maximum withstand voltage difference of GND divided by the GND glass resistance. The minimum value of the reference current equals the minimum VAA pump-out current minus the upper limit current I1. The maximum value of the reference current equals the maximum VAA pump-out current minus the upper limit current I1. Thus, the upper and lower limits of the reference current can be determined. However, because our constant current drive chip... The output current of 170 cannot be divided into 255 levels based on 255 gray levels of voltage. Therefore, it can be roughly divided into several levels. For example, from 0 to 50 gray, if the minimum current to VAA is less than the current upper limit of 1, no processing is done. From 50 to 100 gray, the VAA's current to VAA at 100 gray is I1. At this time, the reference current for 50 to 100 gray is the current I2 (I1 is less than I2) that is closest to the output current of the reference circuit output channel. Since the output of the reference current output channel 171 is generally an integer, the closest reference current is selected for compensation.

[0066] As shown in FIG10, as the seventh embodiment of this application, a display device 300 is disclosed. The display device 300 includes a driving circuit 100 and a display panel 200 as described in any of the above embodiments. The driving circuit 100 drives the display panel 200 using the driving method described in the above embodiments.

[0067] Referring to Figures 1 and 10, this application uses a glass substrate 120 as a circuit board for routing traces. Based on the voltage change value of the data line 210 and the resistance value of the traces on the glass substrate 120, the current pre-input to the data line 210 is adjusted. When the grayscale voltage change value is greater than or equal to a preset value, the load adjustment module 140 outputs a corresponding reference current to the traces on the glass substrate 120. The output magnitude of the reference current is controlled by the load change value, providing a momentarily stable current. This avoids excessive voltage difference across the data line 210, which could lead to severe load shedding, affecting the power supply current and GND, and causing abnormal gamma voltage levels. Furthermore, it eliminates the need for additional current-changing circuits or voltage-changing circuits to adjust the power supply voltage, thus compensating for the momentary load shedding of each voltage source. This solves the problem of large instantaneous current shedding during light-to-heavy load switching, maintains the stability of the power supply and GND, and avoids problems caused by excessive current and voltage fluctuations in the power supply, which could lead to abnormal gamma voltage levels.

[0068] It should be noted that the limitations on the steps involved in this solution, without affecting the implementation of the specific solution, are not considered as limiting the order of the steps. That is, the steps listed first can be performed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the protection scope of this application. The inventive concept of this application can form many embodiments, but due to space limitations in the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. The combination of embodiments or technical features will enhance the original technical effect.

[0069] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A driving circuit, the driving circuit being used to drive a display panel to display, wherein, The driving circuit includes: The timing control board includes a timing control chip and a power supply chip. The timing control chip outputs a drive signal, and the power supply chip outputs a power supply voltage / current signal. The glass substrate has multiple traces connected to the timing control board to receive drive signals and power supply voltage / current signals. A data driver chip, connected to traces on the glass substrate, receives drive signals and power supply voltage / current signals transmitted through the traces, and generates corresponding data signals to output to the data lines; and A load regulation module, located on the timing control board and connected to the power chip, is used to regulate the peak current in the power supply current signal. When the load change value on the display panel is greater than or equal to a preset value, the load adjustment module outputs a corresponding reference current to the traces on the glass substrate.

2. The driving circuit as described in claim 1, wherein, The load regulation module includes a load switching circuit and a signal control circuit. The load switching circuit is disposed on the timing control board. The input terminal of the load switching circuit is connected to the power chip to receive the power current signal, and the output terminal is connected to the trace on the glass substrate to output the power current signal to the trace on the glass substrate. The control terminal is connected to the signal control circuit, which is disposed on the timing control board. The signal control circuit controls the on and off of the load switching circuit according to the load change value to control the output of the power current signal of the power chip.

3. The driving circuit as described in claim 2, wherein, The load switching circuit includes a first control switch, a second control switch, and a first resistor. The input terminal of the first control switch is connected to the power chip, and the input terminal of the second control switch is connected to the power chip through the first resistor. The output terminals of the first and second control switches are connected to the traces on the glass substrate, and the control terminals of the first and second control switches are connected to the signal control circuit. Specifically, when the load change value is greater than or equal to a preset value, the signal control circuit outputs a first control signal to turn off the first control switch and turn on the second control switch; when the load change value is less than the preset value, the signal control circuit outputs a second control signal to turn off the second control switch and turn on the first control switch.

4. The driving circuit as described in claim 1, wherein, The load regulation module includes a constant current driver chip, which is mounted on the timing control board. The constant current driver chip includes multiple current output channels and multiple constant current control switches. The number of constant current control switches is at least one less than the number of current output channels. The constant current driver chip generates control data for the constant current control switches based on the magnitude of the load change value, so as to control the corresponding number of current output channels to output current to the data driver chip. The upper limit of the sum of the currents output by all output channels is equal to the maximum differential voltage withstand value of the power chip's ground terminal divided by the value of the glass resistor.

5. The driving circuit as described in claim 4, wherein, The driving circuit also includes a load detection module, which is used to detect the change value of the data voltage of the pixels on the data line of the display panel in the same frame, or the change value of the data voltage of the same pixel in different frames, or the change value of the data voltage between the displayed image and the blanking image in a frame to obtain the load change value. The constant current driving chip obtains the number of control current output channels according to the load change value, so as to control the corresponding number of constant current control switches to be turned on.

6. The driving circuit as described in claim 3, wherein, The first control switch and the second control switch are a set of control switches with opposite control signals. The first control switch includes a P-type MOSFET, and the second control switch includes an N-type MOSFET.

7. The driving circuit as described in claim 5, wherein, When the data voltage changes from large to small, no processing is performed. If the data voltage changes from small to large, a control signal is given to the constant current drive chip to provide a constant reference current at the moment of switching. The reference current is given according to the difference in gray levels before and after display.

8. The driving circuit as described in claim 7, wherein, The voltage difference is a grayscale difference. If the grayscale difference is within 50 grayscale levels, no processing is performed, and the power chip outputs a normal power supply current to the source driver chip. If the grayscale difference is between 50 and 100 grayscale levels, the constant current driver chip outputs a 20mA reference current to the source driver chip. If the grayscale difference is between 101 and 150 grayscale levels, the constant current driver chip outputs a 40mA reference current to the source driver chip. If the grayscale difference is between 151 and 200 grayscale levels, the constant current driver chip outputs a 60mA reference current to the source driver chip. If the grayscale difference is between 201 and 250 grayscale levels, the constant current driver chip outputs an 80mA reference current to the source driver chip.

9. A driving method, wherein, The driving method is used to drive the display panel by the driving circuit. The driving circuit includes a glass substrate, and the glass substrate is provided with multiple traces. The multiple traces receive driving signals and power supply voltage / current signals. The driving method includes: Predict the load change values ​​of the data lines within the display panel; Based on the comparison between the load change value and the preset value, it is determined whether to input a reference current to the traces on the glass substrate; and When the load change value is greater than or equal to the preset value, a reference current is input to the traces of the glass substrate to adjust the spike current in the power supply current signal; when the load change value is less than the preset value, the power supply current pre-input to the traces of the glass substrate is directly output according to the original rules. There are multiple reference currents, and different load changes correspond to different reference currents output to the traces on the glass substrate.

10. The driving method as described in claim 9, wherein, The load change value includes grayscale change value, the preset value includes a first preset value, and the step of predicting the load change value of the data lines in the display panel includes: Within the current frame, obtain the grayscale values ​​of the data voltages corresponding to the current row pixels and the next row pixels on the current data line in the display panel, calculate the difference, and obtain the grayscale change value; or within the current frame, obtain the grayscale values ​​of the data voltages corresponding to the current data line in the display panel during the display time and the blanking time, calculate the difference, and obtain the grayscale change value. The steps of inputting a reference current to the traces of the glass substrate when the load change value is greater than or equal to a preset value, and directly outputting the power supply current pre-input to the traces of the glass substrate according to the original rules when the load change value is less than the preset value include: When the grayscale change value is greater than the first preset grayscale value and less than or equal to twice the first preset grayscale value, a reference current of one unit is output to the traces on the glass substrate. When the grayscale change value is greater than twice the first preset grayscale value and less than three times the first preset grayscale value, a reference current of two units is output to the traces on the glass substrate. When the grayscale change value is greater than three times the first preset grayscale value and less than four times the first preset grayscale value, a reference current of three units is output to the traces on the glass substrate, and so on. When the grayscale change value is less than the first preset grayscale value, the power supply current pre-input to the traces on the glass substrate is directly output according to the original rules. The control data for the constant current control switch is generated based on the magnitude of the load change, so as to control the corresponding number of current output channels to output current to the data driver chip.

11. The driving method as described in claim 10, wherein, The preset value also includes a second preset value. The step of inputting a reference current to the traces of the glass substrate when the load change value is greater than or equal to the preset value to adjust the spike current in the power supply current signal; and directly outputting the power supply current pre-input to the traces of the glass substrate according to the original rules when the load change value is less than the preset value includes the following steps: When the average resistance of the traces on the glass substrate is within a first value range, the grayscale change value is compared with the first preset grayscale value. When the average resistance of the traces on the glass substrate is within the second value range, the grayscale change value is compared with the second preset grayscale value. When the grayscale change value is greater than the second preset grayscale value and less than or equal to twice the second preset grayscale value, twice the reference current is output to the traces of the glass substrate. When the grayscale change value is greater than twice the second preset grayscale value and less than three times the second preset grayscale value, four times the reference current is output to the traces of the glass substrate. When the grayscale change value is greater than three times the second preset grayscale value and less than four times the second preset grayscale value, six times the reference current is output to the traces of the glass substrate, and so on. When the grayscale change value is less than the second preset grayscale value, the power supply current of the pre-input to the glass substrate is directly output according to the original rules. The control data for the constant current control switch is generated based on the magnitude of the load change, so as to control the corresponding number of current output channels to output current to the data driver chip. Wherein, the maximum resistance value in the first value range is 2 to 2.5 times the maximum resistance value in the second value range, the minimum resistance value in the first value range is 1.5 to 2.5 times the minimum resistance value in the second value range, and the first preset value is 1.25 to 2 times the second preset value.

12. The driving method as described in claim 10, wherein, The ground voltage of the power supply chip of the driving circuit is GND, the maximum differential voltage tolerance value of GND is ΔV, the standard value of the power supply voltage is VDD, the lower limit voltage of the power supply voltage is Vlower, the glass resistor is R, the maximum value of the reference current is Ibasemax, the minimum value of the reference current is Ibasemin, the minimum load current of the power supply is VAAmin, the maximum load current of the power supply is VAAmax, and the upper limit value of the power supply current is I1. Where, ΔV = VDD - Vlower; I1 = ΔV / R; Ibasemax = VAAmax - I1; Ibasemin = VAAmin - I1.

13. The driving method as described in claim 9, wherein, The driving circuit includes a load adjustment module. The load adjustment module includes a load switching circuit and a signal control circuit. The load switching circuit is arranged on the timing control board. The input end of the load switching circuit is connected to the power supply chip to receive the power supply current signal. The output end is connected to the trace on the glass substrate to output the power supply current signal to the trace on the glass substrate. The control end is connected to the signal control circuit, and the signal control circuit is arranged on the timing control board. When the load change value is greater than or equal to the preset value, input the reference current to the trace on the glass substrate to adjust the peak current in the power supply current signal. The steps of directly outputting the power supply current pre-input to the trace on the glass substrate according to the original rule when the load change value is less than the preset value include: When the load change value is greater than or equal to the preset value, the signal control circuit controls the load switching circuit to conduct according to the load change value, and inputs the reference current to the trace on the glass substrate to adjust the peak current in the power supply current signal. When the load change value is less than the preset value, the signal control circuit controls the load switching circuit to turn off according to the load change value, and directly outputs the power supply current pre-input to the trace on the glass substrate according to the original rule.

14. The driving method as described in claim 13, wherein, The load switching circuit includes a first control switch, a second control switch and a first resistor. The input end of the first control switch is connected to the power supply chip. The input end of the second control switch is connected to the power supply chip through the first resistor. The output ends of the first control switch and the second control switch are connected to the trace on the glass substrate. The control ends of the first control switch and the second control switch are connected to the signal control circuit. When the load change value is greater than or equal to the preset value, input the reference current to the trace on the glass substrate to adjust the peak current in the power supply current signal. The steps of directly outputting the power supply current pre-input to the trace on the glass substrate according to the original rule when the load change value is less than the preset value include: When the load change value is greater than or equal to the preset value, the signal control circuit outputs a first control signal to control the first control switch to turn off, controls the second control switch to conduct, and inputs the reference current to the trace on the glass substrate to adjust the peak current in the power supply current signal. When the load change value is less than the preset value, the signal control circuit outputs a second control signal to control the second control switch to turn off, controls the first control switch to conduct, and directly outputs the power supply current pre-input to the trace on the glass substrate according to the original rule.

15. The driving method as described in claim 9, wherein, The driving circuit includes a load adjustment module and a load detection module. The load adjustment module includes a constant current driving chip, which is disposed on the timing control board. The constant current driving chip includes multiple current output channels and multiple constant current control switches. The number of constant current control switches is at least one less than the number of current output channels. The load detection module is used to detect the change in data voltage of pixels on the data line of the display panel within the same frame, or the change in data voltage of the same pixel in different frames, or the change in data voltage between the displayed image and the blanking image within a frame to obtain the load change value. When the load change value is greater than or equal to a preset value, a reference current is input to the traces of the glass substrate to adjust the spike current in the power supply current signal. When the load change value is less than the preset value, the steps for directly outputting the power supply current pre-input to the traces of the glass substrate according to the original rules include: When the load change value is greater than or equal to the preset value, the constant current drive chip obtains the number of control current output channels according to the load change value, and controls the corresponding number of constant current control switches to turn on, so as to adjust the peak current in the power supply current signal; when the load change value is less than the preset value, the constant current drive chip obtains the number of control current output channels according to the load change value, and controls the corresponding number of constant current control switches to turn off, and directly outputs the power supply current pre-input to the traces of the glass substrate according to the original rules.

16. A display device, wherein, The display device includes a driving circuit and a display panel. The driving circuit is used to drive the display panel and includes: The timing control board includes a timing control chip and a power supply chip. The timing control chip outputs a drive signal, and the power supply chip outputs a power supply voltage / current signal. The glass substrate has multiple traces connected to the timing control board to receive drive signals and power supply voltage / current signals. A data driver chip, connected to traces on the glass substrate, receives drive signals and power supply voltage / current signals transmitted through the traces, and generates corresponding data signals to output to the data lines; and A load regulation module, located on the timing control board and connected to the power chip, is used to regulate the peak current in the power supply current signal. When the load change value on the display panel is greater than or equal to a preset value, the load adjustment module outputs a corresponding reference current to the traces on the glass substrate.

17. The display device as claimed in claim 16, wherein, The load regulation module includes a load switching circuit and a signal control circuit. The load switching circuit is disposed on the timing control board. The input terminal of the load switching circuit is connected to the power chip to receive the power current signal, and the output terminal is connected to the trace on the glass substrate to output the power current signal to the trace on the glass substrate. The control terminal is connected to the signal control circuit, which is disposed on the timing control board. The signal control circuit controls the on and off of the load switching circuit according to the load change value to control the output of the power current signal of the power chip.

18. The display device as claimed in claim 17, wherein, The load switching circuit includes a first control switch, a second control switch, and a first resistor. The input terminal of the first control switch is connected to the power chip, and the input terminal of the second control switch is connected to the power chip through the first resistor. The output terminals of the first and second control switches are connected to the traces on the glass substrate, and the control terminals of the first and second control switches are connected to the signal control circuit. Specifically, when the load change value is greater than or equal to a preset value, the signal control circuit outputs a first control signal to turn off the first control switch and turn on the second control switch; when the load change value is less than the preset value, the signal control circuit outputs a second control signal to turn off the second control switch and turn on the first control switch; the first control switch and the second control switch are a set of control switches with opposite control signals, the first control switch includes a P-type MOSFET, and the second control switch includes an N-type MOSFET.

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