Driving circuit, driving method and display device

Abstract

The present application discloses a driving circuit, a driving method and a display device, wherein the driving circuit includes a timing control board, a glass substrate, a data driving chip and a load regulating module: a plurality of wirings are arranged on the glass substrate to receive driving signals and power supply voltage / current signals; the data driving chip receives the driving signals and power supply voltage / current signals transmitted by the wirings, and generates corresponding data signals to output to the data lines; the load regulating module is arranged on the timing control board 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 regulating module outputs the corresponding reference current to the wiring of the glass substrate. The present application controls the output size of the reference current through the load change value, provides an instantaneous stable current, thereby compensating for the instantaneous draw problem of each voltage source, so as to solve the problem of large instantaneous current draw during light-heavy load switching, and maintain the stability of the power supply and the 0-level reference voltage GND.

Description

Technical Field

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

[0002] As a flat panel display device, TFT-LCD (Thin Film Transistor Liquid Crystal Display) is increasingly being used in the field of high-performance displays due to its small size, low power consumption, no radiation, and relatively low manufacturing cost. When the TFT-LCD is displaying, each row of gate lines on the display panel is scanned row by row to turn on the pixel units connected to the row of gate lines, and the data lines output data signals to the turned-on pixel units to charge the pixel units.

[0003] In order to further reduce the production cost of liquid crystal display products, the existing circuit for scanning the gate line often adopts the G0A (Gate Driver on Array) design to integrate the TFT (Thin Film Transistor) gate switch circuit on the array substrate of the display panel to form a scanning drive for the display panel; a glass substrate is used as a glass PCB, but the glass substrate has a large impedance and no capacitance, resulting in a large instantaneous load on the power supply voltage, which affects the reference ground of the power supply, that is, the stability of the 0-level reference voltage GND, thereby affecting the stability of all power supplies and voltages. Summary of the invention

[0004] The purpose of the present application is to provide a driving circuit, a driving method and a display device that can improve the problem of excessive power supply voltage fluctuations affecting the power supply system due to peak currents generated by excessive load changes.

[0005] The present application discloses a driving circuit, which is used to drive a display panel to display. 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 voltage / current signal; a plurality of routing lines are provided on the glass substrate, and the plurality of routing lines are connected to the timing control board to receive driving signals and power voltage / current signals; the data driving chip is connected to the routing lines on the glass substrate, receives the driving signals and power voltage / current signals transmitted by the routing lines, and generates corresponding data signals to output to the data lines; the load adjustment module is provided on the timing control board, connected to the power chip, and is used to adjust the peak current in the power current signal; wherein, 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 routing lines of the glass substrate.

[0006] Optionally, the load regulation 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 chip to receive the power current signal, the output end is connected to the wiring on the glass substrate, and the power current signal is output to the wiring of 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. The signal control circuit controls the conduction and shutdown of the load switching circuit according to the load change value to control the output of the power current signal of the power chip.

[0007] Optionally, 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 chip, the input end of the second control switch is connected to the power chip through the first resistor, the output end of the first control switch and the output end of the second control switch are connected to the wiring on the glass substrate, and the control end of the first control switch and the control end of the second control switch are connected to the signal control circuit;

[0008] Among them, 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 be turned off and the second control switch to be turned on; 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 be turned off and the first control switch to be turned on.

[0009] Optionally, the load regulation module includes a constant current driver chip, which is arranged on the timing control board. The constant current driver chip includes multiple current output channels and multiple constant current control switches, the number of the constant current control switches is at least 1 less than the number of the current output channels, and the constant current driver chip generates control data of the constant current control switches according to the size of the load change value to control the corresponding number of current output channels to output current to the data driver chip; wherein the upper limit value of the sum of the currents output by all output channels is equal to the maximum voltage difference withstand value of the ground terminal of the power supply chip divided by the value of the glass resistance.

[0010] Optionally, the driving circuit also includes a load detection module, which is used to detect the change value of the data voltage of a pixel 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 data voltage change value between the display screen and the blanking screen in a frame to obtain a load change value, and the constant current driving chip obtains the number of control current output channels according to the load change value to control the corresponding number of constant current control switches to be turned on.

[0011] The present application also discloses a driving method for driving any of the driving circuits described above, the driving method comprising:

[0012] Predicting load variation values ​​of data lines within a display panel;

[0013] Determining whether to input a reference current to the wiring of the glass substrate according to a comparison result between the load change value and a preset value; and

[0014] When the load change value is greater than or equal to the preset value, a reference current is input to the wiring of 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 power supply current pre-input to the wiring of the glass substrate is directly output according to the original rule;

[0015] There are multiple reference currents, and different load change values ​​correspond to outputting different reference currents to the wiring of the glass substrate.

[0016] Optionally, the load change value includes a grayscale change value, the preset value includes a first preset value, and the step of predicting the load change value of the data line in the display panel includes:

[0017] 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 are obtained in the current frame and calculated to obtain the grayscale change value; or 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 are obtained in the current frame and calculated to obtain the grayscale change value;

[0018] The step of inputting a reference current to the wiring of the glass substrate when the load change value is greater than or equal to a preset value; and directly outputting a power supply current pre-input to the wiring of the glass substrate according to an original rule when the load change value is less than the preset value comprises:

[0019] When the grayscale change value is greater than the first preset grayscale value and is less than or equal to twice the first preset grayscale value, one times the reference current is output to the wiring 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, two times the reference current is output to the wiring 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, three times the reference current is output to the wiring of 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 wiring of the glass substrate is directly output according to the original rule;

[0020] The control data of the constant current control switch is generated according to the magnitude of the load change value, so as to control the corresponding number of current output channels to output current to the data driving chip.

[0021] Optionally, the preset value further includes a second preset value, and when the load change value is greater than or equal to the preset value, the reference current is input to the wiring of 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 power supply current pre-input to the wiring of the glass substrate is directly output according to the original rule, including the steps of:

[0022] When the average resistance of the wiring 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 wiring on the glass substrate is within a second value range, the grayscale change value is compared with a second preset grayscale value;

[0023] When the grayscale change value is greater than the second preset grayscale value and is less than or equal to twice the second preset grayscale value, twice the reference current is output to the wiring of the glass substrate; when the grayscale change value is greater than twice the second preset grayscale value and is less than three times the second preset grayscale value, four times the reference current is output to the wiring of the glass substrate; when the grayscale change value is greater than three times the second preset grayscale value and is less than four times the second preset grayscale value, six times the reference current is output to the wiring of the glass substrate, and so on; when the grayscale change value is less than the second preset grayscale value, the power supply current pre-input to the wiring of the glass substrate is directly output according to the original rule;

[0024] Generate control data of the constant current control switch according to the magnitude of the load change value, so as to control the corresponding number of current output channels to output current to the data drive chip;

[0025] Among them, 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.

[0026] Optionally, the ground voltage of the power chip of the driving circuit is GND, the maximum voltage difference of GND is △V, the standard value of the power supply voltage is VDD, and the lower limit voltage of the power supply voltage is V 下 , the glass resistance is R, and the maximum value of the reference voltage is I 基 max, the minimum value of the reference voltage is I 基 min, the minimum current draw of the power supply is VAAmin, the maximum current draw of the power supply is VAAmin, and the upper limit of the power supply current is I1.

[0027] Where, △V = VDD-V 下；

[0028] I1=△V / R;

[0029] I 基 max=VAAmin-I1;

[0030] I 基 min=VAAmax-I1.

[0031] The present application also discloses a display device, which includes a driving circuit and a display panel as described above, wherein the driving circuit is used to drive the display panel.

[0032] While the present application uses a glass substrate to reduce costs, a load adjustment module is also provided 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 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 wiring of the glass substrate, and controls the output size of the reference current by the load change value to provide an instantaneous stable current, thereby compensating for the instantaneous load draw problem of each voltage source, so as to solve the problem of large instantaneous current draw during light-heavy load switching, maintain the stability of the power supply and the 0-level reference voltage GND, and avoid excessive fluctuations in the power supply current and voltage, resulting in abnormal gamma voltage Gamma level, which affects the display of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 is a schematic diagram of the structure of a driving circuit of the first embodiment of the present application;

[0035] Figure 2 is a waveform diagram of the power supply current before and after improvement of the first embodiment of the present application;

[0036] Figure 3 is a schematic diagram of the structure of a driving circuit of a second embodiment of the present application;

[0037] Figure 4 1 is an intentional waveform of the power supply current before and after improvement of the second embodiment of the present application;

[0038] Figure 5 is a schematic diagram of the structure of a driving circuit of the third embodiment of the present application;

[0039] Figure 6 is a schematic diagram of the structure of a driving circuit of the third embodiment of the present application;

[0040] Figure 7 is a schematic flow chart of a driving method according to a fourth embodiment of the present application;

[0041] Figure 8 is a schematic flow chart of a driving method according to a fifth embodiment of the present application;

[0042] Fig. 9 is a schematic flow chart of a driving method according to a sixth embodiment of the present application;

[0043] Fig.10 It is a schematic structural diagram of a display device of the seventh embodiment of the present application.

[0044] Among them, 100, driving circuit; 110, timing control board; 111, timing control chip; 112, power chip; 120, glass substrate; 130, data driving chip; 140, load adjustment module; 150, load switching circuit; 160, signal control circuit; 170, constant current driving chip; 171, current output channel; 172, constant current control switch; 180, load detection module; 200, display panel; 210, data line; 220, pixel; 300, display device; T1, first control switch; T2, second control switch; R1, first resistor; CS, control signal. DETAILED DESCRIPTION

[0045] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0046] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0047] refer to Figure 1 As shown, as a first embodiment of the present 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 is used as a PCB board, and a plurality of routing lines for transmitting driving signals are arranged on the glass substrate 120, and the plurality of routing lines are connected to the load adjustment module 140. The timing control board 110 is connected to receive the driving signal and the power supply voltage / current signal; the data driving chip 130 is connected to the wiring on the glass substrate 120, receives the driving signal and the power supply voltage / current signal transmitted by the wiring, and generates a corresponding data signal to output to the data line 210; the load adjustment module 140 is arranged on the timing control board 110, 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 the preset value, the load adjustment module 140 outputs the corresponding reference current to the wiring of the glass substrate 120.

[0048] In this embodiment, the glass substrate 120 is used as the PCB board. Although the cost can be reduced, the impedance of the glass is different from the impedance of the original PCB board, which is much greater than the impedance of the normal PCB (more than 10 times), and there is no capacitor on the glass PCB for voltage stabilization and freewheeling, which will lead to a series of problems, the most important of which is the stability of the power supply and GND. In order to ensure the stability of the power supply and GND, a load adjustment module 140 is set on the timing control board 110. The load adjustment module 140 is connected to the power chip 112 and is used to adjust the peak current in the power current signal; 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 wiring of the glass substrate 120, referring to Figure 2Because of the existence of the reference current (corresponding to the channel current in the figure), the VAA current required to be provided by the power chip 112 is reduced, and the VAA current peak 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, thereby achieving the purpose of reducing the peak value and stabilizing GND.

[0049] refer to Figure 3 As shown, as the second embodiment of the present application, it is a further refinement of the above-mentioned first embodiment. The load regulation module 140 includes a load switching circuit 150 and a signal control circuit 160. The load switching circuit 150 is arranged on the timing control board 110. The input end of the load switching circuit 150 is connected to the power chip 112 to receive the power current signal, the output end is connected to the wiring on the glass substrate 120, and the power current signal is output to the wiring of the glass substrate 120. The control end is connected to the signal control circuit 160. The signal control circuit 160 is arranged on the timing control board 110. The signal control circuit 160 controls the conduction and shutdown of the load switching circuit 150 according to the load change value to control the output of the power current signal of the power chip 112.

[0050] Further, the load switching circuit 150 includes a first control switch T1, a second control switch T2 and a first resistor R1, the input end of the first control switch T1 is connected to the power chip 112, the input end of the second control switch T2 is connected to the power chip 112 through the first resistor, the output end of the first control switch T1 and the output end of the second control switch T2 are connected to the wiring on the glass substrate 120, and the control end of the first control switch T1 and the control end of the second control switch T2 are connected to the signal control circuit 160;

[0051] Among them, when the load change value is greater than or equal to the preset value, the signal control circuit 160 outputs the first control signal to control the first control switch T1 to be turned off and the second control switch T2 to be turned on; when the load change value is less than the preset value, the signal control circuit 160 outputs the second control signal to control the second control switch T2 to be turned off and the first control switch T1 to be turned on; the first control switch T1 and the second control switch T2 are a group of opposite control switches, usually the first control switch T1 selects a P-type MOS tube, and the second control switch T2 selects an N-type MOS tube. When the control signal is at a low level, the first control switch T1 is turned on and the second control switch T2 is turned off; when the control signal is at a high level, the second control switch T2 is turned on and the first control switch T1 is turned off.

[0052] A load switching circuit 150 is provided on the timing control board 110 to solve the power supply problem caused by excessive base load change when the panel switches between light and heavy loads. For example, within one frame of the display panel 200, there are two spikes in the blanking time. One is caused by the heavy load switching to light load when just entering the blank area, and the latter is caused by the light load switching to heavy load when leaving the blank area to enter the display stage. The signal control circuit 160 controls the switch of T1 / T2 by outputting the control signal CS. When in the normal display area, T1 is turned on. At this time, the power supply output voltage / current signal is directly given to the data driver chip 130Source IC for normal operation. When the blanking area begins, CS turns on T2 and connects a load resistor, namely the first resistor R1, in series between the power supply and the Source IC, so that the load does not change much in the blanking area. In this way, the following can be obtained: Figure 4 In the improved waveform, the voltage of VAA fluctuates slightly, and the current does not change much, achieving a balance between light and heavy load switching. When leaving the blank area, the load increases. To smoothly transition to the display area, CS can only be gradually increased, so that T2 is gradually closed and T1 is gradually opened. At this time, R1 plays a role of current limiting, so that the entire voltage will not drop rapidly due to the instantaneous large flow.

[0053] refer to Figure 5 As shown, as the third embodiment of the present application, it is a further refinement of the above-mentioned first embodiment, the load regulation module 140 includes a constant current driving chip 170, and the constant current driving chip 170 is arranged on the timing control board 110, and the constant current driving chip 170 includes a plurality of current output channels 171 and a plurality of constant current control switches 172, and the number of the constant current control switches 172 is at least 1 less than the number of the current output channels 171, and the constant current driving chip 170 generates control data of the constant current control switch 172 according to the size of the load change value to control the corresponding number of current output channels 171 to output current to the data driving chip 130; wherein, the upper limit value of the sum of the currents output by all the output channels is equal to the maximum voltage difference withstand value of the ground terminal of the power chip 112 divided by the value of the glass resistance.

[0054] Generally, the driving circuit 100 also includes a load detection module 180, which is used to detect the change value of the data voltage of the pixel 220 in the same frame of the data line 210 on the display panel 200 or the change value of the data voltage of the same pixel 220 in different frames or the data voltage change value between the display screen and the blanking screen in one frame to obtain the load change value. The constant current driving chip 170 obtains the number of control current output channels 171 according to the load change value to control the corresponding number of constant current control switches 172 to be turned on; generally, if the gray scale 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, that is, the reference current is given to the VAA power supply (the other power supplies can also be operated similarly), and the reference current is used as the reference current. The size of the quasi-current is given different reference currents according to the difference in grayscale before and after display, and the size of each level of basic current can also be adjusted according to the different panel loads. Specifically, if the grayscale difference is within 50 grayscales, no processing is done, and the power chip 112 normally outputs the power current to the source driver chip. If the grayscale difference is within 50-100 grays, the constant current driver chip 170 outputs a 20mA reference current to the source driver chip. If the grayscale difference is within 101-150 grays, the constant current driver chip 170 outputs a 40mA reference current to the source driver chip. If the grayscale difference is within 151-200 grays, the constant current driver chip 170 outputs a 60mA reference current to the source driver chip. If the grayscale difference is within 201-250 grays, the constant current driver chip 170 outputs an 8mA reference current to the source driver chip.

[0055] refer to Figure 6 As shown in FIG. 1 , a simplified diagram of the control signal in this embodiment is shown. 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 corresponding channel to be turned on through the corresponding wiring. If the output of each channel is 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, and channel S1 is always in the open state; in the extraction At the moment the load starts, the constant current driver chip 170 starts to work. At this time, according to the size of the back-end load, it can be divided into multiple gears. For example, the grayscale voltage ranges from 0 to 255, which means 256 grayscales, then 256 / 8, then the constant current driver chip 170 does not work at 0 to 32 grayscales, 32 to 64 to channel S1 to work, 64 to 96 to control channel S1 and channel S2 to work, 96 to 128 to control channel S1, channel S2 and channel S3 to work, and so on. In this way, different current gradients can be selected according to different load change values, that is, the change values ​​of the data voltage.

[0056] like Figure 7 As shown, as a fourth embodiment of the present application, a driving method is disclosed, the driving method is used to drive the driving circuit as described in any of the above embodiments, the driving method comprising:

[0057] S1: predict the load change value of the data line in the display panel;

[0058] S2: Determine whether to input a reference current to the wiring of the glass substrate according to a comparison result between the load change value and the preset value; and

[0059] S3: When the load change value is greater than or equal to the preset value, a reference current is input to the wiring of 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 power supply current pre-input to the wiring of the glass substrate is directly output according to the original rule;

[0060] There are multiple reference currents, and different load change values ​​correspond to outputting different reference currents to the wiring of the glass substrate 120 .

[0061] refer to Figure 1 and Figure 7 As shown, because the load change value on the data line 210 in the display panel 200 directly affects the current and voltage signal of the power chip 112, resulting in inaccurate 0-level voltage GND, which in turn causes errors in all voltages and currents in the display panel 200, especially the gamma voltage, resulting in inaccurate data voltage, thereby affecting the normal display of the display panel 200. By predicting the load change value of the data line 210 in the display panel 200; according to the comparison result between the load change value and the preset value, it is determined whether to input a reference current to the wiring 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 wiring of the glass substrate 120 to adjust the peak current in the power current signal and maintain the stability of the power supply and the reference ground. The ultimate purpose is to maintain the normal operation of the data driver chip 130 and the stability of the display screen, especially based on a glass-based PCB platform without capacitors, wiring resistance, and large parasitic inductance.

[0062] like Figure 8 As shown, as the fifth embodiment of the present application, it is a further refinement and improvement of the fourth embodiment, the load change value includes a grayscale change value, the preset value includes a first preset value, and the step S1 includes:

[0063] S11: obtaining 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 in the current frame and calculating the difference to obtain the grayscale change value; or obtaining 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 and calculating the difference to obtain the grayscale change value in the current frame;

[0064] The step S3 comprises:

[0065] S31: when the grayscale change value is greater than the first preset grayscale value and is less than or equal to twice the first preset grayscale value, output one times the reference current to the wiring of the glass substrate; when the grayscale change value is greater than twice the first preset grayscale value and is less than three times the first preset grayscale value, output two times the reference current to the wiring of the glass substrate; when the grayscale change value is greater than three times the first preset grayscale value and is less than four times the first preset grayscale value, output three times the reference current to the wiring 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 wiring of the glass substrate according to the original rule;

[0066] S32: Generate control data of the constant current control switch according to the magnitude of the load change value, so as to control a corresponding number of current output channels to output current to the data driving chip.

[0067] In this embodiment, reference Figures 1 to 6 As shown, different load change values ​​obtained after calculation correspond to different reference current outputs. The greater the load change, the greater the reference current output. Generally, if the first preset value is set to 50 grayscales, then when the grayscale change value is within 50 grayscales, the reference current may not be output, but the power current output by the power chip 112 is used to the glass substrate 120, and then output to the data chip, and finally to the data line 210 of the display panel 200. When the grayscale change value is within 51-100 grayscales, a constant current of 20mA is output to the data chip, and finally to the data line 210 of the display panel 200. When the grayscale change value is within 101-150 grayscales, 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 to be provided by VAA is reduced, and the current peak of VAA is reduced, so as to achieve our purpose of reducing the peak value and stabilizing GND.

[0068] like Fig. 9 As shown, as the sixth embodiment of the present application, it is a further refinement and improvement of the fifth embodiment above, the preset value also includes a second preset value, and the step S3 also includes the following steps:

[0069] S31': when the average resistance of the wiring on the glass substrate is within a first value range, comparing the grayscale change value with a first preset grayscale value; when the average resistance of the wiring on the glass substrate is within a second value range, comparing the grayscale change value with a second preset grayscale value;

[0070] S32': when the grayscale change value is greater than the second preset grayscale value and is less than or equal to twice the second preset grayscale value, output twice the reference current to the wiring of the glass substrate; when the grayscale change value is greater than twice the second preset grayscale value and is less than three times the second preset grayscale value, output four times the reference current to the wiring of the glass substrate; when the grayscale change value is greater than three times the second preset grayscale value and is less than four times the second preset grayscale value, output six times the reference current to the wiring of 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 wiring of the glass substrate according to the original rule;

[0071] S33': Generate control data of the constant current control switch according to the load change value, so as to control a corresponding number of current output channels to output current to the data driving chip;

[0072] Among them, 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.

[0073] refer to Figures 1 to 6 As shown, 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 grayscale values ​​are selected for glass substrates 120 with different resistances, and different adjustment methods are adopted. When the average resistance of the wiring on the glass substrate 120 is within a first value range, the grayscale change value is compared with the first preset grayscale value; when the average resistance of the wiring on the glass substrate 120 is within a second value range, the grayscale change value is compared with the second preset grayscale value. Further, according to the comparison result of the grayscale change value with the second preset grayscale value, the control data of the constant current control switch 172 is generated according to the size of the load change value, so as to control the corresponding number of current output channels 171 to output current to the data driver chip 130.

[0074] Generally, there are two aspects to consider when considering the size of the reference current. The first is the size of the instantaneous draw of the power supply voltage, and the second is the size of the glass base resistance. The size of the instantaneous draw of the power supply voltage depends on the load size of our panel. This is the same for any panel. Once the panel design is finalized, it will not be changed. However, because there is no capacitor on the glass base to stabilize the voltage, the instantaneous draw of the power supply current will return to GND, so the size of the instantaneous draw current will affect the level of GND. For an ideal GND, the resistance of the front and rear ends of the trace is almost zero, so even if the current is large, △U=I△R, and the final voltage difference is very small. However, because the trace resistance of the glass base is large, the voltage difference of △U is also very obvious even if the current is not large, so GND loses the level of 0, which affects all power systems. Therefore, the size of the reference current depends on the size of the load on the one hand, and on the glass base resistance of GND on the other hand. The maximum voltage difference of the convex wave of light and heavy load switching cannot exceed the difference between the standard value of all power supply voltages and the lower limit value, so as to ensure that the data driver 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, and the lower limit voltage of the power supply voltage is V 下 , the glass resistance is R, and the maximum value of the reference voltage is I 基 max, the minimum value of the reference voltage is I 基 min, the minimum current draw of the power supply is VAAmin, the maximum current draw of the power supply is VAAmin, and the upper limit of the power supply current is I1.

[0075] Where, △V = VDD-V 下；

[0076] I1=△V / R;

[0077] I 基 max=VAAmin-I1;

[0078] I 基 min=VAAmax-I1.

[0079] Specifically, because the GND voltage difference V is equal to the resistance R*instantaneous current, the maximum voltage difference of the power supply voltage is equal to the maximum voltage difference of GND, and is also equal to the standard value of the power supply voltage minus the lower limit voltage of the power supply voltage. The upper limit of the current I1 is equal to the maximum voltage difference of GND divided by the GND glass resistance; the minimum value of the reference current is equal to the minimum current of VAA minus the upper limit of the current I1; the maximum value of the reference current is equal to the maximum current of VAA minus the upper limit of the current I1, so the upper and lower limits of the reference current can be determined, but because of our constant current driver chip The current output by 170 cannot be divided into 255 levels according to the 255 grayscale voltages, so it can be roughly divided into several levels. For example, from 0 to 50 gray, if the minimum current drawn by VAA is less than the current upper limit 1, no processing is performed. From 50 to 100 gray, the VAA draws a current of I1 at 100 gray. At this time, the reference current of 50~100 gray is the current I2 (I1 is less than I2) output by the output channel closest to the reference circuit. Because the output of the reference current output channel 171 is generally an integer, the closest reference current is selected for compensation.

[0080] like Fig.10 As shown, as the seventh embodiment of the present application, a display device 300 is disclosed, wherein the display device 300 includes a driving circuit 100 and a display panel 200 as described in any of the above embodiments, and the driving circuit 100 drives the display panel 200 using the driving method in the above embodiments.

[0081] refer to Figure 1 and Fig.10 As shown, the present application uses a glass substrate 120 as a circuit board for laying out the wiring, and adjusts the current pre-input to the data line 210 according to the voltage change value of the data line 210 and the resistance value of the wiring of the glass substrate 120. When the grayscale voltage change value is greater than or equal to the preset value, the load adjustment module 140 outputs the corresponding reference current to the wiring of the glass substrate 120, and controls the output size of the reference current through the load change value, providing an instantaneous stable current, thereby avoiding excessive voltage difference before and after the data line 210, resulting in serious load withdrawal, thereby affecting the size of the power supply current and GND, and causing abnormal gamma voltage level, and there is no need to set up an additional current changing circuit or voltage changing circuit to adjust the power supply voltage, so as to compensate for the instantaneous load withdrawal problem of each voltage source, thereby solving the problem of large instantaneous current draw when switching between light and heavy loads, maintaining the stability of the power supply and GND, and avoiding the problem of excessive current and voltage fluctuation of the power supply, which causes abnormal gamma voltage level.

[0082] It should be noted that the limitations of the various steps involved in this scheme, without affecting the implementation of the specific scheme, are not considered to limit the order of the steps, that is, the steps written in front can be executed first, or can be executed later, or even simultaneously. As long as this scheme can be implemented, it should be considered to belong to the scope of protection of this application. The inventive concept of this application can form a lot of embodiments, but the length of the application document is limited and cannot be listed one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form a new embodiment. After the various embodiments or technical features are combined, the original technical effect will be enhanced.

[0083] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A driving circuit, the driving circuit is used to drive a display panel to display, characterized in that: The driving circuit comprises: A timing control board is provided with a timing control chip and a power chip, wherein the timing control chip outputs a driving signal, and the power chip outputs a power voltage / current signal; A glass substrate is provided with a plurality of wirings, the plurality of wirings are connected to the timing control board, and receive a driving signal and a power supply voltage / current signal; A data driving chip connected to the wiring on the glass substrate, receiving a driving signal and a power supply voltage / current signal transmitted by the wiring, and generating a corresponding data signal to output to the data line; and A load adjustment module, arranged on the timing control board, connected to the power chip, and used for adjusting the peak current in the power 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 wiring of the glass substrate.

2. The driving circuit according to claim 1, characterized in that: The load regulation 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 chip to receive the power current signal. The output end is connected to the wiring on the glass substrate to output the power current signal to the wiring of the glass substrate. The control end is connected to the signal control circuit. The signal control circuit is arranged 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 according to claim 2, characterized in that: 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 chip, the input end of the second control switch is connected to the power chip through the first resistor, the output end of the first control switch and the output end of the second control switch are connected to the wiring on the glass substrate, and the control end of the first control switch and the control end of the second control switch are connected to the signal control circuit; Among them, 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 be turned off and the second control switch to be turned on; 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 be turned off and the first control switch to be turned on.

4. The driving circuit according to claim 1, wherein: The load regulation module includes a constant current drive chip, which is arranged on the timing control board. The constant current drive chip includes a plurality of current output channels and a plurality of constant current control switches. The number of the constant current control switches is at least one less than the number of the current output channels. The constant current drive chip generates control data of the constant current control switches according to the size of the load change value, so as to control the corresponding number of current output channels to output current to the data drive chip; The upper limit of the sum of the currents output by all output channels is equal to the maximum voltage difference withstand value of the ground terminal of the power chip divided by the value of the glass resistance.

5. The driving circuit according to claim 4, characterized in that: The driving circuit also includes a load detection module, which is used to detect the change value of the data voltage of the pixel in the same frame of the data line on the display panel or the change value of the data voltage of the same pixel in different frames or the data voltage change value between the display screen and the blanking screen in one 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 to control the corresponding number of constant current control switches to be turned on.

6. A driving method, characterized in that: Used to drive the driving circuit according to any one of claims 4 to 5, the driving method comprising: Predicting load variation values ​​of data lines within a display panel; Determining whether to input a reference current to the wiring of the glass substrate according to a comparison result between the load change value and a preset value; and When the load change value is greater than or equal to the preset value, a reference current is input to the wiring of 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 power supply current pre-input to the wiring of the glass substrate is directly output according to the original rule; There are multiple reference currents, and different load change values ​​correspond to outputting different reference currents to the wiring of the glass substrate.

7. The driving method according to claim 6, characterized in that: The load change value includes a grayscale change value, the preset value includes a first preset value, and the step of predicting the load change value of the data line in the display panel includes: 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 are obtained in the current frame and calculated to obtain the grayscale change value; or 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 are obtained in the current frame and calculated to obtain the grayscale change value; The step of inputting a reference current to the wiring of the glass substrate when the load change value is greater than or equal to a preset value; and directly outputting a power supply current pre-input to the wiring of the glass substrate according to an original rule when the load change value is less than the preset value comprises: When the grayscale change value is greater than the first preset grayscale value and is less than or equal to twice the first preset grayscale value, one times the reference current is output to the wiring 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, two times the reference current is output to the wiring 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, three times the reference current is output to the wiring of 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 wiring of the glass substrate is directly output according to the original rule; The control data of the constant current control switch is generated according to the magnitude of the load change value, so as to control the corresponding number of current output channels to output current to the data driving chip.

8. The driving method according to claim 7, characterized in that: The preset value further includes a second preset value, and when the load change value is greater than or equal to the preset value, the reference current is input to the wiring of 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 power supply current pre-input to the wiring of the glass substrate is directly output according to the original rule, including the steps of: When the average resistance of the wiring on the glass substrate is within a first value range, comparing the grayscale change value with a first preset grayscale value; When the average resistance of the wiring on the glass substrate is within a second value range, comparing the grayscale change value with a 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 wiring 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 wiring 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 wiring of the glass substrate, and so on; When the grayscale change value is less than the second preset grayscale value, directly outputting the power current pre-input to the wiring of the glass substrate according to the original rule; Generate control data of the constant current control switch according to the magnitude of the load change value, so as to control the corresponding number of current output channels to output current to the data drive chip; Among them, 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.

9. The driving method according to claim 7, characterized in that: The ground voltage of the power chip of the driving circuit is GND, the maximum voltage difference of GND is △V, the standard value of the power supply voltage is VDD, and the lower limit voltage of the power supply voltage is V 下 , the glass resistance is R, and the maximum value of the reference current is I 基 max, the minimum value of the reference current is I 基 min, the minimum current draw of the power supply is VAAmin, the maximum current draw of the power supply is VAAmax, and the upper limit of the power supply current is I1. Where, △V = VDD-V 下； I1=△V / R; I 基 max=VAAmax-I1; I 基 min=VAAmin-I1.

10. A display device, characterized in that: It comprises a driving circuit and a display panel as described in any one of claims 1 to 5, wherein the driving circuit is used to drive the display panel.

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