Driving circuit, driving method and display device

Abstract

The present application discloses a driving circuit, a driving method and a display device. The driving circuit includes a timing control board, a glass substrate, a data driving chip, a load calculation module and a current regulation module. The glass substrate is provided with a plurality of wirings connected to the timing control board to receive driving signals and power supply current signals. The load calculation module is used to detect and calculate the voltage difference of the driving signal within a unit time; the current regulation module includes a plurality of series resistor circuits and a control selector respectively connected in series with the power supply chip. The control selector controls the connection of the corresponding series resistor circuit according to the voltage difference and the resistance of the wiring on the glass substrate to control the peak current value output by the power supply chip. The present application adjusts the size of the peak current by the voltage difference of the driving signal, thereby compensating for the instantaneous draw problem of each voltage source, so as to solve the problem of large instantaneous current draw during the switching between light and heavy loads, and maintain the stability of the power supply and the 0-level reference voltage.

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, a load calculation module and a current regulation 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 current signal; the glass substrate is provided with a plurality of wirings, the plurality of wirings are connected to the timing control board, and receive driving signals and power current signals; the data driving chip is connected to the wirings on the glass substrate, receives the driving signals and power current signals transmitted by the wirings, and generates corresponding data signals and outputs them to the data lines; the load calculation module is used to detect and calculate the voltage difference of the driving signal flowing into the data driving chip within a unit time; the current regulation module is provided on the timing control board and connected to the power chip; wherein the current regulation module includes a plurality of series resistance circuits and a control selector respectively connected in series with the power chip, the control selector controls the connection of the corresponding series resistance circuit according to the voltage difference of the load calculation module and the resistance of the wirings on the glass substrate, so as to control the peak current value output by the power chip.

[0006] Optionally, at least two series resistance circuits are provided, each series resistance circuit is provided with two control switches and a resistor, the resistor in each series resistance circuit is arranged between the two control switches, the control ends of the two control switches are respectively connected to the control selector, and the selection controller outputs different control signals to the two control switches in each series resistance circuit according to the voltage difference calculated by the load calculation module, so as to control the corresponding series resistance circuit to be connected in series to the loop of the power chip and the glass substrate.

[0007] Optionally, the number of series resistance circuits is greater than or equal to four, and the four series resistance circuits are respectively a first series resistance circuit, a second series resistance circuit, a third series resistance circuit and a fourth series resistance circuit; the first series resistance circuit includes a first control switch, a second control switch and a first resistor, the control end of the first control switch receives a first control signal, the input end is connected to a power chip, the output end is connected to the input end of the second control switch through the first resistor, the control end of the second control switch receives a second control signal, and the output end is connected to a wiring on a glass substrate; the second series resistance circuit includes a third control switch, a fourth control switch and a second resistor, the control end of the third control switch receives a first control signal, the input end is connected to a power chip, the output end is connected to the input end of a fourth control switch through the second resistor, the control end of the fourth control switch receives a third control signal, and the output end is connected to a wiring on a glass substrate; the third series resistance circuit includes a fifth control switch, a sixth control switch and a third resistor, the control end of the fifth control switch receives a fourth control signal The fourth series resistor circuit comprises a seventh control switch, an eighth control switch and a fourth resistor, the control end of the seventh control switch receives the fourth control signal, the input end is connected to the power chip, the output end is connected to the input end of the eighth control switch through the fourth resistor, the control end of the eighth control switch receives the third control signal, and the output end is connected to the wiring on the glass substrate; wherein the first control signal and the fourth control signal are a group of inverted control signals, the second control signal and the third control signal are a group of inverted control signals, the first control signal, the second control signal, the third control signal and the fourth control signal control the corresponding control switch to be turned on for 1 / n of the pixel charging time, wherein n is a natural number greater than or equal to 8 and less than or equal to 15; the resistance values ​​of the first resistor, the second resistor, the third resistor and the fourth resistor increase in sequence.

[0008] Optionally, the driving circuit also includes a current regulation auxiliary circuit, which includes a current regulation detection unit, a ninth control switch and a fifth resistor. The current regulation auxiliary circuit is arranged between the series resistance circuit and the wiring of the glass substrate. The control end of the ninth control switch is connected to the current regulation detection unit, the input end is connected to the output end of the series resistance circuit, and the output end is connected to the wiring of the glass substrate. One end of the fifth resistor is connected to the series resistance circuit, and the other end is connected to the wiring of the glass substrate. The current regulation detection unit detects the peak current after adjustment. If the peak current is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs current to the series resistance circuit and the fifth resistor so as to reach the wiring of the glass substrate. The current regulation detection unit detects the peak current after adjustment. If the peak current is less than or equal to the preset value, the ninth control switch is controlled to be turned on, and the power chip outputs current to the series resistance circuit and the ninth control switch so as to reach the wiring of the glass substrate.

[0009] Optionally, the driving circuit further includes a plurality of current regulation auxiliary circuits, each of which is correspondingly arranged between each series resistance circuit and the wiring of the glass substrate, and each of the current regulation auxiliary circuits includes a current regulation detection unit, a ninth control switch and a fifth resistor, and the current regulation auxiliary circuit is arranged between the series resistance circuit and the wiring of the glass substrate, the control end of the ninth control switch is connected to the current regulation detection unit, the input end is connected to the output end of the series resistance circuit, and the output end is connected to the wiring of the glass substrate, one end of the fifth resistor is connected to the series resistance circuit, and the other end is connected to the wiring of the glass substrate; the current regulation detection unit detects the peak value of the adjusted current, and if the peak value of the current is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs the current to the series resistance circuit and the fifth resistor so as to reach the wiring of the glass substrate; the current regulation detection unit detects the peak value of the adjusted current, and if the peak value of the current is less than or equal to the preset value, the ninth control switch is controlled to be turned on, and the power chip outputs the current to the series resistance circuit and the ninth control switch so as to reach the wiring of the glass substrate.

[0010] The present application also discloses a driving method, which is used to drive any of the above driving circuits, wherein the driving circuit comprises a timing control board and a glass substrate, wherein the timing control board is provided with a current regulating module, wherein the current regulating module comprises a plurality of series resistance circuits, and wherein the driving method comprises:

[0011] Detecting and calculating a voltage difference of a driving signal flowing into the data driving chip within a unit time; and

[0012] According to the voltage difference and the resistance of the wiring on the glass substrate, the corresponding series resistance circuit is controlled to be connected in series to the loop of the power chip and the glass substrate to control the peak current value output by the power chip;

[0013] Among them, the resistance values ​​of resistors after being connected to different series resistance circuits are different.

[0014] Optionally, the voltage difference is a grayscale change value, the series resistance circuit is provided with four series resistance circuits, namely a first series resistance circuit, a second series resistance circuit, a third series resistance circuit and a fourth series resistance circuit, the loop resistances of the four series resistance circuits connected in series to the power chip and the glass substrate are respectively a first resistance, a second resistance, a third resistance and a fourth resistance, and the step of controlling the corresponding series resistance circuits to be connected in series to the loop of the power chip and the glass substrate according to the voltage difference and the resistance of the wiring on the glass substrate to control the peak current value output by the power chip comprises:

[0015] When the grayscale change value is less than or equal to the first preset grayscale, the current output by the power chip is not processed;

[0016] When the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, the first series resistance circuit is turned on to connect the first resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, the second series resistance circuit is turned on to connect the second resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, the third series resistance circuit is turned on to connect the third resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, the fourth series resistance circuit is turned on to connect the fourth resistor in series to the loop between the power chip and the glass substrate to adjust the current output by the power chip.

[0017] Optionally, when the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, the first series resistance circuit is turned on to connect the first resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, the second series resistance circuit is turned on to connect the second resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, the third series resistance circuit is turned on to connect the third resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, the fourth series resistance circuit is turned on to connect the fourth resistor in series to the loop between the power chip and the glass substrate to adjust the current output by the power chip, the steps include:

[0018] Generate a corresponding control signal according to the grayscale change value, control the corresponding series resistance circuit to be turned on at the same time when the driving signal changes, and turn off the series resistance circuit within a preset time;

[0019] The preset time is 1 / 15 to 1 / 8 of the pixel charging time.

[0020] Optionally, the driving circuit further includes a current regulation auxiliary circuit, the current regulation auxiliary circuit includes a current regulation detection unit, a ninth control switch and a fifth resistor, when the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, the first series resistor circuit is turned on, and the first resistor is connected in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, the second series resistor circuit is turned on, and the second resistor is connected in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, the third series resistor circuit is turned on, and the third resistor is connected in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, the fourth series resistor circuit is turned on, and the fourth resistor is connected in series to the loop between the power chip and the glass substrate, so as to adjust the current output by the power chip, the following steps are included after the step:

[0021] The adjusted current peak value is detected. If the current peak value is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs current to the series resistor circuit and the fifth resistor to reach the wiring of the glass substrate. If the current peak value is less than or equal to the preset value, the ninth control switch is controlled to be turned on, and the power chip outputs current to the series resistor circuit and the ninth control switch to reach the wiring of the glass substrate.

[0022] 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.

[0023] While the present application uses a glass substrate to reduce costs, a current regulating module is also provided on the timing control board. The current regulating module is connected to the power chip and is used to regulate the peak current in the power current signal. The load calculation module determines the load, such as the voltage difference. If the difference is within the range, no processing is performed. If the difference is large, it means that the instantaneous current will increase. Then the control selector selects the corresponding series resistor circuit connected in series to the wiring loop. The timing of connecting the resistor in series to the loop is selected at the moment of signal switching. At this time, a change will be generated. If the voltage difference per unit time is constant, the peak current needs to be reduced, and the resistance needs to be increased. Therefore, the role of the series resistor circuit is to prevent the instantaneous change of the current from surging sharply, thereby allowing it to rise slowly. When the rise is completed, the series resistor is cancelled and the normal mode is restored to solve the problem of large instantaneous current draw during light and 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, which leads to excessive fluctuations in the power supply voltage, and then causes abnormal gamma voltage Gamma level, affecting the display of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 is a schematic diagram of the structure of a driving circuit of the first embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of a current regulation module according to a second embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a control signal waveform of the second embodiment of the present application;

[0028] Figure 4 1 is an intentional waveform of the power supply current before and after improvement of the second embodiment of the present application;

[0029] Figure 5 is a schematic diagram of the structure of a driving circuit of the third embodiment of the present application;

[0030] Figure 6 is a schematic diagram of the structure of a driving circuit of a fourth embodiment of the present application;

[0031] Figure 7 is a schematic flow chart of a driving method according to a fifth embodiment of the present application;

[0032] Figure 8 is a schematic flow chart of a driving method according to a sixth embodiment of the present application;

[0033] Fig. 9 is a schematic flow chart of a driving method according to a seventh embodiment of the present application;

[0034] Fig.10 It is a schematic structural diagram of a display device of the eighth embodiment of the present application.

[0035] 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 calculation module; 150, current regulation module; 160, series resistance circuit; 161, first series resistance circuit; 162, second series resistance circuit; 163, third series resistance circuit; 164, fourth series resistance circuit; 170, control selector; 180, current regulation auxiliary circuit; 181, current regulation detection unit; 200, display Panel; 210, data line; 300, display device; T1, first control switch; T2, second control switch; T3, third control switch; T4, fourth control switch; T5, fifth control switch; T6, sixth control switch; T7, seventh control switch; T8, eighth control switch; T9, ninth control switch; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; S1, first control signal; S2, second control signal; S3, third control signal; S4, fourth control signal. DETAILED DESCRIPTION

[0036] 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.

[0037] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0038] refer to Figure 1As 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, and the driving circuit 100 includes a timing control board 110, a glass substrate 120, a data driving chip 130, a load calculation module 140 and a current regulation module 150: 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 current signal; the glass substrate 120 is provided with a plurality of wirings, the plurality of wirings are connected to the timing control board 110, and receive the driving signal and the power current signal; the data driving chip 130 is connected to the wirings on the glass substrate 120, and receives the wirings The load calculation module 140 is used to detect and calculate the voltage difference of the drive signal flowing into the data driver chip 130 within a unit time; the current regulation module 150 is arranged on the timing control board 110 and connected to the power chip 112; wherein, the current regulation module 150 includes a plurality of series resistance circuits 160 and a control selector 170 respectively connected in series with the power chip 112, and the control selector 170 controls the connection of the corresponding series resistance circuit 160 according to the voltage difference of the load calculation module 140 and the resistance of the wiring on the glass substrate 120, so as to control the peak current value output by the power chip 112.

[0039] 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 current regulating module 150 is set on the timing control board 110. The current regulating module 150 is connected to the power chip 112 and is used to regulate the peak current in the power supply current signal; the load calculation module 140 determines the load, such as the voltage difference. If the difference is within the range, no processing is performed. If the difference is large, it means that the instantaneous current will increase, and the control selector 170 selects the corresponding series resistor circuit 160 connected in series into the wiring loop. The timing of the resistor entering the loop is selected at the moment of signal switching. At this time, a change will be generated. If the voltage difference per unit time is constant, to reduce the peak current, it is necessary to increase the resistance. Therefore, the role of the series resistor circuit 160 is to prevent the instantaneous change of current from surging, so that it rises slowly. When it rises, the series resistor is cancelled and the normal mode is restored to solve the problem of large instantaneous current draw during light and heavy load switching, maintain the stability of the power supply and the 0-level reference voltage GND, and avoid excessive power supply voltage fluctuations due to excessive power supply current fluctuations.

[0040] Because the current is given to the display panel 200, it is actually a process of charging the display panel 200. Then in the circuit, when the capacitor is charged, the change in charge is proportional to time. According to the definition of current (I= dQ / dt), the calculation formula of capacitance can be derived. Let the potential difference between the two plates of the capacitor be V, the charge be Q, the time be t, and the charge of the capacitor at the beginning of charging be t. Then I=dQ / dt= Q / t. According to the definition of capacitance and charge C=Q / V, it can be concluded that I=dQ / dt=C(dV / dt)=CV / t, V=It / C. Among them, C represents capacitance, the unit is farad (F), Q represents the charge stored in the capacitor, the unit is coulomb (C), and V represents the potential difference between the two plates of the capacitor, the unit is volt (V).

[0041] From the above formula, we can know that the smaller the charging current, the smaller the instantaneous voltage V will be. Because the power required for each sub-pixel to display the corresponding grayscale is fixed, the power required for the entire panel display is P (which can be obtained through software simulation), then P=I²R, the larger the resistance, the smaller the current, the current Imax²=P / (wiring resistance + load resistance), Imax is the maximum current provided to the load for charging instantly, this current is limited by the load resistance and wiring resistance, so the role of the series resistor is to limit the instantaneous current and slow down the speed of charging / discharging, so that the instantaneous voltage high / low point will not exceed our specifications.

[0042] Because the total panel power required for different grayscales and screen displays is different, Imax2=Ptotal / (R surface+R glass+R string), and for load switching, Ptotal=the power difference between the previous grayscale and the next grayscale, because the resistance value (R surface) of the display panel 200 and the glass-based wiring impedance value (R glass) can be obtained through simulation at the initial design stage, different series impedance values ​​can be obtained according to different grayscale voltage powers, but since the selection of resistor R string in the series resistor circuit 160 is limited, it is not possible to design a resistance value for each grayscale, and it can be divided into ranges. For example, the maximum power is when all sub-pixels are 255 grayscale, and the minimum power is when all grayscales are 0 gray, then the range is P0~P255, and the differences in different grayscales are adjusted separately through the classified series resistors.

[0043] refer to Figure 2As shown, as the second embodiment of the present application, it is a further refinement of the above-mentioned first embodiment. The series resistance circuit 160 is provided with at least two, each series resistance circuit 160 is provided with two control switches and one resistor, the resistor in each series resistance circuit 160 is arranged between the two control switches, and the control ends of the two control switches are respectively connected to the control selector 170, and the selection controller outputs different control signals to the two control switches in each series resistance circuit 160 according to the voltage difference calculated by the load calculation module 140, so as to control the corresponding series resistance circuit 160 to be connected in series to the loop of the power chip 112 and the glass substrate 120.

[0044] Intervention is carried out at the source of the generation. For the display panel 200, the change from light load to heavy load or from heavy load to light load is caused by the sudden change of the data voltage in the driving signal. The wiring resistance and the rear-end load on the glass substrate 120 are constant. The greater the voltage difference that changes in unit time, the greater the current. To solve this problem, firstly, the load calculation module 140 calculates the difference in load loading. If the difference is within the range, no processing is performed. If the difference is large, it means that the instantaneous current will increase. Then the control selector 170 outputs a control signal to select the series resistance circuit 160, and selects the resistance that is connected in series to the wiring loop under different conditions; the timing of the resistance being connected in series to the loop is selected at the moment of signal switching. At this time, a change will be generated. If the voltage difference per unit time is constant, the peak current needs to be reduced, so the resistance needs to be increased. Therefore, the role of the series resistance is to prevent the instantaneous change of the current from increasing sharply, so that the current output by the power supply rises slowly. When the rise is completed, the series resistance is cancelled and the normal mode is restored.

[0045] Furthermore, the number of the series resistance circuits 160 is greater than or equal to four, and generally four are provided. Taking four as an example, the four series resistance circuits 160 are respectively a first series resistance circuit 161, a second series resistance circuit 162, a third series resistance circuit 163 and a fourth series resistance circuit 164; the first series resistance circuit 161 includes a first control switch T1, a second control switch T2 and a first resistor R1, the control end of the first control switch T1 receives a first control signal S1, the input end is connected to the power chip 112, and the output end is connected to the input end of the second control switch T2 through the first resistor R1, the control end of the second control switch T2 receives a second control signal S2, and the output end is connected to the wiring on the glass substrate 120; the second series resistance circuit 162 includes a third control switch T3, a fourth control switch T4 and a second resistor R2, the control end of the third control switch T3 receives the first control signal S1, the input end is connected to the power chip 112, and the output end is connected to the input end of the fourth control switch T4 through the second resistor R2, and the fourth control switch T The control end of the fifth control switch T5 receives the third control signal S3, and the output end is connected to the wiring on the glass substrate 120; the third series resistance circuit 163 includes a fifth control switch T5, a sixth control switch T6 and a third resistor R3, the control end of the fifth control switch T5 receives the fourth control signal S4, the input end is connected to the power chip 112, and the output end is connected to the input end of the sixth control switch T6 through the third resistor R3, the control end of the sixth control switch T6 receives the second control signal S2, and the output end is connected to the wiring on the glass substrate 120; the fourth series resistance circuit 164 includes a seventh control switch T7, an eighth control switch T8 and a fourth resistor R4, the control end of the seventh control switch T7 receives the fourth control signal S4, the input end is connected to the power chip 112, the output end is connected to the input end of the eighth control switch T8 through the fourth resistor R4, the control end of the eighth control switch T8 receives the third control signal S3, and the output end is connected to the wiring on the glass substrate 120; the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 increase in sequence.

[0046] refer to Figures 2 to 4 As shown, the first control signal S1 and the fourth control signal S4 are a group of inverted control signals, the second control signal S2 and the third control signal S3 are a group of inverted control signals, the first control signal S1, the second control signal S2, the third control signal S3 and the fourth control signal S4 control the corresponding control switch to be turned on for a duration of 1 / n of the pixel charging time, wherein n is a natural number greater than or equal to 8 and less than or equal to 15; the bit data corresponding to the control signal can be referred to Figure 3As shown in the figure, when the charging time is constant, it is only necessary to change the current size in part of the time. If the voltage difference per unit time is constant, to reduce the peak current, it is necessary to increase the resistance. Therefore, the role of the series resistor is to prevent the instantaneous change of current from increasing sharply (such as Figure 4 ), so that it rises slowly. When it finishes rising, the series resistance is removed and the normal mode is restored. If it is connected in series all the time, the power consumption of the whole circuit will be increased. If it is only for a moment, the increased power consumption can be ignored. The time of series connection can be referred to Figure 3 At the moment of switching, when the grayscale is low, the 2-bit control is 0101, and R1 is selected to be connected in series to the circuit. When the grayscale is increased, 0110 is selected, and R2 is selected to be connected in series to the circuit. This method is applicable whether it is from low grayscale to high grayscale, or from high grayscale to low grayscale.

[0047] Usually, the voltage difference is reflected by the grayscale value. If the grayscale difference is within 20 grayscales, the current output by the power chip 112 is not processed; if the grayscale difference is within 21 grayscales to 100 grayscales, the first series resistor circuit 161 is connected, and the first control signal S1 and the second control signal S2 control the first control switch T1 and the second control switch T2 to be turned on. The current output by the power chip 112 is changed after passing through the first resistor R1 to be output to the wiring of the glass substrate 120, and finally input to the display panel 200. If the grayscale difference is within 101 grayscales to 150 grayscales, the second series resistor circuit 162 is connected, and the first control signal S1 and the third control signal S3 control the third control switch T3 and the fourth control switch T4 to be turned on. The current output by the power chip 112 is changed after passing through the second resistor R2 to be output to the wiring of the glass substrate 120, and finally input to the display panel 20 0, if the grayscale difference is within the range of 151 grayscale to 200 grayscale, the third series resistor circuit 163 is connected, the second control signal S2 and the fourth control signal S4 control the fifth control switch T5 and the sixth control switch T6 to be turned on, and the current output by the power chip 112 is changed after passing through the third resistor R3 to be output to the wiring of the glass substrate 120, and finally input to the display panel 200. If the grayscale difference is within the range of 201 grayscale to 250 grayscale, the fourth series resistor circuit 164 is connected, the third control signal S3 and the fourth control signal S4 control the seventh control switch T7 and the eighth control switch T8 to be turned on, and the current output by the power chip 112 is changed after passing through the fourth resistor R4 to be output to the wiring of the glass substrate 120, and finally input to the display panel 200. According to the load size fed back by the display panel 200, the size of the resistor in the series circuit resistor and the grayscale range value can be adjusted.

[0048] refer to Figure 5As shown, as the third embodiment of the present application, it is a further refinement of the above second embodiment, the driving circuit 100 also includes a current regulation auxiliary circuit 180, the current regulation auxiliary circuit 180 includes a current regulation detection unit 181, a ninth control switch T9 and a fifth resistor R5, the current regulation auxiliary circuit 180 is arranged between the series resistance circuit 160 and the wiring of the glass substrate 120, the control end of the ninth control switch T9 is connected to the current regulation detection unit 181, the input end is connected to the output end of the series resistance circuit 160, and the output end is connected to the wiring of the glass substrate 120, and one end of the fifth resistor R5 is connected to the series resistance circuit 160, and the other end is connected to the wiring of the glass substrate 120;

[0049] The current regulation detection unit 181 detects the peak value of the adjusted current. If the peak value of the current is greater than a preset value, the ninth control switch T9 is controlled to be disconnected, and the power chip 112 outputs current to the series resistor circuit 160 and the fifth resistor R5 to reach the wiring of the glass substrate 120. The current regulation detection unit 181 detects the peak value of the adjusted current. If the peak value of the current is less than or equal to the preset value, the ninth control switch T9 is controlled to be turned on, and the power chip 112 outputs current to the series resistor circuit 160 and the ninth control switch T9 to reach the wiring of the glass substrate 120.

[0050] This embodiment adds a current regulation detection unit 181. After the adjustment in the above embodiment is completed, further detection can be performed to determine whether the adjusted current meets the requirements. If the adjusted current peak is still large, further adjustment is required by connecting it in series with a resistor again, namely the fifth resistor R5, to further adjust the peak current.

[0051] refer to Figure 6As shown, as the fourth embodiment of the present application, it is a further refinement of the above-mentioned second embodiment. Different from the above-mentioned third embodiment, the driving circuit 100 also includes a plurality of current regulation auxiliary circuits 180, each of which is correspondingly arranged between each series resistance circuit 160 and the wiring of the glass substrate 120, each of which includes a current regulation detection unit 181, a ninth control switch T9 and a fifth resistor R5, and the current regulation auxiliary circuit 180 is arranged between the wiring of the series resistance circuit 160 and the glass substrate 120, the control end of the ninth control switch T9 is connected to the current regulation detection unit 181, the input end is connected to the output end of the series resistance circuit 160, and the output The fifth resistor R5 has one end connected to the wiring of the glass substrate 120, one end of the fifth resistor R5 is connected to the series resistor circuit 160, and the other end is connected to the wiring of the glass substrate 120; the current regulation detection unit 181 detects the peak current after regulation, and if the peak current is greater than the preset value, the ninth control switch T9 is controlled to be disconnected, and the power chip 112 outputs the current to the series resistor circuit 160 and the fifth resistor R5 so as to reach the wiring of the glass substrate 120; the current regulation detection unit 181 detects the peak current after regulation, and if the peak current is less than or equal to the preset value, the ninth control switch T9 is controlled to be turned on, and the power chip 112 outputs the current to the series resistor circuit 160 and the ninth control switch T9 so as to reach the wiring of the glass substrate 120.

[0052] In this embodiment, a current regulation auxiliary circuit 180 is provided after each series resistance circuit 160. The current regulation auxiliary circuit 180 can adjust the current in combination with the series resistance circuit 160. For example, when the grayscale difference is within the range of 20 to 100 grayscales, assuming that the grayscale difference is 30, the first resistor R1 is selected to be connected, and the adjusted current meets the requirements. However, when the grayscale difference is 90, if the first resistor R1 is still selected to be connected, the adjusted current may be higher than the ideal current. At this time, the fifth resistor R5 can be connected, that is, the first resistor R1 and the fifth resistor R5 are connected in series in the loop, so as to further reduce the current, so that the adjusted current meets the requirements and is close to the ideal current.

[0053] like Figure 7 As shown, as a fifth 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 circuit includes a timing control board and a glass substrate, the timing control board is provided with a current regulating module, the current regulating module includes a plurality of series resistance circuits, the driving method includes:

[0054] S1: Detect and calculate the voltage difference of the driving signal flowing into the data driving chip within a unit time; and

[0055] S2: According to the voltage difference and the resistance of the wiring on the glass substrate, control the corresponding series resistance circuit to be connected in series to the loop of the power chip and the glass substrate to control the peak current value output by the power chip;

[0056] Among them, the resistance values ​​of resistors after being connected to different series resistance circuits are different.

[0057] By detecting and calculating the voltage difference of the driving signal flowing into the data driving chip within a unit time; according to the voltage difference and the resistance value of the wiring on the glass substrate, controlling the corresponding series resistance circuit to be connected in series to the loop of the power chip and the glass substrate, so as to control the peak current value output by the power chip, so as 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 driving chip and the stability of the display screen.

[0058] like Figure 8 As shown, as the sixth embodiment of the present application, it is a further refinement and improvement of the fifth embodiment, the voltage difference value uses the grayscale change value as a reference, the series resistance circuit is provided with four, namely, a first series resistance circuit, a second series resistance circuit, a third series resistance circuit and a fourth series resistance circuit, the resistances of the four series resistance circuits connected in series to the loop of the power chip and the glass substrate are respectively the first resistance, the second resistance, the third resistance and the fourth resistance, the step S2 comprises:

[0059] S21: when the grayscale change value is less than or equal to the first preset grayscale, the current output by the power chip is not processed;

[0060] S22: When the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, the first series resistance circuit is turned on to connect the first resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, the second series resistance circuit is turned on to connect the second resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, the third series resistance circuit is turned on to connect the third resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, the fourth series resistance circuit is turned on to connect the fourth resistor in series to the loop between the power chip and the glass substrate, so as to adjust the current output by the power chip.

[0061] In step S22, a controller is selected to generate a corresponding control signal according to the grayscale change value, and the corresponding series resistance circuit is controlled to be turned on at the same time when the driving signal changes, and the series resistance circuit is turned off within a preset time; wherein the preset time is 1 / 15 to 1 / 8 of the pixel charging time.

[0062] In this embodiment, the calculated grayscale difference is compared with the preset grayscale, and the corresponding series resistance circuit is selected according to the comparison result to adjust the power supply current. The values ​​of the first preset grayscale, the second preset grayscale, the third preset grayscale, the fourth preset grayscale and the fifth preset grayscale are increased in sequence, and can be increased in equal proportion or according to preset requirements. In this application, it is considered that the current peak value can be relatively large when the grayscale difference exceeds 20, so the value of the first preset grayscale can be selected as 20 grayscale, the second preset grayscale, the third preset grayscale, the fourth preset grayscale and the fifth preset grayscale are 100 gray, 150 gray, 200 gray and 250 gray respectively. If the grayscale difference is within 20 grayscale, the current output by the power chip is not processed; if the grayscale difference is within 21 grayscale to 100 grayscale, the first series resistance circuit is connected, the first control signal and the second control signal control the first control switch and the second control switch to be turned on, and the current output by the power chip is changed after passing through the first resistor to be output to the wiring of the glass substrate and finally input into the display panel. If the grayscale difference is within 20 grayscale, the current output by the power chip is not processed; if the grayscale difference is within 21 grayscale to 100 grayscale, the first series resistance circuit is connected, the first control signal and the second control signal control the first control switch and the second control switch to be turned on, and the current output by the power chip is changed after passing through the first resistor to be output to the wiring of the glass substrate and finally input into the display panel. When the grayscale difference is within the range of 101 grayscales to 150 grayscales, the second series resistor circuit is connected, the first control signal and the third control signal control the third control switch and the fourth control switch to be turned on, and the current output by the power chip is changed after passing through the second resistor to be output to the wiring of the glass substrate and finally input into the display panel. If the grayscale difference is within the range of 151 grayscales to 200 grayscales, the third series resistor circuit is connected, the second control signal and the fourth control signal control the fifth control switch and the sixth control switch to be turned on, and the current output by the power chip is changed after passing through the third resistor to be output to the wiring of the glass substrate and finally input into the display panel. If the grayscale difference is within the range of 201 grayscales to 250 grayscales, the fourth series resistor circuit is connected, the third control signal and the fourth control signal control the seventh control switch and the eighth control switch to be turned on, and the current output by the power chip is changed after passing through the fourth resistor to be output to the wiring of the glass substrate and finally input into the display panel. According to the load size fed back by the display panel, the size of the resistor in the series circuit resistor and the grayscale range value can be adjusted.

[0063] like Fig. 9 As shown, as the seventh embodiment of the present application, it is a further refinement and improvement of the sixth embodiment mentioned above, the driving circuit also includes a current regulation auxiliary circuit, the current regulation auxiliary circuit includes a current regulation detection unit, a ninth control switch and a fifth resistor, and the step S22 also includes the following steps:

[0064] S3: Detect the peak value of the adjusted current. If the peak value of the current is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs current to the series resistor circuit and the fifth resistor to reach the wiring of the glass substrate. The current adjustment detection unit detects the peak value of the adjusted current. If the peak value of the current is less than or equal to the preset value, the ninth control switch is controlled to be turned on. The power chip outputs current to the series resistor circuit and the ninth control switch to reach the wiring of the glass substrate.

[0065] This embodiment is equivalent to adding a detection and debugging step. After completing the basic current adjustment, considering that the grayscale difference is within a certain range, a fixed resistor is selected to adjust the current, and the difference between the front and rear grayscales within the grayscale range is relatively large, which may cause the latter current adjustment to be inaccurate. Therefore, a current adjustment auxiliary circuit is added for further detection to determine whether the adjusted current meets the requirements. If the adjusted current peak is still large, further adjustment is required by connecting it in series with a resistor again, that is, the fifth resistor, to further adjust the peak current.

[0066] like Fig.10 As shown, as the eighth 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.

[0067] 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. The load calculation module 140 determines the load, such as the voltage difference. If the difference is within the range, no processing is performed. If the difference is large, it means that the instantaneous current will increase. Then the control selector 170 selects the corresponding series resistance circuit 160 connected in series with the wiring loop to adjust the peak current to avoid severe load withdrawal, thereby affecting the power supply current and GND, resulting in 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 withdrawal during light and heavy load switching, maintaining the stability of the power supply and GND, and avoiding the problem that the current and voltage fluctuations of the power supply are too large, which causes the abnormal Gamma voltage level.

[0068] 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.

[0069] 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 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 current signal; A data driving chip is connected to the wiring on the glass substrate, receives the driving signal and the power current signal transmitted by the wiring, and generates a corresponding data signal and outputs it to the data line; A load calculation module, used for detecting and calculating a voltage difference of a driving signal flowing into the data driving chip within a unit time; and A current regulating module, arranged on the timing control board and connected to the power chip; Among them, the current regulation module includes multiple series resistance circuits and a control selector respectively connected in series with the power chip. The control selector controls the connection of the corresponding series resistance circuit according to the voltage difference of the load calculation module and the resistance of the wiring on the glass substrate to control the peak current value output by the power chip.

2. The driving circuit according to claim 1, characterized in that: At least two series resistance circuits are provided, each of which is provided with two control switches and a resistor. The resistor in each series resistance circuit is arranged between the two control switches. The control ends of the two control switches are respectively connected to a control selector. The control selector outputs different control signals to the two control switches in each series resistance circuit according to the voltage difference calculated by the load calculation module, so as to control the corresponding series resistance circuit to be connected in series to the loop of the power chip and the glass substrate.

3. The driving circuit according to claim 2, characterized in that: The four series resistance circuits are greater than or equal to four, and the four series resistance circuits are respectively a first series resistance circuit, a second series resistance circuit, a third series resistance circuit and a fourth series resistance circuit; The first series resistance circuit includes a first control switch, a second control switch and a first resistor, wherein the control end of the first control switch receives a first control signal, the input end is connected to a power chip, and the output end is connected to the input end of the second control switch through the first resistor, the control end of the second control switch receives a second control signal, and the output end is connected to a wiring on the glass substrate; The second series resistor circuit includes a third control switch, a fourth control switch and a second resistor, wherein the control end of the third control switch receives the first control signal, the input end is connected to the power chip, and the output end is connected to the input end of the fourth control switch through the second resistor, the control end of the fourth control switch receives the third control signal, and the output end is connected to the wiring on the glass substrate; The third series resistor circuit includes a fifth control switch, a sixth control switch and a third resistor, wherein the control end of the fifth control switch receives a fourth control signal, the input end is connected to a power chip, and the output end is connected to the input end of the sixth control switch through the third resistor, the control end of the sixth control switch receives a second control signal, and the output end is connected to a wiring on the glass substrate; The fourth series resistor circuit includes a seventh control switch, an eighth control switch and a fourth resistor, the control end of the seventh control switch receives a fourth control signal, the input end is connected to the power chip, and the output end is connected to the input end of the eighth control switch through the fourth resistor, the control end of the eighth control switch receives a third control signal, and the output end is connected to the wiring on the glass substrate; Among them, the first control signal and the fourth control signal are a group of inverted control signals, the second control signal and the third control signal are a group of inverted control signals, and the first control signal, the second control signal, the third control signal and the fourth control signal control the corresponding control switch to be turned on for 1 / n of the pixel charging time, wherein n is a natural number greater than or equal to 8 and less than or equal to 15; the resistance values ​​of the first resistor, the second resistor, the third resistor and the fourth resistor increase in sequence.

4. The driving circuit according to claim 2, characterized in that: The driving circuit further includes a current regulation auxiliary circuit, the current regulation auxiliary circuit includes a current regulation detection unit, a ninth control switch and a fifth resistor, the current regulation auxiliary circuit is arranged between the series resistance circuit and the wiring of the glass substrate, the control end of the ninth control switch is connected to the current regulation detection unit, the input end is connected to the output end of the series resistance circuit, the output end is connected to the wiring of the glass substrate, one end of the fifth resistor is connected to the series resistance circuit, and the other end is connected to the wiring of the glass substrate; The current regulation detection unit detects the peak value of the adjusted current. If the peak value of the current is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs current to the series resistor circuit and the fifth resistor to reach the wiring of the glass substrate. The current regulation detection unit detects the peak value of the adjusted current. If the peak value of the current is less than or equal to the preset value, the ninth control switch is controlled to be turned on, and the power chip outputs current to the series resistor circuit and the ninth control switch to reach the wiring of the glass substrate.

5. The driving circuit according to claim 2, characterized in that: The driving circuit further includes a plurality of current regulation auxiliary circuits, each of which is correspondingly arranged between each series resistance circuit and the wiring of the glass substrate, each of which includes a current regulation detection unit, a ninth control switch and a fifth resistor, and the current regulation auxiliary circuit is arranged between the series resistance circuit and the wiring of the glass substrate, the control end of the ninth control switch is connected to the current regulation detection unit, the input end is connected to the output end of the series resistance circuit, and the output end is connected to the wiring of the glass substrate, and one end of the fifth resistor is connected to the series resistance circuit, and the other end is connected to the wiring of the glass substrate; The current regulation detection unit detects the peak value of the adjusted current. If the peak value of the current is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs current to the series resistor circuit and the fifth resistor to reach the wiring of the glass substrate. The current regulation detection unit detects the peak value of the adjusted current. If the peak value of the current is less than or equal to the preset value, the ninth control switch is controlled to be turned on, and the power chip outputs current to the series resistor circuit and the ninth control switch to reach the wiring of the glass substrate.

6. A driving method, characterized in that: Used to drive the driving circuit according to any one of claims 1 to 5, the driving circuit comprising a timing control board and a glass substrate, the timing control board is provided with a current regulating module, the current regulating module comprises a plurality of series resistance circuits, and the driving method comprises: Detecting and calculating a voltage difference of a driving signal flowing into the data driving chip within a unit time; and According to the voltage difference and the resistance of the wiring on the glass substrate, the corresponding series resistance circuit is controlled to be connected in series to the loop of the power chip and the glass substrate to control the peak current value output by the power chip; Among them, the resistance values ​​of resistors after being connected to different series resistance circuits are different.

7. The driving method according to claim 6, characterized in that: The voltage difference is a grayscale change value, the series resistance circuit is provided with four series resistance circuits, namely a first series resistance circuit, a second series resistance circuit, a third series resistance circuit and a fourth series resistance circuit, the four series resistance circuits are connected in series to the loop resistances of the power chip and the glass substrate in the first resistance, the second resistance, the third resistance and the fourth resistance, and the step of controlling the corresponding series resistance circuits to be connected in series to the loop of the power chip and the glass substrate according to the voltage difference and the resistance of the wiring on the glass substrate to control the peak current value output by the power chip includes: When the grayscale change value is less than or equal to the first preset grayscale, the current output by the power chip is not processed; When the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, the first series resistance circuit is turned on to connect the first resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, the second series resistance circuit is turned on to connect the second resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, the third series resistance circuit is turned on to connect the third resistor in series to the loop between the power chip and the glass substrate; when the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, the fourth series resistance circuit is turned on to connect the fourth resistor in series to the loop between the power chip and the glass substrate to adjust the current output by the power chip.

8. The driving method according to claim 7, characterized in that: The step of turning on the first series resistor circuit to connect the first resistor in series to the loop between the power chip and the glass substrate when the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, turning on the second series resistor circuit to connect the second resistor in series to the loop between the power chip and the glass substrate when the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, turning on the third series resistor circuit to connect the third resistor in series to the loop between the power chip and the glass substrate when the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, turning on the fourth series resistor circuit to connect the fourth resistor in series to the loop between the power chip and the glass substrate when the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, so as to adjust the current output by the power chip includes: Generate a corresponding control signal according to the grayscale change value, control the corresponding series resistance circuit to be turned on at the same time when the driving signal changes, and turn off the series resistance circuit within a preset time; The preset time is 1 / 15 to 1 / 8 of the pixel charging time.

9. The driving method according to claim 7, characterized in that: The driving circuit further includes a current regulation auxiliary circuit, which includes a current regulation detection unit, a ninth control switch and a fifth resistor. When the grayscale change value is greater than the first preset grayscale and less than or equal to the second preset grayscale, the first series resistor circuit is turned on to connect the first resistor in series to the loop between the power chip and the glass substrate. When the grayscale change value is greater than the second preset grayscale and less than or equal to the third preset grayscale, the second series resistor circuit is turned on to connect the second resistor in series to the loop between the power chip and the glass substrate. When the grayscale change value is greater than the third preset grayscale and less than or equal to the fourth preset grayscale, the third series resistor circuit is turned on to connect the third resistor in series to the loop between the power chip and the glass substrate. When the grayscale change value is greater than the fourth preset grayscale and less than or equal to the fifth preset grayscale, the fourth series resistor circuit is turned on to connect the fourth resistor in series to the loop between the power chip and the glass substrate to adjust the current output by the power chip, the following steps are included after the step: The adjusted current peak value is detected. If the current peak value is greater than a preset value, the ninth control switch is controlled to be disconnected, and the power chip outputs current to the series resistor circuit and the fifth resistor to reach the wiring of the glass substrate. If the current peak value is less than or equal to the preset value, the ninth control switch is controlled to be turned on, and the power chip outputs current to the series resistor circuit and the ninth control switch to reach the wiring of the glass substrate.

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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