Driving circuit, driving method, and display device

Abstract

The application discloses a driving circuit, a driving method and a display device. The driving circuit comprises a time sequence control board, a glass substrate, a data driving chip, an electric signal acquisition module and a power supply voltage control module. The electric signal acquisition module is arranged between a power supply chip and the glass substrate and is used for acquiring the current between the power supply chip and the glass substrate. The power supply voltage control module is connected with the electric signal acquisition module and the power supply chip respectively. When the load change value on the display panel is greater than or equal to a first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value acquired by the electric signal acquisition module, and the power supply chip generates a target power supply voltage according to the voltage compensation value and outputs the target power supply voltage. The application controls the output size of the regulated power supply voltage through the load change value, provides instant stable voltage, and thus makes up for the instant load extraction problem of each voltage source, so as to solve the problem of large instant current load extraction in light and heavy load switching.

Description

Technical Field

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

[0002] As a flat panel display device, TFT-LCD (Thin Film Transistor Liquid Crystal Display) is increasingly used in high-performance display fields due to its small size, low power consumption, no radiation, and relatively low manufacturing cost. When a TFT-LCD is displaying, the grid lines on each row of the display panel are scanned line by line to activate the pixel units connected to that row of grid lines. The data lines output data signals to the activated pixel units to charge them.

[0003] To further reduce the production cost of LCD products, existing circuits used for scanning gate lines often employ a G0A (Gate Driver on Array) design, integrating the TFT (Thin Film Transistor) gate switching circuit onto the array substrate of the display panel to form a scanning drive for the display panel. Glass substrates are used as glass PCBs, but due to the high impedance and lack of capacitors on the glass substrate, the instantaneous load of the power supply voltage is large, affecting the stability of the power supply reference ground, i.e., the 0-level reference voltage GND, and thus affecting the stability of all power supplies and voltages. Summary of the Invention

[0004] The purpose of this application is to provide a drive circuit, drive method, and display device that can improve the problem of large instantaneous current withdrawal during light-load and heavy-load switching and maintain power supply voltage stability.

[0005] This application discloses a driving circuit for driving a display panel. The driving circuit comprises a timing control board, a glass substrate, a data driving chip, an electrical signal acquisition module, and a power supply voltage control module. The timing control board has a power chip that outputs power voltage / current signals. The glass substrate has multiple traces connected to the timing control board to receive the power voltage / current signals. The data driving chip is connected to the traces on the glass substrate and receives the power voltage / current signals transmitted by the traces. The electrical signal acquisition module is located between the power chip and the glass substrate and is used to acquire the current between the power chip and the glass substrate. The power supply voltage control module is located on the timing control board and is connected to both the electrical signal acquisition module and the power chip. When the load change value on the display panel is greater than or equal to a first preset value, the power supply voltage control module calculates a corresponding voltage compensation value based on the real-time current value acquired by the electrical signal acquisition module. The power chip generates a target power supply voltage based on the voltage compensation value and outputs it to the traces on the glass substrate.

[0006] Optionally, the electrical signal acquisition module includes a first resistor circuit, a current detection circuit, and a logic control circuit. The power supply voltage control module, including the logic control circuit, is disposed on the timing control board. The input terminal of the first resistor circuit is connected to the power chip to receive the power supply voltage signal, and the output terminal is connected to the trace on the glass substrate to output the power supply voltage signal to the trace on the glass substrate. The input terminal of the current detection circuit is connected to the input terminal of the first resistor circuit, and the first output terminal is connected to the output terminal of the first resistor circuit. The input terminal of the logic control circuit is connected to the second output terminal of the current detection circuit, and the output terminal is connected to the power chip. The logic control circuit calculates the corresponding voltage compensation value based on the current value acquired by the current detection circuit and outputs it to the power chip to compensate the power supply voltage signal output by the power chip.

[0007] Optionally, the driving circuit further includes a power supply voltage signal verification module. The input terminal of the power supply voltage signal verification module is connected to the glass substrate, the first output terminal is connected to the data driving chip, and the second output terminal is connected to the logic control circuit. When the voltage value obtained by the power supply voltage signal verification module is greater than or equal to a preset value, the logic control circuit regenerates a new voltage compensation value and outputs it to the power chip. The power chip generates a new target power supply voltage based on the new voltage compensation value and outputs it.

[0008] Optionally, the current detection circuit acquires the current value of the first resistor circuit in real time and obtains the corresponding current curve. Based on the current curve, a preset number of acquisition points are selected, and the change in unit current is calculated based on the current at the acquisition points. Based on the change in unit current, the maximum voltage after instantaneous load withdrawal is calculated. The logic control circuit generates a corresponding compensation voltage based on the current at the acquisition points and the maximum voltage after instantaneous load withdrawal, and forms a voltage compensation curve. The power chip generates a corresponding target power supply voltage based on the voltage compensation curve and outputs it to the traces on the glass substrate. The larger the change in unit current, the larger the instantaneous load current, and the larger the target power supply voltage value generated according to the voltage compensation curve. The smaller the change in unit current, the smaller the instantaneous load current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

[0009] Optionally, the first resistor circuit includes a first variable resistor, the resistance value of which includes at least a first range value, a second range value, and a third range value. When the load change value on the display panel is greater than or equal to a first preset value, the resistance value of the first variable resistor is within the first range value. When the load change value on the display panel is greater than the first preset value and less than the second preset value, the resistance value of the first variable resistor is within the second range value. When the load change value on the display panel is greater than or equal to the second preset value, the resistance value of the first variable resistor is within the third range value.

[0010] Optionally, the first resistor circuit includes a first resistor, and the current detection circuit includes a comparator. The positive terminal of the comparator is connected to the input terminal of the first resistor, the negative terminal is connected to the output terminal of the first resistor, and the output terminal is connected to the logic control circuit.

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

[0012] The current between the power chip and the glass substrate is collected;

[0013] Based on the comparison between the load change value and the preset value, determine whether to adjust the power supply voltage input to the glass substrate traces; and

[0014] When the load change value on the display panel is greater than or equal to the first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module, and the power chip generates the target power supply voltage according to the voltage compensation value and outputs it to the traces of the glass substrate.

[0015] Optionally, the electrical signal acquisition module includes a first resistor circuit and a current detection circuit, and the power supply voltage control module includes a logic control circuit. When the load change value on the display panel is greater than or equal to a first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value acquired by the electrical signal acquisition module. The step of the power chip generating a target power supply voltage based on the voltage compensation value and outputting it to the traces on the glass substrate includes:

[0016] The current detection circuit collects the current value of the first resistor circuit in real time and obtains the corresponding current curve.

[0017] Based on the current curve, a preset number of sampling points are selected, and the change in unit current is calculated based on the current at the sampling points.

[0018] If the change in the single current after rising and falling at the sampling point does not meet the change from maximum to minimum, then continue to add sampling points until the sampling points meet the preset requirements, and stop sampling.

[0019] The maximum voltage after instantaneous deload is calculated based on the measured change in unit current.

[0020] Based on the current at the sampling point and the maximum voltage after instantaneous deloading, a corresponding compensation voltage is generated, and a voltage compensation curve is formed. The power chip generates a corresponding target power supply voltage according to the voltage compensation curve and outputs it to the traces on the glass substrate.

[0021] The greater the change in unit current, the greater the instantaneous pump-out current, and the greater the target power supply voltage value generated according to the voltage compensation curve; the smaller the change in unit current, the smaller the instantaneous pump-out current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

[0022] Optionally, in the process of selecting a preset number of sampling points based on the current curve and calculating the change in unit current based on the current of the sampling points, the spacing between adjacent sampling points is equal, and the corresponding voltage compensation value is calculated based on the first preset formula.

[0023] This application also discloses a display device, which includes a driving circuit and a display panel as described in any of the above descriptions, wherein the driving circuit is used to drive the display panel.

[0024] Compared to solutions that directly adjust data voltage, this application uses a glass substrate to reduce costs while incorporating an electrical signal acquisition module to collect the current between the power chip and the glass substrate. When the load change on the display panel is greater than or equal to a first preset value, the power voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module. The power chip generates a target power voltage based on the voltage compensation value and outputs it to the traces on the glass substrate. By calculating the voltage compensation value using the collected current value, an instantaneously stable voltage is provided to compensate for the instantaneous load withdrawal problem of various voltage sources. This addresses the issue of large instantaneous current withdrawal during light-to-heavy load switching, maintains the stability of the power supply and the 0-level reference voltage GND, and prevents excessive fluctuations in power supply current and voltage that could lead to abnormal gamma levels, affecting the display panel's display. Attached Figure Description

[0025] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0026] Figure 1 This is a schematic diagram of the drive circuit of the first embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the drive circuit of the second embodiment of this application;

[0028] Figure 3 This is a schematic diagram of another driving circuit according to the second embodiment of this application;

[0029] Figure 4 This is a waveform diagram of the power supply voltage and power supply current output by the power supply chip of the second embodiment of this application;

[0030] Figure 5 This is a schematic diagram of multi-point acquisition of power supply current waveform according to the second embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the power supply voltage after compensation according to the second embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the drive circuit according to the third embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the drive circuit according to the fourth embodiment of this application;

[0034] Figure 9 This is a flowchart illustrating the driving method of the fifth embodiment of this application;

[0035] Figure 10 This is a flowchart illustrating the driving method of the sixth embodiment of this application;

[0036] Figure 11 This is a schematic diagram of the structure of the display device according to the seventh embodiment of this application.

[0037] Among them, 100 is the driving circuit; 110 is the timing control board; 111 is the power chip; 120 is the glass substrate; 130 is the data driving chip; 140 is the electrical signal acquisition module; 141 is the first resistor circuit; 142 is the current detection circuit; 150 is the power supply voltage control module; 151 is the logic control circuit; 160 is the power supply voltage signal verification module; 161 is the voltage detection circuit; 200 is the display panel; 300 is the display device; first resistor - R1; first variable resistor - Rt; resistor - R. Detailed Implementation

[0038] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0039] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0040] refer to Figure 1As shown in the first embodiment of this application, a driving circuit 100 is disclosed. The driving circuit 100 is used to drive the display panel 200 to display. The driving circuit 100 includes a timing control board 110, a glass substrate 120, a data driving chip 130, an electrical signal acquisition module 140, and a power supply voltage control module 150. The timing control board 110 is equipped with a power chip 111, which outputs power supply voltage / current signals. The glass substrate 120 is provided with multiple traces connected to the timing control board 110 to receive power supply voltage / current signals. The data driving chip 130 is connected to the traces on the glass substrate 120 to receive the power supply voltage / current signals transmitted by the traces. The electrical signal acquisition module 140 is disposed on the power chip 111. Between the power chip 111 and the glass substrate 120, a current acquisition module 150 is used to collect the current between the power chip 111 and the glass substrate 120. The power voltage control module 150 is disposed on the timing control board 110 and is connected to the electrical signal acquisition module 140 and the power chip 111 respectively. When the load change value on the display panel 200 is greater than or equal to a first preset value, the power voltage control module 150 calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module 140. The power chip 111 generates a target power voltage according to the voltage compensation value and outputs it to the traces of the glass substrate 120. The electrical signal acquisition module 140 actually detects the voltage between the power chip 111 and the glass substrate 120, and the detected voltage reflects the magnitude of the current at this time.

[0041] In this application, a glass substrate 120 is used as the PCB board. Although this reduces costs, the impedance of the glass is much greater than that of a normal PCB (more than 10 times the impedance). Furthermore, the glass PCB lacks capacitors for voltage regulation and current freewheeling, leading to a series of problems, such as instantaneous voltage source withdrawal. The most critical issue is the stability of the power supply voltage and GND. To ensure the stability of the power supply voltage and GND, an electrical signal acquisition module 140 is installed between the power chip 111 and the glass substrate 120 to acquire the current between them. When the load change value on the display panel 200 is greater than or equal to the first preset value, the power supply voltage control module 150 calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module 140. The power chip 111 generates the target power supply voltage according to the voltage compensation value and outputs it to the traces of the glass substrate 120. The voltage compensation value is calculated by collecting the current value to provide an instantaneously stable voltage, thereby compensating for the instantaneous load withdrawal problem of each voltage source and reducing the problem of excessive voltage difference before and after the instantaneous load withdrawal caused by the heavy load screen of the display panel 200, so as to reduce the peak value and stabilize GND.

[0042] As a second embodiment of this application, it is a further refinement of the first embodiment described above, referring to... Figures 2 to 6 As shown, the electrical signal acquisition module 140 includes a first resistor circuit 141 and a current detection circuit 142, and the power supply voltage control module 150 includes a logic control circuit 151. The first resistor circuit 141, the current detection circuit 142, and the logic control circuit 151 are disposed on the timing control board 110. The input terminal of the first resistor circuit 141 is connected to the power chip 111 to receive the power supply voltage signal, and the output terminal is connected to the trace on the glass substrate 120 to output the power supply voltage signal to the trace on the glass substrate 120. The input terminal of the current detection circuit 142 is connected to the input terminal of the first resistor circuit 141, and the first output terminal is connected to the output terminal of the first resistor circuit 141. The input terminal of the logic control circuit 151 is connected to the second output terminal of the current detection circuit 142, and the output terminal is connected to the power chip 111. The logic control circuit 151 calculates the corresponding voltage compensation value according to the current value acquired by the current detection circuit 142 and outputs it to the power chip 111 to compensate the power supply voltage signal output by the power chip 111.

[0043] The current detection circuit 142 collects the current value of the first resistor circuit 141 in real time and obtains the corresponding current curve. Based on the current curve, a preset number of sampling points are selected, and the change in unit current is calculated based on the current of the sampling points, that is, the slope of the sampling points on the current curve. Based on the change in unit current, the maximum voltage after instantaneous load withdrawal is calculated. Instantaneous load withdrawal is the phenomenon of excessive instantaneous change in current and voltage caused by the switching between light and heavy load screens on the display panel 200. The logic control circuit 151 generates a corresponding compensation voltage based on the current of the sampling points and the maximum voltage after instantaneous load withdrawal, and forms a voltage compensation curve. The power chip 111 generates a corresponding target power supply voltage according to the voltage compensation curve and outputs it to the traces of the glass substrate 120.

[0044] The greater the change in unit current, the greater the instantaneous pump-out current, and the greater the target power supply voltage value generated according to the voltage compensation curve; the smaller the change in unit current, the smaller the instantaneous pump-out current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

[0045] Generally, the first resistor circuit 141 includes a first resistor, and the current detection circuit 142 includes a comparator. The positive terminal of the comparator is connected to the input terminal of the first resistor, the negative terminal is connected to the output terminal of the first resistor, and the output terminal is connected to the logic control circuit 151.

[0046] In this embodiment, the change in load from light to heavy or from heavy to light on the display panel 200 is caused by a sudden change in data voltage. Given a fixed trace resistance and downstream load, the greater the voltage difference per unit time, the greater the current. The current output from the power supply to the display panel 200 is essentially a charging process. Therefore, in the circuit, the change in charge during capacitor charging is proportional to time. Based on the definition of current (I=dQ / dt), the formula for calculating capacitance can be derived. Let the potential difference between the capacitor plates be V, the charge be Q, and the time be t. At the start of charging, the charge on the capacitor is t, then I=dQ / dt=Q / t. According to the definition of capacitance and charge, C=Q / V, we can derive I=dQ / dt=C(dV / dt)=CV / t, V=It / C. Where C represents capacitance, measured in farads (F), Q represents the amount of charge stored in the capacitor, measured in coulombs (C), and V represents the potential difference between the two plates of the capacitor, measured in volts (V).

[0047] As shown in the formula above, the change in charging current per unit time affects the instantaneous change in voltage. Normal voltage sources have feedback regulation, such as... Figure 4 As shown, the voltage returns to the corresponding voltage level after being pulled down quickly, but there is a delay in the feedback of the output voltage, which also causes a delay in the adjustment of the voltage source. Therefore, by directly monitoring the load current itself, i.e. the rapid change of di / dt, a rapid response can be made.

[0048] This application monitors the current supplied to the data driver chip 130 (Source Driver) by the VAA voltage source (i.e., monitors near-end current changes and can react quickly). The current detection module detects the voltage across the first resistor R1 to reflect the magnitude of the current. Because the current change time is very short, our sampling rate cannot be particularly high. Therefore, we calculate the change in current per unit time by collecting a portion of the current data to determine the magnitude of the current draw. Since there are countless display scenarios, we cannot perform VAA voltage calibration for each display scenario; therefore, detecting the change in current per unit time is the most direct and effective method.

[0049] like Figure 5 As shown, during the instantaneous load withdrawal caused by the switching between light and heavy loads, the current of the VAA acts before the voltage of the VAA. Therefore, it can be seen that the current of the VAA has a large slope during the switching between light and heavy loads, while the voltage of the VAA decreases slowly. Therefore, monitoring the current to control the voltage can effectively solve the problem of voltage fluctuation.

[0050] like Figure 6As shown, this is the sampling model of this application. The curve represents the current of IAA, and the step line represents the voltage of VAA. Because the curve rises and falls relatively quickly, we cannot have too many sampling points (the more sampling points, the higher the required sampling rate and the higher the cost). Therefore, we set 5 sampling points for both the rise and fall. If the load or deload is larger, we can increase the number of sampling points. The sampling points can also be determined adaptively. For example, with an initial 5 sampling points, the slope after the rise and fall is collected. If it is found that the 5 sampling points cannot capture the change from the maximum to the minimum slope, the logic control circuit 151 records and judges. If it does not meet the preset condition, the sampling points can be increased and the next sampling can be performed until the complete rise and fall process can be captured. For example, if there are currently 10 sampling points, with 5 rises and 5 falls, the slopes collected from front to back are (0.9, 0.8, 0.6, 0.3, -0.3, -0.6, -0.3, -0.1, 0, 0), which proves that the sampling time interval is too large and there are too few sampling points. Then, 4 more sampling points are added with equal intervals, and sampling continues until the approximate rise and fall process can be captured. This is the optimal number of sampling points.

[0051] After determining the number of sampling points, these points need to be processed. The time point is the point where the current at its highest value is taken as the time point. Since V=It / C, and the sampling points are evenly spaced, t is a known time for each sampling point, and C is the capacitance of the panel, which is known from the initial design stage. The sampled current I can be determined through the sampling points, allowing estimation of the maximum voltage after instantaneous load withdrawal. This leads to the calculation of voltages V1~V9, which can then be adjusted by changing the voltage of VAA to obtain the desired result. Figure 6 The voltage curve shown is used to compensate for the voltage of VAA, thus obtaining a relatively smooth VAA voltage value. Similarly, this method can be used for all voltage values, including GND, to compensate for problems caused by light and heavy load cutting. Figure 5 The VAA curve in the figure represents the actual VAA voltage. Figure 6 The VAA voltage diagram for compensation has the original voltage and the compensation voltage being concave and convex, respectively. When combined, they form a relatively stable voltage value for output.

[0052] Additionally, it should be noted that sampling compensation has another advantage: in the early stages, the slope can be used to determine the magnitude of the load withdrawal. The larger the slope, the larger the instantaneous load withdrawal current, and the lower the voltage is pulled down. Therefore, the first sampling point can be set closer to the load switching point to monitor the rapid rate of change in the early stages. Since there is a delay in voltage, the voltage source is set to act first based on the current to pull down the peak value. Moreover, this step-by-step increase converts the current acquisition data into step voltage data, which will not cause the voltage to be too high and there is no delay.

[0053] refer to Figure 7As shown, the third embodiment of this application is a further refinement of the first embodiment described above. The electrical signal acquisition module 140 includes a first resistor circuit 141, a current detection circuit 142, and a logic control circuit 151. The first resistor circuit 141, the current detection circuit 142, and the logic control circuit 151 are disposed on the timing control board 110. The input terminal of the first resistor circuit 141 is connected to the power chip 111 to receive the power supply voltage signal, and the output terminal is connected to the trace on the glass substrate 120 to output the power supply voltage signal to the trace on the glass substrate 120. The input terminal of the current detection circuit 142 is connected to the input terminal of the first resistor circuit 141, and the first output terminal is connected to the output terminal of the first resistor circuit 141. The input terminal of the logic control circuit 151 is connected to the second output terminal of the current detection circuit 142, and the output terminal is connected to the power chip 111. The logic control circuit 151 calculates the corresponding voltage compensation value based on the current value acquired by the current detection circuit 142 and outputs it to the power chip 111 to compensate the power supply voltage signal output by the power chip 111.

[0054] The current detection circuit 142 collects the current value of the first resistor circuit 141 in real time and obtains the corresponding current curve. Based on the current curve, a preset number of sampling points are selected, and the change in unit current is calculated based on the current of the sampling points. Based on the change in unit current, the maximum voltage after instantaneous load withdrawal is calculated. Instantaneous load withdrawal is the phenomenon of excessive instantaneous change in current and voltage caused by the switching between light and heavy load screens on the display panel 200. The logic control circuit 151 generates a corresponding compensation voltage based on the current of the sampling points and the maximum voltage after instantaneous load withdrawal, and forms a voltage compensation curve. The power chip 111 generates a corresponding target power supply voltage based on the voltage compensation curve and outputs it to the traces of the glass substrate 120.

[0055] The greater the change in unit current, the greater the instantaneous pump-out current, and the greater the target power supply voltage value generated according to the voltage compensation curve; the smaller the change in unit current, the smaller the instantaneous pump-out current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

[0056] The difference between this embodiment and the second embodiment described above is that the first resistor circuit 141 includes a first variable resistor Rt. The resistance value of the first variable resistor Rt includes at least a first range value, a second range value, and a third range value. When the load change value on the display panel 200 is greater than or equal to a first preset value, the resistance value of the first variable resistor Rt is within the first range value. When the load change value on the display panel 200 is greater than the first preset value and less than the second preset value, the resistance value of the first variable resistor Rt is within the second range value. When the load change value on the display panel 200 is greater than or equal to the second preset value, the resistance value of the first variable resistor Rt is within the third range value.

[0057] The resistor in the first resistor circuit 141 can also be used as a current-limiting resistor. When the display panel 200 is under a particularly heavy load, the resistance can be increased to slow down the current change and reduce the degree to which the VAA voltage is pulled. When the load is relatively light, the resistance can be reduced to reduce the power consumption on the resistor. Different sizes of resistors can be selected for different models, different display modes, or panel usage time, etc.

[0058] refer to Figure 8 As shown, as the fourth embodiment of this application, which is a further improvement and refinement of any of the above embodiments, the driving circuit 100 further includes a power supply voltage signal verification module 160. The input terminal of the power supply voltage signal verification module 160 is connected to the glass substrate 120, the first output terminal is connected to the data driving chip 130, and the second output terminal is connected to the logic control circuit 151. When the voltage value obtained by the power supply voltage signal verification module 160 is greater than or equal to a preset value, the logic control circuit 151 regenerates a new voltage compensation value and outputs it to the power chip 111. The power chip 111 generates a new target power supply voltage according to the new voltage compensation value and outputs it.

[0059] Generally, the power supply voltage signal verification module 160 mainly consists of a resistor R and a voltage detection circuit 161. By re-verifying the voltage across the resistor, it acts as feedback to check whether the compensated voltage meets the requirements. If it does not meet the requirements, the electrical signal acquisition module 140 re-acquires the current between the power chip 111 and the glass substrate 120. The power supply voltage control module 150 calculates the corresponding voltage compensation value based on the real-time current value re-acquired by the electrical signal acquisition module 140 and compensates the target power supply voltage that the power chip 111 is about to output.

[0060] like Figure 9As shown, as a fifth embodiment of this 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 includes:

[0061] S1: Collect the current between the power chip and the glass substrate;

[0062] S2: Based on the comparison between the load change value and the preset value, determine whether to adjust the power supply voltage input to the glass substrate traces; and

[0063] S3: When the load change value on the display panel is greater than or equal to the first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module, and the power chip generates the target power supply voltage according to the voltage compensation value and outputs it to the traces of the glass substrate.

[0064] refer to Figure 1 and Figure 8 As shown, because the load change value within the display panel directly affects the current and voltage signals of the power chip, the zero-level voltage GND becomes inaccurate, leading to errors in all voltages and currents within the display panel, especially the gamma voltage. This results in inaccurate data voltages, affecting the normal display of the panel. The power chip and glass substrate are monitored by collecting the current between them. Based on a comparison of the load change value with a preset value, the power supply voltage input to the glass substrate's traces is adjusted. When the load change value on the display panel is greater than or equal to a first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module. The power chip generates a target power supply voltage based on the voltage compensation value and outputs it to the traces on the glass substrate to adjust and compensate the power supply voltage output by the power chip, maintaining the stability of the power supply and reference ground.

[0065] Glass-based PCBs offer significant cost reduction benefits compared to existing normal PCBs and represent a future trend. This method effectively reduces voltage peaks, smooths voltage, and maintains the stability of power supply and reference ground. Its ultimate goal is to ensure the normal operation of ICs and the stability of display images. This solution is particularly suitable for glass-based PCB platforms where there are no capacitors and where trace resistance and parasitic inductance are high. Algorithms can solve the existing problems of glass-based PCBs.

[0066] like Figure 10 As shown, the sixth embodiment of this application is a further refinement and improvement of the fourth embodiment described above. (Refer to...) Figures 2 to 6 as well as Figure 10As shown, the electrical signal acquisition module includes a first resistor circuit, a current detection circuit, and a logic control circuit. Step S3 includes:

[0067] S31: The current detection circuit collects the current value of the first resistor circuit in real time and obtains the corresponding current curve;

[0068] S32: Select a preset number of sampling points based on the current curve, and calculate the change in unit current based on the current of the sampling points;

[0069] S33: When the change in the single current after rising and falling at the sampling point does not meet the change from maximum to minimum, continue to add sampling points until the sampling points meet the preset requirements, and then stop sampling.

[0070] S34: Calculate the maximum voltage after instantaneous deload based on the collected change in unit current;

[0071] S35: Based on the current at the sampling point and the maximum voltage after instantaneous deload, a corresponding compensation voltage is generated, and a voltage compensation curve is formed. The power chip generates a corresponding target power supply voltage according to the voltage compensation curve and outputs it to the traces of the glass substrate.

[0072] The greater the change in unit current, the greater the instantaneous pump-out current, and the greater the target power supply voltage value generated according to the voltage compensation curve; the smaller the change in unit current, the smaller the instantaneous pump-out current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

[0073] In the process of selecting a preset number of sampling points based on the current curve and calculating the change in unit current based on the current of the sampling points, the spacing between adjacent sampling points is equal, and the corresponding voltage compensation value is calculated based on a first preset formula, where the first preset formula is V=It / C, the sampling points are sampled at equal intervals, I is the sampling current, t is the time for each sampling point, and C is the capacitance of the panel.

[0074] Because the current and voltage curves output by the power chip rise and fall rapidly, the number of sampling points cannot be excessive (more sampling points require a higher sampling rate, increasing costs). Generally, five sampling points are set for both the rise and fall phases. If the load is larger, more sampling points can be added. Alternatively, sampling points can be determined adaptively. For example, with initial five sampling points, the slope after the rise and fall is collected. If it is found that the five sampling points cannot capture the change from maximum to minimum slope, the logic control circuit records and judges. If it does not meet the preset conditions, more sampling points can be added for the next sampling, until the complete rise and fall process can be captured. For example, if there are currently 10 sampling points (five for the rise and five for the fall), and the slopes from beginning to end are (0.9, 0.8, 0.6, 0.3, -0.3, -0.6, -0.3, -0.1, 0, 0), it proves that the sampling time interval is too large and the number of sampling points is too small. Then, four more sampling points with equal intervals are added, and sampling continues until the approximate rise and fall process can be captured. This is the optimal number of sampling points for this project.

[0075] After determining the number of sampling points, these points need to be processed. The time point is the point where the current at its highest value is taken as the sampling point. Since V=It / C, and the sampling points are evenly spaced, t is a known time for each sampling point, and C is the capacitance of the panel, which is known from the initial design stage. The sampled current I can be determined through the sampling points, allowing estimation of the maximum voltage after instantaneous load withdrawal. This allows calculation of the voltages V1~V9, and adjustment of the VAA voltage to obtain the desired result. Figure 6 The voltage curve shown is used to compensate for the voltage of VAA, thus obtaining a relatively smooth VAA voltage value. Similarly, this method can be used for all voltage values, including the ground terminal GND, to compensate for problems caused by light and heavy load cutting.

[0076] like Figure 11 As shown, as the seventh embodiment of this application, a display device 300 is disclosed. The display device 300 includes a driving circuit 100 and a display panel 200 as described in any of the above embodiments. The driving circuit 100 drives the display panel 200 using the driving method described in the above embodiments.

[0077] refer to Figure 1 and Figure 10As shown, this application uses a glass substrate 120 as a circuit board for routing traces. The power supply voltage pre-input to the display panel is adjusted based on the resistance value between the power chip and the glass substrate. When the load change value on the display panel is greater than or equal to a first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module. This provides an instantaneously stable voltage, preventing excessive voltage differences before and after the display panel switches between light and heavy loads, which could lead to severe load dumping and affect the power supply current and GND levels, resulting in abnormal gamma voltage levels. Furthermore, it eliminates the need for additional current-changing or voltage-changing circuits to adjust the power supply voltage, thus compensating for the instantaneous load dumping problem of each voltage source. This solves the problem of large instantaneous current dumping during light-heavy load switching, maintains the stability of the power supply and GND, and avoids problems caused by excessive current and voltage fluctuations leading to abnormal gamma voltage levels.

[0078] It should be noted that the limitations on the steps involved in this solution, without affecting the implementation of the specific solution, are not considered as limiting the order of the steps. That is, the steps listed first can be performed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the protection scope of this application. The inventive concept of this application can form many embodiments, but due to space limitations in the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. The combination of embodiments or technical features will enhance the original technical effect.

[0079] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A driving circuit, said driving circuit being used to drive a display panel to display, characterized in that, The driving circuit includes: A timing control board is provided, wherein a power chip is provided on the timing control board, and the power chip outputs power voltage / current signals; The glass substrate has multiple traces connected to the timing control board to receive power supply voltage / current signals. The data driver chip is connected to the traces on the glass substrate and receives the power supply voltage / current signals transmitted by the traces. An electrical signal acquisition module, disposed between the power chip and the glass substrate, is used to acquire the current between the power chip and the glass substrate; and A power supply voltage control module is mounted on the timing control board and is connected to the electrical signal acquisition module and the power chip, respectively. When the load change value on the display panel is greater than or equal to the first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module, and the power chip generates the target power supply voltage according to the voltage compensation value and outputs it to the traces of the glass substrate. The electrical signal acquisition module includes a first resistor circuit and a current detection circuit. The power supply voltage control module includes a logic control circuit. The current detection circuit acquires the current value of the first resistor circuit in real time and obtains the corresponding current curve. Based on the current curve, a preset number of acquisition points are selected. The change in unit current is calculated based on the current at the acquisition points. Based on the change in unit current, the maximum voltage after instantaneous load withdrawal is calculated. The logic control circuit generates a corresponding compensation voltage based on the current at the acquisition points and the maximum voltage after instantaneous load withdrawal, and forms a voltage compensation curve. The power chip generates a corresponding target power supply voltage based on the voltage compensation curve and outputs it to the traces on the glass substrate.

2. The driving circuit as described in claim 1, characterized in that, The first resistor circuit, the current detection circuit, and the logic control circuit are disposed on the timing control board. The input terminal of the first resistor circuit is connected to the power chip to receive the power supply voltage signal, and the output terminal is connected to the trace on the glass substrate to output the power supply voltage signal to the trace on the glass substrate. The input terminal of the current detection circuit is connected to the input terminal of the first resistor circuit, and the first output terminal is connected to the output terminal of the first resistor circuit. The input terminal of the logic control circuit is connected to the second output terminal of the current detection circuit, and the output terminal is connected to the power chip. The logic control circuit calculates the corresponding voltage compensation value based on the current value collected by the current detection circuit and outputs it to the power chip to compensate the power supply voltage signal output by the power chip.

3. The driving circuit as described in claim 2, characterized in that, The driving circuit also includes a power supply voltage signal verification module. The input terminal of the power supply voltage signal verification module is connected to the glass substrate, the first output terminal is connected to the data driving chip, and the second output terminal is connected to the logic control circuit. Specifically, when the voltage value obtained by the power supply voltage signal verification module is greater than or equal to a preset value, the logic control circuit regenerates a new voltage compensation value and outputs it to the power chip. The power chip then generates a new target power supply voltage based on the new voltage compensation value and outputs it.

4. The driving circuit as described in claim 2 or 3, characterized in that, The greater the change in unit current, the greater the instantaneous pump-out current, and the greater the target power supply voltage value generated according to the voltage compensation curve. Conversely, the smaller the change in unit current, the smaller the instantaneous pump-out current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

5. The driving circuit as described in claim 2, characterized in that, The first resistor circuit includes a first variable resistor. The resistance value of the first variable resistor includes at least a first range value, a second range value, and a third range value. When the load change value on the display panel is greater than or equal to a first preset value, the resistance value of the first variable resistor is within the first range value. When the load change value on the display panel is greater than the first preset value and less than the second preset value, the resistance value of the first variable resistor is within the second range value. When the load change value on the display panel is greater than or equal to the second preset value, the resistance value of the first variable resistor is within the third range value.

6. The driving circuit as described in claim 2, characterized in that, The first resistor circuit includes a first resistor, and the current detection circuit includes a comparator. The positive terminal of the comparator is connected to the input terminal of the first resistor, the negative terminal is connected to the output terminal of the first resistor, and the output terminal is connected to the logic control circuit.

7. A driving method, characterized in that, The driving method is used to drive the driving circuit as described in any one of claims 1-6, and includes: The current between the power chip and the glass substrate is collected; Based on the comparison between the load change value and the preset value, determine whether to adjust the power supply voltage input to the glass substrate traces; and When the load change value on the display panel is greater than or equal to the first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value collected by the electrical signal acquisition module, and the power chip generates the target power supply voltage according to the voltage compensation value and outputs it to the traces of the glass substrate.

8. The driving method as described in claim 7, characterized in that, The electrical signal acquisition module includes a first resistor circuit and a current detection circuit, and the power supply voltage control module includes a logic control circuit. When the load change value on the display panel is greater than or equal to a first preset value, the power supply voltage control module calculates the corresponding voltage compensation value based on the real-time current value acquired by the electrical signal acquisition module. The step of the power chip generating a target power supply voltage based on the voltage compensation value and outputting it to the traces on the glass substrate includes: The current detection circuit collects the current value of the first resistor circuit in real time and obtains the corresponding current curve. Based on the current curve, a preset number of sampling points are selected, and the change in unit current is calculated based on the current at the sampling points. If the change in the single current after rising and falling at the sampling point does not meet the change from maximum to minimum, then continue to add sampling points until the sampling points meet the preset requirements, and then stop sampling. The maximum voltage after instantaneous deload is calculated based on the measured change in unit current. Based on the current at the sampling point and the maximum voltage after instantaneous deloading, a corresponding compensation voltage is generated, and a voltage compensation curve is formed. The power chip generates a corresponding target power supply voltage according to the voltage compensation curve and outputs it to the traces on the glass substrate. The greater the change in unit current, the greater the instantaneous pump-out current, and the greater the target power supply voltage value generated according to the voltage compensation curve; the smaller the change in unit current, the smaller the instantaneous pump-out current, and the smaller the target power supply voltage value generated according to the voltage compensation curve.

9. The driving method as described in claim 8, characterized in that, In the process of selecting a preset number of sampling points based on the current curve and calculating the change in unit current based on the current of the sampling points, the spacing between adjacent sampling points is equal, and the corresponding voltage compensation value is calculated based on the first preset formula.

10. A display device, characterized in that, It includes a driving circuit and a display panel as described in any one of claims 1-6, wherein the driving circuit is used to drive the display panel.

Images