Display panel driving method, display panel driving circuit and display equipment

Abstract

The embodiment of the invention relates to a display panel driving method, a display panel driving circuit and display equipment. The method comprises the following steps: determining a current value of a first current on a voltage transmission line connected with a display panel; outputting a second current in a preset proportion to the first current to the voltage transmission line based on the current value; the magnitude of the voltage on the input end of the voltage transmission line is determined, a detection voltage value is obtained, and the detection voltage is the voltage variation formed by applying the second current to the line resistor of the voltage transmission line; determining a compensation voltage output to the display panel according to the detection voltage value; and adjusting the voltage output to the display panel to the target voltage according to the compensation voltage. According to the embodiment of the invention, the output voltage is adjusted in real time, the voltage drop caused by the wire resistance of the wire in the voltage transmission line is automatically compensated, the stability of a display picture of the display panel is improved, and the fault risk caused by voltage abnormity is reduced.

Description

Technical Field

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

[0002] In some devices, due to the long length of the wire, the current transmission distance is long, the wire resistance is large, and the wire resistance will consume a lot of power, causing a voltage drop between the input voltage and the original voltage of the load connected to the wire. Therefore, the actual voltage received by the load of the device cannot reach the original voltage provided by the power supply, increasing the probability of equipment failure.

[0003] For example, in the field of display panel driving, data signals and voltage signals are transmitted through two sections of PCB (Printed Circuit Board). The middle of the panel is the proximal end, and the two sides are the distal ends. The PCB board, as a conductive medium, has a certain impedance, which causes a voltage drop between the voltage at the middle proximal input end and the voltage at the distal ends on both sides. The voltage input to the panel is lower than the original voltage output by the power supply, affecting the display effect of the display panel. Summary of the invention

[0004] In view of this, in order to solve some or all of the above technical problems, the embodiments of the present application provide a display panel driving method, a display panel driving circuit and a display device.

[0005] In a first aspect, an embodiment of the present application provides a display panel driving method, the method comprising: determining a current value of a first current on a voltage transmission line connected to a display panel; based on the current value, outputting a second current in a preset proportion to the first current to the voltage transmission line; determining the magnitude of a voltage on an input end of the voltage transmission line to obtain a detection voltage value, wherein the detection voltage is a voltage change formed by the second current being applied to a line resistance of the voltage transmission line; determining a compensation voltage output to the display panel based on the detection voltage value; and adjusting the voltage output to the display panel to a target voltage based on the compensation voltage.

[0006] In one possible embodiment, based on the current value, a second current in a preset ratio to the first current is output to the voltage transmission line, including: based on the current value, outputting a second current in an alternating current form with a preset frequency to the voltage transmission line, wherein the ratio of the amplitude of the second current to the current value of the first current is a preset ratio.

[0007] In a possible implementation, outputting a second current in an alternating current form with a preset frequency to the voltage transmission line based on the current value includes: outputting a second current with a square wave waveform with a preset frequency to the voltage transmission line based on a current detection signal.

[0008] In one possible implementation, determining the magnitude of the voltage at the input end of the voltage transmission line to obtain a detection voltage value includes: determining the amplitude of an AC detection voltage output to the input end of the voltage transmission line to obtain a detection voltage value representing the amplitude, wherein the AC detection voltage is formed by applying a second current in an AC form to a line resistance of the voltage transmission line.

[0009] In a possible implementation, adjusting the voltage output to the display panel to a target voltage according to the compensation voltage includes: determining the compensation voltage output to the display panel according to the amplitude of the AC detection voltage and a preset ratio.

[0010] In a second aspect, an embodiment of the present application provides a display panel driving circuit, wherein the display panel driving circuit comprises: a power management module, at least one group of voltage transmission lines and at least one voltage input port, wherein the power management module comprises at least one voltage output unit, each of the at least one voltage output unit is connected to a corresponding group of voltage transmission lines; at least one voltage input port is arranged side by side at the edge of the display panel; at least one group of voltage transmission lines and at least one voltage input port correspond one-to-one, and each group of voltage transmission lines is connected to the corresponding voltage input port; the power management module is used to execute the above-mentioned display panel driving method, and output a target voltage after voltage compensation to each group of voltage transmission lines in at least one group of voltage transmission lines; each group of voltage transmission lines in at least one group of voltage transmission lines is used to receive a corresponding target voltage and provide the target voltage to the display panel through the corresponding voltage input port.

[0011] In a possible implementation manner, each group of voltage transmission lines in the at least one group of voltage transmission lines has a line resistance related to the line length, and the line resistance of each group of voltage transmission lines is greater than or equal to a preset resistance value.

[0012] In one possible embodiment, the power management module includes a current detection unit and a current source unit, and the current detection unit and the current source unit are both connected to each group of voltage transmission lines in at least one group of voltage transmission lines; the current detection unit is used to detect the magnitude of a first current output to each group of voltage transmission lines in at least one group of voltage transmission lines to obtain a current detection signal; the current source unit is used to output a second current that is in a preset proportion to the first current to the corresponding voltage transmission line according to the current detection signal.

[0013] In one possible embodiment, the power management module includes a voltage detection unit, which is connected to each voltage output unit in at least one voltage output unit; the voltage detection unit is used to detect the voltage on each voltage transmission line in at least one group of voltage transmission lines to obtain a voltage detection signal, wherein the voltage detection signal represents the voltage change formed by the second current applied to the line resistance of the corresponding voltage transmission line; each voltage output unit in the at least one voltage output unit is used to determine a compensation voltage output to the corresponding voltage transmission line according to the voltage detection signal, and adjust the voltage output to the voltage transmission line to a target voltage according to the compensation voltage.

[0014] In the third aspect, an embodiment of the present application provides a display device, comprising: a display panel, a control main board and the display panel driving circuit described in the second aspect above; the power management module included in the display panel driving circuit is arranged on the control main board; each group of voltage transmission lines in the at least one group of voltage transmission lines included in the display panel driving circuit is connected to the control main board at one end and to the corresponding voltage input port at the other end; the at least one voltage input port included in the display panel driving circuit is arranged side by side at the edge of the display panel, and each voltage input port is used to receive an input voltage from the corresponding voltage transmission line and transmit the input voltage to the display panel.

[0015] The display panel driving method, display panel driving circuit and display device provided in the embodiments of the present application determine the current value of a first current on a voltage transmission line connected to the display panel; based on the current value, output a second current in a preset proportion to the first current to the voltage transmission line; determine the voltage on the input end of the voltage transmission line to obtain a detection voltage value; determine a compensation voltage to be output to the display panel based on the detection voltage value; and adjust the voltage output to the display panel to a target voltage based on the compensation voltage, thereby achieving real-time adjustment of the output voltage, automatically compensating for the voltage drop caused by the line resistance of the conductor in the voltage transmission line, outputting the compensated voltage to different positions on the display panel, so that the input voltages received at different positions on the display panel remain consistent, avoiding the display panel receiving different input voltages due to differences in line resistance, thereby improving the stability of the display screen of the display panel and reducing the risk of failure due to voltage abnormality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A flow chart of a display panel driving method provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the waveform of the AC detection current provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of a voltage transmission voltage drop compensation device provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of a display panel driving circuit provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of another display panel driving circuit provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of an equivalent circuit of a current source unit and a voltage transmission line provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of another display panel driving circuit provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the structure of a display device provided in an embodiment of the present application.

[0027] Reference numerals:

[0028] 400-display panel driving circuit; 401-power management module; 4011-voltage output unit; 4012-current detection unit; 4013-current source unit; 4014-voltage detection unit; 402-voltage transmission line; 403-voltage input port; 404-decoupling capacitor; 800-display device; 801-display panel; 802-control main board. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present application.

[0030] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present application are only used to distinguish between different steps, devices, modules and other objects, and do not represent any specific technical meanings, nor do they indicate the logical order between them.

[0031] It should also be understood that in this embodiment, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0032] It should also be understood that any component, data or structure mentioned in the embodiments of the present application can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0033] In addition, the term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0034] It should also be understood that the description of the various embodiments in this application focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0036] Technologies, circuits, and devices known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the above-mentioned technologies, circuits, and devices should be considered as part of the specification.

[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. To facilitate the understanding of the embodiments of the present application, the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] In order to solve the technical problem of voltage attenuation caused by line resistance in the prior art, the present application provides a display panel driving method, which can adjust the voltage output to the load device in real time, so that the voltage of the load device reaches a stable voltage for normal operation and reduces the failure rate of the equipment.

[0040] Figure 1 A flow chart of a display panel driving method provided in an embodiment of the present application. The method can be applied to a display panel and executed by a power management module of the display panel. For example, the power management module can be a power management integrated circuit (PMIC, Power Management IC). In addition, the execution subject of the method can be hardware or software. When the above-mentioned execution subject is hardware, the execution subject can be a chip or circuit board with a power management function. When the above-mentioned execution subject is software, the method can be implemented as multiple software or software modules, or as a single software or software module. No specific limitation is made here.

[0041] like Figure 1 As shown, the method specifically includes:

[0042] Step 101: determine a current value of a first current on a voltage transmission line connected to a display panel.

[0043] In some embodiments, the voltage transmission line is a line that transmits voltage to the display panel. The voltage transmission line may include but is not limited to at least one of the following forms of lines: lines laid on a printed circuit board, wires connecting different circuit boards, wiring ports, etc.

[0044] The first current is the driving current transmitted by the voltage transmission line when the display panel to which the voltage transmission line is connected is in operation. The current value can be represented by the collected current detection signal. The current detection signal can be various types of signals such as digital signals and analog signals. For example, the current detection signal can be a binary digital signal, which represents the magnitude of the first current; the current detection signal can be an analog voltage signal, and the magnitude of the voltage signal represents the magnitude of the first current.

[0045] Step 102: Based on the current value, output a second current in a preset proportion to the first current to the voltage transmission line.

[0046] In some embodiments, the current value of the first current is set to I, and the current value of the second current is set to k*I, where k is a preset ratio. The second current can be provided by a current source included in the electronic device that executes the method. For example, a programmable current source chip can be provided on the electronic device to realize the function of outputting the second current, or a constant current source circuit composed of devices such as an operational amplifier and a feedback resistor can be provided on the electronic device to output the corresponding second current according to the current detection signal.

[0047] Step 103, determining the voltage at the input end of the voltage transmission line to obtain a detection voltage value.

[0048] In some embodiments, the detection voltage is a voltage change amount formed by applying the second current to a line resistance of the voltage transmission line.

[0049] Specifically, before and after the second current is output to the voltage transmission line, the voltage at the input end of the voltage transmission line can be detected respectively. The difference between the two voltages is caused by the second current being applied to the line resistance, and the voltage difference ΔV can be used as the detection voltage.

[0050] For example, let R represent the line resistance of the voltage transmission line. Before and after the second current is transmitted on the line resistance, the current change is ΔI. Then the voltage difference caused by the line resistance is ΔV=R*ΔI, and ΔV can be used as the detection voltage.

[0051] Optionally, the line resistance of the voltage transmission line can be estimated in advance according to the arrangement structure of the voltage transmission line and the cross-sectional area and length of each wire, and the second current can be set according to the estimated line resistance and the range of the detection voltage that is conducive to measurement, so that the measurement voltage is adapted to the range of voltage detection.

[0052] Step 104: Determine a compensation voltage output to the voltage transmission line according to the electrical detection voltage value.

[0053] In some embodiments, the original voltage received by the voltage transmission line is V1, the actual voltage output by the voltage transmission line to the display panel is V2, and the voltage change (i.e., the detection voltage) generated by the detection current at both ends of the line resistor R is: ΔV = ΔI*R = k*I*R = k*(V1-V2), so V1-V2 = 1 / k*ΔV. Wherein, I*R is the voltage drop across the line resistor R when the second current is not provided to the voltage transmission line, i.e., V1-V2.

[0054] Step 105 , adjusting the voltage output to the display panel to a target voltage according to the compensation voltage.

[0055] In some embodiments, according to V1-V2=1 / k*ΔV, the compensation voltage can be 1 / k*ΔV. The electronic device executing this method can increase the output voltage to a certain extent based on V1 according to the compensation voltage, so that the voltage output by the voltage transmission line is close to or equal to the voltage required by the load device.

[0056] The display panel driving method provided in the embodiment of the present application determines the current value of a first current on a voltage transmission line connected to the display panel; based on the current value, outputs a second current in a preset proportion to the first current to the voltage transmission line; determines the magnitude of the voltage on the input end of the voltage transmission line to obtain a detection voltage value; determines a compensation voltage to be output to the display panel based on the detection voltage value; and adjusts the voltage output to the display panel to a target voltage based on the compensation voltage, thereby achieving real-time adjustment of the output voltage, automatically compensating for the voltage drop caused by the line resistance of the conductor in the voltage transmission line, outputting the compensated voltage to different positions on the display panel, and making the input voltages received at different positions on the display panel consistent, thereby avoiding the display panel receiving different input voltages due to differences in line resistance, thereby improving the stability of the display screen of the display panel and reducing the risk of failure due to voltage abnormality.

[0057] In some optional implementations, the above step 102 may be performed as follows:

[0058] Based on the current value, a second current in the form of an alternating current of a preset frequency is output to the voltage transmission line.

[0059] The ratio of the amplitude of the second current to the current value of the first current is a preset ratio.

[0060] Specifically, if the first current is I and the preset ratio is k, the amplitude ΔI=k*I, the maximum value of the detection current is +k*I, and the minimum value is -k*I. k can be set to any value, such as 2%. The frequency of the AC detection current can be set arbitrarily, such as 100Hz.

[0061] This embodiment can achieve superposition of the first current and the AC current by outputting a second current in AC form to the voltage transmission line, thereby generating a corresponding AC voltage signal on the line resistance. The AC voltage signal can be directly read by a detection tool, and the compensation voltage can be calculated based on the AC voltage signal, thereby improving the efficiency of determining the compensation voltage.

[0062] In some optional implementations, the second current in the form of an alternating current with a preset frequency may be output to the voltage transmission line in the following manner:

[0063] Based on the current detection signal, a second current having a square wave waveform and a preset frequency is output to the voltage transmission line.

[0064] like Figure 2 , which shows a second current in the form of a square wave, Figure 2 I in represents the first current, ΔI is the amplitude of the square wave, and the amplitude in the figure is 2%*I.

[0065] In this embodiment, by setting the waveform of the second AC current to a square wave, it is only necessary to output the set current according to the timing. This implementation method is simple, helps to reduce the difficulty of generating the second current, and improves the efficiency of configuring the circuit.

[0066] In some optional implementations, step 103 may be performed as follows:

[0067] The amplitude of the AC detection voltage output to the input end of the voltage transmission line is determined to obtain a detection voltage value representing the amplitude.

[0068] The AC detection voltage is formed by applying the second current in the form of AC to the line resistance of the voltage transmission line.

[0069] Specifically, assuming that the amplitude of the AC detection voltage is ΔI, according to the formula ΔI*R=ΔV, the amplitude of the AC detection voltage is proportional to the amplitude of the second current in the AC form, that is, the waveform of the AC detection voltage is the same as the waveform of the second current in the AC form. If the waveform of the second current in the AC form is Figure 2 If it is a square wave as shown, the waveform of the AC detection voltage is also a square wave.

[0070] This embodiment detects the amplitude of the AC detection voltage, thereby realizing that the waveform of the AC detection voltage can be detected directly from the input end of the voltage transmission line, and the voltage amplitude can be read. The compensation voltage can be determined based on the amplitude, thereby improving the efficiency and accuracy of determining the compensation voltage.

[0071] In some optional implementations, the above step 104 may be performed as follows:

[0072] The compensation voltage output to the display panel is determined according to the amplitude of the AC detection voltage and a preset ratio.

[0073] Specifically, according to the formula ΔV=ΔI*R=k*I*R=k*(V1-V2), where ΔV is the amplitude of the AC detection voltage, V1 is the voltage received by the voltage transmission line, and V2 is the voltage output by the voltage transmission line, after detecting ΔV, the voltage drop across the voltage transmission line can be calculated according to the formula. For example, if k=2%, then (V1-V2)=50*ΔV, and the compensation voltage can be 50*ΔV, that is, adding 50*ΔV on the basis of V1, so that the voltage output from the voltage transmission line to the display panel can be close to V1.

[0074] This embodiment can quickly obtain the compensation voltage by using the preset ratio and the amplitude of the detected AC detection voltage for calculation, so that the output voltage of the power management module can be efficiently and accurately adjusted according to the compensation voltage, thereby improving the accuracy and efficiency of voltage compensation.

[0075] Figure 3 A schematic diagram of a voltage transmission voltage drop compensation device provided in an embodiment of the present application. Specifically comprising:

[0076] A first detection module 301, used to determine a current value of a first current on a voltage transmission line connected to a display panel;

[0077] A current output module 302, configured to output a second current in a preset proportion to the first current to the voltage transmission line based on the current value;

[0078] The second detection module 303 is used to determine the voltage on the input end of the voltage transmission line to obtain a detection voltage value, wherein the detection voltage is a voltage change formed by the second current being applied to the line resistance of the voltage transmission line;

[0079] A determination module 304, configured to determine a compensation voltage to be output to the display panel according to the detected voltage value;

[0080] The adjustment module 305 is used to adjust the voltage output to the display panel to a target voltage according to the compensation voltage.

[0081] In some optional implementations, the current output module is further used to: based on the current value, output a second current in the form of an alternating current with a preset frequency to the voltage transmission line, wherein the ratio of the amplitude of the second current to the current value of the first current is a preset ratio.

[0082] In some optional implementations, the current output module is further used to: output a second current with a square wave waveform and a preset frequency to the voltage transmission line based on the current detection signal.

[0083] In some optional implementations, the second detection module is further used to: determine the amplitude of the AC detection voltage output to the input end of the voltage transmission line, and obtain a detection voltage value representing the amplitude, wherein the AC detection voltage is formed by applying a second current in AC form to the line resistance of the voltage transmission line.

[0084] In some optional implementations, the determination module is further used to: determine the compensation voltage output to the display panel according to the amplitude of the AC detection voltage and a preset ratio.

[0085] The voltage transmission voltage drop compensation device provided in this embodiment can be as follows Figure 3The voltage transmission voltage drop compensation device shown in can execute all steps of the above display panel driving methods, thereby achieving the technical effects of the above display panel driving methods. Please refer to the above related description for details. For the sake of brevity, it will not be repeated here.

[0086] Figure 4 A schematic diagram of the structure of a display panel driving circuit provided in an embodiment of the present application. The circuit specifically includes: a power management module 401, at least one group of voltage transmission lines 402 and at least one voltage input port 403. Among them, the power management module 401 includes at least one voltage output unit 4011, and each voltage output unit in the at least one voltage output unit 4011 is connected to a corresponding group of voltage transmission lines. That is, each voltage output unit corresponds to a group of voltage transmission lines and is connected to the corresponding voltage transmission lines. The voltage output unit can output a voltage signal to the corresponding voltage transmission line, and provide an input voltage to the display panel through the voltage transmission line.

[0087] The at least one voltage input port 403 is arranged side by side at the edge of the display panel. Generally, the power management module 401 may include a power management integrated circuit (PMIC, Power Management IC), which is the power supply core chip of the display panel and provides the on / off voltage of various switch elements. Optionally, the power management module 401 may also include circuits, interfaces, external wiring materials, etc. on the PCB board.

[0088] The at least one group of voltage transmission lines 402 and the at least one voltage input port 403 correspond one to one, and each group of voltage transmission lines is connected to the corresponding voltage input port.

[0089] The power management module 401 is used to execute the display panel driving method described in the above embodiments, and output a target voltage after voltage compensation to each voltage transmission line in at least one group of voltage transmission lines 402 .

[0090] Specifically, the power management module 401 can execute the corresponding display panel driving method for each voltage transmission line, and output the corresponding target voltage to the corresponding voltage transmission line. As an example, the power management module 401 may include at least one PMIC, each PMIC includes a voltage output unit, executes the corresponding display panel driving method for a group of voltage transmission lines, and outputs the adjusted target voltage to the corresponding voltage transmission line. The power management module 401 may also include a PMIC, each PMIC may include multiple voltage output units, and each voltage output unit may output the adjusted target voltage to the corresponding voltage transmission line.

[0091] Each group of voltage transmission lines in the at least one group of voltage transmission lines 402 is used to receive a corresponding target voltage and provide the target voltage to the display panel through a corresponding voltage input port.

[0092] The display panel driving circuit provided in the embodiment of the present application, by setting a power management module 401, at least one group of voltage transmission lines 402 and at least one voltage input port 403, realizes automatic compensation for the voltage drop caused by the line resistance according to the actual operation of the display panel and the different line resistances of different voltage transmission lines, so that the various voltage values ​​output by the power management module 401 to the display panel reach the required operation voltage. The circuit outputs the compensated voltage to different positions on the display panel, so that the input voltages received at different positions on the display panel remain consistent, avoiding the display panel receiving different input voltages due to differences in voltage transmission distances, thereby improving the stability of the display panel display image and reducing the risk of failure due to voltage abnormalities.

[0093] In some optional implementations of this embodiment, each group of voltage transmission lines in the at least one group of voltage transmission lines 402 has a line resistance related to the line length, and the line resistance of each group of voltage transmission lines is greater than or equal to a preset resistance value.

[0094] Specifically, Figure 4 As shown, due to the different spatial positions of the various voltage input ports on the actual panel, the line lengths of the voltage transmission lines corresponding to each voltage input port are different, which in turn leads to different line resistances of each group of voltage transmission lines. Therefore, the line resistance of a voltage transmission line can be estimated according to the length of the voltage transmission line. If the line resistance is greater than or equal to the preset resistance value, the input voltage can be adjusted for the voltage transmission line, that is, voltage compensation can be performed for the voltage transmission line. For example, for the voltage input ports arranged at both ends of the display panel, the line length of the corresponding voltage transmission line is the longest, and a target voltage with a larger output voltage value can be output accordingly. For the voltage input port arranged in the middle of the display panel, the line length of the corresponding voltage transmission line is shorter, and a target voltage with a smaller output voltage value can be output accordingly.

[0095] By performing voltage compensation on voltage transmission lines with line resistance greater than or equal to a preset resistance value and not performing voltage compensation on voltage transmission lines with line resistance less than the preset resistance value, the circuit structure can be simplified and the cost of circuit design and manufacturing can be reduced.

[0096] In some optional implementations of this embodiment, such as Figure 5As shown, the power management module 401 may include a current detection unit 4012 and a current source unit 4013. The current detection unit 4012 and the current source unit 4013 are both connected to each group of voltage transmission lines in at least one group of voltage transmission lines 402. The current detection unit 4012 is used to detect the magnitude of the first current output by the power management module 401 to the voltage transmission line to obtain a current detection signal. Optionally, when there are multiple groups of voltage transmission lines, each group of voltage transmission lines may correspond to one current detection unit 4012, or one current detection unit 4012 may correspond to multiple groups of voltage transmission lines, that is, the current detection unit 4012 is connected to each voltage transmission line in sequence, and the first current on the input end of each group of voltage transmission lines is collected in sequence.

[0097] like Figure 5 As shown, the current detection unit 4012 can be arranged on the path between the voltage output unit and the voltage transmission line. As an example, the current detection unit 4012 can be implemented by a current detection chip, or a shunt circuit can be used to collect part of the current, and then the current value of the first current transmitted by the voltage transmission line is calculated according to the proportional coefficient of the shunt circuit and the collected current value. The current detection unit 4012 can include a detection signal output terminal, and the current detection signal is transmitted to the current source unit 4013 through the detection signal output terminal.

[0098] The current detection signal may be a digital signal, an analog signal, or any other type of signal. For example, the current detection signal may be a binary digital signal, which indicates the magnitude of the drive current; or the current detection signal may be an analog voltage signal, which indicates the magnitude of the drive current.

[0099] The current source unit 4013 is used to output a second current in a preset proportion to the first current to the corresponding voltage transmission line according to the current detection signal.

[0100] For example, let the magnitude of the first current be I, the magnitude of the detection current be k*I, and k be a preset ratio. The current source unit 4013 can be implemented in various ways. For example, a programmable current source chip can be used to output the function of the second current according to the current detection signal, or a constant current source circuit composed of components such as an operational amplifier and a feedback resistor can be used to output the corresponding second current according to the current detection signal.

[0101] This embodiment realizes detection of the first current transmitted on each group of voltage transmission lines by setting a current detection unit and a current source unit, and outputs a corresponding second current to the voltage transmission line according to the detected current, thereby providing a stable and accurate second current to the voltage transmission line, which helps to use the second current to more accurately detect the voltage drop caused by the line resistance.

[0102] In some optional implementations of this embodiment, such as Figure 5 As shown, the power management module 401 may include a voltage detection unit 4014, which is connected to each voltage output unit in at least one voltage output unit. The voltage detection unit 4014 is used to detect the voltage on each voltage transmission line in at least one group of voltage transmission lines to obtain a voltage detection signal.

[0103] Among them, the voltage detection signal represents the voltage change formed by the second current applied to the line resistance of the corresponding voltage transmission line. Optionally, in order to be able to detect the detection voltage using a detection tool, the above-mentioned second current can be set to an AC signal, and accordingly, the detection voltage is also an AC signal. Therefore, the detection voltage can be determined by detecting the amplitude of the second AC signal. Optionally, the second current can also be a DC signal. The above-mentioned voltage detection unit 4014 can first detect the voltage at the input end of the voltage transmission line before the current source unit 4013 outputs the second current. After the current source unit 4013 outputs the second current, the voltage at the input end of the voltage transmission line is detected again. The difference between the two detected voltages can be used as the detection voltage.

[0104] The voltage detection signal may be a digital signal, an analog signal, or any other type of signal. For example, the voltage detection signal may be a binary digital signal, which indicates the magnitude of the detection voltage; or the voltage detection signal may be an analog voltage signal, which indicates the magnitude of the detection voltage.

[0105] Each of the at least one voltage output unit can determine the compensation voltage output to the voltage transmission line according to the voltage detection signal, and adjust the voltage output to the voltage transmission line to the target voltage according to the compensation voltage. For the content of adjusting the voltage output to the voltage transmission line, reference can be made to the above method embodiment, which will not be repeated here.

[0106] This embodiment realizes accurate detection of the voltage change caused by the second current on the voltage transmission line by providing a voltage detection unit, so as to more accurately determine the compensation voltage for the voltage transmission line according to the detected voltage.

[0107] In some optional implementations of this embodiment, the current source unit 4013 is further configured to output a second current in an alternating current form with a preset frequency.

[0108] The ratio of the amplitude of the second current in the form of AC to the first current is a preset ratio. Specifically, if the first current is I and the preset ratio is k, the amplitude ΔI=k*I, the highest value of the second current is +k*I, and the lowest value is -k*I. k can be set to any value, such as 2%. The frequency of the AC detection current can be set arbitrarily, such as 100Hz.

[0109] like Figure 6 As shown, it shows the equivalent circuit of the current source unit 4013 and the line resistance, wherein ΔI is the amplitude of the AC current and ΔV is the corresponding AC detection voltage.

[0110] In this embodiment, the current source unit 4013 outputs an AC detection current, which can achieve the superposition of the first current and the second current, so that a corresponding AC voltage signal can be generated on the line resistance. The AC voltage signal can be directly read by a detection tool, and the compensation voltage can be calculated based on the AC voltage signal, thereby improving the efficiency of determining the compensation voltage.

[0111] In some optional implementations of this embodiment, the second current is a square wave current signal with a preset frequency.

[0112] like Figure 2 , which shows a second current in the form of a square wave, Figure 2 The I in the figure represents the first circuit, ΔI is the amplitude of the square wave, and the amplitude in the figure is 2%*I.

[0113] In this embodiment, by setting the waveform of the second current to a square wave, it is only necessary to output the set current according to the timing. This implementation method is simple, helps to reduce the difficulty of generating the second current, and improves the efficiency of configuring the circuit.

[0114] In some optional implementations of this embodiment, the voltage detection unit 4014 is further used for:

[0115] The amplitude of the AC detection voltage output to the input end of the voltage transmission line is detected, and the AC detection voltage is formed by applying the second current in the form of AC to the line resistance of the voltage transmission line.

[0116] Specifically, assuming that the amplitude of the AC detection voltage is ΔI, according to the formula ΔI*R=ΔV, the amplitude of the AC detection voltage is proportional to the amplitude of the second current in the AC form, that is, the waveform of the AC detection voltage is the same as the waveform of the second current in the AC form. If the waveform of the second current in the AC form is Figure 2 If it is a square wave as shown, the waveform of the AC detection voltage is also a square wave.

[0117] This embodiment detects the amplitude of the AC detection voltage, thereby realizing that the waveform of the AC detection voltage can be detected directly from the output end of the power management module, and the amplitude of the low voltage can be read. The compensation voltage can be determined based on the amplitude, thereby improving the efficiency and accuracy of determining the compensation voltage.

[0118] In some optional implementations of this embodiment, the power management module 401 is further used to determine the compensation voltage output to the voltage transmission line according to the amplitude and preset ratio of the AC detection voltage, and adjust the voltage output to the corresponding voltage transmission line to the target voltage according to the compensation voltage.

[0119] Specifically, in Figure 6 In the equivalent circuit shown, the following formula can be obtained: ΔV=ΔI*R=k*I*R=k*(V1-V2), where ΔV is the amplitude of the AC detection voltage, V1 is the voltage received by a certain voltage transmission line, and V2 is the voltage output by the voltage transmission line. After detecting ΔV, the voltage drop across the voltage transmission line can be calculated according to the formula. For example, if k=2%, then (V1-V2)=50*ΔV, and the compensation voltage can be 50*ΔV, that is, adding 50*ΔV on the basis of V1 can make the voltage output by the voltage transmission line close to V1.

[0120] This embodiment can quickly obtain the compensation voltage by using the preset ratio and the amplitude of the detected AC detection voltage for calculation, so that the output voltage of the power management module 401 can be efficiently and accurately adjusted according to the compensation voltage, thereby improving the accuracy and efficiency of voltage compensation.

[0121] In some optional implementations of this embodiment, such as Figure 7 As shown, the circuit further includes at least one decoupling capacitor 404, and each of the at least one decoupling capacitor has one end connected to the corresponding voltage input port and the other end grounded.

[0122] Since the second current can be an AC current, in order to keep the driving voltage output by the voltage transmission line at a stable DC voltage, a decoupling capacitor can be set in the voltage transmission line to filter the AC signal, thereby providing a stable DC voltage to the display panel and improving the stability of the display panel operation.

[0123] In some optional implementations of the present embodiment, each group of voltage transmission lines in the at least one group of voltage transmission lines 402 includes a chip-on-chip film, and each group of voltage transmission lines is connected to a corresponding voltage input port through the chip-on-chip film.

[0124] Among them, Chip on Film (COF) is a soft film packaging technology that fixes the integrated circuit on a flexible circuit board, uses a soft additional circuit board as a packaging chip carrier, combines the chip with the flexible substrate circuit, and realizes the transmission of signals and data. Figure 4 As shown, each voltage input port on the display panel is connected to the COF, and connected to the power management module 401 through the COF.

[0125] This embodiment provides a corresponding voltage compensation function for the chip-on-chip film of the display panel, thereby providing a stable driving voltage for the display panel and providing display stability for the display panel in view of the structural characteristics of the display panel.

[0126] Figure 8 A schematic diagram of the structure of a display device 800 provided in an embodiment of the present application is shown in FIG. Figure 8 As shown, the display device 800 includes: a display panel 801, a control mainboard 802 and the display panel driving circuit 400 described in the above embodiment;

[0127] The power management module included in the display panel driving circuit is arranged on the control mainboard; each of the at least one group of voltage transmission circuits included in the display panel driving circuit has one end connected to the control mainboard and the other end connected to the corresponding voltage input port.

[0128] The display panel driving circuit includes at least one voltage input port arranged side by side at the edge of the display panel, and each voltage input port is used to receive an input voltage from a corresponding voltage transmission line and transmit the input voltage to the display panel.

[0129] The above-mentioned control main board can connect the R / G / B three-color compression signals, control signals and driving voltage signals to the connectors on the left and right PCB boards (XL Board and XR Board) through wires (such as flexible flat cables FFC (Flexible Flat Cable)). After the signals are processed by the timing controller TCON (Timing Controller) chip on the PCB board, they pass through the PCB board and the voltage input port on the display panel to provide stable voltage and other signals to the display panel.

[0130] The display device provided in the embodiment of the present application, by setting the above-mentioned display panel driving circuit, realizes automatic compensation for the voltage drop caused by the line resistance of the wire according to the actual operation of the display panel, so that the voltage output by the voltage transmission line to the display panel reaches the required operation voltage, which helps to improve the stability of the display panel operation and reduce the failure rate.

[0131] The professionals should further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different circuits to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0132] The steps of the circuits or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, software modules executed by a processor, or a combination of the two. The software modules may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0133] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The circuit steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0134] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A display panel driving method, characterized in that: The display panel driving method comprises: determining a current value of a first current on a voltage transmission line connected to the display panel; Based on the current value, outputting a second current in a preset proportion to the first current to the voltage transmission line; Determine the magnitude of the voltage on the input end of the voltage transmission line to obtain a detection voltage value, wherein the detection voltage is a voltage change formed by the second current being applied to the line resistance of the voltage transmission line; determining a compensation voltage output to the display panel according to the detected voltage value; According to the compensation voltage, the voltage output to the display panel is adjusted to a target voltage.

2. The method according to claim 1, characterized in that: The step of outputting a second current in a preset proportion to the first current to the voltage transmission line based on the current value includes: Based on the current value, a second current in an alternating current form with a preset frequency is output to the voltage transmission line, wherein a ratio of an amplitude of the second current to a current value of the first current is the preset ratio.

3. The method according to claim 2, characterized in that The step of outputting a second current in an alternating current form with a preset frequency to the voltage transmission line based on the current value comprises: Based on the current detection signal, a second current having a square wave waveform and a preset frequency is output to the voltage transmission line.

4. The method according to claim 2 or 3, characterized in that: The step of determining the voltage at the input end of the voltage transmission line to obtain a detection voltage value includes: The amplitude of the AC detection voltage output to the input end of the voltage transmission line is determined to obtain a detection voltage value representing the amplitude, wherein the AC detection voltage is formed by applying the second current in the AC form to the line resistance of the voltage transmission line.

5. The method according to claim 4, characterized in that The step of adjusting the voltage output to the display panel to a target voltage according to the compensation voltage includes: A compensation voltage output to the display panel is determined according to the amplitude of the AC detection voltage and the preset ratio.

6. A display panel driving circuit, characterized in that: The circuit comprises: a power management module, at least one group of voltage transmission lines and at least one voltage input port, wherein the power management module comprises at least one voltage output unit, each of the at least one voltage output unit is connected to a corresponding group of voltage transmission lines; the at least one voltage input port is arranged side by side at the edge of the display panel; The at least one group of voltage transmission lines corresponds to the at least one voltage input port one by one, and each group of voltage transmission lines is connected to the corresponding voltage input port; The power management module is used to execute the display panel driving method according to any one of claims 1 to 5, and output a target voltage after voltage compensation to each group of voltage transmission lines in the at least one group of voltage transmission lines; Each group of voltage transmission lines in the at least one group of voltage transmission lines is used to receive a corresponding target voltage and provide the target voltage to the display panel through a corresponding voltage input port.

7. The driving circuit according to claim 6, characterized in that: Each group of voltage transmission lines in the at least one group of voltage transmission lines has a line resistance related to the line length, and the line resistance of each group of voltage transmission lines is greater than or equal to a preset resistance value.

8. The driving circuit according to claim 6, characterized in that: The power management module comprises a current detection unit and a current source unit, wherein the current detection unit and the current source unit are both connected to each group of voltage transmission lines in the at least one group of voltage transmission lines; The current detection unit is used to detect the magnitude of a first current output to each group of voltage transmission lines in the at least one group of voltage transmission lines to obtain a current detection signal; The current source unit is used to output a second current in a preset proportion to the first current to a corresponding voltage transmission line according to the current detection signal.

9. The driving circuit according to claim 6, characterized in that: The power management module includes a voltage detection unit, and the voltage detection unit is connected to each voltage output unit of the at least one voltage output unit; The voltage detection unit is used to detect the voltage on each group of voltage transmission lines in the at least one group of voltage transmission lines to obtain a voltage detection signal, wherein the voltage detection signal represents a voltage change amount formed by the second current being applied to the line resistance of the corresponding voltage transmission line; Each voltage output unit of the at least one voltage output unit is used to determine a compensation voltage output to a corresponding voltage transmission line according to the voltage detection signal, and adjust the voltage output to the voltage transmission line to a target voltage according to the compensation voltage.

10. A display device, characterized in that: include: A display panel, a control mainboard and a display panel driving circuit as described in any one of claims 6 to 9; The power management module included in the display panel driving circuit is arranged on the control mainboard; each of the at least one group of voltage transmission lines included in the display panel driving circuit has one end connected to the control mainboard and the other end connected to the corresponding voltage input port; The display panel driving circuit includes at least one voltage input port arranged side by side at an edge of the display panel, and each voltage input port is used to receive an input voltage from a corresponding voltage transmission line and transmit the input voltage to the display panel.

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