Driving circuit of display panel and driving method thereof, display device

Abstract

The application discloses a driving circuit (00) and a driving method of a display panel (M1) and a display device, and belongs to the technical field of display. The driving circuit (00) comprises a power supply circuit (01), a switching circuit board (02) and a voltage regulating circuit (03). The switching circuit board (02) can transmit a power supply voltage (V_L0) provided by the power supply circuit (01) to a light emitting element (L0) in the display panel (M1). The voltage regulating circuit (03) can adjust the power supply voltage (V_L0) provided by the power supply circuit (01) based on an ideal working voltage of the light emitting element (L0) at a certain gray scale and a wire pressure drop of a wire (L1) coupled with the light emitting element (L0). The voltage regulating circuit (03) can flexibly adjust the power supply voltage (V_L0) provided by the power supply circuit (01) to the light emitting element (L0) based on the gray scale of a display picture of the display panel (M1). Therefore, the working power consumption of the display device can be effectively reduced, and the product yield can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular to a driving circuit of a display panel, a driving method thereof and a display device. BACKGROUND

[0002] Mini light emitting diode (Mini LED) is a sub-millimeter semiconductor light emitting diode capable of converting electrical energy into light energy, which has the advantages of high color saturation, high brightness and energy saving, and can be used as backlight or directly display as a light emitting element. The display device using Mini LED as a light emitting element can also be called Mini LED direct display display device.

[0003] In the related art, for the Mini LED direct display display device, an active matrix (AM) driving mode is usually used for driving. The Mini LED direct display display device generally includes a power supply circuit and a display panel provided with a plurality of Mini LEDs. The power supply circuit is coupled with the plurality of Mini LEDs and is configured to provide a fixed size voltage to each Mini LED to drive the Mini LED to emit light.

[0004] However, in the related art, the power consumption of the Mini LED direct display display device is high, and the product yield is poor. SUMMARY

[0005] The present disclosure provides a driving circuit of a display panel, a driving method thereof and a display device, which can solve the problem of high power consumption and poor product yield of the Mini LED direct display display device in the related art. The technical solution is as follows:

[0006] On the one hand, a driving circuit of a display panel is provided, the display panel includes a plurality of light emitting elements, and the driving circuit includes a power supply circuit, a conversion circuit board and a voltage adjusting circuit.

[0007] The power supply circuit is coupled with the conversion circuit board, and the power supply circuit is configured to transmit a power supply voltage to the conversion circuit board.

[0008] The conversion circuit board is further coupled with the plurality of light emitting elements through a wire, and the conversion circuit board is configured to transmit the power supply voltage to each light emitting element.

[0009] The voltage regulation circuit is coupled with the power supply circuit, and is configured to adjust a size of a supply voltage output by the power supply circuit according to an ideal working voltage corresponding to a working current of each of the light emitting elements at the target gray scale and a wire voltage drop on a wire coupled with each of the light emitting elements when the display panel displays a display picture of the target gray scale.

[0010] Optionally, the voltage regulation circuit comprises a master control chip and a voltage regulation sub-circuit.

[0011] The master control chip is coupled with the voltage regulation sub-circuit, and is configured to determine a target working voltage of each of the light emitting elements according to an ideal working voltage corresponding to a working current of each of the light emitting elements at the target gray scale and a wire voltage drop on a wire coupled with each of the light emitting elements, and transmit a feedback signal to the voltage regulation sub-circuit according to the target working voltage of each of the light emitting elements.

[0012] The voltage regulation sub-circuit is further coupled with the power supply circuit, and is configured to adjust the size of the supply voltage output by the power supply circuit according to the feedback signal.

[0013] Optionally, the feedback signal is a digital signal; and the voltage regulation sub-circuit comprises a digital-to-analog converter and a voltage regulation module.

[0014] The digital-to-analog converter is coupled with the master control chip and the voltage regulation module respectively, and is configured to convert the feedback signal into a voltage regulation signal and transmit the voltage regulation signal to the voltage regulation module, the voltage regulation signal being an analog signal.

[0015] The voltage regulation module is further coupled with the power supply circuit, and is configured to adjust the size of the supply voltage output by the power supply circuit according to the voltage regulation signal.

[0016] Optionally, the power supply circuit has a feedback pin and an output pin; and the voltage regulation module comprises a first voltage dividing resistor, a second voltage dividing resistor and a feedback resistor.

[0017] One end of the first voltage dividing resistor, one end of the second voltage dividing resistor and one end of the feedback resistor are coupled with the feedback pin of the power supply circuit.

[0018] The other end of the first voltage dividing resistor is coupled with the output pin of the power supply circuit, the other end of the second voltage dividing resistor is grounded, and the other end of the feedback resistor is coupled with the digital-to-analog converter.

[0019] Optionally, the supply voltage V_L0 output by the power supply circuit satisfies:

[0020] V_L0 = (1 + r10 / r20 + 1 / rfb) * Vfb - Vdac0 / rfb;

[0021] Wherein, r10 refers to the resistance value of the first voltage dividing resistor, r20 refers to the resistance value of the second voltage dividing resistor, rfb refers to the resistance value of the feedback resistor, Vfb refers to the voltage value of the feedback pin, and Vdac0 refers to the voltage value of the voltage regulation signal.

[0022] Optionally, the master control chip is configured to:

[0023] determine a target working voltage of each light emitting element by summing up a voltage drop on a wire coupled to each light emitting element and an ideal working voltage corresponding to a working current of each light emitting element at the target gray scale;

[0024] and transmit a feedback signal to the voltage regulation sub-circuit according to a maximum target working voltage among the determined target working voltages.

[0025] Optionally, the master control chip stores a volt-ampere characteristic curve corresponding to attribute information of each light emitting element, and the volt-ampere characteristic curve is configured to represent a mapping relationship between a working current of each light emitting element and an ideal working voltage of each light emitting element at the target gray scale; and the master control chip is further configured to:

[0026] obtain attribute information of each light emitting element;

[0027] determine an ideal working voltage corresponding to a working current of each light emitting element at the target gray scale according to a volt-ampere characteristic curve corresponding to attribute information of each light emitting element and the working current of each light emitting element at the target gray scale.

[0028] Optionally, the master control chip stores a gamma table, and the gamma table is configured to represent a mapping relationship between a display gray scale and a working current, the display gray scale referring to a gray scale of a picture displayed by the display panel.

[0029] The master control chip is further configured to search in the gamma table to determine the working current of each light emitting element at the target gray scale.

[0030] Optionally, the wire includes a first signal line and a second signal line.

[0031] The adapter circuit board is coupled with the first pole of each of the light emitting elements through the first signal line and coupled with the second pole of each of the light emitting elements through the second signal line; the adapter circuit board is configured to transmit the power supply voltage to each of the light emitting elements through the first signal line and transmit a pull-down power signal to each of the light emitting elements through the second signal line.

[0032] The master control chip is configured to determine a wire drop on a wire coupled with each of the light emitting elements as a sum of a first voltage drop on a first signal line coupled with each of the light emitting elements and a second voltage drop on a second signal line coupled with each of the light emitting elements.

[0033] Optionally, the adapter circuit board comprises a first circuit board and a second circuit board connected in a bundle, the first circuit board is coupled with the power supply circuit, and the second circuit board is coupled with the plurality of light emitting elements in a bundle through wires; the master control chip is configured to:

[0034] determine a first wire resistance on a first signal line coupled with each of the light emitting elements, a second wire resistance on a second signal line coupled with each of the light emitting elements, a bundle resistance of the bundle connection, and a third wire resistance in the second circuit board;

[0035] determine a first voltage drop on a first signal line coupled with each of the light emitting elements according to the first wire resistance, the bundle resistance, and the third wire resistance;

[0036] determine a second voltage drop on a second signal line coupled with each of the light emitting elements according to the second wire resistance, the bundle resistance, and the third wire resistance.

[0037] Optionally, the display panel comprises n rows and m columns of light emitting elements.

[0038] For a light emitting element located at the i-th row and the j-th column, the first voltage drop V_IRdrop_V_ij satisfies:

[0039] For a light emitting element located at the i-th row and the j-th column, the second voltage drop V_IRdrop_GND_ij satisfies:

[0040]

[0041] wherein n, m, i, and j are all integers greater than 0, i is less than or equal to n, j is less than or equal to m, I ijis the working current of the light emitting element in the ith row and the jth column, r_PCB_Bonding is the bonding resistance of the bonding of the first circuit board and the second circuit board on the first signal line bonding side, r_PCB_Bonding' is the bonding resistance of the bonding of the first circuit board and the second circuit board on the second signal line bonding side, r_FPC is the resistance of the third trace in the second circuit board on the first signal line bonding side, r_FPC' is the resistance of the third trace in the second circuit board on the second signal line bonding side, r_Bonding is the bonding resistance of the second circuit board and the first signal line, r_Bonding' is the bonding resistance of the second circuit board and the second signal line, r_Fanout is the fanout resistance of the first signal line fanout part, r_Fanout' is the fanout resistance of the second signal line fanout part, ri is the first trace resistance of the first signal line, and ri' is the second trace resistance of the second signal line.

[0042] Optionally, the master control chip is a micro control unit (MCU).

[0043] Optionally, the power supply circuit is a direct current-direct current (DC-DC) power supply circuit.

[0044] Optionally, the light emitting element is a micro light emitting diode (Mini LED).

[0045] In another aspect, a driving method of a display panel is provided, which is applied to a voltage adjusting circuit included in the driving circuit as described in the above aspect, and the method comprises:

[0046] When the display panel displays a display picture of a target gray scale, the ideal working voltage of each light emitting element is determined according to the working current of each light emitting element at the target gray scale;

[0047] The trace voltage drop on the trace coupled with each light emitting element is determined.

[0048] The size of the power supply voltage output by the power supply circuit included in the driving circuit is adjusted according to the ideal working voltage of each light emitting element and the trace voltage drop on the trace coupled with each light emitting element.

[0049] In yet another aspect, a display device is provided, which comprises a display panel and a driving circuit as described in the above aspect, and the display panel comprises a plurality of light emitting elements.

[0050] The driving circuit is coupled with the plurality of light emitting elements in the display panel and is configured to transmit a power supply voltage to each light emitting element.

[0051] In summary, the technical scheme provided by the embodiments of the present disclosure has at least the following beneficial effects:

[0052] Provided are a driving circuit of a display panel, a driving method of the driving circuit, and a display device. The driving circuit comprises a power supply circuit, an adapter circuit board, and a voltage adjustment circuit. The adapter circuit board is capable of transmitting a power supply voltage provided by the power supply circuit to a light emitting element in the display panel. The voltage adjustment circuit is capable of adjusting the power supply voltage provided by the power supply circuit based on an ideal working voltage of the light emitting element at a certain gray scale and a wire voltage drop of a wire to which the light emitting element is coupled. That is, the voltage adjustment circuit is capable of flexibly adjusting the power supply voltage provided by the power supply circuit to the light emitting element based on the gray scale of a displayed image of the display panel. In this way, the working power consumption of the display device can be effectively reduced, and the product yield can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0054] Figure 1 is a structural schematic diagram of a driving circuit of a display panel provided by an embodiment of the present disclosure;

[0055] Figure 2 is a structural schematic diagram of another driving circuit of a display panel provided by an embodiment of the present disclosure;

[0056] Figure 3 is a structural schematic diagram of still another driving circuit of a display panel provided by an embodiment of the present disclosure;

[0057] Figure 4 is a structural schematic diagram of yet another driving circuit of a display panel provided by an embodiment of the present disclosure;

[0058] Figure 5 is a schematic diagram of a volt-ampere characteristic curve provided by an embodiment of the present disclosure;

[0059] Figure 6 is an equivalent resistance schematic diagram provided by an embodiment of the present disclosure;

[0060] Figure 7 is a partial structural schematic diagram of a driving circuit of a display panel provided by an embodiment of the present disclosure;

[0061] Figure 8 is a partial structural schematic diagram of another driving circuit of a display panel provided by an embodiment of the present disclosure;

[0062] Figure 9is a flow chart of a driving method of a display panel provided by an embodiment of the present disclosure.

[0063] Figure 10 is a flow chart of another driving method of a display panel provided by an embodiment of the present disclosure.

[0064] Figure 11 is a structural schematic diagram of a display device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] For the purpose, technical solutions and advantages of the present disclosure to be clearer, the embodiments of the present disclosure will be described in further detail below with reference to the drawings.

[0066] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the usual meaning understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second" or "third" and similar terms used in the specification and claims of the present patent application do not represent any order, number or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar terms also do not represent a quantity limitation, but represent the existence of at least one. The terms "include" or "contain" and similar terms mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left" or "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Connected" or "coupled" means electrical connection.

[0067] Figure 1 is a driving circuit of a display panel provided by an embodiment of the present disclosure. As shown in Figure 1 , the display panel M1 includes a plurality of light emitting elements L0. The driving circuit 00 includes a power supply circuit 01, a conversion circuit board 02 and a voltage regulation circuit 03.

[0068] The power supply circuit 01 is coupled with the conversion circuit board 02. The power supply circuit 01 is used to transmit a power supply voltage V_L0 to the conversion circuit board 02.

[0069] The conversion circuit board 02 is also coupled with the plurality of light emitting elements L0 through the wire L1. The conversion circuit board 02 is used to transmit the power supply voltage V_L0 to each light emitting element L0. That is, the conversion circuit board 02 can be used as a conversion signal circuit board to indirectly transmit the power supply voltage V_L0 provided by the power supply circuit 01 to the light emitting element L0.

[0070] For example, referring to Figure 1 , the plurality of light emitting elements L0 included in the display panel M1 can be arranged in an array, i.e., in a row-column arrangement. The light emitting elements L0 located in the same column can be coupled to the adapter circuit board 02 through a wire L1, and the light emitting elements L0 located in different columns can be coupled to the adapter circuit board 02 through different wires L1.

[0071] The voltage regulation circuit 03 is coupled to the power supply circuit 01. The voltage regulation circuit 03 is configured to dynamically adjust the magnitude of the supply voltage V_L0 output by the power supply circuit 01 according to the ideal operating voltage V_LED corresponding to the operating current of each light emitting element L0 at a target gray scale, and the wire voltage drop V_IR drop on the wire L1 coupled to each light emitting element L0 when the display panel M1 displays a display image at the target gray scale. That is, the voltage regulation circuit 03 can control the magnitude of the supply voltage V_L0 provided by the power supply circuit 01 to the light emitting element L0 according to the display gray scale (e.g., the target gray scale) of the current display image displayed by the display panel M1.

[0072] For example, if the target gray scale is small, i.e., the display panel M1 is in low gray scale display, the voltage regulation circuit 03 can reduce the supply voltage V_L0 output by the power supply circuit 01 to reduce the operating power consumption of the display panel. If the target gray scale is large, i.e., the display panel M1 is in high gray scale display, the voltage regulation circuit 03 can increase the supply voltage V_L0 output by the power supply circuit 01 to ensure reliable display of the display panel M1. Thus, compared with the related art in which the supply voltage V_L0 provided by the power supply circuit 01 is not adjustable, the operating power consumption of the display panel M1 can be effectively reduced while ensuring normal display.

[0073] In summary, the display panel driving circuit provided by the embodiments of the present disclosure includes a power supply circuit, an adapter circuit board, and a voltage regulation circuit. The adapter circuit board can transmit the supply voltage provided by the power supply circuit to the light emitting elements in the display panel. The voltage regulation circuit can adjust the supply voltage provided by the power supply circuit based on the ideal operating voltage of the light emitting element at a certain gray scale and the wire voltage drop of the wire coupled to the light emitting element. That is, the voltage regulation circuit can flexibly adjust the supply voltage provided by the power supply circuit to the light emitting element based on the gray scale of the display image displayed by the display panel. Thus, the operating power consumption of the display device can be effectively reduced, and the product yield can be improved.

[0074] Figure 2 is another structural schematic diagram of a display panel driving circuit provided by the embodiments of the present disclosure. As Figure 2As shown, the adapter circuit board 02 according to the embodiments of the present disclosure can include a first circuit board 021 and a second circuit board 022 which are coupled by bonding. The first circuit board 021 can be coupled with the power supply circuit 01, and the second circuit board 022 can be coupled with the plurality of light emitting elements L0 by bonding through the wire L1.

[0075] With continued reference to Figure 2 As can be seen, in the embodiments of the present disclosure, each light emitting element L0 can have a first pole and a second pole, and among the first pole and the second pole, one pole can be a positive pole (+) and the other pole can be a negative pole (-). The embodiments of the present disclosure are described by taking an example in which the first pole is the positive pole and the second pole is the negative pole. The wire L1 coupled with the light emitting element L0 can include a first signal line L11 and a second signal line L12.

[0076] The adapter circuit board 02 can be coupled with the first pole of each light emitting element L0 through the first signal line L11, and can be coupled with the second pole of each light emitting element L0 through the second signal line L12. The adapter circuit board 02 can be configured to transmit the supply voltage V_L0 to each light emitting element L0 through the first signal line L11, and transmit a pull-down power supply signal to each light emitting element L0 through the second signal line L12.

[0077] Here, the second circuit board 022 included in the adapter circuit board 02 can be coupled with the light emitting element L0 through the first signal line L11 and the second signal line L12. Accordingly, the power supply circuit 01 can transmit the supply voltage V_L0 generated by the first circuit board 021 to the second circuit board 022, and the second circuit board 022 can transmit the supply voltage V_L0 to each light emitting element L0 through the first signal line L11. In addition, the second circuit board 022 can transmit a pull-down power supply signal to each light emitting element L0 through the second signal line L12.

[0078] Optionally, the voltage of the pull-down power supply signal can be a fixed voltage, such as a signal provided by the ground terminal GND. In other words, each light emitting element L0 can be grounded through the second signal line L12, and the ground terminal GND can be a terminal in the second circuit board 022. The embodiments described below of the present disclosure are described by taking an example in which each light emitting element L0 is grounded through the second signal line L12.

[0079] On the basis of the above embodiments, it can be known that the power supply circuit 01 provided by the display panel M1 according to the embodiments of the present disclosure can provide a supply voltage V_L0, which can be a voltage to be transmitted to the first electrode of the light emitting element L0. The voltage adjustment circuit 03 can determine a target supply voltage V_LED to be loaded to the two electrodes (i.e., the first electrode and the second electrode) of the light emitting element L0 according to an ideal working voltage V_LED corresponding to the working current of each light emitting element L0 at the target gray scale and a voltage drop V_IR drop on the wire L1 coupled with each light emitting element L0, i.e., determine the voltage difference of the two electrodes of the light emitting element L0. Then, the voltage adjustment circuit 03 can subtract a predetermined fixed voltage transmitted to the second electrode of the light emitting element L0 from the determined voltage difference, so as to obtain the voltage to be loaded to the first electrode of the light emitting element L0, and adjust the size of the supply voltage V_L0 output by the power supply circuit 01 according to the determined voltage. Specifically, the voltage adjustment circuit 03 can control the power supply circuit 01 to output the voltage determined by the voltage adjustment circuit 03 to be loaded to the first electrode of the light emitting element L0. It should be noted that, for the signal provided by the ground terminal GND, the voltage is generally 0, so the target supply voltage V_LED determined by the voltage adjustment circuit 03 can also be considered as the voltage to be loaded to the first electrode of the light emitting element L0. Correspondingly, the voltage adjustment circuit 03 can control the power supply circuit 01 to output a supply voltage V_L0 with the same size as the target supply voltage V_LED, i.e., control the power supply circuit 01 to provide the light emitting element L0 with the target supply voltage V_LED.

[0080] Figure 3 is another structure schematic diagram of a driving circuit of a display panel provided by the embodiments of the present disclosure. Referring to Figure 3 It can be seen that the power supply circuit 01 according to the embodiments of the present disclosure can be a direct circuit (DC-DC) power supply circuit 01. The first circuit board 021 can be a hard printed circuit board (PCB), which is denoted as XPCB in the figure. The second circuit board 022 can be a flexible printed circuit (FPC). The light emitting element L0 can be a micro light emitting diode (Mini LED).

[0081] Optionally, the plurality of light emitting elements L0 included in the display panel M1 can be divided into a plurality of red (R) light emitting elements R_L0, green (G) light emitting elements G_L0 and blue (B) light emitting elements B_L0 according to colors. As shown in Figure 3 In the column direction, the red light emitting elements R_L0, the green light emitting elements G_L0 and the blue light emitting elements B_L0 can be arranged in sequence. In addition, Figure 3The positive and negative electrodes of each light emitting element L0 are also identified. For example, the red light emitting element R_L0 has a positive electrode R+ and a negative electrode R-; the green light emitting element G_L0 has a positive electrode G+ and a negative electrode G-; and the blue light emitting element B_L0 has a positive electrode B+ and a negative electrode B-. Of course, in some other embodiments, other color light emitting elements, such as white light emitting elements, can also be included on the display panel M1. In addition, the red light emitting element R_L0, the green light emitting element G_L0 and the blue light emitting element B_L0 can also be arranged in other ways.

[0082] In the field of Mini LED display, the difference between the power supply voltages V_L0 provided to the blue light emitting element B_L0 and the green light emitting element G_L0 is small, so the reference Figure 3 The red light emitting elements R_L0 in the same column can be coupled to the same first signal line L11, and the green light emitting elements L0 and the blue light emitting elements L0 in the same column can be coupled to the same first signal line L11. The power supply circuit 01 can provide a power supply voltage V R to each red light emitting element R_L0, and the same power supply voltage V GB to the blue light emitting element B_L0 and the green light emitting element G_L0. It should be noted that Figure 3 The second signal line L12 is not shown, and the coupling relationship between the first signal line L11 and the second circuit board 022 is not shown.

[0083] Optionally, considering that the display panel M1 is currently large in size and high in resolution, the driving circuit generally includes a plurality of FPCs 022, each FPC 022 is coupled to a plurality of light emitting elements L0 on the display panel M1, and the light emitting elements L0 connected by each FPC are different. The XPCB 021 can be coupled to each FPC 022. For example, referring to Figure 3 which shows two FPCs 022.

[0084] In addition, by providing a plurality of FPCs 022, the number of wires L1 coupled to each FPC 022 can be reduced, that is, only a small number of light emitting elements L0 are transmitted signals (such as power supply voltage V_L0). In this way, the probability of signal crosstalk can be reduced, and the signal transmission reliability can be improved. In addition, because the number of wires L1 coupled to each FPC 022 is small, the length of each wire L1 can be correspondingly set to be short, thereby avoiding a large difference in wire voltage drop V_IRdrop of wires connected to different light emitting elements L0.

[0085] In addition, referring to Figure 3It can also be seen that the driving circuit of the display panel can further include an integrated circuit chip (IC) and a plurality of micro ICs (MICs). Optionally, the integrated circuit chip can be packaged by a chip on film (COF).

[0086] The integrated circuit chip can be coupled with the plurality of MICs, and each MIC can be coupled with at least one light emitting element L0 through a pin (also referred to as a pin foot) to form a signal loop with the at least one light emitting element L0. The integrated circuit chip can provide a data signal DATA to the corresponding light emitting element L0 through each MIC to drive the light emitting element L0 to display a corresponding gray scale brightness, and the data signal DATA can be received from a timing controller (not shown in the figure) coupled with a first circuit board 021. In addition, the negative electrode of each light emitting element L0 can also be coupled with the VCC power supply end through the pin to receive a power supply signal provided by the VCC power supply end. Figure 3 The black filled square represents the pin.

[0087] Figure 4 is another structure diagram of a driving circuit of a display panel provided by an embodiment of the present disclosure. As shown in Figure 4 The voltage adjustment circuit 03 can include a master chip 031 and a voltage adjustment sub-circuit 032. The master chip 031 can be a microcontroller unit (MCU).

[0088] The master chip 031 can be coupled with the voltage adjustment sub-circuit 032. The master chip 031 can be used to determine a target working voltage VLED of each light emitting element L0 according to an ideal working voltage V_LED corresponding to the working current of each light emitting element L0 at the target gray scale and a wire pressure drop V_IR drop on the wire L1 coupled with each light emitting element L0, and can be used to transmit a feedback signal FB to the voltage adjustment sub-circuit 032 according to the target working voltage VLED of each light emitting element L0.

[0089] The voltage adjustment sub-circuit 032 can also be coupled with the power supply circuit 01. The voltage adjustment sub-circuit 032 can be used to adjust the size of the power supply voltage V_L0 output by the power supply circuit 01 according to the received feedback signal FB. For example, so that the size of the power supply voltage V_L0 is the same as the size of the target working voltage VLED.

[0090] Optionally, in the embodiment of the present disclosure, the main control chip 031 can store a Gamma table and a voltage-current characteristic curve corresponding to the attribute information of each light emitting element L0. The Gamma table is configured to represent the mapping relationship between the display gray scale and the working current, and the display gray scale can refer to the gray scale of the display picture required to be displayed by the display panel M1. The voltage-current characteristic curve is configured to represent the mapping relationship between the working current of each light emitting element L0 and the ideal working voltage V_LED of each light emitting element L0 at the target gray scale. In addition, for each light emitting element L0, the attribute information of the light emitting element L0 can refer to the information classified according to the photoelectric characteristics of the light emitting element L0 at the factory, and each class can be referred to as a Bin level. The Bin value corresponding to each Bin level can include a voltage-current characteristic curve, and different Bin levels correspond to different voltage-current characteristic curves.

[0091] On the basis of the above-mentioned embodiment, first, the main control chip 031 can be used to look up in the Gamma table to determine the working current of each light emitting element L0 at the target gray scale. Then, the main control chip 031 can obtain the attribute information (i.e., the Bin level) of each light emitting element L0, and determine the ideal working voltage V_LED corresponding to the working current of each light emitting element L0 at the target gray scale according to the voltage-current characteristic curve corresponding to the attribute information of each light emitting element L0 and the working current of each light emitting element L0 at the target gray scale.

[0092] For example, taking 7 Bin levels Bin1 to Bin7 as an example, Table 1 shows a representative voltage value in the voltage-current characteristic curve corresponding to each Bin level. The representative voltage value can refer to the maximum voltage value, the minimum voltage value, or the average voltage value in the voltage-current characteristic curve corresponding to the Bin level. For example, the representative voltage value corresponding to Bin1 is 2.6 volts (V), and the representative voltage value corresponding to Bin2 is 2.65V. It can be further seen from the different representative voltage values corresponding to different Bin levels that the voltage-current characteristic curves corresponding to different Bin levels are different. In addition, Figure 5 Fig. 4 shows the voltage-current characteristic curve corresponding to one of the 7 Bin levels shown in Table 1. The abscissa represents the working current If of the light emitting element L0, and the unit is milliampere (mA); the ordinate represents the ideal working voltage V_LED corresponding to the working current If, Figure 5 which is denoted by Vf and has a unit of V.

[0093] Table 1

[0094] Bin 1 2.6 Bin 2 2.65 Bin 3 2.7 Bin 4 2.75 Bin 5 2.8 Bin 6 2.85 Bin 7 2.9

[0095] For example, assuming that the master chip 031 finds in the Gamma table that the working current of a certain light emitting element L0 at the current target gray scale is 15 mA, and the voltage-current characteristic curve corresponding to the Bin level of the light emitting element L0 is as shown in FIG. 3B, then the master chip 031 can determine the ideal working voltage V LED of the light emitting element L0 based on the found working current "15 mA" and the voltage-current characteristic curve, and the ideal working voltage V LED of the light emitting element L0 is about 3.1 V. Figure 5 Figure 5 The voltage-current characteristic curve shown in FIG. 3B can determine that the ideal working voltage V LED of the light emitting element L0 is about 3.1 V.

[0096] Of course, in some other embodiments, the Gamma table can also be stored in an integrated circuit chip, and the integrated circuit chip can also be coupled with the master chip 031. Correspondingly, the working current of each light emitting element L0 at the target gray scale can be found in the Gamma table by the integrated circuit chip, and then transmitted to the master chip 031.

[0097] Optionally, in combination with FIG. 3A, Figures 2 to 4 The display panel M1 described in the embodiments of the present disclosure can include n rows and m columns of light emitting elements L0. The master chip 031 can be used to determine the wire drop on the wire L1 coupled with each light emitting element L0 as the sum of the first voltage drop on the first signal line L11 coupled with each light emitting element L0 and the second voltage drop on the second signal line L12 coupled with each light emitting element L0.

[0098] Taking the second signal line L12 grounded GND as an example, that is, in the embodiments of the present disclosure, the wire drop V IR drop_ij on the wire L1 coupled with the light emitting element L0_ij located in the i-th row and the j-th column can satisfy:

[0099] V IR drop_ij = V IRdrop_V_ij + V IRdrop_GND_ij Formula (1).

[0100] Wherein, n, m, i and j can each be an integer greater than 0, i is less than or equal to n, and j is less than or equal to m. V IRdrop_V_ij refers to the first voltage drop on the first signal line L11 coupled with the light emitting element L0_ij; and V IRdrop_GND_ij refers to the second voltage drop on the second signal line L12 coupled with the light emitting element L0_ij.

[0101] Optionally, in combination with FIG. 3A, Figures 2 to 4 ​The second circuit board 022 can also include signal lines. The master control chip 031 according to the embodiments of the present disclosure can extract the first trace resistance on the first signal line L11 coupled with each light emitting element L0, the second trace resistance on the second signal line L12 coupled with each light emitting element L0, the bonding resistance of the bonding connection (for example, the bonding resistance of the bonding connection between the first circuit board 021 and the second circuit board 022), and the third trace resistance in the second circuit board 022. Then, the master control chip 031 can further determine the first voltage drop on the first signal line L11 coupled with each light emitting element L0 according to the first trace resistance, the bonding resistance and the third trace resistance. And can further determine the second voltage drop on the second signal line L12 coupled with each light emitting element L0 according to the second trace resistance, the bonding resistance and the third trace resistance.

[0102] For the light emitting element L0_ij located in the i-th row and the j-th column, the first voltage drop V_IRdrop_V_ij can satisfy:

[0103] For the light emitting element L0_ij located in the i-th row and the j-th column, the second voltage drop V_IRdrop_GND_ij can satisfy:

[0104]

[0105] wherein, I_ ij is the working current of the light emitting element L0 in the i-th row and the j-th column. In combination with Figure 6The resistance distribution diagram shows that r_PCB_Bonding refers to the bonding resistance of the first signal line L11 bonding side (i.e., one end of the first signal line L11 coupled) first circuit board (i.e., XPCB) and the second circuit board (i.e., FPC) bonding, r_PCB_Bonding' refers to the bonding resistance of the second signal line L12 bonding side (i.e., one end of the second signal line L12 coupled) XPCB and FPC bonding, r_FPC refers to the third trace resistance of the first signal line L11 bonding side FPC, r_FPC' refers to the third trace resistance of the second signal line L12 bonding side FPC, r_Bonding refers to the bonding resistance of the FPC and the first signal line L11 bonding, r_Bonding' refers to the bonding resistance of the FPC and the second signal line L12 bonding, r_Fanout refers to the fanout resistance of the first signal line L11 fanout part, r_Fanout' refers to the fanout resistance of the second signal line L12 fanout part, r i refers to the first trace resistance of the first signal line L11, and r i' refers to the second trace resistance of the second signal line L12. The fanout part generally refers to the part of the signal line extending from the display area to the FPC.

[0106] After the master control chip 031 determines the ideal working voltage V_LED corresponding to the working current of each light emitting element L0 at the target gray scale, and the trace voltage drop V_IRdrop on the trace L1 coupled with each light emitting element L0, the master control chip 031 can be further used to: determine the sum of the ideal working voltage V_LED corresponding to the working current of each light emitting element L0 at the target gray scale and the trace voltage drop V_IRdrop on the trace L1 coupled with each light emitting element L0 as the target working voltage VLED of each light emitting element L0.

[0107] That is, the target working voltage VLED of each light emitting element L0 can satisfy:

[0108] VLED = V_LED + V_IRdrop Formula (4);

[0109] Then, the master control chip 031 can extract the maximum target working voltage VLED_max on the entire display panel M1, and transmit a feedback signal FB related to the maximum target working voltage VLED_max to the voltage regulation sub-circuit 032 based on the maximum target working voltage VLED_max.

[0110] Optionally, in the embodiment of the present disclosure, the feedback signal FB generated by the master control chip 031 can be a digital signal. Since the power supply circuit 01 generally can only process analog signals, accordingly, the reference Figure 7It can be seen that the voltage regulation sub-circuit 032 disclosed in the embodiments of the present disclosure can include a digital-to-analog converter (DAC) 0321 and a voltage regulation module 0322.

[0111] The digital-to-analog converter 0321 can be coupled with the master chip 031 and the voltage regulation module 0322 respectively. The digital-to-analog converter 0321 can be used to convert the feedback signal FB transmitted by the master chip 031 into a voltage regulation signal Vdac, and transmit the voltage regulation signal Vdac to the voltage regulation module 0322.

[0112] Based on the working principle of the DAC 0321, the voltage regulation signal Vdac converted by the digital-to-analog converter 0321 can be an analog signal. That is, the voltage regulation signal Vdac and the feedback signal FB are of the same size, but of different types, one being a digital signal and the other being an analog signal.

[0113] The voltage regulation module 0322 can also be coupled with the power supply circuit (i.e., DCDC) 01. The voltage regulation module 0322 can be used to adjust the size of the supply voltage V_L0 output by the power supply circuit 01 according to the voltage regulation signal Vdac.

[0114] Optionally, continuing to refer to Figure 8 It can be seen that the power supply circuit 01 disclosed in the embodiments of the present disclosure can have a feedback pin Fb and an output pin Vout. The voltage regulation module 0322 can include a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a feedback resistor Rfb.

[0115] The one end of the first voltage dividing resistor R1, the one end of the second voltage dividing resistor R2, and the one end of the feedback resistor Rfb can be coupled with the feedback pin Fb of the power supply circuit 01. The other end of the first voltage dividing resistor R1 can be coupled with the output pin Vout of the power supply circuit 01, the other end of the second voltage dividing resistor R2 can be grounded GND, and the other end of the feedback resistor Rfb can be coupled with the digital-to-analog converter 0321.

[0116] On this basis, according to Kirchhoff's current law, the current i of any node in the circuit satisfies: That is, the sum of the current flowing into the node and the current flowing out of the node is 0. In this way, taking the supply voltage V_L0 equal to the target supply voltage VLED as an example, for the node P0 shown in Figure 8 It can be seen that the power supply circuit 01 can satisfy:

[0117]

[0118] The power supply circuit 01 outputs a power supply voltage V_L0, which can satisfy the following formula (6) by transforming the above formula (5):

[0119] V_L0 = VLED = [(1 + r10 / r20 + (r10 + r20) / rfb)]*Vfb - Vdac0*(r10 + r20) / rfb formula (6);

[0120] wherein r10 refers to the resistance value of the first voltage dividing resistor R1, r20 refers to the resistance value of the second voltage dividing resistor R2, rfb refers to the resistance value of the feedback resistor Rfb, Vfb refers to the voltage value of the feedback pin Fb, Vdac0 refers to the voltage value of the voltage regulation signal Vdac, and r10, r20, rfb and Vfb are all constant values. In this way, it can be determined that the power supply voltage V_L0 finally output by the power supply circuit 01 is controlled by the voltage regulation signal Vdac.

[0121] In addition, referring to Figure 8 It can also be seen that the power supply circuit 01 further has an input pin Vin, which can be externally connected to an input power terminal VIN and work in response to a signal provided by the input power terminal VIN. For example, the input power terminal VIN can be 220V mains.

[0122] Optionally, considering that temperature can affect the light emitting efficiency of the light emitting element L0 and some characteristic information (such as the volt-ampere characteristic curve) of the light emitting element L0, the main control chip 031 can be configured to reserve a margin (Margin) for the actually calculated target working voltage VLED when determining the target working voltage VLED. The Margin can be flexibly set according to actual products.

[0123] For example, the main control chip 031 can transmit a feedback signal FB to the voltage regulation sub-circuit 032 based on the difference between the actually determined target working voltage VLED and the Margin. Here, the temperature can refer to the ambient temperature or the device temperature of the display panel M1. In this way, the light emitting efficiency of the light emitting element L0 can be ensured to be good under the premise of reducing power consumption, thereby ensuring that the display effect of the display panel M1 is good.

[0124] To sum up, the display panel driving circuit provided by the embodiments of the present disclosure includes a power supply circuit, an adapter circuit board and a voltage regulation circuit. The adapter circuit board can transmit the power supply voltage provided by the power supply circuit to the light emitting element in the display panel. The voltage regulation circuit can adjust the power supply voltage provided by the power supply circuit based on the ideal working voltage of the light emitting element at a certain gray scale and the voltage drop of the wire coupled to the light emitting element. That is, the voltage regulation circuit can flexibly adjust the power supply voltage provided by the power supply circuit to the light emitting element based on the gray scale of the display image displayed by the display panel. In this way, the working power consumption of the display device can be effectively reduced, and the product yield can be improved.

[0125] Figure 9 The display panel driving method provided by the embodiments of the present disclosure is a flow chart of a display panel driving method. The method can be applied to the voltage regulation circuit included in the driving circuit as shown in the above-mentioned figure, and the driving circuit further includes a power supply circuit. Referring to Figure 9 It can be seen that the driving method described in the embodiments of the present disclosure can include:

[0126] Step 901, when the display panel displays a display image of a target gray scale, determining the ideal working voltage of each light emitting element according to the working current of each light emitting element at the target gray scale.

[0127] Step 902, determining the voltage drop of the wire coupled to each light emitting element.

[0128] Step 903, adjusting the size of the power supply voltage output by the power supply circuit included in the driving circuit according to the ideal working voltage of each light emitting element and the voltage drop of the wire coupled to each light emitting element.

[0129] Optionally, referring to Figure 4 It can be seen that the voltage regulation circuit 03 described in the embodiments of the present disclosure can include a master control chip 031 and a voltage regulation sub-circuit 032. The master control chip 031 can be coupled to the voltage regulation sub-circuit 032, and the voltage regulation sub-circuit 032 can be coupled to the power supply circuit 01. Wherein, the master control chip 031 can store a Gamma table and a voltage-current characteristic curve corresponding to the attribute information of each light emitting element L0. The Gamma table is configured to represent the mapping relationship between the display gray scale and the working current, and the display gray scale can refer to the gray scale of the display image required to be displayed by the display panel M1. The voltage-current characteristic curve is configured to represent the mapping relationship between the working current of each light emitting element L0 and the ideal working voltage V_LED of each light emitting element L0 at the target gray scale. On this basis, the above-mentioned step 901 can include:

[0130] The main control chip 031 looks up in the Gamma table to determine the working current of each light emitting element L0 at the target gray scale. In addition, the attribute information of each light emitting element L0 is obtained, and the ideal working voltage corresponding to the working current of each light emitting element L0 at the target gray scale is determined according to the voltage-current characteristic curve corresponding to the attribute information of each light emitting element L0 and the working current of each light emitting element L0 at the target gray scale. The detailed steps of determining the ideal working voltage can be referred to the description of the device-side embodiment above, and will not be repeated here.

[0131] Optionally, referring to Figures 2 to 4 It can be seen that the driving circuit further includes a conversion circuit board 02. The conversion circuit board 02 can include a first circuit board 021 and a second circuit board 022 which are connected by binding. The wire L1 can include a first signal line L11 and a second signal line L12. The second circuit board 022 can be coupled with the first pole of each light emitting element L0 through the first signal line L11, and can be coupled with the second pole of each light emitting element L0 through the second signal line L12. On this basis, the above step 902 can include:

[0132] The first voltage drop on the first signal line L11 coupled with each light emitting element L0 and the second voltage drop on the second signal line L12 coupled with each light emitting element L0 are summed by the main control chip 031 to determine the wire voltage drop on the wire coupled with each light emitting element L0. The detailed steps of determining the wire voltage drop can be referred to the description of the device-side embodiment above, and will not be repeated here.

[0133] In addition, the above step 903 can include: determining the target working voltage of each light emitting element L0 according to the ideal working voltage corresponding to the working current of each light emitting element L0 at the target gray scale and the wire voltage drop on the wire coupled with each light emitting element L0 by the main control chip 031, and transmitting a feedback signal to the voltage regulation sub-circuit according to the target working voltage of each light emitting element L0. Then, the voltage regulation sub-circuit 032 dynamically adjusts the size of the power supply voltage output by the power supply circuit 01 based on the received feedback signal. The detailed steps of adjusting the power supply voltage can be referred to the description of the device-side embodiment above, and will not be repeated here.

[0134] In combination with the above embodiments and Figure 10As shown in another driving method flowchart, in the embodiment of the present disclosure, first, the Gamma table can be searched by the master control chip 031 to determine the working current of the light emitting element L0, the voltage-current characteristic curve corresponding to the light emitting element L0 is determined according to the Bin level, and a series of resistors are determined. Then, the master control chip 031 calculates the target working voltage VLED according to the above determined information. Finally, the master control chip 031 outputs the feedback signal FB according to the calculated target working voltage VLED, and the voltage of the feedback pin Fb of the DCDC is controlled by the digital-to-analog converter DAC through the feedback signal FB, so as to realize the control of the size of the power supply voltage output by the DCDC. In addition, the integrated circuit chip can then update the next frame DATA data to the MIC, and the MIC drives the light emitting element L0 to emit light based on the DATA data. Further, the display panel can be reliably displayed.

[0135] In summary, the embodiment of the present disclosure provides a driving method of a display panel, in which the voltage adjustment circuit can adjust the power supply voltage provided by the power supply circuit based on the ideal working voltage of the light emitting element at a certain gray scale and the wire pressure drop of the wire to which the light emitting element is coupled. That is, the voltage adjustment circuit can flexibly adjust the power supply voltage provided by the power supply circuit to the light emitting element based on the gray scale of the picture displayed by the display panel. In this way, the working power consumption of the display device can be effectively reduced, and the product yield can be improved.

[0136] Figure 11 FIG. 1 is a structural schematic diagram of a display device provided by an embodiment of the present disclosure. As shown in the figure, the display device includes a display panel M1 and a driving circuit 00 as shown in the above figures. The display panel M1 includes a plurality of light emitting elements L0. Figure 11 The driving circuit 00 is coupled with the plurality of light emitting elements L0 in the display panel M1 (not shown in the figure) and is used to transmit a power supply voltage to each light emitting element L0.

[0137] Optionally, the display device described in the embodiment of the present disclosure can be a Mini LED direct display display device, an active-matrix organic light-emitting diode (AMOLED) display device, an OLED display device, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame or a navigator, or any product or component with display function.

[0138] The above description is only an optional embodiment of the present disclosure, and is not used to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A drive circuit of a display panel, characterized by, The display panel comprises a plurality of light emitting elements, the driving circuit comprises a power supply circuit, a conversion circuit board and a voltage regulation circuit; The power supply circuit is coupled with the conversion circuit board, and the power supply circuit is configured to transmit a power supply voltage to the conversion circuit board; The conversion circuit board is further coupled with the plurality of light emitting elements through wires, and the conversion circuit board is configured to transmit the power supply voltage to each of the light emitting elements; The voltage regulation circuit is coupled with the power supply circuit, and the voltage regulation circuit is configured to determine an ideal working voltage corresponding to a working current of each of the light emitting elements at a target gray scale according to a voltage-current characteristic curve corresponding to attribute information of each of the light emitting elements and the working current of each of the light emitting elements at the target gray scale, and adjust a size of the power supply voltage output by the power supply circuit according to the ideal working voltage corresponding to the working current of each of the light emitting elements at the target gray scale and a wire drop on a wire coupled with each of the light emitting elements, and the size of the power supply voltage is positively correlated with the height of the target gray scale; The wire comprises a first signal line and a second signal line, the conversion circuit board is coupled with a first pole of each of the light emitting elements through the first signal line and is coupled with a second pole of each of the light emitting elements through the second signal line, the conversion circuit board is configured to transmit the power supply voltage to each of the light emitting elements through the first signal line and transmit a pull-down power signal to each of the light emitting elements through the second signal line, the conversion circuit board comprises a first circuit board and a plurality of second circuit boards which are connected in a binding manner, the first circuit board is coupled with the power supply circuit, each of the second circuit boards is coupled with the plurality of light emitting elements through wires in a binding manner, and the light emitting elements connected with each of the second circuit boards are different, the first circuit board is a hard printed circuit board, and the second circuit board is a flexible circuit board; The wire drop on the wire coupled with each of the light emitting elements comprises a sum of a first drop on the first signal line coupled with each of the light emitting elements and a second drop on the second signal line coupled with each of the light emitting elements, and the plurality of light emitting elements comprise n rows and m columns of light emitting elements; For the light emitting element located in the i-th row and the j-th column, the first drop V_IRdrop_V_ij satisfies: ； For the light emitting element located in the i-th row and the j-th column, the second drop V_IRdrop_GND_ij satisfies: ； Wherein, n, m, i and j are all integers greater than 0, and i is less than or equal to n, j is less than or equal to m, I_ij refers to the working current of the i-th row and j-th column light emitting element, r_PCB_Bonding refers to the bonding resistance of the first signal line bonding side of the first circuit board and the second circuit board, r_PCB_Bonding' refers to the bonding resistance of the second signal line bonding side of the first circuit board and the second circuit board, r_FPC refers to the third trace resistance of the second circuit board on the first signal line bonding side, r_FPC' refers to the third trace resistance of the second circuit board on the second signal line bonding side, r_Bonding refers to the bonding resistance of the second circuit board and the first signal line, r_Bonding' refers to the bonding resistance of the second circuit board and the second signal line, r_Fanout refers to the fanout resistance of the first signal line fanout part, r_Fanout' refers to the fanout resistance of the second signal line fanout part, r_i refers to the first trace resistance of the first signal line, and r_i' refers to the second trace resistance of the second signal line.

2. The drive circuit according to claim 1, characterized in that, The voltage regulation circuit comprises a master control chip and a voltage regulation sub-circuit; the master control chip is coupled with the voltage regulation sub-circuit, and the master control chip is configured to determine a target working voltage of each light emitting element according to an ideal working voltage corresponding to a working current of each light emitting element at the target gray scale and a trace voltage drop on a trace coupled with each light emitting element, and transmit a feedback signal to the voltage regulation sub-circuit according to the target working voltage of each light emitting element; The voltage regulation sub-circuit is also coupled with the power supply circuit, and the voltage regulation sub-circuit is configured to adjust the size of the power supply voltage output by the power supply circuit according to the feedback signal.

3. The drive circuit according to claim 2, characterized in that, The feedback signal is a digital signal; the voltage regulation sub-circuit comprises a digital-to-analog converter and a voltage regulation module; The digital-to-analog converter is coupled with the master control chip and the voltage regulation module respectively, and the digital-to-analog converter is configured to convert the feedback signal into a voltage regulation signal and transmit the voltage regulation signal to the voltage regulation module, wherein the voltage regulation signal is an analog signal; The voltage regulation module is also coupled with the power supply circuit, and the voltage regulation module is configured to adjust the size of the power supply voltage output by the power supply circuit according to the voltage regulation signal.

4. The drive circuit according to claim 3, characterized in that, The power supply circuit has a feedback pin and an output pin; the voltage regulation module comprises a first voltage dividing resistor, a second voltage dividing resistor and a feedback resistor; Wherein, one end of the first voltage dividing resistor, one end of the second voltage dividing resistor and one end of the feedback resistor are all coupled with the feedback pin of the power supply circuit; The other end of the first voltage dividing resistor is coupled with the output pin of the power supply circuit, the other end of the second voltage dividing resistor is grounded, and the other end of the feedback resistor is coupled with the digital-to-analog converter.

5. The drive circuit according to claim 4, characterized in that, The power supply circuit outputs a supply voltage V_L0, which satisfies: V_L0=[(1+r10 / r20+(r10+r20) / rfb)]*Vfb-Vdac0*(r10+r20) / rfb; Wherein, r10 refers to the resistance value of the first voltage dividing resistor, r20 refers to the resistance value of the second voltage dividing resistor, rfb refers to the resistance value of the feedback resistor, Vfb refers to the voltage value of the feedback pin, and Vdac0 refers to the voltage value of the voltage regulation signal.

6. The drive circuit according to any one of claims 2 to 5, characterized by The master control chip is used to: Determine the target working voltage of each light emitting element as the sum of the ideal working voltage corresponding to the working current of each light emitting element at the target gray scale and the wire voltage drop on the wire coupled with each light emitting element; And transmit a feedback signal to the voltage regulation sub-circuit according to the maximum target working voltage among the determined target working voltages.

7. The drive circuit according to any one of claims 2 to 5, characterized by The master control chip stores a volt-ampere characteristic curve corresponding to the attribute information of each light emitting element, and the volt-ampere characteristic curve is configured to represent the mapping relationship between the working current of each light emitting element and the ideal working voltage of each light emitting element at the target gray scale; the master control chip is also used to: Obtain the attribute information of each light emitting element; Determine the ideal working voltage corresponding to the working current of each light emitting element at the target gray scale according to the volt-ampere characteristic curve corresponding to the attribute information of each light emitting element and the working current of each light emitting element at the target gray scale.

8. The drive circuit according to any one of claims 2 to 5, characterized by The master control chip stores a gamma table, and the gamma table is configured to represent the mapping relationship between display gray scale and working current, and the display gray scale refers to the gray scale of the display picture displayed by the display panel; The master control chip is also used to find in the gamma table to determine the working current of each light emitting element at the target gray scale.

9. The drive circuit according to any one of claims 2 to 5, characterized by The master control chip is a micro control unit (MCU).

10. The drive circuit according to any one of claims 1 to 5, characterized by The power supply circuit is a direct current-direct current (DC-DC) power supply circuit.

11. The drive circuit according to any one of claims 1 to 5, characterized by The light emitting element is a micro light emitting diode (Mini LED).

12. A driving method of a display panel, characterized by, The method is applied to the voltage regulation circuit included in the driving circuit of any one of claims 1 to 11, and the method comprises: When the display panel displays a display picture of a target gray scale, determining the ideal working voltage of each light emitting element according to the working current of each light emitting element at the target gray scale; Determining the wire voltage drop on the wire coupled with each light emitting element; According to the ideal working voltage of each light emitting element and the wire voltage drop on the wire coupled with each light emitting element, adjusting the size of the supply voltage output by the power supply circuit included in the driving circuit.

13. A display device comprising: The display device comprises a display panel and a driving circuit as claimed in any one of claims 1 to 11, and the display panel comprises a plurality of light emitting elements; Wherein, the driving circuit is coupled with the plurality of light emitting elements in the display panel and is used to transmit a supply voltage to each light emitting element.

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