Voltage management circuit and driving method therefor, and display module

Abstract

The present disclosure provides a voltage management circuit and a driving method therefor, and a display module. In the voltage management circuit, an output control sub-circuit is separately coupled to a first node, a signal terminal to be managed, and a ground signal input terminal, and is used for controlling to make or break an electrical connection between the signal terminal to be managed and the ground signal input terminal; a first node control sub-circuit is separately coupled to the first node, a second node, and the signal terminal to be managed, and is used for controlling to make or break an electrical connection between the first node and the second node; and a second node control sub-circuit is separately coupled to the second node, the signal terminal to be managed, and the ground signal input terminal, and is used for controlling to make or break an electrical connection between the second node and the signal terminal to be managed.

Description

Voltage management circuit, driving method thereof and display module

[0001] Cross-reference to related applications

[0002] The present application claims priority from Chinese Patent Application No. 202411372654.7 filed on September 29, 2024, the contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of display, and in particular to a voltage management circuit, a driving method thereof and a display module. BACKGROUND

[0004] In the process from production to terminal use of an organic light-emitting diode (OLED) display module, a lighting device uses a lighting machine power supply or a boost conversion circuit of a power IC as an external direct supply voltage source, and outputs a required operating voltage to a driver IC in the OLED display module through the external direct supply voltage source. However, almost all lighting machine power supplies and part of the power ICs do not have a function of managing the output voltage state after power-off, so that the voltage output end of the external direct supply voltage source is in a suspended state after power-off, resulting in abnormal potential of the voltage output end, which is particularly serious when the voltage output end is used to provide a negative operating voltage. When the lighting device is subjected to secondary lighting, the power-on logic and voltage of the driver IC are not controlled, and abnormal power-on of the driver IC will further cause display abnormality of the OLED display module, resulting in production and verification loss. SUMMARY

[0005] The purpose of the present disclosure is to provide a voltage management circuit, a driving method thereof and a display module.

[0006] In order to achieve the above-mentioned purpose, the present disclosure provides the following technical solutions:

[0007] A first aspect of the present disclosure provides a voltage management circuit, comprising:

[0008] An output control sub-circuit coupled with a first node, a to-be-managed signal end and a ground signal input end, respectively, for controlling the electrical connection between the to-be-managed signal end and the ground signal input end to be turned on or turned off under the control of the potential of the first node;

[0009] A first node control sub-circuit coupled with the first node, a second node and the to-be-managed signal end, respectively, for controlling the electrical connection between the first node and the second node to be turned on or turned off under the control of the potential of the to-be-managed signal end.

[0010] The second node control sub-circuit is coupled with the second node, the signal terminal to be managed and the ground signal input terminal respectively, and is configured to control the electrical connection between the second node and the signal terminal to be managed to be turned on or turned off under the control of the potential of the signal terminal to be managed.

[0011] Optionally, the second node control sub-circuit comprises:

[0012] The voltage division module is coupled with the signal terminal to be managed, the ground signal input terminal and a third node respectively, and is configured to control the potential of the third node.

[0013] The storage module has a first end coupled with the second node and a second end coupled with the ground signal input terminal.

[0014] The unidirectional conduction module has a first end coupled with the third node and a second end coupled with the second node.

[0015] Optionally, the voltage division module comprises a first resistor and a second resistor, the first end of the first resistor is coupled with the signal terminal to be managed, and the second end of the first resistor is coupled with the third node; the first end of the second resistor is coupled with the third node, and the second end of the second resistor is coupled with the ground signal input terminal.

[0016] The storage module comprises a storage capacitor, the first end of the storage capacitor is coupled with the second node, and the second end of the storage capacitor is coupled with the ground signal input terminal.

[0017] The unidirectional conduction module comprises a diode, the first pole of the diode is coupled with the third node, and the second pole of the diode is coupled with the second node.

[0018] Optionally, the first node control sub-circuit comprises a first transistor, the gate of the first transistor is coupled with the signal terminal to be managed, the first pole of the first transistor is coupled with the second node, and the second pole of the first transistor is coupled with the first node.

[0019] Optionally, the output control sub-circuit comprises a second transistor, the gate of the second transistor is coupled with the first node, the first pole of the second transistor is coupled with the signal terminal to be managed, and the second pole of the second transistor is coupled with the ground signal input terminal.

[0020] Optionally, the to-be-managed signal terminal comprises a to-be-managed negative voltage signal terminal, the first transistor comprises an N-type transistor, the second transistor comprises a P-type transistor, the first electrode of the diode comprises a cathode, and the second electrode of the diode comprises an anode.

[0021] Optionally, the to-be-managed signal terminal comprises a to-be-managed positive voltage signal terminal, the first transistor comprises a P-type transistor, the second transistor comprises an N-type transistor, the first electrode of the diode comprises an anode, and the second electrode of the diode comprises a cathode.

[0022] Optionally, the voltage management circuit further comprises:

[0023] a load sub-circuit, the first node control sub-circuit being coupled to the to-be-managed signal terminal through the load sub-circuit; and / or,

[0024] a first discharge sub-circuit, a first end of the first discharge sub-circuit being coupled to the first node, and a second end of the first discharge sub-circuit being coupled to the ground signal input terminal; and / or,

[0025] a second discharge sub-circuit, the output control sub-circuit being coupled to the to-be-managed signal terminal through the second discharge sub-circuit.

[0026] Optionally, the load sub-circuit comprises a third resistor, a first end of the third resistor being coupled to the to-be-managed signal terminal, and a second end of the third resistor being coupled to the first node control sub-circuit.

[0027] the first discharge sub-circuit comprises a fourth resistor, a first end of the fourth resistor being coupled to the first node, and a second end of the fourth resistor being coupled to the ground signal input terminal.

[0028] the second discharge sub-circuit comprises a fifth resistor, a first end of the fifth resistor being coupled to the to-be-managed signal terminal, and a second end of the fifth resistor being coupled to the output control sub-circuit.

[0029] Based on the technical solution of the above voltage management circuit, the second aspect of the present disclosure provides a display module comprising the above voltage management circuit; and further comprising a driving circuit, the driving circuit comprising a voltage signal input terminal, the voltage signal input terminal being coupled to the to-be-managed signal terminal of the voltage management circuit.

[0030] Optionally, the display module comprises a display panel and a flexible circuit board, the flexible circuit board being bound in a non-display area of the display panel.

[0031] the driving circuit is located in the non-display area of the display panel, and the voltage management circuit is located on the flexible circuit board.

[0032] Based on the technical solutions of the above voltage management circuit, a third aspect of the present disclosure provides a driving method of a voltage management circuit, used for driving the above voltage management circuit; the driving method comprises:

[0033] In the normal output stage, the output control sub-circuit controls to disconnect the electrical connection between the to-be-managed signal end and the ground signal input end under the control of the potential of the first node; the first node control sub-circuit controls to disconnect the electrical connection between the first node and the second node under the control of the potential of the to-be-managed signal end; and the second node control sub-circuit controls to connect the electrical connection between the second node and the to-be-managed signal end under the control of the potential of the to-be-managed signal end.

[0034] In the discharging stage, the output control sub-circuit controls to connect the electrical connection between the to-be-managed signal end and the ground signal input end under the control of the potential of the first node; the first node control sub-circuit controls to connect the electrical connection between the first node and the second node under the control of the potential of the to-be-managed signal end; and the second node control sub-circuit controls to disconnect the electrical connection between the second node and the to-be-managed signal end under the control of the potential of the to-be-managed signal end.

[0035] Optionally, the driving method further comprises:

[0036] After the discharging stage ends, the output control sub-circuit controls to disconnect the electrical connection between the to-be-managed signal end and the ground signal input end under the control of the potential of the first node; and the first node control sub-circuit controls to disconnect the electrical connection between the first node and the second node under the control of the potential of the to-be-managed signal end.

[0037] Optionally, the second node control sub-circuit comprises a voltage division module, a storage module and a one-way conduction module; the voltage division module is coupled with the to-be-managed signal end, the ground signal input end and a third node respectively, and is used to control the potential of the third node; the first end of the storage module is coupled with the second node, and the second end of the storage module is coupled with the ground signal input end; the first end of the one-way conduction module is coupled with the third node, and the second end of the one-way conduction module is coupled with the second node.

[0038] In the normal output stage, the one-way conduction module connects the electrical connection between the third node and the second node under the control of the potential of the third node.

[0039] In the discharging stage, the one-way conduction module disconnects the electrical connection between the third node and the second node under the control of the potential of the third node.

[0040] Optionally, the first node control sub-circuit comprises a first transistor, a gate of the first transistor is coupled with the signal terminal to be managed, a first pole of the first transistor is coupled with the second node, and a second pole of the first transistor is coupled with the first node; and the output control sub-circuit comprises a second transistor, a gate of the second transistor is coupled with the first node, a first pole of the second transistor is coupled with the signal terminal to be managed, and a second pole of the second transistor is coupled with the ground signal input terminal.

[0041] In the normal output stage, under the control of the potential of the first node, the second transistor is turned off; and under the control of the potential of the signal terminal to be managed, the first transistor is turned off.

[0042] In the discharging stage, under the control of the potential of the first node, the second transistor is turned on; and under the control of the potential of the signal terminal to be managed, the first transistor is turned on.

[0043] After the discharging stage, under the control of the potential of the first node, the second transistor is turned off; and under the control of the potential of the signal terminal to be managed, the first transistor is turned off. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings, which are included to provide a further understanding of the present disclosure and constitute a part of the present disclosure, illustrate the exemplary embodiments of the present disclosure and serve to explain the present disclosure together with the description. In the drawings:

[0045] FIG. 1 is a first module schematic diagram of a voltage management circuit according to an embodiment of the present disclosure;

[0046] FIG. 2 is a second module schematic diagram of a voltage management circuit according to an embodiment of the present disclosure;

[0047] FIG. 3 is a third module schematic diagram of a voltage management circuit according to an embodiment of the present disclosure;

[0048] FIG. 4 is a first circuit structure schematic diagram of a voltage management circuit according to an embodiment of the present disclosure;

[0049] FIG. 5 is a schematic diagram of voltage values of nodes of the circuit structure of FIG. 4 in a normal output stage;

[0050] FIG. 6 is a schematic diagram of voltage values of nodes of the circuit structure of FIG. 4 in a discharging stage;

[0051] FIG. 7 is a schematic diagram of voltage values of nodes of the circuit structure of FIG. 4 after the discharging stage;

[0052] FIG. 8 is a second circuit structure schematic diagram of a voltage management circuit according to an embodiment of the present disclosure; FIG. 8 is a second circuit structure schematic diagram of a voltage management circuit according to an embodiment of the present disclosure;

[0053] Fig. 9 is a signal waveform diagram of a signal terminal to be managed when connected to a voltage management circuit and not connected to a voltage management circuit according to an embodiment of the present disclosure;

[0054] Fig. 10 is a schematic diagram of a display module connection lighting device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] To further illustrate the voltage management circuit and the driving method and the display module thereof according to the embodiments of the present disclosure, detailed descriptions are made below in conjunction with the accompanying drawings.

[0056] It is found through research that after the power supply of the lighting device is powered off, the voltage output terminal of the external direct voltage source is in a suspended state, resulting in abnormal potential of the voltage output terminal, and the time and state of the point cannot be determined. This abnormality is particularly serious when the voltage output terminal is used to provide a negative working voltage, especially when one end of a capacitor is used as the voltage output terminal or there is a parasitic capacitor in the power supply loop. When the lighting device is re-lit, the Driver IC power-on logic and voltage are not controlled, and the abnormal Driver IC power-on will further cause the OLED display module to display abnormally, resulting in production and verification loss.

[0057] To avoid the above loss, currently only manual grounding shorting of the lighting device can be performed after the power supply of the lighting device is powered off, or the device can be modified, or a Power IC with power-off management function can be purchased; the lighting device involves many types and a large number in the production end to the terminal, and a large amount of human resources is consumed for device identification and manual rapid discharge, and a great cost is spent on improvement period and cost of device modification, and the range of Power IC selection is small, so there is an urgent need for an improvement method of automatic and rapid discharge when the external direct voltage is powered off, so that the external direct voltage scheme is highly related to the OLED display module scheme, and the scheme is flexible.

[0058] Referring to Fig. 1, the present embodiment provides a voltage management circuit, comprising:

[0059] The output control sub-circuit 10 is coupled with the first node N1, the signal terminal to be managed V, and the ground signal input terminal respectively; and is used to control the electrical connection between the signal terminal to be managed V and the ground signal input terminal to be turned on or turned off under the control of the potential of the first node N1;

[0060] The first node control sub-circuit 20 is coupled with the first node N1, the second node N2, and the signal terminal to be managed V respectively; and is used to control the electrical connection between the first node N1 and the second node N2 to be turned on or turned off under the control of the potential of the signal terminal to be managed V;

[0061] The second node control sub-circuit 30 is coupled with the second node N2, the signal terminal V to be managed and the ground signal input terminal respectively, and is configured to control the electrical connection between the second node N2 and the signal terminal V to be managed to be turned on or turned off under the control of the potential of the signal terminal V to be managed.

[0062] For example, when the voltage management circuit is applied to a display module, the signal terminal V to be managed is coupled with a voltage signal input terminal Vin included in a driving circuit of the display module. The voltage signal input terminal Vin included in the driving circuit is configured to receive a required operating voltage.

[0063] For example, when the display module is used in cooperation with a lighting device, the voltage signal input terminal Vin included in the driving circuit is coupled with a voltage output terminal Vout of an external direct supply voltage source in the lighting device, and is configured to receive an operating voltage output by the voltage output terminal Vout of the external direct supply voltage source. The signal terminal V to be managed coupled with the voltage management circuit can be coupled with the voltage output terminal Vout of the external direct supply voltage source. It is worth noting that the types of the external direct supply voltage source in the lighting device are not limited to the capacitor output voltage type and the power supply output circuit with parasitic capacitance type, and the external direct supply voltage of the lighting device is not limited, and can be flexibly increased or reduced, and the scheme structure matches the external direct supply voltage management circuit.

[0064] For example, the ground signal input terminal is configured to input a ground signal, and the voltage value of the ground signal is 0V.

[0065] The specific driving method of the voltage management circuit includes:

[0066] In the normal output stage, that is, the voltage output terminal Vout of the external direct supply voltage source in the lighting device provides an operating voltage for the Driver IC, and the Driver IC is powered on according to the operating voltage. In this stage, the potential of the signal terminal V to be managed coupled with the voltage management circuit is the same as the operating voltage; in this stage, the second node control sub-circuit 30 controls the electrical connection between the second node N2 and the signal terminal V to be managed to be turned on under the control of the potential of the signal terminal V to be managed; the first node control sub-circuit 20 controls the electrical connection between the first node N1 and the second node N2 to be turned off under the control of the potential of the signal terminal V to be managed; and the output control sub-circuit 10 controls the electrical connection between the signal terminal V to be managed and the ground signal input terminal to be turned off under the control of the potential of the first node N1, so as to keep the potential of the signal terminal V to be managed in the current state and meet the normal working requirement.

[0067] In the discharging phase, the external direct supply voltage source in the lighting device is powered off, and the driver IC is powered off. In this phase, the second node control sub-circuit 30 controls the disconnection of the electrical connection between the second node N2 and the signal terminal V under the control of the potential of the signal terminal V; the first node control sub-circuit 20 controls the conduction of the electrical connection between the first node N1 and the second node N2 under the control of the potential of the signal terminal V; and the output control sub-circuit 10 controls the conduction of the electrical connection between the signal terminal V and the ground signal input terminal under the control of the potential of the first node N1, thereby discharging the signal terminal V.

[0068] As shown in FIG. 9, a signal waveform diagram of the signal terminal V when the external direct supply voltage source in the lighting device is powered off is illustrated in the case of connecting the voltage management circuit and not connecting the voltage management circuit. The solid line in FIG. 9 represents the signal waveform diagram of the signal terminal V when the external direct supply voltage source in the lighting device is powered off in the case of not connecting the voltage management circuit. It can be seen that the signal is in an abnormal state. The dashed line in FIG. 9 represents the signal waveform diagram of the signal terminal V after discharging when the external direct supply voltage source in the lighting device is powered off in the case of connecting the voltage management circuit. It can be seen that the signal has the same potential as the ground signal.

[0069] According to the specific structure of the voltage management circuit, in the voltage management circuit provided by the embodiment of the present disclosure, the second node control sub-circuit 30 is controlled by the potential of the signal terminal V, can control the conduction or disconnection of the electrical connection between the second node N2 and the signal terminal V, thereby controlling the potential of the second node N2; the first node control sub-circuit 20 is controlled by the potential of the signal terminal V, can control the conduction or disconnection of the electrical connection between the first node N1 and the second node N2, thereby controlling the potential of the first node N1; and the output control sub-circuit 10 is controlled by the potential of the first node N1, can control the conduction or disconnection of the electrical connection between the signal terminal V and the ground signal input terminal, thereby controlling the potential of the signal terminal V.

[0070] The voltage management circuit provided in the embodiments of the present disclosure can control the electrical connection between the second node N2 and the to-be-managed signal terminal V, control the electrical connection between the first node N1 and the second node N2, and control the electrical connection between the to-be-managed signal terminal V and the ground signal input terminal, so as to keep the potential of the to-be-managed signal terminal V in the current state and meet the normal working requirement in the normal output stage according to the potential state of the to-be-managed signal terminal V; in the discharging stage, the electrical connection between the second node N2 and the to-be-managed signal terminal V is controlled to be disconnected, the electrical connection between the first node N1 and the second node N2 is controlled to be connected, and the electrical connection between the to-be-managed signal terminal V and the ground signal input terminal is controlled to be connected, so as to quickly discharge the to-be-managed signal terminal V and control the potential of the to-be-managed signal terminal V to be stable.

[0071] Therefore, the voltage management circuit provided in the embodiments of the present disclosure can automatically identify whether the to-be-managed signal terminal V is in the floating state, enter the normal output stage when the to-be-managed signal terminal V is not in the floating state, and automatically enter the discharging stage when the to-be-managed signal terminal V is in the floating state, so as to realize quick discharging. The voltage management circuit provided in the embodiments of the present disclosure can automatically manage the power-off state of the to-be-managed signal terminal V, thereby solving the problem that the voltage signal received by the driving integrated circuit in the display module is abnormal, which easily leads to uncontrolled power-on logic and voltage of the driving integrated circuit and further causes display abnormality of the display module, resulting in production and verification loss and other problems.

[0072] The voltage management circuit provided in the embodiments of the present disclosure can realize power-on and power-off according to the timing voltage requirement of the Driver IC when the display module is powered on and powered off in different lighting devices and modes, thereby ensuring that the optimal power-on and power-off mode can be obtained under different Driver IC external direct supply voltage source schemes and different lighting device conditions, and realizing improvement of the display effect of the display module under external direct supply voltage.

[0073] In addition, the voltage management circuit provided in the embodiments of the present disclosure does not need to introduce an additional control signal, and the overall power consumption is controllable.

[0074] As shown in FIG. 2, in some embodiments, the second node control sub-circuit 30 includes:

[0075] The voltage division module 301 is coupled with the to-be-managed signal terminal V, the ground signal input terminal and the third node N3 respectively, and is configured to control the potential of the third node N3;

[0076] The storage module 302 has a first end coupled with the second node N2 and a second end coupled with the ground signal input terminal.

[0077] A unidirectional conduction module 303, a first end of the unidirectional conduction module 303 is coupled with the third node N3, a second end of the unidirectional conduction module 303 is coupled with the second node N2.

[0078] As shown in FIG. 4 and FIG. 8, the voltage division module 301 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is coupled with the signal end V to be managed, a second end of the first resistor R1 is coupled with the third node N3; a first end of the second resistor R2 is coupled with the third node N3, a second end of the second resistor R2 is coupled with the ground signal input end. For example, the resistance of the first resistor R1 is between 1.5KΩ-2.5KΩ, which can be specifically 1.5KΩ, 1.7KΩ, 1.9KΩ, 2.0KΩ, 2.2KΩ, 2.4KΩ, 2.5KΩ, etc., but not limited to this. For example, the resistance of the second resistor R2 is between 30KΩ-36KΩ, which can be specifically 30KΩ, 31KΩ, 32KΩ, 33KΩ, 34KΩ, 35KΩ, 36KΩ, etc., but not limited to this.

[0079] As shown in FIG. 4 and FIG. 8, the storage module 302 includes a storage capacitor C1, a first end of the storage capacitor C1 is coupled with the second node N2, a second end of the storage capacitor C1 is coupled with the ground signal input end. For example, the capacitance of the storage capacitor C1 is between 80μF-120μF, which can be specifically 80μF, 90μF, 100μF, 110μF, 120μF, etc.

[0080] As shown in FIG. 4 and FIG. 8, the unidirectional conduction module 303 includes a diode D, a first pole of the diode D is coupled with the third node N3, a second pole of the diode D is coupled with the second node N2.

[0081] The above-mentioned second node control sub-circuit 30 includes a voltage division module 301, a storage module 302 and a unidirectional conduction module 303, so that the voltage division module 301 can control the potential of the third node N3, the unidirectional conduction module 303 can be turned on or off according to the potential of the third node N3, thereby realizing the control of the potential of the second node N2; the storage module 302 can store the electrical signal written to the third node N3 through the unidirectional conduction module 303, and maintain the potential of the third node N3.

[0082] As shown in FIG. 4 and FIG. 8, in some embodiments, the first node control sub-circuit 20 includes a first transistor T1, a gate of the first transistor T1 is coupled with the signal end V to be managed, a first pole of the first transistor T1 is coupled with the second node N2, a second pole of the first transistor T1 is coupled with the first node N1.

[0083] In some embodiments, the output control sub-circuit 10 comprises a second transistor T2, a gate of the second transistor T2 is coupled with the first node N1, a first pole of the second transistor T2 is coupled with the signal terminal V to be managed, and a second pole of the second transistor T2 is coupled with the ground signal input terminal.

[0084] For example, one of the first pole and the second pole of each transistor above is a source pole, and the other is a drain pole.

[0085] As shown in FIG. 3, in some embodiments, the voltage management circuit further comprises:

[0086] a load sub-circuit 40, the first node control sub-circuit 20 is coupled with the signal terminal V to be managed through the load sub-circuit 40; and / or,

[0087] a first discharge sub-circuit 50, a first end of the first discharge sub-circuit 50 is coupled with the first node N1, and a second end of the first discharge sub-circuit 50 is coupled with the ground signal input terminal; and / or,

[0088] a second discharge sub-circuit 60, the output control sub-circuit 10 is coupled with the signal terminal V to be managed through the second discharge sub-circuit 60.

[0089] As shown in FIG. 4 and FIG. 8, for example, the load sub-circuit 40 comprises a third resistor R3, a first end of the third resistor R3 is coupled with the signal terminal V to be managed, and a second end of the third resistor R3 is coupled with the first node control sub-circuit 20. For example, the resistance value of the third resistor R3 is between 30KΩ and 36KΩ, and can be specifically 30KΩ, 31KΩ, 32KΩ, 33KΩ, 34KΩ, 35KΩ, 36KΩ, etc., but is not limited thereto.

[0090] As shown in FIG. 4 and FIG. 8, for example, the first discharge sub-circuit 50 comprises a fourth resistor R4, a first end of the fourth resistor R4 is coupled with the first node N1, and a second end of the fourth resistor R4 is coupled with the ground signal input terminal. For example, the resistance value of the fourth resistor R4 is between 18KΩ and 22KΩ, and can be specifically 18KΩ, 19KΩ, 20KΩ, 21KΩ, 22KΩ, etc., but is not limited thereto.

[0091] As shown in FIG. 4 and FIG. 8, the second discharge sub-circuit 60 includes a fifth resistor R5, a first end of the fifth resistor R5 is coupled with the to-be-managed signal end V, and a second end of the fifth resistor R5 is coupled with the output control sub-circuit 10. For example, the resistance of the fifth resistor R5 is between 18KΩ and 22KΩ, and can be specifically 18KΩ, 19KΩ, 20KΩ, 21KΩ, 22KΩ, etc., but is not limited thereto.

[0092] The voltage management circuit further includes the load sub-circuit 40, the first discharge sub-circuit 50 and / or the second discharge sub-circuit 60. The load sub-circuit 40 and the second discharge sub-circuit 60 function as current limiting, and the first discharge sub-circuit 50 can limit the discharging speed of the N1 node to avoid too fast discharging of the N1 node.

[0093] As shown in FIG. 4 to FIG. 7, in some embodiments, the to-be-managed signal end V includes a to-be-managed negative voltage signal end V1, the first transistor T1 includes an N-type transistor, the second transistor T2 includes a P-type transistor, the first pole of the diode D includes a cathode, and the second pole of the diode D includes an anode.

[0094] The specific working process of the voltage management circuit is as follows:

[0095] In the normal output stage, that is, the voltage of the to-be-managed negative voltage signal end V1 is the same as the working voltage of the Driver IC, as shown in FIG. 5, taking the voltage of the to-be-managed negative voltage signal end V1 as-10V as an example, in this stage, the voltage of the to-be-managed negative voltage signal end V1 is written into the first end of the storage capacitor C1 through the first resistor R1 and the diode D, and due to the voltage drop of the first resistor R1 and the diode D, the absolute value of the voltage written into the first pole (for example, the source) of the first transistor T1 is less than the absolute value of the voltage written into the gate of the first transistor T1 through the third resistor R3, the gate voltage of the first transistor T1 is about-10V, the gate-source voltage Vgs of the first transistor T1 is less than 0, at this time, the first transistor T1 is in the closed state, the voltage of the first node N1 is about equal to the ground voltage due to the action of the fourth resistor R4, the voltage of the first pole (for example, the source) of the second transistor T2 is-10V, and the gate-source voltage Vgs of the second transistor T2 is greater than 0, at this time, the second transistor T2 is in the closed state, which ensures that the voltage of the to-be-managed negative voltage signal end V1 is the same as the working voltage of the Driver IC, and ensures that the Driver IC is normally powered on.

[0096] In the discharging phase, as shown in FIG. 6, the to-be-managed negative voltage signal end V1 is in a suspended state, and the absolute value of the voltage of the to-be-managed negative voltage signal end V1 gradually decreases (illustrated as -5V). Under the action of the diode D, the voltage of the to-be-managed negative voltage signal end V1 cannot pass through the diode D, the voltage of the first electrode (for example, the source electrode) of the first transistor T1 remains unchanged, the voltage of the to-be-managed negative voltage signal end V1 is written into the gate electrode of the first transistor T1 through the third resistor R3, and the voltage of the gate electrode of the first transistor T1 is greater than the voltage of the first electrode of the first transistor T1. At this time, the gate-source voltage Vgs of the first transistor T1 is greater than the threshold voltage Vth of the first transistor T1, that is, Vgs>Vth>0. At this time, the first transistor T1 is in an open state, which ensures that the to-be-managed negative voltage signal end V1 in the suspended state is accurately identified. The voltage of the first node N1 is approximately equal to the voltage of the first electrode of the first transistor T1, the storage capacitor C1 continuously discharges to maintain the voltage of the first node N1, the voltage of the first node N1 is less than the voltage of the first electrode (for example, the source electrode) of the second transistor T2, and the absolute value of the gate-source voltage Vgs of the second transistor T2 is greater than the threshold voltage Vth of the second transistor T2, that is, |Vgs|>|Vth|>0. At this time, the second transistor T2 is in an open state, which ensures that the abnormal voltage value of the to-be-managed negative voltage signal end V1 in the suspended state is quickly discharged through the fifth resistor R5.

[0097] After the discharging phase ends, as shown in FIG. 7, the gate voltage and the source voltage of the first transistor T1 and the second transistor T2 are both approximately equal to the voltage of the ground signal, and the gate-source voltage of the two transistors does not satisfy the opening threshold value, so the first transistor T1 and the second transistor T2 are both closed.

[0098] It should be noted that in FIGS. 5-7, the voltage values of the nodes obtained by using a voltage source to test the current state are illustrated, and the voltage values are only obtained during testing. The voltage values may change over time. For example, as shown in FIG. 5, the first node N1 continuously discharges through the fourth resistor R4, and the final potential may be approximately equal to the potential of the ground signal.

[0099] As shown in FIG. 8, in some embodiments, the to-be-managed signal end V includes a to-be-managed positive voltage signal end V2, the first transistor T1 includes a P-type transistor, the second transistor T2 includes an N-type transistor, the first electrode of the diode D includes an anode, and the second electrode of the diode D includes a cathode.

[0100] In the normal output phase, that is, the voltage of the to-be-managed positive voltage signal end V2 is the same as the working voltage of the Driver IC. In this phase, the first transistor T1 and the second transistor T2 are both in a closed state, which ensures that the voltage of the to-be-managed positive voltage signal end V2 is the same as the working voltage of the Driver IC, and guarantees that the Driver IC is normally powered on.

[0101] In the discharging phase, the to-be-managed positive voltage signal end V2 is in a suspended state, at this time, the first transistor T1 is in an open state, and the second transistor T2 is in an open state, so as to ensure that the abnormal voltage value of the suspended to-be-managed positive voltage signal end V2 is quickly discharged through the fifth resistor R5.

[0102] After the discharging phase ends, the first transistor T1 and the second transistor T2 are both closed.

[0103] As shown in FIG. 10, the display module provided by the embodiment of the present disclosure also includes the voltage management circuit provided by the above-mentioned embodiment; and further includes a driving circuit, which includes a voltage signal input end Vin, and the voltage signal input end Vin is coupled with the to-be-managed signal end V of the voltage management circuit.

[0104] For example, the display module includes a display panel and a flexible circuit board MFPC, the flexible circuit board MFPC is bound to a non-display area of the display panel; the driving circuit is located in the non-display area of the display panel, and the voltage management circuit is located on the flexible circuit board MFPC.

[0105] As shown in FIG. 10, the display area AA of the display panel and the shift register GOA located in the non-display area are illustrated.

[0106] It should be noted that when the display module is applied to a display device, the display device can be any product or component with a display function, such as a television, a display, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device further includes a flexible circuit board MFPC, a printed circuit board, a back plate, etc.

[0107] Since the voltage management circuit provided by the above-mentioned embodiment can automatically identify whether the to-be-managed signal end V is in a suspended state, when the to-be-managed signal end V is not in a suspended state, the normal output phase is entered, and when the to-be-managed signal end V is in a suspended state, the discharging phase is entered. The voltage management circuit provided by the above-mentioned embodiment can automatically manage the power-off state of the to-be-managed signal end V, thereby solving the problem that the voltage signal received by the driving integrated circuit in the display module is abnormal, which easily leads to uncontrolled power-on logic and voltage of the driving integrated circuit. Therefore, when the display module provided by the embodiment of the present disclosure includes the above-mentioned voltage management circuit, the display quality of the display module can be ensured, and display abnormalities can be avoided.

[0108] The voltage management circuit is arranged in the display module, is not limited by a lighting device, and can avoid power-on and power-off abnormalities in any lighting environment. Moreover, the voltage management circuit is arranged in the display module, and an external direct voltage source scheme of a driver IC can be flexibly managed, so that when the external direct voltage source scheme is changed, the external device does not need to be changed, and only the working state of the voltage management circuit in the display module needs to be changed.

[0109] The disclosure also provides a driving method of a voltage management circuit, used for driving the voltage management circuit provided in the above embodiments; the driving method comprises:

[0110] In the normal output stage, the output control sub-circuit 10 controls the electrical connection between the to-be-managed signal end V and the ground signal input end to be disconnected under the control of the potential of the first node N1; the first node control sub-circuit 20 controls the electrical connection between the first node N1 and the second node N2 to be disconnected under the control of the potential of the to-be-managed signal end V; and the second node control sub-circuit 30 controls the electrical connection between the second node N2 and the to-be-managed signal end V to be connected under the control of the potential of the to-be-managed signal end V.

[0111] In the discharging stage, the output control sub-circuit 10 controls the electrical connection between the to-be-managed signal end V and the ground signal input end to be connected under the control of the potential of the first node N1; the first node control sub-circuit 20 controls the electrical connection between the first node N1 and the second node N2 to be connected under the control of the potential of the to-be-managed signal end V; and the second node control sub-circuit 30 controls the electrical connection between the second node N2 and the to-be-managed signal end V to be disconnected under the control of the potential of the to-be-managed signal end V.

[0112] When the driving method provided in the embodiments of the disclosure is used to drive the voltage management circuit, the electrical connection between the second node N2 and the to-be-managed signal end V can be controlled to be connected, the electrical connection between the first node N1 and the second node N2 can be controlled to be disconnected, and the electrical connection between the to-be-managed signal end V and the ground signal input end can be controlled to be disconnected in the normal output stage according to the potential state of the to-be-managed signal end V, so that the potential of the to-be-managed signal end V is kept in the current state and the normal working requirement is met; in the discharging stage, the electrical connection between the second node N2 and the to-be-managed signal end V can be controlled to be disconnected, the electrical connection between the first node N1 and the second node N2 can be controlled to be connected, and the electrical connection between the to-be-managed signal end V and the ground signal input end can be controlled to be connected, so that the to-be-managed signal end V is quickly discharged and the potential of the to-be-managed signal end V is controlled to be stable.

[0113] Therefore, when the driving method is used to drive the voltage management circuit, whether the to-be-managed signal end V is in a suspended state can be automatically identified, and when the to-be-managed signal end V is not in the suspended state, the normal output stage is entered, and when the to-be-managed signal end V is in the suspended state, the discharging stage is entered. When the driving method provided by the embodiment of the present disclosure is used to drive the voltage management circuit, the to-be-managed signal end V can be automatically managed in a powered-off state, thereby solving the problem that the voltage signal received by the driving integrated circuit in the display module is abnormal, which easily leads to uncontrolled power-on logic and voltage of the driving integrated circuit, and further causes display abnormality of the display module, resulting in production and verification loss and other problems.

[0114] In some embodiments, the driving method further includes:

[0115] After the discharging stage ends, the output control sub-circuit 10 controls to disconnect the electrical connection between the to-be-managed signal end V and the ground signal input end under the control of the potential of the first node N1; and the first node control sub-circuit 20 controls to disconnect the electrical connection between the first node N1 and the second node N2 under the control of the potential of the to-be-managed signal end V.

[0116] In some embodiments, the second node control sub-circuit 30 includes a voltage division module 301, a storage module 302, and a unidirectional conduction module 303, the voltage division module 301 is coupled with the to-be-managed signal end V, the ground signal input end, and a third node N3 respectively, and is configured to control the potential of the third node N3; a first end of the storage module 302 is coupled with the second node N2, and a second end of the storage module 302 is coupled with the ground signal input end; a first end of the unidirectional conduction module 303 is coupled with the third node N3, and a second end of the unidirectional conduction module 303 is coupled with the second node N2.

[0117] In the normal output stage, the unidirectional conduction module 303 turns on the electrical connection between the third node N3 and the second node N2 under the control of the potential of the third node N3;

[0118] In the discharging stage, the unidirectional conduction module 303 disconnects the electrical connection between the third node N3 and the second node N2 under the control of the potential of the third node N3.

[0119] In some embodiments, the first node control sub-circuit 20 comprises a first transistor T1, a gate of the first transistor T1 is coupled with the signal terminal V to be managed, a first pole of the first transistor T1 is coupled with the second node N2, and a second pole of the first transistor T1 is coupled with the first node N1; the output control sub-circuit 10 comprises a second transistor T2, a gate of the second transistor T2 is coupled with the first node N1, a first pole of the second transistor T2 is coupled with the signal terminal V to be managed, and a second pole of the second transistor T2 is coupled with the ground signal input terminal;

[0120] In the normal output stage, under the control of the potential of the first node N1, the second transistor T2 is turned off; under the control of the potential of the signal terminal V to be managed, the first transistor T1 is turned off;

[0121] In the discharging stage, under the control of the potential of the first node N1, the second transistor T2 is turned on; under the control of the potential of the signal terminal V to be managed, the first transistor T1 is turned on;

[0122] After the discharging stage, under the control of the potential of the first node N1, the second transistor T2 is turned off; under the control of the potential of the signal terminal V to be managed, the first transistor T1 is turned off.

[0123] In the method embodiments of the present disclosure, the serial numbers of the steps cannot be used to limit the sequence of the steps, and for those skilled in the art, the sequence of the steps can be changed without creative effort, which is within the protection scope of the present disclosure.

[0124] It should be noted that each embodiment in the present specification is described in a progressive manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments. Especially, for the method embodiments, since they are basically similar to the product embodiments, the description is relatively simple, and the related parts can be referred to the part of the description of the product embodiments.

[0125] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the same meaning as commonly understood by one of ordinary skill in the art to which this present disclosure belongs. The terms "first", "second", and similar terms are used to distinguish one element from another, and are not necessarily used to describe a sequential or chronological order. The terms "comprises", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected", "coupled", or any variant thereof are intended to cover a connection or coupling between or among two or more elements, and can encompass a direct connection or coupling or an indirect connection or coupling through one or more additional elements. The terms "upper", "lower", "left", "right", and the like are used to denote relative positions and can change according to an absolute position of the described object.

[0126] It can be understood that when an element such as a layer, a film, a region, or a substrate is referred to as being "on" or "under" another element, it can be directly on or under the other element, or one or more intervening elements can also be present.

[0127] In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0128] The above description is merely illustrative of the disclosure and does not limit the scope of the disclosure. Any modifications made within the spirit and principles of the disclosure shall be considered within the scope of the disclosure. Therefore, the scope of the disclosure should be determined by the scope of the claims.

Claims

1. A voltage management circuit, comprising: an output control sub-circuit coupled to a first node, a signal to be managed, and a ground signal input, respectively; a first node control sub-circuit coupled to the first node, a second node, and the signal to be managed, respectively; and a second node control sub-circuit coupled to the second node, the signal to be managed, and the ground signal input, respectively. The second node control sub-circuit comprises:

2. The voltage management circuit of claim 1, wherein, a voltage dividing module coupled to the signal to be managed, the ground signal input, and a third node, respectively; and a storage module having a first end coupled to the second node and a second end coupled to the ground signal input. The voltage dividing module comprises a first resistor having a first end coupled to the signal to be managed and a second end coupled to the third node, and a second resistor having a first end coupled to the third node and a second end coupled to the ground signal input. The storage module comprises a storage capacitor having a first end coupled to the second node and a second end coupled to the ground signal input. The second node control sub-circuit further comprises a unidirectional conduction module having a first end coupled to the third node and a second end coupled to the second node. The first node control sub-circuit comprises a first transistor having a gate coupled to the signal to be managed, a first pole coupled to the second node, and a second pole coupled to the first node. The output control sub-circuit comprises a second transistor having a gate coupled to the first node, a first pole coupled to the signal to be managed, and a second pole coupled to the ground signal input. The signal to be managed comprises a negative voltage signal to be managed, the first transistor comprises an N-type transistor, the second transistor comprises a P-type transistor, the unidirectional conduction module comprises a diode having a first pole comprising a cathode and a second pole comprising an anode.

4. The voltage management circuit of claim 3, wherein, The signal to be managed comprises a positive voltage signal to be managed, the first transistor comprises a P-type transistor, the second transistor comprises an N-type transistor, the unidirectional conduction module comprises a diode having a first pole comprising an anode and a second pole comprising a cathode.

5. The voltage management circuit of claim 4, wherein, The voltage management circuit further comprises:

6. The voltage management circuit of claim 5, wherein, a first node control sub-circuit coupled to the first node, a second node, and the signal to be managed, respectively; and 7. The voltage management circuit of claim 5, wherein, a second node control sub-circuit coupled to the second node, the signal to be managed, and the ground signal input, respectively.

8. The voltage management circuit of any one of claims 1-7, wherein, The second node control sub-circuit comprises: a voltage dividing module coupled to the signal to be managed, the ground signal input, and a third node, respectively; and a storage module having a first end coupled to the second node and a second end coupled to the ground signal input. The voltage dividing module comprises a first resistor having a first end coupled to the signal to be managed and a second end coupled to the third node, and a second resistor having a first end coupled to the third node and a second end coupled to the ground signal input. The storage module comprises a storage capacitor having a first end coupled to the second node and a second end coupled to the ground signal input. The second node control sub-circuit further comprises a unidirectional conduction module having a first end coupled to the third node and a second end coupled to the second node. The first node control sub-circuit comprises a first transistor having a gate coupled to the signal to be managed, a first pole coupled to the second node, and a second pole coupled to the first node. The output control sub-circuit comprises a second transistor having a gate coupled to the first node, a first pole coupled to the signal to be managed, and a second pole coupled to the ground signal input. The signal to be managed comprises a negative voltage signal to be managed, the first transistor comprises an N-type transistor, the second transistor comprises a P-type transistor, the unidirectional conduction module comprises a diode having a first pole comprising a cathode and a second pole comprising an anode. The signal to be managed comprises a positive voltage signal to be managed, the first transistor comprises a P-type transistor, the second transistor comprises an N-type transistor, the unidirectional conduction module comprises a diode having a first pole comprising an anode and a second pole comprising a cathode. a load sub-circuit, the first node control sub-circuit being coupled to the signal terminal to be managed through the load sub-circuit; and / or a first discharging sub-circuit, a first end of the first discharging sub-circuit being coupled to the first node, and a second end of the first discharging sub-circuit being coupled to the ground signal input terminal; and / or a second discharging sub-circuit, the output control sub-circuit being coupled to the signal terminal to be managed through the second discharging sub-circuit.

9. The voltage management circuit according to claim 8, wherein the load sub-circuit comprises a third resistor, a first end of the third resistor being coupled to the signal terminal to be managed, and a second end of the third resistor being coupled to the first node control sub-circuit; the first discharging sub-circuit comprises a fourth resistor, a first end of the fourth resistor being coupled to the first node, and a second end of the fourth resistor being coupled to the ground signal input terminal; the second discharging sub-circuit comprises a fifth resistor, a first end of the fifth resistor being coupled to the signal terminal to be managed, and a second end of the fifth resistor being coupled to the output control sub-circuit.

10. A display module comprising the voltage management circuit according to any one of claims 1 to 9; and further comprising a driving circuit, the driving circuit comprising a voltage signal input terminal, the voltage signal input terminal being coupled to the signal terminal to be managed of the voltage management circuit.

11. The display module of claim 10, wherein, the display module comprises a display panel and a flexible circuit board, the flexible circuit board being bonded to a non-display region of the display panel; the driving circuit is located in the non-display region of the display panel, and the voltage management circuit is located on the flexible circuit board.

12. A driving method of a voltage management circuit for driving the voltage management circuit according to any one of claims 1 to 9. the driving method comprises: in a normal output stage, the output control sub-circuit controls to disconnect the electrical connection between the signal terminal to be managed and the ground signal input terminal under the control of the potential of the first node; the first node control sub-circuit controls to disconnect the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed; and the second node control sub-circuit controls to connect the electrical connection between the second node and the signal terminal to be managed under the control of the potential of the signal terminal to be managed; in a discharging stage, the output control sub-circuit controls to connect the electrical connection between the signal terminal to be managed and the ground signal input terminal under the control of the potential of the first node; the first node control sub-circuit controls to connect the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed; and the second node control sub-circuit controls to disconnect the electrical connection between the second node and the signal terminal to be managed under the control of the potential of the signal terminal to be managed.

13. The driving method of the voltage management circuit according to claim 12, wherein, the driving method further comprises: after the discharging stage ends, the output control sub-circuit controls to disconnect the electrical connection between the signal terminal to be managed and the ground signal input terminal under the control of the potential of the first node; and the first node control sub-circuit controls to disconnect the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed.

14. The driving method of the voltage management circuit according to claim 12, wherein, The second node control sub-circuit comprises a voltage division module, a storage module and a one-way conduction module, the voltage division module is coupled with the signal terminal to be managed, the ground signal input terminal and a third node respectively, and is configured to control the potential of the third node; a first end of the storage module is coupled with the second node, and a second end of the storage module is coupled with the ground signal input terminal; a first end of the one-way conduction module is coupled with the third node, and a second end of the one-way conduction module is coupled with the second node; In the normal output stage, the one-way conduction module is controlled by the potential of the third node to turn on the electrical connection between the third node and the second node; In the discharging stage, the one-way conduction module is controlled by the potential of the third node to disconnect the electrical connection between the third node and the second node.

15. The driving method of the voltage management circuit according to claim 13, wherein, The first node control sub-circuit comprises a first transistor, a gate of the first transistor is coupled with the signal terminal to be managed, a first pole of the first transistor is coupled with the second node, and a second pole of the first transistor is coupled with the first node; The output control sub-circuit comprises a second transistor, a gate of the second transistor is coupled with the first node, a first pole of the second transistor is coupled with the signal terminal to be managed, and a second pole of the second transistor is coupled with the ground signal input terminal; In the normal output stage, the second transistor is closed under the control of the potential of the first node; The first transistor is closed under the control of the potential of the signal terminal to be managed; In the discharging stage, the second transistor is turned on under the control of the potential of the first node; The first transistor is turned on under the control of the potential of the signal terminal to be managed; After the discharging stage ends, the second transistor is closed under the control of the potential of the first node; The first transistor is closed under the control of the potential of the signal terminal to be managed.

Images