Voltage management circuit, driving method thereof and display module

Abstract

The invention provides a voltage management circuit and a driving method thereof, and a display module, relates to the technical field of display, and aims to solve the problems that a voltage signal received by a driving integrated circuit in the display module is abnormal, so that the power-on logic and voltage of the driving integrated circuit are easy to be uncontrolled, and the display of the display module is abnormal. And the production and verification loss is caused. In the voltage management circuit, an output control sub-circuit is respectively coupled with a first node, a to-be-managed signal end and a ground signal input end, and is used for controlling connection or disconnection of electric connection between the to-be-managed signal end and the ground signal input end; the first node control sub-circuit is respectively coupled with the first node, the second node and a to-be-managed signal end, and is used for controlling the connection or disconnection of the electric connection between the first node and the second node; the second node control sub-circuit is respectively coupled with a second node, a to-be-managed signal end and a ground signal input end; and the control module is used for controlling connection or disconnection of electric connection between the second node and the to-be-managed signal end.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a voltage management circuit and a driving method thereof, and a display module. Background Art

[0002] In the process of organic light-emitting diode (OLED) display module from production to terminal use, the lighting device uses the boost conversion circuit of the lighting machine power supply or power integrated circuit (Power IC) as an external direct voltage source, and outputs the required working voltage to the driver integrated circuit (Driver IC) in the OLED display module through the external direct voltage source. However, almost all lighting machine power supplies and some Power ICs do not have the function of managing the output voltage state after power-off. As a result, it is easy for the voltage output end of the external direct voltage source to be in a suspended state after power-off, resulting in abnormal potential of the voltage output end. This abnormality is particularly serious when the voltage output end is used to provide a negative working voltage. When the lighting device performs a second lighting, the Driver IC power-on logic and voltage will be uncontrolled. The abnormality of the Driver IC power-on will further cause abnormal display of the OLED display module, resulting in production and verification losses. Summary of the invention

[0003] The purpose of the present invention is to provide a voltage management circuit and its driving method, and a display module, which are used to solve the problem that the voltage signal received by the driver integrated circuit in the display module is abnormal, which easily leads to the power-on logic and voltage of the driver integrated circuit being uncontrolled, further causing abnormal display of the display module, resulting in production and verification losses, and other problems.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A first aspect of the present invention provides a voltage management circuit, comprising:

[0006] an output control subcircuit, coupled to the first node, the signal terminal to be managed and the ground signal input terminal respectively; and used for controlling the conduction or disconnection of 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;

[0007] A first node control subcircuit is coupled to the first node, the second node and the signal terminal to be managed, respectively; and is used to control the conduction or disconnection of the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed;

[0008] The second node control subcircuit is coupled to the second node, the signal terminal to be managed and the ground signal input terminal respectively; and is used to control the conduction or disconnection of 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.

[0009] Optionally, the second node control subcircuit includes:

[0010] A voltage dividing module, coupled to the to-be-managed signal terminal, the ground signal input terminal and the third node respectively; and used to control the potential of the third node;

[0011] a storage module, wherein a first terminal of the storage module is coupled to the second node, and a second terminal of the storage module is coupled to the ground signal input terminal;

[0012] A one-way conducting module, wherein a first end of the one-way conducting module is coupled to the third node, and a second end of the one-way conducting module is coupled to the second node.

[0013] Optionally, the voltage divider module includes a first resistor and a second resistor, wherein a first end of the first resistor is coupled to the signal end to be managed, and a second end of the first resistor is coupled to the third node; a first end of the second resistor is coupled to the third node, and a second end of the second resistor is coupled to the ground signal input end;

[0014] The storage module comprises a storage capacitor, a first end of the storage capacitor is coupled to the second node, and a second end of the storage capacitor is coupled to the ground signal input terminal;

[0015] The unidirectional conduction module includes a diode, a first electrode of the diode is coupled to the third node, and a second electrode of the diode is coupled to the second node.

[0016] Optionally, the first node control subcircuit includes a first transistor, a gate of the first transistor is coupled to the signal terminal to be managed, a first electrode of the first transistor is coupled to the second node, and a second electrode of the first transistor is coupled to the first node.

[0017] Optionally, the output control subcircuit includes a second transistor, a gate of the second transistor is coupled to the first node, a first electrode of the second transistor is coupled to the signal terminal to be managed, and a second electrode of the second transistor is coupled to the ground signal input terminal.

[0018] Optionally, the signal terminal to be managed includes a negative voltage signal terminal to be managed, the first transistor includes an N-type transistor, the second transistor includes a P-type transistor, the first electrode of the diode includes a cathode, and the second electrode of the diode includes an anode.

[0019] Optionally, the signal terminal to be managed includes a positive voltage signal terminal to be managed, the first transistor includes a P-type transistor, the second transistor includes an N-type transistor, the first electrode of the diode includes an anode, and the second electrode of the diode includes a cathode.

[0020] Optionally, the voltage management circuit further includes:

[0021] a load subcircuit, wherein the first node control subcircuit is coupled to the signal terminal to be managed through the load subcircuit; and / or,

[0022] a first discharge subcircuit, wherein a first terminal of the first discharge subcircuit is coupled to the first node, and a second terminal of the first discharge subcircuit is coupled to the ground signal input terminal; and / or,

[0023] A second discharge subcircuit, wherein the output control subcircuit is coupled to the signal terminal to be managed through the second discharge subcircuit.

[0024] Optionally, the load subcircuit includes a third resistor, a first end of the third resistor is coupled to the signal end to be managed, and a second end of the third resistor is coupled to the first node control subcircuit;

[0025] The first discharge subcircuit comprises a fourth resistor, a first end of the fourth resistor is coupled to the first node, and a second end of the fourth resistor is coupled to the ground signal input terminal;

[0026] The second discharge subcircuit includes a fifth resistor, a first end of the fifth resistor is coupled to the to-be-managed signal end, and a second end of the fifth resistor is coupled to the output control subcircuit.

[0027] Based on the technical solution of the above-mentioned voltage management circuit, the second aspect of the present invention provides a display module, including the above-mentioned voltage management circuit; and also includes a driving circuit, the driving circuit including a voltage signal input terminal, and the voltage signal input terminal is coupled to the signal terminal to be managed of the voltage management circuit.

[0028] Optionally, the display module includes a display panel and a flexible circuit board, and the flexible circuit board is bound to a non-display area of ​​the display panel;

[0029] The driving circuit is located in a non-display area of ​​the display panel, and the voltage management circuit is located on the flexible circuit board.

[0030] Based on the technical solution of the above voltage management circuit, a third aspect of the present invention provides a driving method of a voltage management circuit, which is used to drive the above voltage management circuit; the driving method comprises:

[0031] In the normal output stage, the output control subcircuit controls the disconnection of 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 subcircuit controls the disconnection of the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed; the second node control subcircuit controls the conduction of 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;

[0032] In the discharge stage, the output control subcircuit controls 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 subcircuit controls 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 subcircuit controls 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.

[0033] Optionally, the driving method further includes:

[0034] After the discharge stage, the output control subcircuit controls the disconnection of 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 subcircuit controls the disconnection of the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed.

[0035] Optionally, the second node control subcircuit comprises: a voltage dividing module, a storage module and a unidirectional conduction module, wherein the voltage dividing module is coupled to the signal terminal to be managed, the ground signal input terminal and the third node respectively, and is used to control the potential of the third node; a first end of the storage module is coupled to the second node, and a second end of the storage module is coupled to the ground signal input terminal; a first end of the unidirectional conduction module is coupled to the third node, and a second end of the unidirectional conduction module is coupled to the second node;

[0036] In the normal output stage, the unidirectional conduction module conducts the electrical connection between the third node and the second node under the control of the potential of the third node;

[0037] In the discharge phase, the unidirectional conduction module disconnects the electrical connection between the third node and the second node under the control of the potential of the third node.

[0038] Optionally, the first node control subcircuit includes a first transistor, a gate of the first transistor is coupled to the signal terminal to be managed, a first electrode of the first transistor is coupled to the second node, and a second electrode of the first transistor is coupled to the first node; the output control subcircuit includes a second transistor, a gate of the second transistor is coupled to the first node, a first electrode of the second transistor is coupled to the signal terminal to be managed, and a second electrode of the second transistor is coupled to the ground signal input terminal;

[0039] In the normal output stage, under the control of the potential of the first node, the second transistor is turned off; under the control of the potential of the signal terminal to be managed, the first transistor is turned off;

[0040] In the discharge phase, under the control of the potential of the first node, the second transistor is turned on; under the control of the potential of the signal terminal to be managed, the first transistor is turned on;

[0041] After the discharge phase is finished, under the control of the potential of the first node, the second transistor is turned off; under the control of the potential of the signal terminal to be managed, the first transistor is turned off.

[0042] In the technical solution provided by the present invention, the second node control subcircuit is controlled by the potential of the signal terminal to be managed, and can control the conduction or disconnection of the electrical connection between the second node and the signal terminal to be managed, thereby controlling the potential of the second node; the first node control subcircuit is controlled by the potential of the signal terminal to be managed, and can control the conduction or disconnection of the electrical connection between the first node and the second node, thereby controlling the potential of the first node; the output control subcircuit is controlled by the potential of the first node, and can control the conduction or disconnection of the electrical connection between the signal terminal to be managed and the ground signal input terminal, thereby controlling the potential of the signal terminal to be managed.

[0043] In the technical solution provided by the present invention, according to the potential state of the signal terminal to be managed, in the normal output stage, the electrical connection between the second node and the signal terminal to be managed is controlled to be turned on, the electrical connection between the first node and the second node is controlled to be disconnected, and the electrical connection between the signal terminal to be managed and the ground signal input terminal is controlled to be disconnected, so as to keep the potential of the signal terminal to be managed in the current state and meet the normal working requirements; in the discharge stage, the electrical connection between the second node and the signal terminal to be managed is controlled to be disconnected, the electrical connection between the first node and the second node is controlled to be turned on, and the electrical connection between the signal terminal to be managed and the ground signal input terminal is controlled to be turned on, so as to realize rapid discharge of the signal terminal to be managed and control the potential of the signal terminal to be managed at a stable ground potential.

[0044] Therefore, in the technical solution provided by the present invention, it is possible to automatically identify whether the signal end to be managed is in a suspended state, and when it is not in a suspended state, it enters the normal output stage, and when it is in a suspended state, it enters the discharge stage. The technical solution provided by the present invention can automatically manage the power-off state of the signal end to be managed, thereby solving the problem that the voltage signal received by the driver integrated circuit in the display module is abnormal, which easily leads to uncontrolled power-on logic and voltage of the driver integrated circuit, and further causes abnormal display of the display module, resulting in production and verification losses.

[0045] The technical solution provided by the present invention can realize powering on and off of the display module according to the Driver IC timing voltage requirements under different lighting devices and modes, thereby ensuring that under different Driver IC external direct supply voltage source schemes and different lighting device conditions, the optimal power-on and power-off methods can be obtained, thereby improving the display effect of the external direct supply voltage of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0047] Figure 1 A schematic diagram of a first module of a voltage management circuit provided by an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of a second module of a voltage management circuit provided by an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of a third module of the voltage management circuit provided in an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of a first circuit structure of a voltage management circuit provided by an embodiment of the present invention;

[0051] Figure 5 for Figure 4 A schematic diagram of the voltage values ​​of each node of the circuit structure in the normal output stage;

[0052] Figure 6 for Figure 4 A schematic diagram of the voltage values ​​of each node of the circuit structure during the discharge phase;

[0053] Figure 7 for Figure 4 A schematic diagram of the voltage values ​​of each node of the circuit structure after the discharge phase ends;

[0054] Figure 8A second circuit structure schematic diagram of a voltage management circuit provided by an embodiment of the present invention;

[0055] Fig. 9 A signal waveform diagram of a signal terminal to be managed provided by an embodiment of the present invention when it is connected to a voltage management circuit and when it is not connected to the voltage management circuit;

[0056] Fig.10 A schematic diagram of connecting a display module to a lighting device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to further illustrate the voltage management circuit and its driving method, and the display module provided by the embodiments of the present invention, a detailed description is given below in conjunction with the accompanying drawings of the specification.

[0058] Research has found that after the lighting device is powered off, the voltage output terminal of the external direct voltage source is easily suspended, resulting in abnormal potential at 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 the capacitor is used as the voltage output terminal, or when parasitic capacitance exists in the power supply circuit. When the lighting device is lit for the second time, the driver IC power-on logic and voltage will be uncontrolled. The abnormal driver IC power-on will further cause abnormal display of the OLED display module, resulting in production and verification losses.

[0059] In order to avoid the above losses, currently the only way is to manually short-circuit the lighting equipment to the ground after the power supply of the lighting equipment is turned off, or to modify the equipment, or to purchase a Power IC with a power-off management function; and the lighting equipment involves many types and a large number from the production end to the terminal. Equipment identification and manual fast discharge consume a lot of human resources, and equipment modification costs a lot in terms of improvement cycle and cost, and the Power IC selection range is small. Therefore, there is an urgent need for an improvement method for automatic fast discharge when the external direct supply voltage is powered off, so that the external direct supply voltage solution is highly related to the OLED display module solution, and the solution can be changed flexibly.

[0060] See also Figure 1 , an embodiment of the present invention provides a voltage management circuit, comprising:

[0061] The output control subcircuit 10 is coupled to the first node N1, the signal terminal to be managed V and the ground signal input terminal respectively; and is used to control the conduction or disconnection of the electrical connection between the signal terminal to be managed V and the ground signal input terminal under the control of the potential of the first node N1;

[0062] A first node control subcircuit 20 is coupled to the first node N1, the second node N2 and the signal terminal V to be managed, respectively; and is used to control the conduction or disconnection 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 to be managed;

[0063] The second node control subcircuit 30 is coupled to the second node N2, the signal terminal V to be managed and the ground signal input terminal respectively; and is used to control the conduction or disconnection of the electrical connection between the second node N2 and the signal terminal V to be managed under the control of the potential of the signal terminal V to be managed.

[0064] Exemplarily, when the voltage management circuit is applied to a display module, the signal terminal V to be managed is coupled to a voltage signal input terminal Vin included in a driving circuit in the display module. The voltage signal input terminal Vin included in the driving circuit is used to receive the required working voltage.

[0065] Exemplarily, when the display module is used in conjunction with a lighting device, the voltage signal input terminal Vin included in the driving circuit is coupled to the voltage output terminal Vout of the external direct-supply voltage source in the lighting device, and is used to receive the operating voltage output by the voltage output terminal Vout of the external direct-supply voltage source. The signal terminal V to be managed coupled to the voltage management circuit can be coupled to the voltage output terminal Vout of the external direct-supply voltage source. It is worth noting that the type of external direct-supply voltage source in the lighting device is not limited to the capacitor output voltage type and the parasitic capacitor type of the power supply output circuit. The external direct-supply voltage of the lighting device is not restricted and can be flexibly increased and decreased. The solution structure can match the external direct-supply voltage management circuit.

[0066] Exemplarily, the ground signal input terminal is used to input a ground signal, and a voltage value of the ground signal is 0V.

[0067] The specific driving methods of the voltage management circuit include:

[0068] In the normal output stage, that is, the voltage output terminal Vout of the external direct voltage source in the lighting device provides the operating voltage to 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 by the voltage management circuit is the same as the operating voltage; in this stage, the second node control subcircuit 30 controls the electrical connection between the second node N2 and the signal terminal V to be managed under the control of the potential of the signal terminal V to be managed; the first node control subcircuit 20 controls the disconnection 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 to be managed; the output control subcircuit 10 controls the disconnection of the electrical connection between the signal terminal V to be managed and the ground signal input terminal 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 to meet the normal working requirements.

[0069] In the discharge stage, that is, the external direct supply voltage source in the lighting device is powered off, and the Driver IC is powered off. In this stage, the second node control subcircuit 30 controls the disconnection of the electrical connection between the second node N2 and the signal terminal V to be managed under the control of the potential of the signal terminal V to be managed; the first node control subcircuit 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 to be managed; the output control subcircuit 10 controls the conduction of the electrical connection between the signal terminal V to be managed and the ground signal input terminal under the control of the potential of the first node N1, so as to discharge the signal terminal V to be managed.

[0070] like Fig. 9 As shown, it illustrates the signal waveform diagram when the external direct supply voltage source in the lighting device is powered off when the signal terminal V to be managed is connected to the voltage management circuit and when it is not connected to the voltage management circuit. Fig. 9 The solid line in represents the signal waveform of the signal terminal V to be managed when the external direct supply voltage source in the lighting device is powered off and the signal terminal V to be managed is not connected to the voltage management circuit. It can be seen that the signal is in an abnormal state. Fig. 9 The dotted line in the figure represents the signal waveform of the signal terminal V to be managed after discharge when the external direct supply voltage source in the lighting device is powered off and the signal terminal V to be managed is connected to the voltage management circuit. It can be seen that the signal has the same potential as the ground signal.

[0071] According to the specific structure of the above-mentioned voltage management circuit, in the voltage management circuit provided by the embodiment of the present invention, the second node control subcircuit 30 is controlled by the potential of the signal terminal V to be managed, and can control the conduction or disconnection of the electrical connection between the second node N2 and the signal terminal V to be managed, thereby controlling the potential of the second node N2; the first node control subcircuit 20 is controlled by the potential of the signal terminal V to be managed, and 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; the output control subcircuit 10 is controlled by the potential of the first node N1, and can control the conduction or disconnection of the electrical connection between the signal terminal V to be managed and the ground signal input terminal, thereby controlling the potential of the signal terminal V to be managed.

[0072] In the voltage management circuit provided in the embodiment of the present invention, according to the potential state of the signal terminal V to be managed, in the normal output stage, it is possible to control the electrical connection between the second node N2 and the signal terminal V to be managed to be turned on, control the electrical connection between the first node N1 and the second node N2 to be turned off, and control the electrical connection between the signal terminal V to be managed and the ground signal input terminal to be turned off, so as to keep the potential of the signal terminal V to be managed in the current state to meet the normal working requirements; in the discharge stage, it is possible to control the electrical connection between the second node N2 and the signal terminal V to be managed to be turned off, control the electrical connection between the first node N1 and the second node N2 to be turned on, and control the electrical connection between the signal terminal V to be managed and the ground signal input terminal to be turned on, so as to realize rapid discharge of the signal terminal V to be managed and control the potential of the signal terminal V to be managed at a stable ground potential.

[0073] Therefore, in the voltage management circuit provided by the embodiment of the present invention, it is possible to automatically identify whether the signal terminal V to be managed is in a suspended state, and when it is not in a suspended state, it enters the normal output stage, and when it is in a suspended state, it automatically enters the discharge stage to achieve rapid discharge. The voltage management circuit provided by the embodiment of the present invention can automatically manage the power-off state of the signal terminal V to be managed, thereby solving the problem that the voltage signal received by the driver integrated circuit in the display module is abnormal, which easily leads to uncontrolled power-on logic and voltage of the driver integrated circuit, and further causes abnormal display of the display module, resulting in production and verification losses.

[0074] The voltage management circuit provided in the embodiment of the present invention can realize power-on and power-off of the display module according to the Driver IC timing voltage requirements under different lighting devices and modes, thereby ensuring that under different Driver IC external direct supply voltage source schemes and different lighting device conditions, the optimal power-on and power-off methods can be obtained, thereby improving the display effect of the external direct supply voltage of the display module.

[0075] In addition, the voltage management circuit provided by the embodiment of the present invention does not need to introduce additional control signals, and the overall power consumption is controllable.

[0076] like Figure 2 As shown, in some embodiments, the second node control subcircuit 30 includes:

[0077] The voltage dividing module 301 is coupled to the to-be-managed signal terminal V, the ground signal input terminal and the third node N3 respectively; and is used to control the potential of the third node N3;

[0078] A storage module 302, wherein a first terminal of the storage module 302 is coupled to the second node N2, and a second terminal of the storage module 302 is coupled to the ground signal input terminal;

[0079] The one-way conducting module 303 has a first end coupled to the third node N3 and a second end coupled to the second node N2.

[0080] like Figure 4 and Figure 8 As shown, exemplarily, the voltage divider module 301 includes a first resistor R1 and a second resistor R2, wherein the first end of the first resistor R1 is coupled to the signal end V to be managed, and the second end of the first resistor R1 is coupled to the third node N3; the first end of the second resistor R2 is coupled to the third node N3, and the second end of the second resistor R2 is coupled to the ground signal input end. For example: the resistance value of the first resistor R1 is between 1.5KΩ and 2.5KΩ, and can be specifically 1.5KΩ, 1.7KΩ, 1.9KΩ, 2.0KΩ, 2.2KΩ, 2.4KΩ, 2.5KΩ, etc., but not limited thereto. For example: the resistance value of the second resistor R2 is between 30KΩ and 36KΩ, and can be specifically 30KΩ, 31KΩ, 32KΩ, 33KΩ, 34KΩ, 35KΩ, 36KΩ, etc., but not limited thereto.

[0081] like Figure 4 and Figure 8 As shown, illustratively, the storage module 302 includes a storage capacitor C1, a first end of the storage capacitor C1 is coupled to the second node N2, and a second end of the storage capacitor C1 is coupled to the ground signal input terminal. For example, the capacitance of the storage capacitor C1 is between 80 μF and 120 μF, and can be specifically 80 μF, 90 μF, 100 μF, 110 μF, 120 μF, etc.

[0082] like Figure 4 and Figure 8As shown, illustratively, the unidirectional conduction module 303 includes a diode D, a first electrode of the diode D is coupled to the third node N3, and a second electrode of the diode D is coupled to the second node N2.

[0083] The above-mentioned setting of the second node control subcircuit 30 includes a voltage divider module 301, a storage module 302 and a unidirectional conduction module 303, so that the voltage divider module 301 can control the potential of the third node N3, and 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 into the third node N3 through the unidirectional conduction module 303 to maintain the potential of the third node N3.

[0084] like Figure 4 and Figure 8 As shown, in some embodiments, the first node control subcircuit 20 includes a first transistor T1, a gate of the first transistor T1 is coupled to the signal terminal V to be managed, a first electrode of the first transistor T1 is coupled to the second node N2, and a second electrode of the first transistor T1 is coupled to the first node N1.

[0085] In some embodiments, the output control subcircuit 10 includes a second transistor T2, a gate of the second transistor T2 is coupled to the first node N1, a first electrode of the second transistor T2 is coupled to the managed signal terminal V, and a second electrode of the second transistor T2 is coupled to the ground signal input terminal.

[0086] Exemplarily, among the first electrode and the second electrode of each of the above transistors, one is a source electrode and the other is a drain electrode.

[0087] like Figure 3 As shown, in some embodiments, the voltage management circuit further includes:

[0088] A load subcircuit 40, wherein the first node control subcircuit 20 is coupled to the signal terminal V to be managed via the load subcircuit 40; and / or,

[0089] a first discharge subcircuit 50, wherein a first terminal of the first discharge subcircuit 50 is coupled to the first node N1, and a second terminal of the first discharge subcircuit 50 is coupled to the ground signal input terminal; and / or,

[0090] The second discharge subcircuit 60 , the output control subcircuit 10 is coupled to the signal terminal V to be managed through the second discharge subcircuit 60 .

[0091] like Figure 4 and Figure 8As shown, illustratively, the load subcircuit 40 includes a third resistor R3, a first end of the third resistor R3 is coupled to the to-be-managed signal end V, and a second end of the third resistor R3 is coupled to the first node control subcircuit 20. For example, the resistance 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.

[0092] like Figure 4 and Figure 8 As shown, illustratively, the first discharge subcircuit 50 includes a fourth resistor R4, a first end of the fourth resistor R4 is coupled to the first node N1, and a second end of the fourth resistor R4 is coupled to the ground signal input terminal. For example, the resistance 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.

[0093] like Figure 4 and Figure 8 As shown, illustratively, the second discharge subcircuit 60 includes a fifth resistor R5, a first end of the fifth resistor R5 is coupled to the to-be-managed signal end V, and a second end of the fifth resistor R5 is coupled to the output control subcircuit 10. For example, the resistance value 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.

[0094] The voltage management circuit in the above-mentioned configuration further includes a load sub-circuit 40, a first discharge sub-circuit 50 and / or a second discharge sub-circuit 60. The load sub-circuit 40 and the second discharge sub-circuit 60 play a role in current limiting. The first discharge sub-circuit 50 can limit the discharge speed of the N1 node to prevent the N1 node from discharging too quickly.

[0095] like Figures 4 to 7 As shown, in some embodiments, the signal terminal V to be managed includes a negative voltage signal terminal V1 to be managed, the first transistor T1 includes an N-type transistor, the second transistor T2 includes a P-type transistor, the first electrode of the diode D includes a cathode, and the second electrode of the diode D includes an anode.

[0096] The specific working process of the voltage management circuit is as follows:

[0097] In the normal output stage, the voltage of the negative voltage signal terminal V1 to be managed is the same as the operating voltage of the Driver IC. Figure 5As shown, taking the voltage of the negative voltage signal terminal V1 to be managed as -10V as an example, at this stage, the voltage of the negative voltage signal terminal V1 to be managed is written into the first end of the storage capacitor C1 through the first resistor R1 and the diode D. Under the voltage drop of the first resistor R1 and the diode D, the absolute value of the voltage written into the first electrode (such as: 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 approximately equal to -10V, and the gate-source voltage Vgs of the first transistor T1 is <0. At this time, the first transistor T1 is in the off state. The voltage of the first node N1 is approximately equal to the ground voltage under the action of the fourth resistor R4. The voltage of the first electrode (such as: source) of the second transistor T2 is -10V, and the gate-source voltage Vgs of the second transistor T2 is >0. At this time, the second transistor T2 is in the off state, ensuring that the voltage of the negative voltage signal terminal V1 to be managed is the same as the working voltage of the Driver IC, ensuring that the Driver IC is powered on normally.

[0098] During the discharge phase, Figure 6 As shown, the negative voltage signal terminal V1 to be managed is in a suspended state, and the absolute value of the voltage of the negative voltage signal terminal V1 to be managed gradually decreases (indicated as -5V). Under the action of the diode D, the voltage of the negative voltage signal terminal V1 to be managed cannot pass through the diode D, and the voltage of the first pole (such as: source) of the first transistor T1 remains unchanged. The voltage of the negative voltage signal terminal V1 to be managed is written into the gate of the first transistor T1 through the third resistor R3. The gate voltage of the first transistor T1 is greater than the first pole voltage of the first transistor T1. At this time, the gate-source voltage Vgs>Vth>0 of the first transistor T1, and Vth is the threshold voltage of the first transistor T1. At this time, the first transistor T1 is in an open state, ensuring accurate identification that the negative voltage signal terminal V1 to be managed is in a suspended state. The voltage of the first node N1 is approximately equal to the voltage of the first electrode of the first transistor T1, and 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 (such as the source) of the second transistor T2. The absolute value of the gate-source voltage of the second transistor T2 |Vgs|>|Vth|>0, where Vth is the threshold voltage of the second transistor T2. At this time, the second transistor T2 is in an open state, ensuring that the abnormal voltage value of the negative voltage signal terminal V1 to be managed in a suspended state is quickly discharged through the fifth resistor R5.

[0099] After the discharge phase, if Figure 7 As shown, the gate voltage and source voltage of the first transistor T1 and the second transistor T2 are approximately equal to the voltage of the ground signal, and the gate-source voltages of the two transistors do not meet the turn-on threshold, so the first transistor T1 and the second transistor T2 are both turned off.

[0100] It should be noted that Figure 5 to Figure 7The voltage value of each node obtained by testing the current state with a voltage source is shown in FIG. This voltage value is only the voltage value obtained during the test, and this voltage value may change over time. For example: Figure 5 As shown, the first node N1 is continuously discharged through the fourth resistor R4, and the final potential may be approximately equal to the potential of the ground signal.

[0101] like Figure 8 As shown, in some embodiments, the signal terminal V to be managed includes a positive voltage signal terminal V2 to be managed, 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.

[0102] In the normal output stage, that is, the voltage of the positive voltage signal terminal V2 to be managed is the same as the working voltage of the Driver IC. In this stage, the first transistor T1 and the second transistor T2 are both in the off state, ensuring that the voltage of the positive voltage signal terminal V2 to be managed is the same as the working voltage of the Driver IC, thereby ensuring that the Driver IC is powered on normally.

[0103] In the discharge stage, the managed positive voltage signal terminal V2 is in a suspended state, at which time the first transistor T1 is in an on state, and the second transistor T2 is in an on state, ensuring that the abnormal voltage value of the managed positive voltage signal terminal V2 in the suspended state is quickly discharged through the fifth resistor R5.

[0104] After the discharge phase is over, both the first transistor T1 and the second transistor T2 are turned off.

[0105] like Fig.10 As shown, an embodiment of the present invention further provides a display module, including the voltage management circuit provided in the above embodiment; and also including a driving circuit, the driving circuit including a voltage signal input terminal Vin, the voltage signal input terminal Vin is coupled to the signal terminal V to be managed coupled to the voltage management circuit.

[0106] Exemplarily, 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.

[0107] like Fig.10 As shown, a display area AA of a display panel and a shift register GOA located in a non-display area are illustrated.

[0108] It should be noted that when the display module is applied to a display device, the display device can be: a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, or any other product or component with a display function, wherein the display device also includes a flexible circuit board MFPC, a printed circuit board, and a backplane, etc.

[0109] Since the voltage management circuit provided in the above embodiment can automatically identify whether the signal terminal V to be managed is in a suspended state, when it is not in a suspended state, it enters the normal output stage, and when it is in a suspended state, it enters the discharge stage. The voltage management circuit provided in the above embodiment can automatically manage the power-off state of the signal terminal V to be managed, thereby solving the problem that the voltage signal received by the driver integrated circuit in the display module is abnormal, which easily leads to the problem that the power-on logic and voltage of the driver integrated circuit are uncontrolled. Therefore, when the display module provided in the embodiment of the present invention includes the above voltage management circuit, it can ensure the display quality of the display module and avoid display abnormalities.

[0110] The voltage management circuit is arranged in the display module, which is not limited by the lighting device, and can avoid power-on and power-off anomalies in any lighting environment. Moreover, the voltage management circuit is arranged in the display module, and the external direct voltage supply scheme of the Driver IC can be flexibly managed, so that when the external direct voltage supply scheme is changed, there is no need to change the external device, and only the working state of the voltage management circuit in the display module can be changed accordingly.

[0111] An embodiment of the present invention further provides a driving method of a voltage management circuit, which is used to drive the voltage management circuit provided by the above embodiment; the driving method includes:

[0112] In the normal output stage, the output control subcircuit 10 controls the disconnection of the electrical connection between the signal terminal V to be managed and the ground signal input terminal under the control of the potential of the first node N1; the first node control subcircuit 20 controls the disconnection 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 to be managed; the second node control subcircuit 30 controls the conduction of the electrical connection between the second node N2 and the signal terminal V to be managed under the control of the potential of the signal terminal V to be managed;

[0113] In the discharge stage, the output control subcircuit 10 controls the electrical connection between the signal terminal V to be managed and the ground signal input terminal under the control of the potential of the first node N1; the first node control subcircuit 20 controls the electrical connection between the first node N1 and the second node N2 under the control of the potential of the signal terminal V to be managed; the second node control subcircuit 30 controls the electrical connection between the second node N2 and the signal terminal V to be managed under the control of the potential of the signal terminal V to be managed.

[0114] When the driving method provided by the embodiment of the present invention is used to drive the voltage management circuit, it can control the electrical connection between the second node N2 and the signal terminal V to be managed to be turned on, control the electrical connection between the first node N1 and the second node N2 to be disconnected, and control the electrical connection between the signal terminal V to be managed and the ground signal input terminal to be disconnected according to the potential state of the signal terminal V to be managed. In the normal output stage, the electrical connection between the second node N2 and the signal terminal V to be managed is controlled to be disconnected, the electrical connection between the first node N1 and the second node N2 is controlled to be turned on, and the electrical connection between the signal terminal V to be managed and the ground signal input terminal is controlled to be turned on, so as to achieve rapid discharge of the signal terminal V to be managed and control the potential of the signal terminal V to be managed to be at a stable ground potential.

[0115] Therefore, when the driving method provided by the embodiment of the present invention is used to drive the voltage management circuit, it can automatically identify whether the signal terminal V to be managed is in a suspended state. When it is not in a suspended state, it enters the normal output stage, and when it is in a suspended state, it enters the discharge stage. When the driving method provided by the embodiment of the present invention is used to drive the voltage management circuit, it can automatically manage the power-off state of the signal terminal V to be managed, thereby solving the problem that the voltage signal received by the driver integrated circuit in the display module is abnormal, which easily leads to uncontrolled power-on logic and voltage of the driver integrated circuit, and further causes abnormal display of the display module, resulting in production and verification losses.

[0116] In some embodiments, the driving method further includes:

[0117] After the discharge stage, the output control subcircuit 10 controls the disconnection of the electrical connection between the signal terminal V to be managed and the ground signal input terminal under the control of the potential of the first node N1; the first node control subcircuit 20 controls the disconnection 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 to be managed.

[0118] In some embodiments, the second node control subcircuit 30 includes: a voltage dividing module 301, a storage module 302 and a unidirectional conduction module 303, wherein the voltage dividing module 301 is coupled to the signal terminal V to be managed, the ground signal input terminal and the third node N3 respectively, and is used to control the potential of the third node N3; a first end of the storage module 302 is coupled to the second node N2, and a second end of the storage module 302 is coupled to the ground signal input terminal; a first end of the unidirectional conduction module 303 is coupled to the third node N3, and a second end of the unidirectional conduction module 303 is coupled to the second node N2;

[0119] In the normal output stage, the unidirectional conduction module 303 conducts the electrical connection between the third node N3 and the second node N2 under the control of the potential of the third node N3;

[0120] In the discharge phase, 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.

[0121] In some embodiments, the first node control subcircuit 20 includes a first transistor T1, a gate of the first transistor T1 is coupled to the signal terminal V to be managed, a first electrode of the first transistor T1 is coupled to the second node N2, and a second electrode of the first transistor T1 is coupled to the first node N1; the output control subcircuit 10 includes a second transistor T2, a gate of the second transistor T2 is coupled to the first node N1, a first electrode of the second transistor T2 is coupled to the signal terminal V to be managed, and a second electrode of the second transistor T2 is coupled to the ground signal input terminal;

[0122] 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;

[0123] In the discharge phase, 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 to-be-managed signal terminal V, the first transistor T1 is turned on;

[0124] After the discharge phase is finished, 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 to-be-managed signal terminal V, the first transistor T1 is turned off.

[0125] In the various method embodiments of the present invention, the serial numbers of the steps cannot be used to limit the sequence of the steps. For ordinary technicians in this field, without paying creative work, changes to the sequence of the steps are also within the protection scope of the present invention.

[0126] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment, since it is basically similar to the product embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the product embodiment.

[0127] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should be understood by people with ordinary skills in the field to which the present invention belongs. "First", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect", "couple" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0128] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0129] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0130] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A voltage management circuit, characterized in that: include: An output control subcircuit is coupled to the first node, the signal terminal to be managed and the ground signal input terminal respectively; Used to control the conduction or disconnection of 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; A first node control subcircuit is coupled to the first node, the second node and the signal terminal to be managed, respectively; and is used to control the conduction or disconnection of the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed; The second node control subcircuit is coupled to the second node, the signal terminal to be managed and the ground signal input terminal respectively; and is used to control the conduction or disconnection of 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.

2. The voltage management circuit according to claim 1, characterized in that: The second node control subcircuit comprises: A voltage dividing module, coupled to the to-be-managed signal terminal, the ground signal input terminal and the third node respectively; and used to control the potential of the third node; a storage module, wherein a first terminal of the storage module is coupled to the second node, and a second terminal of the storage module is coupled to the ground signal input terminal; A one-way conducting module, wherein a first end of the one-way conducting module is coupled to the third node, and a second end of the one-way conducting module is coupled to the second node.

3. The voltage management circuit according to claim 2, characterized in that: The voltage divider module includes a first resistor and a second resistor, wherein a first end of the first resistor is coupled to the signal end to be managed, and a second end of the first resistor is coupled to the third node; a first end of the second resistor is coupled to the third node, and a second end of the second resistor is coupled to the ground signal input end; The storage module comprises a storage capacitor, a first end of the storage capacitor is coupled to the second node, and a second end of the storage capacitor is coupled to the ground signal input terminal; The unidirectional conduction module includes a diode, a first electrode of the diode is coupled to the third node, and a second electrode of the diode is coupled to the second node.

4. The voltage management circuit according to claim 3, characterized in that: The first node control subcircuit includes a first transistor, a gate of the first transistor is coupled to the signal terminal to be managed, a first electrode of the first transistor is coupled to the second node, and a second electrode of the first transistor is coupled to the first node.

5. The voltage management circuit according to claim 4, characterized in that: The output control subcircuit includes a second transistor, a gate of the second transistor is coupled to the first node, a first electrode of the second transistor is coupled to the signal terminal to be managed, and a second electrode of the second transistor is coupled to the ground signal input terminal.

6. The voltage management circuit according to claim 5, characterized in that: The signal terminal to be managed includes a negative voltage signal terminal to be managed, the first transistor includes an N-type transistor, the second transistor includes a P-type transistor, the first electrode of the diode includes a cathode, and the second electrode of the diode includes an anode.

7. The voltage management circuit according to claim 5, characterized in that: The signal terminal to be managed includes a positive voltage signal terminal to be managed, the first transistor includes a P-type transistor, the second transistor includes an N-type transistor, the first electrode of the diode includes an anode, and the second electrode of the diode includes a cathode.

8. The voltage management circuit according to any one of claims 1 to 7, characterized in that: The voltage management circuit further includes: a load subcircuit, wherein the first node control subcircuit is coupled to the signal terminal to be managed through the load subcircuit; and / or, a first discharge subcircuit, wherein a first terminal of the first discharge subcircuit is coupled to the first node, and a second terminal of the first discharge subcircuit is coupled to the ground signal input terminal; and / or, A second discharge subcircuit, wherein the output control subcircuit is coupled to the signal terminal to be managed through the second discharge subcircuit.

9. The voltage management circuit according to claim 8, characterized in that: The load subcircuit comprises a third resistor, a first end of the third resistor is coupled to the to-be-managed signal end, and a second end of the third resistor is coupled to the first node control subcircuit; The first discharge subcircuit comprises a fourth resistor, a first end of the fourth resistor is coupled to the first node, and a second end of the fourth resistor is coupled to the ground signal input terminal; The second discharge subcircuit includes a fifth resistor, a first end of the fifth resistor is coupled to the to-be-managed signal end, and a second end of the fifth resistor is coupled to the output control subcircuit.

10. A display module, characterized in that: It comprises the voltage management circuit as claimed in any one of claims 1 to 9; and further comprises a driving circuit, wherein the driving circuit comprises a voltage signal input terminal, and the voltage signal input terminal is coupled to a signal terminal to be managed of the voltage management circuit.

11. The display module according to claim 10, characterized in that: The display module includes a display panel and a flexible circuit board, and the flexible circuit board is bound to a non-display area of ​​the display panel; The driving circuit is located in a non-display area 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, characterized in that: Used to drive the voltage management circuit according to any one of claims 1 to 9; the driving method comprises: In the normal output stage, the output control subcircuit controls the disconnection of 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 subcircuit controls the disconnection of the electrical connection between the first node and the second node under the control of the potential of the signal terminal to be managed; the second node control subcircuit controls the conduction of 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 the discharge stage, the output control subcircuit controls 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 subcircuit controls 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 subcircuit controls 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, characterized in that: The driving method further includes: After the discharge stage, the output control subcircuit controls the disconnection of 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 subcircuit controls the disconnection of 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, characterized in that: The second node control subcircuit comprises: a voltage dividing module, a storage module and a unidirectional conduction module, wherein the voltage dividing module is coupled to the signal terminal to be managed, the ground signal input terminal and the third node respectively, and is used to control the potential of the third node; a first terminal of the storage module is coupled to the second node, and a second terminal of the storage module is coupled to the ground signal input terminal; a first terminal of the unidirectional conduction module is coupled to the third node, and a second terminal of the unidirectional conduction module is coupled to the second node; In the normal output stage, the unidirectional conduction module conducts the electrical connection between the third node and the second node under the control of the potential of the third node; In the discharge phase, the unidirectional conduction module disconnects the electrical connection between the third node and the second node under the control of the potential of the third node.

15. The driving method of the voltage management circuit according to claim 13, characterized in that: The first node control subcircuit comprises a first transistor, a gate of the first transistor is coupled to the signal terminal to be managed, a first electrode of the first transistor is coupled to the second node, and a second electrode of the first transistor is coupled to the first node; The output control subcircuit comprises a second transistor, a gate of the second transistor is coupled to the first node, a first electrode of the second transistor is coupled to the to-be-managed signal terminal, and a second electrode of the second transistor is coupled to the ground signal input terminal; In the normal output stage, under the control of the potential of the first node, the second transistor is turned off; Under the control of the potential of the signal terminal to be managed, the first transistor is turned off; In the discharge phase, under the control of the potential of the first node, the second transistor is turned on; Under the control of the potential of the signal terminal to be managed, the first transistor is turned on; After the discharge phase is finished, under the control of the potential of the first node, the second transistor is turned off; Under the control of the potential of the signal terminal to be managed, the first transistor is turned off.

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