Voltage management circuit and its driving method, display module

Abstract

The application provides a voltage management circuit, a driving method thereof and a display module, and relates to the technical field of display. In the voltage management circuit, the output control sub-circuit is coupled with the first node, the signal to be managed and the ground signal input end, and is used for controlling the electrical connection between the signal to be managed and the ground signal input end; the first node control sub-circuit is coupled with the first node, the second node and the signal to be managed, and is used for controlling the electrical connection between the first node and the second node; and the second node control sub-circuit is coupled with the second node, the signal to be managed and the ground signal input end, and is used for controlling the electrical connection between the second node and the signal to be managed.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a voltage management circuit and its driving method, and a display module. Background Technology

[0002] In the process of manufacturing and using Organic Light-Emitting Diode (OLED) display modules, the lighting equipment uses the power supply of the lighting machine or the boost converter circuit of the power IC as an external direct voltage source. This external direct voltage source outputs the required operating voltage to the driver IC in the OLED display module. However, almost all lighting machine power supplies and some power ICs lack the function of managing the output voltage status after power-off. This makes it easy for the voltage output terminal of the external direct voltage source to be in a floating state after power-off, resulting in abnormal potential at the voltage output terminal. This abnormality is particularly serious when the voltage output terminal is used to provide a negative operating voltage. When the lighting equipment performs secondary lighting, the power-on logic and voltage of the driver IC may become uncontrolled. The abnormal power-on of the driver IC will further cause display abnormalities in the OLED display module, resulting in production and verification losses. Summary of the Invention

[0003] The purpose of this invention is to provide a voltage management circuit and its driving method, as well as a display module, to solve problems such as abnormal voltage signals received by the driving integrated circuit in the display module, which can easily lead to uncontrolled power-on logic and voltage of the driving integrated circuit, further causing display abnormalities in the display module, resulting in production and verification losses.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

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

[0006] An output control sub-circuit is coupled to the first node, the signal terminal to be managed, and the ground signal input terminal, respectively; it is used to control the electrical connection between the signal terminal to be managed and the ground signal input terminal to be turned on or off under the control of the potential of the first node.

[0007] The first node control sub-circuit is coupled to the first node, the second node, and the signal terminal to be managed, respectively; it is used to control the electrical connection between the first node and the second node to be turned on or off under the control of the potential of the signal terminal to be managed.

[0008] The second node control sub-circuit is coupled to the second node, the managed signal terminal, and the ground signal input terminal, respectively; it is used to control the electrical connection between the second node and the managed signal terminal to be turned on or off under the control of the potential of the managed signal terminal.

[0009] Optionally, the second node control sub-circuit includes:

[0010] The voltage divider module is coupled to the signal terminal to be managed, the ground signal input terminal, and the third node respectively; it is used to control the potential of the third node.

[0011] A storage module, wherein 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;

[0012] A unidirectional conduction module, wherein the first end of the unidirectional conduction module is coupled to the third node, and the second end of the unidirectional conduction module is coupled to the second node.

[0013] Optionally, the voltage divider module includes a first resistor and a second resistor. A first end of the first resistor is coupled to the signal terminal 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 terminal.

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

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

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

[0017] Optionally, the output control sub-circuit includes a second transistor, the gate of which is coupled to the first node, the first terminal of which is coupled to the signal terminal to be managed, and the second terminal of which 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] The load sub-circuit, wherein the first node control sub-circuit is coupled to the signal terminal to be managed via the load sub-circuit; and / or,

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

[0023] The second discharge circuit is used to couple the output control sub-circuit to the signal terminal to be managed.

[0024] Optionally, the load sub-circuit includes a third resistor, the first end of which is coupled to the signal terminal to be managed, and the second end of which is coupled to the first node control sub-circuit.

[0025] The first discharge circuit includes a fourth resistor, the first end of which is coupled to the first node, and the second end of which is coupled to the ground signal input terminal.

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

[0027] Based on the above-described voltage management circuit, a second aspect of the present invention provides a display module including the voltage management circuit described above; it also includes a driving circuit, wherein the driving circuit includes 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, wherein the flexible circuit board is bonded to a non-display area of ​​the display panel;

[0029] 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.

[0030] Based on the above-described voltage management circuit technical solution, a third aspect of the present invention provides a driving method for a voltage management circuit, used to drive the voltage management circuit; the driving method includes:

[0031] During the normal output phase, the output control sub-circuit, under the control of the potential of the first node, controls to disconnect the electrical connection between the managed signal terminal and the ground signal input terminal; the first node control sub-circuit, under the control of the potential of the managed signal terminal, controls to disconnect the electrical connection between the first node and the second node; the second node control sub-circuit, under the control of the potential of the managed signal terminal, controls to connect the electrical connection between the second node and the managed signal terminal.

[0032] During the discharge phase, the output control sub-circuit, under the control of the potential of the first node, controls the electrical connection between the managed signal terminal and the ground signal input terminal to be turned on; the first node control sub-circuit, under the control of the potential of the managed signal terminal, controls the electrical connection between the first node and the second node to be turned on; the second node control sub-circuit, under the control of the potential of the managed signal terminal, controls the electrical connection between the second node and the managed signal terminal to be turned off.

[0033] Optionally, the driving method further includes:

[0034] After the discharge phase ends, the output control sub-circuit, under the control of the potential of the first node, controls the disconnection of the electrical connection between the managed signal terminal and the ground signal input terminal; the first node control sub-circuit, under the control of the potential of the managed signal terminal, controls the disconnection of the electrical connection between the first node and the second node.

[0035] Optionally, the second node control sub-circuit includes: a voltage divider module, a storage module, and a unidirectional conduction module. The voltage divider 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. The first terminal of the storage module is coupled to the second node, and the second terminal of the storage module is coupled to the ground signal input terminal. The first terminal of the unidirectional conduction module is coupled to the third node, and the second terminal of the unidirectional conduction module is coupled to the second node.

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

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

[0038] Optionally, the first node control sub-circuit includes a first transistor, the gate of which is coupled to the managed signal terminal, the first electrode of which is coupled to the second node, and the second electrode of which is coupled to the first node; the output control sub-circuit includes a second transistor, the gate of which is coupled to the first node, the first electrode of which is coupled to the managed signal terminal, and the second electrode of which is coupled to the ground signal input terminal.

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

[0040] During the discharge phase, 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.

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

[0042] In the technical solution provided by this invention, the second node control sub-circuit is controlled by the potential of the managed signal terminal, and can control the connection between the second node and the managed signal terminal to be turned on or off, thereby controlling the potential of the second node; the first node control sub-circuit is controlled by the potential of the managed signal terminal, and can control the connection between the first node and the second node to be turned on or off, thereby controlling the potential of the first node; the output control sub-circuit is controlled by the potential of the first node, and can control the connection between the managed signal terminal and the ground signal input terminal to be turned on or off, thereby controlling the potential of the managed signal terminal.

[0043] The technical solution provided by this invention can, according to the potential state of the managed signal terminal, control the electrical connection between the second node and the managed signal terminal to be turned on during the normal output phase, control the electrical connection between the first node and the second node to be turned off, and control the electrical connection between the managed signal terminal and the ground signal input terminal to be turned off, thereby maintaining the potential of the managed signal terminal at its current state and meeting normal operation requirements; during the discharge phase, control the electrical connection between the second node and the managed signal terminal to be turned off, control the electrical connection between the first node and the second node to be turned on, and control the electrical connection between the managed signal terminal and the ground signal input terminal to be turned on, thereby realizing rapid discharge of the managed signal terminal and controlling the potential of the managed signal terminal at a stable ground potential.

[0044] Therefore, the technical solution provided by this invention can automatically identify whether the signal terminal to be managed is in a floating state. When it is not in a floating state, it enters the normal output stage; when it is in a floating state, it enters the discharge stage. The technical solution provided by this invention can automatically manage the power-down state of the signal terminal to be managed, thereby solving the problems such as abnormal voltage signals received by the driver integrated circuit in the display module, which can easily lead to uncontrolled power-on logic and voltage of the driver integrated circuit, and further cause display abnormalities in the display module, resulting in production and verification losses.

[0045] The technical solution provided by this invention enables the display module to be powered on and off according to the timing voltage requirements of the Driver IC under different lighting devices and methods. This ensures that the optimal power-on and power-off method can be obtained under different external direct voltage source solutions for the Driver IC and under different lighting device conditions, thereby improving the display effect of the external direct voltage supply to the display module. Attached Figure Description

[0046] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

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

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

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

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

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

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

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

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

[0055] Figure 9 The signal waveform diagrams of the managed signal terminal provided in the embodiments of the present invention when connected to the voltage management circuit and when not connected to the voltage management circuit;

[0056] Figure 10 This is a schematic diagram of a display module connected to a lighting device according to an embodiment of the present invention. Detailed Implementation

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

[0058] Research has revealed that after the power supply to the lighting equipment is turned off, the voltage output terminal of the external direct voltage source is prone to being in a floating state, leading to an abnormal potential at this output terminal. The duration and state of this abnormality are unpredictable. This anomaly is particularly severe when this voltage output terminal is used to provide a negative operating voltage, especially when a capacitor is used as the voltage output terminal, or when parasitic capacitance exists in the power supply circuit. During secondary lighting operations, the driver IC's power-on logic and voltage become uncontrolled. This abnormal driver IC power-on further causes display abnormalities in the OLED display module, resulting in production and verification losses.

[0059] To avoid the aforementioned losses, the current solutions are to manually short-circuit the lighting equipment to ground after the power supply is turned off, modify the equipment, or purchase a Power IC with power-off management functionality. However, lighting equipment involves many types and a large quantity from the production end to the end user. Identifying the equipment and manually discharging it quickly consumes a lot of human resources, and modifying the equipment is costly and time-consuming. Furthermore, the selection range of Power ICs is limited. Therefore, there is an urgent need for an improved method that automatically and quickly discharges when powered by an external direct voltage supply, making the external direct voltage supply solution highly correlated with the OLED display module solution, and allowing for flexible solution changes.

[0060] Please see Figure 1 This invention provides a voltage management circuit, comprising:

[0061] The output control sub-circuit 10 is coupled to the first node N1, the managed signal terminal V, and the ground signal input terminal, respectively; it is used to control the electrical connection between the managed signal terminal V and the ground signal input terminal to be turned on or off under the control of the potential of the first node N1.

[0062] The first node control sub-circuit 20 is coupled to the first node N1, the second node N2 and the signal terminal V to be managed, respectively; it is used to control the electrical connection between the first node N1 and the second node N2 to be turned on or off under the control of the potential of the signal terminal V to be managed.

[0063] The second node control sub-circuit 30 is coupled to the second node N2, the managed signal terminal V, and the ground signal input terminal, respectively; it is used to control the electrical connection between the second node N2 and the managed signal terminal V to be turned on or off under the control of the potential of the managed signal terminal V.

[0064] For example, when the voltage management circuit is applied to a display module, the managed signal terminal V is coupled to the voltage signal input terminal Vin included in the driving circuit of the display module. The voltage signal input terminal Vin included in the driving circuit is used to receive its required operating voltage.

[0065] For example, when the display module is used in conjunction with a lighting device, the voltage signal input terminal Vin of the driving circuit is coupled to the voltage output terminal Vout of the external direct-supply voltage source in the lighting device, for receiving the operating voltage output from the external direct-supply voltage source's voltage output terminal Vout. The managed signal terminal V of 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 capacitor output voltage type or the type of parasitic capacitance in the power output circuit. The external direct-supply voltage of the lighting device is not restricted and can be flexibly increased or decreased, as long as the solution structure matches the external direct-supply voltage management circuit.

[0066] For example, the ground signal input terminal is used to input a ground signal, the voltage value of which is 0V.

[0067] The specific driving methods for voltage management circuits include:

[0068] During the normal output phase, i.e., 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 powers on according to this operating voltage, the potential of the managed signal terminal V coupled to the voltage management circuit is the same as the operating voltage during this phase; during this phase, the second node control sub-circuit 30, under the control of the potential of the managed signal terminal V, controls the conduction of the electrical connection between the second node N2 and the managed signal terminal V; the first node control sub-circuit 20, under the control of the potential of the managed signal terminal V, controls the disconnection of the electrical connection between the first node N1 and the second node N2; the output control sub-circuit 10, under the control of the potential of the first node N1, controls the disconnection of the electrical connection between the managed signal terminal V and the ground signal input terminal, thereby maintaining the potential of the managed signal terminal V in the current state and meeting the normal operation requirements.

[0069] During the discharge phase, i.e., when the external direct voltage source in the lighting device is powered down and the Driver IC is powered down, the second node control sub-circuit 30, under the control of the potential of the managed signal terminal V, controls the disconnection of the electrical connection between the second node N2 and the managed signal terminal V; the first node control sub-circuit 20, under the control of the potential of the managed signal terminal V, controls the connection of the electrical connection between the first node N1 and the second node N2; the output control sub-circuit 10, under the control of the potential of the first node N1, controls the connection of the electrical connection between the managed signal terminal V and the ground signal input terminal, thereby discharging the managed signal terminal V.

[0070] like Figure 9 The diagram illustrates the signal waveforms of the external direct voltage source in the lighting device when the managed signal terminal V is powered on, with and without the voltage management circuit connected. Figure 9 The solid line in the diagram represents the signal waveform of the signal terminal V to be managed when the external direct voltage source in the lighting device is powered down without the voltage management circuit being connected. It can be seen that the signal is in an abnormal state. Figure 9 The dashed line in the diagram represents the signal waveform of the managed signal terminal V after discharge when the external direct voltage source in the lighting device is powered down, with the voltage management circuit connected. It can be seen that the signal has the same potential as the ground signal.

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

[0072] In the voltage management circuit provided in this embodiment of the invention, based on the potential state of the managed signal terminal V, during the normal output phase, the circuit controls the electrical connection between the second node N2 and the managed signal terminal V to be turned on, the electrical connection between the first node N1 and the second node N2 to be turned off, and the electrical connection between the managed signal terminal V and the ground signal input terminal to be turned off, thereby maintaining the potential of the managed signal terminal V in its current state and meeting normal operation requirements; during the discharge phase, the circuit controls the electrical connection between the second node N2 and the managed signal terminal V to be turned off, the electrical connection between the first node N1 and the second node N2 to be turned on, and the electrical connection between the managed signal terminal V and the ground signal input terminal to be turned on, thereby achieving rapid discharge of the managed signal terminal V and controlling the potential of the managed signal terminal V at a stable ground potential.

[0073] Therefore, the voltage management circuit provided in this embodiment of the invention can automatically identify whether the managed signal terminal V is in a floating state. When it is not in a floating state, it enters the normal output stage; when it is in a floating state, it automatically enters the discharge stage, achieving rapid discharge. The voltage management circuit provided in this embodiment of the invention can automatically manage the power-down state of the managed signal terminal V, thereby solving the problems of abnormal voltage signals received by the driver integrated circuit in the display module, which can easily lead to uncontrolled power-on logic and voltage of the driver integrated circuit, and further cause display abnormalities in the display module, resulting in production and verification losses.

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

[0075] Furthermore, the voltage management circuit provided in this embodiment of the invention does not require the introduction of additional control signals, and the overall power consumption is controllable.

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

[0077] Voltage divider module 301 is coupled to the managed signal terminal V, the ground signal input terminal and the third node N3 respectively; used to control the potential of the third node N3;

[0078] Storage module 302, the first end of which is coupled to the second node N2, and the second end of which is coupled to the ground signal input terminal;

[0079] A one-way conduction module 303, wherein the first end of the one-way conduction module 303 is coupled to the third node N3, and the second end of the one-way conduction module 303 is 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. The first end of the first resistor R1 is coupled to the managed signal terminal V, 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 terminal. For example, the resistance value of the first resistor R1 is between 1.5KΩ and 2.5KΩ, and can specifically take values ​​such as 1.5KΩ, 1.7KΩ, 1.9KΩ, 2.0KΩ, 2.2KΩ, 2.4KΩ, 2.5KΩ, etc., but is not limited to these. For example, the resistance value of the second resistor R2 is between 30KΩ and 36KΩ, and can specifically take values ​​such as 30KΩ, 31KΩ, 32KΩ, 33KΩ, 34KΩ, 35KΩ, 36KΩ, etc., but is not limited to these.

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

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

[0083] The second node control sub-circuit 30 is configured as described above, including a voltage divider module 301, a storage module 302, and a unidirectional conduction module 303. The voltage divider module 301 can control the potential of the third node N3, and the unidirectional conduction module 303 can turn on or off according to the potential of the third node N3, thereby controlling 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, maintaining the potential of the third node N3.

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

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

[0086] For example, in the first and second terminals of each of the above transistors, one is the source and the other is the drain.

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

[0088] Load sub-circuit 40, the first node control sub-circuit 20 is coupled to the managed signal terminal V through the load sub-circuit 40; and / or,

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

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

[0091] like Figure 4 and Figure 8As shown, exemplarily, the load sub-circuit 40 includes a third resistor R3. The first end of the third resistor R3 is coupled to the managed signal terminal V, and the second end of the third resistor R3 is coupled to the first node control sub-circuit 20. For example, the resistance value of the third resistor R3 is between 30KΩ and 36KΩ, and can specifically be 30KΩ, 31KΩ, 32KΩ, 33KΩ, 34KΩ, 35KΩ, 36KΩ, etc., but is not limited to these.

[0092] like Figure 4 and Figure 8 As shown, exemplarily, the first discharge circuit 50 includes a fourth resistor R4. The first end of the fourth resistor R4 is coupled to the first node N1, and the second end of the fourth resistor R4 is coupled to the ground signal input terminal. For example, the resistance value of the fourth resistor R4 is between 18KΩ and 22KΩ, and can specifically take values ​​of 18KΩ, 19KΩ, 20KΩ, 21KΩ, 22KΩ, etc., but is not limited to these.

[0093] like Figure 4 and Figure 8 As shown, exemplarily, the second discharge circuit 60 includes a fifth resistor R5. The first end of the fifth resistor R5 is coupled to the signal terminal V to be managed, and the second end of the fifth resistor R5 is coupled to the output control sub-circuit 10. For example, the resistance value of the fifth resistor R5 is between 18KΩ and 22KΩ, and can specifically take values ​​of 18KΩ, 19KΩ, 20KΩ, 21KΩ, 22KΩ, etc., but is not limited to these.

[0094] The voltage management circuit described above also includes a load sub-circuit 40, a first discharge circuit 50, and / or a second discharge circuit 60. The load sub-circuit 40 and the second discharge circuit 60 serve to limit current, and the first discharge circuit 50 can limit the discharge rate of node N1 to prevent node N1 from discharging too quickly.

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

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

[0097] During the normal output phase, that is, when the voltage at the negative voltage signal terminal V1 to be managed is the same as the operating voltage of the Driver IC, such as... Figure 5As shown, taking the voltage of the negative voltage signal terminal V1 to be managed as -10V as an example, in this stage, the voltage of the negative voltage signal terminal V1 to be managed is written to the first terminal of the storage capacitor C1 through the first resistor R1 and the diode D. Due to the voltage drop of the first resistor R1 and the diode D, the absolute value of the voltage written to the first terminal (e.g., the source) of the first transistor T1 is less than the absolute value of the voltage written to 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 due to the action of the fourth resistor R4. The voltage of the first terminal (e.g., the 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 operating voltage of the Driver IC, ensuring that the Driver IC is powered on normally.

[0098] During the discharge phase, such as Figure 6 As shown, the negative voltage signal terminal V1 to be managed is in a floating state. The absolute value of the voltage of the negative voltage signal terminal V1 to be managed gradually decreases (shown as -5V). Due to the action of diode D, the voltage of the negative voltage signal terminal V1 to be managed cannot pass through diode D. The voltage of the first terminal (e.g., the 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 terminal voltage of the first transistor T1. At this time, the gate-source voltage Vgs of the first transistor T1 > Vth > 0. Vth is the threshold voltage of the first transistor T1. At this time, the first transistor T1 is in the open state, ensuring accurate identification that the negative voltage signal terminal V1 to be managed is in a floating state. The voltage of the first node N1 is approximately equal to the voltage of the first terminal of the first transistor T1. The storage capacitor C1 continues to discharge to maintain the voltage of the first node N1. The voltage of the first node N1 is less than the voltage of the first terminal (e.g., the source) of the second transistor T2. The absolute value of the gate-source voltage of the second transistor T2, |Vgs|>|Vth|>0, is Vth, which is the threshold voltage of the second transistor T2. At this time, the second transistor T2 is in the open state, ensuring that the abnormal voltage value of the floating negative voltage signal terminal V1 is quickly discharged through the fifth resistor R5.

[0099] After the discharge phase ends, such as Figure 7 As shown, the gate voltage and source voltage of the first transistor T1 and the second transistor T2 are both approximately equal to the voltage of the ground signal. The gate-source voltages of both 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, Figures 5-7The diagram illustrates the voltage values ​​obtained at each node under the current state using a voltage source test. These voltage values ​​are only obtained at the time of the test and may change over time. For example: Figure 5 As shown, the first node N1, after continuous discharge through the fourth resistor R4, may eventually have a potential approximately equal to the ground signal potential.

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

[0102] During the normal output phase, when the voltage of the positive voltage signal terminal V2 to be managed is the same as the operating voltage of the Driver IC, both the first transistor T1 and the second transistor T2 are in the off state to ensure that the voltage of the positive voltage signal terminal V2 to be managed is the same as the operating voltage of the Driver IC, thus ensuring that the Driver IC is powered on normally.

[0103] During the discharge phase, the managed positive voltage signal terminal V2 is in a floating state. At this time, the first transistor T1 is in the open state and the second transistor T2 is in the open state, ensuring that the abnormal voltage value of the managed positive voltage signal terminal V2 in the floating state is discharged quickly through the fifth resistor R5.

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

[0105] like Figure 10 As shown, this embodiment of the invention also provides a display module, including the voltage management circuit provided in the above embodiment; it also includes a driving circuit, the driving circuit including a voltage signal input terminal Vin, the voltage signal input terminal Vin being coupled to the managed signal terminal V coupled to the voltage management circuit.

[0106] For example, the display module includes a display panel and a flexible circuit board (MFPC), the MFPC being bonded 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 MFPC.

[0107] like Figure 10 The diagram illustrates the display area AA of the display panel and the shift register GOA located in the non-display area.

[0108] It should be noted that when the display module is applied in a display device, the display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer. The display device also includes flexible printed circuit boards (MFPC), printed circuit boards, and backplanes.

[0109] Because the voltage management circuit provided in the above embodiments can automatically identify whether the managed signal terminal V is in a floating state, it enters the normal output stage when it is not in a floating state, and enters the discharge stage when it is in a floating state. The voltage management circuit provided in the above embodiments can automatically manage the power-down state of the managed signal terminal V, thereby solving the problem that abnormal voltage signals received by the driver integrated circuit in the display module can easily lead to uncontrolled power-on logic and voltage of the driver integrated circuit. Therefore, when the display module provided in this embodiment includes the above-mentioned voltage management circuit, it can ensure the display quality of the display module and avoid display abnormalities.

[0110] By incorporating the voltage management circuit within the display module, it is not limited by the lighting equipment and can avoid power-on and power-off anomalies in any lighting environment. Furthermore, by placing the voltage management circuit within the display module, flexible management of the external direct voltage source solution for the Driver IC can be achieved. This means that when the external direct voltage source solution changes, there is no need to modify the external equipment; only the operating state of the voltage management circuit within the display module needs to change accordingly.

[0111] This invention also provides a driving method for a voltage management circuit, used to drive the voltage management circuit provided in the above embodiments; the driving method includes:

[0112] During the normal output phase, the output control sub-circuit 10, under the control of the potential of the first node N1, controls to disconnect the electrical connection between the managed signal terminal V and the ground signal input terminal; the first node control sub-circuit 20, under the control of the potential of the managed signal terminal V, controls to disconnect the electrical connection between the first node N1 and the second node N2; the second node control sub-circuit 30, under the control of the potential of the managed signal terminal V, controls to connect the electrical connection between the second node N2 and the managed signal terminal V.

[0113] During the discharge phase, the output control sub-circuit 10, under the control of the potential of the first node N1, controls the electrical connection between the managed signal terminal V and the ground signal input terminal; the first node control sub-circuit 20, under the control of the potential of the managed signal terminal V, controls the electrical connection between the first node N1 and the second node N2; the second node control sub-circuit 30, under the control of the potential of the managed signal terminal V, controls the electrical connection between the second node N2 and the managed signal terminal V.

[0114] When driving the voltage management circuit using the driving method provided in this embodiment of the invention, it can control the electrical connection between the second node N2 and the managed signal terminal V to be turned on during the normal output phase, 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 managed signal terminal V and the ground signal input terminal to be turned off, thereby maintaining the potential of the managed signal terminal V in the current state and meeting the normal operation requirements, based on the potential state of the managed signal terminal V. During the discharge phase, it controls the electrical connection between the second node N2 and the managed signal terminal V to be turned off, controls the electrical connection between the first node N1 and the second node N2 to be turned on, and controls the electrical connection between the managed signal terminal V and the ground signal input terminal to be turned on, thereby realizing the rapid discharge of the managed signal terminal V and controlling the potential of the managed signal terminal V to be controlled at a stable ground potential.

[0115] Therefore, when driving the voltage management circuit using the driving method provided in this embodiment of the invention, it can automatically identify whether the managed signal terminal V is in a floating state. When it is not in a floating state, it enters the normal output stage; when it is in a floating state, it enters the discharge stage. When driving the voltage management circuit using the driving method provided in this embodiment of the invention, it can automatically manage the power-down state of the managed signal terminal V, thereby solving problems such as abnormal voltage signals received by the driving integrated circuit in the display module, which can easily lead to uncontrolled power-on logic and voltage of the driving integrated circuit, and further cause display abnormalities in the display module, resulting in production and verification losses.

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

[0117] After the discharge phase ends, the output control sub-circuit 10, under the control of the potential of the first node N1, controls the disconnection of the electrical connection between the managed signal terminal V and the ground signal input terminal; the first node control sub-circuit 20, under the control of the potential of the managed signal terminal V, controls the disconnection of the electrical connection between the first node N1 and the second node N2.

[0118] In some embodiments, the second node control sub-circuit 30 includes: a voltage divider module 301, a storage module 302, and a unidirectional conduction module 303. The voltage divider module 301 is coupled to the 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. The first terminal of the storage module 302 is coupled to the second node N2, and the second terminal of the storage module 302 is coupled to the ground signal input terminal. The first terminal of the unidirectional conduction module 303 is coupled to the third node N3, and the second terminal of the unidirectional conduction module 303 is coupled to the second node N2.

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

[0120] During the discharge phase, the unidirectional conduction module 303, under the control of the potential of the third node N3, disconnects the electrical connection between the third node N3 and the second node N2.

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

[0122] During the normal output phase, the second transistor T2 is turned off under the control of the potential of the first node N1; the first transistor T1 is turned off under the control of the potential of the managed signal terminal V.

[0123] During the discharge phase, the second transistor T2 is turned on under the control of the potential of the first node N1; the first transistor T1 is turned on under the control of the potential of the managed signal terminal V.

[0124] After the discharge phase ends, the second transistor T2 is turned off under the control of the potential of the first node N1; the first transistor T1 is turned off under the control of the potential of the managed signal terminal V.

[0125] In the various method embodiments of the present invention, the sequence numbers of each step are not intended to limit the order of the steps. For those skilled in the art, any changes in the order of the steps without creative effort are also within the scope of protection of the present invention.

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

[0127] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connection,” “coupled,” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0128] It is understandable that when a component such as a layer, film, region, or substrate is referred to as being "above" or "below" another component, the component may be "directly" located "above" or "below" the other component, or there may be intermediate components present.

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

[0130] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A voltage management circuit, comprising: The voltage management circuit comprises: an output control sub-circuit coupled with the first node, the to-be-managed signal terminal and the ground signal input terminal respectively; a first node control sub-circuit coupled with the first node, the second node and the to-be-managed signal terminal respectively; and a second node control sub-circuit coupled with the second node, the to-be-managed signal terminal and the ground signal input terminal respectively. The second node control sub-circuit comprises: a voltage division module coupled with the to-be-managed signal terminal, the ground signal input terminal and a third node respectively; and a storage module having a first end coupled with the second node and a second end coupled with the ground signal input terminal. The voltage management circuit further comprises: a unidirectional conduction module having a first end coupled with the third node and a second end coupled with the second node.

2. The voltage management circuit according to claim 1, wherein the voltage division module comprises a first resistor and a second resistor, the first resistor having a first end coupled with the to-be-managed signal terminal and a second end coupled with the third node, and the second resistor having a first end coupled with the third node and a second end coupled with the ground signal input terminal; the storage module comprises a storage capacitor having a first end coupled with the second node and a second end coupled with the ground signal input terminal; and the unidirectional conduction module comprises a diode having a first pole coupled with the third node and a second pole coupled with the second node.

3. The voltage management circuit of claim 2, wherein, The first node control sub-circuit comprises a first transistor having a gate coupled with the to-be-managed signal terminal, a first pole coupled with the second node and a second pole coupled with the first node.

4. The voltage management circuit of claim 3, wherein, The output control sub-circuit comprises a second transistor having a gate coupled with the first node, a first pole coupled with the to-be-managed signal terminal and a second pole coupled with the ground signal input terminal.

5. The voltage management circuit of claim 4, wherein, 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 pole of the diode comprises a cathode and the second pole of the diode comprises an anode.

6. The voltage management circuit of claim 4, wherein, 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 pole of the diode comprises an anode and the second pole of the diode comprises a cathode.

7. The voltage management circuit of any one of claims 1-6, wherein, The voltage management circuit further comprises: a load sub-circuit, the first node control sub-circuit being coupled with 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 with the first node, and a second end of the first discharging sub-circuit being coupled with the ground signal input terminal; and / or a second discharging sub-circuit, the output control sub-circuit being coupled with the signal terminal to be managed through the second discharging sub-circuit.

8. The voltage management circuit according to claim 7, wherein the load sub-circuit comprises a third resistor, a first end of the third resistor being coupled with the signal terminal to be managed, and a second end of the third resistor being coupled with the first node control sub-circuit; the first discharging sub-circuit comprises a fourth resistor, a first end of the fourth resistor being coupled with the first node, and a second end of the fourth resistor being coupled with the ground signal input terminal; the second discharging sub-circuit comprises a fifth resistor, a first end of the fifth resistor being coupled with the signal terminal to be managed, and a second end of the fifth resistor being coupled with the output control sub-circuit.

9. A display module, characterized by 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.

10. The display module of claim 9, wherein, 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. The driving method for driving the voltage management circuit according to any one of claims 1-8, wherein the driving method comprises:

11. A driving method of a voltage management circuit, characterized by, 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. The driving method further comprises:

12. The driving method of the voltage management circuit according to claim 11, wherein 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. ​ 13. The driving method of the voltage management circuit according to claim 11, 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.

14. The driving method of the voltage management circuit according to claim 12, 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.

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