Power supply module, display panel and display device

Abstract

The invention relates to a power module, a display panel and a display device. The power supply module comprises a common potential end, a pull current end, a sink current end and an auxiliary end, the auxiliary end is connected with a target potential end, and the target potential end is the common potential end or the pull current end; wherein the common potential end is used for accessing a reference potential of a to-be-driven circuit, the pull current end is used for being connected with a first pole of the to-be-driven circuit, the sink current end is used for being connected with a second pole of the to-be-driven circuit, a first potential of the pull current end and a second potential of the sink current end are both greater than a potential of the common potential end, and the first potential is greater than the second potential. The current loop sequentially flows through the pull current end, the first pole of the to-be-driven circuit, the second pole of the to-be-driven circuit and the sink current end; therefore, reliable cut-off of the transistor in the pixel circuit is achieved, the technical problem that the display device is in a black state and is not black is solved, and the display effect of the display device is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a power supply module, a display panel and a display device. Background Art

[0002] An active matrix organic light emitting diode (AMOLED) display device is a self-luminous display device, which generally includes an array substrate and a plurality of light emitting devices located on the array substrate, wherein the array substrate includes a plurality of pixel circuits, the pixel circuits are composed of components such as transistors and capacitors, and the pixel circuits are used to drive the light emitting devices.

[0003] At present, in the related art, the power supply voltage ELVDD provided by the power supply module in the display device to the pixel circuit is a positive value, and the voltage ELVSS provided to the cathode of the light-emitting device is a negative value. In the case where the pixel circuit is an oxide type circuit, there is a phenomenon that the display of the display device appears black but not black because the transistor in the pixel circuit cannot be reliably cut off, which greatly reduces the display effect of the display device. Summary of the invention

[0004] In view of the above technical problems, it is necessary to provide a power supply module, a display panel and a display device that can ensure that the transistors in the pixel circuit are reliably cut off, thereby improving the display effect of the display device.

[0005] In a first aspect, a power supply module is provided, the power supply module comprising a common potential terminal, a current sourcing terminal, a current sinking terminal and an auxiliary terminal, wherein the auxiliary terminal is connected to a target potential terminal, and the target potential terminal is the common potential terminal or the current sourcing terminal;

[0006] Among them, the common potential terminal is used to connect to the reference potential of the circuit to be driven, the current pulling terminal is used to connect to the first pole of the circuit to be driven, and the current sinking terminal is used to connect to the second pole of the circuit to be driven. The first potential of the current pulling terminal and the second potential of the current sinking terminal are both greater than the potential of the common potential terminal, and the first potential is greater than the second potential, so as to form a current loop that flows through the current pulling terminal, the first pole of the circuit to be driven, the second pole of the circuit to be driven and the current sinking terminal in sequence.

[0007] In one embodiment, the power module includes:

[0008] A first power supply unit, the first power supply unit includes a first channel and a second channel, wherein the positive terminal of the first channel serves as the current sourcing terminal, the negative terminal of the first channel serves as the current sinking terminal, the positive terminal of the second channel serves as the auxiliary terminal, the negative terminal of the second channel serves as the common potential terminal, and the target potential terminal serves as the current sourcing terminal;

[0009] Optionally, the first power supply unit is a power supply chip;

[0010] Optionally, the first power supply unit is configured to store a preset voltage difference value, where the preset voltage difference value is a difference between the first potential and the second potential, and the preset voltage difference value is smaller than the first potential.

[0011] In one embodiment, the power module includes:

[0012] A second power supply unit, wherein the second power supply unit is configured with a positive terminal and a negative terminal, wherein the positive terminal of the second power supply unit serves as the current pulling terminal, and the negative terminal of the second power supply unit serves as the common potential terminal;

[0013] a third power supply unit, wherein the third power supply unit is configured with a positive terminal and a negative terminal, wherein the positive terminal of the third power supply unit serves as the current sink terminal, the negative terminal of the third power supply unit serves as the auxiliary terminal, and the target potential terminal serves as the common potential terminal;

[0014] Optionally, the second power supply unit is a current sourcing power supply chip, and the third power supply unit is a current sinking power supply chip.

[0015] In one embodiment, the power module further includes:

[0016] a fourth power supply unit, the fourth power supply unit being used to provide one or more of a pull-up voltage, a timing driving logic voltage, a first reference voltage and a second reference voltage to a display panel including a circuit to be driven;

[0017] Optionally, the fourth power supply unit is a power management chip.

[0018] In one embodiment, the power module further includes:

[0019] a first circuit board, on which the second power supply unit, the third power supply unit and the fourth power supply unit are integrated;

[0020] Optionally, the first circuit board is a timing control circuit board;

[0021] Optionally, the power module further includes a first heat dissipation component disposed on the first circuit board.

[0022] In one embodiment, the power module further includes:

[0023] a first circuit board, wherein the fourth power supply unit is integrated on the first circuit board;

[0024] a second circuit board, wherein the second power supply unit and the third power supply unit are integrated on the first circuit board;

[0025] Optionally, the first circuit board is a timing control circuit board, and the second circuit board is an application processor mainboard;

[0026] Optionally, the power module further includes a second heat dissipation component disposed on the second circuit board.

[0027] In a second aspect, a display panel is provided, comprising a pixel circuit, a light-emitting device and a power supply module as described in any of the above embodiments; wherein the pixel circuit is connected to the anode of the light-emitting device, the current-sourcing end of the power supply module is connected to the first power supply end of the pixel circuit, and the current-sinking end of the power supply module is connected to the cathode of the light-emitting device.

[0028] In one embodiment, each transistor in the pixel circuit is an N-type transistor;

[0029] Optionally, each transistor in the pixel circuit is an indium gallium zinc oxide transistor.

[0030] In one of the embodiments, the pixel circuit includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a storage capacitor and a light emitting device;

[0031] The first end of the first transistor is connected to the first end of the fifth transistor, the second end of the fifth transistor is connected to the current pulling end of the power module, and the control end of the fifth transistor is connected to the light emitting control end;

[0032] The second end of the first transistor is connected to the first end of the sixth transistor, the second end of the sixth transistor is connected to the anode of the light emitting device, the control end of the sixth transistor is connected to the light emitting control end, wherein the cathode of the light emitting device is connected to the current injection end of the power module;

[0033] The first end of the second transistor is connected to the first end of the sixth transistor, the second end of the second transistor is connected to the data writing end, and the control end of the second transistor is connected to the second scanning end;

[0034] The first end of the third transistor is connected to the first end of the fifth transistor, the second end of the third transistor is connected to the control end of the first transistor, and the control end of the third transistor is connected to the first scanning end;

[0035] The first end of the fourth transistor is connected to the first end of the storage capacitor, the second end of the fourth transistor is connected to the initialization end, the control end of the fourth transistor is connected to the first scanning end, wherein the second end of the storage capacitor is connected to the control end of the first transistor.

[0036] In a third aspect, a display device is provided, comprising a display panel as described in any of the above embodiments.

[0037] The power supply module includes a common potential terminal, a current pulling terminal, a current injection terminal and an auxiliary terminal, wherein the common potential terminal is used to access the reference potential of the circuit to be driven, the reference potential is, for example, equal to zero, the current pulling terminal is used to connect to the first pole of the circuit to be driven, the current injection terminal is used to connect to the second pole of the circuit to be driven, and the auxiliary terminal is connected to the target potential terminal, the target potential terminal is the common potential terminal or the current pulling terminal. By setting the first potential of the current pulling terminal and the second potential of the current injection terminal to be greater than the potential of the common potential terminal, the reference potential connected to the common potential terminal is, for example, equal to zero, and the first potential is greater than the second potential, a current loop can be formed that flows through the current pulling terminal, the first pole of the circuit to be driven, the second pole of the circuit to be driven and the current injection terminal in sequence, and the circuit to be driven can be a pixel circuit of an oxide type circuit, thereby meeting the cut-off voltage requirement of the transistor in the pixel circuit, thereby achieving reliable cut-off of the transistor in the pixel circuit, thereby solving the technical problem that the display device does not display black state, and improving the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] FIG1 is a schematic structural diagram of a power module according to an embodiment;

[0040] FIG2 is a schematic diagram of the structure of a power module according to another embodiment;

[0041] FIG3 is a schematic structural diagram of a power module according to another embodiment;

[0042] Figure 4 is a schematic structural diagram of a power module of another embodiment;

[0043] Figure 5 is a schematic structural diagram of a power module of another embodiment;

[0044] Figure 6 is a schematic structural diagram of a pixel circuit according to an embodiment;

[0045] Figure 7 FIG. 4 is a schematic structural diagram of a pixel circuit according to another embodiment.

[0046] Description of reference numerals:

[0047] 101-current pulling terminal, 102-current pouring terminal, 103-common potential terminal, 104-auxiliary terminal, 110-first power supply unit, 120-second power supply unit, 130-third power supply unit, 140-fourth power supply unit, 150-first circuit board, 160-second circuit board; M1-first transistor, M2-second transistor, M3-third transistor, M4-fourth transistor, M5-fifth transistor, M6-sixth transistor, Cst-storage capacitor, D-light-emitting device; CH1-first channel, CH2-second channel. DETAILED DESCRIPTION

[0048] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0050] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0051] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0052] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least part of an element” means part or all of an element.

[0053] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0054] As mentioned in the background technology, when the pixel circuit is an oxide type circuit, there is a phenomenon that the transistor in the pixel circuit cannot be reliably cut off. The inventors have found that the reason is that the pixel circuit is an oxide type circuit, which means that the transistor in the pixel circuit is an N-type transistor. The cut-off requirement of the N-type transistor is that the gate-source voltage Vgs is less than 0.7V. Take the driving transistor in the pixel circuit for generating a driving current as an example, where the driving current is used to drive the light-emitting device to emit light:

[0055] The gate-source voltage Vgs of the driving transistor is equal to the difference between the data voltage Vdata and the voltage ELVSS connected to the cathode of the light-emitting device, that is, Vgs=Vdata-ELVSS; in this regard, since in the related art, the data voltage Vdata provided is greater than zero (that is, a positive value), and the voltage ELVSS provided to the cathode of the light-emitting device is less than zero (that is, a negative value), it is difficult for Vgs to be less than 0.7V, thereby causing the driving transistor to be unable to be reliably cut off; the inability of the driving transistor to be reliably cut off alone can cause the display of the display device to appear non-black in the black state, thereby reducing the display effect of the display device.

[0056] To this end, an embodiment of the present application provides a power supply module, wherein a common potential terminal 103 is connected to a reference potential of a pixel circuit, and the reference potential of the pixel circuit is equal to zero, for example. The voltage ELVSS of the cathode of the light-emitting device received by the current injection terminal 102 is greater than the potential of the common potential terminal 103. The voltage ELVDD output by the current source terminal 101 to the first power supply terminal of the pixel circuit is greater than the voltage ELVSS of the cathode of the light-emitting device. A current loop is formed that flows through the current source terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device and the current injection terminal 102 in sequence, thereby achieving reliable cutoff of the transistor in the pixel circuit, thereby solving the technical problem that the display device does not display a black state, and improving the display effect of the display device.

[0057] In an exemplary embodiment, referring to FIG. 1 , a power supply module is provided. The power supply module includes a common potential terminal 103 , a current source terminal 101 , a current sink terminal 102 , and an auxiliary terminal 104 .

[0058] The common potential terminal 103 is used to access the reference potential GND of the circuit to be driven. The circuit to be driven is, for example, a pixel circuit in an OLED display device, and the reference potential GND of the pixel circuit in the OLED display device is, for example, equal to zero, that is, the reference potential GND is grounded. The common potential terminal 103 can be connected to the reference potential terminal of the circuit to be driven, so that the common potential terminal 103 is connected to the reference potential GND of the circuit to be driven.

[0059] The current-sourcing terminal 101 is used to connect to the first electrode of the circuit to be driven, and the current-sinking terminal 102 is used to connect to the second electrode of the circuit to be driven. The first electrode of the circuit to be driven is, for example, the first power supply terminal of the pixel circuit, which is used to receive the first potential ELVDD output by the current-sourcing terminal 101; the second electrode of the circuit to be driven is, for example, the second power supply terminal of the pixel circuit, which can be understood as the cathode of the light-emitting device, and is used to output the second potential ELVSS to the current-sinking terminal 102.

[0060] The auxiliary terminal 104 is connected to the target potential terminal, and the target potential terminal is the common potential terminal 103 or the current pulling terminal 101. The common potential terminal 103, the current pulling terminal 101, and the current sinking terminal 102 can be respectively composed of different positive terminals +, negative terminals -, etc. of the power chip. When the common potential terminal 103, the current pulling terminal 101, and the current sinking terminal 102 are composed of different positive terminals +, negative terminals -, the target potential terminal is selected differently. When the target potential terminal is the common potential terminal 103, the auxiliary terminal 104 is connected to the common potential terminal 103. When the target potential terminal is the current pulling terminal 101, the auxiliary terminal 104 is connected to the current pulling terminal 101.

[0061] The first potential ELVDD of the current source terminal 101 and the second potential ELVSS of the current sink terminal 102 are both greater than the potential of the common potential terminal 103, and the first potential ELVDD is greater than the second potential ELVSS, so as to form a current loop that sequentially flows through the current source terminal 101, the first electrode of the circuit to be driven, the second electrode of the circuit to be driven, and the current sink terminal 102. For example, if the first potential ELVDD and the second potential ELVSS are both greater than the reference potential GND and the first potential ELVDD is greater than the second potential ELVSS, a current loop that sequentially flows through the current source terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current sink terminal 102 can be formed.

[0062] According to the technical solution of the embodiment of the present application, when the pixel circuit is an oxide type circuit, since the first potential ELVDD provided by the current pulling terminal 101 of the power module to the first power supply terminal of the pixel circuit and the second potential ELVSS of the cathode of the light-emitting device received by the current pouring terminal 102 are both greater than the reference potential GND of the pixel circuit, the reference potential GND is equal to zero, and a current loop can be formed that flows through the current pulling terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device and the current pouring terminal 102 in sequence, so that the gate-source voltage Vgs of the driving transistor in the pixel circuit can be less than 0.7V, thereby realizing reliable cutoff of the driving transistor, thereby solving the technical problem that the display device does not display the black state, improving the display effect of the display device, and the driving transistor can be both reliably turned on and reliably turned off based on this solution, so that the display device can be normally lit and the black state is dark enough. At the same time, the technical solution of the embodiment of the present application can achieve reliable cutoff of the driving transistor only by providing a power supply module that has both the current sourcing output capability and the current sinking receiving capability, without making any changes to the driving circuit that generates the data voltage Vdata (for example, there is no need to make the data voltage Vdata a negative value), so the solution is simple, effective, reliable and easy to implement.

[0063] In an exemplary embodiment, referring to Figure 2, the power supply module includes a first power supply unit 110; the first power supply unit 110 includes a first channel CH1 and a second channel CH2; the positive terminal + of the first channel CH1 serves as a current source terminal 101, and the negative terminal - of the first channel CH1 serves as a current sink terminal 102; the positive terminal + of the second channel CH2 serves as an auxiliary terminal 104, and the negative terminal - of the second channel CH2 serves as a common potential terminal 103; the target potential terminal is the current source terminal 101.

[0064] Among them, the first channel CH1 and the second channel CH2 belong to the two output channels of the first power supply unit 110 itself, and each output channel is configured with a positive terminal + and a negative terminal -, that is, the first channel CH1 and the second channel CH2 are both configured with a positive terminal + and a negative terminal -. The positive terminal + of the first channel CH1 and the positive terminal + of the second channel CH2 are short-circuited together, and the positive terminal + of the first channel CH1 is led out as the current pulling terminal 101, the current pulling terminal 101 outputs the first potential ELVDD, the negative terminal - of the first channel CH1 is used as the current sinking terminal 102, the current sinking terminal 102 receives the second potential ELVSS, and the negative terminal - of the second channel CH2 is connected to the reference potential GND of the pixel circuit; in this way, the first potential ELVDD and the second potential ELVSS are both greater than the reference potential GND and the first potential ELVDD is greater than the second potential ELVSS, forming a current loop that flows through the current pulling terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device and the current sinking terminal 102 in sequence.

[0065] In an exemplary embodiment, with continued reference to FIG. 2 , a preset voltage difference value is configured and stored in the first power supply unit 110, and the preset voltage difference value is the difference between the first potential ELVDD and the second potential ELVSS, and the preset voltage difference value is less than the first potential ELVDD. Since the preset voltage difference value is greater than zero, when the first potential ELVDD is greater than the preset voltage difference value, it can be ensured that the second potential ELVSS is greater than the reference potential GND, that is, the second potential ELVSS is ensured to be greater than zero, thus forming a current loop that flows sequentially through the current source terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current sink terminal 102.

[0066] In this embodiment, the first potential ELVDD and the second potential ELVSS use only one channel, that is, the first potential ELVDD uses the positive terminal + of the first channel CH1, and the second potential ELVSS uses the negative terminal - of the first channel CH1, which can avoid the first potential ELVDD and the second potential ELVSS using two channels, resulting in raising the voltage of the channel used by the second potential ELVSS.

[0067] In an exemplary embodiment, with continued reference to FIG. 2 , the first power supply unit 110 is a power supply chip. In the embodiment of the present application, a conventional power supply chip including two output channels in the art is adopted, and its positive terminal + and negative terminal - are correspondingly connected by adopting the above-mentioned technical solution of the present application, and the power supply chip is configured with a first potential ELVDD and a preset voltage difference value, so that the first potential ELVDD and the second potential ELVSS are both greater than the reference potential GND and the first potential ELVDD is greater than the second potential ELVSS, forming a current loop that flows through the current source terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current sink terminal 102 in sequence.

[0068] In an exemplary embodiment, referring to Figure 3, the power supply module includes a second power supply unit and a third power supply unit 130; the second power supply unit is configured with a positive terminal + and a negative terminal -, the positive terminal + of the second power supply unit serves as a current pulling terminal 101, and the negative terminal - of the second power supply unit serves as a common potential terminal 103; the third power supply unit 130 is configured with a positive terminal + and a negative terminal -, the positive terminal + of the third power supply unit 130 serves as a current injection terminal 102, and the negative terminal - of the third power supply unit 130 serves as an auxiliary terminal 104; the target potential terminal is the common potential terminal 103.

[0069] Among them, the second power supply unit itself has a positive terminal + and a negative terminal -, and the third power supply unit 130 itself also has a positive terminal + and a negative terminal -. The positive terminal + of the second power supply unit is used as the current pulling terminal 101, the negative terminal - of the second power supply unit is connected to the reference potential GND of the pixel circuit, the positive terminal + of the third power supply unit 130 is used as the current injection terminal 102, and the negative terminal - of the third power supply unit 130 is short-circuited with the negative terminal - of the second power supply unit. In this way, it can be achieved that the first potential ELVDD and the second potential ELVSS are both greater than the reference potential GND and the first potential ELVDD is greater than the second potential ELVSS, forming a current loop that flows through the current pulling terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device and the current injection terminal 102 in sequence.

[0070] In an exemplary embodiment, with continued reference to FIG3 , the second power supply unit is a current sourcing power supply chip, and the third power supply unit 130 is a current sinking power supply chip. The positive terminal + and the negative terminal - of the current sourcing power supply chip are respectively used as the positive terminal + and the negative terminal - of the second power supply unit, and the positive terminal + and the negative terminal - of the current sinking unit are respectively used as the positive terminal + and the negative terminal - of the third power supply unit 130.

[0071] The solution of the embodiment of the present application can not only adopt a conventional power chip with two output channels to form a power module with both current sourcing output capability and current sinking receiving capability, but also adopt a current sourcing power chip and a current sinking power chip to form a power module with both current sourcing output capability and current sinking receiving capability. The power module has a simple structure, is easy to implement and has a relatively low cost.

[0072] In an exemplary embodiment, the power supply module also includes a fourth power supply unit 140, which is used to provide one or more of a pull-up voltage Vio, a timing drive logic voltage DVDD, a first reference voltage VGH and a second reference voltage VGL to a display panel including a circuit / pixel circuit to be driven.

[0073] In an exemplary embodiment, the fourth power supply unit 140 is a power management chip PMIC.

[0074] In an exemplary embodiment, referring to Figure 4 The power module further includes a first circuit board 150 ; a second power unit, a third power unit 130 and a fourth power unit 140 are integrated on the first circuit board 150 .

[0075] In an exemplary embodiment, continue to refer to Figure 4 , the first circuit board 150 is a timing control circuit board (Timing Controller Board, TCON Board).

[0076] Among them, the second power supply unit, the third power supply unit 130 and the fourth power supply unit 140 are all integrated on the timing control circuit board, which is conducive to saving the space occupied by the power supply module in the display device. In addition, the second power supply unit, the third power supply unit 130 and the fourth power supply unit 140 are all integrated on the timing control circuit board, and the voltage Vsys provided by the system board can be used to synchronously power the second power supply unit, the third power supply unit 130 and the fourth power supply unit 140, thereby simplifying the power supply method of the second power supply unit and the third power supply unit 130, and saving the power supply cost of the second power supply unit and the third power supply unit 130.

[0077] In an exemplary embodiment, continue to refer to Figure 4 The power module further includes a first heat dissipation component (not shown in the figure) disposed on the first circuit board 150 .

[0078] Among them, when the values ​​of the first potential ELVDD and the second potential ELVSS are both large, since the voltage Vsys provided by the system board is small (generally 3.3V~12V), the temperature of the second power supply unit 130 will be high at this time. In this regard, heat dissipation can be achieved by setting a first heat dissipation component on the first circuit board 150.

[0079] In an exemplary embodiment, the first heat dissipation component can be a heat conduction component, the material of the heat conduction component can be metal, thermal grease, etc., and the heat conduction component can be in direct contact with the second power supply unit and the third power supply unit 130 to dissipate heat from the second power supply unit and the third power supply unit 130.

[0080] In an exemplary embodiment, the first heat dissipation component may be a heat dissipation hole provided on the first circuit board 150 , that is, the heat is dissipated from the second power supply unit and the third power supply unit 130 through the heat dissipation hole on the first circuit board 150 .

[0081] In an exemplary embodiment, referring to Figure 5 The power module further includes a first circuit board 150 and a second circuit board 160 ; the first circuit board 150 is integrated with a fourth power unit 140 ; ​​the second circuit board 160 is integrated with a second power unit and a third power unit 130 .

[0082] In an exemplary embodiment, continue to refer to Figure 5 The first circuit board 150 is a timing control circuit board (Timing Controller Board, TCON Board), and the second circuit board 160 is an application processor main board (Application Processor Main Board, AP Main Board).

[0083] The fourth power supply unit 140 is integrated on the first circuit board 150, and the voltage Vsys provided by the system board supplies power to the fourth power supply unit 140; the second power supply unit and the third power supply unit 130 are integrated on the second circuit board 160, and the voltage Vbat provided by the battery synchronously supplies power to the second power supply unit and the third power supply unit 130. Generally, the voltage Vbat provided by the battery is greater than the voltage Vsys provided by the system board, so the voltage Vbat provided by the battery supplies power to the second power supply unit and the third power supply unit 130, which can adapt to the situation where the values ​​of the first potential ELVDD and the second potential ELVSS are both large.

[0084] In an exemplary embodiment, continue to refer to Figure 5 The power module also includes a second heat dissipation component disposed on the second circuit board 160 .

[0085] The second heat dissipation component may be a fan or a heat dissipation channel arranged on the second circuit board 160 .

[0086] In an exemplary embodiment, a display panel is provided, which includes a pixel circuit, a light-emitting device, and a power supply module as provided in any of the above embodiments; wherein the pixel circuit is an oxide type circuit, the pixel circuit is connected to the anode of the light-emitting device, the current pulling terminal 101 of the power supply module is connected to the first power supply terminal of the pixel circuit, and the current injection terminal 102 of the power supply module is connected to the cathode of the light-emitting device.

[0087] In an exemplary embodiment, each transistor in the pixel circuit is an N-type transistor. Thus, the first potential ELVDD and the second potential ELVSS provided by the power module can reliably turn off the N-type transistor in the pixel circuit.

[0088] In an exemplary embodiment, each transistor in the pixel circuit is an InGaZnO transistor, so that each transistor in the pixel circuit is an N-type transistor.

[0089] In an exemplary embodiment, referring to Figure 6 , the pixel circuit includes a first transistor M1, a second transistor M2 and a storage capacitor Cst, wherein the first transistor M1 is a driving transistor in the pixel circuit, and the control terminal of the first transistor M1 is a gate of the driving transistor; wherein,

[0090] The first end of the first transistor M1 is connected to the current pulling end 101 of the power module, that is, the first end of the first transistor M1 serves as the first power terminal of the pixel circuit, the second end of the first transistor M1 is connected to the anode of the light emitting device D, and the cathode of the light emitting device D is connected to the current pouring end 102 of the power module; the storage capacitor Cst is connected between the first end of the first transistor M1 and the control end of the first transistor M1; the first end of the second transistor M2 is connected to the control end of the first transistor M1, the second end of the second transistor M2 is connected to the data writing end, and the control end of the second transistor M2 is connected to the second scanning end.

[0091] In an exemplary embodiment, referring to Figure 7 , the pixel circuit includes a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a storage capacitor Cst and a light-emitting device D, wherein the first transistor M1 is a driving transistor in the pixel circuit, and the control terminal of the first transistor M1 is a gate of the driving transistor; wherein,

[0092] The first end of the first transistor M1 is connected to the first end of the fifth transistor M5, the second end of the fifth transistor M5 is connected to the current source end 101 of the power module, the control end of the fifth transistor M5 is connected to the light emitting control end, wherein the second end of the fifth transistor M5 serves as the first power supply end of the pixel circuit;

[0093] The second end of the first transistor M1 is connected to the first end of the sixth transistor M6, the second end of the sixth transistor M6 is connected to the anode of the light emitting device D, the control end of the sixth transistor M6 is connected to the light emitting control end, wherein the cathode of the light emitting device D is connected to the current sink end 102 of the power module;

[0094] The first end of the second transistor M2 is connected to the first end of the sixth transistor M6, the second end of the second transistor M2 is connected to the data writing end, and the control end of the second transistor M2 is connected to the second scanning end;

[0095] A first end of the third transistor M3 is connected to the first end of the fifth transistor M5, a second end of the third transistor M3 is connected to the control end of the first transistor M1, and a control end of the third transistor M3 is connected to the first scanning end;

[0096] The first end of the fourth transistor M4 is connected to the first end of the storage capacitor Cst, the second end of the fourth transistor M4 is connected to the initialization end, the control end of the fourth transistor M4 is connected to the first scanning end, wherein the second end of the storage capacitor Cst is connected to the control end of the first transistor M1.

[0097] The light-emitting control terminal is used to receive the light-emitting control signal EM, the data writing terminal is used to receive the data voltage Vdata, the first scanning terminal and the second scanning terminal are used to receive the first scanning signal Scan1 and the second scanning signal Scan2 respectively, and the initialization terminal is used to receive the initialization voltage Vref.

[0098] Among them, when the pixel circuit works in the initialization stage, the initialization voltage Vref initializes the control end of the first transistor M1; when the pixel circuit works in the data writing and threshold compensation stage, the second transistor M2 and the third transistor M3 write the data voltage Vdata into the control end of the first transistor M1, and threshold compensation is performed on the threshold voltage Vth of the first transistor M1; in the light emitting stage of the light emitting device D, the fifth transistor M5 and the sixth transistor M6 control the light emitting device D to emit light according to the light emitting control signal EM.

[0099] In the solution of the embodiment of the present application, when the first transistor M1 is an N-type transistor, the first transistor M1 can be reliably cut off based on the power module, so that the display panel can be normally lit and the black state is dark enough. Among them, the current source terminal 101 of the power module provides the first potential ELVDD to the first end of the first transistor M1, and the current sink terminal 102 of the power module provides the second potential ELVSS to the cathode of the light-emitting device D. The first potential ELVDD and the second potential ELVSS are both greater than the reference potential GND and the first potential ELVDD is greater than the second potential ELVSS, so that the cut-off requirement of the first transistor M1 can be met, that is, the gate-source voltage Vgs of the first transistor M1 can be less than 0.7V, so that the first transistor M1 can be reliably cut off, thereby solving the technical problem that the black state displayed by the display device is not dark enough.

[0100] The display panel and power module provided in the embodiments of the present application belong to the same inventive concept, can solve the same technical problems, and thus achieve the same technical effects, and the repeated contents will not be repeated here.

[0101] In an exemplary embodiment, a display device is provided, which includes a display panel provided in any of the above embodiments. The display device may be an OLED display device. The display device may be a mobile phone, a tablet computer, a television, a wearable electronic product, etc.

[0102] The display device and the display panel in the embodiment of the present application belong to the same inventive concept, can solve the same technical problem, and thus achieve the same technical effect, and the repeated contents will not be repeated here.

[0103] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0104] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A power module, characterized in that: The power supply module includes a common potential terminal, a current sourcing terminal, a current sinking terminal and an auxiliary terminal, wherein the auxiliary terminal is connected to a target potential terminal, and the target potential terminal is the common potential terminal or the current sourcing terminal; Among them, the common potential terminal is used to connect to the reference potential of the circuit to be driven, the current pulling terminal is used to connect to the first pole of the circuit to be driven, and the current sinking terminal is used to connect to the second pole of the circuit to be driven. The first potential of the current pulling terminal and the second potential of the current sinking terminal are both greater than the potential of the common potential terminal, and the first potential is greater than the second potential, so as to form a current loop that flows through the current pulling terminal, the first pole of the circuit to be driven, the second pole of the circuit to be driven and the current sinking terminal in sequence.

2. The power module according to claim 1, characterized in that: The power module comprises: A first power supply unit, the first power supply unit includes a first channel and a second channel, wherein the positive terminal of the first channel serves as the current sourcing terminal, the negative terminal of the first channel serves as the current sinking terminal, the positive terminal of the second channel serves as the auxiliary terminal, the negative terminal of the second channel serves as the common potential terminal, and the target potential terminal serves as the current sourcing terminal; Optionally, the first power supply unit is configured with and stores a preset voltage difference value, the preset voltage difference value is a difference between the first potential and the second potential, and the preset voltage difference value is smaller than the first potential; Optionally, the first power supply unit is a power supply chip.

3. The power module according to claim 1, characterized in that: The power module comprises: A second power supply unit, wherein the second power supply unit is configured with a positive terminal and a negative terminal, wherein the positive terminal of the second power supply unit serves as the current pulling terminal, and the negative terminal of the second power supply unit serves as the common potential terminal; a third power supply unit, wherein the third power supply unit is configured with a positive terminal and a negative terminal, wherein the positive terminal of the third power supply unit serves as the current sink terminal, the negative terminal of the third power supply unit serves as the auxiliary terminal, and the target potential terminal serves as the common potential terminal; Optionally, the second power supply unit is a current sourcing power supply chip, and the third power supply unit is a current sinking power supply chip.

4. The power module according to claim 3, characterized in that: The power module also includes: a fourth power supply unit, the fourth power supply unit being used to provide one or more of a pull-up voltage, a timing driving logic voltage, a first reference voltage and a second reference voltage to a display panel including a circuit to be driven; Optionally, the fourth power supply unit is a power management chip.

5. The power module according to claim 4, characterized in that: The power module also includes: a first circuit board, on which the second power supply unit, the third power supply unit and the fourth power supply unit are integrated; Optionally, the power module further includes a first heat dissipation component disposed on the first circuit board.

6. The power module according to claim 4, characterized in that: The power module also includes: a first circuit board, wherein the fourth power supply unit is integrated on the first circuit board; a second circuit board, wherein the second power supply unit and the third power supply unit are integrated on the first circuit board; Optionally, the power module further includes a second heat dissipation component disposed on the second circuit board.

7. The power module according to any one of claims 5 or 6, characterized in that: The first circuit board is a timing control circuit board, and the second circuit board is an application processor mainboard.

8. A display panel, characterized in that: It comprises a pixel circuit, a light-emitting device and a power supply module as described in any one of claims 1 to 7; wherein the pixel circuit is connected to the anode of the light-emitting device, the current-sourcing end of the power supply module is connected to the first power supply end of the pixel circuit, and the current-sinking end of the power supply module is connected to the cathode of the light-emitting device.

9. The display panel according to claim 8, characterized in that: The type of each transistor in the pixel circuit is an N-type transistor; Optionally, each transistor in the pixel circuit is an indium gallium zinc oxide transistor.

10. A display device, characterized in that: A display panel comprising any one of claims 5 or 6.

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