Power module, display panel and display device

Abstract

This application relates to a power supply module, a display panel, and a display device. The power supply module includes a common potential terminal, a current-source terminal, a current-sinking terminal, and an auxiliary terminal, wherein the auxiliary terminal is connected to a target potential terminal, which can be either the common potential terminal or the current-source terminal. The common potential terminal is used to connect to a reference potential of the circuit to be driven, the current-source terminal is used to connect to the first terminal of the circuit to be driven, and the current-sinking terminal is used to connect to the second terminal of the circuit to be driven. The first potential of the current-source 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 sequentially through the current-source terminal, the first terminal of the circuit to be driven, the second terminal of the circuit to be driven, and the current-sinking terminal. This achieves reliable cutoff of the transistors in the pixel circuit, thereby solving the technical problem of black states not being completely black in the display device and improving the display effect of the display device.

Description

Technical Field

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

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

[0003] Currently, in related technologies, the power supply voltage ELVDD provided by the power module in the display device to the pixel circuit is positive, and the voltage ELVSS provided to the cathode of the light-emitting device is negative. When the pixel circuit is an oxide circuit, there is a phenomenon that the display device's black state is not black because the transistors in the pixel circuit cannot be reliably cut off, which greatly reduces the display effect of the display device. Summary of the Invention

[0004] To address the aforementioned technical issues, it is necessary to provide a power supply module, display panel, and display device that can reliably cut off transistors in pixel circuits, thereby improving the display effect of the display device.

[0005] In a first aspect, a power module is provided, the power module including 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 either the common potential terminal or the current sourcing terminal;

[0006] The common potential terminal is used to connect to the reference potential of the circuit to be driven, the current-pull 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-pull 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 sequentially through the current-pull terminal, the first pole of the circuit to be driven, the second pole of the circuit to be driven, and the current-sinking terminal.

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

[0008] 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-pull 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-pull terminal.

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

[0010] Optionally, the first power supply unit is configured with and stores a preset differential voltage value, the preset differential voltage value being the difference between the first potential and the second potential, and the preset differential voltage value being less than the first potential.

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

[0012] 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-pull terminal, and the negative terminal of the second power supply unit serves as the common potential terminal.

[0013] 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 sinking 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-source 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] The fourth power supply unit is used to provide one or more of a pull-up voltage, a timing drive logic voltage, a first reference voltage, and a second reference voltage to the display panel containing the 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, on which the fourth power supply unit is integrated;

[0024] The second circuit board, on which the second power supply unit and the third power supply unit are integrated;

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

[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, including a pixel circuit, a light-emitting device, and a power 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-pull terminal of the power module is connected to the first power supply terminal of the pixel circuit, and the current-sinking terminal of the power module is connected to the cathode of the light-emitting device.

[0028] In one embodiment, all transistors in the pixel circuit are N-type transistors;

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

[0030] In one embodiment, 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 terminal of the first transistor is connected to the first terminal of the fifth transistor, the second terminal of the fifth transistor is connected to the current-pull terminal of the power supply module, and the control terminal of the fifth transistor is connected to the light-emitting control terminal.

[0032] The second terminal of the first transistor is connected to the first terminal of the sixth transistor, the second terminal of the sixth transistor is connected to the anode of the light-emitting device, the control terminal of the sixth transistor is connected to the light-emitting control terminal, and the cathode of the light-emitting device is connected to the current sinking terminal of the power supply module.

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

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

[0035] The first terminal of the fourth transistor is connected to the first terminal of the storage capacitor, the second terminal of the fourth transistor is connected to the initialization terminal, and the control terminal of the fourth transistor is connected to the first scan terminal. The second terminal of the storage capacitor is connected to the control terminal of the first transistor.

[0036] Thirdly, a display device is provided, including a display panel as described in any of the above embodiments.

[0037] The aforementioned power module includes a common potential terminal, a current-source terminal, a current-sinking terminal, and an auxiliary terminal. The common potential terminal is used to connect to a reference potential of the circuit to be driven, such as zero. The current-source terminal is connected to the first terminal of the circuit to be driven, and the current-sinking terminal is connected to the second terminal of the circuit to be driven. The auxiliary terminal is connected to a target potential terminal, which can be either the common potential terminal or the current-source terminal. By setting the first potential of the current-source terminal and the second potential of the current-sinking terminal to be greater than the potential of the common potential terminal, and ensuring that the reference potential connected to the common potential terminal is zero and the first potential is greater than the second potential, a current loop is formed that flows sequentially through the current-source terminal, the first terminal of the circuit to be driven, the second terminal of the circuit to be driven, and the current-sinking terminal. The circuit to be driven can be a pixel circuit of oxide type. This achieves the cutoff voltage requirement of the transistors in the pixel circuit, thus ensuring reliable cutoff of the transistors and solving the technical problem of incomplete black states in the display device, thereby improving the display effect. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a power module according to one embodiment;

[0040] Figure 2 This is a schematic diagram of the power module structure according to another embodiment;

[0041] Figure 3 This is a schematic diagram of the power module structure according to another embodiment;

[0042] Figure 4This is a schematic diagram of the power module structure according to another embodiment;

[0043] Figure 5 This is a schematic diagram of the power module structure according to another embodiment;

[0044] Figure 6 This is a schematic diagram of the structure of a pixel circuit according to one embodiment;

[0045] Figure 7 This is a schematic diagram of the pixel circuit in another embodiment.

[0046] Explanation of reference numerals in the attached figures:

[0047] 101 - Current extraction terminal, 102 - Current sinking 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 Implementation

[0048] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0050] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. 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 is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0052] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0053] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0054] As mentioned in the background section, when the pixel circuit is an oxide-type circuit, there is a phenomenon where the transistors in the pixel circuit cannot be reliably turned off. The inventors discovered that the reason is that the pixel circuit is an oxide-type circuit, meaning the transistors in the pixel circuit are N-type transistors. The cutoff requirement for N-type transistors is a gate-source voltage Vgs less than 0.7V. Taking the driving transistor in the pixel circuit used to generate the 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, i.e., Vgs = Vdata - ELVSS. However, in related technologies, the provided data voltage Vdata is greater than zero (i.e., a positive value), and the voltage ELVSS supplied to the cathode of the light-emitting device is less than zero (i.e., a negative value), making it difficult for Vgs to be less than 0.7V. This results in the driving transistor not being able to be reliably turned off. The inability of the driving transistor to be reliably turned off alone can cause the display device to display black states that are not black, thus reducing the display effect of the display device.

[0056] To address this, this application provides a power supply module in which the common potential terminal 103 is connected to the reference potential of the pixel circuit. The reference potential of the pixel circuit is, for example, equal to zero. The voltage ELVSS of the cathode of the light-emitting device received by the current sink terminal 102 is greater than the potential of the common potential terminal 103. The voltage ELVDD output by the current sourcing 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. This forms a current loop that flows sequentially through the current sourcing terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current sink terminal 102. This ensures reliable cutoff of the transistors in the pixel circuit, thereby solving the technical problem of the display device not displaying black states properly and improving the display effect of the display device.

[0057] In one exemplary embodiment, reference is made to Figure 1 A power module is provided, which includes a common potential terminal 103, a current sourcing terminal 101, a current sinking terminal 102, and an auxiliary terminal 104.

[0058] The common potential terminal 103 is used to connect to 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. The reference potential GND of the pixel circuit in the OLED display device is, for example, equal to zero, i.e., grounded. The common potential terminal 103 can be connected to the reference potential terminal of the circuit to be driven, thus connecting the common potential terminal 103 to the reference potential GND of the circuit to be driven.

[0059] The current-pull terminal 101 is used to connect to the first terminal of the circuit to be driven, and the current-sinking terminal 102 is used to connect to the second terminal of the circuit to be driven. The first terminal of the circuit to be driven is, for example, the first power supply terminal of the pixel circuit, used to receive the first potential ELVDD output from the current-pull terminal 101; the second terminal 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, 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, which is either the common potential terminal 103 or the current-source terminal 101. The common potential terminal 103, the current-source terminal 101, and the current-sinking terminal 102 can each be constructed from different positive terminals (+) and negative terminals (-) of the power supply chip. The selection of the target potential terminal varies depending on whether the common potential terminal 103, the current-source terminal 101, and the current-sinking terminal 102 are constructed from different positive terminals (+) and negative terminals (-). 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-source terminal 101, the auxiliary terminal 104 is connected to the current-source terminal 101.

[0061] The first potential ELVDD of the current-pull terminal 101 and the second potential ELVSS of the current-sinking 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 flows sequentially through the current-pull terminal 101, the first terminal of the circuit to be driven, the second terminal of the circuit to be driven, and the current-sinking 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, then a current loop can be formed that flows sequentially through the current-pull terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current-sinking terminal 102.

[0062] In the embodiment of this application, when the pixel circuit is an oxide circuit, the first potential ELVDD provided by the current-pull terminal 101 of the power supply module to the first power supply terminal of the pixel circuit and the second potential ELVSS received by the cathode of the light-emitting device by the current-sinking 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 sequentially through the current-pull terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current-sinking terminal 102. This allows the gate-source voltage Vgs of the driving transistor in the pixel circuit to be less than 0.7V, thereby achieving reliable cutoff of the driving transistor. This solves the technical problem of the display device not being black enough in the black state, improves the display effect of the display device, and ensures that the driving transistor can be reliably turned on and reliably cut off based on this solution, so that the display device can be lit normally and the black state is black enough. Meanwhile, the technical solution of this application embodiment can reliably cut off the driving transistor by providing a power supply module that has both current output capability and current sinking capability, without making any changes to the driving circuit that generates the data voltage Vdata (e.g., without making the data voltage Vdata negative). Therefore, the solution is simple, effective, reliable and easy to implement.

[0063] In one exemplary embodiment, reference is made to Figure 2 The power module includes a first power unit 110; the first power unit 110 includes a first channel CH1 and a second channel CH2; the positive terminal + of the first channel CH1 serves as the current-pull terminal 101, and the negative terminal - of the first channel CH1 serves as the current-sinking terminal 102; the positive terminal + of the second channel CH2 serves as the auxiliary terminal 104, and the negative terminal - of the second channel CH2 serves as the common potential terminal 103; the target potential terminal is the current-pull terminal 101.

[0064] The first channel CH1 and the second channel CH2 are two output channels inherent in the first power supply unit 110. Each output channel is equipped with a positive terminal (+) and a negative terminal (-), meaning that both the first channel CH1 and the second channel CH2 are equipped 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 shorted together. Simultaneously, the positive terminal (+) of the first channel CH1 is led out as a current-pull terminal 101, which outputs a first potential ELVDD. The negative terminal (-) of the first channel CH1 serves as a current-sinking terminal 102, which receives a second potential ELVSS. The negative terminal (-) of the second channel CH2 is connected to the reference potential GND of the pixel circuit. Thus, both the first potential ELVDD and the second potential ELVSS are greater than the reference potential GND, and the first potential ELVDD is greater than the second potential ELVSS, forming a current loop that flows sequentially through the current-pull terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current-sinking terminal 102.

[0065] In one exemplary embodiment, reference continues to... Figure 2 The first power supply unit 110 is configured with and stores a preset voltage difference value. 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, it can be ensured that the second potential ELVSS is greater than zero. In this way, a current loop is formed that flows sequentially through the current-pull terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current-sinking 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. This avoids the voltage of the channel used by the second potential ELVSS being raised due to the first potential ELVDD and the second potential ELVSS using two channels.

[0067] In one exemplary embodiment, reference continues to... Figure 2 The first power supply unit 110 is a power supply chip. In this embodiment, a conventional power supply chip with two output channels is used. By adopting the above-mentioned technical solution of this application, its positive terminal + and negative terminal - are connected accordingly, and the power supply chip is configured with a first potential ELVDD and a preset voltage difference value. This ensures that both the first potential ELVDD and the second potential ELVSS are greater than the reference potential GND, and the first potential ELVDD is greater than the second potential ELVSS, forming a current loop that flows sequentially through the current-pull terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current-sinking terminal 102.

[0068] In one exemplary embodiment, reference is made to Figure 3 The power module includes a second power unit and a third power unit 130; the second power unit is configured with a positive terminal + and a negative terminal -, the positive terminal + of the second power unit serves as the current-pull terminal 101, and the negative terminal - of the second power unit serves as the common potential terminal 103; the third power unit 130 is configured with a positive terminal + and a negative terminal -, the positive terminal + of the third power unit 130 serves as the current-sinking terminal 102, and the negative terminal - of the third power unit 130 serves as the auxiliary terminal 104; the target potential terminal is the common potential terminal 103.

[0069] The second power supply unit has a positive terminal (+) and a negative terminal (-), and the third power supply unit 130 also has a positive terminal (+) and a negative terminal (-). The positive terminal (+) of the second power supply unit is used as the current-pull terminal 101, and 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-sinking terminal 102, and the negative terminal (-) of the third power supply unit 130 is shorted together with the negative terminal (-) of the second power supply unit. In this way, both the first potential ELVDD and the second potential ELVSS are greater than the reference potential GND, and the first potential ELVDD is greater than the second potential ELVSS, forming a current loop that flows sequentially through the current-pull terminal 101, the first power supply terminal of the pixel circuit, the cathode of the light-emitting device, and the current-sinking terminal 102.

[0070] In one exemplary embodiment, reference continues to... Figure 3 The second power supply unit is a current-source power supply chip, and the third power supply unit 130 is a current-sinking power supply chip. The positive (+) and negative (-) terminals of the current-source power supply chip serve as the positive (+) and negative (-) terminals of the second power supply unit, respectively, and the positive (+) and negative (-) terminals of the current-sinking unit serve as the positive (+) and negative (-) terminals of the third power supply unit 130, respectively.

[0071] The solution in this application embodiment can not only use a conventional power chip with two output channels to form a power module that has both current output capability and current sinking capability, but also use a current output power chip and a current sinking power chip to form a power module that has both current output capability and current sinking capability. The power module structure is simple, easy to implement, and has low cost.

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

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

[0074] In one exemplary embodiment, reference is made to Figure 4 The power module also includes a first circuit board 150; the first circuit board 150 integrates a second power unit, a third power unit 130 and a fourth power unit 140.

[0075] In one exemplary embodiment, reference continues to... Figure 4 The first circuit board 150 is a timing controller board (TCON board).

[0076] Integrating the second power supply unit, the third power supply unit 130, and the fourth power supply unit 140 onto a timing control circuit board saves space occupied by the power supply module in the display device. Furthermore, integrating these three power supply units onto the timing control circuit board allows for synchronous power supply to all three units via the voltage Vsys provided by the system board. This simplifies the power supply method for the second and third power supply units 130 and reduces their power supply costs.

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

[0078] When the values ​​of the first potential ELVDD and the second potential ELVSS are both large, the voltage Vsys provided by the system board is small (generally 3.3V~12V). At this time, the temperature of the second power supply unit and the third power supply unit 130 will be high. This 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 may be a heat conduction component, and the material of the heat conduction component may be metal, thermal grease, etc. The heat conduction component may be in direct contact with the second power unit and the third power unit 130 to dissipate heat from the second power unit and the third power 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, heat dissipation of the second power unit and the third power unit 130 is provided through the heat dissipation hole on the first circuit board 150.

[0081] In one exemplary embodiment, reference is made to Figure 5 The power module also includes a first circuit board 150 and a second circuit board 160; a fourth power unit 140 is integrated on the first circuit board 150; and a second power unit and a third power unit 130 are integrated on the second circuit board 160.

[0082] In one exemplary embodiment, reference continues to... Figure 5 The first circuit board 150 is a timing controller board (TCON board), and the second circuit board 160 is an 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 powers the fourth power supply unit 140. The second and third power supply units 130 are integrated on the second circuit board 160, and the voltage Vbat provided by the battery simultaneously powers the second and third power supply units 130. Typically, the voltage Vbat provided by the battery is greater than the voltage Vsys provided by the system board. Therefore, using the voltage Vbat provided by the battery to power the second and third power supply units 130 can accommodate situations where both the first potential ELVDD and the second potential ELVSS have relatively large values.

[0084] In one exemplary embodiment, reference continues 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 can be a fan or a heat dissipation channel arranged on the second circuit board 160.

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

[0087] In one exemplary embodiment, all transistors in the pixel circuit are N-type transistors. Thus, the first potential ELVDD and the second potential ELVSS provided by the power module reliably turn off the N-type transistors in the pixel circuit.

[0088] In one exemplary embodiment, each transistor in the pixel circuit is an indium gallium zinc oxide transistor. This ensures that each transistor in the pixel circuit is an N-type transistor.

[0089] In one exemplary embodiment, reference is made to Figure 6 The pixel circuit includes a first transistor M1, a second transistor M2, and a storage capacitor Cst. The first transistor M1 is the driving transistor in the pixel circuit, and its control terminal is the gate of the driving transistor.

[0090] The first terminal of the first transistor M1 is connected to the current-pull terminal 101 of the power supply module, that is, the first terminal of the first transistor M1 serves as the first power supply terminal of the pixel circuit. The second terminal 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-sinking terminal 102 of the power supply module. The storage capacitor Cst is connected between the first terminal of the first transistor M1 and the control terminal of the first transistor M1. The first terminal of the second transistor M2 is connected to the control terminal of the first transistor M1, the second terminal of the second transistor M2 is connected to the data writing terminal, and the control terminal of the second transistor M2 is connected to the second scanning terminal.

[0091] In one exemplary embodiment, reference is made 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. The first transistor M1 is the driving transistor in the pixel circuit, and the control terminal of the first transistor M1 is the gate of the driving transistor.

[0092] The first terminal of the first transistor M1 is connected to the first terminal of the fifth transistor M5, the second terminal of the fifth transistor M5 is connected to the current-pull terminal 101 of the power supply module, and the control terminal of the fifth transistor M5 is connected to the light-emitting control terminal. The second terminal of the fifth transistor M5 serves as the first power supply terminal of the pixel circuit.

[0093] The second terminal of the first transistor M1 is connected to the first terminal of the sixth transistor M6, the second terminal of the sixth transistor M6 is connected to the anode of the light-emitting device D, and the control terminal of the sixth transistor M6 is connected to the light-emitting control terminal. The cathode of the light-emitting device D is connected to the current sinking terminal 102 of the power supply module.

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

[0095] The first terminal of the third transistor M3 is connected to the first terminal of the fifth transistor M5, the second terminal of the third transistor M3 is connected to the control terminal of the first transistor M1, and the control terminal of the third transistor M3 is connected to the first scan terminal.

[0096] The first terminal of the fourth transistor M4 is connected to the first terminal of the storage capacitor Cst, the second terminal of the fourth transistor M4 is connected to the initialization terminal, and the control terminal of the fourth transistor M4 is connected to the first scan terminal. The second terminal of the storage capacitor Cst is connected to the control terminal of the first transistor M1.

[0097] Among them, the light emission control terminal is used to receive the light emission 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] Specifically, during the initialization phase of the pixel circuit, the initialization voltage Vref initializes the control terminal of the first transistor M1; during the data writing and threshold compensation phase of the pixel circuit, the second transistor M2 and the third transistor M3 write the data voltage Vdata to the control terminal of the first transistor M1 and perform threshold compensation on the threshold voltage Vth of the first transistor M1; during the light-emitting phase 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] The solution in this embodiment, when the first transistor M1 is an N-type transistor, can reliably cut off the first transistor M1 based on the power supply module, achieving normal illumination and sufficient black in the display panel. Specifically, the current-source terminal 101 of the power supply module provides a first potential ELVDD to the first terminal of the first transistor M1, and the current-source terminal 102 of the power supply module provides a second potential ELVSS to the cathode of the light-emitting device D. Both the first potential ELVDD and the second potential ELVSS are greater than the reference potential GND, and the first potential ELVDD is greater than the second potential ELVSS. This achieves the cutoff requirement of the first transistor M1, meaning the gate-source voltage Vgs of the first transistor M1 can be less than 0.7V, thus reliably cutting off the first transistor M1 and solving the technical problem of insufficient black in the display device.

[0100] The display panel and power module provided in the embodiments of this application belong to the same inventive concept, can solve the same technical problem, and thus achieve the same technical effect. Repeated content will not be repeated here.

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

[0102] The display device and display panel in the embodiments of this application belong to the same inventive concept, can solve the same technical problems, and thus achieve the same technical effects. Repeated content will not be repeated here.

[0103] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power supply module, characterized in that, The power module includes a common potential terminal, a current-pull terminal, a current-sinking terminal, and an auxiliary terminal, wherein the auxiliary terminal is connected to the target potential terminal, and the target potential terminal is either the common potential terminal or the current-pull terminal. The common potential terminal is used to connect to the reference potential of the circuit to be driven, the current-pull 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-pull 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 sequentially through the current-pull terminal, the first pole of the circuit to be driven, the second pole of the circuit to be driven, and the current-sinking terminal. The power module further includes a first power unit, which is a power chip. The first power unit includes a first channel and a second channel, wherein the positive terminal of the first channel serves as the current-pull 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-pull terminal. The first power unit is configured with and stores a preset voltage difference value, which is the difference between the first potential and the second potential, and the preset voltage difference value is less than the first potential; or... The power module further includes a second power unit and a third power unit; the second power unit is a current-pull power chip, and the third power unit is a current-sinking power chip; the second power unit is configured with a positive terminal and a negative terminal, wherein the positive terminal of the second power unit serves as the current-pull terminal, and the negative terminal of the second power unit serves as the common potential terminal; the third power unit is configured with a positive terminal and a negative terminal, wherein the positive terminal of the third power unit serves as the current-sinking terminal, the negative terminal of the third power unit serves as the auxiliary terminal, and the target potential terminal serves as the common potential terminal; The power module also includes a fourth power unit, which is a power management chip. The power module also includes a first circuit board, on which the second power unit, the third power unit and the fourth power unit are integrated. The first circuit board is a timing control circuit board, which synchronously supplies power to the second power unit, the third power unit and the fourth power unit through the voltage provided by the system board.

2. The power module according to claim 1, characterized in that, The fourth power supply unit is used to provide one or more of the following to the display panel containing the circuit to be driven: pull-up voltage, timing drive logic voltage, first reference voltage, and second reference voltage.

3. The power supply module according to claim 1, characterized in that, The power module also includes a first heat dissipation component disposed on the first circuit board.

4. A display panel, characterized in that, It includes a pixel circuit, a light-emitting device, and a power supply module as described in any one of claims 1-3; wherein the pixel circuit is connected to the anode of the light-emitting device, the current-pull terminal of the power supply module is connected to the first power supply terminal of the pixel circuit, and the current-sinking terminal of the power supply module is connected to the cathode of the light-emitting device.

5. The display panel according to claim 4, characterized in that, All transistors in the pixel circuit are N-type transistors.

6. The display panel according to claim 5, characterized in that, Each transistor in the pixel circuit is an indium gallium zinc oxide transistor.

7. A display device, characterized in that, Includes the display panel as described in any one of claims 4-6.

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