Display module, electronic device, and display driving method

Abstract

This application provides a method for driving a display module, a display module, and an electrical device. The display module includes an OLED panel, a connecting plate, and a display driver integrated circuit; the OLED panel includes a plurality of pixels, each pixel including at least one BSM; the method includes: providing a first voltage to the BSM when the OLED panel is displayed at a first brightness level, or providing a second voltage to the BSM when the OLED panel is displayed at a second brightness level; wherein the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage. Through the driving method and the display module, a balance between display effect and power consumption can be achieved in different display modes. For example, lower power consumption can be achieved in high brightness mode, and improved MURA can be achieved in low grayscale display mode.

Description

Technical Field

[0001] This application relates to the field of terminal technology, and in particular to a display module, an electronic device, and a display driving method. Background Technology

[0002] The display is the entry point for human-computer interaction, especially for portable devices such as mobile phones or tablets, where it is one of the most power-consuming structures. How images or videos are rendered also depends on the display.

[0003] Recently, organic light-emitting diodes (OLEDs) have been widely used in portable devices. To some extent, power consumption and display quality have always been two conflicting aspects of OLED displays. Finding a better balance between these two aspects is becoming increasingly important. Summary of the Invention

[0004] This application provides a display module, an electronic device, and a display driving method. Different voltages can be supplied to the bottom shield metal (BSM) of the display panel depending on the brightness level or display mode. Therefore, different benefits can be obtained; for example, lower power consumption for high brightness levels and improved MURA for low grayscale display modes.

[0005] A first aspect of this application provides a method for driving a display module, wherein the display module includes an organic light-emitting diode (OLED) panel, a connecting plate, and a display driver integrated circuit (DDIC); the OLED panel is electrically connected to the DDIC through the connecting plate; the OLED panel includes a plurality of pixels, each pixel including at least one BSM; the method includes: providing a first voltage to the BSM when the OLED panel is displayed at a first brightness level, or providing a second voltage to the BSM when the OLED panel is displayed at a second brightness level; wherein the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage.

[0006] In one embodiment of this application, the first voltage is positively biased relative to the average BSM voltage, and the second voltage is negatively biased relative to the average BSM voltage.

[0007] In one embodiment of this application, the first brightness level corresponds to the HDR display mode, and the second brightness level corresponds to the low grayscale display mode.

[0008] In conjunction with the first aspect, in one possible implementation of the first aspect, the method further includes: providing a third voltage to the BSM when the OLED panel is displayed at a third brightness level, wherein the third voltage is between the first voltage and the second voltage, and the third brightness level is between the first brightness level and the second brightness level.

[0009] In one embodiment of this application, the first brightness level can also be regarded as a bright mode, the second brightness level can also be regarded as a dark mode, and the third brightness level can also be regarded as a normal mode.

[0010] In one embodiment of this application, each pixel in the OLED panel has at least a DTFT made of LTPS TFT for driving the OLED device, the DTFT including a BSM under the channel.

[0011] In this technical solution, a larger voltage is supplied to the BSM when the OLED panel is displayed at a higher brightness level; conversely, a smaller voltage is supplied to the BSM when the OLED panel is displayed at a lower brightness level. A higher voltage results in a smaller subthreshold slope (SS), leading to a narrower data range or lower power consumption for the display module. Conversely, a lower voltage results in a larger SS, reducing the impact of voltage errors and improving MURA (Mutable Area Ratio). This technical solution achieves a balance between display performance and power consumption in different display modes.

[0012] In conjunction with the first aspect, in one possible implementation of the first aspect, the display module further includes at least a first voltage source and a second voltage source, wherein the first voltage source is used to provide the first voltage and the second voltage source is used to provide the second voltage.

[0013] In one embodiment of this application, three or more different voltage sources are included in the display device.

[0014] In one embodiment of this application, the first voltage source and the second voltage source are the same, that is, the adjustable voltage is included in the display device.

[0015] In conjunction with the first aspect, in one possible implementation of the first aspect, the method further includes: receiving a first control signal when the OLED panel is displayed at the first brightness level, wherein the first control signal is used to trigger the provision of the first voltage; or receiving a second control signal when the OLED panel is displayed at the second brightness level, wherein the second control signal is used to trigger the provision of the second voltage.

[0016] In one embodiment of this application, the control signal is received by an OLED panel, a connecting plate, or a DDIC.

[0017] In one embodiment of this application, the control signal may also be named a trigger signal. It should be understood that different electronic components may have different control methods; therefore, the first control signal or the second control signal may have different meanings for different electronic components. For example, for a switching TFT, the first control signal is the signal of the TFT's gate.

[0018] By receiving control signals, the display module can issue an alarm based on the voltage supplied to the BSM. This technical solution provides a more specific method for driving the display module.

[0019] In conjunction with the first aspect, in one possible implementation of the first aspect, the OLED panel includes at least a first switching TFT and a second switching TFT, wherein the first switching TFT is electrically connected to the BSM and the first voltage source, and the second switching TFT is electrically connected to the BSM and the second voltage source; receiving the first control signal when the OLED panel is displayed at the first brightness level further includes: the gate of the first switching TFT receiving the first control signal; or receiving the second control signal when the OLED panel is displayed at the second brightness level further includes: the gate of the second switching TFT receiving the second control signal.

[0020] In one embodiment of this application, the drain electrode and source electrode of the first switching TFT are electrically connected to the BSM or a first voltage source, respectively. The drain electrode and source electrode of the second switching TFT are electrically connected to the BSM or a second voltage source, respectively.

[0021] This technical solution provides an improved OLED panel with at least two switching TFTs. Even if one switching TFT fails, the other switching TFTs will not be affected. In other words, no single operating structure of the different display modes is coupled to the operating structures of other display modes. Providing different voltages to the BSM through different switching TFTs is a more stable driving method.

[0022] In conjunction with the first aspect, in one possible implementation of the first aspect, both the first voltage source and the second voltage source are included in the DDIC, and the method further includes: generating the first voltage when the first control signal is received by the DDIC, or generating the second voltage when the second control signal is received by the DDIC.

[0023] DDICs are commonly used to drive OLED panels. By improving the structure of DDICs, this driving method is easier to implement and applicable to existing OLED panels or existing interconnects.

[0024] In conjunction with the first aspect, in one possible implementation of the first aspect, a built-in power supply circuit is included in the DDIC, and the first voltage source and the second voltage source are included in the built-in power supply circuit.

[0025] Typically, the built-in power supply circuitry in a DDIC is used to generate various voltages from an external power source. Therefore, configuring two additional voltage sources within the built-in power supply circuitry is easier to implement and may have less impact on other circuits.

[0026] In conjunction with the first aspect, in one possible implementation of the first aspect, the built-in power supply circuit further includes at least a first switch and a second switch, wherein the first switch is electrically connected to the BSM and the first voltage source, and the second switch is electrically connected to the BSM and the second voltage source, wherein generating the first voltage when the first control signal is received by the DDIC further includes: turning on the first switch when the first control signal is received by the DDIC; generating the second voltage when the second control signal is received by the DDIC further includes: turning on the second switch when the second control signal is received by the DDIC.

[0027] In one embodiment of this application, both the first switch and the second switch are single-pole single-throw switches.

[0028] Even if one switch fails, it will not affect the other switches. In other words, the operating structure of each display mode is not coupled with the operating structure of other display modes. Providing different voltages to the BSM through different switches is a more stable driving method.

[0029] In conjunction with the first aspect, in one possible implementation of the first aspect, an adjustable level converter and a built-in power supply circuit are included in the DDIC. Generating the first voltage when the first control signal is received by the DDIC further includes: when the first control signal is received by the DDIC, the adjustable level converter adjusts the primary voltage to the first voltage, wherein the primary voltage is generated by the built-in power supply circuit. Generating the second voltage when the second control signal is received by the DDIC further includes: when the second control signal is received by the DDIC, the adjustable level converter adjusts the primary voltage to the second voltage, wherein the primary voltage is generated by the built-in power supply circuit.

[0030] Typically, level shifters in a DDIC are used to convert voltage levels. Configuring an adjustable level shifter to generate different voltages for the BSM is another, easier-to-implement driving method. Compared to configuring at least two additional switches in the built-in power supply circuitry, this approach offers better space utilization to some extent.

[0031] In conjunction with the first aspect, in one possible implementation of the first aspect, the method further includes: generating the first voltage when the first control signal is received by the connection board; or generating the second voltage when the second control signal is received by the connection board.

[0032] In one embodiment of this application, the connecting plate is a flexible printed integrated circuit.

[0033] This technical solution provides an alternative driving method by improving the structure of the connecting plate. This solution requires an improved connecting plate structure. Therefore, this driving method may have better compatibility with existing OLED panels and existing DDICs.

[0034] In conjunction with the first aspect, in one possible implementation of the first aspect, an adjustable voltage source is included in the connection board, and generating the first voltage when the first control signal is received by the connection board further includes: generating the first voltage based on a reference voltage according to the first control signal; or generating the second voltage when the second control signal is received by the connection board further includes: generating the second voltage based on a reference voltage according to the second control signal.

[0035] Configuring an adjustable voltage source to generate different voltages for the BSM is another easier driving method that has less impact on other parts of the display module.

[0036] In conjunction with the first aspect, in one possible implementation of the first aspect, before generating the first voltage based on the reference voltage according to the first control signal, the method further includes: receiving the first control signal and the reference voltage from the DDIC; or before generating the second voltage based on the reference voltage according to the second control signal, the method further includes: receiving the second signal and the reference voltage from the DDIC.

[0037] In one embodiment of this application, the reference voltage may be sent by other devices such as a power management integrated circuit (PMIC).

[0038] In one embodiment of this application, the trigger signal may also be provided by other devices such as an application processor.

[0039] By receiving different trigger signals, the adjustable voltage source can generate different voltages. This technical solution provides a more specific method for driving the display module through a control connection board.

[0040] In one embodiment of this application, a display module and a PMIC are configured in a user equipment, wherein, before generating the first voltage based on a reference voltage according to the first control signal, the method further includes: receiving the first control signal from the DDIC and receiving the reference voltage from the PMIC; and before generating the second voltage based on the reference voltage according to the second control signal, the method further includes: receiving the second control signal from the DDIC and receiving the reference voltage from the PMIC.

[0041] According to a second aspect, a display module is provided, comprising: an organic light-emitting diode (OLED) panel, a connecting plate, and a display driver integrated circuit (DDIC), wherein the OLED panel is electrically connected to the DDIC via the connecting plate; the OLED panel includes a plurality of pixels, each pixel in the OLED panel including at least one bottom shield metal (BSM); wherein, when the OLED panel is displayed at a first brightness level, the display module is used to provide a first voltage to the BSM, and when the OLED panel is displayed at a second brightness level, the display module is used to provide a second voltage to the BSM, wherein the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage.

[0042] In one embodiment of this application, the first voltage is positively biased relative to the average BSM voltage, and the second voltage is negatively biased relative to the average BSM voltage.

[0043] In one embodiment of this application, the first brightness level corresponds to the HDR display mode, and the second brightness level corresponds to the low grayscale display mode.

[0044] Typically, each pixel in an OLED panel has at least a DTFT made of LTPS TFT for driving the OLED device, which includes a BSM below the channel.

[0045] In this technical solution, a larger voltage is supplied to the BSM when the OLED panel is displayed at a higher brightness level; conversely, a smaller voltage is supplied to the BSM when the OLED panel is displayed at a lower brightness level. A higher voltage results in a smaller SS (short-range signal), thus narrowing the data range of the display module or reducing power consumption. Conversely, a lower voltage results in a larger SS, reducing the impact of voltage errors and improving MURA (Mullage Range and Power Consumption). This technical solution achieves a balance between display performance and power consumption in different display modes.

[0046] In conjunction with the second aspect, in one possible implementation of the second aspect, the display module includes at least a first voltage source and a second voltage source, wherein the first voltage source is used to provide the first voltage and the second voltage source is used to provide the second voltage.

[0047] In one embodiment of this application, three or more different voltage sources are included in the display module.

[0048] In one embodiment of this application, the first voltage source and the second voltage source are the same, that is, the adjustable voltage is included in the display module.

[0049] In conjunction with the second aspect, in one possible implementation of the second aspect, the OLED panel includes at least a first switching TFT and a second switching TFT, wherein the first switching TFT is electrically connected to the BSM and the first voltage source, and the second switching TFT is electrically connected to the BSM and the second voltage source; when a first control signal is received by the gate of the first switching TFT, the BSM is turned on by the first voltage source; when a second control signal is received by the gate of the second switching TFT, the BSM is turned on by the second voltage source.

[0050] In one embodiment of this application, the drain electrode and source electrode of the first switching TFT are electrically connected to the BSM or a first voltage source, respectively. The drain electrode and source electrode of the second switching TFT are electrically connected to the BSM or a second voltage source, respectively.

[0051] This technical solution provides an improved OLED panel with at least two switching TFTs. Even if one switching TFT fails to operate, the other switching TFTs will not be affected. In other words, no single operating structure of the different display modes is coupled to the operating structures of other display modes.

[0052] In conjunction with the second aspect, in one possible implementation of the second aspect, the DDIC includes a built-in power supply circuit, which includes the first voltage source and the second voltage source.

[0053] Typically, the built-in power supply circuitry in a DDIC is used to generate various voltages from an external power source. Therefore, configuring two additional voltage sources within the built-in power supply circuitry is easier to implement and may have less impact on other circuits.

[0054] In conjunction with the second aspect, in one possible implementation of the second aspect, the built-in power supply circuit further includes at least a first switch and a second switch, the first switch being electrically connected to the BSM and the first voltage source, and the second switch being electrically connected to the BSM and the second voltage source.

[0055] In one embodiment of this application, both the first switch and the second switch are single-pole single-throw switches.

[0056] Even if one switch fails, it will not affect the other switches. In other words, the operating structure of each display mode is not coupled with the operating structure of other display modes.

[0057] In conjunction with the second aspect, in one possible implementation of the second aspect, the DDIC includes an adjustable level converter and a built-in power supply circuit, the adjustable level converter being used to adjust the primary voltage to the first voltage or the second voltage, and the built-in power supply being used to generate the primary voltage.

[0058] Typically, level shifters in a DDIC are used to convert voltage levels. Configuring an adjustable level shifter to generate different voltages for the BSM is another, easier-to-implement driving method. Compared to configuring at least two additional switches in the built-in power supply circuitry, this approach offers better space utilization to some extent.

[0059] In conjunction with the second aspect, in one possible implementation of the second aspect, the connection board includes an adjustable voltage source, the DDIC is used to generate the reference voltage and a first control signal or a second control signal, and the adjustable voltage source is used to generate the first voltage or the second voltage based on the reference voltage according to the first control signal or the second control signal, respectively.

[0060] In one embodiment of this application, the connecting plate is a flexible printed integrated circuit.

[0061] This technical solution provides an alternative driving method by improving the structure of the connecting plate. This solution requires changing the structure of the connecting plate. Therefore, this driving method may have better compatibility with existing OLED panels and existing DDICs.

[0062] According to a third aspect, an electrical device is provided, comprising: a processor and a display module as described in the second aspect or any possible design of the second aspect of the present application; wherein the processor is configured to send control signals to the display module, and the display module is configured to receive the control signals and display according to the control signals.

[0063] The processor is used to send control signals to the display module.

[0064] In conjunction with the third aspect, in one possible implementation of the third aspect, the processor is further configured to send a first control signal to the DDIC of the display module when the OLED panel of the display module is displayed at the first brightness level, wherein the first control signal is used to trigger the provision of the first voltage; or to send a second control signal to the DDIC of the display module when the OLED panel of the display module is displayed at the second brightness level, wherein the second control signal is used to trigger the provision of the second voltage; wherein the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage. Attached Figure Description

[0065] Figure 1 A schematic diagram of the electrical equipment provided in this application is shown.

[0066] Figure 2 A schematic diagram of the display module provided in this application is shown.

[0067] Figure 3 A schematic diagram of the OLED display panel structure is shown.

[0068] Figure 4 This is a top view of the DTFT provided in this application.

[0069] Figure 5 yes Figure 4 The cross-sectional view of the DTFT shown.

[0070] Figure 6 A schematic diagram of another OLED display panel structure is shown.

[0071] Figure 7 A schematic diagram of the power management section at the DDIC is shown.

[0072] Figure 8 A schematic diagram of the built-in power supply circuit at the DDIC is shown.

[0073] Figure 9 A schematic diagram of another power management section at the DDIC is shown.

[0074] Figure 10 A schematic diagram of the FPC provided in this application is shown.

[0075] Figure 11 A schematic diagram of another FPC provided in this application is shown.

[0076] Figure 12 A flowchart of the method for driving a display module provided in this application is shown.

[0077] Figure 13 The graph shows the voltage variation of the BSM under different signals.

[0078] Figure 14 The graphs of drain-source current versus gate-source voltage before and after applying a negative bias to the BSM are shown.

[0079] Figure 15 The image of MURA is shown before a negative bias is applied to the BSM.

[0080] Figure 16 The image of MURA is shown after applying a negative bias to the BSM.

[0081] Figure 17 The graphs of drain-source current versus gate-source voltage are shown before and after applying a positive bias to the BSM.

[0082] Figure 18 The graph shows the voltage of SS versus BSM.

[0083] Figure 19 A graph showing the data range versus BSM voltage is presented.

[0084] Figure 20 A schematic diagram of the electrical equipment provided in this application is shown. Detailed Implementation

[0085] To make the objectives, technical details, and advantages of the embodiments of this application apparent, the technical solutions of the embodiments of this application will be described in a clear and fully understandable manner in conjunction with the accompanying drawings related to the embodiments of this application. Obviously, the described embodiments are merely some embodiments of this application and not all embodiments. Based on the embodiments described herein, those skilled in the art can obtain other embodiments without any creative work, and these embodiments should be within the scope of this application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those known to one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” etc., used in the description and claims of this application are not intended to indicate any order, quantity, or importance, but are used to distinguish various components. Furthermore, the terms “an,” “the,” or “the” are not intended to limit the quantity, but rather to indicate the presence of at least one. The terms “comprising,” “including,” etc., are intended to specify that elements or objects stated before these terms include elements or objects listed after these terms and their equivalents, but do not exclude other elements or objects. The phrases “connected,” “linked,” etc., are not intended to define a physical or mechanical connection, but may directly or indirectly include an electrical connection. “On,” “under,” “right,” “left,” etc., are used to indicate relative positional relationships, which may change as the position of the described object changes.

[0087] The maximum brightness of a display affects its display quality. Generally, the higher the maximum brightness a display can achieve, the better the display effect. Higher brightness also means higher power consumption. Furthermore, different content requires different brightness levels; in other words, not everything displayed on the screen needs the same high brightness.

[0088] In order to achieve better display effects based on the displayed content and to maintain a balance between display effects and power consumption and other aspects, this application discloses a display module and a driving method for the display module.

[0089] Before introducing specific embodiments, some key terms used in this application will be explained as follows.

[0090] An organic light-emitting diode (OLED), also known as an organic electroluminescent (organic EL) diode, is a type of light-emitting diode (LED) in which the emitting electroluminescent layer is a thin film of organic compound that emits light in response to an electric current. This organic layer is located between two electrodes; typically, at least one of these electrodes is transparent.

[0091] Low-temperature polycrystalline silicon (LTPS) refers to polycrystalline silicon synthesized at relatively lower temperatures (around 650°C and lower) compared to conventional methods (above 900°C). LTPS is important for the display industry because using large glass panels prevents deformation caused by exposure to high temperatures. More specifically, the use of polycrystalline silicon in thin-film transistors (LTPS-TFTs) has enormous potential for the mass production of electronic devices such as flat-panel LCD displays or image sensors.

[0092] A field-effect transistor (FET) is a transistor that uses an electric field to control the flow of current in a semiconductor. An FET has three terminals: source, gate, and drain. By applying a voltage to the gate, the FET controls the current flow, thereby altering the conductivity between the drain and source.

[0093] A thin-film transistor (TFT) is a special type of field-effect transistor (FET) in which the transistor is fabricated through thin-film deposition. TFTs are grown on a supporting (but non-conductive) substrate. A common substrate is glass, as TFTs are traditionally used in liquid crystal displays (LCDs). This differs from traditional bulk metal-oxide-semiconductor (MOSFETs), whose semiconductor material is typically a substrate, such as a silicon wafer.

[0094] The subthreshold slope (SS), also known as the subthreshold swing, is a characteristic of the current-voltage properties of a MOSFET. In the subthreshold region, the drain current behavior (although controlled by the gate terminal) is similar to the exponentially decreasing current of a forward-biased diode. Therefore, in this MOSFET operating state, the drain current versus gate voltage curve, along with the fixed body voltage, will exhibit approximately logarithmic linear behavior. Its slope is the subthreshold slope.

[0095] MURA is a Japanese word meaning "uneven; irregular; lacking uniformity; non-uniform; uneven," and it is a key concept in the Toyota Production System (TPS). It is one of the three types of waste (muda, mura, muri).

[0096] Grayscale, also known as gray levels, is a type of image in digital photography, computer-generated images, and colorimetry where each pixel's value is a single sample representing the amount of light; that is, it carries intensity information. A grayscale image is a monochrome image consisting entirely of shades of gray, either black or white. The contrast ranges from the weakest black to the strongest white.

[0097] Figure 1 This is a possible schematic structural diagram of a mobile phone with a display module. It should be understood that the mobile phone 10 shown in the figure is merely an example of an electronic device, and the mobile phone 10 may have more or fewer components than shown in the figure, may combine two or more components, or may have different component configurations. The various components shown in the figure can be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application-specific integrated circuits.

[0098] The processor 11 is the control center of the mobile phone 10. The processor 11 is connected to various parts of the mobile phone 10 through various interfaces and cables, runs or executes applications stored in the memory 12, and calls data and instructions stored in the memory 12 to perform various functions of the mobile phone 10 and process data.

[0099] The memory 12 is used to store applications and data. The memory 12 includes a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function (e.g., sound playback and image playback). The data storage area may store data generated based on the use of the mobile phone 10 (e.g., audio data and phonebook).

[0100] The display module (also known as the display device) 1000 can be used to display information input by the user or information provided to the user, as well as various graphical user interfaces (GUIs).

[0101] The display controller 14 is a control component within the control assembly of the display device 15. The display controller 14 receives signals from the processor 11 and sends drive signals and data to the display device 15 in the form of electrical signals. By controlling screen brightness and color, image information such as letters and pictures can be displayed on the screen. In one embodiment of this application, the display controller 14 is a display driver integrated circuit (DDIC).

[0102] Display device 15 is responsible for displaying images. The function of display device 15 is to receive drive signals and data in the form of electrical signals from display controller 14. In one embodiment of this application, display device 15 is a display panel.

[0103] In one embodiment of this application, processor 11 processes instructions and sends digital signals to display controller 14. Display controller 14 converts these digital signals into analog signals and drives display device 15. Display device 15 then displays an image based on the received signals.

[0104] Figure 2 An embodiment of a display module 1000 is shown. The display module 1000 consists of a display panel 100, a DDIC 200, and a connecting plate 300. The display panel 100 is electrically connected to the DDIC 200 via the connecting plate 300, and the DDIC 200 is used to drive the display panel 100. In some scenarios, the display panel 100 may also be referred to as a display device 100.

[0105] In one embodiment of this application, the display panel 100 is an OLED panel, including an active area (AA) 110, a sealing area, and a pad area. AA 110 is an effective area for compositing images or an area that actively addresses and emits light. AA 110 consists of a large number of pixels aligned in a matrix. Typically, a pixel consists of a red sub-pixel, a green sub-pixel, and a blue sub-pixel. Subpixels are also called dots. In one embodiment of this application, each subpixel has at least a driving TFT (DTFT) and an OLED device. The sealing area is configured between the edge of AA 110 and the pad area to seal AA 110. AA 110 is electrically connected to an integrated circuit via the pad area. Typically, different connection methods are used for AA 110 of different sizes. Chip-on-film (COF), chip-on-glass (COG), and film-on-glass (FOG) are three of the most commonly used methods.

[0106] In this embodiment, the display panel 100 may have different structures. Figures 3 to 6 Two implementation examples are provided. Figure 3 The diagram provides the structure of a first OLED panel 100A, which can be considered as an enlarged view of region A1 in the OLED panel 100. The OLED panel 100A is made of a TFT backplane and an OLED frontplane. In one embodiment of this application, each pixel includes at least one DTFT.

[0107] The DTFT is used to drive the OLED panel. In one embodiment of this application, the DTFT can be made of LTPS TFT. The DTFT acts as a FET, so the current through the OLED panel is controlled by the DTFT.

[0108] DTFTs have a top gate electrode on a channel made of polycrystalline silicon, and a metal electrode underneath the channel to cover it. This metal electrode under the channel can be called bottom-shield metal (BSM). Traditionally, BSMs are used to shield the migration of charged particles within the substrate of OLED panels 100A.

[0109] Simplified DTFT structure as follows Figure 4 and Figure 5 As shown, Figure 4 A top view of the DTFT is shown. Figure 5 A cross-sectional view of the DTFT is shown. The DTFT includes a source electrode, a drain electrode, multiple highly doped regions (n+), multiple lightly doped drains (LDDs), a channel layer 21, a top gate electrode 22, and a BSM 103. (Combined with...) Figure 4 and Figure 5 BSM 103 is located below the channel layer 21 and above the channel region.

[0110] Return to reference Figure 4 Multiple BSMs are configured in each pixel, and BSM 103 is the BSM below sub-pixel 104. The BSMs in each pixel are connected to a horizontal line 101 or a vertical line 102 at AA 110 via electrodes of a certain width. In one embodiment of this application, these lines are joined together at the edge of AA 110. In other cases, these lines are joined together at AA 110 in a vertical or horizontal direction, forming a matrix shape. At least one connecting portion 105 is provided near the edge of the connecting plate 300 for connecting the connecting plate 300.

[0111] Figure 6 Another embodiment of the OLED panel 100B is shown. Compared to the first OLED panel 100A, this OLED panel 100B (or the second OLED panel 100B) includes at least two additional switching TFTs (first TFT 106A and second TFT 106B) and at least two additional connectors (first connector 107A and second connector 107B). The first switching TFT 106A is electrically connected to the first connector 107A, and the second switching TFT 106B is electrically connected to the second connector 107B. More specifically, a first end of each switching TFT is connected to a connector, and a second end of the switching TFT is connected to a connection portion 105 at the edge of the OLED panel 100B. Here, one of the first and second ends of the switching TFT is a source electrode, and the other is a drain electrode. In one embodiment of this application, the first connector 107A and the second connector 107B are electrically connected to two different voltage sources, respectively.

[0112] In one embodiment of this application, when the voltage of the gate electrode (such as the first gate electrode 106A or the second gate electrode 106B) reaches a threshold, the first and second terminals of the switching TFT are interconnected, causing the connection portion 105 to be connected to the additional connector. For example, when a signal named SELB is received in the first gate 106A, a first voltage is applied to the BSM through the first connector 107A. When a second signal named SELN is received in the second gate electrode 106B, a second voltage is applied to the BSM through the second connector 107B.

[0113] In one embodiment of this application, the first voltage and the second voltage correspond to two different brightness levels or two different display modes. For example, the first voltage is associated with a higher brightness level, and the second voltage is associated with a lower brightness level.

[0114] In one embodiment of this application, two or more additional switching TFTs and two or more additional connectors are configured in an OLED panel. The connection method of these multiple switching TFTs and connectors can be referred to the above description. Figure 6 The description.

[0115] When two or more additional switching TFTs and two or more additional connectors are configured in an OLED panel, at least three different voltages can be applied to the BSM. The OLED panel can display in at least three different modes or brightness levels.

[0116] The function of the DDIC 200 in the display module 10 is to control the OLED panel 100. For example, the DDIC 200 can be used to provide the voltage for the data lines, the signals for the gate drive circuit, and the power supply voltage required to drive the DTFT and OLED devices. Traditionally, the DDIC includes a power management section, a timing controller, data driver outputs, and an interface.

[0117] Figure 7 An embodiment of the power management section 210A (or first power management section 210A) in the first DDIC is shown. In one embodiment of this application, the first power management section 210A includes a built-in power circuit 211 and a level converter 212. The level converter 212 is also referred to as a voltage level converter 212. The built-in power circuit 211 is used to generate various voltages as power sources using power from an external power source 201. A first portion 202A of the generated voltage is directly provided as a voltage source for the OLED panel 100. A second portion 202B of the generated voltage is sent to the level converter 212, whose level is converted to voltage 203, and then provided as a voltage source for the OLED panel 100.

[0118] Different types of built-in power supply circuits can be applied in the first power management section 210A of the first DDIC provided in this embodiment.

[0119] In some embodiments, a first built-in power supply circuit is configured in the DDIC 200. This first built-in power supply circuit is a DC-DC converter that uses capacitors as energy storage chargers to boost or reduce voltage. In some scenarios, the first built-in power supply circuit is also referred to as a charge pump circuit.

[0120] In one embodiment of this application, a second built-in power supply circuit 211A is provided, which is based on the first built-in power supply circuit. At least two additional switches and at least two additional power supplies are included in the second built-in power supply circuit 211A to provide switching voltages. In one embodiment of this application, the additional switches are single-pole single-throw switches.

[0121] Figure 8 An embodiment of the second built-in power supply circuit 211A is shown. A first power supply 213A and a second power supply 213B are disposed in the second built-in power supply circuit 211A, and the output of the DDIC 200 is selected from these two power supplies by a first switch 214A and a second switch 214B in the second built-in power supply circuit 211A. Specifically, if the first switch 214A is open, a first voltage is output from the DDIC 200 and supplied to the OLED panel. If the second switch 214B is open, a second voltage is output from the DDIC 200 and supplied to the OLED panel.

[0122] In one embodiment of this application, the first power supply 213A and the second power supply 213B correspond to two different display modes or brightness levels. Therefore, the first voltage and the second voltage output from the first power supply 213A and the second power supply 213B correspond to two different display modes or brightness levels. For example, the first power supply 213A is a voltage source associated with a higher brightness level, and the second power supply 213B is a voltage source associated with a lower brightness level. As another example, the first power supply 213A is a voltage source associated with a high dynamic range (HDR) display mode, and the second power supply 213B is a voltage source associated with a low grayscale display mode.

[0123] In one embodiment of this application, a third built-in power supply circuit is provided, similar to the second built-in power supply circuit 211A, including two or more additional switches and two or more additional power supplies. Through the fifth built-in power supply circuit configured in the DDIC 200, at least three different voltages can be provided to the OLED panel. The OLED panel can have at least three different display modes. The operating principle of the fifth built-in power supply circuit can refer to the operating principle of the second built-in power supply circuit 211A described above.

[0124] Figure 9 Another embodiment of a power management section 210B (or second power management section 210B) for providing a switching signal at the second DDIC is shown. Here, an adjustable level converter 220 is configured in the second power management section 210B. In this configuration, a built-in power supply circuit 211 provides at least one voltage level via an external power supply 201, and the adjustable level converter 220 is used to change the voltage level received from the built-in power supply circuit 211. Different adjusted voltages (V1, V2, etc.) are output from the adjustable level converter 220 and provided to the OLED panel. In one embodiment of this application, these different adjusted voltages correspond to different display modes or brightness levels. For example, adjusted voltage V1 corresponds to a higher brightness level display mode, and adjusted voltage V2 corresponds to a low grayscale display mode.

[0125] In one embodiment of this application, the connecting plate 300 for connecting the OLED panel 100 and the DDIC 200 is a printed circuit board, such as a flexible printed circuit (FPC) including at least one copper film layer.

[0126] Figure 10 An embodiment of a connecting plate 300A (or a first connecting plate 300A) or a first FPC 300A is shown. The first FPC 300A includes a first connecting terminal 301, a second connecting terminal 302, and a plurality of interconnecting lines 303. Both the first connecting terminal 301 and the second connecting terminal 302 include a plurality of contacts. The contacts in the first connecting terminal 301 and the contacts in the second connecting terminal 302 are connected by the interconnecting lines 303. In one embodiment of this application, the number of contacts in the first connecting terminal 301 and the second connecting terminal 302 is different. In one embodiment of this application, the first connecting terminal 301 is used to contact the OLED panel 100, and the second connecting terminal 302 is used to contact the DDIC 200.

[0127] Second connecting plate 300B or FPC 300B, such as Figure 11 As shown, compared to the first connection board 300A, the adjustable voltage source 310 is configured in the second connection board 300B. The adjustable voltage source 310 includes an input terminal and an output terminal. Both a trigger signal and a reference voltage are transmitted to the input terminal, and at least two different target voltages are generated by the adjustable voltage source 310 using the reference voltage based on different trigger signals. In one embodiment of this application, the adjustable voltage source 310 is fixed on the second FPC 300B using surface mounting technology (SMT).

[0128] In one embodiment of this application, at least two additional interconnects are connected between the output terminal of the adjustable voltage source 310 and the first connection terminal 301 for transmitting different target voltages to the OLED panel 100. At least two other additional interconnects are connected between the input terminal of the adjustable voltage source 310 and the second connection terminal 302 for receiving a reference voltage and a trigger signal, respectively. In these cases, additional contacts can be configured in either the first connection terminal 301 or the second connection terminal 302. For example, two additional contacts are configured in the first connection terminal 301, and the other two additional contacts are configured in the second connection terminal 302.

[0129] Alternatively, the trigger signal can be provided by the application processor, and the reference voltage can be provided by the power management integrated circuit (PMIC).

[0130] In one embodiment of this application, different trigger signals correspond to different display modes or brightness levels of the OLED display, and therefore different target voltages also correspond to the display modes or brightness levels of the OLED display. For example, when the OLED display is displayed in dark mode or at a low brightness level, a first trigger signal is provided by the DDIC 200 to the adjustable voltage source 310. Then, a first target voltage is generated by the adjustable voltage source 310 according to the first trigger signal and transmitted to the OLED panel 100. When the OLED display is displayed at a high brightness level or in HDR mode, a second trigger signal is provided by the DDIC 200 to the adjustable voltage source 310. Then, a second target voltage can be generated by the adjustable voltage source 310 according to the second trigger signal and transmitted to the OLED panel 100.

[0131] In one embodiment of this application, at least three different target voltages can be generated by an adjustable voltage source 310 based on a reference voltage according to at least three different trigger signals, these different trigger signals corresponding to at least three different display modes or brightness levels of the OLED display. The structure of this type of connector 300 is similar to... Figure 11 The structure shown.

[0132] Based on the display module structure provided above, Figure 12 Several driving methods for display modules are provided below. Depending on the content displayed on the display module, different voltages can be supplied to the BSM of the OLED panel.

[0133] S101, Determine the brightness level of the display module.

[0134] In one embodiment of this application, an electrical device includes a display module and a processor, the processor being electrically connected to the display module. The brightness level or display mode is determined by the processor of the electrical device. The processor may be a host processor, a microcontroller (MCU), or an application processor.

[0135] Typically, maximum brightness can be used as the monitor's brightness level. In some scenarios, the brightness level can also be replaced by the display mode. There are several ways to define the maximum brightness of a display module, such as the content displayed on the display module, automatic brightness control based on ambient light intensity, the user's preferred brightness setting, and the user-selected appearance mode. The monitor's brightness level is determined when the maximum illuminance of the display module changes.

[0136] In one embodiment of this application, the brightness level of the display is determined when the content of the display changes from a first type of content to a second type of content, and the highest illuminance in the first type of content differs from that in the second type of content. The first type of content or the second type of content can be an image, an HDR video, or an application interface, etc.

[0137] It is understandable that different display content corresponds to different brightness levels in order to achieve a better display effect.

[0138] In one embodiment of this application, when the display mode of the monitor switches from a first mode to a second mode and the maximum illuminance of the first mode is different from that of the second mode, the brightness level of the monitor is determined. In one embodiment of this application, the first mode can be a bright mode or a dark mode, and the second mode can be another mode. In one embodiment of this application, the first mode can be a high display quality mode or a power-saving mode, and the second mode can be another mode. In one embodiment of this application, the first mode can be a high resolution mode or a low resolution mode, and the second mode can be another mode.

[0139] In one embodiment of this application, the brightness level of the display is determined when a second preferred brightness is set according to a first preferred brightness of the display.

[0140] S102, change the BSM voltage according to the received signal related to the brightness level.

[0141] Traditionally, a processor electrically connected to the display module sends control signals to the display module's DDIC, and these control signals are altered when the brightness level of the display module changes.

[0142] In one embodiment of this application, the display module includes at least one OLED panel, which is composed of a large number of pixels. Each pixel in the OLED panel includes at least one DTFT. The BSM is a layer in the DTFT that can shield charged particles from migrating to the panel substrate.

[0143] In one embodiment of this application, at least two conductive switching TFTs are located between the OLED panel and the connecting plate. A first switching TFT is used to transmit a first voltage to the OLED panel by receiving a first signal. A second switching TFT is used to transmit a second voltage to the OLED panel by receiving a second signal. Here, the first voltage and the second voltage are different.

[0144] Here, both the first and second signals are generated by the DDIC. Specifically, when the first control signal is received by the DDIC, the first signal is generated by the DDIC; when the second control signal is received by the DDIC, the second signal is generated by the DDIC. In one embodiment of this application, the first control signal is associated with a higher brightness level, while the second control signal is associated with a lower brightness level. For example, the first control signal is generated when the display module is displayed in HBM or HDR mode, and the second control signal is generated when the display module is displayed in low grayscale mode. In other words, the first voltage corresponds to a higher brightness level, and the second voltage corresponds to a lower brightness level.

[0145] For example, when the display module is displayed in a normal mode related to a medium brightness level, a third control signal is received. This third signal is generated by the DDIC to set the third voltage of the BSM of the OLED panel.

[0146] In one embodiment of this application, at least two different signals can be output from the power management section of the DDIC.

[0147] In one embodiment of this application, the built-in power circuit of the power management section in the DDIC includes at least two switches. For example, a first switch is disposed between a first voltage source and the output terminal of the built-in power circuit, and a second switch is disposed between a second voltage source and the output terminal of the built-in power circuit. When the first switch is open, a first voltage is output from the output terminal of the built-in power circuit, generated from the first voltage source. When the second switch is open, a second voltage is output from the output terminal of the built-in power circuit from the second voltage source.

[0148] It should be understood that the built-in power supply section of the DDIC can include more than two switches, and each switch corresponds to a voltage to be supplied to the BSM of the OLED panel. In this way, more than two different voltages can be supplied to the BSM. The display module can display in more than two different modes, such as a normal mode with medium brightness, a dark mode with low brightness, and a bright mode with high brightness.

[0149] In one embodiment of this application, an adjustable level converter or voltage level converter is included in a power management section for converting a primary voltage generated from a built-in power supply circuit into at least two different secondary voltages. For example, a primary voltage supplied to the BSM in the OLED panel, and a secondary voltage supplied to the BSM in the OLED panel.

[0150] In one embodiment of this application, at least two different voltages are generated at a connection board including an adjustable voltage source, which may be an FPC or other printed circuit board. Both the trigger signal and the reference voltage are received by the adjustable voltage source, and the different target voltages are generated based on the reference voltage according to different trigger signals. For example, a first BSM voltage is generated upon receiving a first trigger signal, and a second BSM voltage is generated upon receiving a second trigger signal.

[0151] Figure 13 An example of BSM voltage variation caused by a first signal and a second signal is shown. During t1 to t2, the first signal is sent to the OLED display, and a first voltage is supplied to the BSM. During t3 to t4, the second signal is sent to the OLED display, and a second voltage is supplied to the BSM. The voltage supply time depends on the time the signal is supplied.

[0152] To further introduce the OLED display structure and its driving method, some working principles and technical advantages will be described below.

[0153] Typically, an internal compensation voltage is used to compensate for threshold voltage variations in a DTFT, but this compensation is not always perfect. One reason for imperfection is that the compensation operates under specific conditions, defined by specific gate voltages, specific drain currents, and specific compensation periods. Another reason is the limited compensation time, which makes the compensation imperfect and may introduce errors.

[0154] Taking the low grayscale area of ​​an OLED display as an example, under ideal conditions, the compensation scheme achieves the following relationship.

[0155] (1) Where Vgs is the gate-source voltage of the DTFT, Vth is the threshold voltage of the DTFT, Vdata is the write data voltage, and VDD is the positive power supply voltage. Since the compensation time may not be sufficient to achieve a fully charged and fully compensated state, a voltage error still exists. Equation (1) can be written in the following form: (2) Verror is the voltage error, which is related to at least one of the following parameters: the new write voltage (Vdata), the voltage at the node before the new write voltage (Vold), the threshold voltage (Vth), and the capacitance of the stored voltage (Cst) (indicating the charging capability of the DTFT, which depends on its width and charging time (t)).

[0156] Fluctuations in the Id-Vgs of the DTFT imply fluctuations in the (OLED current) – (data bias). In OLEDs, the relationship between current and illuminance is linear. Therefore, fluctuations in the (illuminance) – (data bias) can be viewed as MURA, meaning that fluctuations in the Id-Vgs of the DTFT can indicate MURA.

[0157] In the low grayscale region, the DTFT is in the subthreshold region, and its current I1 can be approximately represented by the following equation. (3) Wherein, SS is defined as per unit log 10 The maximum Vgs range of (Id). Vgs is related to the data bias (Vdata), so the larger SS is, the larger the data bias window is within the same current range.

[0158] According to equations (1) and (3), the effect of Verror on the current in the low grayscale region can be expressed by the following equation. (4) According to equation (4), Verror affects the current in low grayscale, just as it does the same portion of newly written data (Vdata). As Verror increases, the display's MURA becomes more pronounced. On the other hand, as SS increases, the effect of Verror on the current decreases. This means that a larger SS can improve the MURA caused by Verror in low grayscale areas.

[0159] Based on the Id-Vgs curve, if a negative bias is applied to the BSM under DTFT, the SS of the DTFT will increase. The gentler the slope of the Id-Vgs curve, the smaller the current change caused by the gate voltage. The smaller the change in DTFT current with data bias, the less sensitive the illuminance change is to the data bias. Therefore, MURA under low illuminance is improved.

[0160] It should be understood that negative bias refers to a voltage less than the average BSM voltage; in other words, the bias is based on the average BSM voltage. In short, the real voltage applied to the BSM associated with negative bias is less than the real voltage applied to the BSM associated with positive bias.

[0161] Figure 14 Two curves for SS are shown. Curve 901 indicates the relationship between Id and Vgs before applying a negative bias to the BSM of the OLED panel, and curve 902 indicates the relationship between Id and Vgs after applying a negative bias to the BSM. It can be observed that curve 902 is flatter than curve 901. In other words, in region C1, the absolute value of the slope of curve 901 is greater than the absolute value of the slope of curve 902.

[0162] Figure 15 and Figure 16 It shows the relationship with Figure 14 The MURA image related to the two curves mentioned in the text. Figure 15 The image of MURA before applying a negative bias to the BSM is shown, and Figure 15 The image shown is the MURA image after applying a negative bias to the BSM. As shown, with Figure 15 compared to, Figure 16 The display effect in different areas becomes more uniform, meaning that after applying a negative bias to the BSM, MURA is less noticeable.

[0163] Table 1 shows the changes in current and illuminance with Verror. To examine the effect of changing the SS value on MURA, the percentage effects of changes in OLED current, OLED illuminance, and Verror on the OLED current change were estimated, where Verror or ΔV (±5 mV) was applied. In this estimation, the OLED illuminance was set to 1 cd / m², and its OLED current was 31.25 picoamps / pixel. According to the data in Table 1, with an SS of 0.5, the illuminance change ranged from –2.3% to 2.3%, and the total range was 4.6%. With an SS of 0.65, the illuminance change ranged from –1.8% to 1.8%, and the total range was 3.6%. This means that by changing the SS from 0.5 to 0.65, the illuminance change could be improved by 1% (from 4.6% to 3.6%), or 21.7% of the illuminance change percentage.

[0164] Table 1. Variation of current and illuminance with Verror

[0165] Taking the HBM region of an OLED display as an example, if a positive bias is applied to the BSM under the DTFT, the SS of the DTFT will decrease. The slope of the Id-Vgs curve will be steeper. Therefore, the current will change more significantly with the gate voltage. The greater the change in DTFT current with data bias, the more sensitive the illuminance changes are to the data bias, and thus the data range of the HBM may decrease. Figure 16 Two curves are depicted: curve 901 indicates the relationship between Id and Vgs before a positive bias is applied to the BSM of the OLED panel, and curve 903 indicates the relationship between Id and Vgs after a positive bias is applied to the BSM. It can be observed that curve 903 is steeper than curve 901.

[0166] Figure 17 The data range of HBM before and after applying a positive bias to the BSM is also shown. The length of the first line segment L1 indicates the data range of the OLED display after applying a positive bias to the BSM, while the length of the second line segment L0 indicates the data range of the OLED display before applying a positive bias to the BSM. It can be observed that L1 is shorter than L0, meaning that the data range of the HBM mode narrows after applying a positive bias to the BSM.

[0167] Table 2 shows the different data ranges for different SS values. Typically, the data range is represented by a voltage range used to write data from dark to bright. In Table 2, I_oled1 indicates the DTFT current in dark display mode, and I_oled2 indicates the DTFT current in HBM display mode. Vgs1 and Vgs2 are the gate-source voltages of the DTFT, corresponding to I_oled1 and I_oled2, respectively. As shown in the figure, when SS decreases from 0.65 to 0.5, the parameter ΔV decreases from 1.104 to 0.849. The smaller the SS, the narrower the data range of the OLED display, and the lower the power consumption.

[0168] Table 2. Data range varies with SS

[0169] Figure 18 The effect of BSM voltage on SS is shown. Figure 19 The effect of BSM voltage on data range is shown. For example... Figure 18 As shown, within a specific range, SS changes linearly with the BSM voltage. Under normal circumstances, the voltage supplied to the BSM is within this finite range, therefore SS is directly proportional to the BSM voltage, with a negative coefficient. Thus, the greater the negative value of the applied BSM voltage, the larger the SS value may be obtained.

[0170] The data range in the low grayscale region varies linearly with the SS-BSM voltage. Conversely, in the high grayscale region, it is independent of SS. In the intermediate grayscale region, it is partially affected by SS. Due to this effect, the relationship between the absolute value of the HBM data range and the BSM voltage is as follows: Figure 18 As shown in the curve. In other words, if the applied BSM voltage is more positive, the absolute value of the HBM data range will be smaller.

[0171] See Figure 20 This diagram illustrates the structure of an electrical device 2000 provided in an embodiment of this application. The electrical device 2000 may be a smartphone, tablet computer, laptop computer, etc. The electrical device 2000 in this application may include one or more of the following components: (application) processor 2010, memory 2020, and display module 2030.

[0172] Processor 2010 may include one or more processing cores. Processor 2010 uses various interfaces and wiring to connect various parts of the electrical device 2000. Processor 2010 performs various functions of the electrical device 2000 and processes data by running or executing instructions, programs, code sets, or instruction sets stored in memory 2020. Optionally, processor 2010 may be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). Processor 2010 may integrate a central processing unit (CPU), a graphics processing unit (GPU), a neural network processing unit (NPU), a modem, etc. The CPU handles the operating system, user interface, and applications, etc. The GPU is responsible for rendering the content required by the display module 2030. The NPU is used for artificial intelligence (AI) functions. The modem is used for wireless communication. Understandably, these modems could also be implemented on a single chip, rather than integrated into the processor 2010.

[0173] The memory 2020 may include random access memory (RAM) or read-only memory (ROM). Optionally, the memory 2020 may include a non-transitory computer-readable storage medium. The memory 2020 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 2020 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system or instructions for at least one function. The data storage area may store data (e.g., audio data, telephone directories, etc.) created based on the use of the electrical device 2000.

[0174] Display module 1000 is a display unit for images, typically mounted on the front panel of electrical equipment 2000. Display module 1000 can be designed as a full-screen, curved screen, irregularly shaped screen, dual-sided screen, or foldable screen. Display module 1000 can also be designed as a combination of a full-screen and a curved screen, or a combination of an irregularly shaped screen and a curved screen; however, this embodiment does not define these combinations.

[0175] In this embodiment, the display module 1000 includes a DDIC 200 and a display panel 100. The display panel 100 may be an AMOLED display, an LTPS AMOLED display, or an LTPO AMOLED display.

[0176] The DDIC 200 is used to drive the display panel 100 to display images. The DDIC 200 is also used to control different voltage sources to provide different voltages to the BSM in the above embodiment. Furthermore, the DDIC 200 is connected to the processor 2010 and receives image data and instructions from the processor 2010.

[0177] In one possible implementation, the display module 100 also has a touch function, through which the user can perform touch operations using a finger, a stylus, or any suitable object on the display module 100.

[0178] Furthermore, those skilled in the art will understand that the structure of the electrical device 2000 shown in the above figures does not constitute a limitation on the electrical device 2000, and the electrical device 2000 may include more or fewer components, combinations of certain components, or different component arrangements than shown. For example, the electrical device 2000 may also include a microphone, speaker, input unit, sensor, audio circuitry, power supply, Bluetooth module, and other components.

[0179] The above descriptions are merely some specific implementations of this application and are not intended to limit the scope of protection of this application. Any variations or substitutions easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for driving a display module, characterized by, The display module includes an organic light-emitting diode (OLED) panel, a connecting plate, and a display driver integrated circuit (DDIC); the OLED panel is electrically connected to the DDIC through the connecting plate; the OLED panel includes multiple pixels, and each pixel includes at least one bottom shield metal (BSM). The method includes: When the OLED panel is displayed at a first brightness level, a first voltage is supplied to the BSM, or When the OLED panel is displayed at the second brightness level, a second voltage is provided to the BSM; Wherein, the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage.

2. The method according to claim 1, characterized in that, Also includes: When the OLED panel is displayed at the first brightness level, a first control signal is received, wherein the first control signal is used to trigger the provision of the first voltage; or When the OLED panel is displayed at the second brightness level, a second control signal is received, wherein the second control signal is used to trigger the provision of the second voltage.

3. The method according to claim 1 or 2, characterized in that, The display module further includes at least a first voltage source and a second voltage source, wherein the first voltage source is used to provide the first voltage and the second voltage source is used to provide the second voltage.

4. The method according to claim 3, characterized in that, The OLED panel includes at least a first switching thin-film transistor (TFT) and a second switching TFT, wherein the first switching TFT is electrically connected to the BSM and the first voltage source, and the second switching TFT is electrically connected to the BSM and the second voltage source. The step of receiving the first control signal when the OLED panel is displayed at the first brightness level further includes: The gate of the first switch TFT receives the first control signal; or The step of receiving the second control signal when the OLED panel is displayed at the second brightness level further includes: The gate of the second switch TFT receives the second control signal.

5. The method according to any one of claims 1 to 4, characterized in that, Both the first voltage source and the second voltage source are included in the DDIC, and the method further includes: When the first control signal is received by the DDIC, the first voltage is generated; or The second voltage is generated when the second control signal is received by the DDIC.

6. The method according to claim 5, characterized in that, The built-in power supply circuit is included in the DDIC, and the first voltage source and the second voltage source are included in the built-in power supply circuit.

7. The method according to claim 6, characterized in that, At least a first switch and a second switch are also included in the built-in power supply circuit, wherein the first switch is electrically connected to the BSM and the first voltage source, and the second switch is electrically connected to the BSM and the second voltage source. The step of generating the first voltage when the first control signal is received by the DDIC further includes: When the first control signal is received by the DDIC, the first switch is turned on; or The process of generating the second voltage when the second control signal is received by the DDIC further includes: When the second control signal is received by the DDIC, the second switch is turned on.

8. The method according to claim 4, characterized in that, An adjustable level shifter and a built-in power supply circuit are included in the DDIC. The step of generating the first voltage when the first control signal is received by the DDIC further includes: When the first control signal is received by the DDIC, the adjustable level converter adjusts the primary voltage to the first voltage, wherein the primary voltage is generated by the built-in power supply circuit; or The process of generating the second voltage when the second control signal is received by the DDIC further includes: When the second control signal is received by the DDIC, the adjustable level converter adjusts the primary voltage to the second voltage, wherein the primary voltage is generated by the built-in power supply circuit.

9. The method according to any one of claims 1 to 3, characterized in that, Also includes: When the first control signal is received by the connection board, the first voltage is generated; or When the second control signal is received by the connection board, the second voltage is generated.

10. The method according to claim 9, characterized in that, An adjustable voltage source is included in the connection plate. The step of generating the first voltage when the first control signal is received by the connection board further includes: The first voltage is generated based on the reference voltage according to the first control signal; or The step of generating the second voltage when the second control signal is received by the connection board further includes: The second voltage is generated based on the reference voltage according to the second control signal.

11. The method according to claim 10, characterized in that, Before generating the first voltage based on the reference voltage according to the first control signal, the method further includes: Receive the first control signal and the reference voltage from the DDIC; or Before generating the second voltage based on the reference voltage according to the second control signal, the method further includes: The second signal and the reference voltage are received from the DDIC.

12. A display module, characterized in that, include: An organic light-emitting diode (OLED) panel, a connecting plate, and a display driver integrated circuit (DDIC), wherein the OLED panel is electrically connected to the DDIC via the connecting plate; The OLED panel includes multiple pixels, and each pixel includes at least one bottom shield metal (BSM). Wherein, when the OLED panel is displayed at a first brightness level, the display module is used to provide a first voltage to the BSM, and when the OLED panel is displayed at a second brightness level, the display module is used to provide a second voltage to the BSM, wherein the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage.

13. The display device according to claim 12, characterized in that, The display module includes at least a first voltage source and a second voltage source, wherein the first voltage source is used to provide the first voltage and the second voltage source is used to provide the second voltage.

14. The display module according to claim 13, characterized in that, The OLED panel includes at least a first switching TFT and a second switching TFT, wherein the first switching TFT is electrically connected to the BSM and the first voltage source, and the second switching TFT is electrically connected to the BSM and the second voltage source; When the first control signal is received by the gate of the first switch TFT, the BSM is turned on by the first voltage source; when the second control signal is received by the gate of the second switch TFT, the BSM is turned on by the second voltage source.

15. The display module according to claim 13 or 14, characterized in that, The DDIC includes a built-in power supply circuit, which includes a first voltage source and a second voltage source.

16. The display module according to claim 15, characterized in that, The built-in power supply circuit also includes at least a first switch and a second switch, wherein the first switch is electrically connected to the BSM and the first voltage source, and the second switch is electrically connected to the BSM and the second voltage source.

17. The display module according to claim 12 or 14, characterized in that, The DDIC includes an adjustable level converter and a built-in power supply circuit. The adjustable level converter is used to adjust the primary voltage to the first voltage or the second voltage, and the built-in power supply circuit is used to generate the primary voltage.

18. The display module according to claim 12, characterized in that, The connection plate includes an adjustable voltage source. The DDIC is used to generate a reference voltage and a first control signal or a second control signal; The adjustable voltage source is used to generate the first voltage or the second voltage based on the reference voltage according to the first control signal or the second control signal, respectively.

19. An electronic device, characterized in that, include: Processor and display module according to any one of claims 12 to 18; The processor is used to send control signals to the display module, and the display module is used to receive the control signals and display according to the control signals.

20. The electronic device according to claim 19, characterized in that, The processor is also used for: When the OLED panel of the display module is displayed at the first brightness level, a first control signal is sent to the DDIC of the display module, wherein the first control signal is used to trigger the provision of the first voltage; or When the OLED panel of the display module is displayed at the second brightness level, a second control signal is sent to the DDIC of the display module, wherein the second control signal is used to trigger the provision of the second voltage; Wherein, the first brightness level is higher than the second brightness level, and the first voltage is greater than the second voltage.

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