Display module and its driving method, display device

Abstract

This application discloses a display module and its driving method and display device. The display module includes a display panel and multiple first power modules. The display panel includes a display area, which in turn includes multiple sub-areas. Each sub-area includes a sub-pixel, and each sub-pixel includes a first electrode, a light-emitting layer, and a second electrode. The second electrodes of different sub-areas are disconnected from each other. Different first power modules correspond to different sub-areas, and each first power module is electrically connected to the second electrode of its corresponding sub-area. According to embodiments of this application, under high load current, this method helps to reduce the temperature of the power modules.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display module and its driving method, and a display device. Background Technology

[0002] In medium and large-sized display products, the required load current is also larger, which increases the power supply current and causes the temperature of the power chip to rise. Summary of the Invention

[0003] This application provides a display module and its driving method and display device, which helps to reduce the temperature of the power module under high load current.

[0004] In a first aspect, embodiments of this application provide a display module, including:

[0005] A display panel includes a display area, which includes multiple sub-areas. Each sub-area includes a sub-pixel, and each sub-pixel includes a first electrode, a light-emitting functional layer, and a second electrode. The second electrodes of different sub-areas are disconnected from each other.

[0006] Multiple first power modules, each corresponding to a different sub-region, and each first power module is electrically connected to the second electrode of its corresponding sub-region.

[0007] In some possible implementations of the first aspect, the efficiency of the first power supply module is maximized under a preset current.

[0008] The preset current includes the normal current of the sub-area electrically connected to the first power module during the use of the display module;

[0009] Alternatively, the preset current includes the current of the sub-area electrically connected to the first power module in high-brightness display mode;

[0010] Alternatively, the preset current includes the current of the sub-area electrically connected to the first power module in normal display brightness mode. In some possible embodiments of the first aspect, the display module further includes:

[0011] The storage module stores a power lookup table, which includes the correspondence between the power supply voltage output by the first power module and the average screen brightness and / or display brightness level.

[0012] Optionally, the lower the average screen brightness, the lower the absolute value of the power supply voltage output by the first power module; and / or, the lower the display brightness level, the lower the absolute value of the power supply voltage output by the first power module, wherein the lower the display brightness level, the lower the brightness of the sub-pixel at the same gray level.

[0013] Optionally, the display module also includes a display driver chip, which is used to determine the average screen brightness of the sub-area according to the screen to be displayed, and to determine the power supply voltage of the first power supply module that matches the average screen brightness of the sub-area according to the power lookup table.

[0014] In some possible implementations of the first aspect, the display panel includes sub-pixels of multiple light-emitting colors, each sub-region including a sub-pixel of one light-emitting color, and the light-emitting colors of the sub-pixels in different sub-regions are different;

[0015] Optionally, the display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different emission colors. Under the same brightness, the current required by the first sub-pixel and the second sub-pixel is less than the current required by the third sub-pixel. The current corresponding to the maximum efficiency of the first power module electrically connected to the first sub-pixel is less than the current corresponding to the maximum efficiency of the first power module electrically connected to the third sub-pixel. The current corresponding to the maximum efficiency of the first power module electrically connected to the second sub-pixel is less than the current corresponding to the maximum efficiency of the first power module electrically connected to the third sub-pixel.

[0016] Optionally, the display area includes n sub-areas, n≥2, and n is an integer, and the display panel includes m sub-pixels with different luminous colors, n=m;

[0017] Optionally, the current corresponding to the maximum efficiency of the first power module electrically connected to the first sub-pixel is equal to the current corresponding to the maximum efficiency of the first power module electrically connected to the second sub-pixel.

[0018] Optionally, the first sub-pixel is used to emit red light, the second sub-pixel is used to emit green light, and the third sub-pixel is used to emit blue light.

[0019] In some possible implementations of the first aspect, the display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different light emission colors. Under the same brightness, the current required by the first sub-pixel is less than that required by the third sub-pixel, and the current required by the second sub-pixel is less than that required by the third sub-pixel.

[0020] One sub-region includes a first sub-pixel and a second sub-pixel, and the other sub-region includes a third sub-pixel;

[0021] Optionally, the first sub-pixel is used to emit red light, the second sub-pixel is used to emit green light, and the third sub-pixel is used to emit blue light.

[0022] In some possible implementations of the first aspect, multiple sub-region arrays are distributed, each sub-region including sub-pixels of multiple colors;

[0023] Optionally, each sub-region includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different emission colors.

[0024] In some possible implementations of the first aspect, the display area includes n sub-areas, n≥2, and n is an integer; there are n first power modules, and each first power module corresponds one-to-one with a sub-area; different first power modules are electrically connected to the second electrode of different sub-areas.

[0025] Optionally, at least two of the multiple first power modules are integrated into the same power chip;

[0026] Optionally, the power chip may further include a second power module, wherein at least one of the plurality of first power modules and the second power module are integrated into the same power chip;

[0027] Alternatively, at least two of the multiple first power modules are integrated into different power chips;

[0028] Optionally, at least one of the multiple first power modules and the second power module are integrated into different power chips;

[0029] Optionally, the sub-pixel also includes a pixel driving circuit, which is connected between the output of the second power module and the first electrode.

[0030] Optionally, the output voltage polarity of the second power module is different from that of the first power module;

[0031] Optionally, the first power module is a negative power module and the second power module is a positive power module.

[0032] Based on the same inventive concept, in a second aspect, embodiments of this application provide a driving method for a display module, used to drive a display module as described in any embodiment of the first aspect, the method comprising:

[0033] Determine the target power supply voltage corresponding to the sub-zone based on the target image to be displayed and / or the current display brightness level;

[0034] When the target image is displayed in the sub-area, the first power module electrically connected to the sub-area outputs the target power supply voltage.

[0035] In some possible implementations of the second aspect, determining the target power supply voltage corresponding to the sub-region as needed for the target screen to be displayed includes:

[0036] Determine the average image brightness of the sub-region based on the target image;

[0037] According to the power lookup table, the power supply voltage of the first power module that matches the average screen brightness of the sub-area is determined. The power lookup table includes the correspondence between the power supply voltage output by the first power module and the average screen brightness.

[0038] The power supply voltage of the first power module that matches the average screen brightness of the sub-region is used as the target power supply voltage for the sub-region.

[0039] Optionally, after the first power module electrically connected to the control sub-region outputs the target power supply voltage, the method further includes:

[0040] Determine if the display screen of the sub-area needs to be updated;

[0041] If so, return to the step of determining the target power supply voltage corresponding to the sub-area and controlling the first power supply module electrically connected to the sub-area to output the target power supply voltage when the target screen is displayed in the sub-area.

[0042] Based on the same inventive concept, in a second aspect, embodiments of this application provide a display device including a display module as described in any embodiment of the first aspect.

[0043] According to the display module and its driving method and display device provided in the embodiments of this application, since the second electrodes of different sub-regions are disconnected from each other, the voltage required by the second electrode of the sub-pixel of each sub-region can be controlled independently, which is conducive to achieving more precise control and improving image quality. In addition, different sub-regions are set for different first power modules, and each first power module is electrically connected to the second electrode of the corresponding sub-region. This is equivalent to dividing the sub-pixel current of the display panel into multiple paths, that is, dividing the total load current into multiple paths. Compared with a power module electrically connecting all sub-pixels of the entire display area, the embodiments of this application can help reduce the load current corresponding to each first power module under the same total load current, thereby helping to reduce the temperature of each first power module and improve the efficiency of each first power module. Attached Figure Description

[0044] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0045] Figure 1 This illustration shows a structural schematic diagram of a display module provided in an embodiment of this application;

[0046] Figure 2 This illustration shows a cross-sectional structural diagram of a display panel in a display module provided in an embodiment of this application;

[0047] Figure 3 This illustration shows a schematic diagram of an efficiency curve of the power module in a display module provided in an embodiment of this application;

[0048] Figure 4 This illustration shows another structural diagram of the display module provided in an embodiment of this application;

[0049] Figure 5 This illustration shows another structural diagram of the display module provided in an embodiment of this application;

[0050] Figure 6 This illustration shows another efficiency curve diagram of the power module in the display module provided in the embodiment of this application;

[0051] Figure 7 This illustration shows another structural diagram of the display module provided in an embodiment of this application;

[0052] Figure 8 This illustration shows another structural diagram of the display module provided in an embodiment of this application;

[0053] Figure 9 This illustration shows a schematic diagram of a pixel driving circuit in a display module provided in an embodiment of this application.

[0054] Figure 10 This illustration shows a flowchart of a driving method for a display module provided in an embodiment of this application;

[0055] Figure 11 This illustration shows another flowchart of the driving method for the display module provided in an embodiment of this application;

[0056] Figure 12 This illustration shows another flowchart of the driving method for the display module provided in an embodiment of this application;

[0057] Figure 13 This is a schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0058] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0060] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0061] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0062] It should be noted that when a component is described as "connected" or "electrically connected" to another component, it can be directly connected to the other component, or there may be one or more intermediate components in between.

[0063] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0064] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the related technologies:

[0065] The power supply chip in a display module provides power signals to sub-pixels, enabling them to emit light and display. For example, tablet computers, laptops, and automotive displays are relatively large and require a large load current, leading to an increase in the output current of the power supply chip. This, in turn, causes the power supply chip to overheat due to the high load current.

[0066] To address the aforementioned technical problems, this application provides a display module and its driving method, as well as a display device. The embodiments of this application will be described below with reference to the accompanying drawings.

[0067] like Figure 1 As shown, the display module 100 may include a display panel 10 and a plurality of first power modules 20. The display panel 10 includes a display area. The display area includes a plurality of sub-areas. Different first power modules 20 correspond to different sub-areas. Each first power module 20 is electrically connected to the second electrode of its corresponding sub-area.

[0068] Optionally, there can be n first power modules 20. n ≥ 2, and n is an integer. For example, the n first power modules 20 are 20-1 to 20-n.

[0069] The display area of ​​the display panel 10 may include n sub-areas, for example, the n sub-areas are A1 to An respectively. Figure 1 An exemplary top view of the display area of ​​the display panel 10 is shown. Each sub-area may include a sub-pixel 11. Figure 2 As shown, sub-pixel 11 may include a light-emitting element 110, which may include a first electrode 111, a light-emitting functional layer 113, and a second electrode 112. The second electrodes 112 of different sub-regions are disconnected from each other. The second electrodes of multiple sub-pixels within the same sub-region may be electrically connected to each other. The shape of the sub-region may be regular or irregular, such as rectangular or circular.

[0070] Different first power modules 20 are electrically connected to the second electrodes of different sub-regions. The n first power modules 20-1 to 20-n correspond one-to-one with the n sub-regions A1 to An. For example, first power module 20-1 is electrically connected to the second electrode in sub-region A1, first power module 20-2 is electrically connected to the second electrode in sub-region A2, ..., first power module 20-n is electrically connected to the second electrode in sub-region An. Each first power module 20 is only electrically connected to the second electrode of the sub-pixel in its corresponding sub-region, and is not electrically connected to the second electrodes of the sub-pixels in other sub-regions, effectively creating an insulated connection, equivalent to being disconnected from the second electrodes of the sub-pixels in other sub-regions. Optionally, each first power module has an output terminal that is electrically connected to the second electrodes of all sub-pixels in its corresponding sub-region.

[0071] For example, the first electrode 111 can be the anode, and the second electrode 112 can be the cathode. The light-emitting element of the sub-pixel can be an organic light-emitting diode (OLED). The first power module 20 can be used to generate a negative power supply voltage signal ELVSS to drive the sub-pixel 11. It is understood that the sub-pixel 11 is the load of the first power module 20.

[0072] In this embodiment, since the second electrodes of different sub-regions are disconnected from each other, the voltage required by the second electrode of the sub-pixel in each sub-region can be controlled independently, which is beneficial to achieve more precise control and improve image quality. In addition, different sub-regions are set for different first power modules, and each first power module is electrically connected to the second electrode of the corresponding sub-region. This is equivalent to dividing the sub-pixel current of the display panel into multiple paths, that is, dividing the total load current into multiple paths. Compared with a power module electrically connecting all sub-pixels of the entire display area, this embodiment can help reduce the load current corresponding to each first power module under the same total load current, thereby helping to reduce the temperature of each first power module and improve the efficiency of each first power module.

[0073] Optionally, n first power modules are set to correspond one-to-one with n sub-areas. This is equivalent to dividing the sub-pixel current of the display panel into n paths, which means dividing the total load current into n paths. Compared to a power module that electrically connects all sub-pixels of the entire display area, this embodiment of the application can help reduce the load current corresponding to each first power module under the same total load current, thereby helping to reduce the temperature of each first power module and improve the efficiency of each first power module.

[0074] For example, the first power module 20 may include transistors. In this embodiment, it is beneficial to reduce the resistance Rds(on) between the source and drain of the transistors when they are working, thereby reducing the losses of the first power module 20 when it is working, so as to reduce the temperature of the first power module and improve the efficiency of the first power module.

[0075] Understandably, the more sub-regions there are, the higher the control precision.

[0076] As an example, such as Figure 2As shown, the display panel 10 may include a substrate 1. A sub-pixel light-emitting element 110 may be located on one side of the substrate 1. A first electrode 111, a light-emitting functional layer 113, and a second electrode 112 may be located on one side of the substrate 1 and are sequentially stacked in a direction away from the substrate 1. Each sub-pixel may include a pixel driving circuit 01, which is electrically connected to the first electrode of the light-emitting element 110 to drive the light-emitting element to emit light. The pixel driving circuit 01 may be disposed on the substrate 1. The pixel driving circuit 01 may include a driving transistor, a data writing transistor, a storage capacitor, etc. The pixel driving circuit 01 may be a 2T1C circuit, a 7T1C circuit, etc. Of course, the pixel driving circuit 01 may also have other structures; this application does not limit the specific structure of the pixel driving circuit 01.

[0077] The display panel 10 may further include a pixel defining portion 4 and an isolation structure 3. The pixel defining portion 4 may include a pixel opening, and a light-emitting functional layer 113 may be disposed within the pixel opening.

[0078] The second electrodes 112 of different sub-regions can be disconnected from each other through the isolation structure 3. For example, the isolation structure 3 may include an isolation wall 31 and a barrier portion 32. The orthogonal projection area of ​​the barrier portion 32 on the substrate 1 may be larger than the orthogonal projection area of ​​the isolation wall 31 on the substrate 1.

[0079] Optionally, in the direction perpendicular to the plane of the substrate 1, the cross-section of the isolation wall 31 can be I-shaped, trapezoidal, or inverted trapezoidal.

[0080] The isolation wall 31 and the barrier 32 may include conductive or insulating materials.

[0081] When the isolation wall 31 is made of metal, only one of two adjacent sub-regions is in contact with the isolation wall 31, i.e., electrically connected. This can be achieved by adjusting the evaporation angle of the light-emitting functional layer 113 and the second electrode 112. The isolation wall 31 and the barrier portion 32 can also be made of insulating materials.

[0082] Figure 2 The way the second electrodes are disconnected from each other shown is merely an example and is not intended to limit this application. Alternatively, the second electrodes can be patterned using laser technology or other methods to achieve the disconnection of the second electrodes from each other.

[0083] For example, the first power module 20 can be connected to a battery and convert the power supply voltage input from the battery into the power supply voltage required by its corresponding sub-region. Efficiency can be defined as the ratio of energy from the input power supply to the output power supply energy converted by the first power module 20. High efficiency can help reduce the power consumption and heat of the first power module 20, thereby improving its reliability.

[0084] The inventors discovered through research that, for example Figure 3As shown, the efficiency of the first power supply module 20 varies under different load currents. For example, as the load current increases, the efficiency of the first power supply module 20 first increases and then decreases.

[0085] The parameters of the first power module 20 can be adjusted to maximize the efficiency of the first power module 20 under a preset current.

[0086] As an example, the preset current may include the common current of the sub-area electrically connected to the first power module during the use of the display module, where the duration of the common current in the sub-area is longer than the duration of other currents in the sub-area. Since the common current in the sub-area occurs for a longer period during the use of the display module, and the preset current is the common current, the first power module 20 can operate in a high-efficiency mode for an extended period, thus significantly reducing the power consumption and heat generation of the first power module 20.

[0087] For example, the usage process of the display module can be simulated based on the usage habits of most users. During the simulation, for any sub-region, the occurrence duration of each current in that sub-region can be counted, and then the current with the longest occurrence duration can be selected as the current corresponding to the maximum efficiency of the first power supply module for that sub-region.

[0088] For example, the display module may have different display brightness modes. For instance, the display module may have a High Brightness Mode (HBM) and a Normal Brightness Mode. In Normal Brightness Mode, the display module can display a maximum brightness of 500 nits. In High Brightness Mode, the display module can display a maximum brightness of 900 nits or higher.

[0089] As another example, the preset current may include the current of the sub-area electrically connected to the first power module 20 in the normal display brightness mode. That is, the efficiency of the first power module 20 can be maximized in the normal display brightness mode. Since the display module is usually used in the normal display brightness mode by the user, this allows the first power module 20 to operate in a high-efficiency mode for a relatively long time. Moreover, the current of the sub-area in the normal display brightness mode is relatively easy to obtain, which can reduce the amount of simulation work in the early stage and help improve the production efficiency of the display module.

[0090] As another example, the preset current may include the current of the sub-area electrically connected to the first power module 20 in the high-brightness display mode. That is, the efficiency of the first power module 20 can be maximized in the high-brightness display mode. Since the brightness in the high-brightness display mode is greater than other brightness display modes, the current in the high-brightness display mode is also greater. The preset current, being the current of the sub-area in the high-brightness display mode, ensures that the efficiency of the first power module 20 continuously increases as the current in the sub-area increases. This mitigates the problem of temperature rise caused by the increased sub-area current without a corresponding increase in the efficiency of the first power module 20.

[0091] For example, different first power modules supply power to different sub-regions, and the preset current corresponding to different first power modules can be different.

[0092] In one embodiment, such as Figure 4 As shown, the display module may also include a storage module 30, which stores a pre-stored power lookup table (LUT). The power lookup table may include the correspondence between the power supply voltage output by the first power module 20 and the average pixel level (APL) and / or data brightness value (DBV).

[0093] During actual display operation, the brightness of the display module constantly changes. The current required by each sub-pixel varies with different brightness levels. Therefore, different power supply voltages can be supplied to the second electrode of the sub-pixel at different average screen brightness levels to optimize display power consumption.

[0094] For example, the average screen brightness of each sub-region can be obtained. Based on a power lookup table, the power supply voltage of the first power module corresponding to the average screen brightness is matched, so that the first power module provides a matching power supply voltage to its corresponding sub-region, thereby optimizing the overall display power consumption. The lower the average screen brightness, the lower the current required by the sub-region. As described above, the first power module 20 can be used to generate a negative power supply voltage ELVSS. The smaller the absolute value of the power supply voltage output by the first power module 20, the smaller the current of the sub-pixel, and thus the smaller the current of the sub-region. When the average screen brightness is lower, the absolute value of the power supply voltage output by the first power module 20 can be smaller.

[0095] Optionally, the smaller the display brightness level, the smaller the absolute value of the power supply voltage output by the first power supply module. In this case, the smaller the display brightness level, the smaller the brightness of the sub-pixel at the same gray level.

[0096] Specifically, display devices such as mobile phones and computers usually include brightness adjustment buttons. Users use these buttons to change the input display brightness level, which is also called the display brightness value (DBV).

[0097] For example, the current display brightness level of each sub-area can be obtained, and based on the power lookup table, the power supply voltage of the first power module corresponding to the current display brightness level can be matched so that the first power module provides a matching power supply voltage to its corresponding sub-area, thereby optimizing the overall display power consumption.

[0098] It is understandable that the average screen brightness of different sub-regions may differ at the same time, thus the power supply voltage output by the first power supply module electrically connected to different sub-regions may differ at the same time. Similarly, the average screen brightness of the same sub-region may differ at different times, thus the power supply voltage output by the first power supply module electrically connected to the same sub-region may differ at different times.

[0099] Understandably, display modules can have different display brightness modes, also known as Data Brightness Values ​​(DBVs). Different DBVs have different maximum brightness levels, and the average screen brightness of a sub-region can differ under different DBVs. The higher the maximum brightness of the DBV corresponding to a sub-region, the higher the absolute value of the power supply voltage output by the first power supply module electrically connected to that sub-region can be.

[0100] For example, at the same time, different sub-regions can correspond to different DBVs. Alternatively, the same sub-region can correspond to different DBVs at different times.

[0101] In some embodiments, such as Figure 4 As shown, the display module may also include a display driver IC (DDIC) 40, which can control the display of grayscale images in each sub-area and control the first power module to output the power supply voltage required for the second electrode of each sub-area.

[0102] For example, the display driver chip 40 can be used to: determine the average screen brightness of a sub-area based on the screen to be displayed, and determine a power supply voltage that matches the average screen brightness of the sub-area based on a power lookup table.

[0103] For example, the storage module 30 may be integrated into the display driver chip 40.

[0104] In some embodiments, the display panel 10 may include sub-pixels of multiple emission colors, with each sub-region including a sub-pixel of one emission color, and the emission colors of sub-pixels in different sub-regions being different. That is, sub-pixels of the same emission color are located in the same sub-region.

[0105] In this embodiment, the voltage required for the second electrode of sub-pixels with different emission colors can be controlled individually, and the power supply voltage required for sub-pixels with different emission colors can be supplied separately, thereby achieving more precise control and improving image quality.

[0106] Optionally, the display panel includes m sub-pixels with different luminous colors, where n=m.

[0107] Optionally, the second electrodes of sub-pixels with the same emission color are electrically connected to the same first power module 20. Optionally, the second electrodes of sub-pixels with different emission colors are electrically connected to different first power modules 20.

[0108] Optionally, each first power module 20 is electrically connected to the second electrode of a sub-pixel emitting one color. Optionally, different first power modules 20 are electrically connected to the second electrodes of sub-pixels emitting different colors. As an example, such as Figure 5 As shown, n=m=3, the display panel 10 may include a first sub-pixel, a second sub-pixel, and a third sub-pixel with different emitting colors. For example, the first sub-pixel R emits red light, the second sub-pixel G emits green light, and the third sub-pixel B emits blue light. The second electrodes of the first sub-pixel R, the second sub-pixel G, and the third sub-pixel B are all disconnected from each other.

[0109] Multiple first sub-pixels R can be located in a first sub-region A1, and the second electrodes of the multiple first sub-pixels R within the first sub-region A1 can be electrically connected to each other. A first power supply module 20-1 can be electrically connected to the second electrodes of the first sub-pixels R.

[0110] Multiple second sub-pixels G can be located in the second sub-region A2, and the second electrodes of the multiple second sub-pixels G within the second sub-region A2 can be electrically connected to each other. The first power supply module 20-2 can be electrically connected to the second electrodes of the second sub-pixels G.

[0111] Multiple third sub-pixels B can be located in the third sub-region A3, and the second electrodes of the multiple third sub-pixels B within the third sub-region A3 can be electrically connected to each other. The first power supply module 20-3 can be electrically connected to the second electrodes of the third sub-pixels B.

[0112] For example, sub-pixels of different emission colors may have different luminous efficiencies, so at the same display brightness, sub-pixels of different emission colors require different currents.

[0113] Each sub-region includes a sub-pixel with a single emission color. When the emission colors of the sub-pixels in different sub-regions are different, the current corresponding to the maximum efficiency of the first power module in different sub-regions may be different.

[0114] For example, the luminous efficiency of the first sub-pixel R and the second sub-pixel G is greater than that of the third sub-pixel B. Under the same display brightness, the current required by the first sub-pixel R and the second sub-pixel G is less than that required by the third sub-pixel B.

[0115] like Figure 6 As shown, curve 1 is the efficiency curve of the first power module 20-1 electrically connected to the first sub-pixel R, curve 2 is the efficiency curve of the first power module 20-2 electrically connected to the second sub-pixel G, and curve 3 is the efficiency curve of the first power module 20-3 electrically connected to the third sub-pixel B. The current corresponding to the maximum efficiency of the first power module 20-1 and the current corresponding to the maximum efficiency of the first power module 20-2 can both be less than the current corresponding to the maximum efficiency of the first power module 20-3. In this way, it is beneficial to reduce the power consumption and heat of the first power module 20 corresponding to each sub-region.

[0116] For example, the luminous efficiency of the first sub-pixel R and the second sub-pixel G tends to be the same, and under the same display brightness, the current required by the first sub-pixel R and the second sub-pixel G also tends to be the same. The current corresponding to the maximum efficiency of the first power module 20-1 can be equal to the current corresponding to the maximum efficiency of the first power module 20-2.

[0117] In other embodiments, as described above, the display panel 10 may include a first sub-pixel, a second sub-pixel, and a third sub-pixel with different light emission colors. Under the same display brightness, the current required by the first sub-pixel R is less than the current required by the third sub-pixel B, and the current required by the second sub-pixel G is less than the current required by the third sub-pixel B.

[0118] Since the current required for the first sub-pixel R and the second sub-pixel G is relatively small, such as Figure 7 As shown, the first sub-pixel R and the second sub-pixel G can be located in the same sub-region A1, meaning their second electrodes can be electrically connected. The first sub-pixel R and the second sub-pixel G can share a single first power module 20-1. The third sub-pixel B, however, requires a larger current. Therefore, the third sub-pixel B can be located in another sub-region A2, and it can use a separate first power module 20-2. This approach reduces the heat generated by each first power module and also reduces the number of first power modules required, thus lowering costs.

[0119] In other embodiments, the region may not be divided according to the emission color of the sub-pixels. For example... Figure 4 As shown, multiple (e.g., n) sub-regions can be arranged in an array. Each sub-region can include sub-pixels of multiple colors. This allows for independent control of the voltage of the second electrode in each sub-region, which helps improve display uniformity.

[0120] For example, each sub-region may include a first sub-pixel R, a second sub-pixel G, and a third sub-pixel B with different emission colors.

[0121] The inventors discovered that the higher the integration level of the power supply chip, the more stable the performance of mass-produced power supply chips. In some embodiments, at least two of the n first power modules 20 can be integrated into the same power supply chip. For example... Figure 4 , Figure 5 or Figure 6 As shown, multiple (e.g., n) first power modules 20 can be integrated into the same power chip.

[0122] For example, such as Figure 4 , Figure 5 or Figure 6 As shown, the display module may further include a second power module 50. The second power module 50 has a different output voltage polarity than the first power module 20. For example, the first power module 20 is a negative power module, and the second power module 50 is a positive power module.

[0123] The second power module 50 can be used to generate a positive power supply voltage signal ELVDD. The second power module 50 can be electrically connected to the pixel driving circuit. At least one of a plurality of (e.g., n) first power modules 20 and the second power module 50 can be integrated into the same power chip. For example, a plurality of (e.g., n) first power modules 20 and the second power module 50 can be integrated into the same power chip to further improve the stability of the power chip.

[0124] There can be only one second power module 50, meaning that all sub-pixels share the same second power module 50, and all sub-pixels are electrically connected to the same output terminal of the second power module 50. Within the same sub-pixel, the driving transistor and the light-emitting element in the pixel driving circuit 01 are connected in series between the output terminal of the second power module 50 and the corresponding output terminal of the first power module 20.

[0125] In other embodiments, at least two of the plurality (e.g., n) of the first power modules 20 are also integrated into different power chips, which helps to reduce the temperature of the power chips.

[0126] For example, such as Figure 8 As shown, multiple (e.g., n) first power modules 20 can be integrated into n power chips respectively.

[0127] For example, at least one of a plurality of (e.g., n) first power modules 20 and a second power module 50 may be integrated into different power chips to further reduce the temperature of the power chips.

[0128] For example, multiple (e.g., n) first power modules 20 are integrated into multiple (e.g., n) power chips, and each can be integrated into a different power chip as the second power module 50.

[0129] For example, such as Figure 9 As shown, the pixel driving circuit 01 in the sub-pixel is connected between the output terminal of the second power module 50 and the first electrode of the light-emitting element 110. The second electrode of the light-emitting element 110 is electrically connected to the output terminal of the first power module 20. Figure 9 Taking the pixel driving circuit 01 as a 2T1C circuit as an example, the pixel driving circuit 01 includes two transistors and one capacitor. The gate of the data writing transistor T2 is connected to the scan line (scan), the first electrode of the data writing transistor T2 is connected to the data line (data), the second electrode of the data writing transistor T2 is connected to the gate of the driving transistor T1, the first electrode of the driving transistor T1 is connected to the output terminal of the second power module 50, the second electrode of the driving transistor T1 is connected to the first electrode of the light-emitting element 110, and the second electrode of the light-emitting element 110 is connected to the output terminal of the first power module 20. The first electrode of the storage capacitor Cst is connected to the gate of the driving transistor T1, and the second electrode of the storage capacitor Cst is connected to the output terminal of the second power module 50.

[0130] As described above, the pixel driving circuit 01 can also be a 7T1C circuit or other circuit structures, and this application does not limit it in this regard.

[0131] Based on the same inventive concept, this application also provides a driving method for a display module, which can be used to drive the display module as described in any of the above embodiments.

[0132] like Figure 10 As shown, the driving method for the display module provided in this application embodiment may include S91~S92.

[0133] S91, determine the target power supply voltage corresponding to the sub-zone based on the target image to be displayed and / or the current display brightness level;

[0134] S92, when the target image is displayed in the sub-area, controls the first power module electrically connected to the sub-area to output the target power supply voltage.

[0135] The specific implementation methods for each of the above steps will be explained below.

[0136] In this embodiment, controlling the first power module to output the target power supply voltage required by its corresponding sub-area facilitates more precise control and improves image quality. Furthermore, by setting different sub-areas for different first power modules, and electrically connecting each first power module to the second electrode of its corresponding sub-area, the sub-pixel current of the display panel is effectively divided into multiple paths, thus dividing the total load current into multiple paths. Compared to a single power module electrically connecting all sub-pixels of the entire display area, this embodiment helps reduce the load current corresponding to each first power module under the same total load current, thereby reducing the temperature of each first power module and improving its efficiency.

[0137] Optionally, n first power modules are set to correspond one-to-one with n sub-areas. This is equivalent to dividing the sub-pixel current of the display panel into n paths, which means dividing the total load current into n paths. Compared with one power module electrically connecting multiple sub-areas, the embodiments of this application can help reduce the load current corresponding to each first power module under the same total load current, thereby helping to reduce the temperature of each first power module and improve the efficiency of each first power module.

[0138] The power supply voltage of the first power module that matches the average screen brightness and / or current display brightness level of the sub-area can be determined according to the power lookup table. The power lookup table includes the correspondence between the power supply voltage output by the first power module and the average screen brightness and / or current display brightness level.

[0139] First, let's introduce the S91.

[0140] For example, the target power supply voltage required for each sub-region can be pre-stored.

[0141] In some embodiments, as described above, the storage module 30 of the display module may include a pre-stored power lookup table, which may include the correspondence between the power supply voltage output by the first power module 20 and the average screen brightness.

[0142] like Figure 11 As shown, S91 may specifically include S911 to S913.

[0143] S911, determine the average screen brightness of the sub-area based on the target screen;

[0144] S912, according to the power lookup table, determine the power supply voltage of the first power module that matches the average screen brightness of the sub-area. The power lookup table includes the correspondence between the power supply voltage output by the first power module and the average screen brightness.

[0145] S913 uses the power supply voltage that matches the average screen brightness of the sub-region as the target power supply voltage for the sub-region.

[0146] During actual display, the brightness of the display module constantly changes. The current required by the sub-pixels varies with different brightness levels. This application embodiment can provide different power supply voltages to the second electrode of the sub-pixels under different average screen brightness levels, thereby optimizing display power consumption.

[0147] For example, in S911, the grayscale levels to be displayed for each sub-pixel within any sub-region can be determined based on the target image, and the average grayscale level to be displayed in that sub-region can be used as the average image brightness. The average image brightness of each sub-region can be determined one by one, and then the power supply voltage of the first power module matching the average image brightness of each sub-region can be determined one by one. Alternatively, the average image brightness and the power supply voltage of the matching first power module of the previous sub-region can be determined first, and then the average image brightness and the power supply voltage of the matching first power module of the next sub-region can be determined. The execution order of each step can be set as needed, and this embodiment does not limit this.

[0148] Prior to the S912, the display module can be pre-calibrated to obtain the power lookup table.

[0149] For example, during the debugging process of the power supply voltage for any average screen brightness, the actual power supply voltage corresponding to the average screen brightness can be continuously adjusted so that the final power supply voltage can meet the average screen brightness while the power consumption is basically minimized. Then, the final power supply voltage and the average screen brightness are recorded.

[0150] Since there are many average screen brightness values, you can adjust only the power supply voltage corresponding to a portion of the average screen brightness values.

[0151] If the average screen brightness of the sub-region is different from the average screen brightness in the power lookup table, the power supply voltage of the first power module that matches the average screen brightness of the sub-region can be determined based on the power supply voltages corresponding to the two average screen brightnesses closest to the average screen brightness of the sub-region in the power lookup table and the linear interpolation method.

[0152] In S913, if the power supply voltage matched to different sub-regions is different, then the target power supply voltage of different sub-regions will also be different.

[0153] Next, we will introduce the S92.

[0154] For example, the display driver chip of the display module can be connected to the first power module via a wired communication interface (e.g., an IIC interface).

[0155] S91~S92 can be executed by the display driver chip. The display driver chip can send control commands to the first power module through a wired communication interface (such as an IIC interface) to make the first power module output the target power supply voltage.

[0156] For example, such as Figure 12 As shown, after S92, the display driving method provided in this application embodiment may further include S93.

[0157] S93, determine whether the display screen of the sub-area needs to be updated. If so, repeat S91~S92.

[0158] In this embodiment, a matching target power supply voltage can be provided for each screen to be displayed in the sub-area, which helps to optimize display power consumption when displaying each screen.

[0159] Optionally, the driving method for the display module may include:

[0160] S914, According to the power lookup table, determine the power supply voltage of the first power module that matches the current display brightness level. The power lookup table includes the correspondence between the power supply voltage output by the first power module and the current display brightness level.

[0161] S915 uses the power supply voltage that matches the current display brightness level as the target power supply voltage for the sub-zone.

[0162] Based on the same inventive concept, this application also provides a display device, including the display module provided in this application. Please refer to... Figure 13 , Figure 13 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 13 The provided display device 1000 includes the display module 100 provided in any of the above embodiments of this application. Figure 13 This embodiment uses a mobile phone as an example to illustrate the display device 1000. It is understood that the display device provided in this application embodiment can be other display devices with display functions, such as computers, televisions, and vehicle-mounted display devices. This application does not impose specific limitations on these. The display device provided in this application embodiment has the beneficial effects of the display module provided in this application embodiment. For details, please refer to the specific descriptions of the display module in the above embodiments. These descriptions will not be repeated here.

[0163] The embodiments described above are not exhaustive, nor do they limit the application to the specific embodiments described herein. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A display module, characterized in that, include: A display panel includes a display area, which includes multiple sub-areas, each sub-area including a sub-pixel, and each sub-pixel including a first electrode, a light-emitting functional layer, and a second electrode, wherein the second electrodes of different sub-areas are disconnected from each other. Multiple first power modules, different first power modules correspond to different sub-regions, and each first power module is electrically connected to the second electrode of the corresponding sub-region; The display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different light emission colors. Under the same brightness, the current required by the first sub-pixel is less than that required by the third sub-pixel, and the current required by the second sub-pixel is less than that required by the third sub-pixel.

2. The display module according to claim 1, characterized in that, Under the preset current, the efficiency of the first power supply module is the highest; The preset current includes the normal current of the sub-area electrically connected to the first power module during the use of the display module; Alternatively, the preset current includes the current of the sub-area electrically connected to the first power module in high-brightness display mode; Alternatively, the preset current may include the current of the sub-area electrically connected to the first power module in the normal display brightness mode.

3. The display module according to claim 1, characterized in that, The display module also includes: A storage module is provided for storing a power lookup table, which includes the correspondence between the power supply voltage output by the first power module and the average screen brightness and / or display brightness level.

4. The display module according to claim 3, characterized in that, The lower the average screen brightness, the lower the absolute value of the power supply voltage output by the first power module; and / or, the lower the display brightness level, the lower the absolute value of the power supply voltage output by the first power module, wherein the lower the display brightness level, the lower the brightness of the sub-pixel at the same grayscale.

5. The display module according to claim 3, characterized in that, The display module further includes a display driver chip, which is used to determine the average screen brightness of the sub-area according to the screen to be displayed, and to determine the power supply voltage of the first power module that matches the average screen brightness of the sub-area according to the power lookup table.

6. The display module according to any one of claims 1 to 5, characterized in that, Each of the sub-regions includes a sub-pixel with a single emission color, and the emission colors of the sub-pixels in different sub-regions are different.

7. The display module according to claim 6, characterized in that, The current corresponding to the maximum efficiency of the first power module to which the first sub-pixel is electrically connected is less than the current corresponding to the maximum efficiency of the first power module to which the third sub-pixel is electrically connected, and the current corresponding to the maximum efficiency of the first power module to which the second sub-pixel is electrically connected is less than the current corresponding to the maximum efficiency of the first power module to which the third sub-pixel is electrically connected.

8. The display module according to claim 7, characterized in that, The display area includes n sub-areas, where n ≥ 2 and n is an integer, and the display panel includes m sub-pixels with different luminous colors, where n = m.

9. The display module according to claim 7, characterized in that, The current corresponding to the maximum efficiency of the first power module to which the first sub-pixel is electrically connected is equal to the current corresponding to the maximum efficiency of the first power module to which the second sub-pixel is electrically connected.

10. The display module according to any one of claims 1 to 5, characterized in that, One of the sub-regions includes the first sub-pixel and the second sub-pixel, and the other sub-region includes the third sub-pixel.

11. The display module according to claim 1, characterized in that, The first sub-pixel is used to emit red light, the second sub-pixel is used to emit green light, and the third sub-pixel is used to emit blue light.

12. The display module according to any one of claims 1-5, characterized in that, The sub-regions are distributed in an array, and each sub-region includes sub-pixels of multiple colors.

13. The display module according to claim 12, characterized in that, Each of the sub-regions includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different emission colors.

14. The display module according to claim 1, characterized in that, The display area includes n sub-areas, where n ≥ 2 and n is an integer. There are n first power modules, and each first power module corresponds to one of the sub-areas. Different first power modules are electrically connected to the second electrode of different sub-areas.

15. The display module according to claim 14, characterized in that, At least two of the plurality of the first power modules are integrated into the same power chip.

16. The display module according to claim 15, characterized in that, The power chip also includes a second power module, and at least one of the plurality of first power modules and the second power module are integrated in the same power chip. Alternatively, at least two of the multiple first power modules may be integrated into different power chips.

17. The display module according to claim 16, characterized in that, At least one of the first power modules and the second power module are integrated into different power chips.

18. The display module according to claim 16 or 17, characterized in that, The sub-pixel also includes a pixel driving circuit, which is connected between the output terminal of the second power module and the first electrode.

19. The display module according to claim 18, characterized in that, The second power module has a different output voltage polarity than the first power module.

20. The display module according to claim 19, characterized in that, The first power module is a negative power module, and the second power module is a positive power module.

21. A driving method for a display module, characterized in that, The method for driving a display module as described in any one of claims 1 to 20 includes: Determine the target power supply voltage corresponding to the sub-zone based on the target image to be displayed and / or the current display brightness level; When the target image is displayed in the sub-area, the first power module electrically connected to the sub-area is controlled to output the target power voltage.

22. The method according to claim 21, characterized in that, Determining the target power supply voltage corresponding to the sub-area as needed for the target screen to be displayed includes: Based on the target image, determine the average image brightness of the sub-region; According to the power lookup table, the power supply voltage of the first power module that matches the average screen brightness of the sub-area is determined. The power lookup table includes the correspondence between the power supply voltage output by the first power module and the average screen brightness. The power supply voltage of the first power module that matches the average screen brightness of the sub-region is taken as the target power supply voltage for the sub-region.

23. The method according to claim 22, characterized in that, After the first power module controlling the electrical connection of the sub-region outputs the target power supply voltage, the method further includes: Determine whether the display screen of the sub-area needs to be updated; If so, then return to the execution of the steps of determining the target power supply voltage corresponding to the sub-area, and controlling the first power module electrically connected to the sub-area to output the target power supply voltage when the target screen is displayed in the sub-area.

24. A display device, characterized in that, Includes the display module according to any one of claims 1 to 20.

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