Display driving method and apparatus, and electronic device and readable storage medium

Abstract

A display driving method and apparatus, and an electronic device and a readable storage medium. The display driving method is applied to a display panel. The display panel comprises a plurality of sub-pixels arranged in an array, and a pixel driving circuit for each sub-pixel comprises a driving transistor (T3) and a light-emitting unit (EL), wherein the driving transistor (T3) comprises a first stage, a second stage and a control stage; the first stage of the driving transistor (T3) is connected to a second node (N2); the second stage of the driving transistor (T3) is connected to a third node (N3); and a positive electrode of the light-emitting unit (EL) is connected to a fourth node (N4). The display driving method comprises: acquiring the display state of a display panel (301); and when the display state indicates switching from a refresh frame to a hold frame, resetting the potentials of a second node (N2), a third node (N3) and a fourth node (N4) (302).

Description

Display driving methods, devices, electronic devices, and readable storage media

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202410813796.6, filed in China on June 21, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of display technology, and in particular to a display driving method, apparatus, electronic device, and readable storage medium. Background Technology

[0004] With the development of display technology, users have higher and higher requirements for screen flicker of display panels. Taking foldable display panels as an example, in order to reduce energy consumption, foldable display panels will switch to a relatively low refresh rate such as 1Hz in some scenarios. At low refresh rates, static screen flicker and frequency switching screen flicker of the display panel are relatively obvious, affecting the display effect. Summary of the Invention

[0005] This application provides a display driving method, apparatus, electronic device, and readable storage medium for bonded structures to improve the resistance measurement effect for bonded structures.

[0006] To solve the above problems, this application is implemented as follows:

[0007] In a first aspect, embodiments of this application provide a display driving method applied to a display panel, the display panel including a plurality of sub-pixels arranged in an array, the pixel driving circuit of the sub-pixels including a driving transistor and a light-emitting unit, wherein the driving transistor includes a first stage, a second stage and a control stage, the first stage of the driving transistor is connected to a second node, the second stage of the driving transistor is connected to a third node, and the positive electrode of the light-emitting unit is connected to a fourth node;

[0008] The method includes:

[0009] Get the display status of the display panel;

[0010] When the display state switches from a refresh frame to a hold frame, the potentials of the second node, the third node, and the fourth node are reset. The display panel has a low target brightness digital brightness stage and a high target brightness digital brightness stage. The reset voltage value of the driving transistor in the low target brightness digital brightness stage is less than the reset voltage value in the high target brightness digital brightness stage.

[0011] In some embodiments, during the digital brightness phase with low target brightness, the initial voltage of the driving transistor is -3.9V to -4.1V;

[0012] During the digital brightness phase with high target brightness, the initial voltage of the driving transistor is -4.4V to -4.6V.

[0013] In some embodiments, the pixel driving circuit further includes a light-emitting control transistor, and the method further includes:

[0014] The light-emitting unit is controlled to emit light by the light-emitting control crystal, wherein the on-time of the light-emitting control transistor is 91% to 93% in each switching cycle.

[0015] In some embodiments, the display panel includes multiple digital brightness stages, with different target brightness corresponding to different digital brightness stages;

[0016] In some embodiments, the display panel has nine normal brightness digital brightness stages, each corresponding to a different target brightness. The low target brightness digital brightness stages are six digital brightness stages with relatively low target brightness, and the high target brightness digital brightness stages are three digital brightness stages with relatively high target brightness.

[0017] In some embodiments, the method further includes:

[0018] In the holding frame, the voltage of the second node is controlled to be a holding voltage, wherein the holding voltage is 6.4V to 6.6V.

[0019] In some embodiments, the method further includes:

[0020] Adjust the duration of the pulse zone on the display panel so that the sum of the duration of the pulse zone and the number of rows on the display panel is an integer multiple of the pulse period duration.

[0021] In some embodiments, a transition frame image is inserted between the refresh frame and the hold frame, wherein the image of the transition frame includes:

[0022] 10 frames of images at a 60Hz refresh rate; or

[0023] 6 frames per second at a 30Hz refresh rate; or

[0024] 50 frames per second image at a 30Hz refresh rate.

[0025] Secondly, embodiments of this application provide a display driving device applied to a display panel, the display panel including a plurality of sub-pixels arranged in an array, the pixel driving circuit of the sub-pixels including a driving transistor and a light-emitting unit, wherein the driving transistor includes a first stage, a second stage and a control stage, the first stage of the driving transistor is connected to a second node, the second stage of the driving transistor is connected to a third node, and the positive electrode of the light-emitting unit is connected to a fourth node.

[0026] The display driving device includes:

[0027] The acquisition module is used to acquire the display status of the display panel;

[0028] The reset module is used to reset the potentials of the second node, the third node, and the fourth node when the display state is switched from a refresh frame to a hold frame.

[0029] Thirdly, embodiments of this application provide an electronic device, including a touch panel, a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of any of the methods described in the first aspect.

[0030] Fourthly, embodiments of this application provide a readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in any of the first aspects. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 is a circuit diagram of a pixel driving circuit in one embodiment of this application;

[0033] Figure 2 is a circuit diagram of a pixel driving circuit in another embodiment of this application;

[0034] Figure 3 is a flowchart of the display driver in one embodiment of this application;

[0035] Figure 4A is a comparative diagram of display panel switching in related technologies;

[0036] Figure 4B is a schematic diagram comparing the switching of the display panel in one embodiment of this application;

[0037] Figure 5 is a schematic diagram of the structure of a display driving device according to an embodiment of this application;

[0038] Figure 6 is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The terms "first," "second," etc., used in the embodiments of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices. Additionally, the use of "and / or" in this application indicates at least one of the connected objects, such as A and / or B and / or C, representing seven possibilities: including A alone, B alone, C alone, and the presence of both A and B, both B and C, both A and C, and the presence of A, B, and C.

[0041] This application provides a display driving method applied to a display panel.

[0042] In some embodiments, the display panel includes an array of sub-pixels, each sub-pixel including a pixel driving circuit, as shown in Figures 1 and 2. In this embodiment, different pixel driving circuits can be selected. For example, it can be a 7T1C (7 transistors T1 to T7, 1 storage capacitor Cst) pixel driving circuit shown in Figure 1, or an 8T1C (8 transistors T1 to T8, 1 storage capacitor Cst) pixel driving circuit shown in Figure 2, and is not limited to this. The pixel driving circuit includes a driving transistor T3 and a light-emitting unit EL.

[0043] Please refer to Figure 1 or Figure 2. The driving transistor T3 includes a first stage, a second stage, and a control stage. The first stage of the driving transistor T3 is connected to the second node N2, the second stage of the driving transistor T3 is connected to the third node N3, and the positive terminal of the light-emitting unit EL is connected to the fourth node N4.

[0044] As shown in Figure 3, in one embodiment, the method includes:

[0045] Step 301: Obtain the display status of the display panel;

[0046] Step 302: When the display state is switched from refresh frame to hold frame, reset the potential of the second node, the third node and the fourth node, wherein the display panel has a low target brightness digital brightness stage and a high target brightness digital brightness stage, and the reset voltage value of the driving transistor in the low target brightness digital brightness stage is less than the reset voltage value in the high target brightness digital brightness stage.

[0047] In the technical solution of this embodiment, when the display screen of the display panel is switched from a refresh frame to a hold frame, the refresh rate of the display panel is generally reduced to reduce energy consumption. When the refresh rate is reduced, the load of the driver chip DDIC will decrease. At this time, the voltage of voltage signals VGL, VGH and Vinti in the display panel will increase. This voltage fluctuation will cause the brightness of the display panel to change, which may result in screen flickering.

[0048] In the technical solution of this embodiment, when it is necessary to switch the screen displayed on the display panel from a refresh frame to a hold frame, resetting the second node, the third node and the fourth node of the pixel driving circuit can reduce voltage fluctuations, thereby adjusting the brightness of the hold frame, avoiding sudden brightness changes that cause screen flickering, and helping to improve the display effect.

[0049] In some embodiments, the pixel driving circuit further includes light-emitting control transistors, as shown in Figures 1 and 2. In this embodiment, the light-emitting control transistors specifically include a first light-emitting control transistor T5 and a first light-emitting control transistor T6.

[0050] The method also includes:

[0051] The light-emitting unit is controlled to emit light by the light-emitting control crystal, wherein the on-time of the light-emitting control transistor is 91% to 93% in each switching cycle.

[0052] In the technical solution of this embodiment, the conduction time ratio, or duty cycle, of the light-emitting control transistor in each switching cycle is further adjusted to control the duty cycle to be 91% to 93%. Specifically, it can be different values ​​such as 91%, 91.1%, 91.5%, 92%, 92.2%, 92.5%, 92.7%, and 93%.

[0053] It is important to understand that in related technologies, the duty cycle is usually controlled at around 98%, as shown in Figure 4A. In these technologies, when the duty cycle is high, the display panel will exhibit a noticeable color shift when the display frequency is switched from 120Hz to 10Hz.

[0054] As shown in Figure 4B, in this embodiment, after reducing the duty cycle, the color shift between different display frequencies is significantly improved, which can improve the color shift when switching display frequencies, thereby improving the display effect.

[0055] In some embodiments, the display panel includes multiple digital brightness stages, with different target brightness corresponding to different digital brightness stages.

[0056] The gamma of the display device 300 is generally set to multiple gamma bands (digital brightness stages). Taking a mobile phone as an example, the gamma of a mobile phone is generally set to 13 digital brightness stages, including 1 HBM (high brightness mode), three AOD (always on display mode), and 9 NOR modes (Normal mode).

[0057] In this embodiment, the nine "nor" values ​​are named "nor1", "nor2", ... "nor9" in sequence. Each of the 13 digital brightness stages has a specified number of gray levels. The brightness of each gray level in each digital brightness stage is different from the brightness of each gray level in other digital brightness stages.

[0058] In some exemplary embodiments, the target brightness decreases sequentially in the nor1, nor2...nor9 modes. In the technical solution of this embodiment, for the digital brightness stage where the target brightness is relatively high, the initialization voltage Vinti1 of the driving transistor T3 is set to -4.4V to -4.6V.

[0059] For the digital brightness stage where the target brightness is relatively low, the initial voltage Vinti1 of the driving transistor T3 is set to -3.9V to -4.1V.

[0060] In this way, by increasing the driving transistor T3, the flickering phenomenon when the display panel switches display frequencies can be effectively reduced. In addition, the power consumption of the display panel can also be effectively reduced during low digital brightness stages.

[0061] In some embodiments, the display panel has nine normal brightness digital brightness stages, each corresponding to a different target brightness. The low target brightness digital brightness stages are six digital brightness stages (nor4 to nor9) with relatively low target brightness, and the high target brightness digital brightness stages are three digital brightness stages (nor1 to nor3) with relatively high target brightness.

[0062] In some embodiments, the method further includes:

[0063] In the holding frame, the voltage of the second node is controlled to be a holding voltage, wherein the holding voltage is 6.4V to 6.6V.

[0064] As shown in Figures 1 and 2, during the refresh frame, the voltage signal provided by Vint2 is written to the fourth node N4 through the seventh transistor T7. During the hold frame, the voltage signal provided by Vint2 is also written to the fourth node N4 through the seventh transistor T7 to reset the voltage of the fourth node N4, thereby maintaining the consistency of its voltage. This helps to reduce the brightness fluctuation of the display panel and reduce screen flicker.

[0065] In some embodiments, the method further includes:

[0066] Adjust the duration of the pulse zone on the display panel so that the sum of the duration of the pulse zone and the number of rows on the display panel is an integer multiple of the pulse period duration.

[0067] In the technical solution of this embodiment, the number of rows of the display panel is 2224H, the exemplary number of pulses is 12, and the duration of each cycle is 4H. At this time, the duration of the control porch area (display blanking stage) is 80H. In this way, it is guaranteed that N = (80 + 2224) / (4 * 12) = 48 is an integer. That is to say, it can be guaranteed that the duration of each row is an integer number of cycles, which effectively reduces the risk of data misalignment and helps to improve the display effect.

[0068] In some embodiments, a transition frame image is inserted between the refresh frame and the hold frame.

[0069] When the image displayed on the display panel switches from a refresh frame to a hold frame, the refresh rate of the display panel will also decrease. In order to ensure the continuity of image display during this process, this embodiment further inserts a transition frame image between the refresh frame and the hold frame.

[0070] In this embodiment, the transition frame image includes any one of the following: 10 frames refreshed at a 60Hz refresh rate; or 6 frames refreshed at a 30Hz refresh rate; or 50 frames refreshed at a 30Hz refresh rate.

[0071] During implementation, the corresponding image can be selected based on the time interval required to switch from the refresh frame to the hold frame. Generally, the longer the required time interval, the more images can be inserted. For example, when the refresh rate of the display panel switches from 120Hz to 1Hz within 1 second, 50 frames of images refreshed at a 30Hz refresh rate can be inserted, which helps to maintain the continuity of the displayed images and avoid image stuttering affecting the display effect.

[0072] This application provides a display driving device applied to a display panel. The display panel includes multiple sub-pixels arranged in an array. The pixel driving circuit of the sub-pixels includes a driving transistor and a light-emitting unit. The driving transistor includes a first stage, a second stage, and a control stage. The first stage of the driving transistor is connected to a second node, the second stage of the driving transistor is connected to a third node, and the positive electrode of the light-emitting unit is connected to a fourth node.

[0073] As shown in Figure 5, in one embodiment, the display driving device 500 includes:

[0074] The acquisition module 501 is used to acquire the display status of the display panel;

[0075] The reset module 502 is used to reset the potentials of the second node, the third node, and the fourth node when the display state is switched from a refresh frame to a hold frame. The display panel has a low target brightness digital brightness stage and a high target brightness digital brightness stage. The reset voltage value of the driving transistor in the low target brightness digital brightness stage is less than the reset voltage value in the high target brightness digital brightness stage.

[0076] In some embodiments, during the digital brightness phase with low target brightness, the initial voltage of the driving transistor is -3.9V to -4.1V;

[0077] During the digital brightness phase with high target brightness, the initial voltage of the driving transistor is -4.4V to -4.6V.

[0078] In some embodiments, the pixel driving circuit further includes a light-emitting control transistor, and the device further includes:

[0079] A light-emitting control module is used to control the light-emitting unit to emit light through the light-emitting control crystal, wherein the on-time of the light-emitting control transistor accounts for 91% to 93% of each switching cycle.

[0080] In some embodiments, the display panel has nine normal brightness digital brightness stages, each corresponding to a different target brightness. The low target brightness digital brightness stages are six digital brightness stages with relatively low target brightness, and the high target brightness digital brightness stages are three digital brightness stages with relatively high target brightness.

[0081] In some embodiments, the device further includes:

[0082] A voltage holding module is used to control the voltage of the second node to a holding voltage in the holding frame, wherein the holding voltage is 6.4V to 6.6V.

[0083] In some embodiments, the method further includes:

[0084] The duration control module is used to adjust the duration corresponding to the porch area of ​​the display panel, so that the sum of the duration corresponding to the porch area and the number of rows of the display panel is an integer multiple of the pulse period duration.

[0085] In some embodiments, it also includes:

[0086] A transition frame insertion module is used to insert a transition frame image between the refresh frame and the hold frame when the display state switches from a refresh frame to a hold frame, wherein the image of the transition frame includes:

[0087] 10 frames of images at a 60Hz refresh rate; or

[0088] 6 frames per second at a 30Hz refresh rate; or

[0089] 50 frames per second image at a 30Hz refresh rate.

[0090] Please refer to Figure 6, which is a schematic diagram of the structure of an electronic device provided in an embodiment of this disclosure. The display panel includes a touch panel. The electronic device may also include a processor 601, a memory 602, and a program 6021 stored in the memory 602 and executable on the processor 601.

[0091] When program 6021 is executed by processor 601, it can implement any of the steps in the above method embodiments and achieve the same beneficial effects, which will not be repeated here.

[0092] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by hardware related to program instructions, and the program can be stored in a readable medium.

[0093] This disclosure also provides a readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement any of the steps in the above method embodiments and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0094] The computer-readable storage medium of this disclosure can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. For example, a computer-readable storage medium can be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0095] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0096] The program code contained on the storage medium can be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0097] Computer program code for performing the operations of this disclosure can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0098] The above description represents the preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles described herein, and these improvements and modifications should also be considered within the scope of protection of this disclosure.

Claims

1. A display driving method applied to a display panel, the display panel comprising a plurality of sub-pixels arranged in an array, a pixel driving circuit of the sub-pixel comprising a driving transistor and a light emitting unit, wherein, The driving transistor comprises a first stage, a second stage and a control stage, the first stage of the driving transistor is connected with the second node, the second stage of the driving transistor is connected with the third node, and the positive electrode of the light-emitting unit is connected with the fourth node; The method comprises: acquiring a display state of a display panel; in the case where the display state is switched from a refresh frame to a holding frame, resetting the potentials of the second node, the third node and the fourth node, wherein the display panel has a low target brightness digital brightness stage and a high target brightness digital brightness stage, and the reset voltage value of the driving transistor in the low target brightness digital brightness stage is less than the reset voltage value of the driving transistor in the high target brightness digital brightness stage.

2. The display driving method according to claim 1, wherein In the low target brightness digital brightness stage, the initialization voltage of the driving transistor is -3.9V to -4.1V; In the high target brightness digital brightness stage, the initialization voltage of the driving transistor is -4.4V to -4.6V.

3. The display driving method according to claim 1 or 2, wherein The pixel driving circuit further comprises a light-emitting control transistor, and the method further comprises: controlling the light-emitting unit to emit light through the light-emitting control transistor, wherein in each switching cycle, the on duration ratio of the light-emitting control transistor is 91% to 93%.

4. The display driving method according to claim 1 or 2, wherein The display panel has 9 normal brightness digital brightness stages, each digital brightness stage corresponding to different target brightness, wherein the low target brightness digital brightness stage is 6 digital brightness stages with relatively low target brightness, and the high target brightness digital brightness stage is 3 digital brightness stages with relatively high target brightness.

5. The display driving method according to claim 1 or 2, wherein The method further comprises: in the holding frame, controlling the voltage of the second node to be a holding voltage, wherein the holding voltage is 6.4V to 6.6V.

6. The display driving method according to claim 1 or 2, wherein The method further comprises: adjusting the time length corresponding to the porch area of the display panel, so that the sum of the time length corresponding to the porch area and the number of rows of the display panel is an integer multiple of the pulse cycle time length.

7. The display driving method according to claim 1 or 2, wherein In the case where the display state is switched from a refresh frame to a holding frame, the method further comprises: inserting a transition frame image between the refresh frame and the holding frame, wherein the image of the transition frame comprises: 10 frames of images at a refresh rate of 60Hz; or 6 frames of images at a refresh rate of 30Hz; or 50 frames of images at a refresh rate of 30Hz.

8. A display driving apparatus applied to a display panel, the display panel comprising a plurality of sub-pixels arranged in an array, a pixel driving circuit of the sub-pixel comprising a driving transistor and a light emitting unit, wherein, The driving transistor comprises a first stage, a second stage and a control stage, the first stage of the driving transistor is connected with the second node, the second stage of the driving transistor is connected with the third node, and the positive electrode of the light-emitting unit is connected with the fourth node; The display driving device comprises: an acquisition module configured to acquire a display state of a display panel; a reset module configured to reset the potentials of the second node, the third node and the fourth node in the case where the display state is switched from a refresh frame to a holding frame, wherein the display panel has a low target brightness digital brightness stage and a high target brightness digital brightness stage, and the reset voltage value of the driving transistor in the low target brightness digital brightness stage is less than the reset voltage value of the driving transistor in the high target brightness digital brightness stage.

9. An electronic device comprising a touch panel, a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of any one of claims 1 to 7.

10. A readable storage medium having stored thereon a computer program, the computer program, when executed by a processor, implementing the steps of the method of any one of claims 1 to 7.

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