Display panel, display panel control method and electronic device

Abstract

Provided in the embodiments of the present application are a display panel, a display panel control method and an electronic device. The display panel comprises a plurality of pixels arranged in rows and columns, and a control module, wherein each pixel comprises a plurality of sub-pixel circuits, and each sub-pixel circuit comprises a current mirror module, which is used for providing a stable drive current for a light-emitting device of the sub-pixel circuit on the basis of a reference current; and the control module is electrically connected to the sub-pixel circuit. Before scanning the sub-pixel circuit, the control module is used for controlling the sub-pixel circuit to perform pre-charging on the current mirror module, wherein a pre-charging voltage is related to a charging voltage for charging the current mirror module of the sub-pixel circuit. The display panel can improve the charging speed of a sub-pixel circuit in the display panel and reduce the charging duration of the sub-pixel circuit, thereby improving the display quality of the display panel.

Description

Display panel, display panel control method and electronic device

[0001] This application claims priority to Chinese Patent Application No. 202411830510.1, filed on December 11, 2024, entitled “Display Panel, Display Panel Control Method and Electronic Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of microdisplays, and more particularly to a display panel, a display panel control method, and an electronic device. Background Technology

[0003] With the continuous development of display technology, people's requirements for display panels in terms of image quality, color accuracy, and response speed are increasing. In the field of modern display panel technology, pixel structure and its control methods have become key factors in achieving high-quality displays. Currently, display panels are generally composed of a matrix of numerous pixels. To achieve full-color display, each pixel can contain multiple sub-pixels. By utilizing the different colors displayed by each sub-pixel and controlling the state of the sub-pixels, rich colors can be synthesized to achieve image display.

[0004] Currently, the sub-pixels are controlled by a current mirror circuit via a row scan signal. The row scan signal scans sub-pixels row by row, and the corresponding current mirror circuit activates when a sub-pixel is selected. The current mirror circuit replicates or scales the current proportionally to provide driving current for the light-emitting devices in the sub-pixel, precisely adjusting the brightness to display accurate colors and grayscale levels. However, charging the current mirror circuits in the sub-pixels during the scanning phase may result in a long charging time, which compresses the light-emitting duration of the light-emitting devices. This leads to a shorter display duration on the display panel where the pixel is located, resulting in poor display quality.

[0005] Therefore, improving the display quality of display panels is an urgent problem to be solved. Summary of the Invention

[0006] This application provides a display panel, a display panel control method, and an electronic device to improve the display quality of the display panel.

[0007] In a first aspect, embodiments of this application provide a display panel, the display panel including a plurality of pixels arranged in rows and columns and a control module, the pixels including a plurality of sub-pixel circuits, the sub-pixel circuit including a current mirror module for providing a stable driving current for the light-emitting devices of the sub-pixel circuit based on a reference current;

[0008] The control module and the sub-pixel circuit are electrically connected;

[0009] The control module is configured to control the sub-pixel circuit to pre-charge the current mirror module before scanning the sub-pixel circuit, wherein the pre-charging voltage is related to the charging voltage used to charge the current mirror module of the sub-pixel circuit.

[0010] Secondly, embodiments of this application provide a display panel control method. The display panel includes multiple pixels arranged in rows and columns and a control module. Each pixel includes multiple sub-pixel circuits. Each sub-pixel circuit includes a current mirror module that provides a stable driving current for the light-emitting devices of the sub-pixel circuit based on a reference current.

[0011] Based on the charging voltage of the sub-pixel circuit, obtain the pre-charging voltage that controls the sub-pixel circuit to pre-charge the current mirror module;

[0012] Based on the pre-charge voltage, the sub-pixel circuit is controlled to pre-charge the current mirror module.

[0013] Thirdly, embodiments of this application provide an electronic device, which includes a display panel as described in any one of the first aspects.

[0014] The display panel, display panel control method, and electronic device provided in this application embodiment pre-charge the sub-pixel circuit by using an externally connected control module to control the sub-pixel circuit to pre-charge according to the charging voltage used to charge the current mirror module of the sub-pixel circuit before scanning the sub-pixel circuit in the display panel. This allows the current mirror module of the sub-pixel circuit to complete charging faster after pre-charging, thereby accelerating the charging speed of the current mirror module of the sub-pixel circuit, reducing the compressed light emission time of the light-emitting device, and improving the display quality of the display panel. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] Figure 1 is a schematic diagram of the structure of the display panel provided in this application;

[0017] Figure 2 is a schematic diagram of the circuit structure of a sub-pixel provided in this application;

[0018] Figure 3 is a schematic diagram of the working timing of a display panel provided in this application;

[0019] Figure 4 is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0020] Figure 5 is a schematic diagram of another display panel provided in an embodiment of this application;

[0021] Figure 6 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application;

[0022] Figure 7 is a schematic diagram of another display panel provided in an embodiment of this application;

[0023] Figure 8 is a schematic diagram of another display panel provided in an embodiment of this application;

[0024] Figure 9 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application;

[0025] Figure 10 is a schematic diagram of another display panel provided in an embodiment of this application;

[0026] Figure 11 is a schematic diagram of the working timing of another display panel provided in this application;

[0027] Figure 12 is a schematic diagram of another display panel provided in an embodiment of this application;

[0028] Figure 13 is a schematic diagram of another display panel provided in an embodiment of this application;

[0029] Figure 14 is a schematic diagram of another display panel provided in an embodiment of this application;

[0030] Figure 15 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application;

[0031] Figure 16 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application;

[0032] Figure 17 is a schematic diagram of another display panel provided in an embodiment of this application;

[0033] Figure 18 is a schematic diagram of another display panel provided in an embodiment of this application;

[0034] Figure 19 is a schematic diagram of another display panel provided in an embodiment of this application;

[0035] Figure 20 is a schematic diagram of another display panel provided in an embodiment of this application;

[0036] Figure 21 is a flowchart illustrating a display panel control method provided in an embodiment of this application.

[0037] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] In the field of display technology, display panels display images through pixels. A display panel can include multiple pixels arranged in rows and columns; that is, the pixels in a display panel can be arranged in a matrix form with multiple rows and columns. For each pixel, the pixel can include at least one sub-pixel to achieve different color display effects.

[0040] Taking the display of colors based on the Red-Green-Blue (RGB) color model as an example, the subpixels within a pixel can be arranged in an RGB pattern. For example, a pixel can include red, green, and blue subpixels, arranged sequentially. With this arrangement, various colors can be mixed by adjusting the brightness of each subpixel. For instance, when the red and green subpixels are lit at the same brightness, the human eye perceives yellow. This arrangement is widely used in common display technologies such as Liquid Crystal Displays (LCDs) and Organic Light-Emitting Diodes (OLEDs).

[0041] In addition, the colors displayed by pixels can also be based on other color models, such as the Red-Green-Blue-White (RGBW) color model. In this case, the arrangement of subpixels in the pixel is the same as that of the color model.

[0042] Figure 1 is a schematic diagram of the display panel provided in this application. As shown in Figure 1, the display panel is described using a row scanning circuit as an example.

[0043] The display panel shown in Figure 1 includes multiple sub-pixels arranged in a matrix (for ease of explanation, only the 2×2 sub-pixel array portion of the display panel is shown in Figure 1; it should be understood that this 2×2 sub-pixel array is only a part of the sub-pixel array of the display panel, namely sub-pixel 1_1, sub-pixel 1_2, sub-pixel 2_1, and sub-pixel 2_2, each sub-pixel including a corresponding light-emitting device). This matrix arrangement helps to precisely control the state of each sub-pixel, thereby achieving high-resolution image display.

[0044] For each row of sub-pixels in the array, the scanning process is performed using the same scanning signal output module (sub-pixels 1_1 and 1_2 in the first row are scanned using scanning signal 1, and sub-pixels 2_1 and 2_2 in the second row are scanned using scanning signal 2). The scanning signal output module provides scanning signals row by row in a predetermined order. For example, starting from the first row of the sub-pixel array, the scanning signal output module outputs a specific scanning signal with a certain voltage and frequency. When this scanning signal reaches a sub-pixel in that row, it triggers operations such as transistor conduction, capacitor charging initialization, and data signal writing in the circuit of that row's sub-pixel, preparing for subsequent charging and light emission of the sub-pixel. Each row of sub-pixels has its corresponding scanning signal to ensure that each row of sub-pixels is operated on at the appropriate time, avoiding signal interference and confusion.

[0045] For each column of sub-pixels in the array, they are charged through the same reference current module (i.e., sub-pixels 1_1 and 2_1 in the first column are charged through reference current module Ref1, and sub-pixels 1_2 and 2_2 in the second column are charged through reference current module Ref2). Each column of sub-pixels shares a single reference current module, which provides a stable current. The current provided by the reference current module is precisely designed to meet the charging requirements of the sub-pixels.

[0046] Each sub-pixel includes a light-emitting device, which may be, for example, a light-emitting diode (LED), an organic light-emitting diode (OLED), etc. This application does not limit the application to this.

[0047] During display on the display panel, the scan signal output module turns on row by row, scanning the sub-pixels in the row corresponding to each scan signal output module. During scanning, the reference current module (e.g., Ref1 and Ref2 in the diagram) corresponding to the column of each sub-pixel in that row charges the sub-pixel so that the light-emitting device in that sub-pixel can emit light after its path is subsequently turned on. This charging process stores electrical energy in components such as capacitors inside the sub-pixel. Once charging is complete, if the sub-pixel needs to emit light, the stored electrical energy can be used to drive the light-emitting device to emit light by turning on its path.

[0048] To facilitate understanding, the circuit structure of each sub-pixel in Figure 1 is described below. Figure 2 is a schematic diagram of the circuit structure of a sub-pixel provided in this application. As shown in Figure 2, the sub-pixel includes a current mirror circuit and a light-emitting device. Figure 2 uses a P-type metal-oxide-semiconductor (PMOS) current mirror circuit as an example for description. The circuit of this sub-pixel includes a second switch, a third switch, a fourth switch, a fifth switch, and a capacitor.

[0049] In this configuration, the gate of the third switch is connected to the output of the scan signal output module, its source is connected to the output of the reference current module and the source of the fourth switch, and its drain is connected to the drain of the second switch. The gate of the fourth switch is connected to the gate of the third switch and the output of the scan signal output module. The source of the second switch is connected to the first terminal of the capacitor, the power supply terminal, and the drain of the second switch, while its gate is connected to the second terminal of the capacitor, the drain of the fourth switch, and the gate of the second switch. The source of the second switch is connected to the drain of the fifth switch. The source of the fifth switch is connected to the anode of the light-emitting device, and its gate is connected to the pulse-width modulation (PMW) module. The cathode of the light-emitting device is connected to the Earth Low Voltage Signal Source (ELVSS).

[0050] When the scan signal output module outputs a scan signal, the third and fourth switching transistors are turned on, allowing the reference current module to charge the capacitor in the current mirror circuit. The fifth switching transistor turns on or off the path between the current mirror circuit and the light-emitting device according to the enable signal output by the PWM module, thereby controlling the current mirror circuit to drive the light-emitting device to emit light or turn off.

[0051] When each sub-pixel in the sub-pixel array shown in Figure 1 has the circuit structure shown in Figure 2, the working state of the sub-pixels in the display panel can be divided into a scanning stage and a light-emitting stage. Figure 3 is a schematic diagram of the working timing of a display panel provided in this application. Based on the aforementioned Figures 1 and 2, as shown in Figure 3, during the scanning stage, the enable signal output by the PWM module is a third level that turns off the path between the current mirror circuit and the light-emitting device. Each scanning signal scans the sub-pixels in the array corresponding to the scanning signal in the row, and charges the sub-pixels in that row through the reference current module during scanning.

[0052] After the display panel completes line-by-line scanning, it enters the light-emitting stage. At this time, the enable signal output by the PWM module is the fourth level that turns on the path between the current mirror circuit and the light-emitting device, so that each sub-pixel can drive the light-emitting device corresponding to that sub-pixel to emit light based on the current mirror module within that sub-pixel that has completed charging.

[0053] When the enable signal output by the PWM module changes from the fourth level back to the third level, the path between the current mirror module and the light-emitting device is cut off, so that the light-emitting device is turned off.

[0054] However, during the scanning phase, when charging the current mirror circuit in the sub-pixel, the duration for which the display panel displays each frame of the image is fixed. In the sub-pixel circuit, this duration includes both the scanning phase and the light-emitting phase. The greater the difference between the charging voltage output by the reference current module when charging the current mirror circuit and the original voltage of the capacitor in the current mirror circuit, the longer the charging time will be. A longer charging time leads to a compression of the light-emitting device's emission time, resulting in a shorter emission time and consequently, a shorter image display time on the display panel where the pixel is located, leading to poorer display quality.

[0055] In view of this, this application provides a display panel in which, before scanning the sub-pixel circuit in the display panel, an externally connected control module controls the sub-pixel circuit to pre-charge according to the charging voltage used to charge the sub-pixel circuit. This enables the sub-pixel circuit to complete charging faster after pre-charging, thereby accelerating the charging speed of the sub-pixel circuit, reducing the compressed light emission time of the light-emitting device, and improving the display quality of the display panel.

[0056] Figure 4 is a schematic diagram of a display panel provided in an embodiment of this application. As shown in Figure 4, the display panel includes multiple pixels arranged in rows and columns and a control module. Each pixel includes multiple sub-pixel circuits, and each sub-pixel circuit includes a current mirror module that provides a stable driving current for the light-emitting devices of the sub-pixel circuit based on a reference current.

[0057] The control module and the sub-pixel circuit are electrically connected.

[0058] The control module is used to control the sub-pixel circuit to pre-charge the current mirror module before scanning the sub-pixel circuit. The pre-charge voltage is related to the charging voltage used to charge the current mirror module of the sub-pixel circuit.

[0059] The control module can be, for example, a processor, microprocessor, control circuit, or digital-to-analog converter of the display panel; any circuit or electronic component capable of performing its control function is acceptable, and this application does not impose any limitations on this. The control module can obtain the scan time of the sub-pixel circuit and control the sub-pixel circuit to pre-charge the current mirror module before the scan time begins. The control module can obtain the scan time from the controller (e.g., processor, microprocessor, etc.) of the display panel, or from the module in the display panel used to scan the sub-pixel circuit. For example, the sub-pixel circuit may include a pre-charging phase in addition to the scanning phase. The pre-charging phase occurs before the scanning phase, meaning the end time of the pre-charging phase is earlier than the start time of the scan time. The control module can pre-charge the current mirror module of the sub-pixel circuit during the pre-charging phase by controlling the voltage input element in the sub-pixel circuit.

[0060] In one possible implementation, the control module can acquire the charging voltage used to charge the current mirror module of the sub-pixel circuit, and instruct the voltage input element to precharge the current mirror module of the sub-pixel circuit with the charging voltage.

[0061] Another possible implementation is that the control module only instructs the sub-pixel circuit to perform a pre-charging operation (e.g., by outputting a pre-charging indication signal to the sub-pixel circuit to instruct it to perform a pre-charging operation), and the sub-pixel circuit performs the pre-charging operation after receiving the pre-charging operation instruction.

[0062] The pre-charge voltage can be determined, for example, through a mapping relationship between pre-charge voltage and charging voltage. The sub-pixel circuit determines the charging voltage corresponding to the charging operation in the current scanning phase based on the charging voltage and this mapping relationship. Optionally, the mapping relationship may include, for example, the charging voltage and the corresponding pre-charge voltage. Alternatively, the mapping relationship may include the charging voltage and a preset voltage difference. When the mapping relationship includes the charging voltage and the preset voltage difference, the sub-pixel circuit determines the pre-charge voltage based on the sum of the charging voltage and the preset voltage difference, or the difference between the charging voltage and the preset voltage difference.

[0063] The pre-charge voltage is designed to ensure that the scanning phase duration is within a preset time. This preset time can be determined based on actual needs, and this application does not impose any restrictions on it.

[0064] Specifically, the pre-charge voltage can be higher or lower than the charging voltage; this application does not limit this. When the pre-charge voltage is lower than the charging voltage, the charging speed of the current mirror module of the sub-pixel circuit during the scanning phase is higher than when the pre-charge voltage is higher than the charging voltage. Furthermore, when the pre-charge voltage is lower than the charging voltage, or vice versa, the smaller the difference between the pre-charge voltage and the charging voltage, the faster the charging speed of the current mirror module of the sub-pixel circuit during the scanning phase.

[0065] For example, assuming the charging voltage for charging the sub-pixel circuit during the scanning phase is 1V, when the pre-charging voltages are 0.8V, 0.9V, 1.1V, and 1.2V, the charging speed of the current mirror module of the sub-pixel circuit during the scanning phase corresponding to different pre-charging voltages, from high to low, is as follows: 0.9V pre-charging voltage is higher than 0.8V pre-charging voltage, 0.8V pre-charging voltage is higher than 1.1V pre-charging voltage, and 1.1V pre-charging voltage is higher than 1.2V pre-charging voltage.

[0066] Therefore, based on the relationship between the pre-charge voltage and the charging voltage, which affects the charging speed of the current mirror module of the sub-pixel circuit during the scanning stage, a pre-charge voltage corresponding to the charging voltage can be set to improve the charging speed of the current mirror module of the sub-pixel circuit during the scanning stage.

[0067] It should be understood that the specific value of the pre-charging voltage in this application can be determined according to the actual situation. This application does not impose any restrictions on this, as long as it can be ensured that after the sub-pixel circuit is pre-charged by the pre-charging voltage, the charging time required for the current mirror module of the sub-pixel circuit is less than or equal to the preset time.

[0068] The display panel provided in this application, before scanning the sub-pixel circuit in the display panel, uses an externally connected control module to control the sub-pixel circuit to pre-charge the current mirror module according to the charging voltage used to charge the current mirror module of the sub-pixel circuit. This allows the sub-pixel circuit to complete charging more quickly after pre-charging the current mirror module, thereby accelerating the charging speed of the current mirror module, reducing the compressed light emission time of the light-emitting device, and improving the display quality of the display panel.

[0069] Figure 5 is a schematic diagram of another display panel structure provided in an embodiment of this application. As shown in Figure 5, the sub-pixel circuit includes a pre-charging module.

[0070] The input terminal of the pre-charge module is connected to the first output terminal of the control module, and the output terminal is connected to the input terminal of the current mirror module.

[0071] The pre-charge module is used to output a pre-charge voltage according to the pre-charge indication signal output by the control module. The pre-charge voltage is used to pre-charge the current mirror module.

[0072] In this circuit, the sub-pixel circuit needs to charge the current mirror module during operation to achieve its function. For example, charging the current mirror module in the sub-pixel circuit drives the light-emitting device electrically connected to the sub-pixel circuit.

[0073] The pre-charge module receives a pre-charge indication signal from the control module at its input terminal and outputs a pre-charge voltage to the current mirror module based on this signal. This pre-charge voltage initializes the voltage at the input terminal of the current mirror module, setting it to the pre-charge voltage. This ensures that during the scanning phase, when the sub-pixel circuit charges the current mirror module, it controls the duration for the voltage at the current mirror module's input terminal to adjust to the charging voltage. This guarantees that the scanning phase duration for each frame displayed on the display panel is less than or equal to a preset duration, improving the charging efficiency of the display panel during the scanning phase and ultimately enhancing the display quality.

[0074] In one possible implementation, the pre-charge voltage output by the pre-charge module is controlled by the control module. For example, the control module can include the pre-charge voltage value in a pre-charge indication signal sent to the pre-charge module, or indicate the pre-charge voltage value using a signal independent of the pre-charge indication signal. Based on the pre-charge voltage value indicated by the control module, the pre-charge module adjusts the pre-charge constant voltage to that value and then outputs the pre-charge voltage to the current mirror module to pre-charge it.

[0075] Another possible implementation is that the pre-charge voltage output by the pre-charge module is preset. After receiving the pre-charge indication signal sent by the control module, the pre-charge module directly outputs the pre-charge voltage to the current mirror module to pre-charge the current mirror module.

[0076] Below, taking the control module's role in controlling the pre-charge voltage output by the pre-charge module as an example, we will provide a detailed explanation of how the control module determines the pre-charge voltage.

[0077] Case 1: All sub-pixel circuits in the display panel have the same charging voltage.

[0078] The control module is specifically used to determine the pre-charge voltage based on the charging voltage.

[0079] One possible implementation is that the control module determines a pre-charge voltage that is lower than the charging voltage based on the charging voltage value. Since charging efficiency is high when the pre-charge voltage is lower than the charging voltage, the charging time of the current mirror module can be shortened.

[0080] Another possible implementation involves the control module determining a pre-charge voltage that is greater than the charging voltage, based on the charging voltage value. The voltage difference between the pre-charge voltage and the charging voltage is less than or equal to a preset voltage difference. This approach reduces the difference between the input voltage of the current mirror module and the charging voltage by decreasing the pre-charge voltage, thereby shortening the charging time of the current mirror module and improving charging efficiency.

[0081] In both of the above implementation methods, the control module can determine the pre-charge voltage through the charging voltage and the mapping relationship between the pre-charge voltage and the charging voltage, which will not be elaborated here.

[0082] Case 2: The charging voltage of the sub-pixel circuits in different rows of the display panel is different.

[0083] Figure 6 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application. As shown in Figure 6, the display panel includes n rows of sub-pixel circuits. During the scanning phase, when the scanning signal 1 scans the first row of sub-pixel circuits (i.e., the time period corresponding to when the scanning signal is low), the sub-pixel circuits in that row are simultaneously charged (i.e., charged through Ref in Figure 6). After the scanning of the first row of sub-pixel circuits is completed, the scanning signal 2 scans and charges the second row of sub-pixel circuits. As can be seen from Figure 6, the sub-pixel circuits of the row being scanned first need to wait until all the current mirror modules in the sub-pixel circuits of the row being scanned later have completed charging before entering the working phase (e.g., the light-emitting phase of the light-emitting device electrically connected to the sub-pixel circuit). However, if there is leakage in the devices of the sub-pixel circuits, the current mirror modules in the sub-pixel circuits of the row being scanned first will experience reduced charging effect due to leakage during the time period while waiting for all the current mirror modules in the sub-pixel circuits of the row being scanned later to complete charging. Therefore, in this case, different charging voltages can be set for the sub-pixel circuits of different rows in the display panel to compensate for leakage. For example, the charging voltage of the first row is greater than the charging voltage of the second row, the charging voltage of the second row is greater than the charging voltage of the third row, and so on.

[0084] Therefore, the charging voltage of sub-pixel circuits in different rows of the display panel may be different. In this case, the control module can determine the pre-charge voltage in one of two ways.

[0085] Method 1: Control module, specifically used to determine the pre-charge voltage of each row's sub-pixel circuit based on the charging voltage of each row when the charging voltage of the current mirror module in the sub-pixel circuit of different rows is different.

[0086] In this implementation, the control module can individually obtain the charging voltage of the current mirror module in each row of sub-pixel circuits (e.g., from an external source, or from a module that charges each row of sub-pixel circuits), and determine the pre-charging voltage of each row of sub-pixel circuits based on the charging voltage of each row and the mapping relationship between the pre-charging voltage and the charging voltage.

[0087] Method 2: Control module, specifically used to determine the pre-charge voltage for all sub-pixel circuits based on the minimum value among the charging voltages corresponding to at least some of the row sub-pixel circuits.

[0088] In this implementation, the control module can individually acquire the charging voltage of each row of sub-pixel circuits (e.g., from an external source or from the module that charges the sub-pixel circuits), and then determine the minimum charging voltage from these voltages. Alternatively, the control module can acquire the charging voltage row by row. If the charging voltage of the current row is less than the charging voltage of the previous row, the charging voltage of the current row is taken as the minimum charging voltage, and the module continues to acquire the charging voltage of the next row and compare it with the charging voltage of the current row. If the charging voltage of the next row is less than the charging voltage of the current row, the charging voltage of the next row is taken as the minimum charging voltage, and so on, until the charging voltage of the last row is compared to obtain the minimum charging voltage among all rows.

[0089] Optionally, the control module can obtain either the charging voltage of the sub-pixel circuits corresponding to all rows or the charging voltage of the sub-pixel circuits corresponding to a portion of the rows. In specific implementation, it can be used flexibly according to the actual situation.

[0090] After determining the minimum charging voltage, the pre-charging voltage for the current mirror module in all sub-pixel circuits is determined based on the minimum charging voltage and the mapping relationship between the pre-charging voltage and the charging voltage.

[0091] Figure 7 is a schematic diagram of another display panel provided in an embodiment of this application. As shown in Figure 7, the pre-charging module includes: a first switch and a pre-charging power supply sub-module.

[0092] The control terminal of the first switch is connected to the first output terminal of the control module, the second terminal is connected to the output terminal of the pre-charge power supply submodule, and the third terminal is connected to the input terminal of the current mirror module.

[0093] The pre-charge power supply submodule is used to output the pre-charge voltage.

[0094] The first switch is used to close the path between the pre-charge power supply submodule and the current mirror module when a pre-charge indication signal is received from the control module.

[0095] The control module determines the time to output a pre-charge indication signal to the first switch based on the scan time. When the first switch receives the pre-charge indication signal from the control module, it closes the path between the pre-charge power supply submodule and the current mirror module, so that the pre-charge voltage output by the pre-charge power supply module can pre-charge the capacitor in the current mirror module.

[0096] Optionally, the pre-charge voltage is a preset voltage value. Alternatively, the pre-charge voltage is determined by the pre-charge power module according to the control of the control module. When the pre-charge voltage is determined by the pre-charge power module according to the control of the control module, there is an electrical connection between the control module and the pre-charge power module, and the control module can indicate the pre-charge voltage by sending a pre-charge voltage indication signal to the pre-charge power module. For example, the pre-charge power module can output a pre-charge voltage corresponding to the level of the preset pre-charge voltage indication signal based on the level of the pre-charge voltage indication signal received from the control module and a preset mapping relationship between the level of the pre-charge voltage indication signal and the pre-charge voltage.

[0097] Optionally, the first switch can be an N-type metal-oxide-semiconductor (PMOS) switch, or a PMOS switch, or a complementary metal-oxide-semiconductor (CMOS) switch. When the first switch is an NMOS switch or a PMOS switch, the first terminal connected to the output terminal of the control module is the gate of the switch.

[0098] Taking the row scanning circuits in Figures 1 and 2 as examples, Figure 8 is a schematic diagram of another display panel provided in an embodiment of this application. As shown in Figure 8, the display panel also includes a scanning signal output module and a reference current module.

[0099] The control module is electrically connected to the scanning signal output module and the reference current module.

[0100] The control module is used to control the sub-pixel circuit to perform pre-charging according to the scanning time before scanning by the scanning signal output module after obtaining the scanning time of the sub-pixel circuit from the scanning signal output module. The pre-charging voltage is related to the charging voltage of the reference current module for charging the sub-pixel circuit.

[0101] During the scanning process of the row scanning circuit, the sub-pixel circuits of different rows need to be scanned row by row by the corresponding scan signal output module to turn on the third and fourth switches of the current mirror module in each sub-pixel circuit of each row. After turning on the third and fourth switches of the current mirror module in the sub-pixel circuit, the reference current module of each column of the sub-pixel circuit charges the capacitor of the current mirror module in its corresponding sub-pixel circuit. If the voltage that the reference current module needs to write to the capacitor has a large voltage difference from the original voltage of the capacitor (i.e., when the voltage difference between the charging voltage and the voltage at point Vg in Figure 8 is large), the charging time of the reference current module for the capacitor will also be long, resulting in low charging efficiency and thus poor display quality of the display panel.

[0102] Therefore, the control module can control the pre-charging module to pre-charge the capacitor of the current mirror module in the sub-pixel circuit before the scanning signal output module of the corresponding sub-pixel circuit outputs the scanning signal (i.e., pre-charge the current mirror module) according to the time when the scanning signal output module outputs the scanning signal and the voltage (i.e., the voltage required by the reference current module to write to the capacitor). This reduces the voltage difference between the capacitor charging to the voltage required by the reference current module to write to the capacitor, or initializes the voltage at the input terminal of the capacitor to a voltage value lower than the charging voltage. This reduces the charging time of the reference current module for the current mirror module, improves charging efficiency, and thus improves the display quality of the display panel.

[0103] In the circuit structure shown in Figure 8, the effect of the relationship between the pre-charge voltage and the charging voltage on the charging speed of the sub-pixel circuit during the scanning stage can be illustrated by the following examples in Figures 9 and 10, which illustrate how to set the pre-charge voltage.

[0104] Figure 9 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application. As shown in Figure 9, the original voltage of the capacitor (i.e., the voltage at point Vg) is lower than the voltage (i.e., Ref) that the reference current module needs to write to the capacitor. At this time, the pre-charge voltage (e.g., Vc1, Vc2, Vc3) can be set to a voltage value higher than Vg but lower than Ref, so that the voltage at point Vg is changed to the pre-charge voltage through the pre-charge operation, reducing the voltage difference between the pre-charge voltage and the Ref voltage, thereby improving the charging speed of the sub-pixel circuit during the scanning stage. Among them, the charging speed of the sub-pixel circuit during the scanning stage, from fastest to slowest, is as follows: when the pre-charge voltage is Vc3, it is greater than when the pre-charge voltage is Vc2; when the pre-charge voltage is Vc2, it is greater than when the pre-charge voltage is Vc1; and when the pre-charge voltage is Vc1, it is greater than when no pre-charge is performed.

[0105] Figure 10 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application. As shown in Figure 10, the original voltage of the capacitor (i.e., the voltage at point Vg) is higher than the voltage (i.e., Ref) that the reference current module needs to write to the capacitor. At this time, the pre-charge voltage (e.g., Vc1, Vc2, Vc3) can be set to a voltage value lower than the Vg voltage, such as Vc4 to Vc8 in Figure 10, so that the voltage at point Vg is changed to the pre-charge voltage through the pre-charge operation, reducing the voltage difference between the pre-charge voltage and the Ref voltage, thereby improving the charging speed of the sub-pixel circuit during the scanning stage. Among them, the charging speed of the sub-pixel circuit during the scanning stage from fast to slow is as follows: the pre-charge voltage of Vc5 is greater than the pre-charge voltage of Vc4, the pre-charge voltage of Vc4 is greater than the pre-charge voltage of Vc6, the pre-charge voltage of Vc6 is greater than the pre-charge voltage of Vc7, the pre-charge voltage of Vc7 is greater than the pre-charge voltage of Vc8, and the pre-charge voltage of Vc8 is greater than when no pre-charge is performed.

[0106] In one possible implementation, the control module is electrically connected to the scan signal output module and the reference current module. The control module is also used to obtain the scan time corresponding to the scan phase from the scan signal output module, so as to control the pre-charging time of the pre-charging module for the current mirror module according to the scan time, and to obtain the voltage required by the reference current module to write to the sub-pixel circuit from the reference current module, so as to control the pre-charging voltage output by the pre-charging module according to the voltage.

[0107] In another possible implementation, the control module is electrically connected to the scan signal output module and the reference current module. The control module is further configured to send the scan time to the scan signal output module and the required voltage to be written to the sub-pixel circuit, based on the scan time corresponding to the scan stage obtained from an external source and the required voltage to be written to the sub-pixel circuit. The control module controls the pre-charging time of the pre-charging module for the current mirror module based on the scan time, and controls the pre-charging voltage output by the pre-charging module based on the voltage.

[0108] In another possible implementation, the control module can also be used to obtain the scan time corresponding to the scan phase from the scan signal output module, and send the voltage required for writing to the sub-pixel circuit obtained from the outside to the reference current module. Alternatively, the control module can also be used to send the scan time obtained from the outside to the scan signal output module, and obtain the voltage required for writing to the sub-pixel circuit from the reference current module.

[0109] The method provided in this application embodiment pre-charges the sub-pixel circuits using an externally connected control module based on the charging voltage used to charge the sub-pixel circuits before scanning them in the display panel. This allows the sub-pixel circuits to complete charging faster after pre-charging, thereby accelerating the charging speed of the sub-pixel circuits, reducing the compressed light emission time of the light-emitting devices, and improving the display quality of the display panel.

[0110] Continuing from Figures 1 and 2 above, Figure 11 is a schematic diagram of the operating timing of another display panel provided in this application. As shown in Figure 11, during the light-emitting stage, when the enable signals output by the PWM module change from the fourth level to the third level to extinguish the light-emitting devices corresponding to each enable signal, the enable signal immediately changes from the fourth level to the third level, while the anode voltage of the light-emitting device corresponding to each enable signal decreases slowly, and its corresponding anode current (for example, I_Va1_1 in Figure 11 is the anode current of the light-emitting device corresponding to sub-pixel 1_1) also decreases slowly, causing the light-emitting device to fail to extinguish immediately.

[0111] Furthermore, since the current mirror circuit is used to modulate the operating current of the light-emitting device, the grayscale modulation of the light-emitting device is determined by the enable signal output by the PWM module of the sub-pixel. When the path between the current mirror module and the light-emitting device is cut off, the light-emitting device is affected by its self-discharge phenomenon, which leads to a slow change in current in the light-emitting device. This results in a deviation in the grayscale brightness control of the sub-pixel, further affecting the low display quality of the display panel.

[0112] Therefore, this application can also use an externally connected control module to output a reset control signal to the sub-pixel circuit at the cut-off time when the paths of the light-emitting devices in multiple pixels of the display panel are cut off at the same time, so as to reset the anode voltage of the light-emitting device in the sub-pixel circuit, accelerate the speed at which the anode voltage of the light-emitting device drops, thereby improving the brightness response speed and contrast of the display panel, and thus improving the display quality of the display panel.

[0113] Figure 12 is a schematic diagram of another display panel provided in an embodiment of this application. As shown in Figure 12, the display panel further includes a PWM module, and the pixel includes multiple sub-pixel circuits and light-emitting devices electrically connected to each sub-pixel circuit.

[0114] This control module is used to output a reset control signal to the sub-pixel circuit at the end of the display cycle of the display panel, so as to control the light-emitting devices in the sub-pixel circuit to reset quickly and achieve rapid shutdown.

[0115] The PWM module is connected to the control module and the light-emitting device respectively, and can generate PWM signals based on the control commands of the control module to adjust the brightness of the light-emitting device and realize the periodic display of the display panel.

[0116] Specifically, the control terminal of the PWM module is connected to the second output terminal of the control module, the first terminal is connected to the anode of the light-emitting device, and the second terminal is connected to the power supply terminal of the light-emitting device.

[0117] The control module can be, for example, a processor, microprocessor, or control circuit of the display panel; any circuit or electronic component capable of performing its control function is acceptable, and this application does not impose any restrictions. The reset control signal is used to provide a negative voltage to the light-emitting device when the light-emitting device cuts off the path, enabling rapid discharge of the accumulated charge on the anode of the light-emitting device, thereby accelerating the extinguishing speed of the light-emitting device and completing the reset of the light-emitting device.

[0118] Optionally, the control module can control the reset control signal to maintain a first level based on the scanning signal of the display panel through timing coordination, so as to control whether the sub-pixel circuit resets the light-emitting device. For example, the control module can determine the time of the scanning phase when scanning the display panel with the scanning signal, and perform timing coordination based on the time of the scanning phase to control the level of the reset control signal when the display panel needs to be reset and when it does not need to be reset. For example, when the display panel needs to be reset, the reset control signal can be controlled to maintain a first level, so as to control the sub-pixel circuit to reset the light-emitting device before the start of the display cycle and at the end of the display cycle. When the display panel does not need to be reset, the reset control signal can be switched to a second level to stop the reset. The first level can be lower than the second level, or the first level can be higher than the second level. The correlation between the level of the reset control signal and the indication of whether the sub-pixel circuit performs a reset behavior can be set according to actual needs, and this application does not limit it.

[0119] Alternatively, the control module can adjust whether to output a reset control signal through timing coordination to control whether the sub-pixel circuit resets the light-emitting device. For example, the control module can output a reset control signal when a reset is required and stop outputting the reset control signal when a reset is not required, thereby controlling whether the sub-pixel circuit resets the light-emitting device.

[0120] Taking the control module's timing coordination to adjust the level of the reset control signal to control whether the sub-pixel circuit resets the light-emitting device as an example, this reset control signal is synchronized with the control signal that controls the light-emitting device to light up or turn off (i.e., the enable signal output by the PWM module). That is, the timing of the reset control signal is coordinated according to the timing of this control signal to determine its own timing. The phase of the reset control signal and the control signal can be in phase or out of phase. This reset control signal can be used to simultaneously reset the light-emitting devices in multiple pixels.

[0121] Specifically, when the path to the light-emitting device is cut off, the control signal disconnects the path, and simultaneously, the reset control signal output by the control module controls the sub-pixel circuit to output a negative voltage to the anode of the light-emitting device, which can quickly discharge the accumulated charge on the anode, thereby accelerating the extinguishing speed of the light-emitting device and completing the reset of the light-emitting device. For example, assuming the anode potential of the light-emitting device is between 1V and 1.2V when emitting light, the negative voltage output by the sub-pixel circuit to the anode of the light-emitting device, which can quickly extinguish the light-emitting device, could be, for example, -0.7V. This negative voltage can quickly discharge the accumulated charge on the anode of the light-emitting device, thereby accelerating the extinguishing speed of the light-emitting device.

[0122] Optionally, the sub-pixel circuit may include, for example, the current mirror circuit shown in FIG2 above, or other pixel circuits that control the conduction or disconnection of the light-emitting device by the enable signal output by the PWM module. This application does not limit this.

[0123] In one possible implementation, the control module is also used to output a reset control signal to the sub-pixel circuit before the light-emitting devices of all pixels in the display panel emit light, so as to reset the light-emitting devices of the sub-pixel circuit, to ensure that the light-emitting devices of each pixel remain in an off state before the control signal controls the light emission, and to prevent the light-emitting devices from emitting light prematurely.

[0124] Optionally, the reset control signal is a global reset control signal, meaning all sub-pixel circuits in the display panel are in a uniform shutdown mode. In other words, the reset control signal can reset the light-emitting devices corresponding to all sub-pixel circuits in the display panel; that is, for all sub-pixel circuits in the display panel, the corresponding reset control signal is the same. The uniform shutdown mode for all sub-pixel circuits in the display panel means that the turn-off time of all sub-pixel circuits in the display panel is the same.

[0125] This application provides a display panel in which, when the path of the light-emitting device in multiple pixels of the display panel is cut off, an externally connected control module outputs a reset control signal to the sub-pixel circuit when the path of the light-emitting device is cut off, so that the sub-pixel circuit resets the anode voltage of the light-emitting device, quickly discharges the accumulated charge on the anode of the light-emitting device, and accelerates the extinguishing speed of the light-emitting device, thereby improving the brightness response speed and contrast of the display panel, and thus improving the display quality of the display panel.

[0126] Figure 13 is a schematic diagram of another display panel provided in an embodiment of this application. As shown in Figure 13, the sub-pixel circuit includes a reset module.

[0127] The input terminal of the reset module is connected to the first output terminal of the control module, the output terminal is connected to the anode of the light-emitting device, and the cathode of the light-emitting device is connected to the ELVSS.

[0128] The reset module is used to output a reset signal to the light-emitting device according to the reset control signal output by the control module. The reset signal is used to reset the anode of the light-emitting device, so as to realize the rapid turn-off of the light-emitting device.

[0129] The reset signal is the negative voltage used to reset the light-emitting device as described in the embodiment corresponding to Figure 12. The reset module determines whether to output a reset signal based on the level of the reset control signal output by the control module. When the level of the reset control signal indicates that the reset module should output a reset signal, the reset module outputs the reset signal to the anode of the light-emitting device, so that the anode of the light-emitting device can be reset according to the reset signal.

[0130] The following section provides a detailed introduction to the aforementioned PWM module and the relationship between the control module and the PWM module.

[0131] This PWM module controls the illumination and extinguishing of a light-emitting device (LED) based on its illumination duration. The PWM module can switch the power supply circuit of the LED on or off according to the illumination duration to control its illumination. For example, at the beginning of the illumination duration, the PWM module controls the power supply circuit to be turned on, allowing the power supply terminal to supply power to the LED, causing it to illuminate. At the end of the illumination duration (i.e., when the path to the LED is cut off), the PWM module controls the power supply circuit to be turned off, stopping the power supply terminal from supplying power to the LED, causing it to extinguish.

[0132] The PWM module outputs pulses of a specific period based on the light-emitting time of the light-emitting device, which serve as an enable signal to control the opening and closing of the fifth switch, thereby controlling the conduction and disconnection of the power supply circuit of the light-emitting device.

[0133] Alternatively, the PWM module can be any other module capable of outputting an enable signal. Based on the light-emitting time of the light-emitting device, at the beginning of the light-emitting time, an enable signal is output to control the power supply circuit of the light-emitting device to be turned on. The switch closes according to the enable signal, so that the power supply terminal supplies power to the light-emitting device, causing the light-emitting device to emit light. When the light-emitting device's path is cut off, an enable signal is output to control the power supply circuit of the light-emitting device to be turned off. The switch closes according to the enable signal, so that the power supply terminal stops supplying power to the light-emitting device, causing the light-emitting device to turn off.

[0134] In one possible implementation, the emission time is sent from the control module to the PWM module. In this implementation, the control module is also used to acquire the emission time of the light-emitting device and send it to the PWM module. This emission time can be obtained externally by the control module, for example, by determining the emission time of the light-emitting device corresponding to each sub-pixel within each pixel based on the emission requirements of each pixel corresponding to the received image information. The control module can synchronize this emission time with the PWM module via a pin connected to the PWM module. After receiving the emission time, the PWM module controls the light-emitting device to emit or extinguish according to the emission time.

[0135] In another possible implementation, the emission time is sent to the PWM module by a module other than the control module. In this implementation, the control module is also used to obtain the emission time from the PWM module. This emission time can be, for example, obtained externally by the PWM module (e.g., received). The PWM module controls the emission of the light-emitting device to light up or turn off based on the received emission time of the light-emitting device corresponding to the sub-pixel circuit. The control module can obtain this emission time from the PWM module through a pin connected to the PWM module. Based on the obtained emission time, the control module determines how to output a reset control signal according to the aforementioned method to reset the light-emitting device.

[0136] In any of the above implementation methods, for example, taking the reset control signal controlling the reset module to stop outputting the reset signal with a low level and the reset control signal controlling the reset module to output the reset signal with a high level as an example, the explanation of how the reset control signal controls the reset module to reset the light-emitting device is provided.

[0137] Before any light-emitting device electrically connected to the sub-pixel circuit begins to emit light, the reset control signal changes from low to high. The reset module stops outputting the reset signal when the reset control signal is high. Since the reset signal is essentially a negative voltage, if the reset module does not stop outputting the reset signal before the light-emitting device emits light, it will affect the light emission of the light-emitting device, for example, causing the grayscale of the light-emitting device to differ from the expected grayscale, or the brightness to be lower than the expected brightness. Therefore, before any light-emitting device in any pixel of the display panel begins to emit light, the control module needs to change the reset control signal from low to high to stop the reset module from outputting the reset signal, thus avoiding any impact on the light emission of the light-emitting device.

[0138] When the path to the light-emitting device is cut off, the reset control signal changes from high to low, and the reset module outputs a reset signal when the reset control signal is low. When the path to the light-emitting device is cut off, all light-emitting devices in the display panel need to be immediately turned off. The control module controls the reset module to output a reset signal by changing the output reset control signal from high to low. This negative voltage of the reset signal accelerates the reduction of the anode voltage of the light-emitting device to the potential range corresponding to the device being off, thereby shortening the time it takes for the light-emitting device to turn off, reducing the problem of not being able to turn off immediately due to self-discharge of the light-emitting device, and improving the brightness response speed and contrast of the display panel.

[0139] Continuing with the example where the reset control signal controls the reset module to stop outputting the reset signal at a low level, and the reset control signal controls the reset module to output the reset signal at a high level, Figure 14 is a schematic diagram of another display panel structure provided in an embodiment of this application. As shown in Figure 14, the reset module includes: a second switch and a reset power supply submodule.

[0140] The first end of the second switch is connected to the second output end of the control module, the second end is connected to the anode of the light-emitting device, and the third end is connected to the output end of the reset power supply submodule.

[0141] The reset power supply submodule is used to output a reset signal.

[0142] The second switch is used to connect the reset power supply submodule and the light-emitting device when the reset control signal changes from high level to low level, and to connect the reset power supply submodule and the light-emitting device when the reset control signal changes from low level to high level.

[0143] The reset power supply submodule can be, for example, a linear regulated power supply module, a switching power supply module, a charge pump power supply module, or any other power supply module capable of outputting a negative voltage. For instance, taking a charge pump power supply module as the reset power supply submodule, the charge pump power supply module can utilize an internal capacitor array and switching network to achieve voltage conversion. The charge pump power supply module periodically switches the switches, charging and discharging the capacitors to gradually increase or decrease the voltage. For example, the charge pump power supply module can employ a cross-coupled capacitor structure, where two sets of capacitors work alternately. When one set of capacitors charges, the other set discharges. By controlling the order in which the capacitors are connected to the input voltage and ground, and utilizing charge transfer between the capacitors, the positive voltage is converted into a negative voltage output.

[0144] The second switch, based on the level shift of the reset control signal output by the control module, either opens or closes the path between the reset power supply submodule and the light-emitting device. When the path between the reset power supply submodule and the light-emitting device is opened, the reset signal output by the reset power supply submodule can reset the anode potential of the light-emitting device; when the path between the reset power supply submodule and the light-emitting device is closed, the reset signal output by the reset power supply submodule can stop resetting the anode potential of the light-emitting device.

[0145] Optionally, the second switch can be an NMOS switch, a PMOS switch, or a CMOS switch. When the second switch is an NMOS switch, the first terminal connected to the second output terminal of the control module is the gate of the switch.

[0146] During the operation of a light-emitting device, when it begins to emit light, its anode potential gradually rises until it reaches the light-on voltage, at which point the device will emit light. However, if the voltage difference between the anode potential and the light-on voltage is large, the time required for the anode potential to rise is longer, resulting in a slow current response speed. Therefore, to address this issue, the reset power supply submodule in the display panel provided in this application can further improve the current response speed of the light-emitting device when it begins to emit light by controlling the level of the output reset signal.

[0147] Figure 15 is a schematic diagram of the working timing of another display panel provided in an embodiment of this application. As shown in Figure 15, before any light-emitting device electrically connected to the sub-pixel circuit starts to emit light (i.e., before the enable signal in the PWM module outputs the control signal to close the loop between the light-emitting device and the power supply terminal, or at the moment when the PWM module outputs the enable signal to close the loop between the light-emitting device and the power supply terminal), the reset signal output by the reset power supply submodule changes from low voltage to high voltage.

[0148] Among them, the high voltage is less than the start-up voltage of the light-emitting device, which is the voltage that makes the light-emitting device start to emit light.

[0149] The reset power supply submodule adjusts the anode potential of the light-emitting device before it starts emitting light to a potential with a smaller voltage difference between the current and the start-up voltage by increasing the voltage of the reset signal. This reduces the time it takes for the potential to rise to the start-up voltage when the light-emitting device starts emitting light, thereby accelerating the current response speed of the light-emitting device, improving the start-up speed of the light-emitting device, and thus improving the screen response speed of the display panel.

[0150] After all the light-emitting devices in a pixel emit light, the reset signal output by the reset power supply submodule changes from high voltage to low voltage. Since these devices need to be extinguished when their path is cut off, if the reset signal output by the reset power supply module remains high, it will fail to reach the negative voltage required to reset the anode potential of the light-emitting devices. This results in the devices failing to reset, reducing the rate of anode descent when the path is cut off, thus decreasing the brightness response time, contrast ratio, and display quality of the display panel. Therefore, after all the light-emitting devices in a pixel emit light, the reset power supply submodule can change the output reset signal back from high voltage to low voltage. This low voltage reset signal can meet the requirement of resetting the anode potential when the path is cut off, increasing the rate of anode descent and improving the brightness response time, contrast ratio, and display quality of the display panel.

[0151] For example, Figure 16 is a schematic diagram of the operating timing of another display panel provided in an embodiment of this application. As shown in Figure 16, the reset power supply submodule outputs a low-voltage reset signal before the light-emitting phase (i.e., before the start of the display cycle of the display panel). At the start of the light-emitting phase (i.e., at the start of the display cycle of the display panel), the output reset signal is changed from low voltage to high voltage. Before the PWM module stops outputting the enable signal that controls the loop closure between the light-emitting device and the power supply terminal (i.e., before the end of the display cycle of the display panel), the reset power supply submodule changes the output reset signal from high voltage back to low voltage again to avoid the high-voltage reset signal affecting the reset of the light-emitting device. This allows the reset signal to quickly discharge the accumulated charge on the anode of the light-emitting device through the low voltage (i.e., the aforementioned negative voltage), thereby improving the extinguishing speed of the light-emitting device.

[0152] In one possible implementation, the reset signal is maintained at a high voltage until after the start of the lowest grayscale pulse in the display panel and before the end of the display cycle. The lowest grayscale pulse is the pulse output by the PWM module corresponding to grayscale 1 (Gray 1), which is the narrowest pulse among the pulses corresponding to grayscales 0-255. Since the reset signal is a global reset signal used for all sub-pixel circuits in the display panel, and the grayscale of the light-emitting devices corresponding to each sub-pixel circuit is different within the display cycle, the reset signal needs to cover the sub-pixel circuits of all light-emitting devices corresponding to all grayscale levels to satisfy the reset function of all light-emitting devices in the display panel. Therefore, by maintaining the reset signal at a high voltage until after the start of the lowest grayscale pulse in the display panel and before the end of the display cycle, and then switching to a low voltage thereafter, it is ensured that when all light-emitting devices in the display panel are turned off, the high-voltage reset signal can improve the turn-off speed of all light-emitting devices in the display panel.

[0153] In addition, an overvoltage protection module can be set in the sub-pixel circuit to keep the voltage changes in the sub-pixel circuit within the rated voltage range, thus protecting the sub-pixel circuit.

[0154] Figure 17 is a schematic diagram of another display panel provided in an embodiment of this application. As shown in Figure 17, the sub-pixel circuit further includes: a first overvoltage protection module.

[0155] The first terminal of the first overvoltage protection module is connected to the first terminal of the PWM module, and the second terminal is connected to the anode of the light-emitting device.

[0156] The first overvoltage protection module is used to prevent the devices in the sub-pixel circuit from exceeding the preset operating voltage range (i.e., the rated voltage range).

[0157] When the sub-pixel circuit is a low-voltage sub-pixel circuit, the sub-pixel circuit in the display panel is affected by the reset voltage, causing the anode potential of the light-emitting device to change beyond the low-voltage range corresponding to the sub-pixel circuit. If the anode potential of the light-emitting device changes beyond the low-voltage range corresponding to the sub-pixel circuit, the components (such as switching transistors) within the sub-pixel circuit may be at risk of breakdown. Therefore, this first overvoltage protection module can prevent the components within the sub-pixel circuit from exceeding the preset operating voltage range, thereby ensuring the circuit safety of the sub-pixel circuit and improving the stability of the display panel.

[0158] The first overvoltage protection module may include, for example, a voltage-crossing resistor. Optionally, the voltage-crossing resistor may be, for example, a normally open MOSFET, a resistor, or a diode, etc., and this application does not limit the application in this regard.

[0159] Figure 18 is a schematic diagram of another display panel provided in an embodiment of this application. As shown in Figure 18, the sub-pixel circuit further includes a second overvoltage protection module.

[0160] The first end of the second overvoltage protection module is connected to the output end of the reference current module, and the second end is connected to the second input end of the current mirror module.

[0161] The second overvoltage protection module is used to prevent the components in the sub-pixel circuit from exceeding the preset operating voltage range.

[0162] When the sub-pixel circuit operates in the low-voltage domain, the MOSFETs in the sub-pixel circuit are low-voltage transistors. Since the anode voltage of the light-emitting device needs to decrease when the light-emitting device is turned off, the voltage across the anode voltage of the light-emitting device increases, potentially exceeding the maximum withstand voltage of the MOSFETs corresponding to these device nodes (e.g., the third and fourth switching transistors in Figure 2). Therefore, this second overvoltage protection module prevents the devices in the sub-pixel circuit from exceeding the preset operating voltage range (e.g., the voltage across any two ends of the MOSFET does not exceed the maximum withstand voltage of the MOSFET itself), ensuring the circuit safety of the sub-pixel circuit and thus improving the stability of the display panel.

[0163] The second overvoltage protection module may include, for example, a transvoltage resistor. Optionally, the transvoltage resistor may be, for example, a normally open MOSFET, a resistor, or a diode, etc., and this application does not limit the application in this regard.

[0164] For ease of understanding, the following are exemplary schematic diagrams of the sub-pixel circuits in two display panels.

[0165] Figure 19 is a schematic diagram of another display panel provided in an embodiment of this application. The sub-pixel circuit in this display panel is a circuit using a common N-contact process, that is, all the switching transistors in the sub-pixel circuit are NMOS switching transistors. As shown in Figure 19, the display panel includes a sub-pixel circuit, a light-emitting device electrically connected to the sub-pixel circuit, a scan signal output module, a reference current module, and a control module. The sub-pixel circuit of the display panel includes: a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, a fifth NMOS transistor, a sixth NMOS transistor, a seventh NMOS transistor, a capacitor, a first resistor, a second resistor, and an enable signal output unit.

[0166] In this configuration, the first NMOS transistor corresponds to the aforementioned first switch transistor, and the corresponding second, third, fourth, and fifth NMOS transistors correspond to the aforementioned second, third, fourth, and fifth switch transistors, respectively. The capacitor corresponds to the aforementioned capacitor. The first resistor is the first overvoltage protection module in Figure 17, and the second resistor is the second overvoltage protection module in Figure 18. The enable signal output unit is a PWM module, used to control the light-emitting device's illumination and deactivation by outputting an enable signal. The sixth NMOS transistor corresponds to the first switch in Figure 7, and the seventh NMOS transistor corresponds to the second switch in Figure 14.

[0167] The technical effects of the above modules and devices are similar to those of the display panel in the previous embodiments, and will not be described again here.

[0168] Figure 20 is a schematic diagram of another display panel provided in an embodiment of this application. The sub-pixel circuit in this display panel is a circuit using a common P-contact process, that is, all the switching transistors in the sub-pixel circuit are PMOS switching transistors. As shown in Figure 20, the display panel includes a sub-pixel circuit, a light-emitting device electrically connected to the sub-pixel circuit, a scan signal output module, a reference current module, and a control module. The sub-pixel circuit of the display panel includes: a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a fifth PMOS transistor, a sixth PMOS transistor, a seventh PMOS transistor, a capacitor, a first resistor, a second resistor, and an enable signal output unit.

[0169] In Figure 20, the first to seventh PMOS transistors function similarly to the first to seventh NMOS transistors in Figure 19, differing only in the type of MOS transistors. The remaining modules and devices have similar technical effects to the display panel in the embodiment of Figure 19, the only difference being that the sub-pixel circuit in Figure 20 is a mirror image of the sub-pixel circuit in the embodiment of Figure 19, which will not be described further here.

[0170] Optionally, the sub-pixel circuits included in the display panel provided in this application may all be sub-pixel circuits using the common N-contact process as shown in Figure 19 above, or they may all be sub-pixel circuits using the common P-contact process as shown in Figure 20 above, or the display panel may simultaneously include sub-pixel circuits using the common N-contact process and sub-pixel circuits using the common P-contact process.

[0171] Figure 21 is a flowchart illustrating a display panel control method according to an embodiment of this application. The execution entity of this method can be the aforementioned control module. As shown in Figure 21, the display panel includes multiple pixels arranged in rows and columns, a control module, and each pixel includes multiple sub-pixel circuits. Each sub-pixel circuit includes a current mirror module that provides a stable driving current to the light-emitting devices of the sub-pixel circuit based on a reference current. The method includes:

[0172] S101. Based on the charging voltage of the sub-pixel circuit, obtain the pre-charging voltage for controlling the sub-pixel circuit to pre-charge the current mirror module.

[0173] S102. Based on the pre-charge voltage, control the sub-pixel circuit to pre-charge the current mirror module.

[0174] Optionally, based on the charging voltage of the sub-pixel circuit, a pre-charging voltage for controlling the sub-pixel circuit to pre-charge the current mirror module is obtained, including:

[0175] Obtain the mapping relationship between charging voltage and pre-charging voltage;

[0176] Based on the charging voltage and the mapping relationship, the pre-charging voltage is obtained.

[0177] Optionally, the mapping relationship includes the charging voltage and the pre-charging voltage corresponding to the charging voltage, or the mapping relationship includes a preset voltage difference, wherein the pre-charging voltage is determined based on the charging voltage and the preset voltage difference.

[0178] The display panel control method provided in this application embodiment can be executed by the control module in the above-mentioned display panel. Its implementation principle and technical effect are similar, and will not be described again here.

[0179] On the other hand, this application also provides an electronic device, which includes the display panel shown in any of the foregoing embodiments. The technical effects of the electronic device are similar to those of the foregoing display panel, and will not be described again here.

[0180] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0181] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A display panel, characterized in that, The display panel includes multiple pixels arranged in rows and columns and a control module. Each pixel includes multiple sub-pixel circuits. Each sub-pixel circuit includes a current mirror module that provides a stable driving current for the light-emitting devices of the sub-pixel circuit based on a reference current. The control module and the sub-pixel circuit are electrically connected; The control module is configured to control the sub-pixel circuit to pre-charge the current mirror module before scanning the sub-pixel circuit, wherein the pre-charging voltage is related to the charging voltage used to charge the current mirror module of the sub-pixel circuit.

2. The display panel according to claim 1, characterized in that, The pre-charge voltage is greater than the charging voltage, or the pre-charge voltage is less than the charging voltage.

3. The display panel according to claim 2, characterized in that, The sub-pixel circuit includes: a pre-charging module; The input terminal of the pre-charge module is connected to the first output terminal of the control module, and the output terminal is connected to the input terminal of the current mirror module. The pre-charge module is used to output a pre-charge voltage according to the pre-charge indication signal output by the control module, and the pre-charge voltage is used to pre-charge the current mirror module.

4. The display panel according to claim 3, characterized in that, The control module is also used to control the voltage value of the pre-charging voltage output by the pre-charging module.

5. The display panel according to claim 4, characterized in that, The control module is specifically used to determine the pre-charge voltage based on the charging voltage when all the sub-pixel circuits have the same charging voltage.

6. The display panel according to claim 4, characterized in that, The control module is specifically used for: When the charging voltage of the sub-pixel circuits in different rows is different, the pre-charging voltage of the sub-pixel circuits in each row is determined according to the charging voltage of each row. Alternatively, the pre-charge voltage for all said sub-pixel circuits can be determined based on the minimum value among the charging voltages corresponding to at least some of the row sub-pixel circuits.

7. The display panel according to any one of claims 3-6, characterized in that, The pre-charging module includes: a first switch and a pre-charging power supply sub-module; The control terminal of the first switch is connected to the first output terminal of the control module, the second terminal is connected to the output terminal of the pre-charge power supply submodule, and the third terminal is connected to the input terminal of the current mirror module. The pre-charge power supply submodule is used to output the pre-charge voltage; The first switch is used to close the path between the pre-charge power supply submodule and the current mirror module when a pre-charge indication signal is received from the control module.

8. The display panel according to any one of claims 2-6, characterized in that, The display panel also includes a scan signal output module and a reference current module; The control module is electrically connected to the scanning signal output module and the reference current module; The control module is configured to, after obtaining the scanning time of the sub-pixel circuit from the scanning signal output module, control the sub-pixel circuit to pre-charge the current mirror module according to the scanning time before the scanning signal output module scans, wherein the pre-charging voltage is related to the charging voltage used by the reference current module to charge the current mirror module for the sub-pixel circuit.

9. The display panel according to claim 8, characterized in that, The control module is also used for: The charging voltage is acquired and sent to the reference current module; Alternatively, the charging voltage can be obtained from the reference current module.

10. The display panel according to claim 7, characterized in that, The first switch is an N-type metal-oxide-semiconductor switch, or a P-type metal-oxide-semiconductor switch, or a complementary metal-oxide-semiconductor switch.

11. The display panel according to claim 10, characterized in that, The display panel further includes a pulse width modulation (PWM) module, and the pixel includes multiple sub-pixel circuits and light-emitting devices electrically connected to each of the sub-pixel circuits. The control module is used to output a reset control signal to the sub-pixel circuit at the end of the display cycle of the display panel, so as to control the light-emitting device in the sub-pixel circuit to reset quickly and achieve rapid shutdown. The PWM module is connected to the control module and the light-emitting device respectively, and can generate PWM signals based on the control commands of the control module to adjust the brightness of the light-emitting device and realize the periodic display of the display panel.

12. The display panel according to claim 11, characterized in that, The control module is used to control the reset control signal to maintain a first level according to the scanning signal of the display panel through timing coordination, so as to control the sub-pixel circuit to reset the light-emitting device before the start of the display cycle and at the end of the display cycle.

13. The display panel according to claim 12, characterized in that, The reset control signal is a global reset control signal, and all sub-pixel circuits in the display panel are in a unified shutdown mode.

14. The display panel according to claim 13, characterized in that, The control terminal of the PWM module is connected to the second output terminal of the control module, the first terminal is connected to the anode of the light-emitting device, and the second terminal is connected to the power supply terminal of the light-emitting device.

15. The display panel according to claim 14, characterized in that, The sub-pixel circuit includes: a reset module; The input terminal of the reset module is connected to the first output terminal of the control module, and the output terminal is connected to the anode of the light-emitting device. The reset module is used to output a reset signal to the light-emitting device according to the reset control signal output by the control module. The reset signal is used to reset the light-emitting device and realize the rapid shutdown of the light-emitting device.

16. The display panel according to any one of claims 11-15, characterized in that, The control module is also used to switch the maintained first level to the second level before the start of the display cycle, and at the same time switch the reset signal from low voltage to high voltage, and switch it from high voltage to low voltage before the end of the display cycle, so as to reduce the voltage difference across the light-emitting device and improve the lighting speed of the light-emitting device.

17. The display panel according to claim 16, characterized in that, The reset signal maintains the high voltage until after the lowest grayscale pulse in the display panel begins and before the display cycle ends.

18. The display panel according to claim 17, characterized in that, The sub-pixel circuit also includes an overvoltage protection module; The overvoltage protection module is used to keep the voltage change in the sub-pixel circuit within the rated voltage range, thereby protecting the sub-pixel circuit.

19. The display panel according to claim 18, characterized in that, The control module is also used to acquire the light emission time of the light-emitting device and send the light emission time to the PWM module; Alternatively, the emission time can be obtained from the PWM module.

20. The display panel according to claim 19, characterized in that, The reset module includes a second switch and a reset power supply submodule; The first end of the second switch is connected to the output end of the control module, the second end is connected to the anode of the light-emitting device, and the third end is connected to the output end of the reset power supply submodule. The reset power supply submodule is used to output the reset signal; The second switch is used to connect the path between the reset power supply submodule and the light-emitting device when the reset control signal changes from a second level to a first level, and to disconnect the path between the reset power supply submodule and the light-emitting device when the reset control signal changes from a first level to a second level.

21. The display panel according to claim 20, characterized in that, The second switch is an N-type metal-oxide-semiconductor switch, or a P-type metal-oxide-semiconductor switch, or a complementary metal-oxide-semiconductor switch.

22. The display panel according to claim 21, characterized in that, The overvoltage protection module includes: a first overvoltage protection module, and / or a second overvoltage protection module; The first terminal of the first overvoltage protection module is connected to the first terminal of the PWM module, and the second terminal is connected to the anode of the light-emitting device; The first end of the second overvoltage protection module is connected to the output end of the reference current module, and the second end is connected to the second input end of the current mirror module.

23. The display panel according to any one of claims 17-22, characterized in that, The sub-pixel circuit adopts a common N-contact process and / or a common P-contact process; the first sub-pixel circuit using the common N-contact process and the second sub-pixel circuit using the common P-contact process are mirror images of each other.

24. A method for controlling a display panel, characterized in that, The display panel includes multiple pixels arranged in rows and columns and a control module. Each pixel includes multiple sub-pixel circuits. Each sub-pixel circuit includes a current mirror module that provides a stable driving current for the light-emitting devices of the sub-pixel circuit based on a reference current. Based on the charging voltage of the sub-pixel circuit, obtain the pre-charging voltage that controls the sub-pixel circuit to pre-charge the current mirror module; Based on the pre-charge voltage, the sub-pixel circuit is controlled to pre-charge the current mirror module.

25. The method according to claim 24, characterized in that, The pre-charge voltage is greater than the charging voltage, or the pre-charge voltage is less than the charging voltage.

26. The method according to claim 25, characterized in that, The step of obtaining the pre-charging voltage for controlling the sub-pixel circuit to perform pre-charging based on the charging voltage of the sub-pixel circuit includes: Obtain the mapping relationship between the charging voltage and the pre-charging voltage; The pre-charge voltage is obtained based on the charging voltage and the mapping relationship.

27. The method according to claim 26, characterized in that, The mapping relationship includes the charging voltage and the pre-charging voltage corresponding to the charging voltage; or, The mapping relationship includes a preset voltage difference, and the pre-charge voltage is determined based on the charging voltage and the preset voltage difference.

28. An electronic device, characterized in that, The electronic device includes a display panel as claimed in any one of claims 1-23.

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