Display panel control method and control device

Abstract

The present application provides a display panel control method and control device, characterized in that they are applied to an organic light-emitting display (OLED) panel. The method includes: obtaining the current brightness and refresh rate of the display panel; if the current refresh rate of the display panel is less than a preset value and the current brightness is less than a first brightness threshold, reducing the drive current of the display panel; if the current refresh rate of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, increasing the drive current of the display panel, wherein the second brightness threshold is greater than the first brightness threshold. The method provided by the present application helps to solve the problem of brightness fluctuation of the display panel during low-frequency display and improve the display effect under low-frequency conditions.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a control method and a control device for a display panel. Background Art

[0002] Organic Light-Emitting Diode (OLED) display panels use different display frequencies in different application scenarios. For example, a higher-frequency drive mode is used to display dynamic images to ensure smoothness, while a lower-frequency drive mode is used to display slow-motion images or static images to reduce power consumption.

[0003] Currently, OLED display panels have the problem of brightness fluctuation in low-frequency display. Summary of the Invention

[0004] The present application provides a control method and a control device for a display panel, which help to solve the problem of brightness fluctuation of the display panel during low-frequency display.

[0005] In a first aspect, the present application provides a control method for a display panel, which is applied to an organic light-emitting display (OLED) panel, including: obtaining the current brightness and refresh frequency of the display panel; if the current refresh frequency of the display panel is less than a preset value and the current brightness is less than a first brightness threshold, reducing the driving current of the display panel; if the current refresh frequency of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, increasing the driving current of the display panel, and the second brightness threshold is greater than the first brightness threshold.

[0006] In one possible implementation, reducing the driving current of the display panel includes reducing a high-level power supply voltage PVDD of the display panel; and increasing the driving current of the display panel includes increasing the high-level power supply voltage PVDD of the display panel.

[0007] In one possible implementation, the method further includes: obtaining a current display cycle of the display panel, the current display cycle including a valid frame and an invalid frame, the valid frame being a frame in which data is written to the pixel driving circuit, and the invalid frame being a frame in which data is not written to the pixel driving circuit; lowering the high-level power supply voltage PVDD of the display panel includes: lowering the high-level power supply voltage PVDD of the display panel in part of the frames of the display cycle according to the current brightness of the display panel; and increasing the high-level power supply voltage PVDD of the display panel includes: increasing the high-level power supply voltage PVDD of the display panel in part of the frames of the display cycle according to the current brightness of the display panel.

[0008] In one possible implementation, lowering the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel includes: determining a corresponding compensation value according to the current brightness of the display panel, and lowering the high-level power supply voltage PVDD of the display panel in some frames of the display cycle; and increasing the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel includes: determining a corresponding compensation value according to the current brightness of the display panel, and increasing the high-level power supply voltage PVDD of the display panel in some frames of the display cycle.

[0009] In one possible implementation, determining a corresponding compensation value according to the current brightness of the display panel and reducing the high-level power supply voltage PVDD of the display panel in part of the frames of the display period includes:

[0010] Determining a corresponding compensation frame and a compensation value corresponding to the compensation frame according to the current brightness of the display panel, and reducing the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period; determining the corresponding compensation value according to the current brightness of the display panel and increasing the high-level power supply voltage PVDD of the display panel in some frames of the display period includes: determining a corresponding compensation frame and a compensation value corresponding to the compensation frame according to the current brightness of the display panel, and increasing the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period.

[0011] In one possible implementation manner, the compensation frame and the compensation value corresponding to the compensation frame are determined based on a preset mapping relationship, where the preset mapping relationship includes a correspondence between brightness, the compensation frame, and the compensation value.

[0012] In one possible implementation manner, if the display period consists of one valid frame and one invalid frame, the compensation frame is the invalid frame or the valid frame.

[0013] In one possible implementation manner, if the display period consists of one valid frame and two invalid frames, the compensation frame is any two of the one valid frame and the two invalid frames.

[0014] In one possible implementation, the preset mapping relationship is obtained based on a test method for the display panel, and the test method includes: obtaining a high-level power supply voltage PVDD of the display panel in each frame in the same display cycle at different brightness; at the same brightness; if the current brightness is less than the first brightness threshold, the frame with the lowest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a correspondence between the current brightness, the compensation frame and the compensation value is established; if the current brightness is greater than the second brightness threshold, the frame with the highest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a correspondence between the current brightness, the compensation frame and the compensation value is established.

[0015] In a second aspect, a control device for a display panel includes:

[0016] an acquisition module, configured to acquire the current brightness and refresh rate of the display panel;

[0017] a reducing module configured to reduce a driving current of the display panel if a current refresh frequency of the display panel is less than a preset value and the current brightness is less than a first brightness threshold;

[0018] An increasing module is used to increase the driving current of the display panel if the current refresh frequency of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, and the second brightness threshold is greater than the first brightness threshold.

[0019] In one possible implementation, the reducing module is further used to reduce the driving current of the display panel, including reducing the high-level power supply voltage PVDD of the display panel; the increasing module is further used to increase the driving current of the display panel, including increasing the high-level power supply voltage PVDD of the display panel.

[0020] In one possible implementation, the acquisition module is further used to acquire the current display cycle of the display panel, the current display cycle including valid frames and invalid frames, the valid frames being frames in which data is written to the pixel driving circuit, and the invalid frames being frames in which data is not written to the pixel driving circuit; the reduction module is further used to reduce the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel; the increase module is further used to increase the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel.

[0021] In one possible implementation, the reduction module is further used to determine a corresponding compensation value based on the current brightness of the display panel, and reduce the high-level power supply voltage PVDD of the display panel in some frames of the display cycle; the increase module is further used to determine a corresponding compensation value based on the current brightness of the display panel, and increase the high-level power supply voltage PVDD of the display panel in some frames of the display cycle.

[0022] In one possible implementation, the reduction module is further used to determine the corresponding compensation frame and the compensation value corresponding to the compensation frame according to the current brightness of the display panel, and reduce the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period; the increase module is further used to determine the corresponding compensation frame and the compensation value corresponding to the compensation frame according to the current brightness of the display panel, and increase the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period.

[0023] In one possible implementation manner, the compensation frame and the compensation value corresponding to the compensation frame are determined based on a preset mapping relationship, where the preset mapping relationship includes a correspondence between brightness, the compensation frame, and the compensation value.

[0024] In one possible implementation manner, if the display period consists of one valid frame and one invalid frame, the compensation frame is the invalid frame or the valid frame.

[0025] In one possible implementation manner, if the display period consists of one valid frame and two invalid frames, the compensation frame is any two of the one valid frame and the two invalid frames.

[0026] In one possible implementation, the control device further includes a test module, which is used to obtain the high-level power supply voltage PVDD of the display panel in each frame in the same display cycle under different brightness; under the same brightness; if the current brightness is less than the first brightness threshold, the frame with the lowest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a correspondence between the current brightness, the compensation frame and the compensation value is established; if the current brightness is greater than the second brightness threshold, the frame with the highest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a correspondence between the current brightness, the compensation frame and the compensation value is established.

[0027] As described above, the control method and control device of a display panel provided by the present application have at least the following beneficial technical effects:

[0028] The present application provides a display panel control method and control device, which are applied to an organic light-emitting display (OLED) panel. The method includes: obtaining the current brightness and refresh rate of the display panel; if the current refresh rate of the display panel is less than a preset value and the current brightness is less than a first brightness threshold, reducing the drive current of the display panel; if the current refresh rate of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, increasing the drive current of the display panel, where the second brightness threshold is greater than the first brightness threshold. The method provided by the present application helps to solve the problem of brightness fluctuation of the display panel during low-frequency display, thereby improving the display effect under low-frequency conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic flow chart of a method for controlling a display panel provided in an embodiment of the present application;

[0030] Figure 2 A schematic flow chart of a method for reducing brightness of a display panel provided in an embodiment of the present application;

[0031] Figure 3 A schematic flow chart of a method for increasing the brightness of a display panel provided in an embodiment of the present application;

[0032] Figure 4 A schematic structural diagram of a pixel circuit provided in an embodiment of the present application;

[0033] Figure 5 Provided in the embodiments of this application Figure 4An operating timing diagram of the pixel circuit shown;

[0034] Figure 6 Provided in the embodiments of this application Figure 4 Another working timing diagram of the pixel circuit shown;

[0035] Figure 7 A schematic structural diagram of a display panel control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] In the embodiments of this application, unless otherwise specified, the character " / " indicates that the associated objects are in an "or" relationship. For example, A / B can represent A or B. "And / or" describes the relationship between the associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exists simultaneously, or B exists alone.

[0037] It should be pointed out that the words "first", "second", etc. involved in the embodiments of this application are only used for distinguishing description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor can they be understood as indicating or implying order.

[0038] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. In addition, "at least one of the following" or similar expressions refers to any combination of these items, which may include any combination of single items or plural items. For example, at least one of A, B, or C can represent: A, B, C, A and B, A and C, B and C, or A, B and C. Among them, each of A, B, and C can be an element itself, or a set containing one or more elements.

[0039] In the embodiments of this application, the terms "exemplary," "in some embodiments," and "in another embodiment" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" in this application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner.

[0040] In the embodiments of this application, the terms "of," "corresponding," and "relevant" may sometimes be used interchangeably. It should be noted that, when the distinction between them is not emphasized, the meanings they convey are the same. In the embodiments of this application, the terms "communication" and "transmission" may sometimes be used interchangeably. It should be noted that, when the distinction between them is not emphasized, the meanings they convey are the same. For example, "transmission" may include "sending" and / or "receiving," and may be either a noun or a verb.

[0041] In the embodiments of this application, "equal to" can be used in conjunction with "greater than" and is applicable to the technical solution adopted when "greater than" is used, and can also be used in conjunction with "less than" and is applicable to the technical solution adopted when "less than" is used. It should be noted that when "equal to" is used in conjunction with "greater than", it cannot be used in conjunction with "less than"; and when "equal to" is used in conjunction with "less than", it cannot be used in conjunction with "greater than".

[0042] The display panel in this application may be an organic light emitting diode (OLED) panel, or other types of display panels.

[0043] Optionally, an embodiment of the present application proposes a control method for a display panel, which is applied to an OLED panel.

[0044] Now combined Figure 1-Figure 3 The control method of the display panel provided in the embodiment of the present application is described.

[0045] like Figure 1 FIG2 is a flow chart of an embodiment of a method for controlling a display panel provided by the present application, which specifically includes the following steps:

[0046] Step S110: Acquire the current brightness and refresh rate of the display panel.

[0047] Specifically, an embodiment of the present application proposes to automatically detect the light brightness of the environment in which the display panel is located through a device. The embodiment of the present application does not impose any specific restrictions on the method of detecting the light brightness of the environment described by the display panel, and then transmits the brightness to the driver chip. The embodiment of the present application does not impose any specific restrictions on this transmission method.

[0048] Optionally, the current brightness of the display panel provided in the embodiments of the present application can be understood as the brightness of the entire display panel. Different voltages are required to present the same level of chromaticity under different ambient brightness. Specifically, the display panel can display different brightnesses in different environments. For example, when the current brightness is high, the display panel displays a higher brightness, while when the current brightness is low, the display panel displays a lower brightness. Based on the above, the current brightness of the display panel is obtained.

[0049] Optionally, the embodiments of the present application propose to obtain the refresh frequency of the display panel. It is understandable that the embodiments of the present application propose to obtain the refresh frequency of the display panel through a refresh frequency monitoring module. The refresh frequency of the display panel refers to the number of times the display panel can be refreshed per second, and the refresh frequency of the display panel can be divided into a high refresh frequency and a low refresh frequency. A display panel with a high refresh frequency can reduce blur and smearing in dynamic images, making fast-moving objects appear clearer. A display panel with a low refresh frequency will cause the display panel to be brighter at low brightness and darker at high brightness due to leakage.

[0050] Step S120: if the current refresh rate of the display panel is less than a preset value and the current brightness is less than a first brightness threshold, reducing the driving current of the display panel;

[0051] Specifically, the embodiments of the present application propose that if the current refresh rate of the display panel is less than a preset value and the current brightness is less than a first brightness threshold, the driving current of the display panel is reduced. For example, the preset value can be 45HZ. When the current refresh rate of the display panel is less than 45HZ, the current refresh rate of the display panel is a low refresh rate. The first brightness threshold can be 50nit. The embodiments of the present application can change the first brightness threshold according to different actual usage scenarios. The embodiments of the present application do not impose specific restrictions on the value of this first brightness threshold. Then, when the current brightness of the display panel is less than 50nit, the driving current of the display panel is reduced, so that the brightness of the display panel with a low refresh rate is lower when it is less than the first brightness threshold, thereby reducing the brightness fluctuation problem caused by leakage current.

[0052] Furthermore, in some optional embodiments of the present application, such as Figure 2 As shown, the display control method of the display panel provided in the embodiment of the present application further includes: S121 to S124, S121, reducing the driving current of the display panel includes reducing the high-level power supply voltage PVDD of the display panel.

[0053] Specifically, the embodiments of the present application propose that, when the current brightness of the display panel is less than a first brightness threshold, the driving current of the display panel is reduced by reducing the high-level power supply voltage PVDD of the display panel, and accordingly, the current brightness of the display panel at low brightness is reduced. Furthermore, the method of dynamically reducing the high-level power supply voltage PVDD may include optimizing the power management circuit, designing a more efficient power management circuit to reduce the high-level power supply voltage PVDD, adjusting the bias voltage in the circuit to reduce the high-level power supply voltage PVDD according to the specifications and requirements of the display panel, or reducing the high-level power supply voltage PVDD by improving the circuit design, such as using a logic circuit and driver IC with a lower supply voltage. The embodiments of the present application do not specifically limit the method of reducing the high-level power supply voltage PVDD.

[0054] S122 , obtaining a current display period of the display panel, and reducing the high-level power supply voltage PVDD of the display panel in part of the frames of the display period according to the current brightness of the display panel.

[0055] Specifically, the embodiment of the present application proposes to obtain the current display cycle of the display panel, and reduce the high-level power supply voltage PVDD of the display panel in part of the frame of the display cycle according to the current brightness of the display panel. Figure 5 and Figure 6 As shown, a display cycle may include one or more valid frames and one or more invalid frames, where a valid frame is a frame in which data is written to the pixel driving circuit, and an invalid frame is a frame in which data is not written to the pixel driving circuit. When the current brightness of the display panel is less than a first brightness threshold, the high-level power supply voltage PVDD of the display panel is reduced in some frames of the display cycle according to the current brightness of the display panel, thereby reducing the driving current of the display panel, thereby correspondingly reducing the current brightness of the display panel.

[0056] Furthermore, the embodiments of the present application propose that by lowering the high-level power supply voltage PVDD of the display panel in part of the frames of the display cycle, the following steps may be included: if the display cycle consists of a valid frame and an invalid frame, obtaining the corresponding first high-level power supply voltage in the valid frame and the corresponding second high-level power supply voltage in the invalid frame, comparing the first high-level power supply voltage with the second high-level power supply voltage, and if the first high-level power supply voltage is lower than the second high-level power supply voltage, using the valid frame as the compensation frame and the first high-level power supply voltage as the compensation value to compensate the second high-level power supply voltage to the first high-level power supply voltage; if the second high-level power supply voltage is lower than the first high-level power supply voltage, using the invalid frame as the compensation frame and the second high-level power supply voltage as the compensation value to compensate the first high-level power supply voltage to the second high-level power supply voltage.

[0057] Optionally, if a display cycle consists of one valid frame and two invalid frames, wherein the invalid frames include a first invalid frame and a second invalid frame, a first high-level power supply voltage corresponding to the valid frame, a second high-level power supply voltage corresponding to the first invalid frame, and a third high-level power supply voltage corresponding to the second invalid frame are obtained, and the first high-level power supply voltage, the second high-level power supply voltage, and the third high-level power supply voltage are compared. If the first high-level power supply voltage is the lowest, the valid frame is used as the compensation frame, the first high-level power supply voltage is used as the compensation value, and the second high-level power supply voltage and the third high-level power supply voltage are compensated to the first high-level power supply voltage; if the second high-level power supply voltage is the lowest, the first invalid frame is used as the compensation frame, the second high-level power supply voltage is used as the compensation value, and the first high-level power supply voltage and the third high-level power supply voltage are compensated to the second high-level power supply voltage; if the third high-level power supply voltage is the lowest, the second invalid frame is used as the compensation frame, the third high-level power supply voltage is used as the compensation value, and the first high-level power supply voltage and the second high-level power supply voltage are compensated to the third high-level power supply voltage.

[0058] S123 , determining a corresponding compensation value according to the current brightness of the display panel, and reducing the high-level power supply voltage PVDD of the display panel in part of the frames of the display period.

[0059] Specifically, the embodiments of the present application propose to determine a corresponding compensation value based on the current brightness of the display panel through testing in advance. The method for determining the compensation value is as described in step S122. It can be understood that when the current refresh rate of the display panel is less than a preset value and the current brightness is lower than a first brightness threshold, there is a preset mapping relationship between the current brightness, the compensation value, and the compensation frame. The preset mapping relationship includes the correspondence between brightness, compensation frame, and compensation value.

[0060] Furthermore, the embodiments in the present application propose that the preset mapping relationship is obtained by a testing method, and the testing method includes: obtaining the high-level power supply voltage PVDD of the display panel in each frame in the same display cycle at different brightness; at the same brightness; if the current brightness is less than the first brightness threshold, then the frame with the lowest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a corresponding relationship between the current brightness, the compensation frame and the compensation value is established.

[0061] That is, the corresponding compensation value is determined by the current brightness of the display panel, and the high-level power supply voltage PVDD of the display panel is reduced in some frames of the display cycle, thereby reducing the driving current of the display panel and correspondingly reducing the current brightness of the display panel.

[0062] S124 , determining a corresponding compensation frame and a compensation value corresponding to the compensation frame according to the current brightness of the display panel, and reducing the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period.

[0063] Specifically, the embodiments of the present application propose determining a corresponding compensation frame and a compensation value corresponding to the compensation frame based on the current brightness of the display panel, and reducing the high-level power supply voltage PVDD of the display panel during the compensation frame of the display cycle. It can be understood that, through a preset mapping relationship, the corresponding compensation frame and the compensation value corresponding to the compensation frame are determined according to the current brightness of the display panel. Furthermore, the corresponding compensation frame and the compensation value corresponding to the compensation frame are determined based on the current brightness of the display panel, and the high-level power supply voltage PVDD of the display panel is reduced during the compensation frame of the display cycle, thereby reducing the drive current of the display panel and correspondingly reducing the current brightness of the display panel.

[0064] In step S130 , if the current refresh frequency of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, the driving current of the display panel is increased.

[0065] Specifically, the embodiments of the present application propose that if the current refresh rate of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, the driving current of the display panel is increased. For example, the preset value can be 45HZ. When the current refresh rate of the display panel is less than 45HZ, the current refresh rate of the display panel is a low refresh rate; the second brightness threshold can be 150nit. The embodiments of the present application can change the second brightness threshold according to different actual usage scenarios. The embodiments of the present application do not impose specific restrictions on the value of the second brightness threshold. Then, when the current brightness of the display panel is greater than 150nit, the driving current of the display panel is increased, so that the display panel with a low refresh rate has a higher brightness when the brightness is greater than the second brightness threshold, thereby reducing the brightness fluctuation problem caused by leakage current.

[0066] Furthermore, in some optional embodiments of the present application, such as Figure 2 As shown, the display control method of the display panel provided in the embodiment of the present application further includes: S131 to S134, S131, increasing the driving current of the display panel includes increasing the high-level power supply voltage PVDD of the display panel.

[0067] Specifically, the embodiments of the present application propose that, when the current brightness of the display panel is greater than a second brightness threshold, the driving current of the display panel is increased by increasing the high-level power supply voltage PVDD of the display panel, and accordingly, the current brightness of the display panel at low brightness is increased. Furthermore, the method of dynamically increasing the high-level power supply voltage PVDD may include optimizing the power management circuit, designing a more efficient power management circuit to increase the high-level power supply voltage PVDD, adjusting the bias voltage in the circuit to increase the high-level power supply voltage PVDD according to the specifications and requirements of the display panel, or improving the circuit design, such as using a logic circuit and driver IC with a lower supply voltage to increase the high-level power supply voltage PVDD. The embodiments of the present application do not specifically limit the method of increasing the high-level power supply voltage PVDD.

[0068] S132 , obtaining a current display period of the display panel, and increasing a high-level power supply voltage PVDD of the display panel in a portion of frames of the display period according to the current brightness of the display panel.

[0069] Specifically, the embodiment of the present application proposes to obtain the current display cycle of the display panel, and increase the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel. Figure 5 and Figure 6 As shown, a display cycle may include one valid frame and one or more invalid frames, where a valid frame is a frame in which data is written to the pixel driving circuit, and an invalid frame is a frame in which data is not written to the pixel driving circuit. When the current brightness of the display panel is greater than a second brightness threshold, the high-level power supply voltage PVDD of the display panel is increased in some frames of the display cycle according to the current brightness of the display panel, thereby increasing the drive current of the display panel, thereby correspondingly increasing the current brightness of the display panel.

[0070] Furthermore, the embodiments of the present application propose increasing the high-level power supply voltage PVDD of the display panel in some frames of the display cycle, which may include, if the display cycle consists of a valid frame and an invalid frame, obtaining the corresponding first high-level power supply voltage in the valid frame and the corresponding second high-level power supply voltage in the invalid frame, comparing the first high-level power supply voltage with the second high-level power supply voltage, and if the first high-level power supply voltage is higher than the second high-level power supply voltage, using the valid frame as the compensation frame and the first high-level power supply voltage as the compensation value to compensate the second high-level power supply voltage to the first high-level power supply voltage; if the second high-level power supply voltage is higher than the first high-level power supply voltage, using the invalid frame as the compensation frame and the second high-level power supply voltage as the compensation value to compensate the first high-level power supply voltage to the second high-level power supply voltage.

[0071] Optionally, if a display cycle consists of one valid frame and two invalid frames, wherein the invalid frames include a first invalid frame and a second invalid frame, a first high-level power supply voltage corresponding to the valid frame, a second high-level power supply voltage corresponding to the first invalid frame, and a third high-level power supply voltage corresponding to the second invalid frame are obtained, and the first high-level power supply voltage, the second high-level power supply voltage, and the third high-level power supply voltage are compared. If the first high-level power supply voltage is the highest, the valid frame is used as the compensation frame, the first high-level power supply voltage is used as the compensation value, and the second high-level power supply voltage and the third high-level power supply voltage are compensated to the first high-level power supply voltage; if the second high-level power supply voltage is the highest, the first invalid frame is used as the compensation frame, the second high-level power supply voltage is used as the compensation value, and the first high-level power supply voltage and the third high-level power supply voltage are compensated to the second high-level power supply voltage; if the third high-level power supply voltage is the highest, the second invalid frame is used as the compensation frame, the third high-level power supply voltage is used as the compensation value, and the first high-level power supply voltage and the second high-level power supply voltage are compensated to the third high-level power supply voltage.

[0072] S133 , determining a corresponding compensation value according to the current brightness of the display panel, and increasing the high-level power supply voltage PVDD of the display panel in part of the frames of the display period.

[0073] Specifically, the embodiments of the present application propose to determine the corresponding compensation value based on the current brightness of the display panel in advance through testing. The method for determining the compensation value is as described in step S132. It can be understood that when the current refresh rate of the display panel is less than a preset value and the current brightness is higher than a second brightness threshold, there is a preset mapping relationship between the current brightness, the compensation value, and the compensation frame. The preset mapping relationship includes the correspondence between brightness, compensation frame, and compensation value.

[0074] Furthermore, the embodiments in the present application propose that the preset mapping relationship is obtained by a testing method, which includes: obtaining the high-level power supply voltage PVDD of the display panel in each frame in the same display cycle at different brightness; at the same brightness; if the current brightness is greater than the second brightness threshold, then the frame with the highest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a corresponding relationship between the current brightness, the compensation frame and the compensation value is established.

[0075] That is, the corresponding compensation value is determined by the current brightness of the display panel, and the high-level power supply voltage PVDD of the display panel is increased in some frames of the display cycle, thereby increasing the driving current of the display panel and correspondingly increasing the current brightness of the display panel.

[0076] S134 , determining a corresponding compensation frame and a compensation value corresponding to the compensation frame according to the current brightness of the display panel, and increasing the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period.

[0077] Specifically, the embodiments of the present application propose determining a corresponding compensation frame and a compensation value corresponding to the compensation frame based on the current brightness of the display panel, and increasing the high-level power supply voltage PVDD of the display panel during the compensation frame of the display cycle. It can be understood that, through a preset mapping relationship, the corresponding compensation frame and the compensation value corresponding to the compensation frame are determined according to the current brightness of the display panel. Furthermore, the corresponding compensation frame and the compensation value corresponding to the compensation frame are determined based on the current brightness of the display panel, and the high-level power supply voltage PVDD of the display panel is increased during the compensation frame of the display cycle, thereby increasing the drive current of the display panel and correspondingly increasing the current brightness of the display panel.

[0078] The display panel control method provided in the embodiments of the present application can achieve lower brightness at low brightness levels and higher brightness at high brightness levels for low-frequency display panels. The display panel's drive current is increased or decreased by increasing or decreasing the high-level power supply voltage PVDD of the display panel. This helps resolve the issue of brightness fluctuations in the display panel during low-frequency display, improving the display quality at low frequencies.

[0079] Figure 4 This is a circuit diagram of a pixel circuit provided by an embodiment of the present invention. The pixel circuit includes a driving transistor M3 and a light-emitting element. The driving transistor M3 and the light-emitting element are sequentially connected between a high-level power supply voltage line PVDD and a low-level power supply voltage line PVEE. Figure 4 The pixel circuit further includes a storage capacitor C1, a data writing transistor M2, a compensation transistor M4, a first initialization transistor M5, a second initialization transistor M7, a first light emission control transistor M1 and a second light emission control transistor M6.

[0080] The first electrode of the first emission control transistor M1 is connected to the high-level power supply voltage line PVDD, and the second electrode of the first emission control transistor M1 is connected to the first electrode (e.g., source electrode) of the drive transistor M3. The second electrode (e.g., drain electrode) of the drive transistor M3 is connected to the first electrode of the second emission control transistor M6. The second electrode of the second emission control transistor M6 is connected to the first electrode (anode) of the light-emitting element, and the second electrode (cathode) of the light-emitting element is connected to the low-level power supply voltage line PVEE. The gates of the first emission control transistor M1 and the second emission control transistor M6 are both connected to the emission control signal line. The storage capacitor C1 is connected between the first electrode of the first emission control transistor M1 and the gate of the drive transistor M3. The first electrode of the data write transistor M2 is connected to the data signal line, the second electrode of the data write transistor M2 is connected to the first electrode of the drive transistor T3, and the gate of the data write transistor M2 is connected to the scan signal line SP. The compensation transistor M4 is connected between the gate and second electrode of the drive transistor M3, and the gate of the compensation transistor M4 is connected to the second scan control signal line SN2. A first electrode of the first initialization transistor M5 is connected to the gate of the driving transistor M3, and the gate of the first initialization transistor M5 is connected to the first scan signal line SN1. A first electrode of the second initialization transistor M7 is connected to the first electrode of the light-emitting element, and the gate of the second initialization transistor M7 is connected to the scan signal line SP. A second electrode of the first initialization transistor M5 is connected to the first initialization signal line Vref1, and a second electrode of the second initialization transistor M7 is connected to the second initialization signal line Vref2.

[0081] Figure 5 yes Figure 4 An operating timing diagram of a pixel circuit is shown, wherein a display cycle may include a display cycle consisting of an active frame and an inactive frame. Each active frame phase and inactive frame phase includes an inactive pulse of the light-emitting control signal EMIT, and the inactive pulse duration of the light-emitting control signal EMIT during the active frame phase and the inactive frame phase is the same. An active frame is a frame in which data is written to the pixel driver circuit, and an inactive frame is a frame in which data is not written to the pixel driver circuit.

[0082] Figure 6 yes Figure 4 Another operating timing diagram of the pixel circuit shown, wherein a display cycle can include a display cycle consisting of one active frame and two inactive frames, each active frame phase and inactive frame phase includes an inactive pulse of the light emitting control signal EMIT, and the inactive pulse duration of the light emitting control signal EMIT in the active frame phase and the inactive frame phase is the same. An active frame is a frame in which data is written to the pixel driving circuit, and an inactive frame is a frame in which data is not written to the pixel driving circuit.

[0083] Based on the same inventive concept, an embodiment of the present invention also provides a control device for a display panel, which can be used to control the display brightness of the image displayed by the display panel. The control device for the display panel is implemented in the form of hardware and / or software, and the control device for the display panel can be integrated into the driver chip of the display device. Figure 7 FIG. 7 is a schematic structural diagram of a display panel control device 70 provided in an embodiment of the present invention. Figure 7 As shown, the control device 70 of the display panel includes:

[0084] An acquisition module 71 is configured to acquire the current brightness and refresh rate of the display panel;

[0085] a reducing module 72 configured to reduce a driving current of the display panel if a current refresh frequency of the display panel is less than a preset value and the current brightness is less than a first brightness threshold;

[0086] The increasing module 73 is used to increase the driving current of the display panel if the current refresh frequency of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, and the second brightness threshold is greater than the first brightness threshold.

[0087] In one possible implementation, the reducing module 72 is further used to reduce the driving current of the display panel, including reducing the high-level power supply voltage PVDD of the display panel; the increasing module 73 is further used to increase the driving current of the display panel, including increasing the high-level power supply voltage PVDD of the display panel.

[0088] In one possible implementation, the acquisition module 71 is also used to acquire the current display cycle of the display panel, and the current display cycle includes a valid frame and an invalid frame, the valid frame is a frame in which data is written to the pixel driving circuit, and the invalid frame is a frame in which data is not written to the pixel driving circuit; the reduction module 72 is also used to reduce the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel; the increase module 73 is also used to increase the high-level power supply voltage PVDD of the display panel in some frames of the display cycle according to the current brightness of the display panel.

[0089] In one possible implementation, the reducing module 72 is further used to determine a corresponding compensation value according to the current brightness of the display panel, and to reduce the high-level power supply voltage PVDD of the display panel in some frames of the display cycle; the increasing module 73 is further used to determine a corresponding compensation value according to the current brightness of the display panel, and to increase the high-level power supply voltage PVDD of the display panel in some frames of the display cycle.

[0090] In one possible implementation, the reducing module 72 is further used to determine the corresponding compensation frame and the compensation value corresponding to the compensation frame according to the current brightness of the display panel, and to reduce the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period; the increasing module 73 is further used to determine the corresponding compensation frame and the compensation value corresponding to the compensation frame according to the current brightness of the display panel, and to increase the high-level power supply voltage PVDD of the display panel in the compensation frame of the display period.

[0091] In one possible implementation manner, the compensation frame and the compensation value corresponding to the compensation frame are determined based on a preset mapping relationship, where the preset mapping relationship includes a correspondence between brightness, the compensation frame, and the compensation value.

[0092] In one possible implementation manner, if the display period consists of one valid frame and one invalid frame, the compensation frame is the invalid frame or the valid frame.

[0093] In one possible implementation manner, if the display period consists of one valid frame and two invalid frames, the compensation frame is any two of the one valid frame and the two invalid frames.

[0094] In one possible implementation, the control device 70 also includes a testing module 74, which is used to obtain the high-level power supply voltage PVDD of the display panel in each frame in the same display cycle under different brightness; under the same brightness; if the current brightness is less than the first brightness threshold, the frame with the lowest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a corresponding relationship between the current brightness, the compensation frame and the compensation value is established; if the current brightness is greater than the second brightness threshold, the frame with the highest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a corresponding relationship between the current brightness, the compensation frame and the compensation value is established.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a display panel, characterized in that: Applied to an organic light-emitting display (OLED) panel, the method includes: Obtaining the current brightness and refresh rate of the display panel; If the current refresh frequency of the display panel is less than a preset value, and the current brightness is less than a first brightness threshold, reducing the driving current of the display panel; If the current refresh frequency of the display panel is less than a preset value and the current brightness is greater than a second brightness threshold, the driving current of the display panel is increased, and the second brightness threshold is greater than the first brightness threshold.

2. The method according to claim 1, characterized in that The method further comprises: The reducing the driving current of the display panel comprises reducing the high-level power supply voltage PVDD of the display panel; The increasing the driving current of the display panel includes increasing the high-level power supply voltage PVDD of the display panel.

3. The method according to claim 1, characterized in that Also includes: Acquire a current display cycle of the display panel, where the current display cycle includes a valid frame and an invalid frame, where the valid frame is a frame in which data is written into a pixel driving circuit, and the invalid frame is a frame in which data is not written into the pixel driving circuit; The step of reducing the high-level power supply voltage PVDD of the display panel comprises: reducing the high-level power supply voltage PVDD of the display panel in part of the frames of the display period according to the current brightness of the display panel; Increasing the high-level power supply voltage PVDD of the display panel includes: According to the current brightness of the display panel, the high-level power supply voltage PVDD of the display panel is increased in part of the frames of the display period.

4. The method according to claim 3, characterized in that The step of reducing the high-level power supply voltage PVDD of the display panel in a portion of the frames of the display period according to the current brightness of the display panel comprises: determining a corresponding compensation value according to the current brightness of the display panel, and reducing the high-level power supply voltage PVDD of the display panel in part of the frames of the display period; The step of increasing the high-level power supply voltage PVDD of the display panel in a portion of the frames of the display period according to the current brightness of the display panel comprises: A corresponding compensation value is determined according to the current brightness of the display panel, and a high-level power supply voltage PVDD of the display panel is increased in a portion of the frames of the display period.

5. The method according to claim 4, characterized in that The step of determining a corresponding compensation value according to the current brightness of the display panel and reducing the high-level power supply voltage PVDD of the display panel in a portion of the frames of the display period comprises: determining a corresponding compensation frame and a compensation value corresponding to the compensation frame according to the current brightness of the display panel, and reducing a high-level power supply voltage PVDD of the display panel in the compensation frame of the display period; The step of determining a corresponding compensation value according to the current brightness of the display panel and increasing the high-level power supply voltage PVDD of the display panel in a portion of the frames of the display period comprises: A corresponding compensation frame and a compensation value corresponding to the compensation frame are determined according to the current brightness of the display panel, and a high-level power supply voltage PVDD of the display panel is increased in the compensation frame of the display period.

6. The method according to claim 5, characterized in that The compensation frame and the compensation value corresponding to the compensation frame are determined based on a preset mapping relationship, where the preset mapping relationship includes a correspondence between brightness, the compensation frame, and the compensation value.

7. The method according to claim 5, characterized in that If the display period consists of one valid frame and one invalid frame, the compensation frame is the invalid frame or the valid frame.

8. The method according to claim 5, characterized in that If the display period consists of one valid frame and two invalid frames, the compensation frame is any two of the one valid frame and the two invalid frames.

9. The method according to claim 6, characterized in that The preset mapping relationship is obtained based on a test method for the display panel, and the test method includes: Obtaining a high-level power supply voltage PVDD of the display panel in each frame in the same display cycle at different brightness levels; At the same brightness; If the current brightness is less than the first brightness threshold, the frame with the lowest PVDD in the same display period is used as the standard frame, the frames in the same display period other than the standard frame are used as the compensation frames corresponding to the current brightness, and the PVDD deviation between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a corresponding relationship between the current brightness, the compensation frame and the compensation value is established; If the current brightness is greater than the second brightness threshold, the frame with the highest PVDD in the same display cycle is used as the standard frame, and the frames other than the standard frame in the same display cycle are used as the compensation frames corresponding to the current brightness, and the PVDD deviation value between the compensation frame and the standard frame is used as the compensation value corresponding to the current brightness, and a corresponding relationship between the current brightness, the compensation frame and the compensation value is established.

10. A control device for a display panel, characterized in that: include: A processor and a memory storing computer program instructions, wherein the processor implements the control method of the display panel according to any one of claims 1 to 9 when executing the computer program instructions.

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