Display panel, method for adjusting light-emitting power supply voltage therein, and display device

Abstract

A display panel, a method for regulating the light-emitting power supply voltage therein, and a display device. The display panel includes a plurality of light-emitting elements, a timing control circuit, and a light-emitting power supply circuit. The timing control circuit is configured to send an output voltage update instruction to the light-emitting power supply circuit via a data transmission terminal and provide a trigger indication signal to a trigger signal output terminal. The trigger indication signal is used to indicate the image refresh interval within the display frame of the display panel. The light-emitting power supply circuit is configured to receive the output voltage update instruction via a data reception terminal and, based on the trigger indication signal from the trigger signal input terminal, execute an output voltage update operation corresponding to the output voltage update instruction within the image refresh interval. This method can help solve the problem of severe display defects caused by the application of a light-emitting power supply voltage regulation solution.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a method for adjusting a light-emitting power supply voltage therein, and a display device. Background Art

[0002] In electroluminescent display devices, such as OLEDs (Organic Light-Emitting Diodes), QLEDs (Quantum Dot Light-Emitting Diodes), and micro-LEDs, the light-emitting elements are generally the most power-intensive component of the display device. To reduce the overall power consumption of the display device, some solutions have attempted to provide different light-emitting power supply voltages to all light-emitting elements in different application scenarios. These solutions reduce overall power consumption by automatically adjusting the brightness of the entire screen. However, in the actual application of these solutions, it has been found that electroluminescent display devices experience irregular screen flickering or sudden changes in brightness after the automatic adjustment is initiated, indicating that the application of these solutions can lead to serious display defects. Summary of the Invention

[0003] The present application provides a display panel and a method for adjusting the light-emitting power supply voltage therein, and a display device, which can help solve the problem of serious display defects caused by the application of a light-emitting power supply voltage adjustment solution.

[0004] One aspect of the present application provides a display panel, which includes: a plurality of light-emitting elements located in a display area, and a timing control circuit and a light-emitting power supply circuit located outside the display area; wherein, the voltage output end of the light-emitting power supply circuit is connected to the plurality of light-emitting elements, the data sending end of the timing control circuit is connected to the data receiving end of the light-emitting power supply circuit, and the trigger signal output end of the timing control circuit is connected to the trigger signal input end of the light-emitting power supply circuit; the timing control circuit is configured to send an output voltage update instruction to the light-emitting power supply circuit through the data sending end, and to provide a trigger indication signal to the trigger signal output end, wherein the trigger indication signal is used to indicate a picture refresh interval period within a display frame of the display panel; the light-emitting power supply circuit is configured to receive the output voltage update instruction through the data receiving end, and to perform an output voltage update operation corresponding to the output voltage update instruction within the picture refresh interval period according to the trigger indication signal of the trigger signal input end.

[0005] In some possible implementations, the trigger indication signal is a pulse signal indicating the start time of the picture refresh interval period within the display frame, and the light-emitting power supply circuit is configured to perform the output voltage update operation within a predetermined time period after the start time of the picture refresh interval period.

[0006] In some possible implementations, the voltage output terminal of the light-emitting power supply circuit includes a positive voltage output terminal and a negative voltage output terminal, and the negative voltage output terminal of the light-emitting power supply circuit is connected to the cathodes of the plurality of light-emitting elements; the light-emitting power supply circuit is configured as follows:

[0007] In response to the received output voltage update instruction, m output voltage update operations are added to the operation queue; wherein each output voltage update operation is an operation of changing the voltage value of the output voltage of the negative voltage output terminal by a step voltage value, m is a positive integer, and the value of m is the quotient of the target voltage change and the step voltage value, and the target voltage change is the difference between the target voltage value and the current voltage value of the output voltage of the negative voltage output terminal of the light-emitting power supply circuit;

[0008] When an electric pulse indicating the start time of the current display frame in the trigger indication signal arrives, determining whether there is the output voltage update operation to be executed in the operation queue;

[0009] When there are the output voltage update operations to be executed in the operation queue, executing the output voltage update operations in the operation queue one by one within the predetermined time period after the start time;

[0010] When a predetermined time period has elapsed after the start time, if there are still output voltage update operations to be executed in the operation queue, the execution of the output voltage update operations in the operation queue is suspended one by one.

[0011] In some possible implementations, the output voltage update instruction includes the value of m and a voltage change direction identifier, and the timing control circuit is configured to determine the value of m and the voltage change direction identifier based on the target voltage value, the absolute value of the step voltage value, and the target voltage value corresponding to the previous output voltage update instruction when generating the output voltage update instruction, and the absolute value of the step voltage value is a constant value pre-configured in the timing control circuit and the light-emitting power supply circuit; or,

[0012] The output voltage update instruction includes the target voltage value, and the light emitting power supply circuit is configured to determine the value of m and the voltage change direction of the output voltage update operation to be added based on the target voltage value, the current output voltage value of the negative voltage output terminal of the light emitting power supply circuit, and the absolute value of the step voltage value when receiving the output voltage update instruction, wherein the absolute value of the step voltage value is a constant value pre-configured in the light emitting power supply circuit; or

[0013] The output voltage update instruction includes the target voltage value and the absolute value of the step voltage value. The light-emitting power supply circuit is configured to determine the value of m and the step voltage value of the output voltage update operation to be added based on the target voltage value, the absolute value of the step voltage value, and the voltage value of the output voltage of the current negative voltage output terminal of the light-emitting power supply circuit when receiving the output voltage update instruction.

[0014] In some possible implementations, the trigger indication signal is a pulse signal indicating the start time of the screen refresh interval period in the display frame, and the timing control circuit is configured to generate the trigger indication signal based on a frame synchronization signal.

[0015] In some possible implementations, the display panel also includes a gamma circuit located outside the display area, the timing control circuit is connected to the gamma circuit, and the timing control circuit is configured to control the gamma reference voltage update operation performed by the gamma circuit to be synchronized with the output voltage update operation performed by the light-emitting power supply circuit.

[0016] In some possible implementations, a data transmitting end of the timing control circuit is connected to a data receiving end of the light-emitting power supply circuit via an integrated circuit data bus.

[0017] In some possible implementations, the display panel also includes a power management circuit and at least one other power-consuming component, wherein the power management circuit is respectively connected to the timing control circuit and each of the other power-consuming components, and the power management circuit is configured to supply power to the timing control circuit and the at least one other power-consuming component.

[0018] Another aspect of the present application provides a method for adjusting a light-emitting power supply voltage in a display panel, the display panel comprising: a plurality of light-emitting elements located in a display area, and a timing control circuit and a light-emitting power supply circuit located outside the display area; a voltage output terminal of the light-emitting power supply circuit is connected to the plurality of light-emitting elements, a data transmitting terminal of the timing control circuit is connected to a data receiving terminal of the light-emitting power supply circuit, and a trigger signal output terminal of the timing control circuit is connected to a trigger signal input terminal of the light-emitting power supply circuit; the method comprising:

[0019] The timing control circuit sends an output voltage update instruction to the light-emitting power supply circuit through the data sending end, and provides a trigger indication signal to the trigger signal output end, wherein the trigger indication signal is used to indicate an image refresh interval period within a display frame of the display panel;

[0020] The light-emitting power supply circuit receives the output voltage update instruction through the data receiving end, and performs an output voltage update operation corresponding to the output voltage update instruction within the screen refresh interval according to the trigger indication signal of the trigger signal input end.

[0021] Another aspect of the present application provides a display device, which includes any one of the above-mentioned display panels.

[0022] It can be seen that in each embodiment of the present application, a trigger indication signal is provided by the timing control circuit to the light-emitting power supply circuit, so that the light-emitting power supply circuit can perform the output voltage update operation within the picture refresh interval period indicated by the trigger indication signal, so that the operation of the light-emitting power supply circuit to update its output voltage occurs during the picture refresh interval period within each display frame, so that the light-emitting power supply voltage provided to the light-emitting element will not undergo sudden changes during the picture refresh process, and to a certain extent avoid the influence of the change of the light-emitting power supply voltage on the picture display effect. Therefore, it can help solve the problem of serious display defects caused by the application of the light-emitting power supply voltage adjustment scheme, and help to reduce the display power consumption and improve the display effect of related display products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 is a schematic structural diagram of a display panel in one embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of an image refresh interval of a display frame of a display panel in one embodiment of the present application;

[0026] Figure 3 is a structural diagram of yet another display panel in an embodiment of the present application;

[0027] Figure 4This is a schematic flow chart of steps for a light-emitting power supply circuit in a display panel to perform an output voltage update operation in one embodiment of the present application;

[0028] Figure 5 This is a schematic diagram of a voltage waveform when a light-emitting power supply circuit in a display panel performs an output voltage update operation in one embodiment of the present application;

[0029] Figure 6 This is a schematic flow chart of the steps of a method for adjusting the light-emitting power supply voltage in a display panel in one embodiment of the present application;

[0030] Figure 7 It is a structural schematic diagram of a display device in an embodiment of the present application.

[0031] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0033] Figure 1 FIG is a schematic diagram of the structure of a display panel in an embodiment of the present application. Figure 1 The display panel has a display area AA and includes a plurality of light-emitting elements located within the display area AA, as well as a timing control circuit 11 and a light-emitting power supply circuit 12 located outside the display area AA. The voltage output terminal Vt of the light-emitting power supply circuit 12 is connected to the plurality of light-emitting elements L0 so that the light-emitting power supply circuit 12 can provide a light-emitting power supply voltage to the plurality of light-emitting elements L0. The data transmitting terminal D1 of the timing control circuit 11 is connected to the data receiving terminal D2 of the light-emitting power supply circuit 12, and the trigger signal output terminal S1 of the timing control circuit 11 is connected to the trigger signal input terminal S2 of the light-emitting power supply circuit.

[0034] Based on the above connection relationship, the timing control circuit 11 is configured to send an output voltage update instruction to the light-emitting power supply circuit 12 through the data sending terminal D1, and to provide a trigger indication signal EN to the trigger signal output terminal S1, wherein the trigger indication signal is used to indicate the picture refresh interval period within the display frame of the display panel; the light-emitting power supply circuit 12 is configured to receive the output voltage update instruction through the data receiving terminal D2, and perform an output voltage update operation corresponding to the output voltage update instruction within the picture refresh interval period according to the trigger indication signal EN of the trigger signal input terminal S2.

[0035] Figure 2 This is a schematic diagram of an image refresh interval of a display frame of a display panel in an embodiment of the present application. Figure 2 The figure shows three consecutive display frames: the first display frame T1, the second display frame T2 and the third display frame T3, wherein each display frame has a picture refresh period T12 / T22 / T32 (wherein the picture refresh period is the period during which the display panel performs a picture refresh operation within the display frame), and each display frame has a certain length of time before and after the picture refresh period T12 / T22 / T32. Figure 2 As shown, the above-mentioned picture refresh interval period refers to the period when no picture refresh operation is performed in the display frame, so the picture refresh interval period mentioned above includes the following: Figure 2 The first intermittent period T11, the second intermittent period T21, the third intermittent period T31 and the fourth intermittent period T33 are shown. In other embodiments, the above-mentioned picture refresh intermittent period only includes the period between two adjacent picture refresh periods, such as the second intermittent period T21 and the third intermittent period T31; in addition, the above-mentioned picture refresh intermittent period may also only include the period starting at the start time of the display frame, such as the first intermittent period T11, or only include the period ending at the end time of the display frame, such as the fourth intermittent period T33.

[0036] In a comparative example, the timing control circuit 11 and the light-emitting power supply circuit 12 in the above-mentioned display panel are connected only through a bus structure without the above-mentioned trigger signal output terminal S1 or trigger signal input terminal S2. In this case, the timing control circuit 11 sends the output voltage update instruction in the form of transmission data to the light-emitting power supply circuit 12 through the bus structure in a manner with transmission delay, so as to instruct the light-emitting power supply circuit 12 to perform the corresponding output voltage update operation, thereby increasing the cross-voltage of the light-emitting power supply voltage (the difference between the positive power supply voltage and the negative power supply voltage) to increase the maximum display brightness, or reducing the cross-voltage of the light-emitting power supply voltage (the difference between the positive power supply voltage and the negative power supply voltage) to reduce power consumption. However, see Figure 2Although the timing control circuit 11 is capable of sending voltage update commands at specified times within display frames T1 / T2 / T3, the moment when the light-emitting power supply circuit 12 receives and completes the voltage update command is subject to various factors and cannot be determined. This makes it very likely that the moment when the light-emitting power supply circuit 12 performs the output voltage update operation will fall within the image refresh period T12 / T22 / T32 within the display frame (because generally speaking, the display image refresh period is the vast majority of the display frame). If the light-emitting power supply voltage is suddenly updated during the image refresh operation, there may be a significant brightness difference between the refreshed portion of the image and the portion to be refreshed. When the refreshed image overwrites the original image, there will be a brightness difference between the previous and next moments of the entire image. Viewers will experience an image that is distorted, suddenly brightens or dims, or flickers, all of which are unacceptable display defects for general display products.

[0037] Compared with the above comparative example, the embodiment of the present application sets a trigger indication signal EN provided by the timing control circuit 11 to the light emitting power supply circuit 12, so that the light emitting power supply circuit 12 can refresh the screen during the interval period (such as the interval period) indicated by the trigger indication signal EN. Figure 2 The output voltage update operation is performed within 10 seconds (in each example in the figure), so that the operation of the light-emitting power supply circuit 12 updating its output voltage occurs during the picture refresh interval within each display frame. In this way, the light-emitting power supply voltage provided to the light-emitting element L0 will not suddenly change during the picture refresh process, thereby avoiding the influence of the change of the light-emitting power supply voltage on the picture display effect to a certain extent. Therefore, it can help solve the problem of serious display defects caused by the application of the light-emitting power supply voltage adjustment solution, help reduce the power consumption of related display products and improve the display effect.

[0038] It should be noted that the light-emitting power supply voltage described in this article refers to the power supply voltage provided to the light-emitting element from outside the display area for its normal operation. In some embodiments, performing the output voltage update operation only involves updating the voltage value of one of the positive power supply voltage and the negative power supply voltage. In other embodiments, performing the output voltage update operation only involves simultaneously updating the voltage value of the positive power supply voltage and the voltage value of the negative power supply voltage. Different embodiments can change the cross-voltage of the light-emitting power supply voltage and thus adjust the maximum display brightness and display power consumption, and can be set according to actual application requirements during implementation.

[0039] It should be noted that the embodiments of the present application focus on describing the structure, connection relationship and configuration related to the supply and update of the light-emitting power supply voltage in the display panel. Those skilled in the art can realize the display panel of the embodiment of the present application by modifying the display panel in the related technology. At this time, the display panel will have additional structures, connection relationships and configurations in addition to the above description, and have a variety of different possible implementation methods.

[0040] Figure 3 FIG is a structural diagram of another display panel in an embodiment of the present application. Figure 3 In addition to the display panel Figure 1 In addition to all the structures shown, the power management circuit 13 and source driver circuit 14 outside the display area AA are also included. The source driver circuit 14 is connected to the display area AA via a number of data lines Data to implement the process of writing display data to each sub-pixel required for the screen refresh operation.

[0041] In terms of power supply, the light-emitting power supply circuit 12 and the power management circuit 13 in the display panel are respectively powered by external power (for example, by connecting to the power voltage input terminal of the interface circuit to realize external power supply), wherein the light-emitting power supply circuit 12 is responsible for providing the light-emitting power supply voltage to the plurality of light-emitting elements L0 in the display area AA, while the power management circuit 13 is responsible for supplying power to the electrical components other than the light-emitting power supply circuit 12 - for example, Figure 3 As shown, the power management circuit 13 is connected to the timing control circuit 11 and the source drive circuit 14 to supply power to them (it should be noted that, depending on the different connected electrical components, the connection lines required for power supply may be one or more). As an example of other electrical components, the power management circuit 13 can also be connected Figure 3 Common voltage lines and / or reference voltage lines not shown in the figure are used to provide common voltages and / or reference voltages required for display functions.

[0042] In terms of data transmission, the bus interface of the timing control circuit 11 (which functions as the aforementioned data transmitter D1), the bus interface of the light-emitting power supply circuit 12 (which functions as the aforementioned data receiver D2), the bus interface D3 of the power management circuit 13, and the bus interface D4 of the source driver circuit 14 are connected via an integrated circuit data bus IIC, enabling data transmission over the integrated circuit data bus. For example, the output voltage update instruction can be transmitted from the timing control circuit 11 to the light-emitting power supply circuit 12 via this bus structure. As another example, the timing control circuit 11 can transmit gamma reference voltage data to the source driver circuit 14 via this bus, and through timing control, synchronize the gamma reference voltage update operation performed by the gamma circuit (not shown) in the source driver circuit 14 with the output voltage update operation performed by the light-emitting power supply circuit 12. Based on this configuration, synchronization between the gamma voltage update operation and the output voltage update operation can be achieved, which helps to reduce the impact on the displayed image when performing these operations. The update of the light-emitting power supply voltage involves a change in the overall brightness of the image, and the gamma reference voltage also affects the overall brightness of the image. Therefore, based on the configuration and connection relationship described above, the timing control circuit 11 can synchronously adjust the gamma reference voltage and the light-emitting power supply voltage by controlling the gamma circuit and the light-emitting power supply circuit 12, so that the gamma reference voltage adapts to the synchronous changes in the light-emitting power supply voltage. In some examples, the gamma reference voltage is simply updated to a new voltage range based on the change in the cross-voltage of the light-emitting power supply voltage; in other examples, the gamma reference voltage is synchronously adjusted with the goal of minimizing the change in image brightness caused by the update of the light-emitting power supply voltage, helping to weaken the sudden changes in the displayed image at this time.

[0043] It should be noted that the timing control circuit described in this article can be implemented with reference to the timing controller (TCON) in the relevant technology or its equivalent devices, circuits, modules, chips or components. The light-emitting power supply circuit described in this article is implemented as any device, circuit, module, chip or component with corresponding functions. The power management circuit described in this article can be implemented with reference to the power management integrated circuit (PMIC) in the relevant technology or its equivalent devices, circuits, modules, chips or components. The source driver circuit described in this article can be implemented with reference to the source driver (Source Driver) in the relevant technology or its equivalent devices, circuits, modules, chips or components.

[0044] Figure 4 and Figure 5The following are respectively a flow chart of the steps of the output voltage update operation performed by a light-emitting power supply circuit in a display panel in an embodiment of the present application and a voltage waveform diagram. Here, the light-emitting power supply circuit performs the output voltage update operation by adjusting the output voltage ELVSS (i.e., the negative power supply voltage) at the negative voltage output terminal as an example for explanation. In one example, the voltage output terminal of the light-emitting power supply circuit includes a positive voltage output terminal and a negative voltage output terminal, and the negative voltage output terminal of the light-emitting power supply circuit is connected to the negative electrodes of several light-emitting elements. Figure 5 The voltage waveform examples shown introduce an exemplary step flow for a light-emitting power supply circuit in a display panel to perform an output voltage update operation.

[0045] In step 401 , in response to a received output voltage update instruction, m output voltage update operations are added to an operation queue.

[0046] Among them, each output voltage update operation is an operation of changing the voltage value of the output voltage of the negative voltage output terminal by a step voltage value, m is a positive integer, m is the quotient of the target voltage change and the step voltage value, and the target voltage change is the difference between the target voltage value and the voltage value of the output voltage of the current negative voltage output terminal of the light-emitting power supply circuit (that is, the target voltage change corresponding to each output voltage update instruction should be an integer multiple of the step voltage value).

[0047] In one example, see Figure 3 When the light emitting power supply circuit 12 receives the output voltage update instruction from the timing control circuit 11 through the data receiving terminal D2, it executes the above step 401, thereby adding m output voltage update operations to the operation queue according to the instruction of the output voltage update instruction. Figure 5 In the example, each output voltage update operation is an operation of changing the voltage value of the output voltage ELVSS of the negative voltage output terminal by a step voltage value Un. Figure 5 The target voltage value Um in the output voltage ELVSS differs from the initial value of the output voltage ELVSS by m = 5 step voltage values ​​Un. Therefore, in this example, the light emitting power supply circuit 12 adds m = 5 output voltage update operations to the operation queue in response to the voltage update instruction in step 401. As a result, there are 5 pending output voltage update operations in the operation queue before display frame T1. The operation queue can be considered an area that stores pending operations of the light emitting power supply circuit 12. In some examples, it can be an area in a storage component of the light emitting power supply circuit 12.

[0048] In step 402 , when an electric pulse indicating the start time of the picture refresh interval of the current display frame in the trigger indication signal arrives, it is determined whether there is an output voltage update operation to be executed in the operation queue.

[0049] In step 403 , when there are output voltage update operations to be executed in the operation queue, the output voltage update operations in the operation queue are executed one by one within a predetermined time period after the start time.

[0050] In step 404 , when a predetermined time period after the start time is reached, if there are still output voltage update operations to be executed in the operation queue, the execution of the output voltage update operations in the operation queue is suspended one by one.

[0051] See also Figure 5 As an example, the trigger indication signal EN is set to be a pulse signal indicating the start time of the picture refresh interval T21 / T31 / T33 in each display frame T1 / T2 / T3 (in an example, as Figure 5 The trigger indication signal EN shown is generated by the timing control circuit 11 based on the frame synchronization signal, and the light emitting power supply circuit 12 is configured to be a predetermined time length (eg Figure 5 The output voltage update operation is performed within the predetermined time Tk shown in FIG. Thus, the light-emitting power supply circuit 12 can determine the image refresh interval of the current display frame (i.e., the predetermined time after the arrival of the electric pulse) through the electric pulse received at the trigger signal input terminal S2 within each display frame.

[0052] The above steps 402 to 404 constitute a working cycle of the light emitting power supply circuit 12 within a display frame. Figure 5During the first display frame T1, the electrical pulse of the trigger indication signal EN indicates the start of the second intermission period T21. At this point, the light-emitting power supply circuit 12 determines in step 402 that there are pending output voltage update operations in the operation queue (i.e., the m=5 output voltage update operations added to the operation queue). In step 403, the light-emitting power supply circuit 12 sequentially executes output voltage update operations to increase the output voltage ELVSS by the step voltage value Un within a predetermined duration Tk. However, due to the limited duration of the predetermined duration Tk, the light-emitting power supply circuit 12 only executes three of the five output voltage update operations upon reaching the predetermined duration Tk, and then stops executing the output voltage update operations in the operation queue in step 404. Similarly, during the second display frame T2, the electrical pulse of the trigger indication signal EN indicates the start of the third intermission period T31. At this point, the light-emitting power supply circuit 12 determines in step 402 that there are pending output voltage update operations (two remaining) in the operation queue. In step 403, the light-emitting power supply circuit 12 sequentially executes the remaining two output voltage update operations within the predetermined duration Tk. Thereafter, since there are no pending output voltage update operations in the operation queue, the output voltage ELVSS remains at the target voltage value Um reached after executing five output voltage update operations from the initial value. In the third display frame T3, the electrical pulse of the trigger indication signal EN indicates the start time of the fourth intermission period T33. At this time, the light-emitting power supply circuit 12 determines in step 402 that there are no pending output voltage update operations in the operation queue, and therefore no longer executes steps 403 and 404 in the current display frame.

[0053] It can be seen that Figure 4 The illustrated process flow implements an update method that causes the output voltage of the light-emitting power supply circuit 12 to change gradually only during the image refresh interval of each display frame, with each step changing only a single voltage value. This update method not only avoids the image refresh interval within each display frame but also avoids drastic changes in the output voltage over a short period of time. This allows the execution of output voltage update instructions to be executed more gently and less noticeably, helping to reduce power consumption and improve display quality in related display products.

[0054] In addition, by utilizing the existing frame synchronization signal of the timing control circuit 11, the waveform of the required trigger indication signal EN can be obtained through simple signal processing, and the light-emitting power supply circuit 12 can achieve synchronization with the display frame only through the combination of electrical pulses and the internally stored preset time length Tk, without relying on other complex circuits or connecting lines. As an example of a configuration method of the preset time length Tk, the preset time length Tk is configured to be no longer than the duration of the screen refresh interval (for example, Figure 5The preset time length Tk in the second rest period T21 is less than the time length of the second rest period T21 and is not less than the time length required for continuously performing q output voltage update operations (q is a positive integer such as 2, 3, 4, or 5).

[0055] It should be noted that, in different embodiments, the parameter configuration related to adding the output voltage update operation in the operation queue can be implemented by the timing control circuit 11 and / or the light-emitting power supply circuit 12 .

[0056] In one example, the output voltage update instruction includes the value of m and the voltage change direction identifier. The timing control circuit 11 is configured to determine the value of m and the voltage change direction identifier based on the target voltage value Um, the absolute value of the step voltage value Un, and the target voltage value corresponding to the previous output voltage update instruction when generating the output voltage update instruction. The absolute value of the step voltage value is a constant value pre-configured in the timing control circuit and the light-emitting power supply circuit. In this example, the above parameter configuration is completely instructed by the timing control circuit 11 through the output voltage update instruction - see Figure 5 When the timing control circuit 11 generates the output voltage update instruction, it obtains the previous target voltage value U0 (i.e. Figure 5 The initial value of the output voltage ELVSS in the output circuit 12 is calculated based on the current target voltage value Um and the pre-configured step voltage value Un, and m=(Um-U0) / Un is calculated. Based on the judgment that Um>U0, a voltage change direction identifier indicating a voltage increase is generated. When an output voltage update instruction is received, the light-emitting power supply circuit 12 directly generates m output voltage update operations that cause the voltage to increase according to the value of m and the voltage change direction identifier, wherein each output voltage update operation is an operation that causes the output voltage ELVSS to increase by the step voltage value Un.

[0057] In another example, the output voltage update instruction includes a target voltage value. When the light emitting power supply circuit 12 receives the output voltage update instruction, it is configured to determine the value of m and the voltage change direction of the output voltage update operation to be added based on the target voltage value, the current output voltage value of the negative voltage output terminal of the light emitting power supply circuit 12, and the absolute value of the step voltage value. The absolute value of the step voltage value is a constant value pre-configured in the light emitting power supply circuit. In this example, the above parameter configuration is almost entirely completed by the light emitting power supply circuit 12 according to the output voltage update instruction - see Figure 5The output voltage update instruction sent by the timing control circuit 11 includes the target voltage value Um, and the light-emitting power supply circuit 12 that receives the output voltage update instruction calculates m=(Um-U0) / Un based on the target voltage value Um, the voltage value U0 of the current output voltage ELVSS and the pre-configured step voltage value Un, and determines that the voltage change direction is rising based on Um>U0, thereby adding m output voltage update operations that increase the voltage, wherein each output voltage update operation is an operation that causes the output voltage ELVSS to increase by the step voltage value Un.

[0058] In another example, the output voltage update instruction includes the target voltage value and the absolute value of the step voltage value. The light emitting power supply circuit is configured to determine the value of m and the step voltage value of the output voltage update operation to be added based on the target voltage value, the absolute value of the step voltage value, and the voltage value of the output voltage of the current negative voltage output terminal of the light emitting power supply circuit when receiving the output voltage update instruction. In this example, the above parameter configuration is completed by the timing control circuit 11 and the light emitting power supply circuit 12 in cooperation - see Figure 5 The output voltage update instruction sent by the timing control circuit 11 includes a target voltage value Um and a step voltage value Un (the values ​​of which are determined by the timing control circuit 11 and may vary between different instructions). Upon receiving the output voltage update instruction, the light-emitting power supply circuit 12 calculates m = (Um - U0) / Un based on the target voltage value Um, the current output voltage ELVSS value U0, and the step voltage value Un. Based on the condition Um > U0, the voltage change direction is determined to be rising, thereby adding m output voltage update operations that increase the voltage. Unlike the previous two examples, the step voltage value Un in this example is configured as a variable parameter.

[0059] Optionally, refer to Figure 4 and 5 In step 403, the output voltage update operations are sequentially performed within a predetermined duration Tk, increasing the output voltage ELVSS by a step voltage value Un. ELVSS rises in a gradually increasing stair-like manner. Similarly, within the second display frame T2, the electrical pulse of the trigger indication signal EN indicates the start of the third intermission period T31. At this time, the light-emitting power supply circuit 12 determines in step 402 that there are pending output voltage update operations (two remaining) in the operation queue. In step 403, the remaining two output voltage update operations are sequentially performed within the predetermined duration Tk. ELVSS rises in a gradually increasing stair-like manner.

[0060] Figure 6 FIG1 is a flow chart of a method for adjusting the light-emitting power supply voltage in a display panel according to an embodiment of the present application. The display panel is any one of the display panels described above. Figure 6, the steps of the method are as follows.

[0061] In step 601, the timing control circuit sends an output voltage update instruction to the light-emitting power supply circuit through the data sending end, and provides a trigger indication signal to the trigger signal output end, which is used to indicate the image refresh interval period within the display frame of the display panel.

[0062] In step 602, the light emitting power supply circuit receives an output voltage update instruction through the data receiving terminal, and performs an output voltage update operation corresponding to the output voltage update instruction within the screen refresh interval according to the trigger indication signal of the trigger signal input terminal.

[0063] It can be seen that in the embodiment of the present application, a trigger indication signal is provided by the timing control circuit to the light-emitting power supply circuit, so that the light-emitting power supply circuit can perform the output voltage update operation within the picture refresh interval period indicated by the trigger indication signal, so that the operation of the light-emitting power supply circuit to update its output voltage occurs in the picture refresh interval period within each display frame. In this way, the light-emitting power supply voltage provided to the light-emitting element will not undergo sudden changes during the picture refresh process, and to a certain extent avoid the influence of the change of the light-emitting power supply voltage on the picture display effect. Therefore, it can help solve the problem of serious display defects caused by the application of the light-emitting power supply voltage adjustment scheme, and help to reduce the display power consumption and improve the display effect of related display products.

[0064] In some possible implementations, the trigger indication signal is a pulse signal indicating the start time of the image refresh interval in the display frame, and the above step 602 includes: the light-emitting power supply circuit performs an output voltage update operation within a predetermined time period after the start time of the image refresh interval.

[0065] In some possible implementations, the voltage output terminal of the light-emitting power supply circuit includes a positive voltage output terminal and a negative voltage output terminal, and the negative voltage output terminal of the light-emitting power supply circuit is connected to the cathodes of the plurality of light-emitting elements. The above-mentioned step 602 includes: in response to the received output voltage update instruction, adding m output voltage update operations to an operation queue; wherein each output voltage update operation is an operation of changing the voltage value of the output voltage of the negative voltage output terminal by a step voltage value, the value of m is the quotient of the target voltage change and the step voltage value, and the target voltage change is the difference between the target voltage value and the voltage value of the current output voltage of the negative voltage output terminal of the light-emitting power supply circuit; when an electrical pulse indicating the start time of the current display frame in the trigger indication signal arrives, determining whether there are pending output voltage update operations in the operation queue; if there are pending output voltage update operations in the operation queue, executing the output voltage update operations in the operation queue one by one within a predetermined time period after the start time; and when the predetermined time period after the start time reaches, if there are still pending output voltage update operations in the operation queue, suspending the execution of the output voltage update operations in the operation queue one by one.

[0066] In some possible implementations, the output voltage update instruction includes the value of m and the voltage change direction identifier, and the above-mentioned step 601 includes: when generating the output voltage update instruction, the timing control circuit determines the value of m and the voltage change direction identifier based on the target voltage value, the absolute value of the step voltage value, and the target voltage value corresponding to the previous output voltage update instruction, and the absolute value of the step voltage value is a constant value pre-configured in the timing control circuit and the light-emitting power supply circuit.

[0067] In some possible implementations, the output voltage update instruction includes a target voltage value, and the above-mentioned step 602 includes: when the light-emitting power supply circuit receives the output voltage update instruction, it determines the value of m and the voltage change direction of the output voltage update operation to be added based on the target voltage value, the voltage value of the output voltage of the current negative voltage output terminal of the light-emitting power supply circuit, and the absolute value of the step voltage value, and the absolute value of the step voltage value is a constant value pre-configured in the light-emitting power supply circuit.

[0068] In some possible implementations, the output voltage update instruction includes the absolute values ​​of the target voltage value and the step voltage value. The above-mentioned step 602 includes: when the light-emitting power supply circuit receives the output voltage update instruction, it determines the value of m and the step voltage value of the output voltage update operation to be added based on the target voltage value, the absolute value of the step voltage value, and the voltage value of the output voltage of the current negative voltage output terminal of the light-emitting power supply circuit.

[0069] In some possible implementations, the trigger indication signal is a pulse signal indicating the start time of the picture refresh interval period in the display frame, and the timing control circuit is configured to generate the trigger indication signal based on the frame synchronization signal.

[0070] In some possible implementations, the display panel further includes a gamma circuit located outside the display area, the timing control circuit is connected to the gamma circuit, and the above method further includes: controlling the gamma reference voltage update operation performed by the gamma circuit to be synchronized with the output voltage update operation performed by the light-emitting power supply circuit.

[0071] Figure 7 : is a schematic diagram of the structure of a display device in one embodiment of the present application. The display device includes a display panel composed of any of the above-mentioned types. The display device in the embodiment of the present disclosure can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc. In some possible examples, the above-mentioned multiple light-emitting elements L0 are distributed in the sub-pixel areas Px arranged in several rows and columns of the display device, while the above-mentioned timing control circuit 11, light-emitting power supply circuit 12 and other structures are hidden under the frame of the display device and / or on the back of the display device.

[0072] It can be seen that in the embodiment of the present application, a trigger indication signal is provided by the timing control circuit to the light-emitting power supply circuit, so that the light-emitting power supply circuit can perform the output voltage update operation within the picture refresh interval period indicated by the trigger indication signal, so that the operation of the light-emitting power supply circuit to update its output voltage occurs in the picture refresh interval period within each display frame. In this way, the light-emitting power supply voltage provided to the light-emitting element will not undergo sudden changes during the picture refresh process, and to a certain extent avoid the influence of the change of the light-emitting power supply voltage on the picture display effect. Therefore, it can help solve the problem of serious display defects caused by the application of the light-emitting power supply voltage adjustment scheme, and help to reduce the display power consumption and improve the display effect of related display products.

[0073] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0074] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0075] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0076] Those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be accomplished through hardware, or through a program to instruct the relevant hardware, and the program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0077] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: The display panel includes: a plurality of light-emitting elements located in a display area, and a timing control circuit and a light-emitting power supply circuit located outside the display area; wherein, The voltage output terminal of the light-emitting power supply circuit is connected to the plurality of light-emitting elements, the data transmitting terminal of the timing control circuit is connected to the data receiving terminal of the light-emitting power supply circuit, and the trigger signal output terminal of the timing control circuit is connected to the trigger signal input terminal of the light-emitting power supply circuit; The timing control circuit is configured to send an output voltage update instruction to the light-emitting power supply circuit through the data sending end, and provide a trigger indication signal to the trigger signal output end, wherein the trigger indication signal is used to indicate an image refresh interval period within a display frame of the display panel; The light-emitting power supply circuit is configured to receive the output voltage update instruction through the data receiving end, and perform an output voltage update operation corresponding to the output voltage update instruction within the screen refresh interval according to the trigger indication signal of the trigger signal input end.

2. The display panel according to claim 1, wherein: The trigger indication signal is a pulse signal indicating the start time of the picture refresh interval period in the display frame, and the light emitting power supply circuit is configured to perform the output voltage update operation within a predetermined time period after the start time of the picture refresh interval period.

3. The display panel according to claim 2, wherein: The voltage output terminal of the light-emitting power supply circuit includes a positive voltage output terminal and a negative voltage output terminal, and the negative voltage output terminal of the light-emitting power supply circuit is connected to the cathodes of the plurality of light-emitting elements; the light-emitting power supply circuit is configured as follows: In response to the received output voltage update instruction, m output voltage update operations are added to the operation queue; wherein each output voltage update operation is an operation of changing the voltage value of the output voltage of the negative voltage output terminal by a step voltage value, m is a positive integer, and the value of m is the quotient of the target voltage change and the step voltage value, and the target voltage change is the difference between the target voltage value and the current voltage value of the output voltage of the negative voltage output terminal of the light-emitting power supply circuit; When an electric pulse indicating the start time of the current display frame in the trigger indication signal arrives, determining whether there is the output voltage update operation to be executed in the operation queue; When there are the output voltage update operations to be executed in the operation queue, executing the output voltage update operations in the operation queue one by one within the predetermined time period after the start time; When a predetermined time period has elapsed after the start time, if there are still output voltage update operations to be executed in the operation queue, the execution of the output voltage update operations in the operation queue is suspended one by one.

4. The display panel according to claim 3, wherein: The output voltage update instruction includes the value of m and a voltage change direction identifier, and the timing control circuit is configured to determine the value of m and the voltage change direction identifier based on the target voltage value, the absolute value of the step voltage value, and the target voltage value corresponding to the previous output voltage update instruction when generating the output voltage update instruction, wherein the absolute value of the step voltage value is a constant value pre-configured in the timing control circuit and the light-emitting power supply circuit; or, The output voltage update instruction includes the target voltage value, and the light emitting power supply circuit is configured to, upon receiving the output voltage update instruction, determine the value of m and the voltage change direction of the output voltage update operation to be added based on the target voltage value, the current output voltage value of the negative voltage output terminal of the light emitting power supply circuit, and the absolute value of the step voltage value, wherein the absolute value of the step voltage value is a constant value pre-configured in the light emitting power supply circuit; or, The output voltage update instruction includes the target voltage value and the absolute value of the step voltage value. The light-emitting power supply circuit is configured to determine the value of m and the step voltage value of the output voltage update operation to be added based on the target voltage value, the absolute value of the step voltage value, and the voltage value of the output voltage of the current negative voltage output terminal of the light-emitting power supply circuit when receiving the output voltage update instruction.

5. The display panel according to claim 1, wherein: The trigger indication signal is a pulse signal indicating a start time of the screen refresh interval within the display frame, and the timing control circuit is configured to generate the trigger indication signal based on a frame synchronization signal.

6. The display panel according to any one of claims 1 to 5, characterized in that: The display panel further includes a gamma circuit located outside the display area. The timing control circuit is connected to the gamma circuit and is configured to control the gamma reference voltage update operation performed by the gamma circuit to be synchronized with the output voltage update operation performed by the light emitting power supply circuit.

7. The display panel according to any one of claims 1 to 5, characterized in that: The data sending end of the timing control circuit is connected to the data receiving end of the light-emitting power supply circuit through an integrated circuit data bus.

8. The display panel according to any one of claims 1 to 5, characterized in that: The display panel also includes a power management circuit and at least one other power-consuming component. The power management circuit is respectively connected to the timing control circuit and each of the other power-consuming components. The power management circuit is configured to supply power to the timing control circuit and the at least one other power-consuming component.

9. A method for adjusting the light-emitting power supply voltage in a display panel, characterized in that: The display panel includes: a plurality of light-emitting elements located in a display area, and a timing control circuit and a light-emitting power supply circuit located outside the display area; a voltage output terminal of the light-emitting power supply circuit is connected to the plurality of light-emitting elements, a data transmitting terminal of the timing control circuit is connected to a data receiving terminal of the light-emitting power supply circuit, and a trigger signal output terminal of the timing control circuit is connected to a trigger signal input terminal of the light-emitting power supply circuit; the method includes: The timing control circuit sends an output voltage update instruction to the light-emitting power supply circuit through the data sending end, and provides a trigger indication signal to the trigger signal output end, wherein the trigger indication signal is used to indicate an image refresh interval period within a display frame of the display panel; The light-emitting power supply circuit receives the output voltage update instruction through the data receiving end, and performs an output voltage update operation corresponding to the output voltage update instruction within the screen refresh interval according to the trigger indication signal of the trigger signal input end.

10. A display device, characterized in that: The display device includes the display panel according to any one of claims 1 to 9.

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