Driving circuit and driving method of display panel, and display panel

Abstract

The invention relates to a driving circuit and a driving method of a display panel and the display panel, the driving circuit comprises a time schedule controller, a memory and a level translator, the time schedule controller is provided with a first communication port, a second communication port and a third communication port, the second communication port is connected with the memory, the third communication port is connected with the level translator, and the level translator is connected with the memory. Wherein the time schedule controller is used for acquiring a refresh rate adjustment instruction, acquiring an overcurrent protection parameter corresponding to the refresh rate adjustment instruction, and sending the overcurrent protection parameter to the level translator; the memory is used for storing at least two over-current protection parameters; and the level converter is used for setting an overcurrent protection function of the display panel according to the overcurrent protection parameter, so that the width of a detection window of the overcurrent protection function is adaptive to the pulse width of the vertical clock signal under the target refresh rate. Through the circuit, the technical problem that the design of a fixed overcurrent protection parameter is difficult to adapt to a display panel with a variable refresh rate is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a driving circuit and method of display panel, and display panel. BACKGROUND

[0002] With the rapid development of display technology, LCD panel manufacturers generally adopt dynamic adjustment of vertical resolution or compression of row / field scanning period (H total / V total) and other schemes to realize the refresh rate improvement. Although such schemes can expand the refresh rate from the conventional 60Hz to 120Hz, 144Hz or even higher, they cause the vertical clock signal (CKV) pulse width to be significantly shortened as the refresh rate increases. For example, the CKV pulse width is 16.65μs in the 60Hz mode, and it is reduced to 7.11μs in the 144Hz mode. Such changes pose a serious challenge to the reliability of the overcurrent protection function (OCP).

[0003] In the prior art, the setting of the OCP parameter is usually designed based on the CKV pulse width in the initial display mode (such as 60Hz), and the detection window width based on the OCP parameter setting needs to be less than the CKV pulse width to trigger effective protection. However, when the refresh rate of the display panel changes, the CKV pulse width changes, but the detection window width based on the fixed OCP parameter setting does not change, which leads to the fact that in some cases, the overcurrent protection function fails due to the mismatch between the detection window width and the CKV pulse width.

[0004] It can be seen that the current fixed OCP parameter design is difficult to adapt to the display panel with variable refresh rate, and when the refresh rate of the display panel changes, the overcurrent protection function is prone to failure. SUMMARY

[0005] The present application provides a driving circuit and method of display panel, and display panel to solve the technical problem that the fixed OCP parameter design is difficult to adapt to the display panel with variable refresh rate.

[0006] In a first aspect, the present application provides a driving circuit of display panel, the driving circuit comprising a timing controller, a memory and a level converter, the timing controller being provided with a first communication port, a second communication port and a third communication port, the second communication port being connected to the memory, and the third communication port being connected to the level converter, wherein:

[0007] The timing controller is configured to obtain an overcurrent protection parameter corresponding to a refresh rate adjustment instruction from the second communication port according to the refresh rate adjustment instruction obtained through the first communication port, and send the overcurrent protection parameter through the third communication port;

[0008] The memory is configured to store at least two over-current protection parameters, each of which corresponds to a different refresh rate.

[0009] The level converter is configured to set an over-current protection function of a display panel according to the over-current protection parameters, so that a detection window width of the over-current protection function is adapted to a pulse width of a vertical clock signal at the target refresh rate.

[0010] In an embodiment, the first communication port and the third communication port are two-wire serial bus ports, the second communication port is a serial peripheral interface port, the first communication port is connected to an external input port as a master two-wire serial bus port, and the third communication port is connected to the level converter as a slave two-wire serial bus port. The external input port is configured to input the refresh rate adjustment instruction.

[0011] In an embodiment, the timing controller includes a signal type conversion module connected to the first communication port, the second communication port, and the third communication port. The signal type conversion module is configured to convert between two-wire serial bus type signals and serial peripheral interface type signals.

[0012] In an embodiment, the over-current protection parameters include at least a blanking time and a detection time. Each of the over-current protection parameters in the memory is set to a sum of the blanking time and the detection time being less than or equal to a pulse width of a vertical clock signal at the target refresh rate corresponding to the over-current protection parameter.

[0013] In an embodiment, the timing controller further includes a black insertion module connected to the first communication port. The black insertion module is configured to configure a display panel to display a pure black picture in response to the refresh rate adjustment instruction. The duration of the pure black picture is greater than or equal to a setting time of the over-current protection function.

[0014] In a second aspect, the application provides a display panel driving method. The method is applied to a timing controller connected to a memory and a level converter. The method includes:

[0015] Receiving a refresh rate adjustment instruction. The refresh rate adjustment instruction is configured to instruct a display panel to adjust a refresh rate to a target refresh rate.

[0016] acquire a over-current protection parameter corresponding to the refresh rate adjustment instruction from the memory; wherein, the memory stores at least two over-current protection parameters, each of the over-current protection parameters corresponds to a different refresh rate;

[0017] send the over-current protection parameter to the level shifter, so that the level shifter sets the over-current protection function of the display panel according to the over-current protection parameter, so that the detection window width of the over-current protection function is adapted to the pulse width of the vertical clock signal under the target refresh rate.

[0018] In an embodiment of the present application, the over-current protection parameter at least includes a blanking time and a detection time, and each of the over-current protection parameters is set to be less than or equal to the sum of the blanking time and the detection time, and the pulse width of the vertical clock signal under the target refresh rate corresponding to the over-current protection parameter.

[0019] In an embodiment of the present application, before receiving the refresh rate adjustment instruction, the method further comprises:

[0020] receiving an externally programmed initialization instruction; wherein, the initialization instruction includes first initialization data, the first initialization data includes a plurality of over-current protection parameters and the refresh rate corresponding to each of the over-current protection parameters, and the first initialization data is a two-wire serial bus type signal;

[0021] convert the first initialization data into second initialization data; wherein, the second initialization data is a serial peripheral interface type signal;

[0022] write the second initialization data into the memory.

[0023] In an embodiment of the present application, after receiving the refresh rate adjustment instruction, the method further comprises:

[0024] in response to the refresh rate adjustment instruction, configure the display panel to display a pure black screen; wherein, the duration of the pure black screen is greater than or equal to the setting time of the over-current protection function.

[0025] In a third aspect, the present application provides a display panel, comprising a display area and a non-display area, the non-display area is arranged around the display area, and the display panel comprises the driving circuit according to any one of the first aspect.

[0026] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0027] The driving circuit provided in the embodiments of the present application comprises a timing controller, a first communication port, a second communication port and a third communication port. The timing controller receives a refresh rate adjustment instruction through the first communication port, acquires an over-current protection parameter corresponding to the refresh rate adjustment instruction from the memory through the second communication port, and sends the over-current protection parameter to the level converter through the third communication port, so that the level converter sets the over-current protection function of the display panel according to the over-current protection parameter, and makes the detection window width of the over-current protection function adapt to the pulse width of the vertical clock signal under the target refresh rate.

[0028] It can be seen that, by using the driving circuit provided in the embodiments of the present application, when the refresh rate of the display panel is adjusted, different over-current protection parameters are matched based on the target refresh rate, and no matter how the refresh rate of the display panel changes, the detection window of the over-current protection function can be set according to the corresponding over-current protection parameter, so that the over-current protection function can be triggered effectively, and the technical problem that the design of the fixed over-current protection parameter is difficult to adapt to the display panel with variable refresh rate is solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, brief descriptions will be given below to the drawings needed to be used in the embodiments or the prior art descriptions. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0031] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding thereto, and these exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.

[0032] Figure 1 A structural schematic diagram of a driving circuit of a display panel provided in the embodiments of the present application;

[0033] Figure 2 A specific setting mode schematic diagram of a driving circuit of a display panel provided in the embodiments of the present application on the display panel;

[0034] Figure 3 A working timing diagram of a driving circuit of a display panel provided in the embodiments of the present application;

[0035] Figure 4 A flowchart of a driving method of a display panel provided in the embodiments of the present application;

[0036] Figure 5 A structural schematic diagram of a display panel provided by an embodiment of the present application is shown in FIG. 1.

[0037] Explanation of reference signs:

[0038] 1, a driving circuit of the display panel; 2, a timing controller; 3, a memory; 4, a level converter; 21, a first communication port; 22, a second communication port; 23, a third communication port; 24, a fourth communication port; 5, an external input port. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity and clarity, the description of the specific examples in the following text will be described. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or settings discussed.

[0041] In order to solve the technical problem that the design of fixing the OCP parameter in the prior art is difficult to adapt to the display panel with variable refresh rate, the present application provides a driving circuit and a driving method of a display panel, and a display panel, which can match different over-current protection parameters based on a target refresh rate, and can always set a detection window of the over-current protection function according to the corresponding over-current protection parameter, so as to ensure that the over-current protection function can be triggered effectively.

[0042] Figure 1 A structural schematic diagram of a driving circuit 1 of a display panel provided by an embodiment of the present application is shown in FIG. 1. Figure 1 The driving circuit 1 of the display panel provided by the embodiment of the present application comprises a timing controller 2, a memory 3 and a level converter 4. The timing controller 2 is provided with a first communication port 21, a second communication port 22 and a third communication port 23. The second communication port 22 is connected to the memory 3, and the third communication port 23 is connected to the level converter 4. In the driving circuit 1 of the display panel provided by the embodiment of the present application, the first communication port 21 is connected to the second communication port 22, and the second communication port 22 is connected to the third communication port 23.

[0043] The timing controller 2 is configured to acquire the over-current protection parameter corresponding to the refresh rate adjustment instruction from the second communication port 22 according to the refresh rate adjustment instruction acquired through the first communication port 21, and send the over-current protection parameter through the third communication port 23.

[0044] The memory 3 is configured to store at least two over-current protection parameters, and each over-current protection parameter corresponds to a different refresh rate.

[0045] The level converter 4 is configured to set the over-current protection function of the display panel according to the over-current protection parameter, so that the detection window width of the over-current protection function is adapted to the pulse width of the vertical clock signal under the target refresh rate.

[0046] Specifically, the driving circuit 1 of the display panel provided in the embodiment of the present application is specifically arranged on a control board (CB, Control Board) of the display panel, the refresh rate of the display panel is variable, and the driving circuit comprises a timing controller 2, a memory 3 and a level converter 4.

[0047] The timing controller 2 is provided with a plurality of communication ports, at least comprising a first communication port 21, a second communication port 22 and a third communication port 23, the first communication port 21 is connected with an external input port 5 arranged on the control board, the second communication port 22 is connected with the memory 3, and the third communication port 23 is connected with the level converter 4.

[0048] The timing controller 2 receives the refresh rate adjustment instruction input by the external input port 5 through the first communication port 21, and the refresh rate adjustment instruction is used to instruct the display panel to adjust the refresh rate to a target refresh rate, therefore, the refresh rate adjustment instruction actually contains information indicating the target refresh rate.

[0049] In some specific examples, the refresh rate adjustment instruction can be triggered to be generated by the action of the user actively adjusting the refresh rate of the display panel, for example, the user touches the refresh rate adjustment button arranged on the display panel, and the refresh rate adjustment button is triggered to generate the refresh rate adjustment instruction. In another specific example, the refresh rate adjustment instruction can also be generated by the display panel according to the current display requirement, for example, the display panel detects the current display picture, and actively adjusts the refresh rate based on the actual situation of the picture, and adjusts the refresh rate to be high for the picture with high refresh rate requirement, and adjusts the refresh rate to be low for the picture with low refresh rate requirement.

[0050] The timing controller 2 acquires the over-current protection parameter corresponding to the refresh rate adjustment instruction from the memory 3 through the second communication port 22, the refresh rate adjustment instruction indicates the target refresh rate, and when the timing controller 2 determines the target refresh rate of the current display panel, the over-current protection parameter corresponding to the target refresh rate is read from the memory 3 through the second communication port 22.

[0051] The timing controller 2 sends the over-current protection parameter to the level shifter 4 through the third communication port 23.

[0052] The memory 3 stores at least two over-current protection parameters, different over-current protection parameters correspond to different refresh rates, when the memory 3 receives the read instruction of the timing controller 2 reading the over-current protection parameter, the corresponding over-current protection parameter is found based on the read instruction, and the over-current protection parameter is returned to the timing controller 2. As an example, the memory can be a flash memory.

[0053] In some specific examples, the over-current protection parameter is stored in the memory 3 in the form of a character, the refresh rate corresponding to the over-current protection parameter is stored in the memory 3 in the form of an address, and one character is associated with one address. It can be seen that when the memory 3 receives the read instruction of the timing controller 2 reading the over-current protection parameter, the address is determined based on the target refresh rate indicated by the read instruction, and the associated character is found at the address, so as to determine the over-current protection parameter corresponding to the target refresh rate.

[0054] In some specific examples, the over-current protection parameter is determined by a technician in advance, and the variable refresh rate of the display panel has been specified when the display panel is manufactured. The technician obtains the over-current protection parameter corresponding to each refresh rate by actual measurement, and writes these over-current protection parameters into the memory 3 through the initialization process of the display panel.

[0055] In some specific examples, the memory 3 specifically stores an over-current protection parameter corresponding to an initial refresh rate and a plurality of over-current protection parameters corresponding to non-initial refresh rates. The initial refresh rate refers to the refresh rate of the display panel determined by the properties of the display panel itself, and the non-initial refresh rate refers to the refresh rate obtained by adjusting the vertical resolution or compressing the row / field scanning period of the display panel. For example, for a display panel with adjustable refresh rate, the refresh rate in the initial UHD (Ultra High Definition) mode is 60HZ, and the refresh rate in the DLG (Dual Line Generation) mode or HSR (High Speed Refresh) mode is 120HZ. The initial refresh rate of the display panel is 60HZ, and the non-initial refresh rate is 120HZ.

[0056] The level shifter 4 is used to set the over-current protection function of the display panel according to the over-current protection parameter, and in some specific examples, the level shifter 4 is connected with the gate drive circuit of the display panel through the external output interface of the control board, and the over-current protection is realized based on the over-current protection parameter for detecting the vertical clock signal in the gate drive circuit.

[0057] When the level converter 4 receives the over-current protection parameter corresponding to the target refresh rate from the timing controller 2, a detection window is set based on the over-current protection parameter, the detection window matches the pulse width of the vertical clock signal, and whether the vertical clock signal is over-current is detected through the detection window.

[0058] It can be seen that, by the driving circuit provided in the embodiments of the present application, when the refresh rate of the display panel is adjusted, different over-current protection parameters are matched based on the target refresh rate, no matter how the refresh rate of the display panel changes, the detection window of the over-current protection function can be set according to the corresponding over-current protection parameter, and it is ensured that the over-current protection function can be triggered effectively, thereby solving the technical problem that the design of the fixed over-current protection parameter is difficult to adapt to the display panel with variable refresh rate.

[0059] In a feasible embodiment of the present application, the first communication port 21 and the third communication port 23 are two-wire serial bus (Inter-Integrated Circuit, I2C) ports, the second communication port 22 is a serial peripheral interface (Serial Peripheral Interface, SPI) port, the first communication port 21 is connected with the external input port 5 as a master two-wire serial bus port, and the third communication port 23 is connected with the level converter 4 as a slave two-wire serial bus port.

[0060] In a feasible embodiment of the present application, the timing controller 2 includes a signal type conversion module, the signal type conversion module is connected with the first communication port 21, the second communication port 22 and the third communication port 23 respectively, and the signal type conversion module is used to realize mutual conversion between the two-wire serial bus type signal and the serial peripheral interface type signal.

[0061] Specifically, the signal type conversion module is integrated in the timing controller 2, and the signal type conversion module is embedded between the two-wire serial bus and the serial peripheral interface communication path, and realizes bidirectional conversion between the two-wire serial bus type signal and the serial peripheral interface type signal. Specifically, the initialization data burned by the external input port 5 is converted into the serial peripheral interface type signal by the signal type conversion module and then stored in the memory 3, and when the timing controller 2 needs to read the over-current protection parameter in the memory 3, the serial peripheral interface type signal is converted into the two-wire serial bus type signal again by the signal type conversion module.

[0062] In the prior art, the external input port 5 of the control board is directly connected to the level converter 4 to realize the input of fixed overcurrent protection parameters. Through the above embodiments of the present application, different communication protocols are set for different communication ports to ensure that overcurrent protection parameter entry, overcurrent protection parameter reading, overcurrent protection parameter output and refresh rate adjustment instruction receiving do not interfere with each other, and at the same time, an implementation basis is provided for dynamic adjustment of overcurrent protection parameters.

[0063] In a feasible embodiment of the present application, the overcurrent protection parameters at least include a blanking time and a detection time, and each overcurrent protection parameter in the memory 3 is set to be less than or equal to the sum of the blanking time and the detection time.

[0064] Specifically, the overcurrent protection parameters at least include a blanking time and a detection time, and in some actual examples, the overcurrent protection parameters can also include a current threshold, a response time, a protection mode and the like.

[0065] The blanking time and the detection time are used to set a detection window of the overcurrent protection function of the display panel, and specifically, the sum of the blanking time and the detection time is equal to the width of the detection window.

[0066] The memory 3 stores a plurality of parameter combinations of the blanking time and the detection time, each combination corresponds to a refresh rate, and under each combination, the sum of the blanking time and the detection time is strictly limited to be less than or equal to the pulse width of the vertical clock signal under the corresponding refresh rate.

[0067] Taking a refresh rate of 144Hz as an example, the pulse width of the vertical clock signal under 144Hz is calculated to be 7.11μs, at this time, the overcurrent protection parameters pre-stored in the memory 3 can be set to a blanking time T_blank=5.5μs and a detection time T_detect=1.5μs, and the sum of the two is 7.0μs, which is less than the pulse width of the vertical clock signal and accurately fits the pulse width of 7.11μs, ensuring that the detection window completely falls within the effective level interval of the vertical clock signal.

[0068] Through strict limitation of the overcurrent protection parameters, the adaptability of the overcurrent protection parameters to the target refresh rate is ensured, and for any target refresh rate, a suitable overcurrent protection parameter can be used to set a detection window for the overcurrent protection function.

[0069] In an embodiment of the present application, the timing controller 2 further comprises a black insertion module connected to the first communication port 21, the black insertion module being configured to display a pure black picture on the display panel in response to the refresh rate adjustment instruction; wherein the duration of the pure black picture is greater than or equal to the setting time of the over-current protection function.

[0070] Specifically, based on the above embodiment, when the refresh rate of the display panel changes, the corresponding over-current protection parameter also changes adaptively. During the change of the over-current protection parameter, the timing controller 2 needs to be reconfigured. During the configuration, due to the superposition of new and old timing signals, unstable Gamma (gray scale) voltage, and other reasons, the display panel may have problems such as picture tearing and brightness flickering.

[0071] Therefore, when the timing controller 2 receives the refresh rate adjustment instruction, it controls the display panel to perform black insertion, so that the display panel displays a pure black picture. After the timing controller 2 completes the configuration of the level shifter 4, it controls the display panel to display normally.

[0072] In some actual examples, the level shifter 4 can return configuration success information to the timing controller 2 after completing the configuration, and the timing controller 2 receives the configuration success information through the third communication port 23, ends the black insertion, and controls the display panel to display normally. In this example, the display panel displays a pure black picture after the timing controller 2 receives the refresh rate adjustment instruction, and starts to display a normal picture again after the timing controller 2 receives the configuration success information.

[0073] Through the technical solution provided by the above embodiment, black insertion is performed when the timing controller 2 configures the level shifter 4, which ensures that the error picture will not be displayed on the display panel, avoids problems such as picture tearing and brightness flickering of the display panel, and effectively improves the user's experience.

[0074] Figure 2 The specific setting method of the display panel driving circuit 1 provided by the embodiment of the present application on the display panel is shown in the schematic diagram. In some actual examples, the specific setting method of the display panel driving circuit 1 provided by the embodiment of the present application on the display panel is as shown in Figure 5 .

[0075] Referring to Figure 5 , the display panel driving circuit 1 provided by the embodiment of the present application is arranged on the control panel, and the driving circuit comprises a timing controller 2, a memory 3, and a level shifter 4. The timing controller 2 is provided with a first communication port 21, a second communication port 22, a third communication port 23, and a fourth communication port 24.

[0076] The first communication port 21 of the timing controller 2 is connected with the external input port 5, and receives the refresh rate adjustment instruction and the initialization data from the external input port 5; the second communication port 22 is connected with the memory 3, and reads the over-current protection parameter corresponding to the refresh rate adjustment instruction from the memory 3; the third communication port 23 is connected with the level converter 4, and transmits the over-current protection parameter to the level converter 4; and the fourth communication port 24 is also connected with the level converter 4, and transmits other parameters related to display (such as the vertical clock signal CKV_T, the vertical scanning start signal STV_T or the LC_T row clock signal) to the level converter 4.

[0077] The level converter 4 is connected with the external output port, and is connected with the circuit board XB of the display panel through the external output port, and is connected with the liquid crystal glass OC through the chip on film (COF), and drives the display panel to display.

[0078] Figure 3 A working timing diagram of the driving circuit 1 of the display panel provided by the embodiment is shown in FIG. 6. Figure 2 With Figure 3 In combination with the description of the above embodiments, the working process of the driving circuit 1 of the display panel provided by the embodiment is described, which specifically includes the following steps.

[0079] Firstly, the timing controller 2 receives the initialization data through the first communication port 21, burns the initialization data containing the timing, the over-current protection parameter and the like, converts the initialization data into the serial peripheral interface signal recognizable by the memory 3 through the signal type conversion module in the timing controller 2, and finally stores the initialization data into the memory 3.

[0080] Then, the following steps S301-S308 are executed.

[0081] S301: The timing controller 2 downloads the initialization data through the second communication port 22, and performs initialization;

[0082] S302: The timing controller 2 reads the over-current protection parameter corresponding to the first refresh rate (i.e. the initial refresh rate of the display panel) through the second communication port 22;

[0083] S303: The timing controller 2 sends the over-current protection parameter corresponding to the first refresh rate to the level converter 4 through the third communication port 23;

[0084] S304: The level converter 4 configures the over-current protection function based on the over-current protection parameter corresponding to the first refresh rate;

[0085] S305: The refresh rate of the display panel is adjusted from the first refresh rate to the second refresh rate, and the timing controller 2 receives the refresh rate adjustment instruction through the first communication port 21;

[0086] S306: The timing controller 2 reads the over-current protection parameter corresponding to the second refresh rate through the second communication port 22.

[0087] S307: The timing controller 2 sends the over-current protection parameter corresponding to the second refresh rate to the level shifter 4 through the third communication port 23.

[0088] S308: The level shifter 4 configures the over-current protection function based on the over-current protection parameter corresponding to the second refresh rate.

[0089] Meanwhile, after step S305 is performed, step S309 is performed at the same time as steps S306-S307 are performed.

[0090] S309: The timing controller 2 configures the display panel to display a pure black screen.

[0091] Figure 4 A method flowchart of a display panel driving method provided by an embodiment of the present application, the display panel driving method provided by an embodiment of the present application is applied to a timing controller 2, the timing controller 2 is connected with a memory 3 and a level shifter 4 respectively, and the display panel driving method is described in detail with reference to Figure 4 The method specifically includes the following steps:

[0092] S401: Receiving a refresh rate adjustment instruction; wherein the refresh rate adjustment instruction is used to instruct the display panel to adjust the refresh rate to a target refresh rate;

[0093] S402: Obtaining an over-current protection parameter corresponding to the refresh rate adjustment instruction from the memory 3; wherein the memory 3 stores at least two over-current protection parameters, and each over-current protection parameter corresponds to a different refresh rate;

[0094] S403: Sending the over-current protection parameter to the level shifter 4, so that the level shifter 4 sets the over-current protection function of the display panel according to the over-current protection parameter, so that the detection window width of the over-current protection function is adapted to the pulse width of the vertical clock signal under the target refresh rate.

[0095] In a feasible embodiment of the present application, the over-current protection parameter at least includes a blanking time and a detection time, and each over-current protection parameter is set to be less than or equal to the sum of the blanking time and the detection time. The pulse width of the vertical clock signal under the target refresh rate corresponding to the over-current protection parameter.

[0096] In a feasible embodiment of the present application, before receiving the refresh rate adjustment instruction, the method further includes:

[0097] receive an external-burned initialization instruction; wherein the initialization instruction comprises first initialization data, the first initialization data comprises a plurality of over-current protection parameters and a refresh rate corresponding to each over-current protection parameter, and the first initialization data is a two-wire serial bus type signal;

[0098] convert the first initialization data into second initialization data; wherein the second initialization data is a serial peripheral interface type signal;

[0099] write the second initialization data into the memory 3.

[0100] In a feasible embodiment of the present application, after receiving the refresh rate adjustment instruction, the method further comprises:

[0101] in response to the refresh rate adjustment instruction, configure the display panel to display a pure black picture; wherein the duration of the pure black picture is greater than or equal to the setting time of the over-current protection function.

[0102] Figure 5 A structural diagram of a display panel is provided in an embodiment of the present application. The display panel comprises a display area and a non-display area, the non-display area is arranged around the display area, and the display panel comprises a display panel driving circuit 1 as described in any one of the circuit embodiments above, and the display panel driving circuit 1 is arranged in the non-display area of the display panel.

[0103] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0104] The above description is merely one specific example embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A driving circuit for a display panel, characterized in that: The driving circuit includes a timing controller, a memory, and a level converter, wherein the memory and the timing controller are provided with a first communication port, a second communication port, and a third communication port, the second communication port is connected to the memory, and the third communication port is connected to the level converter, wherein: The timing controller is configured to obtain an overcurrent protection parameter corresponding to the refresh rate adjustment instruction from the second communication port according to the refresh rate adjustment instruction obtained through the first communication port, and send the overcurrent protection parameter through the third communication port; The memory is used to store at least two of the overcurrent protection parameters, each of which corresponds to a different refresh rate; The level converter is used to set the overcurrent protection function of the display panel according to the overcurrent protection parameter, so that the detection window width of the overcurrent protection function is adapted to the pulse width of the vertical clock signal at the target refresh rate.

2. The circuit according to claim 1, wherein: The first communication port and the third communication port are two-wire serial bus ports, the second communication port is a serial peripheral interface port, the first communication port is connected to the external input port as a master two-wire serial bus port, and the third communication port is connected to the level converter as a slave two-wire serial bus port; wherein, the external input port is used to input the refresh rate adjustment instruction.

3. The circuit according to claim 2, characterized in that The timing controller includes a signal type conversion module, which is connected to the first communication port, the second communication port and the third communication port respectively. The signal type conversion module is used to realize the mutual conversion between two-wire serial bus type signals and serial peripheral interface type signals.

4. The circuit according to claim 1, wherein: The overcurrent protection parameters include at least blanking time and detection time, and each of the overcurrent protection parameters in the memory is set so that the sum of the blanking time and the detection time is less than or equal to the pulse width of the vertical clock signal at the target refresh rate corresponding to the overcurrent protection parameter.

5. The circuit according to claim 1, wherein: The timing controller also includes a black insertion module, which is connected to the first communication port and is used to configure the display panel to display a pure black picture in response to the refresh rate adjustment instruction; wherein the duration of the pure black picture is greater than or equal to the setting time of the overcurrent protection function.

6. A method for driving a display panel, characterized in that: The method is applied to a timing controller, wherein the timing controller is connected to a memory and a level converter respectively, and the method includes: Receiving a refresh rate adjustment instruction; wherein the refresh rate adjustment instruction is used to instruct the display panel to adjust the refresh rate to a target refresh rate; Obtaining an overcurrent protection parameter corresponding to the refresh rate adjustment instruction from the memory; wherein the memory stores at least two overcurrent protection parameters, each of which corresponds to a different refresh rate; The overcurrent protection parameter is sent to the level converter so that the level converter sets the overcurrent protection function of the display panel according to the overcurrent protection parameter, so that the detection window width of the overcurrent protection function is adapted to the pulse width of the vertical clock signal at the target refresh rate.

7. The method according to claim 6, characterized in that The overcurrent protection parameters include at least blanking time and detection time, and each of the overcurrent protection parameters is set so that the sum of the blanking time and the detection time is less than or equal to the pulse width of the vertical clock signal at the target refresh rate corresponding to the overcurrent protection parameter.

8. The method according to claim 6, characterized in that Before receiving the refresh rate adjustment instruction, the method further includes: Receive an initialization instruction for external burning; wherein the initialization instruction includes first initialization data, the first initialization data includes a plurality of the overcurrent protection parameters and a refresh rate corresponding to each of the overcurrent protection parameters, and the first initialization data is a two-wire serial bus type signal; Converting the first initialization data into second initialization data; wherein the second initialization data is a serial peripheral interface type signal; The second initialization data is written into the memory.

9. The method according to claim 6, characterized in that After receiving the refresh rate adjustment instruction, the method further includes: In response to the refresh rate adjustment instruction, the display panel is configured to display a pure black picture; wherein the duration of the pure black picture is greater than or equal to the setting time of the overcurrent protection function.

10. A display panel comprising a display area and a non-display area, wherein the non-display area is arranged around the display area, characterized in that: The display panel includes the driving circuit according to any one of claims 1 to 5, and the driving circuit is arranged in a non-display area of ​​the display panel.

Images