Backlight control method, backlight control circuit and display device

Abstract

The embodiment of the invention relates to a backlight control method, a backlight control circuit and a display device. The method comprises the steps that a preset mapping table representing the mapping relation between backlight partitions and pixel partitions is acquired; receiving input image data; according to the mapping table, performing driving current calculation on the image data to obtain a driving current value of each backlight partition in the backlight plate; and sending the driving current value to a backlight driving module, so that the backlight driving module outputs the driving current to each backlight subarea in the backlight plate according to the driving current value. According to the embodiment of the invention, the backlight subarea and the constant current driving function of each subarea are separated from the main controller, and the two functions are integrated into one device for execution, so that the number of times of image data conversion is reduced, pins of the main controller are saved, the efficiency of backlight subarea driving is improved, and the cost is reduced. And meanwhile, the method can adapt to a scene with a large number of backlight partitions.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a backlight control method, a backlight control circuit and a display device. Background Art

[0002] With the development of LED (Light-Emitting Diode) backlight technology, it is possible to drive the light in different areas, and its application range is getting wider and wider. For example, Mini-LED technology that drives the light in different areas can be used in the fields of televisions, monitors, and automotive displays as the backlight source of display panels.

[0003] The main architectures of current Mini-LED display technology include backlight controller + SOC (System on Chip) split architecture and SOC integrated architecture. The SOC split architecture needs to convert the original screen data of the SOC into SPI data and send it to the backlight controller, and then the backlight controller controls the backlight driver IC to display through a proprietary protocol. The two conversion processes have a long delay and low data utilization. At the same time, the SOC must support the LD (Local Dimming) function. The SOC integrated architecture needs to integrate the LD function and the backlight display control function, and the SOC pins are limited, so it can only adapt to fewer backlight partitions.

[0004] Therefore, how to drive more backlight partitions and improve the efficiency of backlight partition driving is an urgent problem to be solved. Summary of the invention

[0005] In view of this, in order to solve some or all of the above technical problems, the embodiments of the present application provide a backlight control method, a backlight control circuit and a display device.

[0006] In a first aspect, an embodiment of the present application provides a backlight control method, the method comprising: obtaining a preset mapping table representing a mapping relationship between backlight partitions and pixel partitions; receiving input image data; performing a driving current calculation on the image data according to the mapping table to obtain a driving current value for each backlight partition in the backlight panel; and sending the driving current value to a backlight driving module so that the backlight driving module outputs a driving current to each backlight partition in the backlight panel according to the driving current value.

[0007] In a possible technical solution, a driving current is calculated for image data according to a mapping table to obtain a driving current value for each backlight partition in the backlight panel, including: determining a mapping relationship between pixel grayscale and driving current value based on the mapping table; determining a pixel area corresponding to each backlight partition based on a backlight partition table included in the mapping table; calculating a grayscale value for each pixel area from the image data; and determining a driving current value for each backlight partition based on the pixel area corresponding to each backlight partition and the grayscale value in the pixel area.

[0008] In a possible technical solution, after sending the driving current value to the backlight driving module, the method also includes: obtaining the driving electrical signal value output to the backlight driving module, and receiving the actual electrical signal value fed back by the backlight driving module; based on the actual electrical signal value, determining whether the output power of the backlight driving module exceeds a preset upper limit power; if it exceeds the upper limit power, adjusting the driving electrical signal value output by the backlight driving module based on the driving electrical signal value and the actual electrical signal value.

[0009] In a possible technical solution, the method also includes: decoding the image data to obtain decoded image data; determining the delay between performing a first sending operation and performing a second sending operation, wherein the first sending operation is an operation of sending a driving current value to a backlight driving module, and the second sending operation is an operation of sending the decoded image data to a timing controller; based on the delay, setting the timing of sending the driving current value to the backlight driving module, and setting the timing of sending the decoded image data to the timing controller.

[0010] In one possible technical solution, determining the delay between executing a first sending operation and executing a second sending operation includes: obtaining a liquid crystal flip time of a liquid crystal panel illuminated by a backlight; and determining the delay between executing the first sending operation and executing the second sending operation based on the liquid crystal flip time.

[0011] In a second aspect, an embodiment of the present application provides a backlight control circuit, which includes: a main controller, a backlight controller, a backlight driving module and a backlight panel, the backlight controller includes a configuration module and a data processing module, the main controller is connected to the backlight controller, the backlight driving module is connected to the backlight controller, and the backlight panel is connected to the backlight driving module; the configuration module is used to obtain a preset mapping table representing the mapping relationship between backlight partitions and pixel partitions, and send the mapping table to the data processing module; the data processing module is used to receive input image data from the main controller, calculate the driving current for the image data according to the mapping table, obtain the driving current value of each backlight partition in the backlight panel, and send the driving current value to the backlight driving module; and, decode the image data and send the decoded image data to the timing controller; the backlight driving module is used to output the driving current to each backlight partition in the backlight panel according to the driving current value.

[0012] In a possible technical solution, the data processing module is also used to: determine the mapping relationship between pixel grayscale and driving current value based on a mapping table; determine the pixel area corresponding to each backlight partition based on the backlight partition table included in the mapping table; calculate the grayscale value of each pixel area from the image data; determine the driving current value of each backlight partition based on the pixel area corresponding to each backlight partition and the grayscale value in the pixel area.

[0013] In a possible technical solution, the configuration module is also used to: receive the driving electrical signal value fed back by the data processing module, and receive the actual electrical signal value fed back by the backlight driving module; determine whether the output power of the backlight driving module exceeds a preset upper limit power based on the actual electrical signal value; if it exceeds the upper limit power, determine the driving electrical signal adjustment value based on the driving electrical signal value and the actual electrical signal value; and send a driving electrical signal adjustment instruction to the data processing module based on the driving electrical signal adjustment value, so that the data processing module adjusts the driving electrical signal value output to the backlight driving module.

[0014] In a possible technical solution, the configuration module is also used to: determine the delay between executing a first sending operation and executing a second sending operation, wherein the first sending operation is an operation of sending a driving current value to a backlight driving module, and the second sending operation is an operation of sending decoded image data to a timing controller; based on the delay, send a timing control instruction to the data processing module; the data processing module is also used to: set the timing of sending the driving current value to the backlight driving module and set the timing of sending the image data to the timing controller according to the timing control instruction.

[0015] In a third aspect, an embodiment of the present application provides a display device, comprising: a liquid crystal panel, a timing controller and the backlight control circuit described in the second aspect above, the liquid crystal panel and the timing controller are connected, and the timing controller is connected to the backlight controller in the backlight control circuit; the timing controller is used to receive decoded image data from the backlight controller, and use the decoded image data to drive the liquid crystal panel to display an image.

[0016] The backlight control method, backlight control circuit and display device provided in the embodiment of the present application obtain a mapping table representing the mapping relationship between the backlight partition and the pixel partition, and receive image data, and calculate the driving current of the image data according to the mapping table to obtain the driving current value of each backlight partition in the backlight panel, and send the driving current value to the backlight driving module, so that the backlight driving module outputs the driving current to each backlight partition in the backlight panel according to the driving current value. The embodiment of the present application realizes the separation of the backlight partition and the constant current driving function of each partition from the main controller, and the two functions are integrated into one device for execution, thereby reducing the number of image data conversions, saving the pins of the main controller, and improving the efficiency of the backlight partition driving, and can adapt to the scene with a large number of backlight partitions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A schematic diagram of a flow chart of a backlight control method provided in an embodiment of the present application;

[0021] Figure 2 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0022] Figure 3 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0023] Figure 4 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0024] Figure 5 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the structure of a backlight control circuit provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the structure of another backlight control circuit provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the structure of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present application.

[0029] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present application are only used to distinguish between different steps, devices, modules and other objects, and do not represent any specific technical meanings, nor do they indicate the logical order between them.

[0030] It should also be understood that in this embodiment, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0031] It should also be understood that any component, data or structure mentioned in the embodiments of the present application can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0032] In addition, the term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0033] It should also be understood that the description of the various embodiments in this application focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0035] Technologies, circuits, and devices known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the above-mentioned technologies, circuits, and devices should be considered as part of the specification.

[0036] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. To facilitate the understanding of the embodiments of the present application, the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] In order to solve the technical problems of low backlight partition driving efficiency and a small number of drivable backlight partitions in the prior art, the present application provides a backlight control method that can simultaneously meet the requirements of efficiently driving backlight partitions and driving a large number of backlight partitions.

[0039] Figure 1 A flow chart of a backlight control method provided for an embodiment of the present application. The method can be applied to a display panel, for example, can be executed by a backlight controller in a display panel. In addition, the execution subject of the method can be hardware or software. When the above-mentioned execution subject is hardware, the execution subject can be one or more of the above-mentioned electronic devices. For example, a single electronic device can execute the method, or a plurality of electronic devices can cooperate with each other to execute the method. When the above-mentioned execution subject is software, the method can be implemented as multiple software or software modules, or can be implemented as a single software or software module. No specific limitation is made here.

[0040] like Figure 1 As shown, the method specifically includes:

[0041] Step 101: Obtain a preset mapping table representing a mapping relationship between backlight partitions and pixel partitions.

[0042] In some embodiments, the mapping table can be pre-set in the electronic device that executes the present method. For example, the mapping table is stored in the electronic device that executes the present method by manual setting. The mapping table can represent the correspondence between each backlight partition of the backlight plate and the pixel partition of the liquid crystal panel, and can also represent data such as the correspondence between the driving current and the pixel grayscale, the correspondence between the driving current and the communication interface of the backlight driving module. Generally, the pixel units contained in the backlight plate can be divided in advance, and the number of pixels and the pixel position corresponding to each backlight partition after the division can be set, and the corresponding relationship can be saved in the mapping table. The electronic device that executes the present method can read data such as the pixel position corresponding to each backlight partition from the mapping table.

[0043] Step 102: receiving input image data.

[0044] In some embodiments, the image data may be received from a main controller, and in a display panel, the main controller may be a device such as a SOC.

[0045] Step 103 , calculating the driving current of the image data according to the mapping table to obtain the driving current value of each backlight partition in the backlight panel.

[0046] In some embodiments, the electronic device executing the present method can decode the image data to determine the grayscale data (or brightness data) of each pixel, and then determine the grayscale data of the pixel corresponding to each backlight partition based on the mapping table, and then calculate the corresponding driving current value.

[0047] Step 104: sending the driving current value to the backlight driving module, so that the backlight driving module outputs the driving current to each backlight partition in the backlight panel according to the driving current value.

[0048] In some embodiments, the backlight driving module may include multiple backlight driving modules, each backlight driving module corresponds to at least one backlight partition, and each backlight partition includes at least one light-emitting unit (e.g., Mini-LED). The backlight driving module can drive at least one light-emitting unit contained in each backlight partition connected thereto. Generally, the backlight driving module can be a constant current driving chip, which receives an input driving current value, outputs a corresponding current, and drives each light-emitting unit in the corresponding backlight partition to emit light.

[0049] The backlight control method provided in the embodiment of the present application obtains a mapping table representing the mapping relationship between the backlight partition and the pixel partition, receives image data, calculates the driving current of the image data according to the mapping table, obtains the driving current value of each backlight partition in the backlight panel, and sends the driving current value to the backlight driving module, so that the backlight driving module outputs the driving current to each backlight partition in the backlight panel according to the driving current value. The embodiment of the present application realizes the separation of the backlight partition and the constant current driving function of each partition from the main controller SOC, and the two functions are integrated into one device for execution, thereby reducing the number of image data conversions, saving the pins of the main controller, and improving the efficiency of the partition backlight drive, and can adapt to the scene with a large number of backlight partitions.

[0050] In some optional implementations of this embodiment, such as Figure 2 As shown, step 103 includes:

[0051] Step 1031: Determine a mapping relationship between pixel grayscale and driving current value based on a mapping table.

[0052] The mapping table may include mapping relationship data indicating the corresponding relationship between pixel grayscale and driving current value, that is, different driving current values ​​may cause the backlight driving module to output different driving currents, and different driving currents may cause the light-emitting unit to emit light of different brightness, thereby generating different pixel grayscales.

[0053] Step 1032: Determine the pixel area corresponding to each backlight partition based on the backlight partition table included in the mapping table.

[0054] The backlight partition table may be pre-set in the electronic device executing the method. According to the backlight partition table, the pixel area corresponding to each backlight partition in the liquid crystal panel may be determined, and the pixel area is represented by the coordinates of the pixels.

[0055] Step 1033, calculating the grayscale value of each pixel area from the image data.

[0056] The electronic device can decode the image data and extract the grayscale value of each pixel. Usually, the value of each pixel contained in the image data is expressed in YCbCr format, where the Y component represents the pixel grayscale. The grayscale value of a single pixel area can be obtained by calculating the grayscale values ​​of each pixel included in the pixel area. For example, the grayscale value of a single pixel area can be the average value, median value, etc. of each pixel included in the pixel area.

[0057] Step 1034 , determining the driving current value of each backlight partition based on the pixel area corresponding to each backlight partition and the grayscale value in the pixel area.

[0058] Specifically, according to the pixel position corresponding to each backlight partition, the number of pixels contained in each backlight partition and the grayscale value of each pixel contained therein can be determined, and then the driving current value of each backlight partition can be obtained by using the above mapping relationship data.

[0059] As an example, the driving current value corresponding to the i-th backlight partition may be calculated according to the following formula (1):

[0060] Q (i)=A*[S(1)+S(2)+…+S(n)] / n (1)

[0061] Wherein, A represents the conversion coefficient between pixel grayscale and backlight driving current, which can be adjusted according to the actual display effect, n represents the number of pixels corresponding to the i-th backlight partition, S represents the grayscale value corresponding to a single pixel, [S(1)+S(2)+…+S(n)] / n represents taking the average value of n pixels, and the average value is the grayscale value of the pixel area corresponding to the i-th backlight partition, and Q represents the driving current value corresponding to the i-th backlight partition.

[0062] This embodiment uses mapping relationship data and a backlight partition table to calculate the driving current value of each backlight partition according to the grayscale of each pixel in the image data. The number of pixels corresponding to each backlight partition can be flexibly set according to demand, thereby helping to improve the scene adaptability of backlight control.

[0063] In some optional implementations of this embodiment, such as Figure 3 As shown, after step 104, the method further includes:

[0064] Step 105 , obtaining the driving electrical signal value output to the backlight driving module, and receiving the actual electrical signal value fed back by the backlight driving module.

[0065] The driving electrical signal value may include a current value and / or a voltage value. The current value may be the sum of the driving current values ​​of each backlight partition calculated according to the above formula (1), and the voltage value may be the power supply voltage value output to the backlight driving module. After the backlight driving module outputs the current, the actual output current and / or voltage magnitude may be collected to obtain an actual electrical signal value representing the actual output current and / or voltage magnitude, and the actual electrical signal value may be fed back to the electronic device executing the method.

[0066] Step 106: determining whether the output power of the backlight driving module exceeds a preset upper limit power based on the actual electrical signal value.

[0067] Specifically, the total output current and the total output voltage of the backlight driving module may be multiplied to obtain the output power, and the output power may be compared with a preset upper limit power.

[0068] Step 107 : If the upper limit power is exceeded, the driving electrical signal value output by the backlight driving module is adjusted based on the driving electrical signal value and the actual electrical signal value.

[0069] In one example, the driving power can be calculated based on the driving electrical signal value, and the driving power and the actual output power are compared to calculate the power conversion efficiency. Then, based on the power conversion efficiency, an adjustment coefficient of the driving electrical signal value is set, and the adjustment coefficient is multiplied by the above driving electrical signal value to obtain the adjustment value of the driving electrical signal. According to the adjustment value, the driving electrical signal value output by the backlight driving module can be adjusted so that the output power of the backlight driving module does not exceed the upper limit power. Optionally, the driving electrical signal value output by the backlight driving module may include a driving current value, that is, the above adjustment value is a driving current adjustment value. According to the driving current adjustment value, the driving current value output by the backlight driving module can be adjusted so that the output power of the backlight driving module is within a preset safe power range.

[0070] This embodiment detects the actual output electric signal value of the backlight driving module, and adjusts the driving electric signal value of the backlight driving module when the output power is too large, thereby reducing the risk of failure caused by excessive backlight driving power.

[0071] In some optional implementations of this embodiment, after step 106, the method further includes:

[0072] If the output power of the backlight driving module exceeds the upper limit power, a voltage adjustment instruction is sent to the backlight driving module to reduce the supply voltage of the backlight driving module to a target voltage.

[0073] Specifically, a voltage adjustment coefficient can be set, and a voltage adjustment instruction can be generated according to the voltage adjustment coefficient, and the voltage adjustment instruction can be sent to the backlight driving module, so that the power supply of the backlight driving module reduces the supply voltage, thereby achieving the purpose of limiting power consumption. The above-mentioned target voltage is the adjusted supply voltage, and the target voltage can be calculated according to the voltage adjustment coefficient, or the fixed supply voltage amplitude can be reduced to make the supply voltage reach the target voltage.

[0074] This embodiment adjusts the supply voltage of the backlight driving module to reduce the output power when the output power of the backlight driving module is too high, thereby further improving the flexibility of limiting the output power of the backlight driving module and helping to more effectively avoid excessive output power.

[0075] In some optional implementations of this embodiment, such as Figure 4 As shown, the method also includes:

[0076] Step 108: decode the image data to obtain decoded image data.

[0077] The electronic device executing the method can decode the image data, and determine data such as the color value of each pixel as decoded image data.

[0078] Step 109: Determine the delay between executing the first sending operation and executing the second sending operation.

[0079] The first sending operation is an operation of sending a driving current value to the backlight driving module, and the second sending operation is an operation of sending decoded image data to the timing controller.

[0080] The timing controller (TCON) is used to refresh the display screen of the liquid crystal panel. In order to synchronize the light-emitting time of the backlight panel with the time of inversion of the liquid crystal molecules of the liquid crystal panel, a delay between the first sending operation and the execution of the second sending operation can be set.

[0081] Step 110: Based on the delay, set the timing of sending the driving current value to the backlight driving module and set the timing of sending the image data to the timing controller.

[0082] According to the set timing, the driving current value and the image data can be sent to the backlight driving module and the timing controller at the corresponding time, so that the time of refreshing the backlight signal and the time of refreshing the image display are synchronized, thereby improving the display effect.

[0083] In some optional implementations of this embodiment, such as Figure 5 As shown, step 109 includes:

[0084] Step 1091, obtaining the liquid crystal flipping time of the liquid crystal panel illuminated by the backlight.

[0085] The liquid crystal flipping time can be obtained by testing. For example, a photoelectric probe can be set on the liquid crystal panel to detect the delay time between the timing output of the image data and the liquid crystal flipping time, and the delay time is used as the liquid crystal flipping time.

[0086] Step 1092: Determine a delay between executing the first sending operation and executing the second sending operation based on the liquid crystal flipping time.

[0087] Specifically, the liquid crystal flipping time can be used as the delay between executing the first sending operation and executing the second sending operation, or it can be adjusted based on the liquid crystal flipping time according to actual needs to obtain the delay between the first sending operation and executing the second sending operation.

[0088] This embodiment obtains the liquid crystal flip time and sets the delay between executing the first sending operation and executing the second sending operation based on the liquid crystal flip time, which helps to more accurately determine the delay in data occurrence, and further synchronizes the time when the backlight signal is refreshed with the time when the image display is refreshed, thereby improving the display effect.

[0089] Figure 6 This is a schematic diagram of the structure of a backlight control circuit provided in an embodiment of the present application. The circuit is generally used in a display panel, and specifically includes: a main controller 601, a backlight controller 602, a backlight driving module 603, and a backlight panel 604. Among them, the backlight controller 602 can execute the backlight control method described in the above embodiments.

[0090] The backlight controller 602 includes a configuration module 6021 and a data processing module 6022 . The main controller 601 is connected to the backlight controller 602 . The backlight driving module 603 is connected to the backlight controller 602 . The backlight panel 604 is connected to the backlight driving module 603 .

[0091] The backlight driving module 603 includes multiple backlight driving modules (for example, constant current driving ICs). A light-emitting unit array can be set on the backlight panel 604. The light-emitting unit array constitutes multiple backlight partitions. Each backlight partition is connected to a corresponding backlight driving module. The backlight driving module outputs a driving current to at least one connected backlight partition, so that at least one backlight partition emits light.

[0092] like Figure 6 As shown, the configuration module 6021 and the data processing module 6022 can transmit backlight configuration data and various control instructions, that is, the configuration module 6021 can perform various function configurations on the data processing module 6022, and the data processing module 6022 processes the image data at high speed according to the configured functions. For example, the configuration module can be used to configure the conversion algorithm of the liquid crystal grayscale and the driving current for the data processing module. Figure 6 As shown, the data processing module 6022 can be connected to the input port and the output port of the backlight controller 602 to receive the image data from the main controller 601 and output the driving current value to the backlight driving module 603 .

[0093] The main controller 601 may be a device for generating image data and controlling the display panel as a whole. Typically, the main controller may be a SOC chip. The configuration module 6021 included in the backlight controller 602 may be various types of electronic devices with logic control functions, such as an MCU. The data processing module 6022 may be an electronic device that processes image data. Typically, the data processing speed of the data processing module 6022 is higher than that of the configuration module 6021. For example, the data processing module 6022 may be an FPGA, which may decode the image data and calculate the driving current value of each backlight partition.

[0094] The configuration module 6021 and the data processing module 6022 in the backlight controller 602 may be integrated into the same chip, or may be separate chips disposed in the same circuit board.

[0095] The configuration module 6021 is used to obtain a preset mapping table representing the mapping relationship between the backlight partitions and the pixel partitions, and send the mapping table to the data processing module 6022 .

[0096] The data processing module 6022 is used to receive input image data from the main controller 601, calculate the driving current of the image data according to the mapping table, obtain the driving current value of each backlight partition in the backlight panel 604, and send the driving current value to the backlight driving module 603; and, decode the image data and send the decoded image data to the timing controller.

[0097] A constant current dedicated conversion protocol table can be pre-established in the data processing module 6022, and according to the table, the grayscale can be converted into a driving current value for different types of backlight drive modules. The decoded image data can include data such as color values ​​corresponding to each pixel unit on the liquid crystal panel, and after sending these data to the timing controller, the timing controller can drive the liquid crystal panel to refresh the displayed image.

[0098] The backlight driving module 603 is used to output a driving current to each backlight partition in the backlight panel 604 according to the driving current value.

[0099] In this embodiment, the configuration module 6021 and the data processing module 6022 are combined to execute each step of the above-mentioned backlight control method.

[0100] The backlight control circuit provided in the embodiment of the present application realizes that the backlight controller performs backlight partition control and drive current calculation by setting a configuration module and a data processing module in the backlight controller, thereby reducing the number of image data conversions. The two functions of backlight partition control and drive current calculation are separated from the main controller, saving pins of the main controller, reducing the data processing volume of the main controller, and improving the efficiency of backlight partition driving. At the same time, it can adapt to scenarios with a large number of backlight partitions.

[0101] In some optional implementations of this embodiment, the data processing module 6022 is further configured to perform the following steps:

[0102] First, based on the mapping table, the mapping relationship between the pixel grayscale and the driving current value is determined.

[0103] The mapping table may include mapping relationship data indicating the corresponding relationship between pixel grayscale and driving current value.

[0104] Then, based on the backlight partition table included in the mapping table, the pixel area corresponding to each backlight partition is determined.

[0105] The backlight partition table may be pre-set in the data processing module 6022 .

[0106] Then, the grayscale value of each pixel area is calculated from the image data.

[0107] Finally, based on the pixel area corresponding to each backlight partition and the grayscale value in the pixel area, the driving current value of each backlight partition is determined.

[0108] The steps in this embodiment are similar to those in the above Figure 2 The steps in the illustrated embodiments are basically the same and will not be described in detail here.

[0109] In this embodiment, the driving current value of each backlight partition is calculated by the data processing module, so that the number of pixels corresponding to each backlight partition can be flexibly set according to demand, thereby helping to improve the scene adaptability of backlight control.

[0110] In some optional implementations of this embodiment, the configuration module 6021 is further configured to perform the following steps:

[0111] First, the driving electrical signal value fed back by the data processing module 6022 is received, and the actual electrical signal value fed back by the backlight driving module 603 is received.

[0112] The driving electrical signal value may include a current value and / or a voltage value. After calculating the driving current value, the data processing module 6022 may feed back the driving electrical signal value including the driving current value to the configuration module 6021. After outputting the current, the backlight driving module 603 may collect the actual output current and / or voltage magnitude, obtain the actual electrical signal value representing the actual output current and / or voltage magnitude, and feed back the actual electrical signal value to the electronic device executing the method.

[0113] Then, based on the actual electrical signal value, it is determined whether the output power of the backlight driving module 603 exceeds a preset upper limit power.

[0114] Then, if the upper limit power is exceeded, the drive electrical signal adjustment value is determined based on the drive electrical signal value and the actual electrical signal value;

[0115] Finally, based on the driving electrical signal adjustment value, a driving electrical signal adjustment instruction is sent to the data processing module 6022 , so that the data processing module 6022 adjusts the driving electrical signal value output to the backlight driving module 603 .

[0116] Among them, the driving electrical signal adjustment instruction may include a driving electrical signal adjustment value (such as a driving current adjustment value). After receiving the driving electrical signal adjustment instruction, the data processing module 6022 can adjust the driving electrical signal value (such as a driving current value) output to the backlight driving module 603.

[0117] The steps in this embodiment are similar to those in the above Figure 3 The steps in the corresponding embodiments are basically the same and will not be described again here.

[0118] This embodiment detects the actual output electric signal value of the backlight driving module, and adjusts the driving electric signal value of the backlight driving module when the output power is too large, thereby reducing the risk of failure caused by excessive backlight driving power.

[0119] In some optional implementations of this embodiment, the configuration module 6021 is further configured to perform the following steps:

[0120] If the output power of the backlight driving module 603 exceeds the upper limit power, a voltage adjustment instruction is sent to the backlight driving module 603 to reduce the supply voltage of the backlight driving module 603 to a target voltage.

[0121] Specifically, a voltage adjustment coefficient can be set, and a voltage adjustment instruction can be generated according to the voltage adjustment coefficient, and the voltage adjustment instruction can be sent to the backlight driving module 603, so that the power supply of the backlight driving module 603 reduces the power supply voltage, thereby achieving the purpose of limiting power consumption. The above-mentioned target voltage, that is, the adjusted power supply voltage, can be calculated according to the voltage adjustment coefficient to obtain the target voltage, or the fixed power supply voltage amplitude can be reduced to make the power supply voltage reach the target voltage.

[0122] Configuration module 6021 can be Figure 6 The output port shown sends the voltage adjustment instruction to the backlight driving module 603, or forwards the voltage adjustment instruction to the backlight driving module 603 through the data processing module 6022.

[0123] This embodiment adjusts the supply voltage of the backlight driving module to reduce the output power when the output power of the backlight driving module is too high, thereby further improving the flexibility of limiting the output power of the backlight driving module and helping to more effectively avoid excessive output power.

[0124] In some optional implementations of this embodiment, the configuration module 6021 is further configured to perform the following steps:

[0125] Determine the delay between executing a first sending operation and executing a second sending operation, wherein the first sending operation is an operation of sending a driving current value to the backlight driving module 603, and the second sending operation is an operation of sending decoded image data to the timing controller; based on the delay, send a timing control instruction to the data processing module 6022.

[0126] The data processing module 6022 is also used for:

[0127] According to the timing control instruction, the timing of sending the driving current value to the backlight driving module 603 is set, and the timing of sending the image data to the timing controller is set.

[0128] like Figure 7As shown, the data processing module 6022 can send the image data to the timing controller (TCON) through the output port P2, and send the driving current value to the backlight driving module 603 through the output port P1. After receiving the image data, the timing controller can convert the image data into the data signal format required by the data driving circuit on the liquid crystal panel, and transmit these data signals to the data driving circuit. The data driving circuit drives the liquid crystal molecules of each pixel unit on the liquid crystal panel to deflect, and at the same time, the light-emitting unit on the backlight board is driven to light up by the backlight driving module 603, thereby realizing the display of the picture on the liquid crystal panel.

[0129] The steps performed by the configuration module 6021 and the data processing module 6022 in this embodiment are similar to those described above. Figure 4 The steps described in the corresponding embodiments are basically the same and will not be repeated here.

[0130] The data processing module in this embodiment can send the driving current value and image data to the backlight driving module and the timing controller at the corresponding time according to the set timing, so that the time of refreshing the backlight signal and the time of refreshing the image display are synchronized, thereby improving the display effect.

[0131] Figure 8 A schematic diagram of the structure of a display device 800 provided in an embodiment of the present application is shown in FIG. Figure 8 As shown, the display device includes: a liquid crystal panel 801, a timing controller 802 and the above-mentioned backlight control circuit 600, the liquid crystal panel 801 is connected to the timing controller 802, and the timing controller 802 is connected to the backlight controller in the backlight control circuit.

[0132] The timing controller 802 is used to receive the decoded image data from the backlight controller, and drive the liquid crystal panel to display an image using the decoded image data.

[0133] In addition, the display device Figure 8 In addition to the parts shown, it may also include a memory for storing data and programs, a processor for running application programs, a data transmission bus, various data interfaces (such as a network interface, a user interface), etc.

[0134] The display device provided in the embodiment of the present application, by applying the above-mentioned backlight control circuit, realizes that the backlight controller performs backlight partition control and drive current calculation, thereby reducing the number of image data conversions, and the two functions of backlight partition control and drive current calculation are separated from the main controller, saving pins of the main controller, reducing the data processing volume of the main controller, and improving the efficiency of backlight partition driving. At the same time, it can adapt to scenarios with a large number of backlight partitions.

[0135] The professionals should further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different circuits to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0136] The steps of the circuits or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, software modules executed by a processor, or a combination of the two. The software modules may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0137] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0138] The above description is only a specific implementation of the present application, so that those skilled in the art can 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 the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A backlight control method, characterized in that: The method comprises: Acquire a preset mapping table representing a mapping relationship between backlight partitions and pixel partitions; receiving input image data; According to the mapping table, the driving current of the image data is calculated to obtain the driving current value of each backlight partition in the backlight panel; The driving current value is sent to a backlight driving module, so that the backlight driving module outputs a driving current to each backlight partition in the backlight panel according to the driving current value.

2. The method according to claim 1, characterized in that The step of calculating the driving current of the image data according to the mapping table to obtain the driving current value of each backlight partition in the backlight panel includes: Based on the mapping table, determining a mapping relationship between pixel grayscale and driving current value; Based on the backlight partition table included in the mapping table, determining the pixel area corresponding to each backlight partition; Calculate the grayscale value of each pixel area from the image data; The driving current value of each backlight partition is determined based on the pixel area corresponding to each backlight partition and the grayscale value in the pixel area.

3. The method according to claim 1, characterized in that After sending the driving current value to the backlight driving module, the method further includes: Acquire the driving electrical signal value output to the backlight driving module, and receive the actual electrical signal value fed back by the backlight driving module; Based on the actual electrical signal value, determining whether the output power of the backlight driving module exceeds a preset upper limit power; If the upper limit power is exceeded, the driving electrical signal value output by the backlight driving module is adjusted based on the driving electrical signal value and the actual electrical signal value.

4. The method according to claim 1, characterized in that: The method further comprises: Decoding the image data to obtain decoded image data; Determine a delay between performing a first sending operation and performing a second sending operation, wherein the first sending operation is an operation of sending the driving current value to the backlight driving module, and the second sending operation is an operation of sending the decoded image data to the timing controller; Based on the delay, a timing for sending a driving current value to the backlight driving module is set, and a timing for sending the decoded image data to a timing controller is set.

5. The method according to claim 4, characterized in that The determining of the delay between executing the first sending operation and executing the second sending operation includes: Obtaining a liquid crystal flipping time of a liquid crystal panel illuminated by the backlight panel; Based on the liquid crystal flipping time, a delay between performing a first sending operation and performing a second sending operation is determined.

6. A backlight control circuit, characterized in that: The circuit comprises: a main controller, a backlight controller, a backlight driving module and a backlight board, the backlight controller comprises a configuration module and a data processing module, the main controller is connected to the backlight controller, the backlight driving module is connected to the backlight controller, and the backlight board is connected to the backlight driving module; The configuration module is used to obtain a preset mapping table representing a mapping relationship between backlight partitions and pixel partitions, and send the mapping table to the data processing module; The data processing module is used to receive input image data from the main controller, calculate the driving current of the image data according to the mapping table, obtain the driving current value of each backlight partition in the backlight panel, and send the driving current value to the backlight driving module; and decode the image data and send the decoded image data to the timing controller; The backlight driving module is used to output a driving current to each backlight partition in the backlight panel according to the driving current value.

7. The circuit according to claim 6, characterized in that The data processing module is also used for: Based on the mapping table, determining a mapping relationship between pixel grayscale and driving current value; Based on the backlight partition table included in the mapping table, determining the pixel area corresponding to each backlight partition; Calculate the grayscale value of each pixel area from the image data; The driving current value of each backlight partition is determined based on the pixel area corresponding to each backlight partition and the grayscale value in the pixel area.

8. The circuit according to claim 6, characterized in that The configuration module is also used to: receiving the driving electrical signal value fed back by the data processing module, and receiving the actual electrical signal value fed back by the backlight driving module; Based on the actual electrical signal value, determining whether the output power of the backlight driving module exceeds a preset upper limit power; If the upper limit power is exceeded, determining a driving electrical signal adjustment value based on the driving electrical signal value and the actual electrical signal value; Based on the driving electrical signal adjustment value, a driving electrical signal adjustment instruction is sent to the data processing module, so that the data processing module adjusts the driving electrical signal value output to the backlight driving module.

9. The circuit according to claim 6, characterized in that The configuration module is also used to: Determine a delay between performing a first sending operation and performing a second sending operation, wherein the first sending operation is an operation of sending the driving current value to the backlight driving module, and the second sending operation is an operation of sending the decoded image data to the timing controller; Based on the delay, sending a timing control instruction to the data processing module; The data processing module is also used for: According to the timing control instruction, the timing of sending the driving current value to the backlight driving module is set, and the timing of sending the image data to the timing controller is set.

10. A display device, characterized in that: include: A liquid crystal panel, a timing controller and a backlight control circuit according to any one of claims 6 to 9, wherein the liquid crystal panel is connected to the timing controller, and the timing controller is connected to the backlight controller in the backlight control circuit; The timing controller is used to receive decoded image data from the backlight controller, and drive the liquid crystal panel to display an image using the decoded image data.

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