Power supply voltage adjusting method and system of LED backlight module

Abstract

The invention provides a power supply voltage adjusting method and system of an LED backlight module, and relates to the technical field of display, and the method comprises the steps: when the LED backlight module displays a backlight image, determining a voltage coefficient according to the image data of the backlight image and a preset mapping relation between a gray value and the voltage coefficient, calling a current signal according to the voltage coefficient, and adjusting the power supply voltage of the LED backlight module according to the current signal; and before the display of the current frame of backlight image is completed and the display of the next frame of backlight image is started, the adjustment of the power supply voltage required for displaying the next frame of backlight image is completed. The display effect is improved, and power consumption is reduced.

Description

Technical Field

[0001] This application relates to the field of display technologies, and in particular, to a method and system for regulating the supply voltage of an LED backlight module. Background Art

[0002] With the increasingly widespread application of liquid crystal terminal products with light-emitting diode (LED) zoned dimming, the terminal products include a backlight control circuit and an LED backlight module, and the backlight control circuit controls the LED backlight module supporting zoned dimming to achieve image display. Among the many dimensions of product competition, the display effect and power consumption of the LED backlight module are two crucial dimensions. In actual products, the display effect and power consumption often conflict with each other.

[0003] To ensure the display effect, the existing solution is that when the LED backlight module is powered on, the backlight control circuit provides a fixed voltage (referred to as V LED ) to the LED backlight module. In this power supply mode, if the provided V LED is too low, the voltage in the channel of the LED backlight module is lower than the turning voltage, resulting in the display brightness not meeting the expectation; if the provided V LED is too high, there are problems such as energy waste and serious overheating of the driving chip. Summary of the Invention

[0004] This application provides a method and system for regulating the supply voltage of an LED backlight module, which solves the problems of energy waste and serious overheating of the driving chip existing in the prior art for the LED backlight module.

[0005] To achieve the above object, this application adopts the following technical solutions:

[0006] In a first aspect, this application provides a method for regulating the supply voltage of an LED backlight module, and the method includes:

[0007] Obtain the next-frame backlight image of the currently displayed backlight image. Determine a target voltage coefficient according to the next-frame backlight image, and determine a target current signal based on the target voltage coefficient. During a target time period, regulate the supply voltage of the LED backlight module to a target voltage according to the target current signal, and the voltage in each channel of the regulated LED backlight module is greater than a preset turning voltage. Wherein, the target time period is the time period after the currently displayed backlight image is displayed and before the next-frame backlight image is displayed.

[0008] Through a method for adjusting the supply voltage of an LED backlight module provided by this application, when the LED backlight module displays the current frame of the backlight image, the voltage coefficient can be determined according to the image data of the next frame of the backlight image, and the supply voltage of the LED backlight module can be adjusted according to the voltage coefficient. Without affecting the display of the current frame of the backlight image, before the next frame of the backlight image is displayed, the adjustment of the supply voltage required for displaying the next frame of the backlight image is completed. That is, the adjustment of the supply voltage required for the backlight image is completed between frames, enabling the LED backlight module to display normally while reducing the power consumption of the LED backlight module.

[0009] In some possible implementation manners, the LED backlight module includes N backlight zones, where N is an integer greater than 1. The method for determining the target voltage coefficient according to the next frame of the backlight image is as follows: obtain a plurality of gray-scale data corresponding to the N backlight zones of the backlight module in the next frame of the backlight image; determine the corresponding target voltage coefficient according to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data. Based on this technology, it can ensure the normal display of the highlighted part in the next frame of the backlight image, thereby guaranteeing the display effect.

[0010] In some possible implementation manners, determining the corresponding target voltage coefficient according to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data is specifically: determining the target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to the preset mapping relationship between the gray-scale value and the voltage coefficient.

[0011] In some possible implementation manners, before determining the target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to the preset mapping relationship between the gray-scale value and the voltage coefficient, obtain M test images within a preset gray-scale range, and each test image corresponds to a gray-scale value. When the LED backlight module displays the M test images frame by frame, obtain the voltage coefficient corresponding to each gray-scale value. The mapping relationship between each gray-scale value and the voltage coefficient corresponding to the gray-scale value is the preset mapping relationship.

[0012] In some possible implementation manners, when the LED backlight module displays the M test images frame by frame, obtaining the voltage coefficient corresponding to each gray-scale value is specifically: when the LED backlight module displays the M test images frame by frame, adjust the supply voltage of the LED backlight module frame by frame by adjusting the voltage coefficient. When the voltage in each channel of the N backlight zones of the LED backlight module after adjustment is greater than the preset turning voltage, save the voltage coefficient. Obtain the preset mapping relationship according to the gray-scale value of each test image and the voltage coefficient corresponding to the gray-scale value. Based on the preset mapping relationship, the voltage coefficient corresponding to the next frame of the backlight image can be quickly determined when adjusting the supply voltage of the LED backlight module.

[0013] In some possible implementation manners, a calibration instruction is received, and a mapping relationship between each gray value within a preset gray range and a voltage coefficient corresponding to the gray value is generated according to the calibration instruction, and the preset mapping relationship is updated by using the newly generated mapping relationship. Based on this technology, the preset mapping relationship can be updated regularly, making the power supply voltage regulation more accurate.

[0014] In some possible implementation manners, the LED backlight module displays M frames of test images frame by frame. Specifically, the LED backlight module displays M frames of test images frame by frame in ascending order of the image gray values. The power supply voltage of the LED backlight module is adjusted frame by frame by adjusting the voltage coefficient. Specifically, the power supply voltage of the LED backlight module is increased frame by frame by increasing the voltage coefficient. When the voltages in each channel of the LED backlight module after adjustment are not all greater than a preset turning voltage, the power supply voltage of the LED backlight module is continuously adjusted by increasing the voltage coefficient. When the voltages in each channel of the LED backlight module after adjustment are all greater than the preset turning voltage, the voltage coefficient is saved.

[0015] In some possible implementation manners, the preset gray range is [0, 2 K -1], K is the bit depth of the image displayed by the LED backlight module, and each gray value within the preset gray range corresponds to a voltage coefficient.

[0016] In some other possible implementation manners, the voltage coefficient corresponding to each gray value is obtained. Specifically, all the gray values within the preset gray range are equally spaced into step intervals, and the gray values within one step interval correspond to one voltage coefficient.

[0017] In some other possible implementation manners, the preset gray range includes multiple gray ranges. Within the first gray range, consecutive S gray values correspond to one voltage coefficient; within the second gray range, consecutive T gray values correspond to one voltage coefficient. Among them, the first gray range and the second gray range are two gray ranges within the preset gray range. The gray values within the first gray range are less than the gray values within the second gray range, S is less than T, and both S and T are integers greater than 1. Based on this technology, during the power supply voltage regulation process, the current signal can be quickly determined according to the actual situation, making the power supply voltage regulation more efficient. Moreover, different voltage regulations correspond to high and low gray levels, making the adjustment more precise and the picture display more delicate.

[0018] Second aspect, the present application provides a method for adjusting the supply voltage of an LED backlight module, the method comprising: obtaining at least one partition image in the backlight images currently displayed by N backlight partitions of the LED backlight module. Receiving a new partition image. Wherein, the new partition image is the data of a partition image in the currently displayed backlight image, or the new partition image is the data of a partition image in the next frame of the backlight image of the currently displayed backlight image. Determining a target voltage coefficient according to at least one partition image in the currently displayed backlight image and the new partition image, and determining a target current signal based on the target voltage coefficient. Adjusting the supply voltage of the LED backlight module to a target voltage according to the target current signal within a target time period, and the voltage in each channel of the adjusted LED backlight module is greater than a preset turning voltage. Wherein, the target time period is the time period from receiving the gray-scale data of the new partition image to sending the gray-scale data to the backlight driver.

[0019] Through the method for adjusting the supply voltage of an LED backlight module provided by the present application, when the LED backlight module displays the current frame of the backlight image, the voltage coefficient can be determined according to at least one partition image and the new partition image in the currently displayed backlight image, and according to the voltage coefficient, the supply voltage required for the LED backlight module to display the currently displayed backlight image and the new partition image can be immediately adjusted, so that the LED backlight module can display normally, and at the same time, the power consumption of the LED backlight module is reduced.

[0020] In some possible implementation manners, determining a target voltage coefficient according to at least one partition image in the currently displayed backlight image and the new partition image specifically includes: obtaining the gray-scale data of at least one partition image in the currently displayed backlight image and the gray-scale data with the largest gray-scale value among the gray-scale data of the new partition image. Determining the target voltage coefficient according to the gray-scale data with the largest gray-scale value. Based on this technology, it can be ensured that the highlighted parts in the currently displayed backlight image and the new partition image are displayed normally, so as to ensure the display effect.

[0021] In some possible implementation manners, determining the target voltage coefficient according to the gray-scale data with the largest gray-scale value specifically includes: determining the target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to a preset mapping relationship between the gray-scale value and the voltage coefficient.

[0022] In some possible implementation manners, before determining the target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to the preset mapping relationship between the gray-scale value and the voltage coefficient, obtaining M test images within a preset gray-scale range, and each test image corresponds to a gray-scale value. When the LED backlight module displays the M test images frame by frame, obtaining the voltage coefficient corresponding to each gray-scale value. Wherein, the mapping relationship between each gray-scale value and the voltage coefficient corresponding to the gray-scale value is a preset mapping relationship.

[0023] In some possible implementation manners, when the LED backlight module displays M frames of test images frame by frame, the voltage coefficient corresponding to each gray value is obtained. Specifically, when the LED backlight module displays M frames of test images frame by frame, the supply voltage of the LED backlight module is adjusted frame by frame by adjusting the voltage coefficient. When the voltages in each channel of the N backlight zones of the LED backlight module after adjustment are all greater than a preset turning voltage, the voltage coefficient is saved. A preset mapping relationship is obtained based on the gray value of each frame of test image and the voltage coefficient corresponding to the gray value. Based on the preset mapping relationship, the voltage coefficient corresponding to the next frame of backlight image can be quickly determined when adjusting the supply voltage of the LED backlight module.

[0024] In some possible implementation manners, a calibration instruction is received, and a mapping relationship between each gray value within a preset gray range and the voltage coefficient corresponding to the gray value is generated according to the calibration instruction, and the preset mapping relationship is updated with the newly generated mapping relationship. Based on this technology, the preset mapping relationship can be updated regularly to make the adjustment of the supply voltage more accurate.

[0025] In some possible implementation manners, the LED backlight module displays M frames of test images frame by frame. Specifically, the LED backlight module displays M frames of test images frame by frame in ascending order of the image gray values. The supply voltage of the LED backlight module is adjusted frame by frame by adjusting the voltage coefficient. Specifically, the supply voltage of the LED backlight module is increased frame by frame by increasing the voltage coefficient. When the voltages in each channel of the LED backlight module after adjustment are not all greater than the preset turning voltage, the supply voltage of the LED backlight module is continuously adjusted by increasing the voltage coefficient. When the voltages in each channel of the LED backlight module after adjustment are all greater than the preset turning voltage, the voltage coefficient is saved.

[0026] In some possible implementation manners, the preset gray range is [0, 2 K ^K - 1], where K is the bit depth of the image displayed by the LED backlight module, and each gray value within the preset gray range corresponds to a voltage coefficient.

[0027] In some other possible implementation manners, the voltage coefficient corresponding to each gray value is obtained. Specifically, all gray values within the preset gray range are equally spaced into step intervals, and the gray values within one step interval correspond to one voltage coefficient.

[0028] In some other possible implementation manners, the preset gray scale range includes multiple gray scale ranges. Within the first gray scale range, every consecutive S gray scale values correspond to one voltage coefficient. Within the second gray scale range, every consecutive T gray scale values correspond to one voltage coefficient. Herein, the first gray scale range and the second gray scale range are two gray scale ranges within the preset gray scale range. The gray scale values within the first gray scale range are less than those within the second gray scale range, S is less than T, and both S and T are integers greater than 1. Based on this technology, during the process of regulating the power supply voltage, the current signal can be quickly determined according to the actual situation, making the regulation of the power supply voltage more efficient. Moreover, different voltage regulations correspond to high and low gray levels, making the adjustment more accurate and the picture display more delicate.

[0029] Among them, the methods described in the above first aspect and second aspect can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions. For example, a processing module or unit, a display module or unit, etc.

[0030] In a third aspect, the present application provides a power supply voltage regulation system for an LED backlight module, including a power supply module, a backlight control module, and an image source module. The backlight control module is respectively connected to the power supply module and the image source module. The LED backlight module includes N backlight zones, where N is an integer greater than 1. The image source module is configured to send the next-frame backlight image of the currently displayed backlight image to the backlight control module. The backlight control module is configured to receive the next-frame backlight image, determine a target voltage coefficient according to the next-frame backlight image, and determine a target current signal based on the target voltage coefficient. The backlight control module is further configured to send the target current signal to the power supply module within a target time period. Herein, the target time period is the time period after the currently displayed backlight image is displayed and before the next-frame backlight image is displayed. The power supply module is configured to regulate the power supply voltage of the LED backlight module to a target voltage according to the target current signal within the target time period; the voltages within each channel of the regulated LED backlight module are all greater than a preset turning voltage.

[0031] Fourth aspect, the present application provides a power supply voltage regulation system for an LED backlight module, including a power supply module, a backlight control module, and an image source module. The backlight control module is respectively connected to the power supply module and the image source module. The LED backlight module includes N backlight zones, where N is an integer greater than 1. The image source module is configured to send a new zone image to the backlight control module. The new zone image is a zone image data in the currently displayed backlight image, or the new zone image is a zone image data in the next frame of the backlight image of the currently displayed backlight image. The backlight control module is configured to receive the new zone image, determine a target voltage coefficient based on at least one zone image in the currently displayed backlight image and the new zone image, and determine a target current signal based on the target voltage coefficient. The backlight control module is further configured to send the target current signal to the power supply module within a target time period. Wherein, the target time period is the time period from receiving the grayscale data of the new zone image to sending the grayscale data to the backlight driver. The power supply module is configured to adjust the power supply voltage of the LED backlight module to a target voltage according to the target current signal within the target time period, and the voltage in each channel of the adjusted LED backlight module is greater than a preset turn-on voltage.

[0032] Fifth aspect, the present application provides an electronic device, which includes a processor, and a computer program or instruction stored in the processor and the memory. The processor is configured to execute the computer program or instruction, so that the methods in the first aspect and the second aspect are executed.

[0033] Sixth aspect, the present application provides a computer-readable storage medium, on which a computer program (which can also be referred to as an instruction or code) for implementing the methods in the first aspect and the second aspect is stored. For example, when the computer program is executed by the computer, the computer can execute the methods in the first aspect and the second aspect.

[0034] Seventh aspect, the present application provides a chip, including a processor. The processor is configured to read and execute a computer program stored in the memory to execute the methods in the first aspect, the second aspect, and any possible implementation manners thereof. Optionally, the chip further includes a memory, and the memory is connected to the processor through a circuit or a wire.

[0035] Eighth aspect, the present application provides a chip system, including a processor. The processor is configured to read and execute a computer program stored in the memory to execute the methods in the first aspect, the second aspect, and any possible implementation manners thereof. Optionally, the chip system further includes a memory, and the memory is connected to the processor through a circuit or a wire.

[0036] In a ninth aspect, the present application provides a computer program product, which includes a computer program (also referred to as instructions or code). When the computer program is executed by an electronic device, the electronic device is enabled to implement the methods in the first aspect and the second aspect.

[0037] It can be understood that for the beneficial effects of the above-mentioned third aspect to the ninth aspect, reference can be made to the relevant descriptions in the above-mentioned first aspect and the second aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Hardware block diagram for power supply voltage regulation of the LED backlight module;

[0039] Figure 2 Flowchart of power supply voltage regulation provided by Solution 2 in the related art;

[0040] Figure 3 For V provided by Solution 2 in the related art LED Schematic diagram of the adjustment process;

[0041] Figure 4 Schematic flowchart of the method for power supply voltage regulation of the LED backlight module provided in Embodiment 1 of the present application;

[0042] Figure 5 Schematic flowchart of generating a preset mapping relationship between gray values and voltage coefficients provided in Embodiment 1 of the present application;

[0043] Figure 6 Another schematic flowchart of generating a preset mapping relationship between gray values and voltage coefficients provided in Embodiment 1 of the present application;

[0044] Figure 7 Schematic diagram of the mapping relationship between gray values and voltage coefficients provided in Embodiment 1 of the present application;

[0045] Figure 8A Schematic diagram of equally dividing all gray values within a preset gray range into step intervals provided in Embodiment 1 of the present application;

[0046] Figure 8B Schematic diagram of dividing a preset gray range into a low-order gray range and a high-order gray range provided in Embodiment 1 of the present application;

[0047] Figure 9 For V of the LED backlight module provided in Embodiment 1 of the present application LED Schematic diagram of the adjustment process;

[0048] Figure 10 During the image display process provided in Embodiment 1 of the present application, V LED Schematic diagram of changing with the backlight image;

[0049] Figure 11 Schematic diagram of the voltage adjustment moment provided in the first embodiment of the present application;

[0050] Figure 12 Flow schematic diagram of the power supply voltage adjustment method for the LED backlight module provided in the second embodiment of the present application;

[0051] Figure 13 Schematic diagram of the power supply voltage adjustment process for the LED backlight module provided in the second embodiment of the present application;

[0052] Figure 14 Schematic diagram of the structure of a power supply voltage adjustment system for an LED backlight module provided in the first embodiment of the present application. Detailed implementation manners

[0053] 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 clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0054] The term "and / or" in this article is an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The symbol " / " in this article represents an "or" relationship between associated objects. For example, A / B represents A or B.

[0055] The terms "first", "second", etc. in the description and claims of this application are used to distinguish different objects, rather than to describe a specific order of objects. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" refers to two or more. For example, a plurality of processing units refers to two or more processing units, and a plurality of elements refers to two or more elements.

[0056] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific manner.

[0057] To facilitate the understanding of the embodiments of the present application, some terms in the embodiments of the present application are explained below to facilitate the understanding of those skilled in the art.

[0058] Backlight module: It refers to a light source behind a liquid crystal display, and its lighting effect will directly affect the visual effect of the liquid crystal display module. The liquid crystal display itself does not emit light and must rely on the backlight to emit light. The main components of the backlight are: light source (lamp board), light guide plate, optical film layer, and structural parts. The specific composition of the backlight is not described in detail in this patent, and reference can be made to the existing technology for details.

[0059] V LED : The voltage used to supply power to the LED backlight module.

[0060] FBO: The feedback signal terminal (feedback output, FBO) is used to provide a current signal to the power supply module to control V LED 。

[0061] DC dimming: Direct current (DC), by increasing or decreasing the circuit power to change the brightness of the screen, that is, by changing the voltage or current to change the screen brightness.

[0062] See Figure 1 As shown, it is a hardware block diagram for adjusting the power supply voltage of the LED backlight module, including a backlight control circuit and an LED backlight module. The backlight control circuit controls the LED backlight module that supports zoned dimming (taking one light-emitting diode as an example in each channel) to achieve image display. The backlight control circuit includes a power supply module, a backlight control module, and an image source module. Both the power supply module and the image source module are connected to the backlight control module, and the backlight control module is connected to the LED backlight module. The LED backlight module includes multiple backlight driver chips and backlight driver channels. In the following text, the backlight driver channel is also referred to as the Driver channel, and the backlight driver chip is also referred to as the Driver chip.

[0063] The image source module is used to send a backlight image to the backlight control module.

[0064] The backlight control module has a feedback signal terminal FBO and at least one channel port. Among them, the data interface of the backlight control module is connected to the data interface of the Driver in the LED backlight module, and is used to send backlight control instructions and receive the signals fed back by the backlight module. For example, it receives the channel voltage status fed back by the Driver chip in the LED backlight module. Specifically, the Driver chip in the backlight module will compare the voltage at the channel (OUT) terminal with its corresponding threshold voltage, convert the comparison result into a current, and send the comparison result to the backlight control module in the form of a current. The backlight control module calls the voltage coefficient according to the comparison result, generates a current feedback signal, and sends the current feedback signal to the power supply module through FBO. The backlight control module is also used to receive the backlight image, send the backlight image data to the LED backlight module, and configure the Driver chip so that the LED backlight module displays the backlight image.

[0065] The power supply module is used to provide a power supply voltage for the LED backlight module, and adjust the power supply voltage of the LED backlight module according to the current feedback signal provided by the feedback signal terminal FBO of the backlight control module.

[0066] Currently, when the relevant power supply scheme provides a power supply voltage (referred to as V LED ) for the LED backlight module, it is impossible to minimize V LED to reduce power consumption while ensuring the display effect.

[0067] Solution 1: When the LED backlight module is powered on, the backlight control circuit provides a fixed V LED , and V LED remains unchanged throughout the process of the LED backlight module displaying an image.

[0068] Specifically, in the LED backlight module, since the current flowing through the LED is different when different pictures are displayed, the voltage drop of the LED is different. And due to the differences in lamp beads, wire resistance, power supply, etc., the voltage drop from the power supply terminal to each Driver channel is also different. The prerequisite for the Driver channel to work in the constant current region is that all Driver channels must meet a certain turning voltage. If V LED is too low, the voltage of some Driver channels is lower than the turning voltage, and the current does not meet the expectation, resulting in inconsistent brightness of each backlight partition of the LED backlight module. Therefore, the conventional method is to provide a higher V LED, when displaying an image, the voltage requirements for meeting the peak brightness are met, and the voltages in all Driver channels are higher than the turning voltage, which can ensure that the brightness of all backlight zones in the LED backlight module is consistent. However, during the display process, when displaying a low-gray image, the current of the LED is low. At this time, the voltage drops of the LED and the line resistance are low, and the voltage provided by the power supply is much higher than the turning voltage on the Driver channel. This will not only cause energy loss but also affect the lifespan of the device.

[0069] Solution 2: To prevent the V LED from being too high during the display process of the LED backlight module, resulting in excessive power consumption and serious heating of the driver chip, Solution 2 performs a V LED adjustment when the LED backlight module is powered on, and V LED remains unchanged throughout the process of the LED backlight module displaying an image.

[0070] Figure 2 The schematic diagram of the process for performing the V LED adjustment for Solution 2 is shown in Figure 2 . In the initial stage of power-on, the backlight control circuit provides a lower initial voltage for the LED backlight module. After the LED backlight module starts to display, the Driver chip collects the voltage of each Driver channel, compares it with the corresponding turning voltage, and feeds back the voltage status of each Driver channel to the backlight control module. If the voltage in a Driver channel is lower than the turning voltage, the backlight control module increases the FBO coefficient, provides a current feedback signal to the power supply module through the feedback signal terminal, and makes V LED rise; then the Driver chip performs channel voltage detection again and feeds it back to the backlight control module, and so on, until the voltages of all Driver channels are just greater than the turning voltage, the FBO coefficient is maintained, and V LED remains constant throughout the subsequent display process of the entire LED backlight module. The entire V LED adjustment process is as shown in Figure 3 . When V LED is the target voltage, the voltages of all Driver channels in the LED backlight module are just greater than the turning voltage.

[0071] However, since the V LED provided by the backlight control circuit for the LED backlight module is low in the initial stage of power-on, if V LED suddenly rises during the adjustment process, a flash screen phenomenon may occur. Secondly, to ensure that the adjusted V LED, it can meet the peak brightness requirement. Therefore, the gray value of the backlight image generated by the backlight control module for detection must be the maximum gray value. However, there is an abnormality when switching from the test screen to the normal display image after the debugging is completed. For example, when displaying a normal image, not all the gray values corresponding to the backlight partitions in the image data output by the image source module are the highest gray values, so there will be an abnormality when switching the image.

[0072] To better understand the embodiments of the present application, the embodiments of the present application will be briefly described as follows:

[0073] A method for regulating the supply voltage of an LED backlight module provided by the present application. When the LED backlight module displays a backlight image, if the frame output mode of the backlight image is the frame synchronization mode, the voltage coefficient can be determined according to the image data of the next frame of the backlight image, and the current signal can be called according to the voltage coefficient. Before the current frame of the backlight image is displayed and the next frame of the backlight image is displayed, the regulation of the supply voltage required for displaying the next frame of the backlight image is completed. If the frame output mode of the backlight image is the follow mode, the voltage coefficient can be determined according to at least one partition image and the new partition image in the currently displayed backlight image, and the current signal can be called according to the voltage coefficient to immediately regulate the supply voltage required for the LED backlight module to display the currently displayed backlight image and the new partition image. The follow mode means that after the backlight control module receives the single-partition data, it immediately sends it to the LED backlight module for display.

[0074] The following introduces a method and system for regulating the supply voltage of an LED backlight module provided by the present application in combination with specific embodiments.

[0075] Embodiment 1: Method for Regulating the Supply Voltage of an LED Backlight Module

[0076] See Figure 4 As shown, it is a schematic flow chart of the method for regulating the supply voltage of the LED backlight module provided by the embodiment of the present application. The method 100 includes the following steps S101-S104.

[0077] S101, obtain the next frame of the backlight image of the currently displayed backlight image.

[0078] Exemplarily, when the LED backlight module displays the backlight image of the fn frame, the backlight control module obtains the backlight image of the fn+1 frame. The backlight image of the fn+1 frame is the next frame of the backlight image of the fn frame.

[0079] S102, determine the target voltage coefficient according to the next frame of the backlight image.

[0080] In the embodiment of the present application, the LED backlight module includes N backlight partitions, and N is an integer greater than 1.

[0081] Exemplarily, before determining the target voltage coefficient according to the next-frame backlight image, the backlight control module receives the next-frame backlight image sent by the image source module, obtains a plurality of gray-scale data corresponding to the N backlight zones of the backlight module in the next-frame backlight image according to the N backlight zones corresponding to the LED backlight module, and determines the corresponding target voltage coefficient according to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data.

[0082] In the embodiment of the present application, the corresponding target voltage coefficient is determined according to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data. Specifically, according to the preset mapping relationship between the gray-scale value and the voltage coefficient, the target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value is determined.

[0083] Among them, the partition current corresponding to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data corresponding to the N backlight zones of the backlight module is also the largest. Selecting the gray-scale data with the largest value to determine the corresponding voltage coefficient can ensure the normal display of the highlighted part in the next-frame backlight image.

[0084] In the embodiment of the present application, before determining the target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to the preset mapping relationship between the gray-scale value and the voltage coefficient, the gray-scale values of M test images within the preset gray-scale range and the voltage coefficient corresponding to each gray-scale value are obtained, and the preset mapping relationship between the gray-scale value and the voltage coefficient is generated.

[0085] The generation process of the preset mapping relationship is as follows:

[0086] (1) The backlight control module obtains M test images within the preset gray-scale range.

[0087] Each test image corresponds to a gray-scale value. Among them, the preset gray-scale range is [0, 2 K -1], where K is the bit depth of the image displayed by the LED backlight module, and each gray-scale value within the preset gray-scale range corresponds to a voltage coefficient. For example, when K is 8, the preset gray-scale range is [0, 255].

[0088] Among them, the preset gray-scale range refers to the minimum gray-scale value to the maximum gray-scale value under a quantization unit. Quantization means that the computer software obtains the data of a sample point (picture), and then it needs to use how many binary bits to represent it. For example, when K is 8, it is the same as the computer using 8-bit quantization. In addition to 8-bit quantization, the computer generally also uses 16-bit and 32-bit quantization, etc. In the following embodiments, 8-bit quantization is used as an example for illustration.

[0089] (2) When the LED backlight module displays the M test images frame by frame, the voltage coefficient corresponding to each gray-scale value is obtained.

[0090] Exemplarily, the LED backlight module receives 256 test images sent by the backlight control module and displays 256 test images frame by frame. By adjusting the voltage coefficient, the supply voltage of the LED backlight module is adjusted frame by frame to obtain the voltage coefficient corresponding to each gray value.

[0091] Among them, displaying 256 test images frame by frame can be to display M test images frame by frame in ascending order of image gray value, or to display M test images frame by frame in descending order of image gray value. Hereinafter, an example of displaying M test images frame by frame in ascending order of image gray value will be used for exemplary illustration.

[0092] ① Exemplarily, refer to Figure 5 As shown, when the LED backlight module initially displays a test image with a gray value of 0 and displays M test images frame by frame in ascending order of image gray value, the supply voltage of the LED backlight module is gradually increased by increasing the voltage coefficient. The specific process is as follows:

[0093] The Driver chip in the LED backlight module detects the voltage in each channel of the current LED backlight module and sends the voltage status in each channel to the backlight control module. Due to differences in lamp beads, wires, power supplies, etc., the turning voltages in each channel are different. If the voltage in a channel is less than the turning voltage, the backlight control module increases the voltage coefficient and generates an FBO current corresponding to the adjusted voltage coefficient, denoted as IFBO in the figure, so that the power supply module raises V LED , the test image continues to be displayed, and the backlight control module judges again. If the voltages in all channels are greater than the turning voltage, the voltage coefficient is saved, and it is judged whether the gray value of the current test image is 255; if not, the LED backlight module starts to display the next frame of test image, and so on until all gray values within the preset gray range are traversed; if so, the loop ends, and the voltage coefficient corresponding to each gray value is saved.

[0094] Exemplarily, hereinafter, an example of displaying M test images frame by frame in descending order of image gray value will be used for exemplary illustration.

[0095] ② Refer to Figure 6 As shown, when the LED backlight module initially displays a test image with a gray value of 255 and displays M test images frame by frame in descending order of image gray value, the supply voltage of the LED backlight module is gradually decreased by decreasing the voltage coefficient. The specific process is as follows:

[0096] The Driver chip in the LED backlight module detects the voltage in each channel of the current LED backlight module and sends the voltage status in each channel to the backlight control module. The backlight control module determines whether the voltages in all channels are within the preset range of the transition voltage. If there is a channel voltage greater than the upper threshold of the preset transition voltage, the backlight control module reduces the voltage coefficient and generates an FBO current corresponding to the adjusted voltage coefficient, denoted as IFBO in the figure, so that the power supply module reduces V LED , the test image continues to be displayed, and the backlight control module judges again. If the voltages in all channels are less than the upper threshold of the preset transition voltage and greater than the lower threshold of the transition voltage, the voltage coefficient is saved, and it is judged whether the gray value of the current test image is 0; if not, the LED backlight module starts to display the next frame of test image, and so on until all gray values within the preset gray range are traversed; if so, the loop ends and the voltage coefficient corresponding to each gray value is saved.

[0097] Exemplarily, the manifestation form of the preset mapping relationship between the gray value and the voltage coefficient can be a preset voltage coefficient look-up table. Among them, the preset voltage coefficient look-up table includes a one-to-one mapping relationship between the gray value and the voltage coefficient; it should be noted that the preset voltage coefficient look-up table is only one manifestation form of the preset mapping, and it does not limit the form of the preset mapping relationship.

[0098] See Figure 7 As shown, the backlight control module records the mapping relationship between the gray value and the voltage coefficient of each frame of test image and generates a preset voltage coefficient look-up table according to the mapping relationship.

[0099] In some other embodiments of the present application, the backlight control module receives a calibration instruction, generates a mapping relationship between each gray value within the preset gray range and the voltage coefficient corresponding to the gray value according to the calibration instruction, and updates the preset voltage coefficient look-up table with the newly generated mapping relationship.

[0100] Exemplarily, the generation process of the new mapping relationship is as follows:

[0101] After receiving the calibration instruction sent by the image source module, the backlight control module generates 256 frames of test images within the preset gray range according to the calibration instruction, and each test image corresponds to a gray value. When the LED backlight module displays 256 frames of test images frame by frame, the backlight control module adjusts the voltage supplied to the LED backlight module frame by frame by adjusting the voltage coefficient, so that the voltages in all channels of the LED backlight module after adjustment are greater than the preset transition voltage, and the voltage coefficient at this time is saved. The backlight control module records the new mapping relationship between the gray value and the voltage coefficient of each frame of test image and updates the preset voltage coefficient look-up table according to the new mapping relationship.

[0102] In this embodiment, by periodically sending calibration instructions through the image source module, it is possible to periodically update the preset voltage coefficient lookup table, so that the supply voltage can be adjusted more accurately.

[0103] In other embodiments of the present application, when obtaining the voltage coefficient corresponding to each grayscale value, all grayscale values ​​within a preset grayscale range may be divided into step intervals at equal intervals, and a grayscale value within a step interval corresponds to a voltage coefficient.

[0104] For example, when the grayscale difference between the first and second frames is small, the voltage difference between the two frames can be ignored. When the grayscale values ​​of the first and second frames correspond to a voltage coefficient, the supply voltage required to display the next frame of the backlight image can be adjusted quickly without calling a new current signal. Figure 8A As shown, all grayscale values ​​within the preset grayscale range are divided into multiple intervals with a step length of 5, and every 5 grayscale values ​​correspond to a voltage coefficient.

[0105] In some other embodiments of the present application, the preset grayscale range includes multiple grayscale ranges; in the first grayscale range, S consecutive grayscale values ​​correspond to a voltage coefficient. In the second grayscale range, T consecutive grayscale values ​​correspond to a voltage coefficient. The first grayscale range and the second grayscale range are two grayscale ranges in the preset grayscale range; the grayscale value in the first grayscale range is less than the grayscale value in the second grayscale range, S is less than T, and both S and T are integers greater than 1.

[0106] For example, see Figure 8B As shown, the preset grayscale range includes a low-order grayscale range and a high-order grayscale range, and the grayscale values ​​0-127 within the preset grayscale range (0-255) are used as the low-order grayscale range, and in the low-order grayscale range, three consecutive grayscale values ​​correspond to one voltage coefficient. The grayscale values ​​128-255 within the preset grayscale range (0-255) are used as the high-order grayscale range, and in the high-order grayscale range, 10 consecutive grayscale values ​​correspond to one voltage coefficient.

[0107] In actual application scenarios, multiple grayscale ranges included in the preset grayscale range and the number of grayscale values ​​corresponding to the same voltage coefficient in multiple grayscale ranges can be set according to actual conditions. When adjusting the power supply voltage, the current signal is quickly determined to make the power supply voltage adjustment more efficient. In addition, high grayscale levels and low grayscale levels correspond to different voltage adjustments, making the adjustment more precise and the picture display more delicate.

[0108] S103, determining a target current signal based on the target voltage coefficient.

[0109] Exemplarily, there is a preset corresponding relationship between the voltage coefficient (FBO_Code) and the feedback current signal (IFBO), as shown in the following table:

[0110] Table 1

[0111] FBO_Code IFBO 0x45 34.5 μA 0x46 35 μA 0x47 35.5 μA

[0112] Exemplarily, after determining the target voltage coefficient corresponding to the grayscale data with the maximum grayscale value according to the preset mapping relationship between the grayscale value and the voltage coefficient, a target current signal is determined based on the target voltage coefficient and the preset corresponding relationship between the voltage coefficient and the current signal.

[0113] S104. Adjust the supply voltage of the LED backlight module to the target voltage according to the target current signal within the target time period.

[0114] Wherein, the voltage in each channel of the adjusted LED backlight module is greater than the preset turning voltage. The target time period is the time period after the current displayed backlight image is displayed and before the next frame of backlight image is displayed.

[0115] Exemplarily, in the embodiment of the present application, according to the maximum grayscale value of the backlight image, the voltage coefficient is called, and the voltage supplied to the LED backlight module is adjusted according to the voltage coefficient. The specific implementation process is as Figure 9 shown.

[0116] Exemplarily, during the display of the LED backlight image, the schematic diagram of V LED changing with the change of the backlight image can be seen in Figure 10 shown. According to the data of the backlight image, the voltage coefficient corresponding to the maximum grayscale value of the next frame of backlight image is searched in the preset mapping relationship, and finally V LED is adjusted during frame switching, so that fast adjustment of V LED can be realized at any image grayscale. Even when the difference in the desired supply voltage between the previous and the next frames of images is large, it can be adjusted in place at one time. In the figure, Code_max is the maximum grayscale value of a frame of image. For example, Code_max = 128 is the maximum grayscale value of the backlight image of the fn-1 frame.

[0117] The following is an example to illustrate the application process of the method for adjusting the supply voltage of the LED backlight module provided in Embodiment 1 in an actual scenario.

[0118] Exemplarily, taking the frame synchronization mode of four partitions (the backlight control module sends all partition data to the LED backlight module for display) as an example. During the process of switching the backlight image displayed by the LED backlight module from the backlight image of the fn-1 frame to the backlight image of the fn frame, the process of adjusting the supply voltage of the LED backlight module includes the following steps:

[0119] (1) When the LED backlight module is displaying the backlight image of the fn-1 frame, the backlight control module receives the data of the backlight image of the fn frame.

[0120] (2) Find the voltage coefficient corresponding to the gray data with the largest gray value among the multiple gray data corresponding to the four partitions of the received fn-frame backlight image in the preset mapping relationship.

[0121] (3) Determine the current signal according to the voltage coefficient corresponding to the gray data with the largest gray value.

[0122] (4) Before the display of the fn-frame backlight image is completed and before the display of the fn-frame backlight image, adjust the V required for displaying the fn-frame backlight image according to the current signal. LED 。

[0123] For the power supply voltage adjustment process of the LED backlight module, see Figure 11 As shown, while not affecting the display of the fn-1 frame backlight image, before the display of the fn-frame backlight image, complete the adjustment of the V required for displaying the fn-frame backlight image. LED Similarly, when displaying the fn-frame backlight image, continue to obtain the backlight image of the fn+1 frame. While not affecting the display of the fn-frame backlight image, before the display of the fn+1 frame backlight image, complete the adjustment of the V required for displaying the fn+1 frame backlight image. LED And so on, complete the adjustment of the power supply voltage of the LED backlight module during the display process.

[0124] Through the power supply voltage adjustment method of the LED backlight module provided in the first embodiment of the present application, when displaying the current frame backlight image, receive the data of the next frame backlight image, determine the voltage coefficient according to the image data of the next frame backlight image, and adjust the power supply voltage of the LED backlight module according to the voltage coefficient. It is possible to complete the adjustment of the V required for displaying the next frame backlight image before the display of the next frame backlight image without affecting the display of the current frame backlight image. LED That is, complete the adjustment of the V required for the next frame backlight image during the black field time between frames. LED There is no delay in the adjustment process, and the power consumption of the entire backlight partition system can be reduced on the premise of normal display of the LED backlight module.

[0125] Embodiment 2: Power supply voltage adjustment method of LED backlight module

[0126] See Figure 12 As shown, it is a schematic flowchart of the power supply voltage adjustment method of the LED backlight module provided in the embodiment of the present application. This method 200 includes the following steps S201-S205.

[0127] S201, Obtain at least one partition image in the backlight images currently displayed by N backlight partitions of the LED backlight module.

[0128] In an embodiment of the present application, the LED backlight module includes N backlight zones, where N is an integer greater than 1. When the LED backlight module displays a backlight image, the zones receive image data and display it.

[0129] Exemplarily, if the N backlight zones of the LED backlight module are currently displaying a backlight image of frame fn-1, the backlight control module acquires at least one zone image of the backlight image of frame fn-1.

[0130] Specifically, since the N zone images in the LED backlight module display different images and have different brightnesses in some application scenarios. For example, if some zones are black, the voltage requirement for such zones is very low. Therefore, in such a case, the backlight control module can acquire the zone images of other zones in the currently displayed backlight image except for the black zones; of course, those skilled in the art can understand that the backlight control module can also acquire the zone images of all zones in such a scenario; and when in some application scenarios, the N zone images in the LED backlight module are substantially the same and the brightness difference is small, the voltage requirements for each zone are not much different. In such a case, the backlight control module can acquire the zone images of all zones in the currently displayed backlight image.

[0131] S202, receive a new zone image.

[0132] Wherein, the new zone image is a zone image data in the currently displayed backlight image, or the new zone image is a zone image data in the next-frame backlight image of the currently displayed backlight image.

[0133] Exemplarily, the new zone image can be a zone image data in the backlight image of frame fn-1, or the new zone image can also be a zone image data in the backlight image of frame fn. The backlight image of frame fn is the next-frame backlight image of the backlight image of frame fn-1.

[0134] S203, determine a target voltage coefficient according to at least one zone image in the currently displayed backlight image and the new zone image.

[0135] Exemplarily, before determining the target voltage coefficient according to at least one zone image in the currently displayed backlight image and the new zone image, the backlight control module acquires the gray data with the largest gray value among the gray data of at least one zone image in the currently displayed backlight image and the gray data of the new zone image. Determine the target voltage coefficient according to the gray data with the largest gray value.

[0136] In an embodiment of the present application, the method for determining the target voltage coefficient according to the gray data with the largest gray value is specifically: determine the target voltage coefficient corresponding to the gray data with the largest gray value according to the preset mapping relationship between the gray value and the voltage coefficient.

[0137] Exemplarily, among the grayscale data of at least one partition image in the currently displayed backlight image and the grayscale data of the new partition image, the partition current corresponding to the grayscale data with the largest grayscale value is also the largest. Selecting the grayscale data with the largest grayscale value to determine the corresponding voltage coefficient can ensure the normal display of the highlighted parts in each partition of the backlight image.

[0138] In the embodiment of the present application, before determining the target voltage coefficient corresponding to the grayscale data with the largest grayscale value according to the preset mapping relationship between the grayscale value and the voltage coefficient, the preset mapping relationship between the grayscale value and the voltage coefficient can be generated by obtaining the grayscale values of M test images within a preset grayscale range and the voltage coefficient corresponding to each grayscale value.

[0139] In the embodiment of the present application, the generation process of the preset mapping relationship can be referred to as described in Embodiment 1.

[0140] In some other embodiments of the present application, the backlight control module receives a calibration instruction, generates a mapping relationship between each grayscale value within a preset grayscale range and the voltage coefficient corresponding to the grayscale value according to the calibration instruction, and updates the preset voltage coefficient lookup table with the newly generated mapping relationship.

[0141] Exemplarily, the generation process of the new mapping relationship can be referred to as described in Embodiment 1.

[0142] In this embodiment, by periodically sending a calibration instruction through the image source module, the preset voltage coefficient lookup table can be updated regularly, making the adjustment of the supply voltage more accurate.

[0143] In some other embodiments of the present application, all grayscale values within a preset grayscale range are equally spaced into step intervals, and the grayscale values within one step interval correspond to one voltage coefficient.

[0144] For example, when the grayscale difference between the previous and the next frame of the picture is small, the voltage difference required for the two frames of the picture can be ignored. In the case where the grayscale values of the previous and the next frame of the picture correspond to one voltage coefficient, at this time, there is no need to call a new current signal, and the adjustment of the supply voltage required for displaying the next frame of the backlight image can be quickly completed. Exemplarily, all grayscale values within a preset grayscale range are each divided into multiple intervals with a step size of 5, and every 5 grayscale values correspond to one voltage coefficient.

[0145] In some other embodiments of the present application, the preset grayscale range includes multiple grayscale ranges; in the first grayscale range, S consecutive grayscale values ​​correspond to a voltage coefficient. In the second grayscale range, T consecutive grayscale values ​​correspond to a voltage coefficient. The first grayscale range and the second grayscale range are two grayscale ranges in the preset grayscale range; the grayscale value in the first grayscale range is less than the grayscale value in the second grayscale range, S is less than T, and both S and T are integers greater than 1.

[0146] Exemplarily, the preset grayscale range includes a low-order grayscale range and a high-order grayscale range, and the grayscale values ​​0-127 within the preset grayscale range (0-255) are used as the low-order grayscale range, and within the low-order grayscale range, three consecutive grayscale values ​​correspond to one voltage coefficient. The grayscale values ​​128-255 within the preset grayscale range (0-255) are used as the high-order grayscale range, and within the high-order grayscale range, ten consecutive grayscale values ​​correspond to one voltage coefficient.

[0147] In actual application scenarios, multiple grayscale ranges included in the preset grayscale range and the number of grayscale values ​​corresponding to the same voltage coefficient in multiple grayscale ranges can be set according to actual conditions. When adjusting the power supply voltage, the current signal is quickly determined to make the power supply voltage adjustment more efficient. In addition, high grayscale levels and low grayscale levels correspond to different voltage adjustments, making the adjustment more precise and the picture display more delicate.

[0148] S204, determining a target current signal based on the target voltage coefficient.

[0149] Exemplarily, there is a preset corresponding relationship between the voltage coefficient (FBO_Code) and the feedback current signal (IFBO), as shown in the following table:

[0150] Table 2

[0151] FBO_Code IFBO 0x45 34.5 μA 0x46 35 μA 0x47 35.5 μA

[0152] Exemplarily, after determining the target voltage coefficient corresponding to the grayscale data with the maximum grayscale value according to the preset mapping relationship between the grayscale value and the voltage coefficient, the target current signal is determined based on the target voltage coefficient and the preset corresponding relationship between the voltage coefficient and the current signal.

[0153] S205 , adjusting the power supply voltage of the LED backlight module to a target voltage according to the target current signal within a target time period.

[0154] The voltage in each channel of the LED backlight module after adjustment is greater than the preset breakover voltage. The target time period is the time period from receiving the grayscale data of the new subarea image to sending the grayscale data to the backlight driver.

[0155] Exemplarily, an embodiment of the present application calls a voltage coefficient according to the maximum gray value of a backlight image, and adjusts the voltage supplied to the LED backlight module according to the voltage coefficient. The specific implementation process is as follows Figure 9 shown.

[0156] The following is an example to illustrate the application process of the power supply voltage adjustment method for the LED backlight module provided in the second embodiment in an actual scenario.

[0157] Exemplarily, taking the follow-up mode of 4 partitions (the backlight control module immediately sends the single-partition data to the LED backlight module for display) as an example. In the process of switching the backlight image displayed by the LED backlight module from the backlight image of the fn-1 frame to the backlight image of the fn frame, the power supply voltage adjustment process of the LED backlight module includes the following steps:

[0158] (1) Exemplarily, the backlight image currently displayed by the LED backlight module is the image of the fn-1 frame. Refer to Figure 13 (a) shown. The LED backlight module includes 4 partitions. From left to right and from top to bottom, they are the first partition, the second partition, the third partition, and the fourth partition. The backlight control module receives the data of 4 partitions in sequence. After receiving the data of one partition, it will immediately update and display it on the module.

[0159] Exemplarily, at this time, the new partition image is the image data of the first partition in the backlight image of the fn frame. After receiving the image of the first partition in the backlight image of the fn frame, as Figure 13 (b) shown, the data of the first partition is fn frame, and the data of the remaining partitions is the value of the fn-1 frame. At this time, the control module will count the gray value with the largest gray value among its 4 partitions, find the corresponding voltage coefficient in the preset mapping relationship according to the gray data with the largest gray value, determine the current signal according to the voltage coefficient, and before sending the image gray data of the first partition in the backlight image of the fn frame to the backlight driver, adjust V LED to the value required for the backlight image shown in Figure 13 (b).

[0160] Exemplarily, after sending the image gray data of the first partition in the backlight image of the fn frame to the backlight driver, at this time, in the backlight image displayed by the LED backlight module, as Figure 13 (b) shown, the first partition is the backlight image of the fn frame, and the second partition, the third partition, and the fourth partition are the backlight images of the fn-1 frame.

[0161] (2) The backlight control module continuously obtains the image data of at least one partition in the current backlight images of the 4 backlight partitions of the LED backlight module, and continues to receive new partition images.

[0162] Exemplarily, at this time, the new partition image is the image data of the second partition in the backlight image of the fn-th frame. After receiving the image of the second partition in the backlight image of the fn-th frame, as Figure 13 shown in (c) of LED , the data of the first and second partitions is the data of the fn-th frame, and the data of the remaining partitions is the value of the (fn - 1)-th frame. At this time, the control module will count the value with the largest gray level among its four partitions, find the corresponding voltage coefficient in the preset mapping relationship according to the gray level data with the largest gray level, determine the current signal according to the voltage coefficient, and before sending the image gray level data of the second partition in the backlight image of the fn-th frame to the backlight driver, adjust V Figure 13 to the value required for the backlight image shown in (c) of

[0163] Exemplarily, after sending the image gray level data of the second partition in the backlight image of the fn-th frame to the backlight driver, at this time, in the backlight image displayed by the LED backlight module, as Figure 13 shown in (c) of

[0164] (3) The backlight control module continuously acquires the image data of at least one partition in the currently displayed backlight images of the four backlight partitions of the LED backlight module and continues to receive new partition images.

[0165] Exemplarily, at this time, the new partition image is the image data of the third partition in the backlight image of the fn-th frame. After receiving the image of the third partition in the backlight image of the fn-th frame, as Figure 13 shown in (d) of LED , the data of the first, second, and third partitions is the data of the fn-th frame, and the fourth is the value of the (fn - 1)-th frame. At this time, the control module will count the value with the largest gray level among its four partitions, find the corresponding voltage coefficient in the preset mapping relationship according to the gray level data with the largest gray level, determine the current signal according to the voltage coefficient, and before sending the image gray level data of the third partition in the backlight image of the fn-th frame to the backlight driver, adjust V Figure 13 to the value required for the backlight image shown in (d) of

[0166] Exemplarily, after sending the image gray level data of the third partition in the backlight image of the fn-th frame to the backlight driver, at this time, in the backlight image displayed by the LED backlight module, as Figure 13 shown in (d) of

[0167] (4) The backlight control module continuously obtains the image data of at least one partition in the currently displayed backlight images of the 4 backlight partitions of the LED backlight module, and continues to receive new partition images.

[0168] Exemplarily, at this time, the new partition image is the image data of the ④th partition in the backlight image of the fn frame. After receiving the image of the ④th partition in the backlight image of the fn frame, as Figure 13 shown in (e), the values of the 4 partitions are for the fn frame. At this time, the control module will calculate the maximum grayscale value among its 4 partitions, find the corresponding voltage coefficient in the preset mapping relationship according to the grayscale data with the largest grayscale value, determine the current signal according to the voltage coefficient, and before sending the image grayscale data of the ④th partition in the backlight image of the fn frame to the backlight driver, adjust V LED to the value required for the backlight image shown in Figure 13 (e).

[0169] Exemplarily, after sending the image grayscale data of the ④th partition in the backlight image of the fn frame to the backlight driver, at this time, in the backlight image displayed by the LED backlight module, as Figure 13 shown in (e), the ①st partition, the ②nd partition, the ③rd partition, and the ④th partition are all the backlight images of the fn frame.

[0170] Through the power supply voltage adjustment method of the LED backlight module provided in the second embodiment of the present application, when the LED backlight module displays the current frame of the backlight image, the voltage coefficient can be determined according to at least one partition image and the new partition image in the currently displayed backlight image. According to the voltage coefficient, the power supply voltage required for the LED backlight module to display the currently displayed backlight image and the new partition image can be immediately adjusted, achieving the effect of reducing the power consumption of the entire backlight partition system on the premise of normal display of the LED backlight module.

[0171] The difference between the power supply voltage adjustment methods of the LED backlight module provided in the first embodiment and the second embodiment of the present application is that: in the first embodiment, after receiving the image data of all partitions of the backlight image, the current signal is called to perform V LED adjustment. In the second embodiment, after receiving the single partition image of the backlight image, the current signal is immediately called to perform V LED adjustment.

[0172] Embodiment 3: Power supply voltage adjustment system

[0173] Based on the power supply voltage adjustment method of the LED backlight module provided in the first embodiment above, the present application embodiment provides a power supply voltage adjustment system for the LED backlight module. Refer to Figure 14As shown, the adjustment system 01 includes a power supply module 10, a backlight control module 20, and an image source module 30. The backlight control module 20 is respectively connected to the power supply module 10 and the image source module 30. The LED backlight module (for specific illustration, reference can be made to Figure 1 ) includes N backlight zones, where N is an integer greater than 1.

[0174] In the embodiment of the present application, the image source module 30 is used to send the next frame of backlight image of the currently displayed backlight image to the backlight control module 20.

[0175] In the embodiment of the present application, the backlight control module 20 has a feedback signal terminal FBO and at least one channel port. The data interface CH1 is used to receive the next frame of backlight image, determine the target voltage coefficient according to the next frame of backlight image, and determine the target current signal based on the target voltage coefficient. It is also used to send the target current signal to the power supply module 10 within the target time period.

[0176] Wherein, the target time period is the time period before the currently displayed backlight image is displayed completely and the next frame of backlight image is displayed.

[0177] Exemplarily, the backlight control module 20 further includes a data interface CH2, which is used to receive the channel voltage status feedback by the Driver chip in the LED backlight module. The backlight control module 20 calls the voltage coefficient according to the feedback channel voltage status to generate a current feedback signal.

[0178] The power supply module is coupled to the feedback signal terminal FBO of the backlight control module. Therefore, after converting the input voltage, the power supply module is also used to fine-tune the converted voltage according to the current feedback signal provided by the feedback signal terminal FBO of the backlight control module to obtain the above-mentioned power supply voltage V LED , and outputs it through the voltage output terminal. Thus, the purpose of adjusting the voltage in the Driver channel of the LED backlight module is achieved.

[0179] In the embodiment of the present application, the power supply module 10 is used to adjust the power supply voltage of the LED backlight module to the target voltage according to the target current signal within the target time period; the voltages in each channel of the adjusted LED backlight module are all greater than the preset turning voltage.

[0180] Exemplarily, as Figure 14 shown, the data port CH3 of the backlight control module 20 is coupled to the LED backlight module. The backlight control module 20 is also used to send image data to the LED backlight module through the channel port CH3 to configure the Driver chip, so that the LED backlight module displays the backlight image.

[0181] In the embodiment of the present application, the LED backlight module is used to display the backlight image through N backlight zones.

[0182] It should be noted that for the detailed working principles of the modules in the power supply voltage regulation system of the LED backlight module provided in this embodiment, reference can be made to the relevant descriptions in the foregoing Embodiment 1, and details will not be elaborated herein.

[0183] Through the power supply voltage regulation system provided by this application, when the LED backlight module displays a backlight image, according to the maximum gray value of the backlight image, a voltage coefficient is determined, and the voltage supplied to the LED backlight module is adjusted according to the voltage coefficient, so that the LED backlight module can display normally, and at the same time, the power consumption of the LED backlight module is reduced.

[0184] Embodiment 4: Power Supply Voltage Regulation System

[0185] Based on the power supply voltage regulation method of the LED backlight module provided in the foregoing Embodiment 2, this embodiment of the application provides a power supply voltage regulation system for an LED backlight module. For the constituent modules of the system provided in Embodiment 4 and the descriptions of the modules, reference can be made to those described in Embodiment 3.

[0186] In this embodiment of the application, an image source module 30 is configured to send a new partition image to a backlight control module. The new partition image is a partition image data in the currently displayed backlight image, or the new partition image is a partition image data in the next frame of the backlight image of the currently displayed backlight image.

[0187] In this embodiment of the application, a backlight control module 20 has at least one channel port at a feedback signal end FBO. A data port CH1 is configured to receive the new partition image, determine a target voltage coefficient according to at least one partition image in the currently displayed backlight image and the new partition image, and determine a target current signal based on the target voltage coefficient. It is also configured to send the target current signal to a power supply module 10 within a target time period.

[0188] Wherein, the target time period is the time period from receiving the gray data of the new partition image to sending the gray data to the backlight drive.

[0189] In this embodiment of the application, a power supply module 10 is configured to adjust the power supply voltage of the LED backlight module to a target voltage according to the target current signal within the target time period, and the voltages in each channel of the adjusted LED backlight module are all greater than a preset turning voltage.

[0190] Exemplarily, as Figure 14 shown, a channel port CH3 of the backlight control module 20 is coupled to the LED backlight module. The backlight control module 20 is further configured to send image data to the LED backlight module through the data port CH3, configure a Driver chip, and enable the LED backlight module to display a backlight image.

[0191] It should be noted that the system frameworks of the fourth embodiment and the third embodiment are the same, the difference lies in the different methods executed, and the detailed working principles of each module in the power supply voltage regulation system of the LED backlight module provided in the fourth embodiment can refer to the relevant descriptions of the second embodiment above, which will not be elaborated here.

[0192] The above mainly describes the solutions provided in the embodiments of the present application from the perspective of method steps. It can be understood that in order to implement the above functions, the electronic device implementing this method includes the corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should be able to realize that, combining the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the protection scope of the present application.

[0193] The embodiments of the present application can divide the electronic device into functional modules according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there can be other feasible division methods in actual implementation.

[0194] It also should be noted that in the embodiments of the present application, "greater than" can be replaced by "greater than or equal to", "less than or equal to" can be replaced by "less than", or, "greater than or equal to" can be replaced by "greater than", "less than" can be replaced by "less than or equal to".

[0195] The embodiments of the present application also provide a chip, which is coupled to a memory, and the chip is used to read and execute the computer program or instructions stored in the memory to execute the methods in the above embodiments.

[0196] The embodiments of the present application also provide an electronic device, which includes a chip, and the chip is used to read and execute the computer program or instructions stored in the memory, so that the methods in the embodiments are executed.

[0197] The embodiments of the present application also provide a computer-readable storage medium, in which computer instructions are stored. When the computer instructions run on an electronic device, the electronic device is enabled to execute the above relevant method steps to implement a power supply voltage regulation method of a backlight control circuit in the above embodiments.

[0198] An embodiment of the present application also provides a computer program product. The computer-readable storage medium stores program codes. When the computer program product runs on a computer, the computer is enabled to execute the above-related steps to implement a method for regulating the supply voltage of a backlight control circuit in the above embodiment.

[0199] In addition, an embodiment of the present application also provides a device, which may specifically be a chip, a component or a module. The device may include a processor and a memory connected to each other. The memory is used to store computer execution instructions. When the device runs, the processor may execute the computer execution instructions stored in the memory to enable the chip to execute a method for regulating the supply voltage of a backlight control circuit in each of the above method embodiments.

[0200] Among them, the electronic device, computer-readable storage medium, computer program product or chip provided in the embodiments of the present application are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be elaborated here.

[0201] In several embodiments provided by the present application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0202] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope defined by the claims.

Claims

1. A method for adjusting the supply voltage of an LED backlight module, characterized in that, The method includes: Obtaining the next-frame backlight image of the currently displayed backlight image; Determining a target voltage coefficient according to the next-frame backlight image, and determining a target current signal based on the target voltage coefficient; Adjusting the supply voltage of the LED backlight module to a target voltage according to the target current signal within a target time period, and the voltages in each channel of the adjusted LED backlight module are all greater than a preset turning voltage; wherein, the target time period is the time period after the currently displayed backlight image is displayed and before the next-frame backlight image is displayed.

2. The method according to claim 1, characterized in that, The LED backlight module includes N backlight partitions, N is an integer greater than 1, and determining the target voltage coefficient according to the next-frame backlight image includes: Obtaining a plurality of gray-scale data corresponding to the N backlight partitions of the backlight module in the next-frame backlight image; Determining a corresponding target voltage coefficient according to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data.

3. The method according to claim 2, characterized in that, The determining a corresponding target voltage coefficient according to the gray-scale data with the largest gray-scale value among the plurality of gray-scale data includes: Determining a target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to a preset mapping relationship between the gray-scale value and the voltage coefficient.

4. The method according to claim 3, characterized in that, Before determining a target voltage coefficient corresponding to the gray-scale data with the largest gray-scale value according to the preset mapping relationship between the gray-scale value and the voltage coefficient, the method further includes: Obtaining M test images within a preset gray-scale range, and each test image corresponds to a gray-scale value; When the LED backlight module displays the M test images frame by frame, obtaining the voltage coefficient corresponding to each gray-scale value; wherein, the mapping relationship between each gray-scale value and the voltage coefficient corresponding to the gray-scale value is the preset mapping relationship.

5. The method according to claim 4, wherein The obtaining the voltage coefficient corresponding to each gray-scale value when the LED backlight module displays the M test images frame by frame includes: When the LED backlight module displays the M test images frame by frame, adjusting the supply voltage of the LED backlight module frame by frame by adjusting the voltage coefficient; When the voltages in each channel of the N backlight partitions of the adjusted LED backlight module are all greater than the preset turning voltage, saving the voltage coefficient; Obtaining the preset mapping relationship according to the gray-scale value of each test image and the voltage coefficient corresponding to the gray-scale value.

6. The method according to claim 4, wherein The method further includes: Receiving a calibration instruction, generating a mapping relationship between each gray-scale value within the preset gray-scale range and the voltage coefficient corresponding to the gray-scale value according to the calibration instruction, and updating the preset mapping relationship with the newly generated mapping relationship.

7. The method according to claim 5, wherein The LED backlight module displays the M test images frame by frame, including: the LED backlight module displays the M test images frame by frame in ascending order of the image gray-scale value; The adjusting the supply voltage of the LED backlight module frame by frame by adjusting the voltage coefficient includes: Gradually increasing the supply voltage of the LED backlight module frame by frame by increasing the voltage coefficient; When the voltages in each channel of the LED backlight module after adjustment are not all greater than the preset turning voltage, continue to adjust the supply voltage of the LED backlight module by increasing the voltage coefficient; When the voltages in each channel of the LED backlight module after adjustment are all greater than the preset turning voltage, save the voltage coefficient.

8. The method according to any one of claims 4 to 7, characterized in that The preset gray scale range is [0, 2 K -1], where K is the bit depth of the image displayed by the LED backlight module, and each gray scale value within the preset gray scale range corresponds to a voltage coefficient.

9. The method according to any one of claims 4 to 7, characterized in that The obtaining the voltage coefficient corresponding to each gray value includes: Equally spacedly dividing the step interval for all gray values within the preset gray range, and the gray values within one step interval correspond to one voltage coefficient.

10. The method according to any one of claims 4 to 7, characterized in that The preset gray range includes multiple gray ranges; Within the first gray range, consecutive S gray values correspond to one voltage coefficient; Within the second gray range, consecutive T gray values correspond to one voltage coefficient; Wherein, the first gray range and the second gray range are two gray ranges in the preset gray range; the gray values within the first gray range are less than the gray values within the second gray range, S is less than T, and both S and T are integers greater than 1.

11. A method for adjusting the supply voltage of an LED backlight module, characterized in that, The method includes: Obtaining at least one partition image in the backlight image currently displayed by N backlight partitions of the LED backlight module; Receiving a new partition image; wherein, the new partition image is the data of a partition image in the currently displayed backlight image, or the new partition image is the data of a partition image in the next frame of the backlight image of the currently displayed backlight image; Determining a target voltage coefficient according to at least one partition image in the currently displayed backlight image and the new partition image, and determining a target current signal based on the target voltage coefficient; Adjusting the supply voltage of the LED backlight module to a target voltage according to the target current signal within the target time period, and the voltages in each channel of the LED backlight module after adjustment are all greater than the preset turning voltage; wherein, the target time period is the time period from receiving the gray data of the new partition image to sending the gray data to the backlight driver.

12. The method according to claim 11, characterized in that, The determining the target voltage coefficient according to at least one partition image in the currently displayed backlight image and the new partition image includes: Obtaining the gray data of at least one partition image in the currently displayed backlight image and the gray data with the largest gray value among the gray data of the new partition image; Determining the target voltage coefficient according to the gray data with the largest gray value.

13. The method according to claim 12, wherein The determining the target voltage coefficient according to the gray data with the largest gray value includes: Determining the target voltage coefficient corresponding to the gray data with the largest gray value according to the preset mapping relationship between the gray value and the voltage coefficient.

14. The method according to claim 13, wherein Before determining the target voltage coefficient corresponding to the gray data with the largest gray value according to the preset mapping relationship between the gray value and the voltage coefficient, the method further includes: Obtaining M test images within the preset gray range, and each test image corresponds to one gray value; When the LED backlight module displays the M-frame test images frame by frame, obtain the voltage coefficient corresponding to each gray value; wherein, the mapping relationship between each gray value and the voltage coefficient corresponding to the gray value is the preset mapping relationship.

15. The method according to claim 14, characterized in that The obtaining the voltage coefficient corresponding to each gray value when the LED backlight module displays the M-frame test images frame by frame includes: When the LED backlight module displays the M-frame test images frame by frame, adjust the power supply voltage of the LED backlight module frame by frame by adjusting the voltage coefficient; When the voltages in each channel of the N backlight partitions of the LED backlight module after adjustment are all greater than the preset turning voltage, save the voltage coefficient; Obtain the preset mapping relationship according to the gray value of each frame of test image and the voltage coefficient corresponding to the gray value.

16. The method according to claim 14, characterized in that, The method further includes: Receive a calibration instruction, generate a mapping relationship between each gray value within the preset gray range and the voltage coefficient corresponding to the gray value according to the calibration instruction, and update the preset mapping relationship with the newly generated mapping relationship.

17. The method according to claim 15, wherein The LED backlight module displays the M-frame test images frame by frame, including: the LED backlight module displays the M-frame test images frame by frame in ascending order of image gray values; The adjusting the power supply voltage of the LED backlight module frame by frame by adjusting the voltage coefficient includes: Gradually increase the power supply voltage of the LED backlight module frame by frame by increasing the voltage coefficient; When the voltages in each channel of the LED backlight module after adjustment are not all greater than the preset turning voltage, continue to adjust the power supply voltage of the LED backlight module by increasing the voltage coefficient; When the voltages in each channel of the LED backlight module after adjustment are all greater than the preset turning voltage, save the voltage coefficient.

18. The method according to any one of claims 14 to 17, wherein The preset gray scale range is [0, 2 K -1], where K is the bit depth of the image displayed by the LED backlight module, and each gray scale value within the preset gray scale range corresponds to a voltage coefficient.

19. The method according to any one of claims 14 to 17, characterized in that, The obtaining the voltage coefficient corresponding to each gray value includes: Equally divide the step intervals of all gray values within the preset gray range at equal intervals, and the gray values within one step interval correspond to one voltage coefficient.

20. The method according to any one of claims 1 to 17, characterized in that, The preset gray range includes multiple gray ranges; Within the first gray range, consecutive S gray values correspond to one voltage coefficient; Within the second gray range, consecutive T gray values correspond to one voltage coefficient; Wherein, the first gray range and the second gray range are two gray ranges within the preset gray range; the gray values within the first gray range are less than the gray values within the second gray range, S is less than T, and both S and T are integers greater than 1.

21. A power supply voltage regulation system for an LED backlight module, characterized in that, It includes a power supply module, a backlight control module and an image source module; the backlight control module is respectively connected to the power supply module and the image source module; the LED backlight module includes N backlight partitions, and N is an integer greater than 1; The image source module is configured to send the next frame of backlight image of the currently displayed backlight image to the backlight control module; The backlight control module is configured to receive the next-frame backlight image, determine a target voltage coefficient according to the next-frame backlight image, and determine a target current signal based on the target voltage coefficient; The backlight control module is further configured to send the target current signal to the power supply module within a target time period; wherein, the target time period is the time period after the currently displayed backlight image is displayed and before the next-frame backlight image is displayed; The power supply module is configured to adjust the supply voltage of the LED backlight module to a target voltage according to the target current signal within the target time period; the voltages in each channel of the adjusted LED backlight module are all greater than a preset turn-on voltage.

22. A power supply voltage regulation system for an LED backlight module, characterized in that, It includes a power supply module, a backlight control module, and an image source module; the backlight control module is respectively connected to the power supply module and the image source module; the LED backlight module includes N backlight zones, where N is an integer greater than 1; The image source module is configured to send a new zone image to the backlight control module; the new zone image is a zone image data in the currently displayed backlight image, or the new zone image is a zone image data in the next-frame backlight image of the currently displayed backlight image; The backlight control module is configured to receive the new zone image, determine a target voltage coefficient according to at least one zone image in the currently displayed backlight image and the new zone image, and determine a target current signal based on the target voltage coefficient; The backlight control module is further configured to send the target current signal to the power supply module within a target time period; wherein, the target time period is the time period from receiving the gray-scale data of the new zone image to sending the gray-scale data to the backlight driver; The power supply module is configured to adjust the supply voltage of the LED backlight module to a target voltage according to the target current signal within the target time period, and the voltages in each channel of the adjusted LED backlight module are all greater than a preset turn-on voltage.

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