Backlight control method and system, display device, readable storage medium

Abstract

The present disclosure relates to a backlight control method and system, a display device and a readable storage medium. The method comprises: obtaining a backlight control signal, the backlight control signal comprising a mode signal and a data signal; obtaining the mode signal in the backlight control signal, the mode signal comprising a phase adjustment signal or a region dimming signal; in response to the mode signal being the phase adjustment signal, writing the data signal corresponding to the mode signal to a light source driving module, so that the light source driving module adjusts the phase of a backlight light source according to the data signal. In this embodiment, by adding the phase adjustment signal in the backlight control signal, the front-end device can directly adjust the backlight refresh phase, without the need to increase hardware and being convenient and fast.

Description

Technical Field

[0001] This disclosure relates to the field of data processing technology, and in particular to a backlight control method and system, a display device, and a readable storage medium. Background Technology

[0002] As display products become larger and brighter, the number of backlight driving devices required for these products also increases. Consequently, the interference from these backlight driving devices also increases. For example, some interference frequencies are similar to those of components such as touchscreens, which may affect the normal operation of the touchscreen or lead to a deterioration in EMI performance. Summary of the Invention

[0003] This disclosure provides a backlight control method and system, a display device, and a readable storage medium to address the shortcomings of related technologies.

[0004] According to a first aspect of the present disclosure, a backlight control method is provided, comprising:

[0005] Acquire a backlight control signal, the backlight control signal including a mode signal and a data signal;

[0006] Obtain the mode signal from the backlight control signal, wherein the mode signal includes a phase adjustment signal or a local dimming signal;

[0007] In response to the mode signal being the phase adjustment signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the phase of the backlight source according to the data signal.

[0008] Optionally, acquiring the mode signal in the backlight control signal includes:

[0009] The mode signal in the backlight control signal is analyzed; the value of the mode signal includes a first value representing the phase adjustment mode and a second value representing the area dimming mode;

[0010] In response to the mode signal taking the first value, the mode signal is determined to be the phase adjustment signal; in response to the mode signal taking the second value, the mode signal is determined to be the area dimming signal.

[0011] Optionally, the method further includes:

[0012] In response to the detection of a reporting signal, a backlight control signal is acquired, which includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase.

[0013] Optionally, a backlight control signal is acquired, comprising a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including:

[0014] Obtain the current backlight refresh phase and the current scan frequency of the display screen;

[0015] Retrieve the next backlight refresh phase from the preset lookup table;

[0016] The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the backlight refresh phase of the next sequence.

[0017] Optionally, a backlight control signal is acquired, comprising a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including:

[0018] Obtain the backlight refresh phase corresponding to the position in the reporting signal;

[0019] Determine the target backlight refresh phase in the preset lookup table whose backlight refresh phase difference exceeds a preset threshold;

[0020] The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the target backlight refresh phase.

[0021] Optionally, the method further includes:

[0022] Send a phase adjustment signal corresponding to the target scanning frequency to the display screen so that the display screen adjusts to the target scanning frequency.

[0023] Optionally, the method further includes:

[0024] The backlight control signal is verified.

[0025] Optionally, the method further includes:

[0026] In response to the mode signal being the area dimming signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the brightness of the backlight according to the data signal in the backlight control signal.

[0027] According to a second aspect of the present disclosure, a backlight system is provided, including a main control board and a backlight control unit; the backlight control unit is connected to the main control board;

[0028] The main control board is used to acquire a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase in response to the detection of a reporting signal.

[0029] The backlight control unit is configured to acquire the backlight control signal, which includes a mode signal and a data signal; acquire the mode signal in the backlight control signal, which includes a phase adjustment signal or a local dimming signal; and, in response to the mode signal being the phase adjustment signal, write the data signal corresponding to the mode signal into the light source driving module so that the light source driving module adjusts the phase of the backlight source according to the data signal.

[0030] Optionally, the backlight control unit acquires the mode signal from the backlight control signal, including:

[0031] The mode signal in the backlight control signal is analyzed; the value of the mode signal includes a first value representing the phase adjustment mode and a second value representing the area dimming mode;

[0032] In response to the mode signal taking the first value, the mode signal is determined to be the phase adjustment signal; in response to the mode signal taking the second value, the mode signal is determined to be the area dimming signal.

[0033] Optionally, the main control board acquires a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including:

[0034] Obtain the current backlight refresh phase and the current scan frequency of the display screen;

[0035] Obtain the next sequential backlight refresh phase at the current backlight refresh phase under the current scanning frequency from the preset lookup table;

[0036] The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the backlight refresh phase of the next sequence.

[0037] Optionally, the main control board acquires a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including:

[0038] Obtain the backlight refresh phase corresponding to the position in the reporting signal;

[0039] Determine the target backlight refresh phase in the preset lookup table whose backlight refresh phase difference exceeds a preset threshold;

[0040] The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the target backlight refresh phase.

[0041] Optionally, the main control board is also used to send a target scanning frequency corresponding to the phase adjustment signal to the display screen, so that the display screen is adjusted to the target scanning frequency.

[0042] Optionally, the backlight control unit is further configured to perform verification processing on the backlight control signal after receiving the backlight control signal.

[0043] Optionally, the backlight control unit is further configured to:

[0044] In response to the mode signal being the area dimming signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the brightness of the backlight according to the data signal in the backlight control signal.

[0045] According to a third aspect of the present disclosure, a display device is provided, including a backlight system and a display screen as described in any of the second aspects;

[0046] The display screen is used to generate a reporting signal and send it to the backlight system;

[0047] The backlight system is used to adjust the backlight refresh phase according to the reporting signal.

[0048] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, which, when an executable computer program in the storage medium is executed by a processor, enables the implementation of the method as described in any of the first aspects.

[0049] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0050] As can be seen from the above embodiments, the solution provided in this disclosure can acquire a backlight control signal, which includes a mode signal and a data signal; then, the mode signal in the backlight control signal is acquired, and the mode signal includes a phase adjustment signal or a local dimming signal; subsequently, in response to the mode signal being the phase adjustment signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the phase of the backlight source according to the data signal. Thus, by adding a phase adjustment signal to the backlight control signal in this embodiment, the backlight refresh phase can be directly adjusted by the front-end device without adding hardware, which is convenient and fast.

[0051] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0052] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0053] Figure 1This is a block diagram illustrating a backlight system according to an exemplary embodiment.

[0054] Figure 2 This is a flowchart illustrating a backlight control method according to an exemplary embodiment.

[0055] Figure 3 This is a flowchart illustrating another backlight control method according to an exemplary embodiment. Detailed Implementation

[0056] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described below by way of example do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatus consistent with some aspects of this disclosure as detailed in the appended claims. It should be noted that, without conflict, the following embodiments and features in the implementation methods can be combined with each other.

[0057] As display products become larger and brighter, the number of backlight driving devices required for these products also increases. Consequently, the interference from these backlight driving devices also increases. For example, some interference frequencies are similar to those of components such as touchscreens, which may affect the normal operation of the touchscreen or lead to a deterioration in EMI performance.

[0058] Currently, the backlight drivers of various display devices do not have the function of adjusting the phase through the front-end device. When the above problem occurs, it can only be solved by firmware adjustment, adding filtering circuits or adding shielding methods, which is both inconvenient and increases costs.

[0059] To address the aforementioned technical problems, this disclosure provides a backlight control method and system, a display device, and a readable storage medium. Considering that the main control board in the backlight system can receive audio and video signals from outside the backlight system and generate backlight control signals based on the parsed audio and video signals, the main control board can serve as a front-end device for the backlight control unit in the backlight system. The inventive concept of this disclosure lies in adding a phase adjustment signal to the backlight control signal of the backlight control unit; when the backlight control signal contains a phase adjustment signal, the phase of the backlight source is adjusted to achieve the effect of controlling the phase of the backlight source. Alternatively, this embodiment allows for phase control of the backlight source at the front end, which, compared to related technologies, eliminates the need for additional hardware, resulting in a simple implementation without increasing costs.

[0060] Figure 1 This is a block diagram illustrating a backlight system according to an exemplary embodiment, see [link to example diagram]. Figure 1The backlight system includes a main control board, a backlight control unit, and a backlight source. The backlight control unit may include a microcontroller (such as an MCU) and a light source driver module (such as an LED driver). The main control board is connected to the microcontroller in the backlight control unit, and the light source driver module in the backlight control unit is connected to the backlight source (such as an LED). The main control board can generate backlight control signals and send them to the microcontroller in the backlight control unit. The microcontroller can analyze the backlight control unit to determine and adjust the phase or regional brightness of the backlight source, thus implementing the backlight control method provided in this embodiment, enabling the light source driver module to adjust the phase or regional brightness of the backlight source.

[0061] Figure 2 This is a backlight control method illustrated according to an exemplary embodiment, see [link to example]. Figure 2 A backlight control method, comprising steps 21 to 23.

[0062] In step 21, a backlight control signal is acquired, which includes a mode signal and a data signal.

[0063] In this step, the main control board in the backlight system can acquire the image frame data to be displayed on the screen, determine the backlight data of the screen based on the image frame data, and generate a backlight control signal based on the backlight data. The scheme for determining the backlight control signal based on the image frame data can refer to relevant technologies, and the corresponding scheme falls within the protection scope of this disclosure. Taking the communication between the main control board and the microcontroller via a Serial Peripheral Interface (SPI) as an example, the format of this backlight control signal is shown in Table 1.

[0064] Taking adjusting the brightness of the backlight source (i.e., adjusting the backlight brightness of the display screen) as an example, after receiving the backlight control signal, the main control board will write the duty cycle data of each backlight source into the backlight driver module. Considering the large size of the display screen and the large number of backlight sources used in the display screen, the backlight sources will be partitioned in this example, and the backlight sources in each partition will be controlled uniformly.

[0065] Table 1 Backlight control signals in SPI format

[0066]

[0067] It should be noted that the above SPI Hardware refers to the SPI hardware, SPI Protocol refers to the SPI protocol, VSYNC represents the synchronization signal, CS / SDI / SDO / SCK represent the chip select information, input signal, output signal, and clock signal, respectively, High / Low / Freq represent high voltage, low level, and time frequency, Indicator / Command / Mode / Dimming Data represent the frame header, command, mode, and duty cycle data, respectively, check sum data represents the XOR value, Data FieldDefinition represents the data field definition, Global Dimming represents the global dimming mode, Local DimmingEnable represents the local dimming mode, LD On / off represents local dimming on or off, and 168ea represents 168 data points.

[0068] Understandably, the microcontroller writes the duty cycle data for one partition at a time, then writes the duty cycle data for the next partition, and so on, until the duty cycle data for all partitions has been written. Therefore, the time period corresponding to the written duty cycle data is the phase of the corresponding partition, or the phase of the backlight source. The backlight driver module in the backlight control unit can control the backlight source to be on or off based on the written duty cycle data, thereby adjusting the brightness of the backlight source.

[0069] Understandably, during the switching process of the backlight driver module, taking the on state as an example, the output voltage of the backlight driver module jumps from 0V to a preset voltage (such as 5-20V); taking the off state as an example, the output voltage of the backlight driver module drops from the preset voltage to 0V. During the switching process of the backlight driver module, the output voltage of the backlight driver module changes back and forth in a low-high-low-high pattern, at which time it can act as an electromagnetic radiation source.

[0070] If the voltage conversion frequency of the backlight driver module matches the operating frequency of the touchpad (capacitor) in the display screen—for example, if the voltage conversion frequency is equal to the sampling frequency of the capacitor in the touchpad—then the capacitor in the touchpad can sense the voltage change of the backlight driver module and output a false alarm signal. The main control board in related technologies processes this false alarm signal as a normal one. However, this false alarm signal is essentially a false alarm; processing it as a normal signal would lead to various problems, such as automatically redirecting to different interfaces and adjusting the backlight accordingly, thus degrading the user experience.

[0071] In this step, the touchpad in the display screen sends the reporting signal to the backlight system after detecting it. After receiving the reporting signal, the main controller in the backlight system can determine whether the reporting signal is a normal reporting signal (i.e., a reporting signal generated after the touchpad detects the user's touch operation) or a false reporting signal (i.e., a reporting signal caused by the backlight driving module as described in the above embodiment).

[0072] In one example, the main control board can detect the duration of the aforementioned reporting signal. When the duration is greater than or equal to a preset duration threshold, the main control board can determine that the reporting signal is a false alarm signal; when the duration is less than the preset duration threshold, the main control board can determine that the reporting signal is a normal reporting signal. This is because the duration of a user's touch operation on the display screen is usually short (e.g., 1-5 seconds). Therefore, the preset duration threshold, exceeding the maximum duration of the touch operation, can be used to distinguish between normal and false reporting signals. The maximum duration of the touch operation can be an empirical value or obtained by statistically analyzing the touch operation durations of more than a preset number of users; no limitation is imposed here.

[0073] In another example, the main control board can detect the touch area corresponding to the aforementioned reporting signal. When the touch area is greater than or equal to a preset touch area threshold, the main control board can determine that the reporting signal is a false alarm signal; when the touch area is less than the preset touch area threshold, the main control board can determine that the reporting signal is a normal reporting signal. This is because the maximum area a user can use for touch operation is the palm area, typically the area of ​​1-3 fingertips, while the area corresponding to a false alarm is usually a section of the display screen, and the palm area is smaller than the area corresponding to the false alarm. Therefore, the preset touch area threshold can be an empirical value, or it can be obtained by statistically analyzing the palm areas of several users using big data, or it can be a value between the palm area and the fingertip area. An appropriate threshold value can be selected according to the specific scenario, and the corresponding solution falls within the protection scope of this disclosure.

[0074] In another example, the main control board can detect the length corresponding to the aforementioned reporting signal. When the length is greater than or equal to a preset length threshold, the main control board can determine that the reporting signal is a false alarm signal; when the length is less than the preset length threshold, the main control board can determine that the reporting signal is a normal reporting signal. This is because the maximum length of a user's touch operation is the length of their palm, while the length of a false alarm point is usually a long strip (such as from one side of the display screen to the other). Therefore, the length of the touch operation is generally less than the length of the false alarm point. Based on the above, the preset length threshold can be an empirical value or obtained by statistically analyzing the lengths of several users using big data. An appropriate threshold value can be selected according to the specific scenario, and the corresponding solution falls within the protection scope of this disclosure.

[0075] In another example, the main control board can detect the shape corresponding to the aforementioned reporting signal and determine whether it is a hand shape, such as an oval or a palm shape. The main control board can contain a shape recognition model, such as a neural network model. The touch image containing the reporting signal is input into the shape recognition model, which then identifies whether it is a hand shape. When the shape is not a hand shape, the main control board determines that the reporting signal is a false alarm; when the shape is a hand shape, the main control board determines that the reporting signal is a normal reporting signal. This is because the shape of the touch operation position during user touch operation is regular and smooth, while the shape of the position corresponding to a false alarm is usually irregular.

[0076] It should be noted that the above embodiments describe schemes for determining whether a reporting signal is a false alarm signal by using parameters such as duration, area, shape and length. In practical applications, at least two of the above parameters can be combined, for example, using area and duration together to determine whether a reporting signal is a false alarm signal. As long as the parameters do not conflict, the combined scheme falls within the protection scope of this disclosure.

[0077] In this step, after determining that the alarm signal is a false alarm signal, the main control board can obtain a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase.

[0078] In one example, the main control board can obtain the current backlight refresh phase and the current scanning frequency of the display. Then, the main control board can obtain the next backlight refresh phase from a preset lookup table. The lookup table includes at least one backlight refresh phase corresponding to different scanning frequencies (without mutual interference), and the at least one backlight refresh phase corresponding to each scanning frequency is sorted according to phase magnitude.

[0079] Table 2 shows the relationship between scan frequency and backlight refresh phase.

[0080]

[0081] In Table 2, the scanning frequency is the scanning frequency of the touchpad (TX) in the display screen, CH1~CH16 indicates that the backlight driving module includes channels 1~16, 0x00~0xFF indicates the backlight refresh phase, and 0x11, 0x13 and 0x0D indicate the scanning frequency.

[0082] Understandably, if the current backlight refresh phase (assuming its order is 0) is the same as or close to the current scanning frequency, then the difference between the next-order backlight refresh phase in the lookup table (assuming its order is 1) and the current scanning frequency will become larger or mismatched, potentially no longer affecting the display screen. Therefore, the main control board can adjust the mode signal of the backlight control signal to phase adjustment information and adjust the data signal to the next-order backlight refresh phase, thus obtaining a backlight control signal. At this point, the current backlight refresh phase has been updated to the next-order backlight refresh phase (i.e., the current backlight refresh phase order is 1). If the current backlight refresh phase (order 1) still does not meet the requirements, it continues to be updated to the next order in the lookup table (assuming its order is 2) until no more false alarm signals appear. In this embodiment, the backlight refresh phase is adjusted in sequence. When the backlight refresh phase interval is reasonable (such as the difference between two adjacent backlight refresh phases exceeding a preset difference threshold) and the number is small, the backlight refresh phase can be adjusted to match. That is, the noise interference generated by the backlight control unit disappears, causing the false alarm signal to disappear and improving the user experience.

[0083] In another example, the main control board can obtain the backlight refresh phase corresponding to the position in the reporting signal. Then, the main control board can determine a target backlight refresh phase in a preset lookup table whose backlight refresh phase difference exceeds a preset threshold. This preset threshold can be an empirical value or obtained through extensive experimental statistics; its purpose is to ensure that the difference between the target backlight refresh phase and the current backlight refresh phase is sufficiently large, thereby keeping the noise frequency causing the reporting signal away from the current scanning frequency of the display screen. Afterward, the main control board can adjust the mode signal of the backlight control signal to a phase adjustment signal and adjust the data signal to the aforementioned target backlight refresh phase, thus obtaining a backlight control signal. In this embodiment, by finding a target backlight refresh phase that differs from the current backlight refresh phase by more than a preset threshold, the desired refresh phase can be quickly adjusted, meaning that the noise interference generated by the backlight control unit disappears, causing the false reporting signal to disappear and improving the user experience.

[0084] In one example, taking the backlight control signal in SPI format, the main control board can set the mode signal (i.e., Mode) in the backlight control signal to a first value, such as 0x0000, where the first value represents the phase adjustment mode. After confirming that the reporting signal is a normal reporting signal, the main control board can acquire the backlight control signal containing the mode signal as a local dimming signal and the data signal as duty cycle data. For example, when the backlight control signal is in SPI format, its mode signal (i.e., Mode) can be set to a second value, such as 0xFFFF, where the second value represents the local dimming mode. Then, the main control board can send the backlight control signal to the backlight control unit. In this way, the backlight control unit can acquire the backlight control signal, which includes both the mode signal and the data signal. Continuing with the example of communication between the main control board and the microcontroller via a Serial Peripheral Interface (SPI), the SPI format backlight control signal is shown in Table 3.

[0085] Table 3 Backlight control signals in SPI format

[0086]

[0087]

[0088] It should be noted that phase data refers to phase data, using data1 to data8.

[0089] It should be noted that before sending the backlight control signal to the backlight control unit, the main control board can perform an XOR operation on the backlight control signal to obtain a processing result; this processing result is then sent to the backlight control unit as part of the backlight control signal. Correspondingly, after receiving the backlight control signal, the backlight control unit can perform an XOR operation on the backlight control signal to obtain a verification result; then, it compares the verification result with the processing result. If they are the same, the received backlight control signal is determined to be correct; if they are different, the received backlight control signal is determined to be incorrect, and the main control board can be notified to resend the signal. Thus, by verifying the backlight control signal in this step, the normal transmission of the backlight control signal can be ensured, ultimately achieving accurate backlight control.

[0090] It is understood that, in addition to XOR processing, the above-mentioned verification methods for backlight control signals can also employ methods such as generating a sum check or cyclic redundancy check code verification, or using a message digest algorithm to generate a message digest for verification. As long as the backlight control signal received by the microcontroller can be verified to be correct, the above-mentioned verification methods or combinations of verification methods all fall within the protection scope of this disclosure.

[0091] In step 22, the mode signal in the backlight control signal is obtained, and the mode signal includes a phase adjustment signal or a local dimming signal.

[0092] In this step, the backlight control unit in the backlight system can acquire the mode signal from the aforementioned backlight control signal. For example, the microcontroller in the backlight control unit can parse the mode signal from the backlight control signal. The value of the mode signal may include a first value representing a phase adjustment mode and a second value representing a local dimming mode. The microcontroller can determine that the mode signal is a phase adjustment signal in response to the mode signal being the first value (e.g., 0x0000). Alternatively, the microcontroller can determine that the mode signal is a local dimming signal in response to the mode signal being the second value (e.g., 0xFFFF).

[0093] Taking the backlight control signal as an example of SPI format, the microcontroller in the backlight control unit can read the value of Mode in the SPI signal. When the value of Mode is 0x0000, the microcontroller can determine that the mode signal is a phase adjustment signal. When the value of Mode is 0xFFFF, the microcontroller can determine that the mode signal is a local dimming signal.

[0094] In step 23, in response to the mode signal being the phase adjustment signal, the data signal corresponding to the mode signal is written to the light source driving module so that the light source driving module adjusts the phase of the backlight source according to the data signal.

[0095] In this step, the microcontroller in the backlight control unit can respond to the mode signal being a phase adjustment signal and write the data signal corresponding to the mode signal (i.e., the data signal in the same backlight control signal, where the data signal is phase data) to the light source driving module.

[0096] Understandably, after writing the phase data to the light source driver module, the main control board can continue to generate a backlight control signal, which includes a local dimming signal. The microcontroller, responding to the mode signal being a local dimming signal, can write the corresponding data signal (i.e., the data signal within the same backlight control signal, which is now duty cycle data) to the light source driver module. In this way, the light source driver module can adjust the phase of the backlight source according to the aforementioned phase data and adjust the brightness of the backlight source based on the aforementioned duty cycle data.

[0097] In another example, when the backlight control signal is a local dimming signal instead of a phase adjustment signal, the microcontroller in the backlight control unit can respond to the mode signal being a local dimming signal by writing the data signal corresponding to the mode signal (i.e., the data signal in the same backlight control signal, where the data signal is the duty cycle data) to the light source driver module.

[0098] In one embodiment, see further. Figure 1 The main control board can also send a setting signal to the touchpad of the display screen. This setting signal can be a target scanning frequency or an identifier code corresponding to the target scanning frequency. After receiving the setting signal, the touchpad can adjust its scanning frequency to the target scanning frequency. This target scanning frequency does not interfere with the backlight refresh camera of the backlight source, thus avoiding false alarms. In this way, this example can adjust the scanning frequency or simultaneously adjust the scanning frequency and backlight refresh phase to accelerate the repair of false alarms.

[0099] Thus, the solution provided in this embodiment can obtain a backlight control signal, which includes a mode signal and a data signal; then, the mode signal in the backlight control signal is obtained, and the mode signal includes a phase adjustment signal or a local dimming signal; subsequently, in response to the mode signal being the phase adjustment signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the phase of the backlight source according to the data signal. In this way, by adding a phase adjustment signal to the backlight control signal in this embodiment, the backlight refresh phase can be directly adjusted by the front-end device without adding hardware, which is convenient and fast.

[0100] The following describes a backlight control method provided in this disclosure, using SPI interface communication between the main control board and the microcontroller. (See also...) Figures 1-3 ,include:

[0101] 1. Main control board

[0102] (1) Conduct a test experiment in advance to obtain the frequency and phase combination that does not interfere with the scanning frequency and backlight refresh phase of the display screen (middle touch panel), and store the above frequency and phase combination in the local memory of the main control board in the form of a look-up table.

[0103] (2) After the backlight system is powered on, the power-on initialization is performed. At this time, the main control board can select a set of default display scanning frequencies and backlight refresh phases through a lookup table.

[0104] (3) When the touchpad sends a reporting signal, determine whether it is a false reporting signal; if it is a normal reporting signal, perform the corresponding operation; if it is a false reporting signal, look up a set of scanning frequency and backlight refresh camera from the lookup table to realize the self-repair of false reporting points.

[0105] 2. Backlight control unit

[0106] (1) Acquire and parse the backlight control signal to obtain the phase adjustment signal and the area dimming signal in the mode signal, that is, perform mode selection to determine the phase adjustment mode or the area dimming mode. Among them, the aforementioned phase adjustment signal and area dimming signal are set by the main control board during the generation of the backlight control signal to avoid phases that may cause interference, so as to achieve better overall reliability and display effect.

[0107] (2) The backlight control signals in SPI format include:

[0108] Indicator: The frame header is fixed at 0x7ff8;

[0109] Command: Command data is 0xfffc

[0110] Mode: Mode selection

[0111] Mode = 0xffff indicates local dimming mode; Data1 to Data168 are the duty cycle data for setting the backlight driver module (LED Driver). Data1 to Data168 divide the backlight area of ​​the display screen into 168 zones.

[0112] Mode = 0x000 is the phase adjustment mode; in this example, the backlight refresh phase takes 8 data points from Data1 to Data8, and Data9 to Data168 are set to 0x000. Since the phase adjustment setting is 8 bits, and Data1 to 168 are 16 bits of data, Data1 to Data8 can be split into high 8 bits and low 8 bits of data and written to the registers of the backlight driver module.

[0113] It should be noted that Data1 to 168 represent 168 partitions in the backlight area, with each data point corresponding to one partition. Therefore, 168 output terminals (i.e., channels) are required for the backlight driver. Considering that each backlight driver chip in the backlight driver module can provide 16 channels, at least 11 backlight driver chips are needed to cover the channels required for the aforementioned 168 partitions. Considering redundancy, 16 backlight driver chips are selected in this embodiment. Each channel contains 8 bits of data, allowing 256 phases to be selected for the backlight source in each partition. It is understood that the number of backlight driver chips and the number of phases can be adjusted according to specific scenarios and are not limited here.

[0114] When the microcontroller starts receiving SPI signals, it can identify the Indicator; when the Indicator value is 0x7ff8, it identifies the Command; when the Command value is 0xfffc, it identifies the Mode. If the Mode value is 0xffff, the data signals Data1 to Data168 contain duty cycle data and are written to the phase drive module. If the Mode value is 0x0000, the data signals Data1 to Data8 contain phase data and are written to the phase drive module.

[0115] It should be noted that Data1 to Data168 above use 16 bits, which can be increased or decreased according to usage requirements in actual applications; in addition, there are no restrictions on the content of the Command.

[0116] (3) Data1~Data 168: Phase data and duty cycle data.

[0117] (4) CheckSum: The processed value obtained by XORing the data:

[0118] CheckSum=Indicator^Command^Mode^Data1...^Data168.

[0119] Thus, in this embodiment, the main control board can modify the scanning frequency of the display screen (middle touch panel) or the backlight refresh phase of the backlight source, thereby enabling self-repair of false alarm points.

[0120] Based on the aforementioned backlight control method, this disclosure also provides a backlight system, including a main control board and a backlight control unit; the backlight control unit is connected to the main control board;

[0121] The main control board is used to acquire a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase in response to the detection of a reporting signal.

[0122] The backlight control unit is configured to acquire the backlight control signal, which includes a mode signal and a data signal; acquire the mode signal in the backlight control signal, which includes a phase adjustment signal or a local dimming signal; and, in response to the mode signal being the phase adjustment signal, write the data signal corresponding to the mode signal into the light source driving module so that the light source driving module adjusts the phase of the backlight source according to the data signal.

[0123] In one embodiment, the backlight control unit acquires the mode signal from the backlight control signal, including:

[0124] The mode signal in the backlight control signal is analyzed; the value of the mode signal includes a first value representing the phase adjustment mode and a second value representing the area dimming mode;

[0125] In response to the mode signal taking the first value, the mode signal is determined to be the phase adjustment signal; in response to the mode signal taking the second value, the mode signal is determined to be the area dimming signal.

[0126] In one embodiment, the main control board acquires a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including:

[0127] Obtain the current backlight refresh phase and the current scan frequency of the display screen;

[0128] Obtain the next sequential backlight refresh phase at the current backlight refresh phase under the current scanning frequency from the preset lookup table;

[0129] The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the backlight refresh phase of the next sequence.

[0130] In one embodiment, the main control board acquires a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including:

[0131] Obtain the backlight refresh phase corresponding to the position in the reporting signal;

[0132] Determine the target backlight refresh phase in the preset lookup table whose backlight refresh phase difference exceeds a preset threshold;

[0133] The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the target backlight refresh phase.

[0134] In one embodiment, the backlight control unit is further configured to perform verification processing on the backlight control signal after receiving the backlight control signal.

[0135] In one embodiment, the backlight control unit is further configured to:

[0136] In response to the mode signal being the area dimming signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the brightness of the backlight according to the data signal in the backlight control signal.

[0137] It should be noted that the backlight system shown in this embodiment matches the content of the method embodiment, and the content of the above method embodiment can be referred to, which will not be repeated here.

[0138] This disclosure also provides a display device, see further embodiments thereof. Figure 1 This includes the aforementioned backlight system and display screen;

[0139] The display screen is used to generate a reporting signal and send it to the backlight system;

[0140] The backlight system is used to adjust the backlight refresh phase according to the reporting signal.

[0141] It should be noted that the display device shown in this embodiment matches the content of the method embodiment, and the content of the above method embodiment can be referred to, which will not be repeated here.

[0142] In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided, such as a memory including an executable computer program, which can be executed by a processor to achieve, for example... Figure 2 The method of the illustrated embodiment. The readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc.

[0143] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0144] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A backlight control method, characterized in that, include: In response to the detection of the reporting signal, a backlight control signal is acquired, which includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase; Obtain the mode signal from the backlight control signal, wherein the mode signal includes a phase adjustment signal or a local dimming signal; In response to the mode signal being the phase adjustment signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the phase of the backlight source according to the data signal; Acquire a backlight control signal that includes a mode signal (phase adjustment signal) and a data signal (backlight refresh phase), including: Obtain the current backlight refresh phase and the current scan frequency of the display screen; Retrieve the next backlight refresh phase from the preset lookup table; The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the backlight refresh phase of the next sequence.

2. The method according to claim 1, characterized in that, Acquiring the mode signal from the backlight control signal includes: The mode signal in the backlight control signal is analyzed; the value of the mode signal includes a first value representing the phase adjustment mode and a second value representing the area dimming mode; In response to the mode signal taking the first value, the mode signal is determined to be the phase adjustment signal; in response to the mode signal taking the second value, the mode signal is determined to be the area dimming signal.

3. The method according to claim 1, characterized in that, Acquire a backlight control signal that includes a mode signal (phase adjustment signal) and a data signal (backlight refresh phase), including: Obtain the backlight refresh phase corresponding to the position in the reporting signal; Determine the target backlight refresh phase in the preset lookup table whose backlight refresh phase difference exceeds a preset threshold; The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the target backlight refresh phase.

4. The method according to claim 1 or 3, characterized in that, The method further includes: Send a phase adjustment signal corresponding to the target scanning frequency to the display screen so that the display screen adjusts to the target scanning frequency.

5. The method according to claim 1, characterized in that, The method further includes: The backlight control signal is verified.

6. The method according to claim 1, characterized in that, The method further includes: In response to the mode signal being the area dimming signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the brightness of the backlight according to the data signal in the backlight control signal.

7. A backlight system, characterized in that, It includes a main control board and a backlight control unit; the backlight control unit is connected to the main control board; The main control board is used to acquire a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase in response to the detection of a reporting signal. The backlight control unit is configured to acquire the backlight control signal, which includes a mode signal and a data signal; acquire the mode signal in the backlight control signal, which includes a phase adjustment signal or a local dimming signal; and, in response to the mode signal being the phase adjustment signal, write the data signal corresponding to the mode signal into the light source driving module so that the light source driving module adjusts the phase of the backlight source according to the data signal. The main control board acquires a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including: Obtain the current backlight refresh phase and the current scan frequency of the display screen; Obtain the next sequential backlight refresh phase at the current backlight refresh phase under the current scanning frequency from the preset lookup table; The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the backlight refresh phase of the next sequence.

8. The system according to claim 7, characterized in that, The backlight control unit acquires the mode signal from the backlight control signal, including: The mode signal in the backlight control signal is analyzed; the value of the mode signal includes a first value representing the phase adjustment mode and a second value representing the area dimming mode; In response to the mode signal taking the first value, the mode signal is determined to be the phase adjustment signal; in response to the mode signal taking the second value, the mode signal is determined to be the area dimming signal.

9. The system according to claim 7, characterized in that, The main control board acquires a backlight control signal that includes a mode signal as a phase adjustment signal and a data signal as a backlight refresh phase, including: Obtain the backlight refresh phase corresponding to the position in the reporting signal; Determine the target backlight refresh phase in the preset lookup table whose backlight refresh phase difference exceeds a preset threshold; The backlight control signal is obtained by adjusting the mode signal of the backlight control signal to a phase adjustment signal and the data signal to the target backlight refresh phase.

10. The system according to claim 7 or 9, characterized in that, The main control board is also used to send the target scanning frequency corresponding to the phase adjustment signal to the display screen, so that the display screen is adjusted to the target scanning frequency.

11. The system according to claim 7, characterized in that, The backlight control unit is also used to perform verification processing on the backlight control signal after receiving it.

12. The system according to claim 7, characterized in that, The backlight control unit is also used for: In response to the mode signal being the area dimming signal, the data signal corresponding to the mode signal is written to the light source driving module, so that the light source driving module adjusts the brightness of the backlight according to the data signal in the backlight control signal.

13. A display device, characterized in that, Includes the backlight system and display screen as described in any one of claims 7 to 12; The display screen is used to generate a reporting signal and send it to the backlight system; The backlight system is used to adjust the backlight refresh phase according to the reporting signal.

14. A non-transitory computer-readable storage medium, characterized in that, When the executable computer program in the storage medium is executed by a processor, it can implement the method as described in any one of claims 1 to 6.

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