A backlight voltage control method, display system, device and medium

Abstract

This application relates to the field of display technology, specifically a backlight voltage control method, display system, device, and medium. The controller is applied to a display system, which includes a drive chain and a power supply connected to the controller. The drive chain has a driver with drive channels. Different channels have LEDs of different specifications. LEDs of the same specification are connected to the same power supply. When the driver reports undervoltage in the current control cycle, a voltage boost command is sent to the power supply until the driver stops reporting undervoltage. Then, the power supply that has not yet performed voltage reduction is selected as the target power supply, and a voltage reduction command is sent to it until the driver reports undervoltage, at which point voltage reduction stops. This process is repeated for all power supplies. This achieves adaptive adjustment of undervoltage for any LED, even when each driver chip carries LEDs of different specifications, corresponds to multiple power supplies, and there is no need for a regular arrangement of LEDs or complex mapping with power supplies.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a backlight voltage control method, display system, device, equipment and medium. Background Technology

[0002] Currently, the manufacturing process parameters of MiniLED RGB LED chips vary, resulting in significant differences in the forward voltages of the red, green, and blue LEDs under the same current conditions. For MiniLED display technology using AM / PM driving schemes, if the RGB LED strings are still powered by a single voltage, substantial energy loss will occur due to the voltage drop differences between the strings. Therefore, the common practice is to independently power the R / G / B channels and dynamically adjust the power supply voltage of each VLED according to the current required by different display screens, thereby effectively reducing unnecessary heat loss.

[0003] To address the need for independent power supply for three RGB channels, existing solutions typically use multiple power supplies for each driver chip lane. Each lane contains multiple driver ICs connected in series. Different channels on the same driver IC can support LEDs of different colors. All LEDs of the same color on all driver ICs within the lane are connected to the same power supply. In this solution, to ensure proper control of the multiple power supplies, the LED channels of each driver IC usually need to be arranged according to a fixed pattern. For example, when the driver... When the IC has 12 channels and the power supply is RGB three-way, channels 1, 4, 7, and 10 can be fixedly connected to red LEDs, with the positive terminals of the corresponding LEDs connected to the power supply corresponding to the red LEDs. Channels 2, 5, 8, and 11 can be fixedly connected to green LEDs, with the positive terminals of the corresponding LEDs connected to the power supply corresponding to the green LEDs. Channels 3, 6, 9, and 12 can be fixedly connected to blue LEDs, with the positive terminals of the corresponding LEDs connected to the power supply corresponding to the blue LEDs. To achieve multi-way power supply voltage adjustment, a complex mapping between channels and power supplies is usually required. This allows for voltage adjustment of the corresponding LEDs based on the mapping relationship. However, this complex mapping usually increases the development difficulty of the application. Furthermore, when the number of driver IC channels cannot be divided by the number of power supply channels (e.g., 8 channels corresponding to 3 power supplies), channel waste is inevitable, and the complex mapping problem will also arise, further increasing the development difficulty. Of course, the above problems also exist for scenarios with two colors and two independent power supplies or even multiple colors and multiple independent power supplies.

[0004] Therefore, the urgent problem to be solved is how to control the voltage of any LED undervoltage when each driver chip is equipped with LEDs of different specifications, corresponding to multiple power supplies, without the need for a regular arrangement of LEDs and a complex mapping with the power supplies. Summary of the Invention

[0005] In view of this, embodiments of this application provide a backlight voltage control method, display system, device, equipment, and medium to solve the problem of not being able to control the undervoltage of any LED when each driver chip is equipped with LEDs of different specifications, corresponding to multiple power supplies, and without the need for a regular arrangement of the LEDs and a complex mapping with the power supplies.

[0006] In a first aspect, embodiments of this application provide a backlight voltage control method. The backlight voltage control method is applied to a controller of a display system. The display system further includes at least one drive chain and at least two power supplies connected to the controller. The drive chain has M drivers connected in series, each driver having at least two drive channels. Different channels have LEDs of different specifications. LEDs of the same specification on all drivers in the drive chain are connected to the same power supply. M is a positive integer, including: If any driver reports undervoltage during the current control cycle, a voltage boost command is sent to all power supplies until none of the drivers report undervoltage. Take any power supply that has not performed voltage reduction as the target power supply, send a voltage reduction command to the target power supply until any driver reports undervoltage, then stop voltage reduction of the target power supply, and continue until all power supplies have been traversed.

[0007] Secondly, embodiments of this application provide a display system, the display system comprising: A controller, at least one drive chain connected to the controller, and at least two power supplies; The drive chain is equipped with M drivers connected in series. Each driver is equipped with at least two drive channels. Different specifications of LED beads are installed on different channels. All LED beads of the same specification on all drivers in the drive chain are connected to the same power supply. M is an integer greater than zero. The controller is used to execute the backlight voltage control method described in the first aspect above.

[0008] Thirdly, embodiments of this application provide a computer device, the computer device including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the backlight voltage control method as described in the first aspect above.

[0009] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the backlight voltage control method as described in the first aspect above.

[0010] The beneficial effects of this application embodiment compared with the prior art are as follows: The backlight voltage control method of this application is applied to the controller of a display system. The display system also includes at least one drive chain and at least two power supplies connected to the controller. M drivers are arranged in series on the drive chain. Each driver is provided with at least two drive channels. Different specifications of LED beads are arranged on different channels. LED beads of the same specification on all drivers in the drive chain are connected to the same power supply. M is an integer greater than zero. When any driver is received to report undervoltage in the current control cycle, a voltage boost command is sent to all power supplies until all drivers do not report undervoltage. Any power supply that has not performed voltage reduction is taken as the target power supply. A voltage reduction command is sent to the target power supply until any driver reports undervoltage. The voltage reduction of the target power supply is stopped until all power supplies are traversed.

[0011] When receiving an undervoltage signal from the driver, the closed-loop control logic of first boosting the overall voltage to eliminate the undervoltage and then reducing the voltage of each channel to optimize the process achieves adaptive adjustment of the undervoltage of any LED, even when each driver chip is equipped with LEDs of different specifications, corresponds to multiple power supplies, and there is no need for regular arrangement of LEDs or complex mapping with the power supplies. This reduces the difficulty of system hardware layout and software configuration complexity. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a display system provided in Embodiment 1 of this application; Figure 2 This is a schematic flowchart of a backlight voltage control method provided in Embodiment 2 of this application; Figure 3 This is a schematic flowchart of a backlight voltage control method provided in Embodiment 3 of this application; Figure 4 This is a schematic diagram of the overall process of a backlight voltage control method provided in Embodiment 3 of this application; Figure 5 This is a schematic diagram of the structure of a backlight voltage control device provided in Embodiment 4 of this application; Figure 6 This is a schematic diagram of the structure of a computer device provided in Embodiment 5 of this application. Detailed Implementation

[0014] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0015] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0016] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0017] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0018] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0020] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0021] To illustrate the technical solution of this application, specific embodiments are described below.

[0022] See Figure 1 This is a schematic diagram of a display system provided in Embodiment 1. The display system includes a controller, at least one drive chain (i.e., a lane) connected to the controller, and at least two power supplies. The drive chain is equipped with M drivers connected in series. Each driver is equipped with at least two drive channels. Different specifications of LEDs are installed on different channels. LEDs of the same specification on all drivers in the drive chain are connected to the same power supply. M is an integer greater than zero. The controller is used to execute the backlight voltage control method described below.

[0023] like Figure 1 As shown, the controller of this display system can be an active device such as a timing controller (e.g., a backlight controller (BCON), a dimming controller (DCON)), a microcontroller unit (MCU), a system-on-chip (SoC), or a scaler chip. Taking the timing controller as an example, the display system also includes n drive chains connected to the timing controller (e.g., the link between DIS1 and DOS1, ..., and the link between DISn and DOSn, i.e., n links) and n power supplies (e.g., DC-DC_1, DC-DC_2, ..., and DC-DC_n). Each drive chain is equipped with M drivers connected in series (i.e., drivers IC1_1, IC1_2, ..., and IC1_m connected in series on the drive chain between DIS1 and DOS1). Each driver is equipped with 3 drive channels, and different specifications of LEDs are set on different channels (i.e., driver IC...). 1_1 has 3 drive channels, which are connected to DC-DC_1, DC-DC_2 and DC-DC_n respectively through D1, D2 and D3 (D1, D2 and D3 are LEDs of different specifications). In the drive chain, LEDs of the same specification on all drivers are connected to the same power supply. In the drive chain between DIS1 and DOS1, LEDs of the same specification D1, D4, ... and Dn-2 on all drivers IC1_1, IC1_2, ... and IC1_m are connected to DC-DC_1, LEDs of the same specification D2, D5, ... and Dn-1 are connected to DC-DC_2, and LEDs of the same specification D3, D6, ... and Dn are connected to DC-DC_n.

[0024] In this system, VIN is the input power supply for the entire system, i.e., the raw power supply for all DC-DC converters. VLED1+ is the positive output of DC-DC_1, and FB_1 is the feedback pin signal for DC-DC_1. VLED2+ is the positive output of DC-DC_2, and FB_2 is the feedback pin signal for DC-DC_2. VLEDn+ is the positive output of DC-DC_n, and FB_n is the feedback pin signal for DC-DC_n. R1, R2, R3, R4, R5, R6, R7, R8, and R9 are resistors, mainly used for voltage division, current limiting, and feedback detection.

[0025] Figure 1 The communication mode between the timing controller and the driver shown is a full-duplex mode based on the driver chain. That is, DIS is used as the downlink channel for the timing controller to send control commands (such as voltage regulation commands) to each level of the driver, and DOS is used as the uplink channel for each level of the driver to send back status data (such as undervoltage signals) to the timing controller. The timing controller and the driver can perform bidirectional data interaction at the same time. For example, when the timing controller sends control commands through DIS, the driver can simultaneously send back the status data of the previous cycle through DOS.

[0026] Optionally, the communication mode between the timing controller and the driver can also be half-duplex mode. That is, there can be only one bidirectional signal bus, DIS, as the drive chain to connect all drivers in series. There is no independent uplink feedback channel (DOS is omitted or disabled). All instructions and status data are transmitted through DIS. At any given time, only one direction of signal transmission is allowed on DIS. Bidirectional interaction is achieved through timing control. For example, during the downlink period, the timing controller occupies DIS to send control instructions, and all drivers are in the receiving state. During the uplink period, each level of driver occupies DIS in a time-sharing manner to send status data back to the timing controller, and the timing controller is in the receiving state.

[0027] like Figure 2 The diagram shown is a flowchart illustrating a backlight voltage control method according to Embodiment 2 of this application. This embodiment uses a controller applied to a display system as an example, and the backlight voltage control method may include the following steps: Step S201: When any driver reports undervoltage during the current control cycle, a voltage boost command is sent to all power supplies until none of the drivers report undervoltage.

[0028] The display system can refer to an overall hardware system consisting of a controller, at least one drive chain, at least two power supplies, and multiple drivers connected in series on the drive chain, used to control the backlight voltage of LED beads. The drive chain can refer to a signal transmission line connected to the controller and having M drivers connected in series, where M is an integer greater than zero. The driver can refer to a driver chip that provides drive output to the LED beads connected to its drive channel. The drive channel can refer to the drive output port of an independent LED bead inside the driver. Each driver has at least two drive channels. Different specifications of LED beads can refer to LED beads with different forward voltage (VF value) characteristics, which can correspond to LED beads of different colors (such as red, green, and blue LED beads). The current control cycle can refer to the cycle of voltage control when the LED bead is undervoltage. The voltage boost command can refer to the control command sent to the power supply to boost the output voltage to eliminate the undervoltage state of the driver.

[0029] Specifically, when any driver reports undervoltage during the current control cycle (i.e., the voltage across a certain LED driven by that driver is lower than the minimum voltage threshold required for normal operation, causing the LED to fail to light up or have insufficient brightness), a voltage boost command is sent to all power supplies. This causes each power supply to boost its output voltage upon receiving the voltage boost command, thereby increasing the voltage across the LED until none of the drivers report undervoltage.

[0030] Optionally, if any driver reports undervoltage during the current control cycle, a voltage boost command is sent to all power supplies until none of the drivers report undervoltage, including: Within the current control cycle, acquire the undervoltage signals of all drive channels fed back by each driver in all drive chains; If there is an undervoltage signal indicating undervoltage, then there is a driver that reports undervoltage; or if all undervoltage signals indicate no undervoltage, then none of the drivers report undervoltage. Send a voltage boost command to all power supplies so that each power supply can boost the voltage of the connected LEDs according to the voltage boost command; Return to the previous step and retrieve the undervoltage signal of all drive channels fed back by each driver in all drive chains, until all drivers no longer report undervoltage.

[0031] The undervoltage signal can be a signal used to indicate whether the power supply voltage of the corresponding drive channel of the driver is undervoltage. For example, if the power supply voltage of the drive channel is lower than the preset normal operating threshold, an undervoltage signal indicating undervoltage can be fed back to the controller. If the power supply voltage is within the preset normal operating threshold range, an undervoltage signal indicating no undervoltage can be fed back to the controller.

[0032] That is, within the current control cycle, the undervoltage signals of all drive channels fed back by each driver in all drive chains are acquired. If any drive channel reports an undervoltage signal, then a driver has reported undervoltage. A voltage boost command is sent to all power supplies, causing all power supplies to boost their output voltage according to the voltage boost command, thereby increasing the voltage across the connected LEDs. The process then returns to acquiring the undervoltage signals of all drive channels fed back by each driver in all drive chains until none of the drivers report undervoltage. Alternatively, if all undervoltage signals are positive, then none of the drivers report undervoltage, and no voltage boost processing is performed on the power supplies.

[0033] Step S202: Take any power supply that has not performed voltage reduction as the target power supply, send a voltage reduction command to the target power supply until any driver reports undervoltage, stop voltage reduction of the target power supply, and continue until all power supplies have been traversed.

[0034] The target power supply can refer to a power supply that has performed a voltage boosting operation according to the voltage boosting command but has not performed a voltage bucking operation. The voltage bucking command can refer to a control command sent to the power supply to reduce the output voltage.

[0035] Specifically, a power supply that has not performed voltage reduction is selected from all power supplies as the target power supply. A voltage reduction command is sent to the target power supply so that it reduces its output voltage upon receiving the command, thereby lowering the voltage across the connected LED chips. This continues until any connected driver reports undervoltage, at which point the voltage reduction operation stops. Then, a new power supply is selected from all power supplies that have not performed voltage reduction as the new target power supply, and its output voltage is reduced. This process is repeated until all power supplies have been traversed and a voltage reduction operation has been performed on each power supply.

[0036] Optionally, any power supply that has not performed voltage bucking is selected as the target power supply, and a voltage bucking command is sent to the target power supply until any driver reports an undervoltage, at which point the voltage bucking of the target power supply is stopped, including: Take any power supply that has not performed voltage reduction as the target power supply, send a voltage reduction command to the target power supply, so that the target power supply can reduce the voltage of the lamp beads connected to the target power supply according to the voltage reduction command; Return to the process of acquiring the undervoltage signal of all drive channels fed back by each driver in all drive chains, until any driver reports undervoltage, at which point the voltage reduction of the target power supply is stopped.

[0037] That is, select a power supply that has not performed voltage reduction from all power supplies as the target power supply, send a voltage reduction command to the target power supply, so that the target power supply reduces its own output voltage after receiving the voltage reduction command, thereby reducing the voltage across the LED connected to the target power supply, and return to the above process of obtaining the undervoltage signal of all drive channels fed back by each driver in all drive chains, until any driver feeds back undervoltage, and stop performing voltage reduction on the target power supply.

[0038] Optionally, after stopping the voltage reduction of the target power supply, the method further includes: Return to the execution and send a voltage boost command to all power supplies.

[0039] In other words, this embodiment of the application, upon receiving undervoltage feedback from any driver during the current control cycle, uses a voltage boost command to boost the output voltage of all power supplies to increase the voltage across the connected LED chips. This continues until the driver no longer reports undervoltage. After boosting, all power supplies are sequentially traversed, and their output voltages are de-boosted. While ensuring the normal operation of the LED chips, the output voltage of each power supply is gradually approached to its optimal operating voltage until the driver of the corresponding power supply reports undervoltage, at which point the de-boosting process is stopped. After de-boosting, the above-mentioned boosting process based on the voltage boost command is repeated. Through a closed-loop adjustment process of repeated overall boosting and successive de-boosting for optimization, adaptive adjustment of undervoltage in LED chips is achieved.

[0040] In this embodiment, by using a closed-loop control logic that first boosts the overall voltage to eliminate the undervoltage and then reduces the voltage of each LED chip to optimize performance when the driver sends an undervoltage signal, adaptive adjustment of the undervoltage of any LED chip is achieved, even when each driver chip is equipped with LEDs of different specifications, corresponds to multiple power supplies, and there is no need for a regular arrangement of LEDs or a complex mapping with the power supply. This reduces the difficulty of system hardware layout and software configuration.

[0041] See Figure 3 This is a flowchart illustrating a backlight voltage control method provided in Embodiment 3 of this application. Before sending a voltage boost command to all power supplies in step S201, or sending a voltage drop command to the target power supply in step S202, the backlight voltage control method includes the following steps: Step S301: Detect whether there is a dimming control command in the current control cycle.

[0042] Step S302: If there is no dimming control command in the current control cycle, execute the command to send a voltage boost command to all power supplies or a voltage buck command to the target power supply.

[0043] Among them, dimming control commands can refer to control commands used to adjust the brightness and on / off status of the LED beads.

[0044] That is, when any driver feedback undervoltage is received within the current control cycle, the system checks whether a dimming control command exists within the current control cycle. If no dimming control command is detected within the current control cycle, the system executes the step of sending a voltage boost command to all power supplies. Alternatively, after selecting any power supply that has not performed voltage reduction as the target power supply, the system checks whether a dimming control command exists within the current control cycle. If no dimming control command is detected within the current control cycle, the system executes the step of sending a voltage reduction command to the target power supply.

[0045] Optionally, after detecting whether a dimming control command exists within the current control cycle, the method further includes: If a dimming control command exists within the current control cycle, and the dimming control command is grayscale dimming, then determine the power supply and the first voltage control command corresponding to grayscale dimming. A first voltage control command is sent to the power supply corresponding to grayscale dimming, so that the power supply corresponding to grayscale dimming can control the voltage of the connected LEDs according to the first voltage control command.

[0046] Among them, grayscale dimming can refer to a dimming method that reduces the backlight brightness of the LED by adjusting the power supply voltage. The first voltage control command can be a control command sent to the power supply to adjust its output voltage to reduce the backlight brightness of the LED.

[0047] That is, if a dimming control command is detected within the current control cycle, the dimming control command is parsed. If the dimming control command is to adjust the backlight brightness of the LEDs, the power supply corresponding to grayscale dimming and the first voltage control command for adjusting the grayscale of the LEDs connected to the power supply are determined. The first voltage control command is sent to the power supply corresponding to grayscale dimming so that the power supply corresponding to grayscale dimming adjusts its output voltage according to the first voltage control command to adjust the backlight brightness of the connected LEDs.

[0048] Optionally, after detecting whether a dimming control command exists within the current control cycle, the method further includes: If a dimming control command exists within the current control cycle, and the dimming control command is to turn off dimming, then determine the power supply and second voltage control command corresponding to turning off dimming. A second voltage control command is sent to the power supply corresponding to the dimming switch, so that the power supply corresponding to the dimming switch can control the voltage of the connected LEDs according to the second voltage control command.

[0049] Among them, dimming can refer to a dimming method that turns off the lamp beads and stops them from emitting light by adjusting the power supply voltage, and the second voltage control command can refer to a control command sent by the power supply to adjust its output voltage to control the lamp beads to turn off.

[0050] That is, if a dimming control command is detected within the current control cycle, the dimming control command is parsed. If the dimming control command is to adjust the lamp beads to turn off or stop emitting light, the power supply corresponding to the dimming and the second voltage control command for dimming the lamp beads connected to the power supply are determined. The second voltage control command is sent to the power supply corresponding to the dimming, so that the power supply corresponding to the dimming adjusts its output voltage according to the second voltage control command to adjust the connected lamp beads to turn off or stop emitting light.

[0051] For example, see Figure 4 This is a schematic diagram of the overall process of a backlight voltage control method provided in Embodiment 3 of this application. Figure 4 As shown, all driver channels are equipped with three types of LEDs: red, green, and blue. During initialization, the power supply to be adjusted is the power supply corresponding to any color LED, the undervoltage flag is set to 0, and dimming parameters are set for red LEDs, green LEDs, and blue LEDs respectively. The overall flow of this backlight voltage control method can be summarized as follows: 1. Data Acquisition: Within the current control cycle, the data status of red / green / blue lights output from the DOS terminal of the drive chain is acquired in real time. Based on the acquired data status of red / green / blue lights, the dimming parameters of red light, green light, and blue light are assigned values ​​respectively.

[0052] 2. Boost control: Obtain undervoltage signals from all drive channels fed back by each driver in all drive chains. If an undervoltage signal exists, and the brightness data of the red, green, and blue lights in at least one zone is relatively large (indicating that the dimming parameters are all on and there are currently no dimming control commands for the red, green, and blue lights), assign the dimming parameters of the red, green, and blue lights to 3, and the undervoltage flag to 0. Adjust according to the undervoltage situation, and send voltage boost commands to all power supplies so that each power supply boosts the power supply to the connected red, green, and blue lights according to the voltage boost commands, until all drivers no longer report undervoltage. Optionally, before sending a voltage boost command to all power supplies, if the full-screen brightness data of the red, green, and / or blue lights is a low grayscale value (dimening parameter is dark), then the dimming parameter of the corresponding red, green, and / or blue lights is assigned a value of 1, adjusted according to grayscale dimming, and a first voltage control command is sent to the power supply corresponding to the corresponding red, green, and / or blue lights to control the voltage of the connected red, green, and / or blue lights. Alternatively, if the full-screen brightness data of the red, green, and / or blue lights is 0 (dimening parameter is off), then the dimming parameter of the corresponding red, green, and / or blue lights is assigned a value of 2, adjusted according to off dimming, and a second voltage control command is sent to the power supply corresponding to the corresponding red, green, and / or blue lights to control the voltage of the connected red, green, and / or blue lights.

[0053] 3. Voltage reduction control: 3.1. After the above boost control, return to the step of real-time acquisition of the data status of the red / green / blue lights output from the DOS terminal of the drive chain. Since none of the drivers reported undervoltage after the boost, the undervoltage flag is 0. Further step-down processing is then performed, setting the undervoltage flag to 1, initializing the power supply to be adjusted to the target power supply (such as the power supply connected to the red light), setting NUM to 0, and checking whether the power supply connected to the red light is not adjusted (whether there is a dimming control command). If it is adjusted (no dimming control command), then the power supply connected to the red light is adjusted, setting the red light dimming parameter to 4, and adjusting according to no undervoltage. A voltage reduction command is sent to the power supply connected to the red light to reduce the voltage supply to the connected red light until the driver reports undervoltage, at which point the voltage reduction of the power supply connected to the red light is stopped. Return to the step of obtaining the data status of red / green / blue lights output from the DOS terminal of the drive chain in real time. The undervoltage flag is 1. Continue to perform voltage reduction processing. Set the power supply to be adjusted to the power supply connected to the next color light (such as the power supply connected to the green light). Set the power supply connected to the green light as the target power supply. Set NUM to 0. Execute the step of checking whether the power supply connected to the green light is not to be adjusted. Continue until all power supplies are traversed and the voltage of all power supplies is reduced in turn. Alternatively, after checking whether the power supply connected to the red light is not adjusted in section 3.1 above, it may also include: 3.2. If the power supply connected to the red light is not adjusted (there is a dimming control command), the power supply connected to the next color green light is set as the power supply to be adjusted, NUM is set to 1, and the step of checking whether the power supply connected to the green light is not to be adjusted is executed until all power supplies are traversed, and the voltage of all power supplies is reduced in turn. Alternatively, until all power supplies are traversed and NUM is set to 3, then wait, adjust according to the dimming control command corresponding to the power supply to be adjusted, and then perform the voltage reduction process.

[0054] Optionally, without adjusting the power supply to be adjusted (the power supply connected to the red light, the power supply connected to the green light, or the power supply connected to the blue light has a dimming control command), if the dimming control command is grayscale dimming, then the dimming parameter of the lamp connected to the power supply to be adjusted is assigned a value of 1, and the adjustment is performed according to grayscale dimming. A first voltage control command is sent to the power supply to be adjusted to control the voltage of the connected red, green, or blue lamp. Alternatively, if the dimming control command is off dimming, then the dimming parameter of the lamp connected to the power supply to be adjusted is assigned a value of 2, and the adjustment is performed according to off dimming. A second voltage control command is sent to the power supply to be adjusted to control the voltage of the connected red, green, or blue lamp.

[0055] In this embodiment, before sending a voltage boost or voltage buck command, it detects whether a dimming control command exists in the current control cycle. If no dimming command exists, the voltage boost / buck operation is performed. If a dimming command exists, the corresponding voltage control command is sent according to the dimming type (grayscale dimming or off dimming). This avoids conflicts between the boost / buck operation and the dimming operation, which could lead to abnormal operation of the LED (such as brightness adjustment failure or untimely extinguishing). By using different dimming types and corresponding voltage control commands for dimming, the accuracy and timeliness of LED brightness adjustment and on / off control are improved.

[0056] See Figure 5 This is a schematic diagram of a backlight voltage control device provided in Embodiment 4 of this application. The backlight voltage control device 50 is applied to the controller of a display system. The display system also includes at least one drive chain and at least two power supplies connected to the controller. M drivers are connected in series on the drive chain, and each driver has at least two drive channels. Different specifications of LEDs are installed on different channels. LEDs of the same specification on all drivers in the drive chain are connected to the same power supply. The boost control module 501 is used to send a voltage boost command to all power supplies when it receives undervoltage feedback from any driver during the current control cycle, until all drivers no longer report undervoltage. The step-down control module 502 is used to take any power supply that has not performed voltage step-down as the target power supply, send a voltage step-down command to the target power supply, and stop the voltage step-down of the target power supply when any driver reports undervoltage, until all power supplies have been traversed.

[0057] Optionally, the boost control module 501 includes: The signal acquisition unit is used to acquire the undervoltage signals of all drive channels fed back by each driver on all drive chains within the current control cycle; The first judgment unit is used to determine if there is an undervoltage signal, then there is a driver that reports undervoltage, or if all undervoltage signals are not undervoltage, then none of the drivers report undervoltage. The boost regulation unit is used to send voltage boost commands to all power supplies so that each power supply can boost the voltage of the connected LED chips according to the voltage boost commands. The first loop unit is used to return the undervoltage signal of all drive channels fed back by each driver on all drive chains until all drivers no longer feed back undervoltage.

[0058] Optionally, the buck control module 502 includes: The step-down regulating unit is used to take any power supply that has not performed voltage reduction as the target power supply, and send the voltage reduction command to the target power supply so that the target power supply can reduce the voltage of the lamp beads connected to the target power supply according to the voltage reduction command. The second loop unit is used to return to the process of obtaining the undervoltage signal of all drive channels fed back by each driver on all drive chains, until any driver feeds back undervoltage, and then stop the voltage reduction of the target power supply.

[0059] Optionally, the backlight voltage control device further includes: The detection module is used to detect whether a dimming control command exists within the current control cycle; The second judgment module is used to execute the sending of voltage boost command to all power supplies or the sending of voltage buck command to the target power supply when there is no dimming control command in the current control cycle.

[0060] Optionally, the backlight voltage control device further includes: A grayscale dimming module is used to determine the power supply and first voltage control command corresponding to grayscale dimming when a dimming control command exists within the current control cycle and the dimming control command is grayscale dimming. The grayscale adjustment module is used to send the first voltage control command to the power supply corresponding to the grayscale dimming, so that the power supply corresponding to the grayscale dimming can control the voltage of the connected LED beads according to the first voltage control command.

[0061] Optionally, the backlight voltage control device further includes: The dimming control module is used to determine the power supply and second voltage control command corresponding to dimming control if dimming control command is dimming control when dimming control command exists in the current control cycle. The dimming adjustment module is used to send the second voltage control command to the power supply corresponding to the dimming dimming, so that the power supply corresponding to the dimming dimming can control the voltage of the connected lamp beads according to the second voltage control command.

[0062] Optionally, the backlight voltage control device further includes: The third loop module is used to return to the execution of the command to send voltage boost to all power supplies.

[0063] It should be noted that the information interaction and execution process between the above modules are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, which will not be repeated here.

[0064] See Figure 6 The diagram below is a structural schematic of a computer device provided in Embodiment 5 of this application. Please refer to it. Figure 6 The computer device 60 includes a memory 601 and a processor 602. The memory 601 is used to store computer programs, and the processor 602 is used to execute the programs stored in the memory 601 to implement the backlight voltage control method described in any embodiment of this application.

[0065] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the backlight voltage control method described in any embodiment of this application.

[0066] In this application, "multiple" refers to two or more.

[0067] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0068] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0069] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0070] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A backlight voltage control method, characterized in that, The backlight voltage control method is applied to the controller of a display system. The display system further includes at least one drive chain and at least two power supplies connected to the controller. The drive chain has M drivers connected in series, each driver having at least two drive channels. Different channels have LEDs of different specifications. All drivers in the drive chain with LEDs of the same specification are connected to the same power supply. M is a positive integer, including: If any driver reports undervoltage during the current control cycle, a voltage boost command is sent to all power supplies until none of the drivers report undervoltage. Take any power supply that has not performed voltage reduction as the target power supply, send a voltage reduction command to the target power supply until any driver reports undervoltage, then stop voltage reduction of the target power supply, and continue until all power supplies have been traversed.

2. The backlight voltage control method according to claim 1, characterized in that, The step of sending a voltage boost command to all power supplies when receiving undervoltage feedback from any driver during the current control cycle, until all drivers no longer report undervoltage, includes: Within the current control cycle, acquire the undervoltage signals of all drive channels fed back by each driver on all drive chains; If there is an undervoltage signal indicating undervoltage, then there is a driver that reports undervoltage; or if all undervoltage signals indicate no undervoltage, then none of the drivers report undervoltage. Send a voltage boost command to all power supplies so that each power supply can boost the voltage of the connected LEDs according to the voltage boost command; Return to the previous step and obtain the undervoltage signal of all drive channels fed back by each driver on all drive chains until all drivers no longer report undervoltage.

3. The backlight voltage control method according to claim 2, characterized in that, The step of taking any power supply that has not performed voltage reduction as the target power supply, sending a voltage reduction command to the target power supply, and stopping voltage reduction of the target power supply when any driver reports undervoltage includes: Take any power supply that has not performed voltage reduction as the target power supply, and send the voltage reduction command to the target power supply so that the target power supply can reduce the voltage of the lamp beads connected to the target power supply according to the voltage reduction command; Return to the process of obtaining the undervoltage signal of all drive channels fed back by each driver on all drive chains, until any driver reports undervoltage, then stop the voltage reduction of the target power supply.

4. The backlight voltage control method according to claim 1, characterized in that, Before sending a voltage boost command to all power supplies or sending a voltage buck command to the target power supply, the method further includes: Detect whether a dimming control command exists within the current control cycle; If there is no dimming control command in the current control cycle, execute the command to send a voltage boost command to all power supplies or the command to send a voltage drop command to the target power supply.

5. The backlight voltage control method according to claim 4, characterized in that, After detecting whether a dimming control command exists within the current control cycle, the method further includes: When a dimming control instruction exists within the current control cycle, if the dimming control instruction is grayscale dimming, then the power supply and the first voltage control instruction corresponding to the grayscale dimming are determined. The first voltage control command is sent to the power supply corresponding to the grayscale dimming, so that the power supply corresponding to the grayscale dimming performs voltage control on the connected LED beads according to the first voltage control command.

6. The backlight voltage control method according to claim 4, characterized in that, After detecting whether a dimming control command exists within the current control cycle, the method further includes: When a dimming control command exists within the current control cycle, if the dimming control command is to turn off dimming, then the power supply and second voltage control command corresponding to the turn-off dimming are determined. The second voltage control command is sent to the power supply corresponding to the dimming switch, so that the power supply corresponding to the dimming switch can control the voltage of the connected LEDs according to the second voltage control command.

7. The backlight voltage control method according to any one of claims 1 to 6, characterized in that, After stopping the voltage reduction of the target power supply, the method further includes: Return to the previous step and execute the command to send a voltage boost to all power supplies.

8. A display system, characterized in that, The display system includes: A controller, at least one drive chain connected to the controller, and at least two power supplies; The drive chain is equipped with M drivers connected in series. Each driver is equipped with at least two drive channels. Different specifications of LED beads are installed on different channels. All LED beads of the same specification on all drivers in the drive chain are connected to the same power supply. M is an integer greater than zero. The controller is used to perform the backlight voltage control method as described in any one of claims 1 to 6.

9. A computer device, characterized in that, The computer device includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the backlight voltage control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the backlight voltage control method as described in any one of claims 1 to 7.

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