Display devices and their backlight control methods

Abstract

This application provides a display device and its backlight control method, including: a backlight assembly, a display panel, and a controller; the backlight assembly includes multiple light-emitting unit groups, each light-emitting unit group including a driver chip and at least one LED; the controller is configured to: acquire backlight data corresponding to the current backlight assembly; determine the basic output current value of the driver chip in each light-emitting unit group based on the backlight data; if the temperature value of the current driver chip does not reach the upper limit of the driver chip's temperature range, then the basic output current value is used as the target output current value of the current driver chip; otherwise, if the actual output current value of the driver chip exceeds the current reference value, then closed-loop control processing is performed; the driver chip is controlled to output current corresponding to the target output current value to at least one LED, so that the light-emitting unit group provides backlight. This solution can avoid image flickering and improve the accuracy and reliability of backlight control.

Description

[0001] This application claims priority to Chinese Patent Application No. 202310280055.1, filed on March 21, 2023, entitled "Driver Chip, Driver Circuit and Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] Some embodiments of this application relate to display technology. More specifically, they relate to a display device and a backlight control method thereof. Background Technology

[0003] Display devices are widely used in people's production and daily life. To improve the contrast of display devices, some liquid crystal display devices, such as MiniLED or MicroLED, use local dimming (LDM) technology, which divides the entire backlight into multiple independent areas, each of which can adjust its brightness independently, thereby achieving control over different areas.

[0004] In practical applications, backlight integration is becoming increasingly sophisticated to save costs. However, with the same current, higher integration leads to higher temperatures for the internal components in each area, and excessively high temperatures can negatively impact component lifespan.

[0005] In related technologies, setting a temperature threshold for components and controlling the output current to decrease to a lower value when the temperature reaches the threshold can cause the image displayed on the display device to flicker, resulting in low accuracy and reliability of backlight control. Summary of the Invention

[0006] Some embodiments of this application provide a display device and a backlight control method thereof, which aim to solve the technical problem of low accuracy and reliability of backlight control.

[0007] In a first aspect, some embodiments of this application provide a display device, the display device comprising: a backlight assembly, the backlight assembly including a plurality of light-emitting unit groups, the light-emitting unit group including a driver chip and at least one LED; a display panel configured to display an image based on display data and backlight provided by the backlight assembly; and a controller coupled to the display panel and the backlight assembly, the controller being configured to: acquire backlight data corresponding to the current backlight assembly; determine a basic output current value of the driver chip in each light-emitting unit group based on the backlight data; if the temperature value of the current driver chip does not reach the upper limit of the temperature range of the driver chip, then take the basic output current value as the target output current value of the current driver chip; otherwise, if the actual output current value of the driver chip exceeds a current reference value, then perform closed-loop control processing; the closed-loop control processing includes: determining a current reduction rate based on the current temperature value of the current driver chip; determining a target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip; and controlling the driver chip to output a current corresponding to the target output current value to the at least one LED, so that the light-emitting unit group provides backlight.

[0008] In some embodiments, after acquiring the backlight data corresponding to the current backlight component, the controller is further configured to: determine the duty cycle corresponding to each light-emitting unit group based on the backlight data; when controlling the driver chip to output the current corresponding to the target output current value to the at least one LED, the controller is configured to: determine the product of the target output current value and the duty cycle corresponding to the light-emitting unit group; and send the product result to the driver chip so that the driver chip outputs the current corresponding to the target output current value to the at least one LED during the light-emitting period corresponding to the light-emitting unit group.

[0009] In some embodiments, after determining the duty cycle corresponding to each light-emitting unit group based on the backlight data, the controller is further configured to: determine whether the basic output current value is above the lower limit of the high brightness current range; if so, adjust the duty cycle corresponding to the light-emitting unit group based on the current temperature value of the driving chip and the basic output current value.

[0010] In some embodiments, before acquiring the backlight data corresponding to the current backlight component, the controller is further configured to: acquire the upper limit of the junction temperature range of the driver chip in each light-emitting unit group, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device; and determine the upper limit of the temperature range of the driver chip based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device.

[0011] In some embodiments, before acquiring the backlight data corresponding to the current backlight component, the controller is further configured to: acquire the external ambient temperature of the backlight unit group; after determining the upper limit of the temperature range of the driver chip based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device, the controller is further configured to: adjust the upper limit of the temperature range of the driver chip based on the external ambient temperature of the backlight unit group.

[0012] In some embodiments, after determining the current reduction rate based on the current temperature value of the driver chip, the controller is further configured to: determine the ratio of the base output current value of the driver chip to the base output current value of an adjacent driver chip to obtain a current adjustment ratio; wherein, the adjacent driver chip is a driver chip in a light-emitting unit group adjacent to the light-emitting unit group in which the driver chip is located; adjust the current reduction rate based on the current adjustment ratio to obtain an adjusted current reduction rate; when determining the target output current value of the current driver chip based on the current reduction rate and the current actual output current value of the driver chip, the controller is configured to: determine the target output current value of the current driver chip based on the adjusted current reduction rate and the current actual output current value of the driver chip.

[0013] In some embodiments, the display device further includes a closed-loop control speed register; when determining the current reduction rate based on the current temperature value of the current driving chip, the controller is configured to: obtain the closed-loop control speed corresponding to the current temperature value from the closed-loop control speed register based on the current temperature value of the current driving chip; and determine the current reduction rate based on the closed-loop control speed.

[0014] Secondly, some embodiments of this application provide a backlight control method for a display device. The display device includes a display panel, a backlight assembly, and a controller. The backlight assembly includes multiple light-emitting unit groups, each light-emitting unit group including a driver chip and at least one LED. The method includes: the controller acquiring backlight data corresponding to the current backlight assembly; the controller determining a basic output current value of the driver chip in each light-emitting unit group based on the backlight data; if the current temperature value of the driver chip does not reach the upper limit of the temperature range of the driver chip, the controller uses the basic output current value as the target output current value of the current driver chip; otherwise, if the actual output current value of the driver chip exceeds a current reference value, closed-loop control processing is performed; the closed-loop control processing includes: determining a current reduction rate based on the current temperature value of the driver chip; determining a target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip; and the controller controlling the driver chip to output a current corresponding to the target output current value to the at least one LED, so that the light-emitting unit group provides backlight.

[0015] In some embodiments, after the controller acquires the backlight data corresponding to the current backlight component, the method further includes: the controller determining the duty cycle corresponding to each light-emitting unit group based on the backlight data; the controller controlling the driver chip to output the current corresponding to the target output current value to the at least one LED, including: the controller determining the product of the target output current value and the duty cycle corresponding to the light-emitting unit group; the controller sending the product result to the driver chip, so that the driver chip outputs the current corresponding to the target output current value to the at least one LED during the light-emitting period corresponding to the light-emitting unit group.

[0016] In some embodiments, after the controller determines the duty cycle corresponding to each light-emitting unit group based on the backlight data, the method further includes: the controller determining whether the basic output current value is above the lower limit of the high brightness current range; if so, the controller adjusts the duty cycle corresponding to the light-emitting unit group based on the current temperature value of the driving chip and the basic output current value.

[0017] In some embodiments, before the controller acquires the backlight data corresponding to the current backlight component, the method further includes: the controller acquiring the upper limit of the junction temperature range of the driver chip in each light-emitting unit group, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device; the controller determining the upper limit of the temperature range of the driver chip based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device.

[0018] In some embodiments, before the controller acquires the backlight data corresponding to the current backlight component, the method further includes: the controller acquiring the external ambient temperature of the backlight unit group; after the controller determines the upper limit of the temperature range of the driver chip based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device, the method further includes: the controller adjusting the upper limit of the temperature range of the driver chip based on the external ambient temperature of the backlight unit group.

[0019] In some embodiments, after the controller determines the current reduction rate based on the current temperature value of the driver chip, the method further includes: the controller determining a current adjustment ratio by comparing the base output current value of the driver chip with the base output current value of an adjacent driver chip; wherein the adjacent driver chip is a driver chip in a light-emitting unit group adjacent to the light-emitting unit group in which the driver chip is located; the controller adjusting the current reduction rate based on the current adjustment ratio to obtain an adjusted current reduction rate; the controller determining a target output current value of the current driver chip based on the current reduction rate and the current actual output current value of the driver chip, specifically including: the controller determining the target output current value of the current driver chip based on the adjusted current reduction rate and the current actual output current value of the driver chip.

[0020] In some embodiments, the display device further includes a closed-loop control speed register; the controller determines the current reduction rate based on the current temperature value of the driving chip, including: the controller obtains the closed-loop control speed corresponding to the current temperature value from the closed-loop control speed register based on the current temperature value of the driving chip; the controller obtains the current reduction rate based on the closed-loop control speed.

[0021] In some embodiments of this application, a display device and its backlight control method are provided, in which backlight data corresponding to the current backlight component is obtained; based on the backlight data, the basic output current value of the driver chip in each light-emitting unit group is determined; if the temperature value of the current driver chip does not reach the upper limit of the temperature range of the driver chip, the basic output current value is used as the target output current value of the current driver chip; otherwise, if the actual output current value of the driver chip exceeds the current reference value, closed-loop control processing is performed; the driver chip is controlled to output current corresponding to the target output current value to at least one LED, so that the light-emitting unit group provides backlight. In this scheme, if the temperature value of the current driver chip reaches the upper limit of the temperature range of the driver chip, the current reduction rate is determined based on the temperature value of the current driver chip, and the target output current value of the current driver chip is determined based on the current reduction rate and the actual output current value of the current driver chip. That is, the output current value of the driver chip is controlled in a closed loop by the temperature value of the driver chip, ensuring that the output current value of the driver chip decreases slowly and stabilizes near the current reference value. This can reduce the temperature of the driver chip while ensuring stable display of the current display image, thereby avoiding image flicker and improving the accuracy and reliability of backlight control. Attached Figure Description

[0022] To more clearly illustrate the implementation methods in some embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram illustrating an operational scenario between a display device and a control unit, based on some embodiments.

[0024] Figure 2 This is a schematic diagram of the structure of a display device according to some embodiments;

[0025] Figure 3 These are schematic diagrams of the structure of a display device according to some embodiments;

[0026] Figure 4 This is a schematic diagram of the structure of a display device according to other embodiments;

[0027] Figure 5 This is a circuit diagram of a backlight assembly in some embodiments;

[0028] Figure 6 This is a schematic diagram of a temperature threshold control method in some embodiments;

[0029] Figure 7 A schematic diagram illustrating the temperature change of the continuous high-brightness current in some embodiments;

[0030] Figure 8 This is a schematic diagram illustrating the changes in current and temperature during small window brightness variations in some embodiments;

[0031] Figure 9 This is a schematic diagram illustrating the current-temperature changes in some embodiments. Detailed Implementation

[0032] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0033] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0034] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0035] The display device provided in this application can have various implementation forms, such as a smart TV, a laser projection device, a monitor, an electronic bulletin board, an electronic table, etc. Figure 1 and Figure 2 This is one specific embodiment of the display device of this application.

[0036] Figure 1 This is a schematic diagram illustrating the operational scenario between the display device and the control unit according to the embodiment. Figure 1 As shown, the user can operate the display device 200 through the smart device 300 or the control device 100.

[0037] In some embodiments, the control device 100 may be a remote control. Communication between the remote control and the display device includes infrared protocol communication, Bluetooth protocol communication, and other short-range communication methods, controlling the display device 200 wirelessly or via wired means. Users can control the display device 200 by inputting user commands through buttons on the remote control, voice input, control panel input, etc.

[0038] In some embodiments, a smart device 300 (such as a mobile terminal, tablet computer, computer, laptop computer, etc.) may also be used to control the display device 200. For example, an application running on the smart device may be used to control the display device 200.

[0039] In some embodiments, the display device may receive instructions not through the aforementioned smart devices or control devices, but through touch or gestures.

[0040] In some embodiments, the display device 200 can also be controlled in ways other than the control device 100 and the smart device 300. For example, it can be controlled by directly receiving the user's voice commands through a module configured inside the display device 200 for acquiring voice commands, or it can be controlled by receiving the user's voice commands through a voice control device set outside the display device 200.

[0041] In some embodiments, the display device 200 also communicates with the server 400. The display device 200 may communicate via a local area network (LAN), wireless local area network (WLAN), and other networks. The server 400 may provide various content and interactive features to the display device 200. The server 400 may be a cluster or multiple clusters, and may include one or more types of servers.

[0042] Figure 2 This is a schematic diagram of the structure of a display device according to some embodiments.

[0043] In some embodiments, the display device 200 includes a controller 250, which is configured to receive a video input signal or an image input signal, obtain backlight data and display data from the video input signal or the image input signal, and perform format conversion, timing control and other processing on the backlight data and display data before outputting them.

[0044] In some embodiments, the controller 250 may include a system-on-chip (SOC) controller configured to obtain video input signals or image input signals (hereinafter referred to as input signals) from an external input port or a network port, and perform operations such as format conversion, data processing, and image rendering on the input signals.

[0045] In some embodiments, controller 250 may include a timing controller (Tcon) configured to perform timing control output on the data it acquires.

[0046] In some embodiments, the timing controller is also configured to perform data format conversion.

[0047] In some embodiments, controller 250 may include a backlight controller (Bcon) or a dimming controller (DCON), configured to obtain processing data associated with backlight data, generate and output driving data from the processing data.

[0048] In some embodiments, the display device 200 includes a display panel 10 coupled to a controller 250, the display panel 10 including liquid crystal molecules configured to deflect based on received processed display data.

[0049] In some embodiments, the display device 200 includes a backlight assembly 20, the backlight assembly 20 and a controller 250 are coupled, and the backlight assembly 20 is configured to emit light based on driving data. The display panel 10 can display an image based on the backlight provided by the backlight assembly 20.

[0050] In some embodiments, the backlight assembly 20 includes a driving circuit 201 coupled to a controller 250. The driving circuit 201 includes a plurality of driving chips 202 configured to generate driving signals based on driving data.

[0051] In some embodiments, the backlight assembly 20 further includes a lamp board 30, which includes an array of lamp beads 301. At least one lamp bead is electrically connected to form a light-emitting unit group. The light-emitting unit group is electrically connected to a driving end of the driving chip 202 and is configured to emit light based on a driving signal.

[0052] In some embodiments, in the light-emitting unit group, at least one LED bead is connected in series to form a light string;

[0053] In other embodiments, at least one LED chip is connected in parallel in the light-emitting unit group;

[0054] In other embodiments, in the light-emitting unit group, at least one LED bead is connected in series to form a light string, and at least one light string is connected in parallel.

[0055] Among them, the light string is a light string composed of light beads connected from left to right or from right to left, or it can be a light string composed from top to bottom or bottom to top, or it can be a light string composed of light beads connected in a preset order (e.g., rotation, bending, etc.).

[0056] The LEDs can be composed of MiniLED, MicroLED, WLED, RGB-LED, GB-rLED or QLED (quantum dot).

[0057] In one embodiment, the display device 200 includes a power supply circuit 13, which is coupled to a controller 250, a backlight assembly, and a display panel 10. The power supply circuit 13 is configured to provide corresponding power signals to the controller 250, the display panel 10, and / or the backlight assembly 10.

[0058] In some embodiments, the power supply terminals of the power supply circuit 13 and each light-emitting unit group in the backlight assembly 20 are coupled and configured to provide a backlight power supply signal VLED so that the light-emitting unit group emits light when it receives the backlight power supply signal VLED and the driving signal provided by the driver chip 202.

[0059] In some embodiments, the driver chip 202 samples the supply voltage of the light-emitting unit group to determine the supply state of the light-emitting unit group, which includes an undervoltage state or an overvoltage state. The supply state is fed back to the controller 250, so that the controller 250 provides a final feedback signal to the power supply circuit 13 based on the feedback signal. The power supply circuit 13 adjusts the supply voltage based on the final feedback signal.

[0060] In some embodiments, the driver chip 202 transmits feedback signals through the wires between its data output terminal Dout and the controller 250.

[0061] In other embodiments, the driver chip 202 uses its drive data transmission lines to transmit the feedback signal in reverse to the controller 250. In some embodiments, the display 260 includes a display panel 10 and a backlight assembly 20. For example, Figure 3 These are schematic diagrams of the structure of a display device according to some embodiments, such as... Figure 3 As shown, the display device includes a controller 250, a display panel 10, and a backlight assembly 20. The controller 250 may include a system-on-chip (SOC), a timing controller (Tcon), and a backlight controller (Bcon). The controller receives video input signals and performs format conversion, timing control, and other processing on the backlight data and display data. It then sends the processed backlight data to the backlight assembly 20 and the processed display data to the display panel.

[0062] Figure 4 This is a schematic diagram of the structure of a display device according to other embodiments. In some embodiments, the display panel 10 includes liquid crystal molecules that are deflected based on received processed display data and display an image based on backlight provided by a backlight assembly.

[0063] In some embodiments, the backlight assembly includes: a diaphragm;

[0064] In some embodiments, the backlight assembly includes a diffuser plate, wherein the backlight emitted by the lamp panel is provided to the display panel through a structure such as the diffuser plate, and the structure such as the diffuser plate is configured to homogenize the brightness and angle of the light, so that the brightness distribution of the entire display panel is more uniform.

[0065] In some embodiments, the backlight assembly includes: a bracket configured to support a diffuser plate and a lamp plate;

[0066] In some embodiments, the backlight assembly includes: a reflective sheet;

[0067] In some embodiments, the backlight assembly includes: a lamp panel configured to provide backlight;

[0068] In some embodiments, the backlight assembly includes: a backplate configured to provide a supporting substrate;

[0069] The backlight panel is configured to include an array of micron-sized LEDs and corresponding driver chips. These LEDs form multiple zones, and the driver chip in each zone receives processed backlight data from the backlight controller. Based on the processed backlight data, it drives the corresponding LED to emit light, thereby achieving local backlight control of the backlight assembly, i.e., local backlight adjustment. This enables more precise regional light control, resulting in more uniform and harmonious screen brightness. In some embodiments, for display devices with sound generation capabilities, the backlight assembly includes a honeycomb panel and a vibrator.

[0070] The following is a detailed description using a MiniLED display device as an example. In some embodiments, the mini display device is formed by splicing together multiple lamp boards. Each lamp board includes multiple light-emitting areas, and each light-emitting area (also called a partition) includes multiple arrayed micron-sized LED beads and one or more corresponding driver chips. The driver chip of each partition receives the processed backlight data sent by Bcon and drives the corresponding LED beads to emit light based on the processed backlight data, thereby realizing local backlight control of the backlight component, that is, realizing local dimming. This enables more precise regional light control and makes the screen brightness more uniform and harmonious.

[0071] Figure 5 Here are circuit diagrams of backlight components in some embodiments, such as Figure 5 As shown, in some embodiments, the backlight assembly includes a plurality of light-emitting unit groups 200, each of which includes a driver chip 202.

[0072] In some embodiments, the light-emitting unit group includes at least one lamp bead 301.

[0073] In some embodiments, the driver chip 202 has a data input terminal, a power supply terminal, and multiple driver terminals. The data input terminal is coupled to the controller 250 and receives drive data DIN. The power supply terminal is connected to the power supply circuit and receives a power signal VCC. The multiple driver terminals are correspondingly connected to the negative terminals of multiple LED strings, and the positive terminals of the multiple LED strings are connected to the power supply circuit. The positive terminals of the LED strings are connected to the power supply circuit and receive a power signal VLED. The driver chip is configured to generate and output drive signals from the driver terminals based on the drive data, so that the corresponding connected LED strings emit light based on the drive signals.

[0074] In some embodiments, the driver chip 202 controls the on / off state of surrounding LEDs. In practical applications, to save costs, the integration density of backlights is increasing, and the spacing between the driver chip and the LED beads 301 is decreasing. When the driver chip outputs the same amount of current to the LED beads 301, the temperature of both the driver chip and the LED beads 301 will be higher in backlights with higher integration density. Excessive temperature will affect the lifespan of the driver chip. Similarly, when the operating temperature of the LED beads 301 is too high, it will lead to problems such as changes in the emission wavelength of the LED beads 301, decreased luminous efficiency, and reduced lifespan. In practical applications, the higher the current value output by the driver chip to the LED beads 301, the higher the temperature of both the driver chip and the LED beads 301.

[0075] Figure 6 These are schematic diagrams of temperature threshold control methods in some embodiments, such as... Figure 6 As shown, before time t1, the temperature of the driver chip and LEDs gradually increases with the increase of current. At times t1 and t2, the temperature of the driver chip reaches the temperature threshold T1, immediately shutting off the driver chip or reducing its output current to a lower value. This sudden change in current causes noticeable flickering in the displayed image. After times t1 and t2, the current decreases, and the temperature of the driver chip decreases. When the temperature of the driver chip drops to T2, it can output driving current to the LEDs according to the current display requirements of the display device.

[0076] It is understandable that setting a temperature threshold for the driver chip, and immediately shutting down the driver chip or reducing its output current to a low value when the temperature of the driver chip reaches the temperature threshold, will cause the image displayed on the display device to flicker, and the accuracy and reliability of the backlight control will be low.

[0077] Therefore, some embodiments of this application provide a display device and its backlight control method. If the current temperature of the driver chip reaches the upper limit of the driver chip's temperature range, the current reduction rate is determined based on the current temperature of the driver chip. Based on the current reduction rate and the actual output current value of the driver chip, the target output current value of the driver chip is determined. That is, closed-loop control of the driver chip's output current value is achieved through the driver chip's temperature value, ensuring that the driver chip's output current value decreases slowly and stabilizes near the current reference value. This reduces the temperature of the driver chip while ensuring stable display of the current image, thereby avoiding image flicker and improving the accuracy and reliability of backlight control.

[0078] The technical solutions of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0079] In practical applications, LED chips are configured to provide backlighting for the display panel, enabling it to display images. Different images have different grayscale levels for each pixel, requiring precise control of the brightness of the LEDs in each light-emitting unit group. It can be understood that the brightness of an LED is positively correlated with the current flowing through it; that is, the brightness of an LED is directly proportional to the current output by the driver chip. The higher the current flowing through the LED, the brighter it is. Specifically, the controller controls the output of different currents from the driver chip in the light-emitting unit group to the LEDs, thereby controlling the brightness of the LEDs and thus the grayscale of each pixel.

[0080] In some embodiments, the controller acquires backlight data corresponding to the current backlight component. For example, the controller receives a backlight video input signal, and based on the received video input signal, the controller obtains the backlight data corresponding to the current backlight component and the display data corresponding to the display panel. The controller can perform processing such as format conversion and timing control on the backlight data and display data.

[0081] In practical applications, the controller can determine the backlight data corresponding to each light-emitting unit group based on the backlight data corresponding to the current backlight component. For example, the backlight data corresponding to the light-emitting unit group includes the brightness value of the LEDs in the light-emitting unit group, or parameters characterizing the brightness of the LEDs. Correspondingly, in some embodiments, the controller determines the basic output current value of the driver chip in each light-emitting unit group based on the backlight data. Specifically, the controller obtains the backlight data corresponding to each light-emitting unit group based on the backlight data corresponding to the backlight component; the controller determines the brightness value of the LEDs in each light-emitting unit group based on the backlight data corresponding to each light-emitting unit group; and the controller calculates the basic output current value of the driver chip based on the brightness value of the LEDs in the light-emitting unit group.

[0082] Based on the above explanation, the basic output current value refers to the output current value of the driver chip calculated by the controller based on the backlight data. In practice, the distance between the driver chip and the LED chips is relatively small. If the current temperature of the driver chip reaches the upper limit of its temperature range, it could be due to a high temperature of the driver chip itself or a high temperature of the LED chips. A high temperature of the driver chip may affect its lifespan, and a high temperature of the LED chips may affect their lifespan and the stability of their light emission.

[0083] In some embodiments, it is understood that closed-loop control based on the temperature value of the driver chip, dynamically adjusting the output current value of the driver chip to reduce its temperature, can ensure the reliability and stability of the backlight assembly. In some embodiments, the controller determines whether the current temperature value of the driver chip has reached the upper limit of its temperature range. For example, a temperature sensor is installed on the driver chip, which collects the temperature value of the driver chip in real time and sends it to the controller, which then determines whether the current temperature value of the driver chip has reached the upper limit of its temperature range.

[0084] In some embodiments, if the current temperature of the driver chip does not reach the upper limit of its temperature range, it indicates that the current temperature of the driver chip is low. Therefore, the controller uses the base output current value as the target output current value for the current driver chip. Conversely, in some embodiments, if the current temperature of the driver chip reaches the upper limit of its temperature range, it indicates that the current temperature of the driver chip is high. Therefore, the controller performs closed-loop control processing to reduce the output current value of the driver chip.

[0085] Furthermore, to meet the display requirements of the display device, the output current value of the driver chip should not be less than the current reference value. In some embodiments, the controller obtains the actual output current value of the driver chip and the temperature value of the driver chip. When the temperature value of the driver chip reaches the upper limit of the temperature range of the driver chip, and the actual output current value of the driver chip exceeds the current reference value, closed-loop control processing is performed.

[0086] Figure 7 This is a schematic diagram illustrating the temperature change of the continuous high-brightness current in some embodiments. Figure 8 This is a schematic diagram illustrating the changes in current and temperature when the brightness of a small window varies, as shown in some embodiments. Figure 7 and Figure 8The initial current value is the maximum output current of the driver chip. This initial current value can be determined based on the hardware operating limits of the driver chip and LEDs (e.g., junction temperature exceeding limits due to excessive instantaneous power consumption) and the front-end power supply output power limit. In practice, different images correspond to different backlight power supply output power limits. For example, for a 100% white window, considering the power supply output power limit, the initial current value should be set to 30mA. For a 50% white window, considering the power supply output power limit, the initial current value can be set to 60mA, and smaller windows can have larger initial current values. Figure 7 It can be seen that the solution in this application fully utilizes the capabilities of the chip and LED beads within a small window area, achieving high current output in a short time and thus obtaining high image brightness. Figure 8 It can be seen that when the temperature of the driver chip is not high, the output current of the driver chip can reach a higher preset value, thereby obtaining a higher brightness value.

[0087] In some embodiments, the controller determines the current reduction rate based on the current temperature value of the driver chip. For example, the higher the temperature value of the driver chip, the higher the current reduction rate; the lower the temperature value of the driver chip, the lower the current reduction rate. In one example, a mapping table between the temperature value of the driver chip and the current reduction rate is set. After obtaining the current temperature value of the driver chip, the controller can obtain the corresponding current reduction rate by looking up the table.

[0088] In some embodiments, the controller determines the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip. Specifically, the controller calculates the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip. For example, the controller calculates the product of the current reduction rate and the adjustment period to obtain the current reduction value during the adjustment period; and calculates the difference between the actual output current value of the current driver chip and the current reduction value to obtain the target output current value of the current driver chip.

[0089] In some embodiments, the controller controls the driver chip to output a current corresponding to the target output current value to at least one LED, so that the light-emitting unit group provides backlight.

[0090] Figure 9 This is a schematic diagram of current-temperature changes in some embodiments, such as... Figure 9 As shown, when the temperature of the driver chip reaches the upper limit T3, the closed-loop control of this scheme will reduce the output current of the driver chip and stabilize the output current of the driver chip near the current reference value.

[0091] It is understood that in some embodiments, closed-loop control processing can reduce the output current value of the driver chip from the basic output current value to the current reference value and stabilize it near the current reference value. The solution in this application, based on the temperature of the driver chip, can slowly reduce the output current value of the driver chip through closed-loop control processing, which can avoid image flickering, reduce the temperature of the driver chip, and ensure the display requirements of the display device. Therefore, some embodiments improve the accuracy and reliability of backlight control.

[0092] In conjunction with the above embodiments, the controller can determine the target output current value of the driver chip based on backlight data. In some embodiments, the controller can also determine the timing of the driver chip's output current based on the backlight data. Specifically, the backlight data corresponding to the light-emitting unit group includes the brightness value of the LEDs in the light-emitting unit group and the light-emitting time of the LEDs.

[0093] As an example, in some embodiments, after the controller obtains the backlight data corresponding to the current backlight component, it further includes:

[0094] The controller determines the duty cycle of each light-emitting unit group based on the backlight data;

[0095] The aforementioned controller controls the driver chip to output a current corresponding to the target output current value to at least one LED chip, so that the light-emitting unit group provides backlight, including:

[0096] The controller determines the product of the target output current value and the duty cycle corresponding to the light-emitting unit group;

[0097] The controller sends the product result to the driver chip, so that the driver chip outputs the current corresponding to the target output current value to at least one LED during the light-emitting period corresponding to the light-emitting unit group.

[0098] In practical applications, the controller obtains the backlight data corresponding to the current backlight component based on the received video input signal. The controller then determines the light-emitting time of the LEDs, i.e., the time for the driver chip to output current, based on the backlight data. The duty cycle of each light-emitting unit group is determined according to the light-emitting time of the LEDs in that group. Based on the duty cycle, the time for the driver chip to output current during the entire light-emitting phase can be determined.

[0099] Correspondingly, the controller sends the product result to the driver chip. Based on the product result, the controller chip can determine the target output current value and the light-emitting period corresponding to the light-emitting unit. Therefore, in some embodiments, the controller sends the product result to the driver chip, which can control the driver chip to output the current corresponding to the target output current value to at least one LED during the light-emitting period corresponding to the light-emitting unit group, thereby controlling the brightness and light-emitting duration of the LED.

[0100] Furthermore, when the temperature of the driver chip is low, it can support instantaneous high-brightness emission to meet higher display requirements. As an example, in some embodiments, after the controller determines the duty cycle corresponding to each light-emitting unit group based on the backlight data, it also includes:

[0101] The controller determines whether the basic output current value is above the lower limit of the high-brightness current range;

[0102] If so, the controller adjusts the duty cycle of the light-emitting unit group according to the current temperature value and basic output current value of the driver chip.

[0103] In practical applications, when the temperature of the driver chip is below the upper limit of its temperature range, the driver chip can output a larger current, allowing the LED to support high brightness. It should be noted that when the LED temperature is not high, it can support instantaneous high brightness, but in this case, the drive current is large, causing the LED temperature to rise rapidly and its luminous efficiency to decrease significantly. To ensure the system's temperature reliability, the high-brightness emission time needs to be controlled. For example, the driver chip can internally incorporate a high-current operating time control register to regulate the high-brightness emission time.

[0104] Specifically, if the base output current value is above the lower limit of the high-brightness current range, it indicates that the current output of the current driver chip is relatively large, resulting in high LED brightness. The controller adjusts the duty cycle of the corresponding light-emitting unit group based on the current temperature value of the driver chip and the base output current value, thus adjusting the light-emitting duration of the LEDs and improving the reliability of backlight control. For example, when the temperature of the driver chip is 10℃ and the base output current value is 70mA, the light-emitting duration is set to 10s, with a time interval of 5 minutes between two light-emitting events; when the temperature of the driver chip is 10℃ and the base output current value is 60mA, the light-emitting duration is set to 20s, with a time interval of 6 minutes between two light-emitting events; when the temperature of the driver chip is 50℃ and the base output current value is 70mA, the light-emitting duration is set to 5s, with a time interval of 10 minutes between two light-emitting events; and when the temperature of the driver chip is 50℃ and the base output current value is 60mA, the light-emitting duration is set to 10s, with a time interval of 11 minutes between two light-emitting events.

[0105] Regarding the method for determining the upper limit of the temperature range of the driver chip, as an example, in some embodiments, before the controller obtains the backlight data corresponding to the current backlight component, it further includes:

[0106] The controller obtains the upper limit of the junction temperature range of the driver chip in each light-emitting unit group, the upper limit of the operating temperature range of the lamp beads, and the temperature margin of the display device;

[0107] The controller determines the upper limit of the driver chip's temperature range based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the LED beads, and the temperature margin of the display device.

[0108] In practical applications, the distance between the driver chip and the LED chip is relatively small. Therefore, factors affecting the temperature of the driver chip include both the temperature of the LED chip and the temperature of the driver chip itself. If the temperature of the driver chip is too high, it will cause the temperature of the LED chip to rise, reducing the reliability of the LED chip. Therefore, the temperatures of the driver chip and the LED chip are correlated.

[0109] The upper limit of the junction temperature range of the driver chip refers to the highest operating temperature of the driver chip. In practice, the smaller temperature value between the upper limit of the junction temperature range of the driver chip and the upper limit of the operating temperature range of the LED in each light-emitting unit group is selected, and the product of this smaller temperature value and the temperature margin of the display device is calculated to obtain the upper limit of the temperature range of the driver chip. For example, if the upper limit of the junction temperature range of the driver chip is 150°C, the upper limit of the operating temperature range of the LED is 120°C, and the temperature margin of the display device is 80%, the smaller temperature value between the upper limit of the junction temperature range of the driver chip and the upper limit of the operating temperature range of the LED in each light-emitting unit group is selected as 120°C. The product of 120°C and the temperature margin of the display device is 80%, resulting in an upper limit of the temperature range of the driver chip of 96°C.

[0110] It is understandable that considering the temperature correlation between the driver chip and the LED beads, setting the upper limit of the driver chip's temperature range can improve the reliability of backlight control.

[0111] In practical applications, the upper limit of the temperature range of the driver chip can also take into account other factors affecting the temperature rise of the driver chip. These are not specifically limited here. As an example, in some embodiments, before the controller obtains the backlight data corresponding to the current backlight component, it further includes:

[0112] The controller acquires the external ambient temperature of the light-emitting unit group;

[0113] The controller, after determining the upper limit of the driver chip's temperature range based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the LED beads, and the temperature margin of the display device, also includes:

[0114] The controller adjusts the upper limit of the driver chip's temperature range based on the external ambient temperature of the light-emitting unit group.

[0115] In practical applications, the external ambient temperature varies for light-emitting unit groups at different locations within the backlight assembly. For example, the ambient temperature is lower for light-emitting unit groups at the edges compared to those at the center. Specifically, the controller acquires the ambient temperature of the light-emitting unit groups and adjusts the upper limit of the driver chip's temperature range based on this temperature value. For instance, the higher the ambient temperature of the light-emitting unit groups, the lower the upper limit of the driver chip's temperature range; conversely, the lower the ambient temperature of the light-emitting unit groups, the higher the upper limit of the driver chip's temperature range.

[0116] Understandably, by taking into account the external ambient temperature of the light-emitting unit group and adjusting the upper limit of the temperature range of the driver chip, the accuracy of backlight control is improved.

[0117] Furthermore, since the image changes in real time, the output current of the driver chip also changes in real time. The temperature value of the driver chip is an integral; therefore, to ensure image display quality, when reducing the output current of the driver chip, the influence of adjacent light-emitting unit groups needs to be considered comprehensively. As an example, in some embodiments, after the controller determines the current reduction rate based on the current temperature value of the driver chip, it further includes:

[0118] The controller determines the current adjustment ratio by comparing the base output current value of the driver chip with the base output current value of the adjacent driver chip; where the adjacent driver chip is the driver chip in the light-emitting unit group adjacent to the light-emitting unit group to which the driver chip is located.

[0119] The controller adjusts the rate of current reduction based on the current regulation ratio to obtain the regulated rate of current reduction.

[0120] The controller determines the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip, specifically including:

[0121] The controller determines the target output current value of the current driver chip based on the adjusted current reduction rate and the actual output current value of the current driver chip.

[0122] In some embodiments, the controller determines the ratio of the base output current value of the driver chip to the base output current value of the adjacent driver chip to obtain the current adjustment ratio. The current adjustment ratio is the current ratio corresponding to the current actual display requirements. Therefore, based on the current adjustment ratio, the current value output by the adjacent driver chip is dynamically adjusted, which can avoid the current value mismatch between the adjacent driver chips, effectively ensure the display quality of the image, and improve the accuracy of backlight control.

[0123] As an example, regarding the method for determining the current reduction rate, in some embodiments, the display device further includes a closed-loop control speed register, wherein the controller determines the current reduction rate based on the current temperature value of the driving chip, including:

[0124] The controller obtains the closed-loop control speed corresponding to the temperature value from the closed-loop control speed register based on the current temperature value of the driver chip.

[0125] The controller obtains the current reduction rate based on the closed-loop control speed.

[0126] In practical applications, the closed-loop control speed register stores the closed-loop control speed corresponding to the temperature values ​​of different driver chips. Specifically, the controller retrieves the corresponding closed-loop control speed from the closed-loop control speed register based on the current temperature value of the driver chip. The closed-loop control speed corresponding to the temperature values ​​of different driver chips can be obtained through driver chip temperature rise experiments.

[0127] In some embodiments, the closed-loop control speed can be dynamically adjusted for different window sizes. For example, for a small window, the temperature rise of the driver chip is faster under high current conditions. Therefore, for a small window, a larger closed-loop control speed can be set for the same temperature value of the driver chip.

[0128] It is understood that the higher the closed-loop control speed, the greater the current reduction rate. In this embodiment, the calculation method for the current reduction rate is not specifically limited. For example, the current reduction rate can be obtained by calculating the product of the closed-loop control speed and the preset parameters.

[0129] It is understandable that the closed-loop control speed register includes the closed-loop adjustment speed corresponding to different temperature values ​​of the driver chip, and the current reduction rate can be obtained based on the closed-loop adjustment speed, which can improve the accuracy of backlight control.

[0130] In some embodiments of the backlight control method for a display device, the controller acquires backlight data corresponding to the current backlight component; based on the backlight data, it determines the basic output current value of the driver chip in each light-emitting unit group; if the temperature value of the current driver chip does not reach the upper limit of the driver chip's temperature range, the controller uses the basic output current value as the target output current value of the current driver chip; otherwise, if the actual output current value of the driver chip exceeds the current reference value, the controller performs closed-loop control processing; the controller controls the driver chip to output current corresponding to the target output current value to at least one LED, so that the light-emitting unit group provides backlight. In some embodiments, if the temperature value of the current driver chip reaches the upper limit of the driver chip's temperature range, the controller determines the current reduction rate based on the current driver chip's temperature value, and determines the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip. That is, the controller performs closed-loop control of the driver chip's output current value based on the driver chip's temperature value, ensuring that the driver chip's output current value decreases slowly and stabilizes near the current reference value. This ensures stable display of the current image while reducing the temperature of the driver chip, thereby avoiding image flicker and improving the accuracy and reliability of backlight control.

[0131] In some embodiments, this application also provides a display device, such as... Figure 3 As shown, the display device includes:

[0132] The display panel 10 is configured to display an image based on display data and backlight provided by the backlight assembly.

[0133] Backlight assembly 20, which includes multiple light-emitting unit groups, each light-emitting unit group including a driver chip and at least one LED bead;

[0134] A controller 250, coupled to the display panel 10 and the backlight assembly 20, is configured to:

[0135] Get the backlight data corresponding to the current backlight component 20;

[0136] Based on the backlight data, determine the basic output current value of the driver chip in each light-emitting unit group;

[0137] If the current temperature of the driver chip does not reach the upper limit of the driver chip's temperature range, the base output current value is used as the target output current value of the driver chip; otherwise, if the actual output current value of the driver chip exceeds the current reference value, closed-loop control processing is executed. The closed-loop control processing includes: determining the current reduction rate based on the current temperature of the driver chip; and determining the target output current value of the driver chip based on the current reduction rate and the actual output current value of the driver chip.

[0138] The control driver chip outputs a current corresponding to the target output current value to at least one LED bead, so that the light-emitting unit group provides backlight.

[0139] In practical applications, backlight components are configured to provide backlighting for the display panel, enabling it to display images. Different images have different grayscale levels for each pixel, requiring precise control of the brightness of the LEDs in each light-emitting unit group. It can be understood that the brightness of an LED is positively correlated with the current flowing through it; that is, the brightness of an LED is directly proportional to the current output by the driver chip. The higher the current flowing through the LED, the brighter it is. Specifically, the controller controls the output of different currents from the driver chip in the light-emitting unit group to the LEDs, thereby controlling the brightness of the LEDs and thus the grayscale of each pixel.

[0140] Specifically, the controller receives the backlight video input signal, and obtains the backlight data corresponding to the current backlight component and the display data corresponding to the display panel based on the received video input signal. The controller can perform format conversion, timing control and other processing on the backlight data and display data.

[0141] In practical applications, the controller can determine the backlight data corresponding to each light-emitting unit group based on the backlight data corresponding to the current backlight component. For example, the backlight data corresponding to the light-emitting unit group includes the brightness value of the LEDs in the light-emitting unit group, or parameters characterizing the brightness of the LEDs. Correspondingly, the controller determines the basic output current value of the driver chip in each light-emitting unit group based on the backlight data. Specifically, this includes: the controller obtaining the backlight data corresponding to each light-emitting unit group based on the backlight data corresponding to the backlight component; the controller determining the brightness value of the LEDs in each light-emitting unit group based on the backlight data corresponding to each light-emitting unit group; and the controller calculating the basic output current value of the driver chip based on the brightness value of the LEDs in the light-emitting unit group.

[0142] Based on the above explanation, the basic output current value refers to the output current value of the driver chip calculated by the controller based on the backlight data. In practice, the distance between the driver chip and the LED chips is relatively small. If the current temperature of the driver chip reaches the upper limit of its temperature range, it could be due to a high temperature of the driver chip itself or a high temperature of the LED chips. A high temperature of the driver chip may affect its lifespan, and a high temperature of the LED chips may affect their lifespan and the stability of their light emission.

[0143] In some embodiments, closed-loop control is performed based on the temperature value of the driver chip to dynamically adjust the output current value of the driver chip, thereby reducing the temperature value of the driver chip and ensuring the reliability and stability of the backlight assembly. Specifically, a temperature sensor is installed on the driver chip, which collects the temperature value of the driver chip in real time and sends the temperature value of the driver chip to the controller. The controller determines whether the current temperature value of the driver chip has reached the upper limit of the driver chip's temperature range.

[0144] Understandably, if the current temperature of the driver chip is below the upper limit of its temperature range, it indicates that the current temperature of the driver chip is low. Therefore, the controller uses the base output current value as the target output current value for the current driver chip. Conversely, if the current temperature of the driver chip reaches the upper limit of its temperature range, it indicates that the current temperature of the driver chip is high. Therefore, the controller performs closed-loop control to reduce the output current value of the driver chip.

[0145] Furthermore, to meet the display requirements of the display device, the output current value of the driver chip should not be less than the current reference value. Specifically, the controller obtains the actual output current value and temperature value of the driver chip. When the temperature value of the driver chip reaches the upper limit of the driver chip's temperature range, and the actual output current value of the driver chip exceeds the current reference value, closed-loop control processing is executed.

[0146] Specifically, the current reduction rate is determined based on the current temperature of the driver chip. For example, the higher the temperature of the driver chip, the greater the current reduction rate; the lower the temperature of the driver chip, the smaller the current reduction rate. In one example, a mapping table between the temperature of the driver chip and the current reduction rate is set up. After the controller obtains the current temperature of the driver chip, it can obtain the corresponding current reduction rate by looking up the table.

[0147] Correspondingly, determining the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip includes: calculating the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip. For example, calculating the product of the current reduction rate and the adjustment time to obtain the current reduction value during the adjustment period; calculating the difference between the actual output current value of the current driver chip and the current reduction value to obtain the target output current value of the current driver chip.

[0148] It is understood that in some embodiments, closed-loop control processing can reduce the output current value of the driver chip from the basic output current value to the current reference value and stabilize it near the current reference value. The solution in this application, based on the temperature of the driver chip, can slowly reduce the output current value of the driver chip through closed-loop control processing, which can avoid image flickering, reduce the temperature of the driver chip, and ensure the display requirements of the display device. Therefore, in some embodiments, it improves the accuracy and reliability of backlight control.

[0149] In some embodiments, after acquiring the backlight data corresponding to the current backlight component, the controller 250 is further configured to:

[0150] Determine the duty cycle of each light-emitting unit group based on the backlight data;

[0151] When the control driver chip outputs a current corresponding to the target output current value to at least one LED, the controller is configured as follows:

[0152] Determine the product of the target output current value and the duty cycle corresponding to the light-emitting unit group;

[0153] The product result is sent to the driver chip so that the driver chip outputs the current corresponding to the target output current value to at least one LED during the light-emitting period corresponding to the light-emitting unit group.

[0154] In practical applications, the controller obtains the backlight data corresponding to the current backlight component based on the received video input signal. The controller then determines the light-emitting time of the LEDs, i.e., the time for the driver chip to output current, based on the backlight data. The duty cycle of each light-emitting unit group is determined according to the light-emitting time of the LEDs in that group. Based on the duty cycle, the time for the driver chip to output current during the entire light-emitting phase can be determined.

[0155] Correspondingly, the controller sends the product result to the driver chip. Based on the product result, the controller chip can determine the target output current value and the light-emitting period corresponding to the light-emitting unit. Therefore, in some embodiments, the controller sends the product result to the driver chip, which can control the driver chip to output the current corresponding to the target output current value to at least one LED during the light-emitting period corresponding to the light-emitting unit group, thereby controlling the brightness and light-emitting duration of the LED.

[0156] In some embodiments, after determining the duty cycle corresponding to each light-emitting unit group based on the backlight data, the controller 250 is further configured to:

[0157] Determine whether the basic output current value is above the lower limit of the high-brightness current range;

[0158] If so, the duty cycle of the light-emitting unit group is adjusted according to the current temperature value and basic output current value of the driver chip.

[0159] In practical applications, when the temperature of the driver chip is below the upper limit of its temperature range, the driver chip can output a larger current, allowing the LED to support high brightness. It should be noted that when the LED temperature is not high, it can support instantaneous high brightness, but in this case, the drive current is large, causing the LED temperature to rise rapidly and its luminous efficiency to decrease significantly. To ensure the system's temperature reliability, the high-brightness emission time needs to be controlled. For example, the driver chip can internally incorporate a high-current operating time control register to regulate the high-brightness emission time.

[0160] Specifically, if the base output current value is above the lower limit of the high brightness current range, it indicates that the current output of the current driver chip is large and the brightness of the LED is large. The controller adjusts the duty cycle of the light-emitting unit group according to the current temperature value of the driver chip and the base output current value, that is, adjusts the light-emitting duration of the LED, thereby improving the reliability of backlight control.

[0161] In some embodiments, before acquiring the backlight data corresponding to the current backlight component, the controller 250 is further configured to:

[0162] Obtain the upper limit of the junction temperature range of the driver chip in each light-emitting unit group, the upper limit of the operating temperature range of the lamp bead, and the temperature margin of the display device;

[0163] The upper limit of the temperature range of the driver chip is determined based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the micro LED, and the temperature margin of the display device.

[0164] In practical applications, the distance between the driver chip and the LED chip is relatively small. Therefore, factors affecting the temperature of the driver chip include both the temperature of the LED chip and the temperature of the driver chip itself. If the temperature of the driver chip is too high, it will cause the temperature of the LED chip to rise, reducing the reliability of the LED chip. Therefore, the temperatures of the driver chip and the LED chip are correlated.

[0165] The upper limit of the junction temperature range of the driver chip refers to the highest operating temperature of the driver chip. In practice, the smaller temperature value between the upper limit of the junction temperature range of the driver chip and the upper limit of the operating temperature range of the lamp bead in each light-emitting unit group is selected, and the product of the smaller temperature value and the temperature margin of the display device is calculated to obtain the upper limit of the temperature range of the driver chip.

[0166] In some embodiments, considering the temperature correlation between the driver chip and the LED beads, setting an upper limit for the temperature range of the driver chip can improve the reliability of backlight control.

[0167] In some embodiments, before acquiring the backlight data corresponding to the current backlight component, the controller 250 is further configured to:

[0168] Obtain the external ambient temperature of the backlight unit group;

[0169] After determining the upper limit of the driver chip's temperature range based on the upper limit of the junction temperature range of the driver chip, the upper limit of the operating temperature range of the LED beads, and the temperature margin of the display device, the controller is further configured as follows:

[0170] The upper limit of the driver chip's temperature range is adjusted according to the external ambient temperature of the backlight unit group.

[0171] In practical applications, the external ambient temperature varies for light-emitting unit groups at different locations within the backlight assembly. For example, the ambient temperature is lower for light-emitting unit groups at the edges compared to those at the center. Specifically, the controller acquires the ambient temperature of the light-emitting unit groups and adjusts the upper limit of the driver chip's temperature range based on this temperature value. For instance, the higher the ambient temperature of the light-emitting unit groups, the lower the upper limit of the driver chip's temperature range; conversely, the lower the ambient temperature of the light-emitting unit groups, the higher the upper limit of the driver chip's temperature range.

[0172] In some embodiments, the upper limit of the temperature range of the driver chip is adjusted by taking into account the external ambient temperature of the light-emitting unit group, thereby improving the accuracy of backlight control.

[0173] In some embodiments, after determining the current reduction rate based on the current temperature value of the current driving chip, the controller 250 is further configured to:

[0174] The ratio of the base output current value of the driver chip to the base output current value of the adjacent driver chip is determined to obtain the current adjustment ratio; where the adjacent driver chip is the driver chip in the light-emitting unit group adjacent to the light-emitting unit group where the driver chip is located.

[0175] Based on the current regulation ratio, the current reduction rate is adjusted to obtain the regulated current reduction rate.

[0176] When determining the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip, the controller is configured as follows:

[0177] The target output current value of the current driver chip is determined based on the adjusted current reduction rate and the actual output current value of the current driver chip.

[0178] In some embodiments, the controller determines the ratio of the base output current value of the driver chip to the base output current value of the adjacent driver chip to obtain the current adjustment ratio. The current adjustment ratio is the current ratio corresponding to the current actual display requirements. Therefore, based on the current adjustment ratio, the current value output by the adjacent driver chip is dynamically adjusted, which can avoid the current value imbalance of the adjacent driver chip, effectively ensure the display quality of the image, and improve the accuracy of backlight control.

[0179] In some embodiments, the display device further includes a closed-loop control speed register; when determining the current reduction rate based on the current temperature value of the current driving chip, the controller is configured to:

[0180] Based on the current temperature value of the driver chip, obtain the closed-loop control speed corresponding to the temperature value from the closed-loop control speed register;

[0181] The rate of current reduction is obtained based on the closed-loop control speed.

[0182] In practical applications, the closed-loop control speed register stores the closed-loop control speed corresponding to the temperature values ​​of different driver chips. Specifically, the controller retrieves the corresponding closed-loop control speed from the closed-loop control speed register based on the current temperature value of the driver chip. The closed-loop control speed corresponding to the temperature values ​​of different driver chips can be obtained through driver chip temperature rise experiments.

[0183] In some embodiments, the closed-loop control speed can be dynamically adjusted for different window sizes. For example, for a small window, the temperature rise of the driver chip is faster under high current conditions. Therefore, for a small window, a larger closed-loop control speed can be set for the same temperature value of the driver chip.

[0184] It is understood that the higher the closed-loop control speed, the greater the current reduction rate. In some embodiments, the calculation method for the current reduction rate is not specifically limited. For example, the current reduction rate is obtained by calculating the product of the closed-loop control speed and a preset parameter.

[0185] In some embodiments, the closed-loop control speed register includes the closed-loop adjustment speed corresponding to different temperature values ​​of the driver chip, and the current reduction rate can be obtained based on the closed-loop adjustment speed, which can improve the accuracy of backlight control.

[0186] In some embodiments of the display device, the controller acquires backlight data corresponding to the current backlight component; based on the backlight data, it determines the basic output current value of the driver chip in each light-emitting unit group; if the temperature value of the current driver chip does not reach the upper limit of the driver chip's temperature range, the controller uses the basic output current value as the target output current value of the current driver chip; otherwise, if the actual output current value of the driver chip exceeds the current reference value, the controller performs closed-loop control processing; the controller controls the driver chip to output current corresponding to the target output current value to at least one LED, so that the light-emitting unit group provides backlight. In some embodiments, if the temperature value of the current driver chip reaches the upper limit of the driver chip's temperature range, the controller determines the current reduction rate based on the current driver chip's temperature value, and determines the target output current value of the current driver chip based on the current reduction rate and the actual output current value of the current driver chip. That is, the controller performs closed-loop control of the driver chip's output current value based on the driver chip's temperature value, ensuring that the driver chip's output current value decreases slowly and stabilizes near the current reference value. This ensures stable display of the current image while reducing the temperature of the driver chip, thereby avoiding image flicker and improving the accuracy and reliability of backlight control.

[0187] This application also provides a computer-readable storage medium, which may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. Specifically, the computer-readable storage medium stores program instructions configured as the methods described in the above embodiments.

[0188] This application also provides a program product including execution instructions stored in a readable storage medium. At least one controller of a display device can read the execution instructions from the readable storage medium, and the at least one controller executes the execution instructions to cause the display device to implement the handwriting erasure methods provided in the various embodiments described above.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0190] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of embodiments suitable for specific application considerations.

Claims

1. A display device, characterized by comprising: The display device comprises: a backlight assembly comprising a plurality of light emitting unit groups, each light emitting unit group comprising a driving chip and at least one lamp bead; a display panel configured to display an image based on display data and backlight provided by the backlight assembly; a controller coupled to the display panel and the backlight assembly, the controller being configured to: obtain backlight data corresponding to the backlight assembly; determine a basic output current value of the driving chip corresponding to each light emitting unit group according to the backlight data; if a temperature value of the driving chip does not reach an upper limit value of a temperature range of the driving chip, take the basic output current value as a target output current value of the driving chip; if the temperature value of the driving chip reaches the upper limit value of the temperature range of the driving chip, and an actual output current value of the driving chip exceeds a current reference value, perform a closed-loop control process; the closed-loop control process comprises: obtaining a closed-loop control speed corresponding to the temperature value of the driving chip from a closed-loop control speed register of the display device according to the temperature value of the driving chip, and determining a current reduction rate according to the closed-loop control speed; determining a current adjustment ratio by determining a ratio of the basic output current value of the driving chip to a basic output current value of an adjacent driving chip, wherein the adjacent driving chip is a driving chip in a light emitting unit group adjacent to the light emitting unit group where the driving chip is located; adjusting the current reduction rate based on the current adjustment ratio to obtain an adjusted current reduction rate; obtaining a current reduction value in an adjustment period according to a product of the adjusted current reduction rate and an adjustment time length; determining a target output current value of the driving chip according to a difference between an actual output current value of the driving chip and the current reduction value in the adjustment period, so that the output current value of the driving chip slowly decreases and stabilizes around the current reference value; controlling the driving chip to output a current corresponding to the target output current value to the at least one lamp bead, so that the light emitting unit group provides backlight.

2. The display device of claim 1, wherein, After obtaining the backlight data corresponding to the backlight assembly, the controller is further configured to: determine a duty cycle corresponding to each light emitting unit group according to the backlight data; when controlling the driving chip to output a current corresponding to the target output current value to the at least one lamp bead, the controller is configured to: determine a product of the target output current value and the duty cycle corresponding to the light emitting unit group; send the product to the driving chip, so that the driving chip outputs a current corresponding to the target output current value to the at least one lamp bead in a light emitting period corresponding to the light emitting unit group.

3. The display device of claim 2, wherein, After determining the duty cycle corresponding to each light emitting unit group according to the backlight data, the controller is further configured to: determine whether the basic output current value is above a lower limit value of a highlight current range; if yes, adjust the duty cycle corresponding to the light emitting unit group according to the temperature value of the driving chip and the basic output current value.

4. The display device of claim 1, wherein, Before acquiring the backlight data corresponding to the backlight assembly at present, the controller is further configured to: acquire an upper limit value of a junction temperature range of the driving chip, an upper limit value of a working temperature range of the lamp bead, and a temperature margin of the display device in each light emitting unit group; determine the upper limit value of the temperature range of the driving chip according to the upper limit value of the junction temperature range of the driving chip, the upper limit value of the working temperature range of the lamp bead, and the temperature margin of the display device.

5. The display device of claim 4, wherein, Before acquiring the backlight data corresponding to the backlight assembly at present, the controller is further configured to: acquire an external environment temperature of the light emitting unit group; after determining the upper limit value of the temperature range of the driving chip according to the upper limit value of the junction temperature range of the driving chip, the upper limit value of the working temperature range of the lamp bead, and the temperature margin of the display device, the controller is further configured to: adjust the upper limit value of the temperature range of the driving chip according to the external environment temperature of the light emitting unit group.

6. A backlight control method of a display device, characterized by, The method is applied to the display device of any one of claims 1-5, the display device comprising a display panel, a backlight assembly, and a controller, the backlight assembly comprising a plurality of light emitting unit groups, each light emitting unit group comprising a driving chip and at least one lamp bead; the method comprising: the controller acquires backlight data corresponding to the backlight assembly at present; the controller determines a basic output current value of the driving chip corresponding to each light emitting unit group according to the backlight data; if the temperature value of the driving chip at present does not reach the upper limit value of the temperature range of the driving chip, the controller takes the basic output current value as a target output current value of the driving chip at present; if the temperature value of the driving chip at present reaches the upper limit value of the temperature range of the driving chip, and the actual output current value of the driving chip exceeds a current reference value, a closed-loop control process is performed; the closed-loop control process comprises: determining a current reduction rate according to the temperature value of the driving chip at present; determining a target output current value of the driving chip at present according to the current reduction rate and the actual output current value of the driving chip at present; the controller controls the driving chip to output a current corresponding to the target output current value to the at least one lamp bead, so that the light emitting unit group provides backlight.

7. The method of claim 6, wherein, After the controller acquires the backlight data corresponding to the backlight assembly at present, the method further comprises: the controller determines a duty cycle corresponding to each light emitting unit group according to the backlight data; the controller controls the driving chip to output a current corresponding to the target output current value to the at least one lamp bead, comprising: the controller determines a product result of the target output current value and the duty cycle corresponding to the light emitting unit group; the controller sends the product result to the driving chip, so that the driving chip outputs a current corresponding to the target output current value to the at least one lamp bead in a light emitting period corresponding to the light emitting unit group.

8. The method of claim 7, wherein, After the controller determines the duty cycle corresponding to each light emitting unit group according to the backlight data, the method further comprises: The controller determines whether the base output current value is above a lower limit value of a highlight current range; If yes, the controller adjusts the duty cycle corresponding to the light emitting unit group according to the current temperature value of the driving chip and the base output current value.

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