Large-size curved surface partition dimming backlight module and driving control method thereof

Abstract

The present application relates to the technical field of backlight module, solves the problem that it is difficult to realize uniform partition dimming and optical bonding on large-size curved screen in the prior art, and provides a large-size curved partition dimming backlight module and a driving control method thereof.The backlight module comprises a back plate, a lamp plate, a light reflection assembly, an optical film plate assembly and a metal frame, the lamp plate is bonded to the inner side curve of the back plate, the light reflection assembly is glued to the LED lamp plate, the optical film plate assembly is arranged on the light reflection assembly, and the fixed frame presses and fixes the lamp plate, the light reflection assembly and the optical film plate assembly in the back plate; the LED lamp plate comprises a light emitting array and a driving circuit, the light emitting array comprises a plurality of independently dimmed light emitting areas, the light emitting area comprises a plurality of LED light emitting units, and the driving circuit is used for driving the LED light emitting units in the light emitting array to perform constant current gray scale adjustment.The present application realizes consistent partition constant current gray scale adjustment of curved surface bonding, thereby significantly improving the light emitting uniformity and the reliability of the module.

Description

Technical Field

[0001] This invention relates to the field of backlight modules, and more particularly to a large-size curved surface dimming backlight module and its driving control method. Background Technology

[0002] With the development of display technology, large-size curved screens are becoming increasingly popular in scenarios such as televisions, conference displays, and gaming. To improve the contrast and image quality of curved screens, local dimming is usually required in the backlight module. Local dimming can effectively suppress light leakage in dark areas and improve the brightness range by independently controlling the luminous intensity of LEDs in different areas.

[0003] In the existing technology, the back plate, LED arrangement and optical film of the planar backlight module are all designed according to the planar design. If it is directly transplanted to the curved display, problems such as uneven optical layer, severe speckle and poor heat dissipation will occur. The curved structure requires irregular fixing of components such as back plate, LED board and reflector. Traditional screws or clamps are not easy to meet the requirements of curved surface fitting and heat dissipation.

[0004] Therefore, it is evident that there is currently no mature overall solution for large-size curved surface dimming backlight modules that can both fit the curved surface and achieve independent grayscale in multiple zones, while also ensuring reliable heat dissipation and convenient mechanical assembly. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a backlight module for large-size curved surface local dimming and its driving control method to address the problem of difficulty in achieving uniform local dimming and optical bonding on large-size curved screens.

[0006] In a first aspect, embodiments of the present invention provide a large-size curved surface local dimming backlight module, the backlight module comprising: The back panel comprises a curved back panel, an LED light panel, a reflector assembly, an optical film assembly, and a metal frame. The LED light panel is bonded and fixed to the inner curved surface of the back panel. The reflector assembly is bonded to the LED light panel with adhesive. The optical film assembly is disposed on the reflector assembly. The metal frame presses the light panel, the reflector assembly, and the optical film assembly together into the back panel. The LED light panel includes a light-emitting array and a driving circuit. The light-emitting array includes several independently dimming light-emitting areas, and each light-emitting area includes multiple LED light-emitting units. The driving circuit is used to receive serial data signals and synchronous clock signals from the host controller, and drive the LED light-emitting units in each light-emitting area of ​​the light-emitting array to perform constant current grayscale adjustment.

[0007] In a second aspect, embodiments of the present invention provide a driving control method for a backlight module, used in the large-size curved surface local dimming backlight module described in the first aspect, the method comprising: The image to be displayed is divided according to the light-emitting area to obtain the backlight display image of each light-emitting area, wherein the backlight module includes multiple light-emitting areas distributed along a preset direction; Grayscale control data is obtained based on the pixel brightness value of each backlit display image; The grayscale control data is converted to obtain the corresponding serial data signal; Based on the serial data signal and the synchronous clock signal, each of the light-emitting areas is controlled to display the image to be displayed.

[0008] In summary, the beneficial effects of the present invention are as follows: The large-size curved surface zone dimming backlight module and its driving control method provided in this invention feature a tightly fitted backlight module and backlight panel. Since the lamp board and driving circuit are bonded together on the inner curved surface of the curved backplate, and the reflector assembly and LED lamp board are glued together, the entire light-emitting component is tightly attached to the backplate. This ensures that the optical axis of each light-emitting area remains consistent with the curved surface in the curved state, avoiding optical mismatch and localized light spot problems commonly found in planar modules in curved applications. The driving circuit can receive serial data signals and synchronous clock signals, performing constant current grayscale adjustment on the LED light-emitting units of each independent light-emitting area. This allows each zone to be independently lit or dimmed, and brightness can be finely adjusted through grayscale control, thereby achieving higher contrast and more realistic image presentation in different image scenarios. The optical film assembly, reflector assembly, and lamp board are structurally designed with a fixed frame pressing them together within the backplate. This not only enables rapid assembly and disassembly but also avoids manual alignment errors, enhancing the stability and sealing between components. This makes the integrated assembly of the optical film layer and the light-emitting component in the curved state more reliable. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0010] Figure 1 This is a schematic diagram of the structure of the large-size curved surface zone dimming backlight module according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a portion of the light-emitting array in an embodiment of the present invention; Figure 3 This is a schematic diagram of the driving circuit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the driving circuit according to an embodiment of the present invention; Figure 5 This is another schematic diagram of the driving circuit according to an embodiment of the present invention; Figure 6a This is another schematic diagram of the driving circuit according to an embodiment of the present invention; Figure 6b This is another schematic diagram of the driving circuit according to an embodiment of the present invention; Figure 7 This is another schematic diagram of the driving circuit according to an embodiment of the present invention; Figure 8 This is a flowchart illustrating the driving control method for the backlight module according to an embodiment of the present invention. Detailed Implementation

[0011] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0012] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0013] Example 1 Please see Figure 1 This invention provides a large-size curved surface local dimming backlight module, the backlight module comprising: The back panel is curved, LED light panel 1 is LED light panel 1, reflector assembly, optical film assembly and metal frame 4, wherein the light panel is bonded and fixed to the inner curved surface of the back panel, the reflector assembly is bonded to the LED light panel by adhesive, the optical film assembly is disposed on the reflector assembly, and the metal frame presses the light panel, the reflector assembly and the optical film assembly together into the back panel; The LED light panel includes a light-emitting array and a driving circuit. The light-emitting array includes several independently dimming light-emitting areas, and each light-emitting area includes multiple LED light-emitting units. The driving circuit is used to receive serial data signals and synchronous clock signals from the host controller, and drive the LED light-emitting units in each light-emitting area of ​​the light-emitting array to perform constant current grayscale adjustment.

[0014] Specifically, the innermost layer of the backlight module is a curved metal backplate formed by stamping or bending, its shape being completely similar to the curved display screen to be matched. Thermally conductive adhesive is pre-coated on the inner curved surface of the backplate, and threaded holes and positioning grooves are opened at appropriate locations to provide fixing space and heat dissipation channels for the subsequent installation of the lamp board and driver circuit. Closely attached to the concave curved surface of the backplate is the lamp board: this lamp board is actually a PCB that can be bent along the corresponding curvature, integrating a zoned LED light-emitting array and driver circuit. The light-emitting array is divided into several independently dimmable light-emitting areas, each containing several LED light-emitting units. The driver circuit includes cascaded constant current driver chips, zone power switches (MOSFETs), signal buffers, and multiple NTC temperature sensors, etc. All these components are directly soldered to the PCB attached to the backplate, and form a tight heat conduction path with the metal backplate through thermally conductive adhesive, ensuring that the heat generated by the LEDs and driver chips can be quickly transferred to the backplate and dissipated to the external environment.

[0015] See Figure 2 In this invention, the light-emitting array on the LED panel no longer drives all LEDs in parallel or series, but divides the entire light-emitting panel into N non-interfering "light-emitting areas" (e.g., N=4). Each light-emitting area corresponds to a certain display area of ​​the backlight module, such as the center, edge, or corner of the screen, for local dimming of areas with different brightness requirements. This is an example, not a limitation. Figure 2In the diagram, LED_V1, LED_V2, LED_V3, and LED_V4 represent the common power supply bus for the first, second, third, and fourth zones, respectively. Each zone bus is controlled by a constant current drive circuit or a power switching device, allowing for independent lighting or extinguishing of all LEDs in that zone. Taking the first zone (LED_V1) as an example, its internal LED arrangement is illustrated. The power supply bus LED_V1 for the first zone is connected to multiple series-connected LED arrays via a set of parallel branch circuits of equal size.

[0016] Each parallel branch circuit consists of several LED light-emitting units connected in series. The number of units in series is typically determined by the forward voltage drop of each LED and the required operating voltage. A current-limiting resistor is usually connected in series at the right end of each LED string to prevent excessive current surges during transient switching. A three-stage decoupling capacitor is connected in parallel between the current-limiting resistor and the LED string to smooth switching transients, suppress ripple, and ensure stable light emission of the LED string under constant current. Multiple series-connected LED arrays are connected in parallel on the same bus within the same area. The purpose of this parallel arrangement is to accommodate a large number of LEDs in a single area, increasing the overall luminous flux. The number of parallel branches is designed based on the actual screen size and brightness requirements. When the area bus is enabled and the constant current driver outputs the corresponding current, the constant current output on the bus is distributed to each LED string through the current-limiting resistor, allowing all parallel branches to simultaneously receive the same current, achieving uniform lighting of multiple LED arrays throughout the area. All parallel LED strings share the same area power supply bus, which is controlled by a power switching device (MOSFET) or a constant current drive output channel. When a specific area needs to be completely turned off, the power switching devices in that area disconnect the bus from the main power supply, cutting off the power supply to all LEDs in the area. Simultaneously, even if the constant current driver continuously outputs a constant current signal, the LEDs in that area will not light up because the bus is de-energized. Conversely, when the area is enabled (the switching devices are on) and the constant current driver outputs a constant current, the bus supplies power to all parallel LED strings in the entire area, causing each LED string to be energized and illuminate simultaneously, thus achieving the effect of lighting up the entire area.

[0017] Directly above the light-emitting array, the reflector is securely attached to the light panel using adhesive. The reflector is a flexible plastic or metal substrate with multiple precision reflective cups. The center of each reflector corresponds to one of the LED units below, converging and evenly projecting the light emitted by the LEDs forward. The reflector also features a fixing structure around its periphery that engages with threaded holes or locating pins in the back panel, allowing for quick and accurate alignment and secure placement of the reflector with the LED array on the light panel during assembly, creating a seamless fit.

[0018] Above the reflector is the optical film assembly, which consists of five layers of optical films with different functions, stacked from top to bottom: a first brightness enhancement film 34, a second brightness enhancement film 33, a light-diffusing film 32, a beam-splitting film 31, and a reflective film 2. The top layer, the first brightness enhancement film, suppresses direct glare and maintains light transmittance through its frosted or anti-glare coating. The next layer, the second brightness enhancement film, further concentrates the incident light and improves overall light transmittance by using microstructure refraction or aluminum-plated edge sealing. The light-diffusing film is responsible for uniformly diffusing the concentrated light and eliminating local hot spots. The beam-splitting film precisely distributes the light to the front display area, ensuring consistent brightness from any viewing angle. The bottom layer, the reflective film, reflects any light that leaks below back upwards to further improve utilization. Each pair of membrane layers is bonded together with a special adhesive (such as VHB double-sided tape or light guide adhesive), and positioning springs or foam adhesive are added to the edges of the membrane layers to ensure that each membrane layer fits flat and without wrinkles or air gaps when the surface is curved.

[0019] The outermost metal frame secures the light panel, reflector, and optical film assembly within the back panel. The metal frame is typically made of aluminum alloy profiles or bent iron plates, and features clips and bolts that engage with the back panel: first, the reflector, with the optical film already attached, is attached to the light panel and placed into the recessed area of ​​the back panel. Then, the metal frame is snapped onto the side edge of the back panel and tightened with screws, creating a slight clamping force that firmly secures the light-emitting components and optical film to the curved back panel. This combination of clips and bolts ensures the module will not loosen during vibration or temperature changes and also provides a complete metal heat transfer path for subsequent heat dissipation.

[0020] After assembly, the host controller inputs serial data signals and synchronous clock signals to the logic buffer in the driver circuit via the FPC or gold finger interface. After being protected and buffered by transient suppression diodes, the signals sequentially drive the constant current driver chips at each stage. The chips provide constant current output to the LED units of each light-emitting area based on the calculated grayscale value. Simultaneously, if a certain area needs to be turned off or dimmed, the corresponding MOSFET power switch will disconnect the common power supply bus for that area after receiving the switching signal from the constant current driver chip, thereby achieving area-level "turn-off" or brightness adjustment. Meanwhile, the NTC thermistor on the PCB continuously collects temperature signals. When the temperature of a certain area approaches a preset threshold, the host controller can gradually reduce the grayscale of that area; if the temperature exceeds the threshold, it can further reduce the grayscale or implement power-off protection to avoid overheating damage to the LEDs or driver devices. The overall heat dissipation structure composed of the curved backplate and metal frame can quickly dissipate excess heat, allowing the entire backlight module to maintain good thermal balance even during high-brightness operation.

[0021] In one embodiment, a privacy film 35 is also included above the first brightness enhancement film 34.

[0022] In summary, this embodiment directly attaches the lamp board and driving circuit to the inner side of the curved back panel, tightly attaches the reflector to the LED array, and superimposes multiple layers of optical films on top, then secures it as a whole with a metal frame. This design not only ensures a perfect fit between the light-emitting area and the curved back panel, eliminating optical mismatch and dead angles when using curved surfaces, but also achieves flexible dimming from the pixel level to the area level through constant current drive and power switching, and ensures the thermal stability of the system by utilizing the heat dissipation channels of the metal back panel. The entire solution provides a complete backlight solution for large-size curved screens that balances optical uniformity, free-area dimming, and highly reliable heat dissipation.

[0023] As an optional embodiment of the present invention, the optical film assembly includes, from top to bottom, a high-brightness film, a brightness enhancement film, a light diffusion film, and a beam splitting film, wherein the first brightness enhancement film, the second brightness enhancement film, the light diffusion film, and the beam splitting film are bonded together by a fixing adhesive.

[0024] In an optional embodiment of the present invention, the optical film assembly consists of four layers of optical films stacked in functional order, namely, a first brightness enhancement film, a second brightness enhancement film, a light-diffusing film, and a light-splitting film, from top to bottom, and the layers are bonded together with a special adhesive. The function and assembly method of these four films will be explained in a coherent manner below with reference to the layer relationship shown in the exploded view.

[0025] First, the top layer is the first brightness enhancement film. This film is usually made of polyester (PET) material with a finely atomized finish, and its surface has an anti-glare coating or micron-sized matte particles. This layer is placed on top to suppress glare caused by direct light, while providing a moderate "mirror" reflection effect while ensuring high light transmittance (usually greater than 95%). This allows the screen to maintain a clear image under ambient light, while avoiding glare from direct sunlight.

[0026] Below the first brightness enhancement film is the second brightness enhancement film. The inner side of the second brightness enhancement film typically contains micro-prisms or optical diffusion structures, and sometimes a ring of aluminum foil is sealed around the edge. Its main function is to further focus and direct the light, after the first brightness enhancement film has initially integrated it, thus improving the overall backlight efficiency. In other words, when the light emitted by the LED light-emitting unit passes through the reflector and diffuser film to this layer, the second brightness enhancement film uses its geometric prism structure to re-refract and guide the light, concentrating more of the unwanted diffused light towards the viewing direction, thereby increasing brightness and making the backlight brighter at the same power.

[0027] Next is the diffuser film. This film typically has glass beads or nanoscale optical diffusion particles uniformly embedded in the substrate. Its function is to diffuse the light from the brightness enhancement film or directly from the reflector. Since curved light-emitting areas themselves can produce hot spots or uneven brightness, the diffuser film uses a micron-sized particle structure to disperse these light rays, making them evenly distributed and eliminating abrupt brightness changes at the boundaries of the areas. The diffuser film also prevents obvious LED grid patterns from appearing in the image, ensuring a smooth overall visual effect in the backlit area.

[0028] Beneath the diffuser film at the bottom layer is the beam splitter. The beam splitter itself features precisely designed microprisms or trapezoidal optical channels to redirect light that diffuses in all directions from the diffuser film, concentrating it onto the top layer of the first brightness enhancement film and ultimately through the display panel. In short, the beam splitter acts as a "secondary correction" for the light, ensuring that the scattered light is accurately directed towards the viewing area, improving contrast and visual uniformity. Because curved backlights require different exit angles, the prism structure of the beam splitter is typically fine-tuned to accommodate this curvature, ensuring consistent brightness from any viewing angle.

[0029] These four layers of films are bonded together using a specialized adhesive (such as VHB double-sided tape or light guide adhesive). The adhesive tape must maintain sufficient elasticity and adhesion even on curved surfaces to prevent film detachment, curling, or air bubbles due to temperature changes or vibration. During actual assembly, the first and second brightness enhancement films are first aligned and bonded using positioning bosses. Then, the light-diffusing film is similarly attached to the first brightness enhancement film below it using positioning holes or edge guide tape. Finally, the beam-splitting film is pasted under the light-diffusing film. The entire stacking process must be carried out in a dust-free environment to prevent dust particles from adhering to the tape and remaining between the film layers, affecting the uniform transmission of light.

[0030] Since the bottom reflective film is removed, this embodiment primarily relies on the reflective component (a reflector attached to the LED panel) to reflect downward-leaking light back to the scattering and beam-splitting system, and then the four layers of film complete the final optical management. Therefore, compared to the five-layer scheme including the reflective film, this four-layer scheme is structurally slightly simplified, but the reflective component itself must maintain high reflectivity to ensure that the overall system's luminous efficiency does not significantly decrease when there is no reflective film at the bottom. For applications with smaller curvature or lower requirements for optical efficiency, this four-layer scheme can achieve sufficiently uniform backlighting with fewer film layers, while simultaneously reducing manufacturing costs and the cumulative thickness between film layers.

[0031] In summary, in this optional embodiment, the optical film assembly consists of four layers sequentially: a first brightness enhancement film, a second brightness enhancement film, a diffusing film, and a beam-splitting film. Each film layer is seamlessly bonded within the curved frame using adhesive, ensuring optical uniformity in the fully curved surface bonding state while reducing the stacked thickness and manufacturing complexity caused by the number of film layers. This satisfies the uniformity and brightness requirements of curved surface dimming backlighting and simplifies the overall structure to a certain extent, thus improving production efficiency and cost control.

[0032] Preferably, the driving circuit includes: The area power supply control module includes several switching devices for controlling the power supply to the light-emitting area. Each switching device is connected to the power supply circuit of a light-emitting area and is used to selectively switch the power supply on and off according to the area control signal. A multi-channel constant current drive module includes multiple cascaded constant current drive units. Each constant current drive unit is provided with multiple constant current output channels, which are respectively connected to the multiple light-emitting units for driving each light-emitting unit with constant current output. The interface and signal buffer module is used to receive serial data signals and clock signals, process the serial data signals and clock signals only, and send them sequentially to the constant current drive unit. The temperature detection module is used to collect the operating temperature of the light-emitting array in real time and generate a temperature feedback signal. The regional power supply control module turns the power supply of each light-emitting area on or off according to the temperature feedback signal and the regional control signal. The multi-channel constant current drive adjusts the brightness of the LED light-emitting unit according to the serial data signal.

[0033] Specifically, in the overall structure, the driving circuit and the LED light-emitting array are co-located on the curved LED light panel and bonded to the back plate with thermally conductive adhesive to achieve efficient heat dissipation. The driving circuit mainly consists of four modules: a regional power supply control module, a multi-channel constant current driving module, an interface and signal buffer module, and a temperature detection module. These four modules work together to achieve complete closed-loop control from signal input and temperature protection to regional and pixel-level joint dimming.

[0034] First, the zone power supply control module includes several power switching devices (typically N-channel MOSFETs). The drain of each switching device is connected to the common LED power bus supplied by the backplane, and the source is connected to the LED circuit corresponding to a specific light-emitting area. When the host controller or constant current drive module needs to power on or off a certain light-emitting area, it outputs a high-level or low-level drive signal to the gate of the corresponding MOSFET, causing the MOSFET to turn on or off, thereby selectively providing or cutting off the common power supply to that light-emitting area. Thus, during normal image playback, if certain areas need to be partially turned off (e.g., displaying pure black or dark scenes), the driver only needs to turn off the corresponding MOSFET, immediately cutting off the power supply to that area, achieving rapid zone-level black or dark field control. Simultaneously, when an area is off, the constant current drive module will no longer switch the constant current to the LEDs in that area, further reducing power consumption.

[0035] Adjacent to the zone power switch is the multi-channel constant current driver module. This module consists of multiple cascaded constant current driver chips (such as the TLC59614 or TLC59610 series). Each constant current driver chip integrates several (usually 16) constant current output channels, each directly connected to a specific LED light-emitting unit. In addition to providing constant current output, the constant current driver chip also supports PWM grayscale adjustment, enabling precise control of the brightness of each LED based on externally transmitted grayscale data. The cascading method means that the "serial data output" of the first driver chip is connected to the "serial data input" of the next chip, and the "clock output" is connected to the "clock input" of the next chip, thus forming a continuous data and clock link. The entire frame of grayscale data sent from the outside is first written to the first chip, and then passed cascaded to all chips, ensuring that every LED light-emitting unit in the entire backlight module receives consistent and synchronized grayscale information. While the area is still powered on, the constant current drive module illuminates the LED light-emitting units in each zone with an appropriate current intensity based on the received serial grayscale data signal and synchronous clock signal. If the area has been disconnected by the area power supply control module, although the constant current drive module can continue to output a constant current PWM signal, the LED will not light up because the power supply is disconnected, thus truly realizing the linkage control between the area and the sub-pixel level.

[0036] In terms of signal transmission, the interface and signal buffer module is responsible for pre-processing the serial data signal (SIN) and synchronous clock signal (CLK) output by the upper controller (such as a TCON board or a dedicated MCU) with anti-interference protection and shaping before sending them to the first chip of the constant current drive module. Specifically, the SIN and CLK output by the upper controller are first protected by multiple transient suppression diodes (TVS diodes) to resist electrostatic discharge and high voltage surges; then they enter the "first logic buffer" and the "second logic buffer"—the former performs threshold amplification of the SIN signal to ensure a clean level; the latter performs impedance matching and amplitude amplification of the CLK signal to prevent timing jitter or reflections during long-distance transmission. The buffered SIN and CLK are then fed step by step to the serial data input and clock input of the constant current drive module through a pair of 0Ω jumpers or a small number of impedance matching resistors, providing a stable and anti-interference data signal source for the entire drive chip chain.

[0037] To ensure the reliability of LEDs and driver devices during high-power, long-term operation, a temperature detection module is integrated into the driver circuit. This module utilizes multiple sets of NTC thermistors mounted at different critical locations on the curved LED board (such as the LED concentration area or near the constant current chip), and connected in series with high-precision voltage divider resistors to form a voltage divider circuit. One end of each voltage divider circuit is connected to a 3.3V reference voltage source, and the other end outputs a sampling signal, which is transmitted to the upper controller via traces on the PCB or FPC. The upper controller periodically reads these analog voltage values ​​and converts them into the corresponding temperature. When the temperature of a certain area approaches or exceeds a preset threshold, the upper controller first issues a grayscale attenuation request, instructing the constant current driver module to reduce the grayscale output of that area (gradually reducing the LED current). If the temperature continues to rise and exceeds the maximum safety threshold, the upper controller then issues a power-off command to the area power supply control module, turning off the MOSFET in the corresponding area and temporarily shutting down the power supply to that area. When the temperature drops back to a safe range, the grayscale drive is gradually restored and the area power supply is turned back on. This closed-loop temperature control strategy enables the backlight module to maintain image continuity and effectively protect the device safety in high-brightness or heavy-load scenarios.

[0038] In summary, in this embodiment, the driving circuit achieves rapid on / off control of a large area through a regional power supply control module to address brightness requirements in high dynamic contrast scenarios; it achieves fine-tuned multi-grayscale adjustment for each LED light-emitting unit through a multi-channel constant current driving module to improve overall image uniformity; it ensures stable data signal transmission on curved irregular traces through an interface and signal buffer module; and it implements real-time temperature monitoring and graded current limiting or power-off protection through a temperature detection module. These four components work together to not only meet the stringent requirements of large-size curved backlights for local dimming, optical consistency, and heat dissipation safety, but also provide a reasonable balance between the overall module's cost and manufacturing process, ultimately achieving a curved backlight solution with high contrast, high uniformity, and long lifespan.

[0039] As an optional embodiment of the present invention, the constant current driving chip includes a serial data input terminal, a serial data output terminal, a clock input terminal, a clock output terminal, and multiple constant current output terminals; The serial data output terminal is connected to the serial data input terminal of the next constant current driver chip, and the clock output terminal is connected to the clock input terminal of the next constant current driver chip, so as to form a serial data link and a clock link through cascading. All constant current output terminals of each constant current driver chip are directly connected to the input terminals of the LED light-emitting units in the corresponding light-emitting area. The serial data link and the clock link are used to synchronously drive the grayscale of all LED light-emitting units in the light-emitting array.

[0040] For details, see Figures 3-5 Each TLC59614 constant current driver chip, designated U2, U3, ..., U13, has the following main pins: The serial data input (SIN) pin receives serial grayscale data from the previous chip (or upstream buffer). The data frame contains the target current information (i.e., grayscale value) for each output channel. The serial data output (SOUT) pin, after receiving and buffering a complete data frame at the chip's SIN pin, continues to transmit data to the SIN pin of the next chip via SOUT, enabling sequential programming of multiple chips.

[0041] The clock input (CLK_I) pin receives the clock signal from the upper stage and is used to trigger data shift and register operations on each rising or falling edge of the clock. The clock output (CLK_O) pin, after receiving the clock signal from CLK_I and completing timing processing, passes the clock edge to the CLK_I of the next stage chip via CLK_O, ensuring that all chips maintain strict timing synchronization.

[0042] Multiple constant current output terminals (OUT0…OUT15), each OUTx pin corresponds to a constant current output channel, which is directly electrically connected to the input terminal of a certain LED light-emitting unit in the backlight module. The TLC59614 internally outputs a constant current (typically between tens of milliamps and hundreds of milliamps, which can be set through the chip's internal registers) to drive the corresponding LED to light up or dim according to the grayscale value.

[0043] After the host controller calculates the grayscale value of each luminescent area, it packages them into a continuous serial data frame (the length is equal to the number of all constant current output channels, for example, 12 chips × 16 channels = 192 grayscale values, each channel is usually 12 bits or 16 bits). This data is input to the SIN terminal of U2 through the SIN signal line, accompanied by the CLK clock pulse to coordinate data shifting. When the rising edge of the clock CLK_I arrives, U2 shifts the contents of its internal shift register one bit to the right and reads the new bit of SIN as the LSB (Least Significant Bit). After 192 clock cycles, U2 will shift all the grayscale bits related to its 16 output channels into its register structure and complete the loading of the complete grayscale value according to the bit width. At the same time, for each bit shifted in, the previously read bit will be output from the SOUT of U2 to the SIN of the next chip, and U3 will also synchronously buffer it bit by bit in its own register. Because CLK is transmitted all the way to CLK_I of each chip, the data shift operations of all chips are strictly synchronized to ensure data consistency. After the data frame loading is completed, all constant current drive chips are triggered by a "storage completion signal" or the next "refresh clock" to decode the registered grayscale value into the corresponding PWM drive signal or switch reference, and finally each OUTx channel outputs the corresponding current. The current value output by different channels can reach hundreds of milliamps, forming a fixed brightness on the LED area bus.

[0044] As an optional embodiment of the present invention, the multiple constant current output terminals of the constant current driving chip are connected in parallel to one segment of multiple LED light-emitting units in the corresponding light-emitting area. The other end of the LED light-emitting unit is connected to the area power supply bus controlled by the corresponding switching device in the area power supply control module in a series or parallel manner. The LED light-emitting units in each light-emitting area share the common area power supply bus allocated by the area power supply control module.

[0045] Specifically, in this embodiment, all constant current output terminals (OUT0~OUTn) of each constant current driver chip are connected in parallel to the input terminals of multiple LED light-emitting units within a certain area it is responsible for driving. In other words, each output of the constant current driver chip is directly soldered to the cathode (or anode) of the corresponding LED, ensuring that the LED can obtain a precise constant current from the chip output.

[0046] In conjunction with this, the other end of the LED light-emitting unit (or the LED anode if the constant current output is connected to the LED cathode) does not return directly to the driver chip, but instead converges to the common power supply bus of this area. The power supply on / off of this common bus is uniformly managed by the switching devices (usually power MOSFETs) in the area power supply control module. Specifically, the anodes (or cathodes) of all LED light-emitting units in the area are connected to the same common bus, and this bus is only connected to the main power supply when the MOSFET of the corresponding area is turned on, thus ensuring that all LEDs in the area receive power simultaneously; once the MOSFET is turned off, the common bus is disconnected from the power supply, and the LEDs in the entire area are turned off when no current flows.

[0047] In practical circuits, each light-emitting area may contain several or even dozens of LEDs. Their anodes can be connected to a common bus in series or parallel, depending on the voltage and current matching required in the design. For example, when the LED light-emitting units are connected in series, the area bus provides a higher voltage to drive the total forward voltage drop of the series LEDs; while in parallel, it provides a higher current to ensure that each LED receives the rated current output from the constant current driver chip. Regardless of whether series or parallel connection is used, all these LED light-emitting units always share the same power supply switch—the area MOSFET. Therefore, any LED in the area can emit light normally as long as its corresponding constant current output terminal outputs a non-zero current and the MOSFET is turned on; if the MOSFET is turned off, even if the constant current output channel is still working, all LEDs in the area will not receive power, thus realizing centralized switching at the area level.

[0048] By using this parallel / series hybrid connection method between the constant current output and the regional bus, this embodiment ensures that each LED can obtain a constant and precise driving current, and can quickly control the lighting or turning off of the entire area through a single switch, thereby achieving efficient and flexible zone dimming function.

[0049] As an optional embodiment of the present invention, the interface and signal buffer module includes: a first logic buffer, a second logic buffer, and a multi-channel transient suppression diode, wherein: The first logic buffer is used to receive the serial data signal sent by the host controller. Its input terminal is connected to the serial data output terminal from the host controller, and its output terminal is connected to the serial data input terminal of the first-stage constant current drive chip in the multi-channel constant current drive module. It is used to perform threshold shaping on the serial data signal. The second logic buffer is used to receive the clock signal sent by the host controller. Its input is connected to the clock output of the host controller, and its output is connected to the clock input of the first-stage constant current drive chip in the multi-channel constant current drive module. It is used to perform impedance matching and amplitude amplification on the clock signal. Multiple transient suppression diodes are connected in series between the host controller and the input terminal of the first logic buffer, and between the host controller and the input terminal of the second logic buffer, to suppress external electrostatic surges and overvoltage interference.

[0050] Specifically, such as Figures 6a-6b As shown, the interface and signal buffer module is located at the very front of the driver circuit. It is responsible for reliably protecting, thresholding, and enhancing the driving capability of the serial data signal (SIN) and clock signal (CLKIN) output from the host controller (usually a display controller or main control board), before sending them to the front-end chips of the multi-channel constant current driver modules U2~U13 respectively. The following section describes the circuit as shown. Figures 6a-6b The instructions are explained step by step.

[0051] First, such as Figure 6a As shown, multiple transient voltage suppressor diodes (TVS) are used for input electrostatic discharge (ESD) and surge protection. The two key signal lines from the host controller are "SIN" and "CLKIN". Before reaching the logic buffer, each of these TVS diodes (D3, D4, D5, and D6) is connected in series. D3 / D4 is used for the SIN path, and D5 / D6 is used for the CLK path. They are connected in series between the output of the host controller and the input of the subsequent logic buffer.

[0052] The first logic buffer, i.e. Figure 6b In the 1A–1Y channel of U20, the SIN signal from the upper controller passes through two TVS diodes, D4 and D3, and reaches pin 3 (SIN) of U20. U20 is a dual-channel logic buffer. In this circuit, R7 provides impedance matching with the internal input capacitor of the driver chip to prevent signal reflection and jitter. C9 and C10 (22pF decoupling capacitors) are connected in parallel next to the buffer to provide RF decoupling for the clock and data lines of U20, further stabilizing the signal. The threshold level of U20 is designed to be 3.3V household level, which can filter out noise signals that may be provided by the upper controller and only allow digital levels that meet the TTL / CMOS standard, thus completing the threshold shaping function and ensuring that the data input to the constant current driver chip is a clear, glitch-free high / low level signal.

[0053] The second logic buffer, U20's 2A–2Y channel, is used for impedance matching and amplitude amplification of the clock signal. This buffer channel has the same threshold and drive capability as the first channel, but normally only processes the clock signal. R6 and R7 simultaneously serve as impedance matching and short-range filtering, ensuring that the clock waveform is not significantly distorted or reflected when transmitted to the constant current driver chip. Capacitors C7, C8, C9, and C10 are also connected in parallel with this logic buffer to decouple and stabilize the 3.3V power supply line and ground line, preventing signal jitter.

[0054] After passing through two logic buffers in U20, the threshold-shaped SIN and CLK signals, possessing sufficient driving capability, are sent via R7 and R6 to the SIN (pin 27) and CLK_I (pin 26) of the first-stage constant current driver chip U2 in the multi-channel constant current driver module, respectively. This allows U2 to read the corresponding serial grayscale bit on the SIN line at each clock edge (CLK) and buffer it in its internal register. After registering, U2 sends the remaining data frame from its serial data output SOUT (pin 3) to the SIN (pin 27) of the next chip U3; similarly, U2's clock output CLK_O (pin 1) continues to propagate the clock to U3's CLK_I (pin 26). This cascading propagation connects sequentially to U13, extending the serial data link and clock link to the entire constant current driver chip network, forming a complete synchronous grayscale driving link.

[0055] As an optional embodiment of the present invention, in the regional power supply control module, the control terminal of each of the switching devices is connected to a constant current output channel of the multi-channel constant current drive module. The drain of the switching device is connected to a common power supply, and the source is connected to the power supply circuit of the corresponding light-emitting area. This is used to turn on the switching device when the constant current drive module outputs a corresponding drive signal, thereby applying the voltage of the common power supply bus to the corresponding light-emitting area. When the constant current drive module stops outputting the corresponding drive signal, the switching device is turned off to cut off the power supply circuit of the corresponding light-emitting area.

[0056] For details, see Figure 7 In this embodiment, the switching devices of the regional power supply control module are power MOSFETs, labeled Q1, Q2, Q3, and Q4 respectively. The drains of Q1, Q2, Q3, and Q4 are directly connected to the VLED bus to receive the power supply voltage of the entire backlight panel. The source of each MOSFET is connected to the corresponding LED series-parallel circuit through a current-limiting / matching resistor. Additionally, a parallel decoupling capacitor group is connected between the source of each MOSFET and the LED array (e.g., C15–C18 correspond to the source of Q1, C19–C22 to Q2, C23–C26 to Q3, and C27–C30 to Q4).

[0057] In a multi-channel constant current drive module such as U1, each constant current output channel can output a constant current to drive an LED, or output a high / low level to drive the gate of a MOSFET.

[0058] When U1 outputs a high level on the corresponding output channel, the gate of the corresponding MOSFET receives sufficient gate-source voltage, the MOSFET turns on, and the VLED voltage is applied to the LED array in that area. Conversely, when U1 outputs a low level on the same output channel, the gate-source voltage is insufficient, the MOSFET turns off, thereby cutting off the VLED power supply to that area and causing the LED array in the corresponding area to be de-energized and extinguished.

[0059] This embodiment achieves the following functions and advantages by directly connecting the output channel of the constant current driver chip to the gate of the regional power MOSFET, and connecting the drain of the MOSFET to the common power bus and the source to the power circuit of its respective light-emitting region: When the constant current driver chip outputs a high level on a certain channel, the MOSFET in that area is turned on, and the voltage of the common power bus (VLED) is sent to the LED array of the corresponding light-emitting area. Combined with the grayscale current output of the constant current channel, the lighting or grayscale adjustment of that area can be completed.

[0060] When the constant current driver chip stops outputting a high level in this output channel, the corresponding MOSFET is turned off, cutting off the power supply circuit of this area, and all LEDs are forced to turn off, realizing area-level hard power-off or hard shutdown.

[0061] As an optional embodiment of the present invention, the temperature detection module includes several negative temperature coefficient thermistors and voltage divider resistors connected in series therewith. Each thermistor and the voltage divider resistor form a voltage divider circuit. One end of the voltage divider circuit is connected to a reference voltage source, and the other end is output to the analog input interface of the host controller for real-time output of the analog voltage signal corresponding to the temperature.

[0062] In this embodiment, the temperature detection module mounts several negative temperature coefficient (NTC) thermistors (labeled NTC1, NTC2, and NTC3 in the figure) at key heat-generating locations on the curved LED panel. Each NTC thermistor is connected in series with a precision voltage divider resistor (labeled R1, RZ1, RZ2, etc.) to form a voltage divider circuit. One end of this voltage divider circuit is connected to a reference voltage source, while the interface node in the middle of the circuit is directly connected to a certain analog input interface of the host controller (such as TCON or MCU). When the LEDs and constant current driver chips in a certain area are working, the local temperature rise will cause the corresponding NTC resistance to decrease, thus changing the output voltage at the voltage divider point of the series resistor. The host controller can obtain the temperature information of each NTC location in real time by periodically sampling this analog voltage. If the measured voltage is lower or higher than a certain preset threshold, the host controller will issue an instruction according to the predetermined over-temperature protection strategy, first reducing the grayscale output of that area, and if necessary, further cutting off the power supply to that area through the area power supply control module. In this way, the voltage divider circuit not only ensures a stable match between the temperature signal and the reference voltage source, but also allows the host controller to monitor the temperature at multiple points in real time using a single ADC channel, ensuring that the backlight module receives reliable over-temperature protection during high brightness or long-term operation.

[0063] Example 2 Please see Figure 8 This invention provides a control method for a backlight module, used in the large-size curved surface local dimming backlight module described in Embodiment 1, the method comprising: S1. Divide the image to be displayed according to the light-emitting area to obtain the backlight display image of each light-emitting area; Specifically, during the design phase, the entire curved backlight is pre-divided into several light-emitting areas (e.g., each area contains a fixed number of LED beads). These areas typically correspond to certain fixed areas of the display's entire screen content. To simplify calculations, a partition mapping table is usually created based on the number of partitions, recording the pixel coordinate range of each partition in the final displayed image. Whenever the display needs to refresh a new frame, the main controller (TCON or MCU) obtains the digital pixel data (e.g., RGB components) of that frame from the upper-layer video signal source. This pixel data is stored in a row-column format in the frame buffer.

[0064] S2. Obtain grayscale control data based on the pixel brightness value of each backlight display image; For each partition, the main controller calculates the "brightness" of all pixels within that partition. For example, it converts the RGB color value of each pixel to a grayscale value, and then averages the grayscale values ​​of all pixels within the partition. After obtaining the average grayscale value, it needs to be mapped to the grayscale levels supported by the constant current driver chip. Assuming the constant current chip supports 12-bit grayscale, the average brightness value in the range of 0–255 needs to be linearly or using a LUT (lookup table) to be mapped to a constant current value of 0–4095 (12-bit) or 0–65535 (16-bit), thus obtaining the constant current level value for each region, which is the grayscale control data.

[0065] S3. Convert the grayscale control data to obtain the corresponding serial data signal; Next, the grayscale control values ​​of each region are arranged and concatenated in a predetermined order to obtain a complete grayscale value sequence. This sequence is then packaged into a continuous binary serial data according to the communication format specified by the constant current driving device. This process adds necessary start or end codes before and after the data to ensure accurate identification and parsing downstream.

[0066] S4. Based on the serial data signal and the synchronization clock signal, control each of the light-emitting areas to display the image to be displayed.

[0067] Subsequently, the packaged serial grayscale data, along with the synchronization clock signal, is transmitted to the backlight driver stage via a pre-buffered and protected circuit. The driver stage reads the entire grayscale data segment sequentially and synchronously loads the grayscale values ​​corresponding to each backlight area into its internal register. After data loading is complete, the driver stage outputs a constant current to each area simultaneously, driving all LEDs within the corresponding area to emit light with the calculated current, thereby creating a backlight brightness distribution on the screen consistent with the original image.

[0068] Preferably, the backlight module is used to obtain grayscale control data based on the pixel brightness value of each backlight display image, including: S21. Based on the pixel brightness value of each backlight display image, sum up the brightness values ​​of all pixels belonging to the same light-emitting area to obtain the total brightness of each light-emitting area. Based on the pixel brightness value of each backlit display image, the brightness values ​​of all pixels belonging to the same luminous area are summed. The total brightness of that area is obtained by summing the brightness values ​​of all pixels within that luminous area. This step aims to provide basic data for subsequent brightness statistics and grayscale adjustment. The total brightness lays the foundation for calculating the average brightness of the area and other relevant luminous parameters, and also provides crucial brightness characteristic information for subsequent partition merging and grayscale control.

[0069] By summing the brightness values ​​of each luminous area, the overall brightness level of that area can be determined, providing accurate information for subsequent processing. Summarizing the brightness not only improves calculation accuracy but also reduces the impact of outliers from individual pixels on the overall effect of the area, ensuring the stability and consistency of subsequent processing.

[0070] S22. Perform statistical analysis based on the total brightness of each luminous region and the number of pixels in that luminous region to obtain the first pixel luminous parameter of each luminous region, wherein the pixel luminous parameter includes the mean pixel brightness, the variance of pixel brightness and the maximum pixel brightness. The average brightness of each luminous area is calculated based on its total brightness and the number of pixels within that area. The average brightness is the sum of the brightness values ​​of all pixels within the area divided by the number of pixels, reflecting the overall brightness level of that area. Simultaneously, the brightness variance is calculated, representing the degree of fluctuation in brightness values ​​within the area and indicating the consistency or variation in brightness within that area. The maximum pixel brightness is the brightness value of the single brightest pixel within the area, typically used to identify bright spots or extremely high-brightness areas.

[0071] These pixel emission parameters provide detailed data support for subsequent merging decisions, grayscale adjustment, and display optimization. The average pixel brightness reflects the overall brightness of the area, while the brightness variance helps determine the consistency of brightness distribution within the area. The maximum pixel brightness helps identify bright spots or highlights within the area, thus providing a basis for further partitioning optimization and merging decisions.

[0072] S23. Based on the pixel light emission parameters and the preset merging rules, determine several light emission regions to be merged in the light emission region and merge them to obtain the target light emission region; Based on the pixel emission parameters and preset merging rules, it is determined whether adjacent regions meet the merging conditions. The merging rules comprehensively consider the mean pixel brightness, brightness variance, and maximum pixel brightness. If the mean brightness difference between adjacent regions is small, and the variance is also small, it indicates that the brightness consistency between the two regions is good, and the merging conditions are met. If the maximum pixel brightness difference is small, it indicates that the brightness difference between the two regions is not significant, and merging will not have a significant impact on the brightness distribution.

[0073] By determining the merging criteria, several luminous regions that meet the criteria are merged into a new target luminous region. After merging, the pixel brightness characteristics of the target luminous region are recalculated to ensure brightness uniformity in the merged region and to provide a basis for generating grayscale control data. This step helps improve the overall uniformity of the display effect while reducing the computational complexity and power consumption caused by adjusting multiple independent regions.

[0074] S24. Obtain grayscale control data for each target luminous region based on the pixel luminous parameters of the corresponding regions to be merged in the target luminous region.

[0075] Based on the pixel emission parameters of the corresponding regions to be merged, the grayscale control data for each target emission region is calculated. In this step, the brightness adjustment parameters of the target emission region are first derived based on the mean, variance, and maximum brightness of the pixels in the regions to be merged. These pixel emission parameters have already been obtained in the previous step (S22) and reflect the brightness distribution characteristics of each region to be merged.

[0076] Based on these obtained pixel emission parameters, grayscale data mapping is performed to obtain grayscale control data for the target emission area. Grayscale control data is typically a value processed by a preset grayscale mapping function (such as linear mapping, gamma correction, perceptual correction, etc.), used to adjust the brightness of the target area to meet visual and power control requirements. Grayscale control data directly affects the brightness output of the LED backlight module, ultimately impacting the display effect.

[0077] This step ensures a smooth transition and uniformity in brightness and color across the merged target areas, preventing abrupt brightness changes or obvious boundary differences between zones. This process also considers local differences within the areas, ensuring a more natural and consistent visual effect in the final display.

[0078] Preferably, in one embodiment, the backlight module is used for in-vehicle screens, such as various display devices used in vehicles, such as in-vehicle central control screens, instrument panel displays, rearview mirror displays, navigation systems, etc. The characteristics of in-vehicle screens require the backlight module to have high brightness, low power consumption, wide viewing angle, and the ability to adapt to varying lighting environments, especially providing visual consistency and clarity in different driving environments.

[0079] In-vehicle displays typically comprise multiple distinct display areas, such as central control displays, navigation, and information displays. To ensure optimal display quality, the backlight module employs a 1D zone dimming structure, allowing each area to independently adjust its brightness based on the displayed content. Through visual weighting and average brightness analysis, the primary and adjacent zones are dynamically determined, prioritizing the protection of critical viewing areas on the in-vehicle screen (such as the central control panel and instrument cluster), ensuring the driver can clearly see important information without distraction while driving.

[0080] The step of determining several light-emitting regions to be merged in the light-emitting region according to the pixel light-emitting parameters and preset merging rules, and merging them to obtain the target light-emitting region includes: S231. Based on the average pixel brightness of all luminous areas, determine the luminous areas with the highest and lowest average pixel brightness as the main partitions, and record them as the extreme value main partitions. Specifically, the average pixel brightness of each region is first calculated from all luminous areas. The brightness values ​​of all pixels within each region are summed and divided by the number of pixels in that region to obtain the average brightness value of that region. Then, based on the calculated average brightness of each luminous area, the two luminous areas with the highest and lowest average brightness are identified and defined as extreme value master zones. These areas represent the brightest and darkest parts of the displayed content. For automotive screens, such areas typically require priority dimming because extremely bright or dark areas on automotive displays can affect the driver's visual perception and safety under different lighting conditions. Extremely bright and dark areas usually have a significant impact on the display effect in automotive applications. Prioritizing the processing of these areas can effectively improve image quality and avoid overexposure or distortion. By identifying these extreme value regions as master zones, brightness can be dynamically adjusted to ensure visual consistency and comfort, especially in bright light or nighttime driving environments.

[0081] S232. Based on the preset visual weight of the vehicle screen, determine the light-emitting area with a preset visual weight higher than the preset weight threshold as the main partition, and record it as the main visual partition. In this step, the preset visual weight of the in-vehicle screen refers to the weight value set based on the visual importance of the displayed content and the areas frequently viewed by the driver. For example, the center console area, instrument panel display area, or navigation area usually has a higher visual weight than edge areas, so these areas are assigned higher weight values. Using a preset threshold, areas with visual weights higher than this threshold are selected as the primary visual zones. These areas are typically the most important to the driver on the in-vehicle display and require priority control of brightness and contrast to ensure detail and clarity. By prioritizing the protection of the driver's frequently used visual areas, the display effect of these areas is ensured to remain high-quality, avoiding negative impacts on the driving experience due to low brightness or loss of detail. The primary visual zones typically include the most important content areas on the in-vehicle display (such as navigation, speedometer, etc.), and prioritizing control of these areas improves image clarity and visibility.

[0082] S233. When the total number of the main visual partitions and the extreme value main partitions is less than the threshold number of main partitions, obtain the global reference brightness based on the number of light-emitting areas and the average pixel brightness. If the total number of primary partitions selected in steps S231 and S232 is less than the preset threshold for the number of primary partitions, it is necessary to further select other partitions as primary partitions. In this step, the global reference brightness is calculated based on the number of remaining luminous areas and the average pixel brightness of each area. The global reference brightness is a global brightness level obtained by statistically analyzing the average brightness of all luminous areas, and is used to guide which areas should be selected as primary partitions. These areas typically have characteristics close to the global brightness and are suitable for merging or dimming optimization.

[0083] S234. Based on the absolute value of the difference between the average pixel brightness of the light-emitting areas other than the main partition and the global reference brightness, a weighted calculation is performed in combination with the preset visual weight to obtain the priority of the remaining light-emitting partitions. Specifically, in this step, the remaining luminous areas refer to those regions that have not yet been selected as primary regions. The degree of difference between each region and the global reference brightness is obtained by calculating the absolute value of the difference between the average pixel brightness of these remaining regions and the global reference brightness. Then, combined with the visual weight of each region, the differences between these regions are weighted to determine the priority of each remaining region. Regions with higher priority are more likely to become primary regions and are prioritized for merging or dimming. Through weighted calculations, the priority of primary regions can be dynamically adjusted based on the importance and brightness difference of each region, avoiding over-adjustment due to a single brightness difference.

[0084] S235. Select the remaining light-emitting partitions of the target number as the main partitions in the order of priority from highest to lowest, and denot them as priority main partitions, wherein the target number is the difference between the total number and the threshold number of the main partitions. Specifically, based on the priority calculated in step S234, several remaining light-emitting areas with the highest priority are selected as new main partitions in descending order until the number of main partitions reaches a preset threshold. The target number is the difference obtained by subtracting the number of selected main partitions from the total number of partitions. This step ensures that the number of all main partitions meets the target and prioritizes areas that are crucial to visual effects and in-vehicle displays. By prioritizing high-priority areas, a balance between the number of main partitions and visual effects can be ensured, preventing secondary areas from consuming excessive control resources.

[0085] S236. In the remaining partitions other than the primary partition, determine the adjacent partitions of each primary partition along the preset direction; In this step, adjacent partitions refer to partitions physically connected to the main partition, typically the adjacent areas to the left or right. Based on the partition arrangement, adjacent partitions for each main partition are determined along a preset direction (e.g., horizontal or vertical). This step establishes the relationships between adjacent areas for subsequent merge decisions and control, ensuring the merge operation is physically correctly connected. Determining adjacent partitions helps control the merge logic of adjacent areas, ensuring a natural and smooth transition in the final display.

[0086] S237. Determine whether the pixel emission parameters of the main visual partition and the corresponding adjacent partition meet the first preset merging rule. If they meet the rule, merge the main visual partition and the corresponding adjacent partition as the areas to be merged to obtain the target emission area. If they do not meet the rule, merge the main visual partition and the corresponding adjacent partition as the target emission area respectively. The pixel emission parameters of each main visual region and its adjacent regions are compared to determine if they meet the first preset merging rule. If the rule is met (e.g., small brightness differences, similar variances, etc.), the main visual region and its adjacent regions are merged into a new target emission region. If the merging rule is not met, the main region and its adjacent regions remain independent target emission regions. This strict merging rule avoids distortion of visual detail areas (such as dashboards and navigation areas) during the merging process, ensuring the brightness and detail preservation of important content.

[0087] S238. Determine whether the pixel emission parameters of the extreme value main partition, the priority main partition and their corresponding adjacent partitions meet the second preset merging rule. If they meet the rule, merge the extreme value main partition, the priority main partition and their corresponding adjacent partitions as areas to be merged to obtain the target emission area. If they do not meet the rule, merge the extreme value main partition, the priority main partition and their corresponding adjacent partitions as the target emission area.

[0088] Specifically, this step assesses the extreme value primary partition, the priority primary partition, and their adjacent partitions, checking whether their pixel emission parameters meet the second preset merging rule. If the rule is met, these regions are merged to generate a new target emission region; otherwise, these partitions remain independent as target emission regions.

[0089] In one embodiment, the first preset merging rule adopts the most stringent judgment criteria, which mainly includes the following conditions: The brightness of the two regions is determined to be similar based on whether the difference between the average pixel brightness of the main visual region and the adjacent regions is less than the first average threshold (such as the global brightness range of 1% to 3%). The consistency of content between two areas is determined by whether the pixel brightness variance of the main visual area and the adjacent areas is less than the first variance threshold (such as 30% of the average variance of the whole screen). Based on whether the difference in maximum pixel brightness between the main visual partition and adjacent partitions is less than the first extreme threshold (such as 2% of their respective average brightness), the consistency of local highlighting is further constrained. The main visual zones are located in the driver's critical field of vision or the core information area of ​​the in-vehicle screen, directly affecting driving safety and user experience. Therefore, merging operations must be performed with extreme caution. By strictly setting multiple tiny thresholds such as brightness, variance, and extreme values, merging is ensured only when there is almost indistinguishable homogeneous content and brightness. In most cases, these zones remain under independent control to protect information integrity and image detail. The second pre-defined merging rule adopts a moderately lenient judgment standard, specifically including: The brightness of two regions is determined to be similar based on whether the difference between the average pixel brightness of the extreme value primary partition or the priority primary partition and the adjacent partition is less than the second average threshold (such as the global brightness range of 5% to 10%). The acceptable range of content is determined by whether the pixel brightness variance of the extreme value primary partition or the priority primary partition and the adjacent partitions is less than the second variance threshold (such as 60% of the average variance of the whole screen). Based on whether the difference in maximum pixel brightness between the extreme value primary partition or priority primary partition and the adjacent partition is less than the second extreme value threshold (such as 10% of their respective average brightness), local highlight deviation is controlled. While extreme primary and priority primary zones are important for dynamic or brightness control of the image, their position or content may not directly affect the driver's key visual areas. Using a moderately lenient threshold can better improve energy efficiency and the uniformity of zone dimming. Under appropriate conditions, these zones can be merged without compromising the visual experience, simplifying the control process, optimizing power consumption, and improving the overall smoothness of the backlight image quality.

[0090] The first preset merging rule has stricter threshold settings, allowing only the merging of highly homogeneous zones; the second preset merging rule has relatively more lenient thresholds, balancing image quality and energy efficiency, and is suitable for dynamic dimming and edge area optimization. The first rule prioritizes protecting the independence and detail of the visual core area to prevent information loss during merging; the second rule aims to optimize the energy efficiency and uniformity of general or dynamically important areas, appropriately balancing visual and system efficiency.

[0091] It's important to note that region merging is dynamic and reversible. It only temporarily merges regions when their brightness and content are highly consistent and there is no visual difference (i.e., these regions are uniformly controlled within the current frame / cycle) to improve image uniformity and energy efficiency. Once a region's content changes significantly, or visual boundaries or increased detail appear, the system will immediately revert to independent region control, ensuring that the fundamental goal of regional dimming is never affected.

[0092] In automotive or some large-screen applications, large areas of content may change very little at certain times. Individual control of these areas can lead to a waste of hardware resources and computing power, and may even result in "discontinuous banding" or "zone boundary artifacts" between areas. Dynamic merging can improve the continuity and smoothness of the backlight image, optimize energy distribution, and avoid unnecessary independent adjustments. For content with low contrast, global gradients, or solid color backgrounds, merging zones can reduce the perceived brightness differences between zones and the abrupt changes caused by transitions, resulting in a more natural visual experience. Merging reduces the synchronous control tasks, lowers system power consumption and data communication pressure, and improves the real-time performance and stability of the entire backlight dimming system. After merging zones, the number of control commands that actually need to be transmitted and updated is reduced, the number of grayscale parameters driven by constant current is reduced, and the processing load per frame / cycle of the MCU or main controller also decreases accordingly, directly reducing the overall data communication pressure.

[0093] In one embodiment, step S24, obtaining grayscale control data for each target luminous region based on the pixel luminous parameters of the corresponding regions to be merged within the target luminous region, specifically includes: S241. Based on the pixel brightness of each region to be merged within each target luminous region, the average pixel brightness and maximum pixel brightness of the target luminous region are calculated respectively. First, based on the pixel brightness of each region to be merged within each target luminous region, the overall average pixel brightness and the maximum pixel brightness value of that target luminous region are calculated. Specifically, the system iterates through the brightness of all pixels within the region, sums them, and divides the sum by the total number of pixels to obtain the average. Simultaneously, the maximum pixel value is recorded during the iteration. These two parameters provide the basis for subsequent weighted fusion and anomaly detection.

[0094] S242. Based on the pixel brightness variance of each region to be merged within the target luminous region, set weighting coefficients for the mean pixel brightness and the maximum pixel brightness of the target luminous region. The weighting coefficient of the mean pixel brightness is negatively correlated with the region variance, and the weighting coefficient of the maximum pixel brightness is positively correlated with the region variance. Based on the pixel brightness variance of each region to be merged within the target luminous area, weighting coefficients are set for the mean and maximum pixel brightness of that target luminous area. Here, the weighting coefficient for the mean pixel brightness is negatively correlated with the region variance; that is, the lower the region variance, the greater the weight of the mean, resulting in more uniform display content where the mean dominates the merging process. Conversely, the weighting coefficient for the maximum pixel brightness is positively correlated with the region variance; the higher the region variance, the more pronounced the presence of bright spots, details, or other strong local variations within the region, thus emphasizing the weight of the maximum value in the merging process. This approach balances overall image smoothness with detail preservation.

[0095] S243. Based on the average pixel brightness, the maximum pixel brightness and their corresponding weight coefficients, perform weighted fusion to obtain the region fusion brightness value of the target luminous area; Based on the aforementioned average pixel brightness, maximum pixel brightness, and their corresponding weighting coefficients, a weighted fusion is performed to obtain the regional fused brightness value of the target luminous area. For example, when the variance is small, the fused brightness value is closer to the average; when the variance is large, the fused brightness value is more affected by the maximum brightness, to ensure that strong details or local bright spots are not diluted by the average.

[0096] S244. Based on the fused brightness value and the regional pixel brightness variance, obtain the initial grayscale value of the target luminous region through a preset nonlinear mapping curve. Based on the fused brightness value and the variance of regional pixel brightness, the initial grayscale value of the target luminous region is obtained through a preset nonlinear mapping curve. This mapping curve can be a human eye-perceived LUT, a gamma curve, or other existing brightness perception curves, used to convert the linear fused brightness into a grayscale value that better matches the subjective experience of the human eye, thereby improving the natural transition and sense of depth in the image.

[0097] S245. Based on the pixel brightness distribution characteristics of the target luminous region, count the number of local bright spots and local dark spots in the target luminous region respectively; Analyze the pixel brightness distribution characteristics within the target luminous area, and count the number of local bright spots and local dark spots. This is typically done by determining whether a pixel's brightness is higher than the overall area's mean plus several times the standard deviation (bright spot), or lower than the mean minus several times the standard deviation (dark spot). This step aims to capture abnormal local extreme values ​​within the area, preparing for subsequent fine-tuning.

[0098] S246. Fine-tune the initial grayscale value according to the number of local bright spots and local dark spots to obtain the target grayscale value; Specifically, when the proportion of local bright spots exceeds the first abnormal threshold, the initial grayscale value of the target luminous area is lowered by a preset coefficient, and the adjustment range increases with the increase of the proportion of bright spots and the concentration of local bright spot distribution; when the proportion of local dark spots exceeds the second abnormal threshold, the initial grayscale value is raised by a preset coefficient, and the adjustment range increases with the increase of the proportion of dark spots and the concentration of local dark spot distribution; by using preset maximum and minimum grayscale values, the adjusted grayscale value is kept within a suitable display range to obtain the target grayscale value; Specifically, if the proportion of bright spots exceeds the first abnormal threshold, it indicates that the area is locally too bright. The system will lower the initial grayscale value according to a preset coefficient, and the adjustment will be greater as the proportion and concentration of bright spots increase to avoid localized brightness affecting overall display consistency. Conversely, if the proportion of dark spots exceeds the second abnormal threshold, it indicates that the area is locally too dark, and the overall grayscale value needs to be increased. The increase will also increase as the proportion and concentration of dark spots increase. In addition, to prevent the grayscale value from exceeding the normal display range after fine-tuning, the system uses preset maximum and minimum grayscale values ​​to protect the final target grayscale value, ensuring that the output remains stable within a suitable display range.

[0099] S247. Obtain the grayscale control data based on the target grayscale value; First, the target grayscale value, after the aforementioned fusion calculation, perceptual correction, and anomaly fine-tuning, is used as the final regional brightness reference. Next, based on the target grayscale value, and according to the interface protocol of the constant current drive chip or backlight control circuit, grayscale control data corresponding one-to-one with the physical control channels of that region is generated. This step ensures that all the aforementioned results based on brightness analysis, fusion, and optimization can be converted in real-time into the control parameters required by the actual backlight dimming hardware, achieving precise adjustment of the regional backlight, thereby improving the dynamic image quality and energy efficiency of automotive or high-end display systems.

[0100] As an optional embodiment of the present invention, after controlling each of the light-emitting areas to display the image to be displayed according to the serial data signal and the synchronization clock signal, the method further includes: S5. Real-time acquisition of the operating temperature of the backlight module; While the backlight is operating normally, the system continuously monitors the temperature sensing points pre-placed on the module. Specifically, it converts the actual temperature near each area into a voltage signal through a voltage divider sensing circuit and sends it back to the main control terminal in real time, so as to keep track of the operating temperature of the backlight panel and the drive circuit.

[0101] S6. Adjust the grayscale control data according to the difference between the operating temperature and the preset temperature threshold; After each temperature measurement, the main controller compares the measured temperature value with a preset safety threshold: If the temperature is still within a safe range, maintain the current grayscale value; If the temperature of a certain area is close to the threshold (but has not exceeded it), the grayscale value of that area is gradually reduced by a certain percentage according to a preset ratio or step size to reduce heat generation. When the temperature exceeds the threshold, the grayscale value of that area is reduced to a primary safe grayscale (or directly set to zero low light), while retaining the corresponding power control logic to prevent further deterioration due to overheating. Through such differential calculation and graded attenuation, the continuity of the image can be maintained while preventing damage to electronic components in a certain area due to overheating.

[0102] S7. Control each of the light-emitting areas to display the image to be displayed according to the adjusted grayscale control data.

[0103] Finally, the main controller repackages the temperature-adjusted grayscale values ​​of each area into new serial data and sends it to the driver stage along with the clock signal. The driver stage then outputs constant current or partial power-off according to the updated grayscale, thus protecting overheated areas while allowing other areas to continue emitting light at their highest performance in the same frame or the next frame. The system then repeats steps S5–S7 to ensure that the backlight module maintains optimal brightness and thermal stability throughout the entire display process.

[0104] Through the closed-loop control of the above seven steps, this method not only achieves precise constant current dimming of each zone of the curved backlight, but also protects the device safety through dynamic grayscale adjustment in high-temperature environments, thus balancing image quality and reliability.

[0105] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0106] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0108] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0109] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0110] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0111] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A driving control method for a large-size curved surface zone dimming backlight module, characterized in that, A backlight module for large-size curved surface local dimming, the backlight module being used in automotive screens, the backlight module comprising: a curved back panel, an LED light panel, a reflector assembly, an optical film assembly, and a metal frame, wherein the LED light panel is bonded and fixed to the inner curved surface of the back panel, the reflector assembly is bonded to the LED light panel with adhesive, the optical film assembly is disposed on the reflector assembly, and the metal frame presses the light panel, the reflector assembly, and the optical film assembly together within the back panel; The LED light panel includes a light-emitting array and a driving circuit. The light-emitting array includes several independently dimming light-emitting areas, and each light-emitting area includes multiple LED light-emitting units. The driving circuit is used to receive serial data signals and synchronous clock signals from the upper controller, and drive the LED light-emitting units in each light-emitting area of ​​the light-emitting array to perform constant current grayscale adjustment. The method includes: The image to be displayed is divided according to the light-emitting area to obtain the backlight display image of each light-emitting area, wherein the backlight module includes multiple light-emitting areas distributed along a preset direction; Based on the pixel brightness value of each backlit display image, grayscale control data is obtained, including: Based on the pixel brightness value of each backlit display image, the brightness values ​​of all pixels belonging to the same luminous area are summed to obtain the total brightness of each luminous area; Statistical analysis is performed based on the total brightness of each luminous area and the number of pixels in that luminous area to obtain the first pixel luminous parameter of each luminous area. The pixel luminous parameter includes the mean pixel brightness, the variance of pixel brightness, and the maximum pixel brightness. The main visual partition is located in the driver's key field of vision or the core information area of ​​the vehicle screen. According to the pixel emission parameters and preset merging rules, several emission regions to be merged are determined in the emission region and merged to obtain the target emission region, including: according to the average pixel brightness of all emission regions, the emission regions with the highest and lowest average pixel brightness are determined as the main partitions, which are denoted as the extreme value main partitions; Based on the preset visual weights of the vehicle screen, the light-emitting areas with preset visual weights higher than the preset weight thresholds are identified as the main visual areas. When the total number of the main visual partitions and the extreme value main partitions is less than the threshold for the number of main partitions, the global reference brightness is obtained based on the number of light-emitting areas and the average pixel brightness. The priority of the remaining light-emitting regions is obtained by weighting the difference between the average pixel brightness of the light-emitting regions other than the main region and the global reference brightness, combined with the preset visual weights. The remaining light-emitting partitions of the target number are selected as primary partitions in order of priority from highest to lowest, and are denoted as priority primary partitions. The target number is the difference between the total number and the threshold number of primary partitions. In the remaining partitions other than the primary partition, the adjacent partitions of each primary partition are determined along the preset direction; Determine whether the pixel emission parameters of the main visual partition and the corresponding adjacent partitions meet the first preset merging rule. If they do, merge the main visual partition and the corresponding adjacent partitions as areas to be merged to obtain the target emission area. If they do not meet the rule, merge the main visual partition and the corresponding adjacent partitions as target emission areas respectively. The first preset merging rule includes: the difference between the average pixel brightness of the main visual partition and the adjacent partitions is less than the first average threshold, the variance of the pixel brightness of the main visual partition and the adjacent partitions is less than the first variance threshold, and the maximum pixel brightness difference between the main visual partition and the adjacent partitions is less than the first extreme value threshold. Determine whether the pixel emission parameters of the extreme value main partition, the priority main partition, and their corresponding adjacent partitions meet the second preset merging rule. If they do, merge the extreme value main partition, the priority main partition, and their corresponding adjacent partitions as areas to be merged to obtain the target emission area. If they do not meet the rule, merge the extreme value main partition, the priority main partition, and their corresponding adjacent partitions as the target emission area. The second preset merging rule includes: the difference between the average pixel brightness of the extreme value main partition or the priority main partition and the adjacent partitions is less than the second average threshold; the variance of the pixel brightness of the extreme value main partition or the priority main partition and the adjacent partitions is less than the second variance threshold; and the maximum pixel brightness difference between the extreme value main partition or the priority main partition and the adjacent partitions is less than the second extreme value threshold. Based on the pixel emission parameters of the corresponding regions to be merged in the target emission region, grayscale control data for each target emission region is obtained, including: Based on the pixel brightness of each region to be merged within each target luminous region, the overall average pixel brightness and maximum pixel brightness value of the target luminous region are statistically obtained. Based on the pixel brightness variance of each region to be merged within the target luminous region, weighting coefficients are set for the mean pixel brightness and the maximum pixel brightness of the target luminous region. The weighting coefficient of the mean pixel brightness is negatively correlated with the pixel brightness variance, and the weighting coefficient of the maximum pixel brightness is positively correlated with the pixel brightness variance. The region fusion brightness value of the target luminous area is obtained by weighted fusion based on the average pixel brightness, the maximum pixel brightness and their corresponding weight coefficients. Based on the region fusion brightness value and the region pixel brightness variance, the initial grayscale value of the target luminous region is obtained through a preset nonlinear mapping curve; Based on the pixel brightness distribution characteristics of the target luminous region, the number of local bright spots and local dark spots in the target luminous region are counted respectively. The initial grayscale value is fine-tuned based on the number of local bright spots and local dark spots to obtain the target grayscale value. This includes: when the proportion of local bright spots is higher than a first abnormal threshold, the initial grayscale value of the target luminous area is lowered by a preset coefficient, and the adjustment range increases with the increase of the proportion of local bright spots and the concentration of local bright spot distribution; when the proportion of local dark spots is higher than a second abnormal threshold, the initial grayscale value of the target luminous area is raised by a preset coefficient, and the adjustment range increases with the increase of the proportion of local dark spots and the concentration of local dark spot distribution; the adjusted grayscale value is limited by preset maximum and minimum grayscale values ​​to obtain the target grayscale value. Based on the target grayscale value, obtain the grayscale control data; The grayscale control data is converted to obtain the corresponding serial data signal; Based on the serial data signal and the synchronous clock signal, each of the light-emitting areas is controlled to display the image to be displayed.

2. The driving control method for a large-size curved surface partitioned dimming backlight module according to claim 1, characterized in that, The optical film assembly comprises, from top to bottom, a first brightness enhancement film, a second brightness enhancement film, a light diffusion film, and a beam splitting film, which are bonded together by adhesive.

3. The driving control method for a large-size curved surface partitioned dimming backlight module according to claim 1, characterized in that, The driving circuit includes: The area power supply control module includes several switching devices for controlling the power supply to the light-emitting area. Each switching device is connected to the power supply circuit of a light-emitting area and is used to selectively switch the power supply on and off according to the area control signal. The multi-channel constant current drive module includes multiple cascaded constant current drive chips. Each constant current drive chip has multiple constant current output channels, which are connected to multiple LED light-emitting units respectively, for driving each LED light-emitting unit with constant current output. The interface and signal buffer module is used to receive serial data signals and clock signals, process the serial data signals and clock signals only, and send them sequentially to the constant current driver chip. The temperature detection module is used to collect the operating temperature of the light-emitting array in real time and generate a temperature feedback signal. The regional power supply control module turns the power supply of each light-emitting area on or off according to the temperature feedback signal and the regional control signal. The multi-channel constant current drive module adjusts the brightness of the LED light-emitting unit according to the serial data signal.

4. The driving control method for a large-size curved surface partitioned dimming backlight module according to claim 3, characterized in that, The constant current driver chip includes a serial data input terminal, a serial data output terminal, a clock input terminal, a clock output terminal, and multiple constant current output terminals; The serial data output terminal is connected to the serial data input terminal of the next constant current driver chip, and the clock output terminal is connected to the clock input terminal of the next constant current driver chip, so as to form a serial data link and a clock link through cascading. All constant current output terminals of each constant current driver chip are directly connected to the input terminals of the LED light-emitting units in the corresponding light-emitting area. The serial data link and the clock link are used to synchronously drive the grayscale of all LED light-emitting units in the light-emitting array.

5. The driving control method for a large-size curved surface partitioned dimming backlight module according to claim 4, characterized in that, The constant current output terminals of the constant current driver chip are connected in parallel to one end of one of the multiple LED light-emitting units in the corresponding light-emitting area. The other end of the LED light-emitting unit is connected to the area power supply bus controlled by the corresponding switching device in the area power supply control module in a series or parallel manner according to the area. The LED light-emitting units in each light-emitting area share the common area power supply bus allocated by the area power supply control module.

6. The driving control method for a large-size curved surface partitioned dimming backlight module according to claim 3, characterized in that, The interface and signal buffer module includes: a first logic buffer, a second logic buffer, and multiple transient suppression diodes, wherein: The first logic buffer is used to receive the serial data signal sent by the host controller. Its input terminal is connected to the serial data output terminal from the host controller, and its output terminal is connected to the serial data input terminal of the first-stage constant current drive chip in the multi-channel constant current drive module. It is used to perform threshold shaping on the serial data signal. The second logic buffer is used to receive the clock signal sent by the host controller. Its input is connected to the clock output of the host controller, and its output is connected to the clock input of the first-stage constant current drive chip in the multi-channel constant current drive module. It is used to perform impedance matching and amplitude amplification on the clock signal. Multiple transient suppression diodes are connected in series between the host controller and the input terminal of the first logic buffer, and between the host controller and the input terminal of the second logic buffer, to suppress external electrostatic surges and overvoltage interference.

7. The driving control method for a large-size curved surface partitioned dimming backlight module according to claim 3, characterized in that, In the area power supply control module, the control terminal of each of the switching devices is connected to a constant current output channel in the multi-channel constant current drive module. The drain of the switching device is connected to the common power supply, and the source is connected to the power circuit of the corresponding light-emitting area. This is used to turn on the switching device when the constant current drive module outputs a corresponding drive signal, thereby applying the voltage of the common power bus to the corresponding light-emitting area. When the constant current drive module stops outputting the corresponding drive signal, the switching device is turned off to cut off the power supply circuit of the corresponding light-emitting area.

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