Brightness control method and apparatus, display device, and storage medium

Abstract

The application provides a brightness control method and device, a display device and a storage medium. The method comprises: obtaining a target display area in a display panel, determining the area proportion of the target display area in the display panel; determining a target driving current value according to the area proportion; and performing brightness control on the target display area according to the target driving current value. By identifying the target display area requiring brightness control in the display panel and calculating the area proportion thereof, the adjustment of the driving current can be matched with the spatial distribution characteristics of the picture content, and the driving energy can be finely distributed, so that the light emitting potential of the display panel can be fully tapped under the limited thermal management constraint. Thus, the different display areas can be differentially controlled in brightness, the optimization balance between the brightness performance and the reliability of the display panel can be achieved, the steady-state peak brightness performance of the display panel can be improved under the controllable cost, and the picture quality effect can be enhanced.

Description

Technical Field

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

[0002] MiniLED (Mini Light Emitting Diode) TVs, with their backlight zoning capabilities, can achieve higher brightness and contrast, and have become the mainstream technology in the high-end display market in recent years.

[0003] For the sake of reliability in ensuring stable long-term illumination of the LED (Light Emitting Diode) chips in MiniLED TVs, existing technologies typically employ a uniform and conservative drive current value to power the LED chips across all display windows. Under this design, when the displayed area is a smaller window (e.g., 2%, 5%), the actual junction temperature of the LED chips is far below their rated upper limit, resulting in underutilization of their luminous potential and a significant room for improvement in steady-state peak brightness. Summary of the Invention

[0004] The purpose of this application is to provide a brightness control method, apparatus, display device, and storage medium to solve the technical problem in the prior art where the use of a uniform driving current to drive all display windows results in the underutilization of the luminous potential of LED beads in small windows and the existence of room for improvement in steady-state peak brightness. The specific technical solution is as follows: In a first aspect of this application, a brightness control method is provided, the method comprising: Obtain the target display area in the display panel, and determine the area ratio of the target display area in the display panel; The target drive current value is determined based on the area ratio. The brightness of the target display area is controlled according to the target driving current value.

[0005] In an optional implementation, determining the target drive current value based on the region proportion includes: Obtain the preset driving relationship; The reference drive current value that matches the region proportion in the preset drive relationship is used as the target drive current value.

[0006] In an optional implementation, the preset driving relationship is generated in the following manner: Obtain a window ratio sequence, wherein the window ratio sequence includes multiple different window ratio values; Determine the reference drive current value corresponding to each of the aforementioned window ratio values; The preset driving relationship is generated based on each window ratio value and its corresponding reference driving current value.

[0007] In an optional implementation, determining the reference drive current value corresponding to each of the window scaling values ​​includes: For any of the window scale values, determine the test window corresponding to the window scale value in the display panel: Obtain a preset initial drive current value, iteratively execute the following steps until the junction temperature corresponding to the test window reaches a preset first junction temperature threshold, and use the current drive current value as the reference drive current value corresponding to the window ratio value: The current drive current value is determined based on the preset initial drive current value and / or the target drive current value; Obtain the solder joint temperature of the light-emitting module corresponding to the test window under the current driving current value; The junction temperature corresponding to the test window is determined based on the solder joint temperature and the current drive current value. Based on the current driving current value and the preset growth step size, determine the target driving current value for the next iteration.

[0008] In an optional implementation, determining the junction temperature corresponding to the test window based on the solder pad temperature and the current drive current value includes: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the test window and the operating voltage of the light-emitting module; The product of the thermal resistance coefficient, the operating voltage, and the current drive current value is used as the temperature increment. The sum of the temperature increment and the solder joint temperature is determined as the junction temperature corresponding to the test window.

[0009] In an optional implementation, after determining the target drive current value, the method further includes: Obtain the current solder joint temperature of the light-emitting module corresponding to the target display area; Based on the current solder joint temperature and the target driving current value, predict the expected junction temperature of the light-emitting module under the drive of the target driving current value; If the expected junction temperature is greater than the preset second junction temperature threshold, then the corrected drive current value is determined based on the preset second junction temperature threshold and the current solder joint temperature. The step of controlling the brightness of the target display area according to the target driving current value includes: controlling the brightness of the target display area according to the corrected driving current value.

[0010] In an optional implementation, predicting the expected junction temperature of the light-emitting module under the target driving current value, based on the current solder pad temperature and the target driving current value, includes: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module; The product of the thermal resistance coefficient, the current voltage, and the target drive current value is used as the estimated temperature increment; The expected junction temperature is determined by summing the estimated temperature increment and the current solder joint temperature.

[0011] In an optional implementation, determining the corrected drive current value based on the preset second junction temperature threshold and the current solder joint temperature includes: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module; Determine the difference between the preset second junction temperature threshold and the current solder joint temperature; Determine the product of the thermal resistance coefficient and the current voltage of the light-emitting module; The ratio of the difference to the product is determined as the corrected drive current value.

[0012] In an optional implementation, generating the preset driving relationship based on each window scaling value and its corresponding reference driving current value includes: For any of the window ratio values, a corresponding relationship curve is generated by fitting the window ratio value as the horizontal axis and the reference drive current value corresponding to the window ratio value as the vertical axis, and the corresponding relationship curve is used as the preset drive relationship. Alternatively, the window scaling value can be associated with the reference drive current value corresponding to the window scaling value to generate the preset drive relationship.

[0013] In an optional implementation, the method further includes: During the process of controlling the brightness of the target display area according to the target driving current value, the current solder joint temperature of the light-emitting module corresponding to the target display area is monitored. If the current solder joint temperature exceeds a preset solder joint temperature threshold, the target drive current value is reduced.

[0014] In a second aspect of this application, a brightness control device is also provided, the device comprising: The area proportion determination module is used to obtain the target display area in the display panel and determine the area proportion of the target display area in the display panel. The target drive current value determination module is used to determine the target drive current value based on the area proportion. The brightness control module is used to control the brightness of the target display area according to the target driving current value.

[0015] In a third aspect of the embodiments of this application, a display device is also provided, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in a memory, it implements the brightness control method described in any one of the first aspects above.

[0016] In a fourth aspect of the embodiments of this application, a storage medium is also provided, wherein the storage medium stores instructions that, when executed on a computer, cause the computer to perform any of the brightness control methods described in the first aspect above.

[0017] In a fifth aspect of the embodiments of this application, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to perform any of the brightness control methods described in the first aspect above.

[0018] The technical solution provided in this application obtains the target display area in the display panel, determines the area ratio of the target display area in the display panel, determines the target driving current value based on the area ratio, and controls the brightness of the target display area according to the target driving current value. This technical solution, by identifying the target display area that currently requires brightness control in the display panel and calculating its area ratio, enables the adjustment of the driving current to match the spatial distribution characteristics of the screen content, thereby finely allocating driving energy and fully exploiting the luminous potential of the display panel under limited thermal management constraints. At the same time, since the determination of the target driving current is based on dynamic adjustment of the area ratio, compared with the existing technology of driving all windows with a single fixed current, it can adaptively adjust the driving intensity according to the thermal characteristics differences under different window ratios. This can reduce the situation where the hardware capabilities are not fully utilized under small windows, and avoid the situation where the current exceeds the heat dissipation safety boundary due to excessive current under large windows. Thus, it can realize differentiated brightness control for different display areas, achieve an optimized balance between brightness performance and display panel reliability, improve the steady-state peak brightness performance of the display panel under the premise of controllable cost, and thus enhance the image quality. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 A schematic diagram illustrating the implementation process of a brightness control method provided in this application embodiment; Figure 2 A schematic diagram illustrating the implementation process of a method for determining a target driving current value provided in an embodiment of this application; Figure 3 A schematic diagram illustrating the implementation process of a drive current verification method provided in this application embodiment; Figure 4 This is a schematic diagram of the structure of a brightness control device provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0025] The brightness control method provided in this application will be further explained and described below with reference to the accompanying drawings and specific embodiments. The embodiments do not constitute a limitation on the embodiments of the present invention.

[0026] To address the technical problem in existing technologies where the use of a uniform driving current to drive all display windows results in the underutilization of the luminous potential of LED beads in small windows and room for improvement in steady-state peak brightness, this application provides a brightness control method. This method involves obtaining the target display area in the display panel, determining the area ratio of the target display area in the display panel, determining the target driving current value based on the area ratio, and controlling the brightness of the target display area according to the target driving current value.

[0027] This technical solution identifies the target display area requiring brightness control within the display panel and calculates its area proportion. This allows the adjustment of the driving current to match the spatial distribution characteristics of the screen content, thereby finely allocating driving energy and fully exploiting the luminous potential of the display panel under limited thermal management constraints. Simultaneously, since the determination of the target driving current is based on dynamic adjustment of the area proportion, compared to the existing method of driving all windows with a single fixed current, it can adaptively adjust the driving intensity according to the thermal characteristics differences under different window proportions. This reduces the underutilization of hardware capabilities in small windows and avoids situations where excessive current exceeds the heat dissipation safety boundary in large windows. Thus, differentiated brightness control for different display areas can be achieved, optimizing the balance between brightness performance and display panel reliability. Under controllable cost conditions, this improves the steady-state peak brightness performance of the display panel, thereby enhancing image quality.

[0028] like Figure 1 The diagram shown is a schematic representation of the implementation process of a brightness control method provided in this application, which may specifically include the following steps: S101, Obtain the target display area in the display panel and determine the area ratio of the target display area in the display panel.

[0029] The aforementioned display panel refers to a display device used to display images or video content. It can be any one of a liquid crystal display panel, an organic light-emitting diode display panel, or a micro light-emitting diode display panel. This application embodiment does not limit this.

[0030] The aforementioned target display area refers to the area in the display panel that requires brightness control. This area can be a bright area in the display screen that needs local brightness enhancement (such as a bright area of ​​the sun, lightning, explosion, or lights in a scene), a specific area selected by the user through interactive operation, or an area that needs brightness adjustment based on preset rules. The preset rules may include: defining the pixel area in the image frame whose brightness value exceeds a preset brightness threshold as the target display area; or defining the continuous area composed of the top N% of pixels in the image frame whose brightness value ranks as the target display area; or defining the edge-enclosed area in the image frame whose contrast exceeds a preset contrast threshold as the target display area; or, based on the brightness distribution characteristics of the pixels in the image frame, defining the connected area containing the highest brightness value and whose area proportion is within a preset range as the target display area.

[0031] The aforementioned area percentage refers to the ratio between the area of ​​the target display area and the total display area of ​​the display panel. For example, if the area of ​​the target display area is A_target and the total display area of ​​the display panel is A_total, then the area percentage R = (A_target / A_total) × 100%.

[0032] In this embodiment, the target display area in the display panel can be obtained, and the area ratio of the target display area in the display panel can be determined. This step is used to identify the spatial area in the current image that needs brightness control and its size, providing a basis for subsequent fine adjustment of the driving current.

[0033] Specifically, the proportion of the target display area in the display panel can be determined by performing content analysis on the input image frame. For example, the image frame to be displayed can be acquired, the area of ​​the continuous region with the highest brightness value in the image frame can be calculated, and the proportion of this area to the total area of ​​the entire image frame can be calculated to obtain the region proportion.

[0034] As an optional embodiment, the brightness values ​​of each pixel in the current image frame to be displayed can be counted, and pixels whose brightness values ​​exceed a preset brightness threshold (such as 80% of the maximum brightness value) can be identified as high-brightness pixels. The connected region composed of continuously distributed high-brightness pixels can be identified as the target display area. The number of pixels contained in the connected region can be counted, and the ratio of the number of pixels to the total number of pixels in the image frame can be identified as the area proportion.

[0035] As another alternative embodiment, the target display area can also be determined based on the brightness histogram distribution of the image frame, specifically the pixel area with the highest brightness value (e.g., the top 5%).

[0036] In addition, the process of acquiring the target display area may include steps of region filtering or merging. That is, when there are multiple scattered bright areas in an image frame, each bright area can be used as an independent target display area, or multiple bright areas that are close to each other can be merged into one target display area.

[0037] S102, determine the target drive current value based on the area proportion.

[0038] The aforementioned target driving current value refers to the current value used to drive the light-emitting module (such as LED beads) corresponding to the target display area. This current value directly determines the luminous brightness of the light-emitting module. The target driving current value can be a steady-state DC current value or an equivalent average current value controlled by pulse width modulation dimming.

[0039] In this embodiment of the application, the target driving current value can be determined based on the area proportion.

[0040] The specific method for determining the target drive current value based on the region proportion will be explained below. Figure 2 The process shown will be explained in detail here.

[0041] S103 controls the brightness of the target display area according to the target driving current value.

[0042] In this embodiment, the brightness of the target display area is controlled according to the target driving current value. Specifically, the target driving current value can be sent to the driving circuit, which then provides driving current to the light-emitting module corresponding to the target display area, causing the light-emitting module in that area to emit light of a corresponding brightness.

[0043] The driving circuit may include a constant current driving chip, which can provide a stable driving current to the corresponding light-emitting module (such as the LED beads corresponding to the target display area) based on the received target driving current value. Alternatively, the average driving current of the LED beads can be changed by adjusting the duty cycle of the pulse width modulation signal, thereby achieving brightness control.

[0044] Understandably, while controlling the brightness of the target display area according to the target driving current value, other areas of the display panel besides the target display area can be displayed at normal brightness, or the brightness can be reduced or the backlight turned off as needed to further highlight the brightness performance of the target display area. Based on the above description of the technical solution provided in the embodiments of this application, the target display area in the display panel is obtained, the area ratio of the target display area in the display panel is determined, the target driving current value is determined according to the area ratio, and the brightness of the target display area is controlled according to the target driving current value.

[0045] This technical solution identifies the target display area requiring brightness control within the display panel and calculates its area proportion. This allows the adjustment of the driving current to match the spatial distribution characteristics of the screen content, thereby finely allocating driving energy and fully exploiting the luminous potential of the display panel under limited thermal management constraints. Simultaneously, since the determination of the target driving current is based on dynamic adjustment of the area proportion, compared to the existing method of driving all windows with a single fixed current, it can adaptively adjust the driving intensity according to the thermal characteristics differences under different window proportions. This reduces the underutilization of hardware capabilities in small windows and avoids situations where excessive current exceeds the heat dissipation safety boundary in large windows. Thus, differentiated brightness control for different display areas can be achieved, optimizing the balance between brightness performance and display panel reliability. Under controllable cost conditions, this improves the steady-state peak brightness performance of the display panel, thereby enhancing image quality.

[0046] like Figure 2 The diagram shown is a schematic representation of the implementation flow of a method for determining a target driving current value according to an embodiment of this application. Figure 2 exist Figure 1 Based on this, the paper describes in detail how to determine the target drive current value according to the region proportion, which may include the following: S201, obtain the preset drive relationship.

[0047] In this embodiment, a preset driving relationship can be obtained. This preset driving relationship is used to indicate the correspondence between the window ratio and the driving current value.

[0048] Specifically, the preset driving relationship can be generated in the following ways: Step 11: Obtain the window scaling sequence, which includes multiple different window scaling values.

[0049] In this embodiment, a window ratio sequence is obtained, which includes multiple different window ratio values. Each window ratio value in the window ratio sequence is used as a sampling point for subsequent testing and calibration to establish the correspondence between the window ratio and the drive current value.

[0050] For example, the window ratio values ​​in the window ratio sequence are selected from the range of 2% to 30%, and the step between adjacent window ratio values ​​is 5%. The window ratio sequence can include the following window ratio values: 2%, 5%, 10%, 15%, 20%, 25%, and 30%. Setting the sequence with 2% as the starting value, 30% as the ending value, and 5% as the step ensures calibration efficiency while covering the key range.

[0051] Step 12: Determine the reference drive current value corresponding to each window ratio value.

[0052] In this embodiment, a reference driving current value is determined for each window ratio. The reference driving current value refers to the maximum driving current value achievable while meeting thermal reliability constraints, thus maximizing the luminous potential of the light-emitting module.

[0053] Specifically, determining the reference drive current value corresponding to each window ratio can include the following steps: Step 121: For any window scale value, determine the test window corresponding to the window scale value in the display panel.

[0054] In this embodiment, a test window corresponding to any given window ratio can be determined on the display panel. The test window refers to a display area with a specific area proportion used for calibration testing. During testing, a test window with that ratio can be displayed on the display panel. This test window can be displayed as white or another bright color to ensure that the light-emitting module within the test window is at full capacity. The remaining areas can be displayed as black or at low brightness to avoid interfering with the temperature measurement of the test window.

[0055] For example, if the current window size is 5%, a white test window with an area of ​​5% will be displayed in the center area or a specified location of the display panel, while the remaining 95% of the area will be displayed in black.

[0056] Step 122: Obtain the preset initial drive current value, iteratively execute the following steps until the junction temperature corresponding to the test window reaches the preset first junction temperature threshold, and use the current drive current value as the reference drive current value corresponding to the window ratio value.

[0057] The aforementioned preset initial drive current value refers to the drive current value used by the light-emitting module during the first drive test window. This current value is a small safety value to ensure that the junction temperature of the light-emitting module does not exceed the safety limit during the initial stage of testing. For example, the preset initial drive current value can be set to 5mA or 10mA.

[0058] The aforementioned preset first junction temperature threshold refers to the maximum allowable junction temperature of the light-emitting module, that is, the highest junction temperature that the light-emitting module is allowed to reach under normal operating conditions. This threshold can be determined by the factory specifications of the light-emitting module; for example, the preset first junction temperature threshold is 125°C.

[0059] In this embodiment of the application, a preset initial drive current value can be obtained, and the following steps (i.e., steps 123 to 125) can be executed iteratively until the junction temperature corresponding to the test window reaches the preset first junction temperature threshold. The current drive current value is then used as the reference drive current value corresponding to the window ratio value.

[0060] As an optional embodiment, the preset initial drive current value can be determined based on the window ratio. Specifically, for a smaller window ratio, a relatively larger preset initial drive current value can be set because heat dissipation is better under a smaller window, and even if the initial current is slightly larger, it is not easy to overheat; for a larger window ratio, a relatively smaller preset initial drive current value can be set to avoid the initial current being too large, causing the junction temperature to quickly exceed the threshold and miss a better current value. For example, for a 2% window, the preset initial drive current value can be set to 15mA; for a 30% window, the preset initial drive current value can be set to 5mA. This can reduce the number of iterations and improve calibration efficiency. In addition, the preset initial drive current value can also be set to a uniform fixed value, which is not limited in this embodiment.

[0061] Step 123: Determine the current drive current value based on the preset initial drive current value and / or the target drive current value.

[0062] In this embodiment of the application, the current drive current value can be determined based on a preset initial drive current value and / or a target drive current value.

[0063] Specifically, in the first iteration, the current drive current value can be determined based on the preset initial drive current value. That is, the preset initial drive current value is used as the current drive current value. In subsequent iterations (such as the second or third iteration), the current drive current value can be determined based on the target drive current value. That is, the target drive current value (i.e., the target drive current value determined in the previous iteration) is used as the current drive current value.

[0064] For example, if the initial drive current value is preset to 10mA, then the current drive current value in the first iteration is 10mA. If the target drive current value determined in the previous iteration is 12mA, then the current drive current value in this iteration is 12mA.

[0065] Step 124: Obtain the solder joint temperature of the light-emitting module corresponding to the test window under the current driving current value.

[0066] In this embodiment, the solder pad temperature of the light-emitting module corresponding to the test window is obtained under the current driving current value. The solder pad temperature refers to the temperature of the pins or pads of the light-emitting module (such as an LED bead), which can be obtained in real time by a temperature detection device (such as a thermocouple, thermistor, infrared temperature sensor, or other temperature sensing element) located at the LED bead solder pad position.

[0067] Step 125: Determine the junction temperature corresponding to the test window based on the solder joint temperature and the current drive current value.

[0068] In this embodiment, the junction temperature corresponding to the test window can be determined based on the solder joint temperature and the current drive current value. Here, junction temperature refers to the temperature of the PN junction inside the light-emitting module (such as an LED chip). Specifically, determining the junction temperature corresponding to the test window based on the solder joint temperature and the current drive current value can include the following steps: Step 1251: Obtain the thermal resistance coefficient and operating voltage of the light-emitting module corresponding to the test window.

[0069] The thermal resistance coefficient of the aforementioned light-emitting module refers to the heat transfer resistance parameter between the junction temperature and the solder pad temperature of the light-emitting module, expressed in °C / W. It represents the temperature rise in the junction area relative to the solder pad temperature for every 1 watt of power consumed. This resistance is determined by factors such as the packaging structure and material properties of the light-emitting module, and can be specified according to the manufacturer's specifications. For example, a certain model of LED chip has a thermal resistance coefficient Rth of 30 °C / W, meaning that for every 1 watt increase in power consumption, the junction temperature rises by 30 °C relative to the solder pad temperature.

[0070] The operating voltage of the aforementioned light-emitting module refers to the voltage drop across the modules under normal operating conditions. This can be the rated voltage value.

[0071] In this embodiment of the application, the thermal resistance coefficient and the operating voltage of the light-emitting module corresponding to the test window can be obtained.

[0072] Step 1252: The product of thermal resistance coefficient, operating voltage and current drive current value is used as the temperature increment.

[0073] In this embodiment, the product of thermal resistance coefficient, operating voltage, and current drive current can be used as the temperature increment. The temperature increment refers to the increase in solder joint temperature relative to the junction temperature caused by the power consumption of the light-emitting module, reflecting the degree to which the power loss of the light-emitting module is converted into heat.

[0074] Specifically, the power consumption of the light-emitting module is P = V × I, where V is the operating voltage and I is the current driving current. Most of this power consumption is converted into heat, causing the junction temperature of the light-emitting module to rise relative to the solder joint temperature. According to the definition of thermal resistance, the temperature increment ΔT = Rth × P = Rth × V × I.

[0075] For example, if the thermal resistance coefficient Rth of an LED bead is 30℃ / W, the operating voltage V is 24V, and the current driving current I is 20mA (i.e., 0.02A), then the temperature increment ΔT = 30 × 24 × 0.02 = 14.4℃. That is, the junction temperature of the LED bead is 14.4℃ higher than the solder joint temperature.

[0076] Step 1253: The sum of the temperature increment and the solder joint temperature is determined as the junction temperature corresponding to the test window.

[0077] In this embodiment, the sum of the temperature increment and the solder joint temperature can be determined as the junction temperature corresponding to the test window. That is, the relationship between the junction temperature and the solder joint temperature is: junction temperature = solder joint temperature + temperature increment.

[0078] For example, if the current solder joint temperature Ts is 100.6℃ and the temperature increment ΔT is 14.4℃, then the junction temperature Tj = 100.6 + 14.4 = 115.0℃.

[0079] Step 126: Determine the target driving current value for the next iteration based on the current driving current value and the preset growth step size.

[0080] In this embodiment, the target driving current value for the next iteration can be determined based on the current driving current value and the preset growth step size.

[0081] Specifically, the sum of the current driving current value and the preset growth step size can be used to determine the target driving current value for the next iteration.

[0082] For example, if the current driving current value is 20mA and the preset growth step size is 2mA, then the target driving current value for the next iteration is 22mA.

[0083] Step 13: Generate a preset driving relationship based on the ratio value of each window and its corresponding reference driving current value.

[0084] In this embodiment, a preset driving relationship can be generated based on the window ratio value and its corresponding reference driving current value.

[0085] As an optional embodiment, a preset driving relationship is generated based on each window ratio value and its corresponding reference driving current value. This can be achieved by fitting a corresponding relationship curve with the window ratio value as the horizontal axis and the corresponding reference driving current value as the vertical axis for any window ratio value, and using the corresponding relationship curve as the preset driving relationship.

[0086] As another optional embodiment, a preset driving relationship is generated based on each window ratio value and its corresponding reference driving current value. This can be achieved by associating the window ratio value with the reference driving current value corresponding to the window ratio value to generate the preset driving relationship.

[0087] It should be noted that after generating the preset driving relationship, this preset driving relationship can be burned into the storage unit of the control chip. During the actual operation of the display device, the control chip can calculate the area ratio based on the real-time screen content, and then call the preset driving relationship to quickly determine the corresponding target driving current value.

[0088] S202, the reference drive current value that matches the region proportion in the preset drive relationship is used as the target drive current value.

[0089] In this embodiment of the application, a reference drive current value that matches the region proportion in the preset drive relationship can be used as the target drive current value.

[0090] Specifically, when the preset drive relationship is a lookup table, a reference drive current value matching the region proportion can be retrieved from the lookup table. If the region proportion is exactly equal to a certain window proportion value in the lookup table, the reference drive current value corresponding to that window proportion value is directly used as the target drive current value. If the region proportion is between two adjacent window proportion values ​​in the lookup table, the corresponding reference drive current value can be calculated using linear interpolation.

[0091] When the preset driving relationship is a corresponding relationship curve, the region proportion can be substituted into the curve to directly calculate the corresponding target driving current value.

[0092] For example, if the current determined area percentage is 7%, and the preset driving relationship includes two sampling points, 5% and 10%, the reference driving current value corresponding to 5% is 22mA, and the reference driving current value corresponding to 10% is 18mA, then the target driving current value corresponding to 7% can be calculated by linear interpolation: I_target = 22 + (18-22) × (7%-5%) / (10%-5%) = 20.4mA.

[0093] For example, if the current area percentage is 2%, and the reference drive current value corresponding to 2% is found to be 28mA directly from the preset drive relationship, then this 28mA is used as the target drive current value.

[0094] Correspondingly, after determining the target drive current value in step S102 above, to ensure that the determined target drive current value will not cause the junction temperature of the light-emitting module to exceed the limit under actual working conditions, and to guarantee the reliability and service life of the light-emitting module, the rationality of the target drive current value can also be verified. For example... Figure 3 The diagram shown is a schematic representation of the implementation process of a drive current verification method provided in this application. Figure 3 exist Figure 1 Based on this, a detailed description is provided on how to perform a safety verification of the target drive current value, which may include the following: S301, obtain the current solder joint temperature of the light-emitting module corresponding to the target display area.

[0095] In this embodiment, the current solder joint temperature of the light-emitting module corresponding to the target display area can be obtained.

[0096] Specifically, the current solder joint temperature (Ts_cur) can be collected in real time by a temperature detection device located at the solder joint of the light-emitting module. The temperature detection device can include, but is not limited to, thermocouples, thermistors, infrared temperature sensors, or other components with temperature sensing capabilities. This device continuously collects the solder joint temperature at a preset sampling frequency (e.g., once per second or once per frame) during the operation of the display device and sends the collected temperature data to the control chip. The current solder joint temperature reflects the actual thermal state of the light-emitting module under its current operating condition and is an important basis for determining whether the target drive current value is safe.

[0097] S302, based on the current solder joint temperature and the target driving current value, predicts the expected junction temperature of the light-emitting module under the drive of the target driving current value.

[0098] In this embodiment, the expected junction temperature of the light-emitting module under the target driving current value can be predicted based on the current solder joint temperature and the target driving current value. The expected junction temperature refers to the junction temperature that the light-emitting module may reach when driven according to the target driving current value.

[0099] Specifically, predicting the expected junction temperature of the light-emitting module under the target driving current value, based on the current solder pad temperature and the target driving current value, may include the following steps: Step 21: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module.

[0100] In this embodiment of the application, the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module are obtained.

[0101] For example, the thermal resistance coefficient Rth of the light-emitting module is 30℃ / W, and the current operating voltage V_cur is 24V.

[0102] Step 22: The product of the thermal resistance coefficient, the current voltage, and the target drive current value is used as the estimated temperature increment.

[0103] In this embodiment, the product of the thermal resistivity, the current voltage, and the target driving current value can be used as the estimated temperature increment. The estimated temperature increment characterizes the increase in junction temperature of the light-emitting module relative to the solder joint temperature under the target driving current value.

[0104] Specifically, the estimated temperature increment ΔT_pred = Rth × V_cur × I_target, where I_target is the target drive current value. This calculation method is the same as the temperature increment calculation method in step 1252 above, the difference being that the target drive current value is used here instead of the current drive current value, the purpose of which is to predict the junction temperature that may be reached at this current value.

[0105] For example, if Rth = 30℃ / W, V_cur = 24V, and I_target = 28mA (0.028A), then the estimated temperature increment ΔT_pred = 30 × 24 × 0.028 = 20.16℃.

[0106] Step 23: The sum of the estimated temperature increment and the current solder joint temperature is determined as the expected junction temperature.

[0107] In the embodiments of this application, the sum of the estimated temperature increment and the current solder joint temperature can be determined as the expected junction temperature.

[0108] For example, if the current solder joint temperature Ts_cur is 90℃ and the estimated temperature increment ΔT_pred is 20.16℃, then the expected junction temperature Tj_pred = 90 + 20.16 = 110.16℃.

[0109] S303 If the expected junction temperature is greater than the preset second junction temperature threshold, then determine the correction drive current value based on the preset second junction temperature threshold and the current solder joint temperature.

[0110] In this embodiment, if the expected junction temperature is greater than a preset second junction temperature threshold, it indicates that driving the module according to the target driving current value may cause the junction temperature to exceed the safe upper limit. Therefore, the target driving current value needs to be lowered. Thus, the corrected driving current value needs to be determined based on the preset second junction temperature threshold and the current solder joint temperature. The preset second junction temperature threshold and the aforementioned preset first junction temperature threshold can be the same value (both are the maximum allowable junction temperature Tj_max of the light-emitting module, such as 125℃), or they can be different values. For example, the preset second junction temperature threshold can be slightly lower than the preset first junction temperature threshold to reserve a certain safety margin. For example, if the preset first junction temperature threshold is 125℃, the preset second junction temperature threshold can be set to 120℃ or 115℃. This embodiment does not limit this.

[0111] Specifically, the correction drive current value is determined based on the preset second junction temperature threshold and the current solder joint temperature, which may include the following steps: Step 31: Obtain the thermal resistance coefficient and the current voltage of the light-emitting module corresponding to the target display area.

[0112] In this embodiment of the application, the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module can be obtained.

[0113] Step 32: Determine the difference between the preset second junction temperature threshold and the current solder joint temperature.

[0114] In this embodiment, a difference between a preset second junction temperature threshold and the current solder joint temperature is determined. This difference represents the maximum permissible increase in junction temperature at the current solder joint temperature.

[0115] For example, if the preset second junction temperature threshold Tj_th2 is 125℃ and the current solder joint temperature Ts_cur is 90℃, then the difference ΔT_allow = 125 - 90 = 35℃.

[0116] Step 33: Determine the product of the thermal resistance coefficient and the current voltage of the light-emitting module.

[0117] In this embodiment, the product of the thermal resistivity and the current voltage of the light-emitting module is determined. This product represents the temperature rise caused by a unit current (i.e., 1A).

[0118] For example, if the thermal resistance coefficient Rth = 30℃ / W and the current voltage of the light-emitting module V_cur = 24V, then the product = Rth × V_cur = 30 × 24 = 720℃ / A.

[0119] Step 34: The ratio of the difference to the product is determined as the corrected drive current value.

[0120] In the embodiments of this application, the ratio of the difference to the product can be determined as the corrected drive current value.

[0121] Correspondingly, after determining the corrected drive current value, the brightness control of the target display area according to the target drive current value in step S103 can be performed according to the corrected drive current value. That is, when the target drive current value fails the safety check, the corrected drive current value is used instead of the original target drive current value to control the brightness of the light-emitting module, thereby achieving the highest possible brightness output while ensuring that the junction temperature of the light-emitting module does not exceed the safety limit.

[0122] In another embodiment of this application, if the expected junction temperature is less than or equal to a preset second junction temperature threshold, it means that it is safe to drive the light-emitting module according to the target driving current value, and the junction temperature will not exceed the safety limit. Therefore, there is no need to correct the target driving current value, and the above step S103 can be directly executed to control the brightness of the target display area with the target driving current value.

[0123] Corresponding to the above method embodiments, this application also provides a brightness control device, such as... Figure 4 As shown, the device may include a region occupancy determination module 401, a target drive current value determination module 402, and a brightness control module 403.

[0124] The area proportion determination module 401 is used to obtain the target display area in the display panel and determine the area proportion of the target display area in the display panel. The target drive current value determination module 402 is used to determine the target drive current value based on the area proportion; The brightness control module 403 is used to control the brightness of the target display area according to the target drive current value.

[0125] This application also provides a display device, such as... Figure 5 As shown, it includes a processor 501, a communication interface 502, a memory 503, and a communication bus 504, wherein the processor 501, the communication interface 502, and the memory 503 communicate with each other through the communication bus 504. Memory 503 is used to store computer programs; In one embodiment of this application, when the processor 501 executes a program stored in the memory 503, it performs the following steps: Obtain the target display area in the display panel and determine the area ratio of the target display area in the display panel; determine the target driving current value based on the area ratio; control the brightness of the target display area according to the target driving current value.

[0126] The communication bus mentioned in the above display device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0127] The communication interface is used for communication between the aforementioned display device and other devices.

[0128] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0129] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0130] In another embodiment provided in this application, a storage medium is also provided, which stores instructions that, when run on a computer, cause the computer to execute any of the brightness control methods described in the above embodiments.

[0131] In another embodiment provided in this application, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute any of the brightness control methods described in the above embodiments.

[0132] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a storage medium or transmitted from one storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (SSD)).

[0133] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0134] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0135] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the protection scope of this application.

Claims

1. A brightness control method, characterized in that, The method includes: Obtain the target display area in the display panel and determine the area ratio of the target display area in the display panel; The target drive current value is determined based on the area ratio. The brightness of the target display area is controlled according to the target driving current value.

2. The method according to claim 1, characterized in that, Determining the target drive current value based on the region proportion includes: Obtain the preset driving relationship; The reference drive current value that matches the region proportion in the preset drive relationship is used as the target drive current value.

3. The method according to claim 2, characterized in that, The preset driving relationship is generated in the following way: Obtain a window scaling sequence, wherein the window scaling sequence includes multiple different window scaling values; Determine the reference drive current value corresponding to each of the aforementioned window ratio values; The preset driving relationship is generated based on each window ratio value and its corresponding reference driving current value.

4. The method according to claim 3, characterized in that, Determining the reference drive current value corresponding to each of the window ratio values ​​includes: For any of the window scale values, determine the test window corresponding to the window scale value in the display panel: Obtain a preset initial drive current value, iteratively execute the following steps until the junction temperature corresponding to the test window reaches a preset first junction temperature threshold, and use the current drive current value as the reference drive current value corresponding to the window ratio value: The current drive current value is determined based on the preset initial drive current value and / or the target drive current value; Obtain the solder joint temperature of the light-emitting module corresponding to the test window under the current driving current value; The junction temperature corresponding to the test window is determined based on the solder joint temperature and the current drive current value. Based on the current driving current value and the preset growth step size, determine the target driving current value for the next iteration.

5. The method according to claim 4, characterized in that, The step of determining the junction temperature corresponding to the test window based on the solder joint temperature and the current drive current value includes: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the test window and the operating voltage of the light-emitting module; The product of the thermal resistance coefficient, the operating voltage, and the current drive current value is used as the temperature increment. The sum of the temperature increment and the solder joint temperature is determined as the junction temperature corresponding to the test window.

6. The method according to claim 1, characterized in that, After determining the target drive current value, the method further includes: Obtain the current solder joint temperature of the light-emitting module corresponding to the target display area; Based on the current solder joint temperature and the target driving current value, predict the expected junction temperature of the light-emitting module under the drive of the target driving current value; If the expected junction temperature is greater than the preset second junction temperature threshold, then the corrected drive current value is determined based on the preset second junction temperature threshold and the current solder joint temperature. The step of controlling the brightness of the target display area according to the target driving current value includes: controlling the brightness of the target display area according to the corrected driving current value.

7. The method according to claim 6, characterized in that, The step of predicting the expected junction temperature of the light-emitting module under the target driving current value based on the current solder joint temperature and the target driving current value includes: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module; The product of the thermal resistance coefficient, the current voltage, and the target drive current value is used as the estimated temperature increment; The expected junction temperature is determined by summing the estimated temperature increment and the current solder joint temperature.

8. The method according to claim 6, characterized in that, The step of determining the corrected drive current value based on the preset second junction temperature threshold and the current solder joint temperature includes: Obtain the thermal resistance coefficient of the light-emitting module corresponding to the target display area and the current voltage of the light-emitting module; Determine the difference between the preset second junction temperature threshold and the current solder joint temperature; Determine the product of the thermal resistance coefficient and the current voltage of the light-emitting module; The ratio of the difference to the product is determined as the corrected drive current value.

9. The method according to claim 3, characterized in that, The step of generating the preset driving relationship based on each window ratio value and its corresponding reference driving current value includes: For any of the window ratio values, a corresponding relationship curve is generated by fitting the window ratio value as the horizontal axis and the reference drive current value corresponding to the window ratio value as the vertical axis, and the corresponding relationship curve is used as the preset drive relationship. Alternatively, the window scaling value can be associated with the reference drive current value corresponding to the window scaling value to generate the preset drive relationship.

10. The method according to claim 1, characterized in that, The method further includes: During the process of controlling the brightness of the target display area according to the target driving current value, the current solder joint temperature of the light-emitting module corresponding to the target display area is monitored. If the current solder joint temperature exceeds a preset solder joint temperature threshold, the target drive current value is reduced.

11. A brightness control device, characterized in that, The device includes: The area proportion determination module is used to obtain the target display area in the display panel and determine the area proportion of the target display area in the display panel. The target drive current value determination module is used to determine the target drive current value based on the area proportion. The brightness control module is used to control the brightness of the target display area according to the target driving current value.

12. A display device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method described in any one of claims 1-10.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-10.

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