Backlight control method, display chip and backlight module

Abstract

This invention discloses a backlight control method, a display chip, and a backlight module. The method includes: determining the current temperature state of a target light-emitting unit connected to a target output channel based on dimming data corresponding to a target output channel in multiple first image frames displayed within a first time period, wherein the target output channel is any one of multiple output channels of a dimmer; determining target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame; and controlling the backlight brightness of the target light-emitting unit according to the target dimming data. Since the determination of the current temperature state depends on multiple dimming data within a time period, using it for temperature compensation can reduce the damage caused by high temperatures to the light-emitting unit and effectively extend the service life of the light-emitting unit.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a backlight control method, a display chip, and a backlight module. Background Technology

[0002] In recent years, with the rapid development of image display technology, display devices have gradually moved towards larger sizes and higher performance to provide users with a better visual experience. However, in larger display devices, the increased number of backlights, dimmers, and dimmer controllers leads to higher component density on the backlight board, resulting in poorer heat dissipation for various components. Furthermore, due to users' increasing demands for high dynamic range (HDR) in display devices, the data processing volume and current consumption of the display devices will increase. All of these factors cause the display device's temperature to rise rapidly and become very high. This high temperature can damage the backlight, resulting in lower actual luminous brightness and a shortened lifespan.

[0003] To mitigate the impact of high temperatures on display devices, existing technologies typically incorporate temperature sensors to monitor the backlight temperature and control the backlight to stop emitting light at a specific temperature. However, this approach cannot fundamentally prevent high-temperature damage to the backlight, thus failing to extend its lifespan. Furthermore, the need for multiple additional temperature sensors complicates the backlight unit's structure and the backlight panel's manufacturing process, thereby increasing the display device's manufacturing cost. Summary of the Invention

[0004] This invention provides a backlight control method, a display chip, and a backlight module, which can solve the problem of continuous high temperature in existing display devices damaging the light-emitting unit, resulting in reduced luminous efficiency and shortened lifespan of the light-emitting unit, without the need to add a temperature sensor.

[0005] In a first aspect, embodiments of the present invention provide a backlight control method, comprising:

[0006] The current temperature state of the target light-emitting unit is determined based on the dimming data corresponding to the target output channel in multiple first image frames.

[0007] Based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame, target dimming data is determined, and the backlight brightness of the target light-emitting unit is controlled according to the target dimming data;

[0008] Wherein, the plurality of first image frames are a plurality of image frames that have been displayed within a first time period, the target output channel is any one of the plurality of output channels of the dimmer, and the target light-emitting unit is a light-emitting unit connected to the target output channel.

[0009] The backlight control method provided in this invention can predict the current temperature state of the target light-emitting unit using multiple dimming data corresponding to the target output channel over a period of time, and then use the predicted current temperature state to perform temperature compensation on the dimming data transmitted to the target light-emitting unit. Since no additional temperature sensor is required, it can effectively reduce the development cost of the device. Furthermore, because the determination of the current temperature state depends on multiple dimming data of the target output channel over a period of time, the impact of continuous temperature increases on the target light-emitting unit can be considered. Therefore, performing temperature compensation based on the current temperature state and using the supplemented dimming data for backlight control can mitigate the damage caused by high temperatures to the light-emitting unit and effectively extend its lifespan. Moreover, by using multiple dimming data corresponding to each output channel to specifically compensate the light-emitting units connected to each output channel, this targeted temperature compensation method has a superior compensation effect and can effectively improve the performance of the display device.

[0010] In an optional embodiment, determining the current temperature state of the target light-emitting unit based on the dimming data corresponding to the target output channel in a plurality of first image frames includes:

[0011] The first dimming cumulative data is determined based on the dimming data corresponding to the target output channel in the plurality of first image frames;

[0012] Based on the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined.

[0013] In an optional embodiment, determining the current temperature state of the target light-emitting unit based on the first dimming cumulative data includes:

[0014] Based on the first correspondence and the first dimming cumulative data, the current temperature value of the target light-emitting unit is determined, wherein the first correspondence is used to characterize the correspondence between the dimming cumulative data and the temperature value;

[0015] Compare the preset temperature threshold with the current temperature value. If the current temperature value is greater than or equal to the preset temperature threshold, then determine that the current temperature state is a high temperature state.

[0016] If the current temperature value is less than the preset temperature threshold, then the current temperature state is determined to be a normal temperature state.

[0017] The above method uses the first correspondence and the first dimming cumulative data to predict the current temperature state of the target light-emitting unit. It can determine the current temperature state of the target light-emitting unit without adding an additional temperature sensor, and perform temperature compensation operation based on the current temperature state to reduce the impact of high temperature on the light-emitting unit and extend the life of the light-emitting unit. Moreover, since no additional temperature sensor is needed, compared with the existing technology of setting a temperature sensor for high temperature compensation, it can not change the backlight panel structure, simplify the production process, and reduce the cost of display devices.

[0018] In an optional embodiment, determining the current temperature state of the target light-emitting unit based on the first dimming cumulative data includes:

[0019] Based on the first correspondence and the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined;

[0020] The first correspondence is used to characterize the correspondence between dimming cumulative data and temperature status, and the temperature status includes at least normal temperature status and high temperature status.

[0021] The above method uses the first correspondence and the first dimming cumulative data to predict the current temperature state of the target light-emitting unit. It can determine the current temperature state of the target light-emitting unit without adding an additional temperature sensor, and perform temperature compensation operation based on the current temperature state to reduce the impact of high temperature on the light-emitting unit and extend the life of the light-emitting unit. Moreover, since no additional temperature sensor is needed, compared with the existing technology of setting a temperature sensor for high temperature compensation, it can not only avoid changing the backlight panel structure, simplify the production process, and reduce the cost of display devices.

[0022] In one alternative embodiment, an image frame corresponds to multiple dimming data, and one dimming data is used to control a light-emitting unit connected to an output channel of the dimmer.

[0023] The step of determining the first dimming cumulative data based on the dimming data corresponding to the target output channel in multiple first image frames includes:

[0024] The dimming data corresponding to the target output channel in the plurality of first image frames are accumulated to obtain the first dimming accumulated data;

[0025] The start time of the first time period is no earlier than the power-on time of the display device, and the end time of the first time period is no later than the power-off time of the display device.

[0026] In one optional embodiment, the dimming data includes current data and PWM data, and the first dimming cumulative data includes first current cumulative data and / or first PWM cumulative data;

[0027] The step of accumulating the dimming data corresponding to the target output channel in the plurality of first image frames to obtain the dimming accumulated data includes:

[0028] The current data in the dimming data corresponding to the target output channel is accumulated to obtain the first accumulated current data.

[0029] And / or, the PWM data in the dimming data corresponding to the target output channel is accumulated to obtain the first PWM accumulated data.

[0030] The above method, since the dimming data includes current data and PWM data, allows for flexible calculation methods when accumulating the dimming data corresponding to the target output channel. This allows for the accumulation of either current data, PWM data, or both simultaneously, generating first cumulative dimming data for temperature state prediction. Because the temperature prediction in this embodiment uses cumulative data, it can consider the impact of continuous temperature increases on the light-emitting unit. Therefore, high-temperature compensation based on the current temperature state predicted by the cumulative data can achieve accurate compensation with good results, effectively extending the lifespan of the light-emitting unit.

[0031] In an optional embodiment, determining the target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame includes:

[0032] When the current temperature state is determined to be a normal temperature state, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data;

[0033] When the current temperature state is determined to be a high temperature state, based on the high temperature state, the first dimming compensation data corresponding to the target unit is determined, and the dimming data corresponding to the target output channel in the current image frame is adjusted according to the first dimming compensation data to obtain the target dimming data.

[0034] In one optional embodiment, determining the first dimming compensation data corresponding to the target unit based on the high-temperature state includes:

[0035] Compare the preset duration threshold with the duration of the high-temperature state;

[0036] When it is determined that the duration of the high-temperature state is greater than the preset duration threshold, the first dimming compensation data is determined according to the second correspondence and the current temperature value of the target light-emitting unit.

[0037] The second correspondence is used to characterize the correspondence between temperature values ​​and dimming compensation data, and the current temperature value is determined based on the first dimming cumulative data.

[0038] The above method, when it is determined that the duration of the current temperature state is greater than the preset duration threshold, uses the second correspondence to extract the first dimming compensation data corresponding to the target light-emitting unit, so as to perform high temperature compensation processing on the target light-emitting unit, reduce the damage of high temperature to the light-emitting unit, and extend the life of the light-emitting unit.

[0039] In an optional embodiment, after comparing the preset duration threshold with the duration of the high-temperature state, the method further includes:

[0040] When it is determined that the duration of the high temperature state is less than or equal to the preset duration threshold, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data.

[0041] The above method, when the duration of the high temperature state is less than or equal to the preset duration threshold, indicates that the temperature at this time causes less damage to the light-emitting unit. Therefore, the dimming data corresponding to the target output channel in the current image frame can be directly used as the target dimming data, that is, the dimming data corresponding to the target output channel in the current image frame remains unchanged, so as to ensure that a more ideal backlight brightness is provided for the image display.

[0042] In an optional embodiment, adjusting the dimming data corresponding to the target output channel in the current image frame based on the first dimming compensation data to obtain the target dimming data includes:

[0043] Using the first dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is reduced to obtain the target dimming data;

[0044] The first dimming compensation data is generated when the duration of the high-temperature state exceeds a preset duration threshold.

[0045] The above method uses the first dimming compensation data to reduce the dimming data corresponding to the target output channel in the current image frame, so that the target light-emitting unit can backlight up according to the reduced dimming data. The reduction of the dimming data will lead to a decrease in the operating current or lighting frequency of the target light-emitting unit, thereby reducing the heat generated by the target light-emitting unit and the temperature of the target light-emitting unit will decrease accordingly, so as to reduce the temperature of the light-emitting unit, avoid damage to the light-emitting unit caused by continuous high temperature, and extend the service life of the light-emitting unit.

[0046] In an optional embodiment, the method further includes:

[0047] The current aging state of the target light-emitting unit is determined based on the dimming data corresponding to the target output channel in multiple second image frames, wherein the multiple second image frames are multiple image frames that have been displayed within a second time period;

[0048] The target dimming data is determined based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame.

[0049] The above method also utilizes dimming data corresponding to the target output channel in multiple second image frames to predict the current aging state of the target light-emitting unit. Based on the current aging state and the current temperature state, it performs compensation operations on the dimming data corresponding to the target output channel in the current image frame. This allows the target light-emitting unit to control its own brightness according to the compensated target dimming data, which can both reduce the phenomenon of reduced actual light emission brightness caused by the aging of the light-emitting unit and ensure that the light-emitting unit itself is not damaged, while controlling the actual light emission brightness of the light-emitting unit to be close to the theoretical light emission brightness, thus ensuring the display effect of the image and improving the performance of the display device.

[0050] In an optional embodiment, determining the current aging state of the target light-emitting unit based on the dimming data corresponding to the target output channel in a plurality of second image frames includes:

[0051] Based on the dimming data corresponding to the target output channel in the plurality of second image frames, the second dimming cumulative data is determined, wherein the starting time of the second time period is the first power-on time of the display device;

[0052] Based on the second dimming cumulative data, the current aging state of the target light-emitting unit is determined.

[0053] The above method uses second dimming cumulative data determined by dimming data corresponding to the target output channel in multiple second image frames to predict the current aging state of the target light-emitting unit. It can accurately predict the current aging state of the light-emitting unit and perform aging compensation accordingly to reduce the phenomenon of reduced actual luminous brightness caused by the aging of the light-emitting unit. While ensuring that the light-emitting unit itself is not damaged, it controls the actual luminous brightness of the light-emitting unit to be close to the theoretical luminous brightness, thereby improving the performance of the display device.

[0054] In an optional embodiment, determining the current aging state of the target light-emitting unit based on the second dimming cumulative data includes:

[0055] Based on the third correspondence and the second dimming cumulative data, the current aging state is determined, wherein the third correspondence is used to characterize the correspondence between the dimming cumulative data and the aging state of the light-emitting unit.

[0056] In an optional embodiment, determining the target dimming data based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame includes:

[0057] Based on the current temperature state, determine the first dimming compensation data corresponding to the target unit, and based on the current aging state, determine the second dimming compensation data corresponding to the target unit;

[0058] Based on the first dimming compensation data and the second dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is adjusted to obtain the target dimming data.

[0059] In one optional embodiment, determining the second dimming compensation data corresponding to the target unit based on the current aging state includes:

[0060] The second dimming compensation data is determined based on the fourth correspondence and the current aging state, wherein the fourth correspondence is used to characterize the correspondence between the aging state of the light-emitting unit and the dimming compensation data.

[0061] The above method can use the third correspondence to predict the current aging state of the target light-emitting unit, and determine the second dimming compensation data corresponding to the current aging state based on the predicted current aging state and the fourth correspondence. The dimming compensation data is then used to compensate the dimming data, so that the light-emitting unit's reduced brightness due to its own aging can be restored to normal, ensuring the HDR requirements of the display device and improving the display effect of the display device.

[0062] In one optional embodiment, the multiple output channels of the dimmer are color output channels, the first dimming cumulative data is the first dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel.

[0063] Determining the current temperature state of the target light-emitting unit based on the first dimming cumulative data includes:

[0064] Based on the target color, a first target correspondence is determined among multiple fifth correspondences, and based on the first target correspondence and the first dimming cumulative data of the target color, the current temperature state of the target light-emitting unit is determined;

[0065] The plurality of fifth correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the temperature state, wherein the temperature state includes at least a high temperature state and a normal temperature state.

[0066] The step of determining the first dimming compensation data corresponding to the target unit based on the current temperature state includes:

[0067] Compare the duration of the high-temperature state with a preset duration threshold;

[0068] When it is determined that the duration of the high temperature state is greater than the preset duration threshold, a second target correspondence is determined among multiple sixth correspondences based on the target color, and the first dimming compensation data is determined based on the second target correspondence and the current temperature value of the target light-emitting unit.

[0069] The plurality of sixth correspondences are used to characterize the correspondence between the temperature values ​​of different color light-emitting units and the dimming compensation data, and the current temperature value is determined based on the first dimming cumulative data of the target color.

[0070] In the aforementioned method, within the color backlight unit architecture, the colors of the light-emitting units connected to different output channels of the dimmer are also different; that is, the output channels of the dimmer are color output channels. In this case, for a light-emitting unit of a certain color (i.e., the target color), the current temperature state of the target light-emitting unit is predicted using the first target correspondence relationship corresponding to that color and the first cumulative data for that color. Then, the first dimming compensation data for the target light-emitting unit is determined using the second target correspondence relationship corresponding to that color, and high-temperature compensation is performed on the dimming data corresponding to the target light-emitting unit using the first dimming compensation data. Since there are different fifth and sixth correspondence relationships for different colors of the light-emitting unit, and the current temperature state and first dimming compensation data of the corresponding color light-emitting unit are predicted accordingly, targeted compensation can be performed for light-emitting units of different colors. This avoids the white balance collapse problem caused by the different reductions in brightness of light-emitting units of different colors as temperature increases, ensuring the image display effect of the display device and improving the performance of the display device.

[0071] In one optional embodiment, the multiple output channels of the dimmer are color output channels, the second dimming cumulative data is the second dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel.

[0072] Determining the current aging state of the target light-emitting unit based on the second dimming cumulative data includes:

[0073] Based on the target color, a third target correspondence is determined among multiple seventh correspondences, and the current aging state is determined based on the third target correspondence and the second dimming cumulative data of the target color;

[0074] Among them, the plurality of seventh correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the aging state of the corresponding color light-emitting unit;

[0075] The step of determining the second dimming compensation data corresponding to the target light-emitting unit based on the current aging state includes:

[0076] Based on the target color, a fourth target correspondence is determined among multiple eighth correspondences, and based on the fourth target correspondence and the current aging state, the second dimming compensation data is determined;

[0077] The plurality of eighth correspondences are used to characterize the correspondence between the aging state of different color light-emitting units and the dimming compensation data.

[0078] The above method, in the color backlight unit architecture, uses the third target correspondence relationship corresponding to the target color and the first cumulative data of the target color to predict the current aging state of the target light-emitting unit, and uses the fourth target correspondence relationship corresponding to the target color and the current aging state to determine the second dimming compensation data corresponding to the target light-emitting unit. The second dimming compensation data is used to compensate the dimming data corresponding to the target light-emitting unit in the current image frame, so that the light emission brightness of light-emitting units of different colors reduced due to their own aging is restored to normal, ensuring the HDR requirements of the display device and improving the display effect of the display device.

[0079] In a second aspect, embodiments of the present invention provide a display chip, comprising:

[0080] The state prediction module is used to determine the current temperature state of the target light-emitting unit based on the dimming data corresponding to the target output channel in multiple first image frames.

[0081] The compensation processing module is used to determine target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame, and to control the backlight brightness of the target light-emitting unit according to the target dimming data.

[0082] Wherein, the plurality of first image frames are a plurality of image frames that have been displayed within a first time period, the target output channel is any one of the plurality of output channels of the dimmer, and the target light-emitting unit is a light-emitting unit connected to the target output channel.

[0083] In an optional embodiment, the state prediction module is specifically used for:

[0084] The first dimming cumulative data is determined based on the dimming data corresponding to the target output channel in the plurality of first image frames;

[0085] Based on the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined.

[0086] In an optional embodiment, the state prediction module is specifically used for:

[0087] Based on the first correspondence and the first dimming cumulative data, the current temperature value of the target light-emitting unit is determined, wherein the first correspondence is used to characterize the correspondence between the dimming cumulative data and the temperature value;

[0088] Compare the preset temperature threshold with the current temperature value. If the current temperature value is greater than or equal to the preset temperature threshold, then determine that the current temperature state is a high temperature state.

[0089] If the current temperature value is less than the preset temperature threshold, then the current temperature state is determined to be a normal temperature state.

[0090] In an optional embodiment, the state prediction module is specifically used for:

[0091] Based on the first correspondence and the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined;

[0092] The first correspondence is used to characterize the correspondence between dimming cumulative data and temperature status, and the temperature status includes at least normal temperature status and high temperature status.

[0093] In one alternative embodiment, an image frame corresponds to multiple dimming data, and one dimming data is used to control a light-emitting unit connected to an output channel of the dimmer.

[0094] The state prediction module is specifically used for:

[0095] The dimming data corresponding to the target output channel in the plurality of first image frames are accumulated to obtain the first dimming accumulated data;

[0096] The start time of the first time period is no earlier than the power-on time of the display device, and the end time of the first time period is no later than the power-off time of the display device.

[0097] In one optional embodiment, the dimming data includes current data and PWM data, and the first dimming cumulative data includes first current cumulative data and / or first PWM cumulative data;

[0098] The state prediction module is specifically used for:

[0099] The current data in the dimming data corresponding to the target output channel is accumulated to obtain the first accumulated current data.

[0100] And / or, the PWM data in the dimming data corresponding to the target output channel is accumulated to obtain the first PWM accumulated data.

[0101] In one optional embodiment, the compensation processing module is specifically used for:

[0102] When the current temperature state is determined to be a normal temperature state, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data;

[0103] When the current temperature state is determined to be a high temperature state, based on the high temperature state, the first dimming compensation data corresponding to the target unit is determined, and the dimming data corresponding to the target output channel in the current image frame is adjusted according to the first dimming compensation data to obtain the target dimming data.

[0104] In one optional embodiment, the compensation processing module is specifically used for:

[0105] Compare the preset duration threshold with the duration of the high-temperature state;

[0106] When it is determined that the duration of the high-temperature state is greater than the preset duration threshold, the first dimming compensation data is determined according to the second correspondence and the current temperature value of the target light-emitting unit.

[0107] The second correspondence is used to characterize the correspondence between temperature values ​​and dimming compensation data, and the current temperature value is determined based on the first dimming cumulative data.

[0108] In an optional embodiment, the compensation processing module is further configured to:

[0109] When it is determined that the duration of the high temperature state is less than or equal to the preset duration threshold, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data.

[0110] In one optional embodiment, the compensation processing module is specifically used for:

[0111] Using the first dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is reduced to obtain the target dimming data;

[0112] The first dimming compensation data is generated when the duration of the high-temperature state exceeds a preset duration threshold.

[0113] In an optional embodiment, the state prediction module is further configured to: determine the current aging state of the target light-emitting unit based on the dimming data corresponding to the target output channel in a plurality of second image frames, wherein the plurality of second image frames are a plurality of image frames that have been displayed within a second time period;

[0114] The compensation processing module is further configured to: determine the target dimming data based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame.

[0115] In an optional embodiment, the state prediction module is specifically used for:

[0116] Based on the dimming data corresponding to the target output channel in multiple second image frames, the second dimming cumulative data is determined, wherein the start time of the second time period is the first power-on time of the display device;

[0117] Based on the second dimming cumulative data, the current aging state of the target light-emitting unit is determined.

[0118] In an optional embodiment, the state prediction module is specifically used for:

[0119] Based on the third correspondence and the second dimming cumulative data, the current aging state is determined, wherein the third correspondence is used to characterize the correspondence between the dimming cumulative data and the aging state of the light-emitting unit.

[0120] In one optional embodiment, the compensation processing module is specifically used for:

[0121] Based on the current temperature state, determine the first dimming compensation data corresponding to the target unit, and based on the current aging state, determine the second dimming compensation data corresponding to the target light-emitting unit;

[0122] Based on the first dimming compensation data and the second dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is adjusted to obtain the target dimming data.

[0123] In one optional embodiment, the compensation processing module is specifically used for:

[0124] The second dimming compensation data is determined based on the fourth correspondence and the current aging state, wherein the fourth correspondence is used to characterize the correspondence between the aging state of the light-emitting unit and the dimming compensation data.

[0125] In one optional embodiment, the multiple output channels of the dimmer are color output channels, the first dimming cumulative data is the first dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel.

[0126] The state prediction module is specifically used for:

[0127] Based on the target color, a first target correspondence is determined among multiple fifth correspondences, and based on the first target correspondence and the first dimming cumulative data of the target color, the current temperature state of the target light-emitting unit is determined;

[0128] The plurality of fifth correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the temperature state, wherein the temperature state includes at least a high temperature state and a normal temperature state.

[0129] The compensation processing module is specifically used for:

[0130] Compare the duration of the high-temperature state with a preset duration threshold;

[0131] When it is determined that the duration of the high temperature state is greater than the preset duration threshold, a second target correspondence is determined among multiple sixth correspondences based on the target color, and the first dimming compensation data is determined based on the second target correspondence and the current temperature value of the target light-emitting unit.

[0132] The plurality of sixth correspondences are used to characterize the correspondence between the temperature values ​​of different color light-emitting units and the dimming compensation data, and the current temperature value is determined based on the first dimming cumulative data of the target color.

[0133] In one optional embodiment, the multiple output channels of the dimmer are color output channels, the second dimming cumulative data is the second dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel.

[0134] The state prediction module is specifically used for:

[0135] Based on the target color, a third target correspondence is determined among multiple seventh correspondences, and the current aging state is determined based on the third target correspondence and the second dimming cumulative data of the target color;

[0136] Among them, the plurality of seventh correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the aging state of the corresponding color light-emitting unit;

[0137] The compensation processing module is specifically used for:

[0138] Based on the target color, a fourth target correspondence is determined among multiple eighth correspondences, and based on the fourth target correspondence and the current aging state, the second dimming compensation data is determined;

[0139] The plurality of eighth correspondences are used to characterize the correspondence between the aging state of different color light-emitting units and the dimming compensation data.

[0140] Thirdly, embodiments of the present invention provide a backlight module, comprising a plurality of light-emitting units and a display chip as described in the second aspect above, wherein:

[0141] The display chip is electrically connected to the plurality of light-emitting units;

[0142] The light-emitting unit is used to turn on the backlight according to the target dimming data it receives.

[0143] For the technical effects that the display chip disclosed in the second aspect and the backlight module disclosed in the third aspect may achieve, please refer to the above description of the technical effects that can be achieved for the first aspect or the various possible solutions in the first aspect, and will not be repeated here. Attached Figure Description

[0144] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0145] Figure 1 A schematic diagram illustrating the relationship between temperature and the lifetime of the light-emitting unit for related technologies;

[0146] Figure 2 Schematic diagrams of monochrome backlight display devices and color backlight display devices provided for related technologies;

[0147] Figure 3 A schematic diagram of a display device equipped with a temperature sensor, provided for related technologies;

[0148] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0149] Figure 5 A schematic diagram illustrating the workflow of a backlight control method provided in an embodiment of the present invention;

[0150] Figure 6 This is a schematic diagram illustrating a complete workflow for temperature compensation using a backlight control method, provided by an embodiment of the present invention.

[0151] Figure 7 This is a schematic diagram of a workflow for aging compensation using a backlight control method, provided as an embodiment of the present invention.

[0152] Figure 8 This is a schematic diagram illustrating a complete workflow for aging compensation using a backlight control method, provided by an embodiment of the present invention.

[0153] Figure 9 This is a schematic diagram of the structure of a color backlight unit provided in an embodiment of the present invention;

[0154] Figure 10 This is a schematic diagram illustrating a complete workflow for temperature compensation of a color backlight unit, provided by an embodiment of the present invention.

[0155] Figure 11 This is a schematic diagram illustrating a complete workflow for aging compensation of a color backlight unit, provided by an embodiment of the present invention.

[0156] Figure 12 This is a schematic diagram of a display chip module structure provided in an embodiment of the present invention. Detailed Implementation

[0157] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0158] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0159] In recent years, with the rapid development of image display technology, display devices have gradually moved towards larger sizes and higher performance to provide users with a better visual experience. Larger display devices feature larger display panels, and to accommodate these larger panels, the backlight panel size also needs to be increased. Therefore, the number of dimming controllers, dimmers, and light-emitting units on the backlight panel increases accordingly. However, due to the large number of dimming controllers, dimmers, and light-emitting units on the backlight panel, the density of hardware components on the backlight panel becomes high, leading to poorer heat dissipation for each component and resulting in a faster and higher temperature rise in the display device.

[0160] Furthermore, high-performance display devices will have higher requirements for high-definition, high-quality, and high-brightness image display. To meet the high-performance requirements of display devices, higher requirements are placed on the control precision of backlight zones when using local dimming technology for backlight control. That is, the number of backlight zones (Local Dimming Zones) on the backlight panel will increase accordingly. This will lead to an increase in the number of local dimming data and control commands that need to be transmitted. In addition, the high brightness requirements will lead to an increase in current, which will also increase the probability of the display device being in a high-temperature state.

[0161] However, in practical applications, this high temperature can damage the light-emitting units in the backlight unit, resulting in lower actual brightness of the light-emitting units and a shorter lifespan, which seriously affects the performance of the display device.

[0162] Figure 1 A schematic diagram illustrating the relationship between temperature and the lifetime of the light-emitting unit, provided by related technologies, is shown. For example... Figure 1 As shown, (a1) is a schematic diagram of the relationship between the ambient temperature, lifespan and brightness output of the light-emitting unit, (b1) is a schematic diagram of the relationship between the interface temperature and lifespan of the light-emitting unit, and (c1) is a schematic diagram of the relationship between the operating current, interface temperature and lifespan of the light-emitting unit.

[0163] See Figure 1 As shown in (a1), when the brightness output of the light-emitting unit reaches 90% of its maximum brightness output, the lifespan of the light-emitting unit is approximately 2100 hours at an ambient temperature of 38℃; while at an ambient temperature of 51℃, the lifespan of the light-emitting unit will be shortened to about 6000 hours. Therefore, in practical applications, the higher the ambient temperature of the light-emitting unit, the shorter its lifespan will be.

[0164] See Figure 1 As can be seen from (b1), as the interface temperature of the light-emitting unit gradually increases, the lifespan of the light-emitting unit gradually decreases. For example, when the interface temperature of the light-emitting unit is 40°C, its lifespan is about 22230 hours, while when the interface temperature rises to 90°C, the lifespan of the light-emitting unit is shortened to about 2230 hours.

[0165] Furthermore, the degree of lifespan reduction varies for different colored light-emitting units. A shorter lifespan indicates more severe device damage and lower actual luminous efficiency; that is, under the same temperature change, the brightness of different colored light-emitting units will change differently. For example, when the interface temperature of the light-emitting unit increases from 60℃ to 80℃, the lifespan of the red light-emitting unit will decrease from approximately 17230 hours to approximately 7230 hours, a reduction of 11100 hours; while the lifespan of the blue light-emitting unit will decrease from approximately 20230 hours to approximately 8723 hours, a reduction of 11723 hours. In other words, the lifespan reduction of the blue light-emitting unit is more severe.

[0166] Therefore, in practical applications, the higher the interface temperature of the light-emitting unit, the shorter its lifespan will be. Furthermore, the different degrees of shortening of the lifespan of light-emitting units of different colors will also lead to different reductions in brightness.

[0167] See Figure 1 As shown in (c1), when the interface temperature of the light-emitting unit is 90℃, its lifespan is approximately 60,000 hours for a light-emitting unit with an operating current of 350mA, and shortened to approximately 35,000 hours for a light-emitting unit with an operating current of 700mA. Therefore, in practical applications, the higher the operating current of the light-emitting unit, the higher its interface temperature and the shorter its lifespan.

[0168] In summary, for light-emitting units, increased temperature will lead to a shortened lifespan.

[0169] Furthermore, with the development of backlight technology, display devices are no longer limited to monochrome backlight units (MonoBLU), and color backlight units (Color BLU) are also widely used in various display devices, as detailed below:

[0170] Figure 2 Schematic diagrams of monochrome backlit display devices and color backlit display devices provided by related technologies are shown. Figure 2 As shown, (a2) is a schematic diagram of a monochrome backlight display device, and (b2) is a schematic diagram of a color backlight display device.

[0171] See Figure 2 In (a2), in a monochrome backlit display device, the light-emitting unit provided on the backlight panel 21-A is a monochrome light-emitting unit, for example, any one of a white light-emitting unit, a yellow light-emitting unit, etc. By controlling the different light emission brightness of the monochrome light-emitting units on the backlight panel 21-A, corresponding backlight is provided to the display panel 23.

[0172] See Figure 2In (b2), in a color-backlit display device, the light-emitting units provided on the backlight panel 21-B are color-emitting units. For example, red, green, and blue light-emitting units can be used, or red, green, blue, and white light-emitting units can be used. By controlling the different brightness levels of the color-emitting units on the backlight panel 21-A, corresponding backlight is provided to the display panel 23.

[0173] As discussed above, higher temperatures result in shorter lifespans, lower luminous efficiency, and lower actual brightness of the light-emitting units. However, in color-backlit display architectures, not only does high temperature damage the lifespan of light-emitting units, but the brightness reduction of different colors of light-emitting units also varies with increasing temperature. When the actual brightness of each light-emitting unit deviates from its theoretical brightness to varying degrees, color cast issues occur, leading to white balance problems and severely impacting display performance.

[0174] To mitigate the impact of high temperatures on display devices, existing technologies typically incorporate temperature sensors within the display device to monitor the temperature of the light-emitting units, and control the units to stop emitting light at a specific temperature. The following is a brief explanation using a monochrome backlit display device as an example:

[0175] Figure 3 A schematic diagram of a display device equipped with a temperature sensor, provided by related technologies, is shown. For example... Figure 3 As shown, (a3) ​​is a schematic diagram of a display device with the temperature sensor inside the dimmer, and (b3) is a schematic diagram of a display device with the temperature sensor outside the dimmer.

[0176] See Figure 3 In (a3), a plurality of dimmers 212 are provided on the backlight panel 21-A. Each dimmer 212 has multiple output channels. Each output channel is connected to at least one light-emitting unit 213. A temperature sensor 215 is provided inside the dimmer 212. The temperature sensor 215 can monitor the temperature of the light-emitting unit 213 connected to each output channel of the dimmer 212 in real time.

[0177] See Figure 3 In (b3), a plurality of dimmers 212 are provided on the backlight panel 21-A. Each dimmer 212 has a plurality of output channels. Each output channel is connected to at least one light-emitting unit 213. A temperature sensor 215 is provided at a fixed position on the backlight panel 21-A. The temperature sensor 215 can monitor the temperature of the light-emitting unit 213 within its own temperature sensing range in real time.

[0178] also, Figure 3 In the examples (a3) ​​and (b3), one output channel corresponds to multiple light-emitting units 213. The multiple light-emitting units 213 corresponding to one output channel are cascaded. Among the multiple light-emitting units 213, the cathode of the light-emitting unit 213 closest to the dimmer 212 is electrically connected to the output channel of the dimmer 212, and the anode of the light-emitting unit 213 furthest from the dimmer 212 is electrically connected to the power converter 216. The power converter 216 is also electrically connected to the dimming controller 22 and is used to convert the initial voltage it receives to generate a power supply voltage suitable for the light-emitting unit 213.

[0179] However, regardless of the temperature sensor setting method used, although existing technologies may take remedial measures to control the light-emitting unit to stop emitting light, high-temperature damage to the light-emitting unit has already been caused. Therefore, this method in existing technologies cannot actually extend the service life of the light-emitting unit.

[0180] Furthermore, the need to add multiple temperature sensors complicates the structure of the backlight unit, which in turn complicates the manufacturing process of the backlight panel, thereby increasing the manufacturing cost of the display device.

[0181] Furthermore, Figure 3 The design architecture provided is not suitable for color-backlit display devices, as it cannot solve the problem of white balance collapse in color backlight units under high-temperature conditions.

[0182] Based on this, embodiments of the present invention provide a backlight control method, a display chip, and a backlight module to reduce damage to the light-emitting unit caused by high temperatures without additional temperature sensors, extend the lifespan of the light-emitting unit, compensate for the reduced luminous efficiency of the light-emitting unit, ensure the HDR requirements of the display device, and also avoid white balance collapse in color backlit display devices, thereby improving the performance of the display device.

[0183] The objectives, functional features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the invention. Furthermore, the embodiments and features described herein can be combined with each other without conflict.

[0184] The application scenarios of the backlight control method provided by the embodiments of the present invention will be described below with reference to the accompanying drawings:

[0185] The backlight control method provided in this embodiment of the invention can be applied to display devices, such as... Figure 4As shown, the display device 300 typically includes a timing controller 310, a dimming controller 320, a display panel 330, and a backlight panel 340. The timing controller 310 is connected to both the dimming controller 320 and the display panel 330, and the dimming controller 320 is also connected to the backlight panel 340. The display panel 330 is positioned opposite to the backlight panel 340, and is located on the light-emitting side of the backlight panel 340. The backlight panel 340 is equipped with a dimmer 341 and a light-emitting unit 342. The dimmer 341 is electrically connected to the cathode of the light-emitting unit 342, and the anode of the light-emitting unit 342 is electrically connected to the power supply terminal VDD. For example, the light-emitting unit 342 can be a direct-lit AM mini-LED (Active Matrix Mini Light Emitting Diode).

[0186] In practical applications, the timing controller 310 in this embodiment of the invention can be a TCON (Timing Controller) chip, a SoC (System on Chip), or other chips or circuits with timing control functions, such as screen driver circuits. This embodiment of the invention does not impose any restrictions on this.

[0187] Furthermore, the dimming controller 320 in this embodiment of the invention can be a dimming control chip, an MCU (Microcontroller Unit), or other chips or circuits with backlight control functions. This embodiment of the invention does not impose any restrictions on these.

[0188] It should be noted that the architecture of the backlight panel 340 in the display device 300 provided in this embodiment of the invention can adopt the existing backlight panel architecture, and this embodiment of the invention does not impose any restrictions on it.

[0189] In a specific implementation, the timing controller 310 generates local dimming data based on the display data corresponding to an image frame, and sends the local dimming data to the dimming controller 320, as well as the display data to the display panel 330. The dimming controller 320 processes the received local dimming data and sends the processed local dimming data to the backlight panel 340. The dimmer 341 in the backlight panel 340 generates PWM local dimming data based on the received local dimming data, and sends the PWM local dimming data to the light-emitting unit 342 connected to it to control the lighting of the light-emitting unit 342, thereby providing corresponding backlight for the display panel 330. The display panel 330 can display the image frame based on the received display data and the backlight provided by the backlight panel 340.

[0190] Of course, the methods provided in the embodiments of the present invention are not limited to those described above. Figure 4 The application scenarios shown can also be used in other possible application scenarios, and the embodiments of the present invention do not impose any limitations.

[0191] The method for transmitting dimming data provided in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings:

[0192] The backlight control method provided in this embodiment of the invention can be applied to various display chips, such as dimmers, dimming controllers, MCUs, SoCs, TCONs, etc. This embodiment of the invention does not impose any limitations on this.

[0193] Figure 5 A schematic diagram illustrating the workflow of a backlight control method provided in an embodiment of the present invention is shown. Figure 5 As shown, the backlight control method of this embodiment of the invention may specifically include the following steps:

[0194] Step S501: Determine the current temperature state of the target light-emitting unit based on the dimming data corresponding to the target output channel in multiple first image frames.

[0195] Among them, the multiple first image frames are multiple image frames that have been displayed within the first time period, the target output channel is any one of the multiple output channels of the dimmer, and the target light-emitting unit is the light-emitting unit connected to the target output channel.

[0196] In some embodiments, the start time of the first time period is no earlier than the power-on time of the display device, and the end time of the first time period is no later than the power-off time of the display device. In specific implementations, the first time period can be set to any integer multiple of the display period corresponding to one image frame, or it can be set to a fixed duration, such as 10 minutes, 20 minutes, etc., or it can be set to the entire duration of one power-on operation and corresponding power-off operation of the display device. It can be flexibly set according to actual application needs, and the embodiments of the present invention do not impose any limitations on this.

[0197] Furthermore, in this embodiment of the invention, one image frame corresponds to multiple dimming data, and one dimming data is used to control the light-emitting unit connected to one output channel of the dimmer. That is, taking a dimmer with four output channels as an example, the dimmer will receive four dimming data, and one dimming data is transmitted to the subsequent light-emitting unit through one output channel of the dimmer to control the lighting of one or more light-emitting units connected to the corresponding output channel.

[0198] In some embodiments, the following implementation method can be adopted during the execution of step S501:

[0199] Step S501-1: Determine the first dimming cumulative data based on the dimming data corresponding to the target output channel in multiple first image frames.

[0200] In one implementation, if the display chip uses a dimmer, the display chip can determine the first dimming cumulative data in the following way:

[0201] For any first image frame, the display chip will determine the dimming data corresponding to the target output channel from the corresponding N dimming data it receives; the display chip will accumulate all the determined dimming data corresponding to the target output channel to obtain the first dimming cumulative data; where N = the number of output channels of a dimmer.

[0202] In another implementation, if the display chip uses any one of a dimming controller, MCU, SoC, or TCON, the display chip can determine the first dimming cumulative data in the following way:

[0203] For any first image frame, the display chip will determine the dimming data corresponding to the target output channel from the M dimming data it receives; the display chip will accumulate all the dimming data corresponding to the target output channel to obtain the first dimming cumulative data; where M = the number of output channels of a dimmer × the number of dimmers on the backlight panel, and the target output channel is any output channel of any dimmer.

[0204] Furthermore, in this embodiment of the invention, the dimming data includes current data and PWM data. Therefore, the display chip can specifically determine the first cumulative dimming data in the following way:

[0205] The display chip can accumulate the current data in the dimming data corresponding to the target output channel to obtain first accumulated current data, and / or accumulate the PWM data in the dimming data corresponding to the target output channel to obtain first accumulated PWM data; wherein, the first accumulated dimming data includes first accumulated current data and / or first accumulated PWM data.

[0206] Specifically, in this embodiment of the invention, during the accumulation of dimming data to generate first dimming cumulative data, only the current data in the dimming data can be accumulated, thus the generated first dimming cumulative data includes first current cumulative data; alternatively, only the PWM data in the dimming data can be accumulated, thus the generated first dimming cumulative data includes first PWM cumulative data; or both the current data and PWM data can be accumulated simultaneously, thus the generated first dimming cumulative data includes both first current cumulative data and first PWM cumulative data. This embodiment of the invention does not impose any limitations on these methods.

[0207] Furthermore, in this embodiment of the invention, in order to perform cumulative calculations, a non-volatile memory can be used as a storage module to cache the dimming data. For example, flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), etc., can be used. In practical applications, depending on the design architecture of the display device, the storage module can be presented as the built-in memory of the display chip or as the external memory of the display chip. This embodiment of the invention does not impose any restrictions on this.

[0208] In the above embodiments, since the dimming data includes current data and PWM data, when accumulating the dimming data corresponding to the target output channel, the current data can be accumulated, the PWM data can be accumulated, or both the current data and the PWM data can be accumulated simultaneously to generate the first dimming cumulative data for temperature state prediction. The calculation method is flexible.

[0209] Step S501-2: Based on the first dimming cumulative data, determine the current temperature state of the target light-emitting unit.

[0210] In this embodiment of the invention, in the process of the display chip predicting the current temperature state of the target light-emitting unit using the first dimming cumulative data, there are at least two feasible implementation methods:

[0211] Method 1:

[0212] In some embodiments, the display chip can directly determine the current temperature state of the target light-emitting unit based on a first correspondence and first dimming cumulative data; wherein, the first correspondence is used to characterize the correspondence between the dimming cumulative data and the temperature state, and the temperature state includes at least a normal temperature state and a high temperature state.

[0213] As shown in Table 1, this is an example of the first correspondence provided in an embodiment of the present invention:

[0214] Dimming cumulative data Data1 Temperature status 0≤Data1<A Normal temperature state Data1≥A High temperature state

[0215] Table 1

[0216] In Table 1, A is a preset dimming data threshold. When the cumulative dimming data Data1 < A, the light-emitting unit is considered to be in a normal temperature state; when the cumulative dimming data Data1 ≥ A, the light-emitting unit is considered to be in a high temperature state.

[0217] Specifically, the display chip can determine the temperature state corresponding to the first dimming cumulative data in the first correspondence relationship based on the first dimming cumulative data, and use the determined temperature state as the current temperature state of the target light-emitting unit. For example, when the first dimming cumulative data is determined to be any value ≥ A, it can be determined that the target light-emitting unit is in a high-temperature state.

[0218] It should be noted that the first correspondence in this invention, as well as the various correspondences in subsequent embodiments, can all exist in the form of a look-up table (LUT), which will not be elaborated upon in subsequent embodiments. Furthermore, the various correspondences provided in the embodiments of this invention can be constructed based on the experimental structure of mini-LED characteristics or the specification data of mini-LEDs. When conducting mini-LED characteristic experiments, fixed current data and PWM data can be input to an independent mini-LED, and various characteristic parameters of the mini-LED under different inputs can be measured. The various correspondences provided in the embodiments of this invention can then be constructed based on the obtained characteristic parameters.

[0219] Method 2:

[0220] In some embodiments, the display chip can determine the current temperature value of the target light-emitting unit based on a first correspondence and first dimming cumulative data, wherein the first correspondence is used to characterize the correspondence between the dimming cumulative data and the temperature value; compare a preset temperature threshold with the current temperature value, and if the current temperature value is greater than or equal to the preset temperature threshold, determine that the current temperature state is a high temperature state; if the current temperature value is less than the preset temperature threshold, determine that the current temperature state is a normal temperature state.

[0221] Table 2 shows another example of the first correspondence provided in the embodiments of the present invention:

[0222] Dimming cumulative data Data1 Temperature value 0≤Data1<B1 10℃ B1≤Data1<B2 15℃ … … Bi≤Data1<Bi+1 75℃ … …

[0223] Table 2

[0224] In Table 2, B1, B2, B3, ..., Bi, Bi+1, ... are pre-set multi-level dimming data thresholds, and B1, B2, B3, ..., Bi, Bi+1, ... gradually increase. In practical applications, the temperature value of the light-emitting unit can be determined based on the dimming data threshold range to which the calculated cumulative dimming data Data1 belongs.

[0225] Specifically, the display chip can determine the temperature value corresponding to the first dimming cumulative data in the first correspondence relationship based on the first dimming cumulative data, and use the determined temperature value as the current temperature value of the target light-emitting unit. For example, when it is determined that B1 ≤ first dimming cumulative data < B2, the current temperature value of the target light-emitting unit = 15℃.

[0226] It is understandable that the value of the first dimming cumulative data is directly proportional to the temperature value of the light-emitting unit. That is, the larger the value of the first dimming cumulative data, the higher the brightness of the light-emitting unit, the higher the temperature value of the light-emitting unit, and the shorter the lifespan of the light-emitting unit. Therefore, it can be considered that the value of the first dimming cumulative data is inversely proportional to the lifespan of the light-emitting unit.

[0227] Then, the current temperature value is compared with the preset temperature threshold. If the current temperature value is greater than or equal to the preset temperature threshold, it can be determined that the target light-emitting unit is in a high-temperature state; otherwise, it is determined that the target light-emitting unit is in a normal temperature state.

[0228] In the above embodiments, the current temperature state of the target light-emitting unit is predicted by using the first correspondence and the first dimming cumulative data. The current temperature state of the target light-emitting unit can be determined without adding an additional temperature sensor, and temperature compensation operation based on the current temperature state can be performed to reduce the impact of high temperature on the light-emitting unit and extend the life of the light-emitting unit. Moreover, since no additional temperature sensor is required, compared with the existing technology of setting a temperature sensor for high temperature compensation, it is possible to simplify the production process without changing the backlight panel structure and reduce the cost of the display device.

[0229] Step S502: Based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame, determine the target dimming data, and control the backlight brightness of the target light-emitting unit according to the target dimming data.

[0230] In some embodiments, the display chip can determine the first dimming compensation data corresponding to the target light-emitting unit based on the current temperature state, and adjust the dimming data corresponding to the target output channel in the current image frame according to the first dimming compensation data to obtain the target dimming data, as follows:

[0231] Step S502-1: When the current temperature is determined to be a normal temperature, the display chip will use the dimming data corresponding to the target output channel in the current image frame as the target dimming data.

[0232] In practical implementation, if the light-emitting unit is at normal temperature, there is no need to adjust the dimming data corresponding to the target output channel in the current image frame. This data can be directly used as the target dimming data for backlight control of the target light-emitting unit. In other words, the dimming data corresponding to the target output channel in the current image frame remains unchanged to ensure a relatively ideal backlight brightness for image display.

[0233] Step S502-2: When the current temperature state is determined to be a high temperature state, the display chip will determine the first dimming compensation data corresponding to the target unit based on the high temperature state, and adjust the dimming data corresponding to the target output channel in the current image frame according to the first dimming compensation data to obtain the target dimming data.

[0234] In some embodiments, when the current temperature state of the target light-emitting unit is determined to be a high-temperature state, the display chip can compare a preset duration threshold with the duration of the high-temperature state; if the duration of the high-temperature state is greater than the preset duration threshold, then the first dimming compensation data is determined according to the second correspondence and the current temperature value of the target light-emitting unit; wherein, the second correspondence is used to characterize the correspondence between the temperature value and the dimming compensation data.

[0235] Specifically, the display chip can determine the dimming compensation data corresponding to the current temperature value in the second correspondence based on the current temperature value, and use the determined dimming compensation data as the first dimming compensation data corresponding to the target light-emitting unit.

[0236] Furthermore, if the duration of the high-temperature state is less than or equal to a preset duration threshold, the display chip will directly use the dimming data corresponding to the target output channel in the current image frame as the target dimming data. That is, the dimming data will remain unchanged.

[0237] In the above embodiments, when the duration of the current temperature state is determined to be greater than a preset duration threshold, the first dimming compensation data corresponding to the target light-emitting unit is extracted using the second correspondence relationship. This facilitates high-temperature compensation processing of the target light-emitting unit, reduces the damage of high temperature to the light-emitting unit, and extends the lifespan of the light-emitting unit. Furthermore, when the duration of the high-temperature state is determined to be less than or equal to the preset duration threshold, it indicates that the temperature at this time causes relatively little damage to the light-emitting unit. In this case, the dimming data corresponding to the target output channel in the current image frame can be directly used as the target dimming data, i.e., the dimming data corresponding to the target output channel in the current image frame remains unchanged, ensuring a relatively ideal backlight brightness for image display.

[0238] Specifically, in the process of performing temperature compensation on the dimming data and determining the target dimming data in step S502-2, the following methods can be used:

[0239] In some embodiments, when the display chip determines that the duration of the high-temperature state exceeds a preset duration threshold, it can use the first dimming compensation data to reduce the dimming data corresponding to the target output channel in the current image frame to obtain the target dimming data.

[0240] Specifically, the dimming data includes current data and PWM data. In the process of reducing the dimming data corresponding to the target output channel in the current image frame using the first dimming compensation data, only the current data can be reduced to decrease the operating current of the target light-emitting unit during the display of the current image frame; or only the PWM data can be reduced to decrease the duty cycle or amplitude of the PWM signal used to control the light emission of the target light-emitting unit during the display of the current image frame; or both the current data and the PWM data can be reduced simultaneously. These can be flexibly set according to actual needs, and the embodiments of the present invention do not impose any restrictions on this.

[0241] In specific implementation, the first dimming compensation data can be a negative value. The display chip can use the sum of the first dimming compensation data and the dimming data corresponding to the target output channel in the current image frame as the target dimming data. Of course, it should be understood that this embodiment is only an exemplary illustration. In practical applications, any other feasible method can be used to reduce the dimming data corresponding to the target output channel in the current image frame based on the first dimming compensation data. This embodiment of the invention does not impose any limitations on this.

[0242] In the above embodiments, reducing the dimming data will lead to a decrease in the operating current or lighting frequency of the target light-emitting unit, thereby reducing the heat generated by the target light-emitting unit and correspondingly reducing the temperature of the target light-emitting unit. This achieves the purpose of reducing the temperature of the light-emitting unit, avoiding damage to the light-emitting unit caused by continuous high temperature, and extending the service life of the light-emitting unit.

[0243] In some embodiments, after obtaining the target dimming data, the display chip will also perform accumulation processing on the target dimming data and the first dimming cumulative data, and update the first dimming cumulative data according to the accumulation result.

[0244] Figure 6 A schematic diagram illustrating the overall workflow of temperature compensation using a backlight control method according to an embodiment of the present invention is shown. Figure 6 As shown, it may include the following steps:

[0245] Step S601: For any one of the multiple output channels of the dimmer, determine the first dimming cumulative data based on the dimming data corresponding to that output channel in the multiple first image frames;

[0246] Step S602: Based on the first correspondence and the determined cumulative data of multiple first dimming, determine the current temperature state of the light-emitting unit connected to each output channel of each dimmer.

[0247] Step S603: If the current temperature state is a high temperature state, determine whether the duration of the high temperature state is greater than the preset duration threshold. If yes, proceed to step S604; otherwise, proceed to step S606.

[0248] Step S604: Based on the first correspondence and the current temperature values ​​of each of the multiple light-emitting units, determine the first dimming compensation data corresponding to each light-emitting unit;

[0249] Step S605: Using the first dimming compensation data corresponding to each light-emitting unit, the dimming data corresponding to each output channel in the current image frame is reduced respectively to obtain the target dimming data, and the corresponding first dimming cumulative data is updated using the target dimming data.

[0250] Step S606: The dimming data corresponding to each output channel in the current image frame is directly used as the target dimming data, and the corresponding first dimming cumulative data is updated using the target dimming data.

[0251] In this embodiment of the invention, the current temperature state of the target light-emitting unit is predicted by using multiple dimming data corresponding to the target output channel over a period of time, and the predicted current temperature state is used to perform temperature compensation on the dimming data transmitted to the target light-emitting unit. Since no additional temperature sensor is required, the development cost of the device can be effectively reduced.

[0252] Furthermore, since the determination of the current temperature state depends on the cumulative data of multiple dimming data of the target output channel over a period of time, the impact of continuous temperature rise on the target light-emitting unit can be taken into account. Therefore, temperature compensation based on the current temperature state and backlight control using the supplemented dimming data can reduce the damage caused by high temperature to the light-emitting unit and effectively extend the service life of the light-emitting unit.

[0253] Furthermore, by using the accumulated dimming data from each output channel to specifically compensate the light-emitting units connected to each output channel, this targeted temperature compensation method has a superior compensation effect and can effectively improve the performance of the display device.

[0254] To make it easier to understand, here's a simple example:

[0255] Taking a user browsing a document on a personal computer as an example, since the document contains white background areas and black text areas, when the user browses the document for a long time, the brightness of the light-emitting units on the backlight panel corresponding to the white background area remains high, and the temperature of these light-emitting units rises rapidly. Conversely, the brightness of the light-emitting units on the backlight panel corresponding to the black text area is relatively low, and the temperature of these light-emitting units rises more slowly. The backlight control method provided in this embodiment of the invention can specifically compensate for the brightness of the light-emitting units on the backlight panel corresponding to the white background area, adaptively reducing the brightness of these light-emitting units. This avoids damage to these light-emitting units caused by high temperatures and extends their lifespan without affecting the user's visual experience.

[0256] Furthermore, the backlight control method provided in this embodiment of the invention not only achieves temperature compensation for the light-emitting unit, but also takes into account the impact of the aging state of the light-emitting unit on its actual luminous brightness, and compensates accordingly to further optimize the performance of the display device, as detailed below:

[0257] Figure 7 A schematic diagram illustrating the workflow of aging compensation using a backlight control method according to an embodiment of the present invention is shown. Figure 7 As shown, it may include the following steps:

[0258] Step S701: Determine the current aging state of the target light-emitting unit based on the dimming data corresponding to the target output channel in the multiple second image frames, wherein the multiple second image frames are multiple image frames that have been displayed within the second time period.

[0259] In some embodiments, the start time of the second time period is the first power-on time of the display device.

[0260] In practice, the second time period can be the entire lifecycle of the display device, from its first power-on to its last power-off. Simply put, the first dimming accumulated data is reset to zero at the end of the first time period, while the second dimming accumulated data is accumulated from the first image display and is not reset in between.

[0261] In some embodiments, the following implementation method can be adopted during the execution of step S701:

[0262] Step S701-1: Determine the second dimming cumulative data based on the dimming data corresponding to the target output channel in multiple second image frames.

[0263] It should be understood that the method for generating the second dimming cumulative data in step S701 can refer to the method for generating the first dimming cumulative data in step S501-1, so it will not be described again.

[0264] Step S701-2: Based on the second dimming cumulative data, determine the current aging state of the target light-emitting unit.

[0265] In some embodiments, during the execution of step S701-2, the display chip may specifically adopt the following method: the display chip may determine the current aging state based on the third correspondence and the second dimming cumulative data, wherein the third correspondence is used to characterize the correspondence between the dimming cumulative data and the aging state of the light-emitting unit.

[0266] As shown in Table 3, this is an example of a third correspondence provided in an embodiment of the present invention:

[0267] Dimming cumulative data Data2 Aging state 0≤Data2<C1 Level 1 Aging State C1≤Data2<C2 Second stage of aging C2≤Data2<C3 Level 3 Aging State … …

[0268] Table 3

[0269] In Table 3, C1, C2, C3, ... represent pre-set multi-level dimming data thresholds, with C1, C2, C3, ... gradually increasing. In practical applications, the aging state of the light-emitting unit can be determined based on the dimming data threshold range to which the calculated cumulative dimming data Data2 belongs. Furthermore, the aging states in Table 3 increase progressively, meaning that the aging degree of the light-emitting unit corresponding to the first-level aging state is lower than that corresponding to the second-level aging state.

[0270] Specifically, the display chip can determine the aging state corresponding to the second dimming cumulative data in the third correspondence based on the second dimming cumulative data, and use the determined aging state as the current aging state of the target light-emitting unit. For example, when it is determined that C1 ≤ second dimming cumulative data < C2, the current aging state of the target light-emitting unit is the second-level aging state.

[0271] It is understandable that the value of the second dimming cumulative data is directly proportional to the aging state of the light-emitting unit. That is, the larger the value of the second dimming cumulative data, the higher the frequency of use of the light-emitting unit, and the more serious the aging of the light-emitting unit.

[0272] Step S702: Determine target dimming data based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame.

[0273] In some embodiments, the following implementation method can be adopted during the execution of step S702:

[0274] Step S720-1: Based on the current temperature state, determine the first dimming compensation data corresponding to the target light-emitting unit, and based on the current aging state, determine the second dimming compensation data corresponding to the target light-emitting unit.

[0275] In some embodiments, the display chip may perform step S720-1 in the following manner: when the display chip determines that the current temperature state is a high temperature state, the display chip will determine the first dimming compensation data corresponding to the target unit based on the high temperature state and the second correspondence; in addition, the display chip will also determine the second dimming compensation data according to the fourth correspondence and the current aging state, wherein the fourth correspondence is used to characterize the correspondence between the aging state of the light-emitting unit and the dimming compensation data.

[0276] Specifically, the display chip can determine the dimming compensation data corresponding to the current aging state in the fourth correspondence based on the current aging state, and use the determined dimming compensation data as the second dimming compensation data corresponding to the target light-emitting unit.

[0277] In the above embodiments, the current aging state of the target light-emitting unit is predicted by using the third correspondence relationship, and the second dimming compensation data corresponding to the current aging state is determined based on the predicted current aging state and the fourth correspondence relationship. The dimming data is then compensated using the second dimming compensation data, so that the light-emitting unit's reduced brightness due to its own aging is restored to normal, ensuring the HDR requirements of the display device and improving the display effect of the display device.

[0278] Step S702-2: Adjust the dimming data corresponding to the target output channel in the current image frame according to the first dimming compensation data and the second dimming compensation data to obtain the target dimming data.

[0279] In some embodiments, after obtaining the target dimming data, the display chip will also perform accumulation processing on the target dimming data and the second dimming cumulative data, and update the second dimming cumulative data according to the accumulation result.

[0280] In the above embodiments, the second dimming cumulative data, determined by dimming data corresponding to the target output channel in multiple second image frames, is also used to predict the current aging state of the target light-emitting unit, and the second dimming compensation data is determined based on the current aging state. Then, the first dimming compensation data and the second dimming compensation data are used to perform temperature compensation on the dimming data corresponding to the target output channel in the current image frame, so that when the target light-emitting unit controls its own brightness according to the compensated target dimming data, the phenomenon of reduced actual light emission brightness caused by the aging of the light-emitting unit can be mitigated. While ensuring that the light-emitting unit itself is not damaged, the actual light emission brightness of the light-emitting unit is controlled to be close to the theoretical light emission brightness, ensuring the display effect of the image and improving the performance of the display device.

[0281] In this embodiment of the invention, there are multiple feasible implementation methods for the display chip to perform dimming compensation based on the first dimming compensation data and the second dimming compensation data. Two of them will be described in detail below:

[0282] In one implementation, the display chip can use first dimming compensation data to decrease the dimming data corresponding to the target output channel in the current image frame to obtain intermediate dimming data; then, it can use second dimming compensation data to increase the intermediate dimming data to obtain the target dimming data.

[0283] Specifically, the first dimming compensation data can be used to reduce the dimming data sent to the light-emitting unit, thereby lowering the brightness of the light-emitting unit and its temperature. This prevents damage from sustained high temperatures and extends the lifespan of the light-emitting unit. However, as the display device is used, the light-emitting unit will inevitably age, its luminous efficiency will decrease, and the actual luminous brightness will be lower than the theoretical luminous brightness. Therefore, when the display brightness is too low after high-temperature compensation, the second dimming compensation data can be used to adaptively increase the dimming data after high-temperature compensation to improve the brightness of the light-emitting unit and ensure the display performance of the display device.

[0284] In another implementation, the display chip can determine a target dimming compensation data based on the first dimming compensation data and the second dimming compensation data, and use the target dimming compensation data to adjust the dimming data corresponding to the target output channel in the current image frame to obtain the target dimming data.

[0285] Specifically, the first dimming compensation data and the second dimming compensation data can be weighted and calculated to obtain the target dimming compensation data, so as to balance the display performance of the display device.

[0286] In the above embodiments, the first dimming data and the second dimming data can be used to compensate the dimming data corresponding to the target output channel in the current image frame. This ensures that the light-emitting unit itself is not affected by the high temperature, while controlling the light-emitting unit to restore the reduced light brightness due to its own aging to normal, so that the actual light brightness of the light-emitting unit is close to the theoretical light brightness, thereby improving the performance of the display device.

[0287] Figure 8 A schematic diagram illustrating the overall workflow of aging compensation using a backlight control method according to an embodiment of the present invention is shown. Figure 8 As shown, it may include the following steps:

[0288] Step S801: Accumulate the dimming data corresponding to the target output channel in multiple second image frames to determine the second dimming cumulative data;

[0289] Step S802: Based on the second dimming cumulative data and the third correspondence, determine the current aging state of the target light-emitting unit;

[0290] Step S803: Based on the current aging state and the fourth correspondence, determine the second dimming compensation data corresponding to the target light-emitting unit;

[0291] Step S804: Adjust the dimming data corresponding to the target output channel in the current image frame according to the first dimming compensation data and the second dimming compensation data to obtain target dimming data, and control the backlight brightness of the target light-emitting unit according to the target dimming data.

[0292] Furthermore, the backlight control method provided in this embodiment of the invention can be applied not only to display devices with monochrome backlight units but also to display devices with color backlight units. When applied to display devices with color backlight units, it can effectively maintain white balance and ensure the display performance of the device, as detailed below:

[0293] Figure 9 A schematic diagram of the structure of a color backlight unit provided in an embodiment of the present invention is shown.

[0294] like Figure 9As shown, in the color backlight unit, the different output channels of the dimmer 341 are connected to different colored light-emitting units. Specifically, the R output channel of the dimmer 341 connects to the R-color light-emitting unit, the G output channel connects to the G-color light-emitting unit, and the B output channel connects to the B-color light-emitting unit. Therefore, the multiple output channels of the dimmer 341 are also color output channels. The dimmer 341 sends dimming data corresponding to the color to the corresponding output channel; that is, it sends the dimming data corresponding to the R color to the R output channel, the dimming data corresponding to the G color to the G output channel, and the dimming data corresponding to the B color to the B output channel.

[0295] In specific implementation, within the color backlight unit architecture, during the process of accumulating the dimming data to obtain the first cumulative dimming data, the dimming data for each color is accumulated separately. Specifically, the dimming data corresponding to each output channel within the first time period is accumulated. Since the output channel is a color output channel, each output channel connects to a light-emitting unit of one color and receives dimming data for one color. Therefore, by accumulating the dimming data corresponding to each output channel, the accumulation calculation of dimming data for each color can be achieved. At this time, the generated first cumulative dimming data is the dimming data for the corresponding color. Furthermore, its specific implementation method is similar to the implementation method of accumulating the first dimming data corresponding to step S501-1, and can be referred to the implementation method of the embodiment corresponding to step S501-1, so it will not be described again.

[0296] It should be understood that this example is provided for illustrative purposes. Figure 9 Taking a three-color (R, G, B) backlight unit as an example. In practical applications, the colors of the light-emitting units in a color backlight unit can also be other color combinations, such as a two-color (RG and B, or RB and G, or BG and R) backlight unit, a four-color (R, G, B, and W) backlight unit, etc. This embodiment of the invention does not impose any restrictions on this.

[0297] In some embodiments, the first dimming cumulative data obtained in the color backlight unit architecture is the first dimming cumulative data of the target color, where the target color is the emission color of the target light-emitting unit connected to the target output channel. Therefore, the current temperature state of the target light-emitting unit can be determined in the following way:

[0298] The display chip can determine the first target correspondence among multiple fifth correspondences based on the target color; and determine the current temperature state of the target light-emitting unit based on the first target correspondence and the first dimming cumulative data of the target color.

[0299] In this embodiment of the invention, in the color backlight unit architecture, multiple fifth correspondences are set according to the color type and number of the light-emitting units. These multiple fifth correspondences are used to characterize the correspondence between the cumulative dimming data of different colors and the temperature state, where the temperature state includes at least a high-temperature state and a normal-temperature state. For example, assuming the color backlight unit is an R, G, and B three-color backlight unit, then three fifth correspondences are set, namely the fifth correspondence for R color, the fifth correspondence for G color, and the fifth correspondence for B color.

[0300] In practical implementation, if the first dimming cumulative data is the dimming cumulative data of color R, the display chip will use the fifth correspondence of color R as the first target correspondence, and determine the temperature state corresponding to the first dimming cumulative data in the first target correspondence based on the first dimming cumulative data, and use the determined temperature state as the current temperature state of the target light-emitting unit. The same process is performed on each color separately to obtain the current temperature state corresponding to the light-emitting unit of each color.

[0301] In the above embodiments, in the color backlight unit architecture, the colors of the light-emitting units connected to different output channels of the dimmer are also different. That is, the output channels of the dimmer are color output channels. At this time, for a light-emitting unit of a certain color (i.e., the target color), the current temperature state of the target light-emitting unit is predicted by using the first target correspondence relationship corresponding to that color and the first cumulative data of that color, and high-temperature compensation is performed on the target light-emitting unit using the current temperature state. Since there are different fifth correspondence relationships for different colors of light-emitting units, and the current temperature state of the corresponding color light-emitting unit is predicted accordingly, targeted compensation can be performed for light-emitting units of different colors. This avoids the white balance collapse problem caused by the different reduction in brightness of light-emitting units of different colors as the temperature rises, ensuring the image display effect of the display device and improving the performance of the display device.

[0302] In some embodiments, after obtaining the current temperature state corresponding to each color light-emitting unit, the display chip can determine the first dimming compensation data in the following manner:

[0303] When the current temperature is high, the duration of the high temperature state is compared with the preset duration threshold. If the duration of the high temperature state is greater than the preset duration threshold, the second target correspondence is determined from multiple sixth correspondences based on the target color. The first dimming compensation data is determined based on the second target correspondence and the current temperature value of the target light-emitting unit. The current temperature value is determined based on the first dimming cumulative data of the target color.

[0304] In this embodiment of the invention, multiple sixth correspondences are set according to the color type and quantity of the light-emitting units. These multiple sixth correspondences are used to characterize the correspondence between the temperature values ​​and dimming compensation data of different color light-emitting units. For example, assuming that the color backlight unit is an R, G, and B three-color backlight unit, then three sixth correspondences are set, namely the sixth correspondence for R color, the sixth correspondence for G color, and the sixth correspondence for B color.

[0305] In practical implementation, if the current temperature state is predicted based on the first dimming cumulative data of color R, the display chip will use the sixth correspondence of color R as the second target correspondence, and determine the dimming compensation data corresponding to the current temperature value in the second target correspondence based on the current temperature value of the target light-emitting unit. This determined dimming compensation data will then be used as the first dimming compensation data. The same process is performed on each color separately to obtain the first dimming compensation data corresponding to the light-emitting unit of each color.

[0306] Furthermore, if the duration of the high-temperature state is less than or equal to a preset duration threshold, the display chip will directly use the dimming data corresponding to the target output channel in the current image frame as the target dimming data. That is, the dimming data will remain unchanged.

[0307] In the above embodiments, in the color backlight unit architecture, for a light-emitting unit of a certain color (i.e., the target color), the first dimming compensation data of the target light-emitting unit is determined using the second target correspondence relationship corresponding to that color, and the dimming data corresponding to the target light-emitting unit is compensated using the first dimming compensation data. Since there are different sixth correspondence relationships for different colors of light-emitting units, the first dimming compensation data used by the corresponding color light-emitting unit during the high-temperature compensation process is extracted accordingly. Targeted compensation is then performed using this first dimming compensation data, avoiding white balance collapse caused by the different brightness reduction amounts of light-emitting units of different colors as temperature increases. This ensures the image display effect of the display device and improves the performance of the display device.

[0308] In some embodiments, after the display chip obtains the first dimming compensation data corresponding to each output channel, it uses the first dimming compensation data to reduce the dimming data corresponding to the corresponding output channel in the current image frame to obtain target dimming data, and uses the target dimming data to control the brightness of the corresponding light-emitting unit.

[0309] It should be noted that when performing temperature compensation on the dimming data corresponding to the corresponding output channel in the current image frame, the specific compensation method can be referred to the implementation method of the corresponding embodiment in step S502-2, and will not be repeated here.

[0310] In some embodiments, after obtaining the target dimming data, the display chip will also perform accumulation processing on the target dimming data and the first dimming cumulative data, and update the first dimming cumulative data according to the accumulation result.

[0311] Figure 10 A schematic diagram illustrating a complete workflow for temperature compensation of a color backlight unit according to an embodiment of the present invention is shown. Figure 10 As shown, it may include the following steps:

[0312] Step S1001: For each color, the dimming data corresponding to each color output channel is accumulated to obtain the first dimming accumulated data for each color.

[0313] Step S1002: For any color corresponding to the first dimming cumulative data, based on the fifth correspondence with the color and the first dimming cumulative data corresponding to the color, determine the current temperature state of the light-emitting unit connected to the color output channel of the color in each dimmer.

[0314] Step S1003: If the current temperature state is a high temperature state, determine whether the duration of the high temperature state is greater than the preset duration threshold. If yes, proceed to step S1004; otherwise, proceed to step S1006.

[0315] Step S1004: For the current temperature state of the light-emitting unit corresponding to any color, based on the sixth correspondence with the color and the current temperature values ​​of the multiple light-emitting units corresponding to the color, determine the first dimming compensation data corresponding to the multiple light-emitting units of the color.

[0316] Step S1005: For the first dimming compensation data corresponding to the light-emitting unit of any color, reduce the dimming data corresponding to the color output channel of that color in the current image frame to obtain the target dimming data, and update the corresponding first dimming cumulative data using the target dimming data.

[0317] Step S1006: The dimming data corresponding to the color output channel of the current image frame is directly used as the target dimming data, and the corresponding first dimming cumulative data is updated using the target dimming data.

[0318] Furthermore, in the color backlight unit structure, when performing aging compensation operations on the light-emitting units, similar to the high-temperature compensation mentioned above, it is also necessary to perform the operation separately for each color, as follows:

[0319] In some embodiments, in the color backlight unit architecture, during the process of accumulating dimming data to obtain the second dimming cumulative data, the dimming data for each color is accumulated separately. Specifically, within the second time period, the dimming data corresponding to each of the multiple color output channels corresponding to the same color is accumulated. Since the output channel is a color output channel, and each output channel is connected to a light-emitting unit of one color and receives dimming data of one color, by accumulating the dimming data corresponding to each output channel, the accumulation operation of dimming data for each color can be realized. At this time, the generated second dimming cumulative data is the dimming cumulative data for the corresponding color. Furthermore, its specific implementation method is similar to the implementation method of accumulating the first dimming data corresponding to step S501-1, and can be referred to the implementation method of the embodiment corresponding to step S501-1, so it will not be described again.

[0320] In some embodiments, the second dimming cumulative data obtained in the color backlight unit architecture is the second dimming cumulative data of the target color; specifically, the current aging state of the target light-emitting unit can be determined in the following ways:

[0321] The display chip can determine the third target correspondence among multiple seventh correspondences based on the target color of the second dimming cumulative data, and determine the current aging state based on the third target correspondence and the second dimming cumulative data of the target color. The multiple seventh correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the aging state of the corresponding color light-emitting unit.

[0322] For example, assuming the color backlight unit is a three-color backlight unit of R, G, and B, then three seventh correspondences are set accordingly, namely the seventh correspondence of R color, the seventh correspondence of G color, and the seventh correspondence of B color.

[0323] In practical implementation, if the second dimming cumulative data is the dimming cumulative data for color R, the display chip will use the seventh correspondence of color R as the third target correspondence, and determine the aging state corresponding to the second dimming cumulative data in the third target correspondence based on the second dimming cumulative data. The determined aging state will then be used as the current aging state of the target light-emitting unit. The same process is performed on each color separately to obtain the current aging state corresponding to each color's light-emitting unit.

[0324] In some embodiments, after obtaining the current aging state of each color light-emitting unit, the display chip can determine the second dimming compensation data in the following manner:

[0325] Based on the target color, the fourth target correspondence is determined among multiple eighth correspondences, and the second dimming compensation data is determined based on the fourth target correspondence and the current aging state; wherein, the multiple eighth correspondences are used to characterize the correspondence between the aging state of different color light-emitting units and the dimming compensation data.

[0326] For example, assuming the color backlight unit is a three-color backlight unit of R, G, and B, then three eighth correspondences are set accordingly, namely the eighth correspondence of R color, the eighth correspondence of G color, and the eighth correspondence of B color.

[0327] In practical implementation, if the current temperature state is predicted based on the second dimming cumulative data of color R, the display chip will use the eighth correspondence of color R as the fourth target correspondence, and determine the dimming compensation data corresponding to the current aging state in the second target correspondence based on the current aging state of the target light-emitting unit. This determined dimming compensation data will then be used as the second dimming compensation data. The same process is performed on each color separately to obtain the second dimming compensation data corresponding to each color's light-emitting unit.

[0328] In some embodiments, after obtaining the second dimming compensation data, the display chip can use the first dimming compensation data and the second dimming compensation data to compensate the dimming data corresponding to the corresponding output channel in the current image frame to obtain the target dimming data, and use the target dimming data to control the brightness of the corresponding light-emitting unit.

[0329] It should be noted that when using the first dimming compensation data and the second dimming compensation data to compensate the dimming data corresponding to the corresponding output channel in the current image frame, the specific compensation method can be referred to the implementation method of the embodiment corresponding to step S804, and will not be repeated here.

[0330] In some embodiments, after obtaining the target dimming data, the display chip will also perform accumulation processing on the target dimming data and the second dimming cumulative data, and update the second dimming cumulative data according to the accumulation result.

[0331] In the above embodiments, in the color backlight unit architecture, the current aging state of the target light-emitting unit is predicted by using the third target correspondence relationship corresponding to the target color and the first cumulative data of the target color. The second dimming compensation data corresponding to the target light-emitting unit is determined by using the fourth target correspondence relationship corresponding to the target color and the current aging state. The dimming compensation data is then used to compensate the dimming data corresponding to the target light-emitting unit in the current image frame, so that the light-emitting brightness of the light-emitting units of different colors that have been reduced due to their own aging is restored to normal, ensuring the HDR requirements of the display device and improving the display effect of the display device.

[0332] Figure 11A schematic diagram illustrating a complete workflow for aging compensation of a color backlight unit according to an embodiment of the present invention is shown. Figure 11 As shown, it may include the following steps:

[0333] Step S1101: For each color, the dimming data corresponding to each color output channel is accumulated to obtain the second dimming accumulated data for each color.

[0334] Step S1102: For any color, based on the first dimming cumulative data, and according to the seventh correspondence with the color and the second dimming cumulative data, determine the current aging state of the light-emitting unit connected to the color output channel of the color in each dimmer.

[0335] Step S1103: For the current aging state of the light-emitting unit corresponding to any color, based on the eighth correspondence with the color and the current aging state of the multiple light-emitting units corresponding to the color, determine the second dimming compensation data corresponding to the multiple light-emitting units of the color.

[0336] Step S1104: For the first dimming compensation data and the second dimming compensation data corresponding to the light-emitting unit of any color, adjust the dimming data mechanical energy corresponding to the color output channel of that color in the current image frame to obtain target dimming data, and update the corresponding second dimming cumulative data using the target dimming data.

[0337] Based on the same concept, this embodiment of the invention also provides a display chip. Since this display chip is the same display chip in the backlight control method of this embodiment of the invention, and the principle of the display chip in solving the problem is similar to that of the backlight control method, the implementation of this display chip can refer to the implementation of the backlight control method, and the repeated parts will not be described again.

[0338] Figure 12 A schematic diagram of the structure of a display chip provided in an embodiment of the present invention is shown. Figure 12 As shown, the display chip 400 in this embodiment of the invention may include:

[0339] The state prediction module 410 is used to determine the current temperature state of the target light-emitting unit based on the dimming data corresponding to the target output channel in multiple first image frames.

[0340] The compensation processing module 420 is used to determine target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame, and to control the backlight brightness of the target light-emitting unit according to the target dimming data.

[0341] Wherein, the plurality of first image frames are a plurality of image frames that have been displayed within a first time period, the target output channel is any one of the plurality of output channels of the dimmer, and the target light-emitting unit is a light-emitting unit connected to the target output channel.

[0342] In some embodiments, the state prediction module 410 is specifically used for:

[0343] The first dimming cumulative data is determined based on the dimming data corresponding to the target output channel in multiple first image frames;

[0344] Based on the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined.

[0345] In some embodiments, the state prediction module 410 is specifically used for:

[0346] Based on the first correspondence and the first dimming cumulative data, the current temperature value of the target light-emitting unit is determined, wherein the first correspondence is used to characterize the correspondence between the dimming cumulative data and the temperature value;

[0347] Compare the preset temperature threshold with the current temperature value. If the current temperature value is greater than or equal to the preset temperature threshold, then determine that the current temperature state is a high temperature state.

[0348] If the current temperature value is less than the preset temperature threshold, then the current temperature state is determined to be a normal temperature state.

[0349] In some embodiments, the state prediction module 410 is specifically used for:

[0350] Based on the first correspondence and the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined;

[0351] The first correspondence is used to characterize the correspondence between dimming cumulative data and temperature status, and the temperature status includes at least normal temperature status and high temperature status.

[0352] In some embodiments, an image frame corresponds to multiple dimming data, and one dimming data is used to control a light-emitting unit connected to an output channel of the dimmer.

[0353] The state prediction module 410 is specifically used for:

[0354] The dimming data corresponding to the target output channel in multiple first image frames are accumulated to obtain the first dimming accumulated data.

[0355] The start time of the first time period is no earlier than the power-on time of the display device, and the end time of the first time period is no later than the power-off time of the display device.

[0356] In some embodiments, the dimming data includes current data and PWM data, and the first dimming cumulative data includes first current cumulative data and / or first PWM cumulative data;

[0357] The state prediction module 410 is specifically used for:

[0358] The current data in the dimming data corresponding to the target output channel is accumulated to obtain the first accumulated current data.

[0359] And / or, accumulate the PWM data in the dimming data corresponding to the target output channel to obtain the first PWM accumulated data.

[0360] In some embodiments, the compensation processing module 420 is specifically used for:

[0361] When the current temperature is determined to be a normal temperature, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data.

[0362] When the current temperature state is determined to be a high temperature state, the first dimming compensation data corresponding to the target unit is determined based on the high temperature state, and the dimming data corresponding to the target output channel in the current image frame is adjusted according to the first dimming compensation data to obtain the target dimming data.

[0363] In some embodiments, the compensation processing module 420 is specifically used for:

[0364] Compare the preset duration threshold with the duration of the high-temperature state;

[0365] When it is determined that the duration of the high-temperature state exceeds the preset duration threshold, the first dimming compensation data is determined based on the second correspondence and the current temperature value of the target light-emitting unit.

[0366] The second correspondence is used to characterize the correspondence between temperature values ​​and dimming compensation data.

[0367] In some embodiments, the compensation processing module 420 is further configured to:

[0368] When the duration of the high-temperature state is less than or equal to the preset duration threshold, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data.

[0369] In some embodiments, the compensation processing module 420 is specifically used for:

[0370] Using the first dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is reduced to obtain the target dimming data;

[0371] The first dimming compensation data is generated when the duration of the high-temperature state exceeds a preset duration threshold.

[0372] In some embodiments, the state prediction module 410 is further configured to: determine the current aging state of the target light-emitting unit based on the dimming data corresponding to the target output channel in a plurality of second image frames, wherein the plurality of second image frames are a plurality of image frames that have been displayed within a second time period;

[0373] The compensation processing module 420 is also used to: determine the target dimming data based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame.

[0374] In some embodiments, the state prediction module 410 is specifically used for:

[0375] Based on the dimming data corresponding to the target output channel in multiple second image frames, the second dimming cumulative data is determined, wherein the start time of the second time period is the first power-on time of the display device;

[0376] Based on the second dimming cumulative data, the current aging state of the target light-emitting unit is determined.

[0377] In some embodiments, the state prediction module 410 is specifically used for:

[0378] Based on the third correspondence and the second dimming cumulative data, the current aging state is determined. The third correspondence is used to characterize the correspondence between the dimming cumulative data and the aging state of the light-emitting unit.

[0379] In some embodiments, the compensation processing module 420 is specifically used for:

[0380] Based on the current temperature state, determine the first dimming compensation data corresponding to the target unit, and based on the current aging state, determine the second dimming compensation data corresponding to the target unit.

[0381] Based on the first dimming compensation data and the second dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is adjusted to obtain the target dimming data.

[0382] In some embodiments, the compensation processing module 420 is specifically used for:

[0383] Based on the fourth correspondence and the current aging state, the second dimming compensation data is determined, wherein the fourth correspondence is used to characterize the correspondence between the aging state of the light-emitting unit and the dimming compensation data.

[0384] In some embodiments, the multiple output channels of the dimmer are color output channels, the first dimming cumulative data is the first dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel;

[0385] The state prediction module 410 is specifically used for:

[0386] Based on the target color, the first target correspondence is determined among multiple fifth correspondences, and based on the first target correspondence and the first dimming cumulative data of the target color, the current temperature state of the target light-emitting unit is determined;

[0387] Among them, multiple fifth correspondences are used to characterize the correspondence between the cumulative dimming data of different colors and the temperature state, and the temperature state includes at least the high temperature state and the normal temperature state.

[0388] In some embodiments, the compensation processing module 420 is specifically used for:

[0389] Compare the duration of the high-temperature state with the preset duration threshold;

[0390] When it is determined that the duration of the high temperature state exceeds the preset duration threshold, the second target correspondence is determined from multiple sixth correspondences based on the target color, and the first dimming compensation data is determined based on the second target correspondence and the current temperature value of the target light-emitting unit.

[0391] Among them, multiple sixth correspondences are used to characterize the correspondence between the temperature value and dimming compensation data of different color light-emitting units. The current temperature value is determined based on the first dimming cumulative data of the target color.

[0392] In some embodiments, the multiple output channels of the dimmer are color output channels, the second dimming cumulative data is the second dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel;

[0393] The state prediction module 410 is specifically used for:

[0394] Based on the second dimming cumulative data, the current aging state of the target light-emitting unit is determined, and based on the current aging state, the second dimming compensation data is determined, including:

[0395] Based on the target color, the third target correspondence is determined among multiple seventh correspondences, and the current aging state is determined based on the third target correspondence and the second dimming cumulative data of the target color;

[0396] Among them, multiple seventh correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the aging state of the corresponding color light-emitting units;

[0397] The compensation processing module 420 is specifically used for:

[0398] Based on the target color, determine the fourth target correspondence among multiple eighth correspondences, and determine the second dimming compensation data based on the fourth target correspondence and the current aging state;

[0399] Among them, multiple eighth correspondences are used to characterize the correspondence between the aging state of different color light-emitting units and dimming compensation data.

[0400] Based on the same concept, this embodiment of the invention also provides a backlight module. The principle of the backlight module in solving the problem is similar to that of the aforementioned display chip. Therefore, the implementation of the backlight module can refer to the implementation of the aforementioned display chip, and the repeated parts will not be described again.

[0401] The backlight module provided in this embodiment of the invention may include multiple light-emitting units and a display chip as provided in any of the above embodiments, wherein:

[0402] The display chip is electrically connected to multiple light-emitting units;

[0403] The light-emitting unit is used to turn on the backlight based on the target dimming data it receives.

[0404] In this embodiment of the invention, the display chip can be a SoC, TCON, MCU, dimming controller, dimmer, or other chip. It can be flexibly adjusted according to the actual design architecture of the display device. This embodiment of the invention does not impose any restrictions on this.

[0405] In specific implementation, in the embodiments of the present invention, other essential components of the backlight module are those that should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limitations on the present invention.

[0406] In specific implementation, in the embodiments of the present invention, other essential components of the backlight control module are all those that should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limitations on the present invention.

[0407] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0408] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A backlight control method, characterized in that, include: The current temperature state of the target light-emitting unit is determined based on the dimming data corresponding to the target output channel in multiple first image frames. The multiple first image frames are multiple image frames that have been displayed within a first time period, the target output channel is any one of the multiple output channels of the dimmer, and the target light-emitting unit is a light-emitting unit connected to the target output channel. Based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame, target dimming data is determined, and the backlight brightness of the target light-emitting unit is controlled according to the target dimming data; The step of determining the target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame includes: When the current temperature state is determined to be a high temperature state, and the duration of the high temperature state is greater than a preset duration threshold, the first dimming compensation data corresponding to the target light-emitting unit is determined according to the second correspondence and the current temperature value of the target light-emitting unit, wherein the second correspondence is used to characterize the correspondence between the temperature value and the dimming compensation data; Based on the first dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is adjusted to obtain the target dimming data.

2. The method as described in claim 1, characterized in that, The step of determining the current temperature state of the target light-emitting unit based on the dimming data corresponding to the target output channel in multiple first image frames includes: The first dimming cumulative data is determined based on the dimming data corresponding to the target output channel in the plurality of first image frames; Based on the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined.

3. The method as described in claim 2, characterized in that, Determining the current temperature state of the target light-emitting unit based on the first dimming cumulative data includes: Based on the first correspondence and the first dimming cumulative data, the current temperature value of the target light-emitting unit is determined, wherein the first correspondence is used to characterize the correspondence between the dimming cumulative data and the temperature value; Compare the preset temperature threshold with the current temperature value. If the current temperature value is greater than or equal to the preset temperature threshold, then determine that the current temperature state is a high temperature state. If the current temperature value is less than the preset temperature threshold, then the current temperature state is determined to be a normal temperature state.

4. The method as described in claim 2, characterized in that, Determining the current temperature state of the target light-emitting unit based on the first dimming cumulative data includes: Based on the first correspondence and the first dimming cumulative data, the current temperature state of the target light-emitting unit is determined; The first correspondence is used to characterize the correspondence between dimming cumulative data and temperature status, and the temperature status includes at least normal temperature status and high temperature status.

5. The method as described in claim 2, characterized in that, One image frame corresponds to multiple dimming data, and one dimming data is used to control the light-emitting unit connected to one output channel of the dimmer. The step of determining the first dimming cumulative data based on the dimming data corresponding to the target output channel in multiple first image frames includes: The dimming data corresponding to the target output channel in the plurality of first image frames are accumulated to obtain the first dimming accumulated data; The start time of the first time period is no earlier than the power-on time of the display device, and the end time of the first time period is no later than the power-off time of the display device.

6. The method as described in claim 5, characterized in that, The dimming data includes current data and pulse width modulation (PWM) data, and the first dimming cumulative data includes first current cumulative data and / or first PWM cumulative data. The step of accumulating the dimming data corresponding to the target output channel in the plurality of first image frames to obtain the dimming accumulated data includes: The current data in the dimming data corresponding to the target output channel is accumulated to obtain the first accumulated current data. And / or, the PWM data in the dimming data corresponding to the target output channel is accumulated to obtain the first PWM accumulated data.

7. The method as described in claim 1, characterized in that, The step of determining the target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame includes: When the current temperature state is determined to be a normal temperature state, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data.

8. The method as described in claim 1, characterized in that, The method further includes: When the current temperature state is determined to be a high temperature state, and the duration of the high temperature state is less than or equal to the preset duration threshold, the dimming data corresponding to the target output channel in the current image frame is used as the target dimming data.

9. The method as described in claim 1, characterized in that, The step of adjusting the dimming data corresponding to the target output channel in the current image frame according to the first dimming compensation data to obtain the target dimming data includes: Using the first dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is reduced to obtain the target dimming data; The first dimming compensation data is generated when the duration of the high-temperature state exceeds a preset duration threshold.

10. The method according to any one of claims 1 to 9, characterized in that, Also includes: The current aging state of the target light-emitting unit is determined based on the dimming data corresponding to the target output channel in multiple second image frames, wherein the multiple second image frames are multiple image frames that have been displayed within a second time period; The target dimming data is determined based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame.

11. The method as described in claim 10, characterized in that, Determining the current aging state of the target light-emitting unit based on the dimming data corresponding to the target output channel in multiple second image frames includes: Based on the dimming data corresponding to the target output channel in the plurality of second image frames, the second dimming cumulative data is determined, wherein the starting time of the second time period is the first power-on time of the display device; Based on the second dimming cumulative data, the current aging state of the target light-emitting unit is determined.

12. The method as described in claim 11, characterized in that, Determining the current aging state of the target light-emitting unit based on the second dimming cumulative data includes: Based on the third correspondence and the second dimming cumulative data, the current aging state is determined, wherein the third correspondence is used to characterize the correspondence between the dimming cumulative data and the aging state of the light-emitting unit.

13. The method as described in claim 11, characterized in that, The step of determining the target dimming data based on the current aging state, the current temperature state, and the dimming data corresponding to the target output channel in the current image frame includes: Based on the current temperature state, determine the first dimming compensation data corresponding to the target light-emitting unit, and based on the current aging state, determine the second dimming compensation data corresponding to the target light-emitting unit; Based on the first dimming compensation data and the second dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is adjusted to obtain the target dimming data.

14. The method as described in claim 13, characterized in that, Based on the current aging state, the second dimming compensation data corresponding to the target light-emitting unit is determined. The second dimming compensation data is determined based on the fourth correspondence and the current aging state, wherein the fourth correspondence is used to characterize the correspondence between the aging state of the light-emitting unit and the dimming compensation data.

15. The method according to any one of claims 7 to 9, characterized in that, The multiple output channels of the dimmer are color output channels, the first dimming cumulative data is the first dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel; Determining the current temperature state of the target light-emitting unit based on the first dimming cumulative data includes: Based on the target color, a first target correspondence is determined among multiple fifth correspondences, and based on the first target correspondence and the first dimming cumulative data of the target color, the current temperature state of the target light-emitting unit is determined; The plurality of fifth correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the temperature state, wherein the temperature state includes at least a high temperature state and a normal temperature state. The step of determining the first dimming compensation data corresponding to the target light-emitting unit based on the high-temperature state includes: Compare the duration of the high-temperature state with a preset duration threshold; When it is determined that the duration of the high temperature state is greater than the preset duration threshold, a second target correspondence is determined among multiple sixth correspondences based on the target color, and the first dimming compensation data is determined based on the second target correspondence and the current temperature value of the target light-emitting unit. The plurality of sixth correspondences are used to characterize the correspondence between the temperature values ​​of different color light-emitting units and the dimming compensation data, and the current temperature value is determined based on the first dimming cumulative data of the target color.

16. The method according to any one of claims 13-14, characterized in that, The multiple output channels of the dimmer are color output channels, the second dimming cumulative data is the second dimming cumulative data of the target color, and the target color is the emission color of the target light-emitting unit connected to the target output channel; Determining the current aging state of the target light-emitting unit based on the second dimming cumulative data includes: Based on the target color, a third target correspondence is determined among multiple seventh correspondences, and the current aging state is determined based on the third target correspondence and the second dimming cumulative data of the target color; Among them, the plurality of seventh correspondences are used to characterize the correspondence between the dimming cumulative data of different colors and the aging state of the corresponding color light-emitting unit; The step of determining the second dimming compensation data corresponding to the target light-emitting unit based on the current aging state includes: Based on the target color, a fourth target correspondence is determined among multiple eighth correspondences, and based on the fourth target correspondence and the current aging state, the second dimming compensation data is determined; The plurality of eighth correspondences are used to characterize the correspondence between the aging state of different color light-emitting units and the dimming compensation data.

17. A display chip, characterized in that, include: The state prediction module is used to determine the current temperature state of the target light-emitting unit based on the dimming data corresponding to the target output channel in multiple first image frames. The multiple first image frames are multiple image frames that have been displayed within a first time period, the target output channel is any one of the multiple output channels of the dimmer, and the target light-emitting unit is a light-emitting unit connected to the target output channel. The compensation processing module is used to determine target dimming data based on the current temperature state and the dimming data corresponding to the target output channel in the current image frame, and to control the backlight brightness of the target light-emitting unit according to the target dimming data. Specifically, the compensation processing module is used for: When the current temperature state is determined to be a high temperature state, and the duration of the high temperature state is greater than a preset duration threshold, the first dimming compensation data corresponding to the target light-emitting unit is determined according to the second correspondence and the current temperature value of the target light-emitting unit, wherein the second correspondence is used to characterize the correspondence between the temperature value and the dimming compensation data; Based on the first dimming compensation data, the dimming data corresponding to the target output channel in the current image frame is adjusted to obtain the target dimming data.

18. A backlight module, characterized in that, It includes multiple light-emitting units and a display chip as described in claim 17, wherein: The display chip is electrically connected to the plurality of light-emitting units; The light-emitting unit is used to turn on the backlight according to the target dimming data it receives.

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