A backlight control method, display chip, backlight module and display device

Abstract

The application discloses a backlight control method, a display chip, a backlight module and a display device. The first temperature for representing the current temperature of the light adjuster is acquired, the target color coordinate offset of the target light emitting unit is determined based on the first temperature and the light emitting color of the target light emitting unit, the target current data is determined based on the target color coordinate offset and the initial current data of the target light emitting unit, and the light emitting brightness of the target light emitting unit is controlled according to the target current data, so that in the working process of the color backlight system, the negative influence of the temperature change on the color coordinate stability of the light emitting unit is effectively overcome, the color drift is inhibited, and the stable implementation of the high color gamut and high color accuracy display is ensured.

Description

Technical Field

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

[0002] With the rapid development of display backlight technology, the backlight system, as the core component determining the color performance of the displayed image, has evolved from traditional monochrome backlighting to color backlighting to further improve the color gamut coverage and color reproduction accuracy of display devices. In color backlighting systems, the structure of the light-emitting units has changed: in traditional monochrome backlighting, a single light-emitting unit contains only one monochrome LED (such as a white LED), while a single light-emitting unit in color backlighting is usually composed of multiple LEDs of different colors (such as red, green, and blue LEDs), or multiple color LEDs are packaged into one unit through integration technology to achieve rich color output through light mixing.

[0003] Currently, color backlight systems typically use a constant current drive to control the light-emitting units. However, the temperature of the light-emitting units gradually increases due to external factors (such as their own power consumption and ambient temperature). Temperature changes directly affect the light-emitting characteristics of the units; that is, an increase in the unit's temperature causes a shift in its color coordinates. Furthermore, different primary color LEDs generally have varying sensitivities to temperature, further exacerbating the instability of color mixing. This results in the actual output color of the light-emitting units deviating from the preset target value, a phenomenon known as "color cast." This color deviation directly affects the accuracy of color display, leading to noticeable color distortion in the final image and a significant reduction in the overall display quality of the display device. Summary of the Invention

[0004] This invention provides a backlight control method, a display chip, a backlight module, and a display device to solve the problem of color coordinate drift caused by temperature changes in the prior art. How to effectively overcome the negative impact of temperature changes on the stability of the color coordinates of the light-emitting units during the operation of a color backlight system, suppress color drift, and thus ensure the stable realization of high color gamut and high color accuracy displays has become a key technical problem urgently needing to be solved in this field.

[0005] In a first aspect, embodiments of the present invention provide a backlight control method, comprising: Obtain a first temperature, wherein the first temperature is used to characterize the current temperature of the dimmer; Based on the first temperature and the emission color of the target emission unit itself, the target color coordinate offset corresponding to the target emission unit is determined, wherein the target emission unit is an emission unit electrically connected to the dimmer; Based on the target color coordinate offset and the initial current data of the target light-emitting unit, the target current data is determined, and the luminous brightness of the target light-emitting unit is controlled based on the target current data.

[0006] In a backlight control method provided by this invention, a first temperature is obtained to characterize the current temperature of the dimmer. Based on the first temperature and the emission color of the target emission unit, the target color coordinate offset corresponding to the target emission unit is determined. Based on the target color coordinate offset and the initial current data of the target emission unit, target current data is determined. Based on the target current data, the emission brightness of the target emission unit is controlled. Thus, during the operation of the color backlight system, the negative impact of temperature changes on the stability of the color coordinates of the emission unit is effectively overcome, color drift is suppressed, and high color gamut and high color accuracy display are ensured to be stably achieved.

[0007] In an optional embodiment, determining the target color coordinate offset corresponding to the target light-emitting unit based on the first temperature and the emission color of the target light-emitting unit itself includes: A second temperature is determined based on the first temperature, wherein the first temperature is determined by the temperature monitoring unit inside the dimmer, and the second temperature is used to characterize the current temperature of the target light-emitting unit; The target color coordinate offset is determined based on the second temperature and the emission color of the target light-emitting unit itself.

[0008] The above method, after determining a first temperature to characterize the current temperature of the dimmer, determines a second temperature to characterize the current temperature of the target light-emitting unit based on the first temperature. This allows the target color coordinate offset to be determined based on the emission color of the target light-emitting unit itself and the second temperature. Furthermore, the target current data is determined based on the target color coordinate offset, thereby more accurately overcoming the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit and suppressing color drift.

[0009] In an optional embodiment, determining the target color coordinate offset based on the second temperature and the emission color of the target light-emitting unit itself includes: Based on the emission color of the target light-emitting unit itself, a first target correspondence is selected from multiple first correspondences, wherein the multiple first correspondences are used to characterize the correspondence between temperature and color coordinates of light-emitting units with different emission colors, and the number of first correspondences is consistent with the number of emission colors of the light-emitting unit; Based on the correspondence between the second temperature and the first target, the target color coordinate offset is determined.

[0010] The above method, after determining the emission color of the target light-emitting unit itself, determines the first correspondence with the reflected color, and then determines the target color coordinate offset based on the second temperature and the first target correspondence used to characterize the current temperature of the target light-emitting unit, thereby overcoming the influence of color drift of the light-emitting unit caused by temperature changes.

[0011] In an optional embodiment, determining the target color coordinate offset based on the correspondence between the second temperature and the first target includes: The color coordinates corresponding to the second temperature in the first target correspondence are used as the current color coordinates of the target light-emitting unit. The color coordinates corresponding to the preset reference temperature in the first target correspondence are used as the reference color coordinates corresponding to the target light-emitting unit; The difference between the current color coordinates and the reference color coordinates is used as the target color coordinate offset.

[0012] The above method uses the difference between the color coordinates corresponding to the second temperature and the color coordinates corresponding to the reference temperature as the target color coordinate offset. This allows for a more accurate determination of the target color coordinate offset based on temperature changes, which in turn allows for the determination of the target current data based on the target color coordinate offset. This effectively overcomes the influence of temperature changes on the color drift of the light-emitting unit.

[0013] In one optional embodiment, determining the second temperature based on the first temperature includes: A third temperature is determined based on the first temperature and the first power, wherein the first power is determined based on the current operating current of the dimmer and the target channel voltage, the target channel voltage being the channel voltage in the dimmer corresponding to the target light-emitting unit, and the third temperature being used to characterize the current temperature of the substrate area carrying the dimmer; The second temperature is determined based on the third temperature and the second power, wherein the second power is used to characterize the current power of the target light-emitting unit.

[0014] The above method determines a third temperature based on a first temperature and a first power, and then determines a second temperature based on the third temperature and a second power. This allows for a more accurate determination of the second temperature used to characterize the current temperature of the target light-emitting unit, thereby more effectively overcoming the color drift effect of temperature changes on the light-emitting unit based on the second temperature.

[0015] In an optional embodiment, determining the third temperature based on the first temperature and the first power includes: The sum of the first thermal resistance and the second thermal resistance is calculated to obtain the third thermal resistance. The first thermal resistance is used to characterize the junction thermal resistance of the dimmer, and the second thermal resistance is used to characterize the thermal resistance between the package shell of the dimmer and the substrate area supporting the dimmer. Both the first thermal resistance and the second thermal resistance are determined by the first test data. The product of the third thermal resistance and the first power is calculated to obtain the fourth temperature, and the difference between the first temperature and the fourth temperature is taken as the third temperature.

[0016] The above method determines a third thermal resistance based on a first thermal resistance characterizing the junction thermal resistance of the dimmer and a second thermal resistance characterizing the area between the dimmer's encapsulation shell and the substrate carrying the dimmer. The third temperature is further determined based on the third thermal resistance, the first power, and the first temperature. This allows for a more accurate determination of the second temperature, thereby ensuring the stable realization of high color gamut and high color accuracy displays.

[0017] In one alternative embodiment, determining the second temperature based on the third temperature and the second power includes: The product of the fourth thermal resistance and the second power is calculated to obtain the fifth temperature, wherein the fourth thermal resistance is used to characterize the thermal resistance between the packaging shell of the target light-emitting unit and the substrate area supporting the target light-emitting unit, and the fourth thermal resistance is determined by the second test data, and the second power is determined based on the current operating current and operating voltage of the target light-emitting unit; The sum of the third temperature and the fifth temperature is taken as the second temperature.

[0018] The above method determines a fifth temperature based on the thermal resistance and second power between the packaging shell of the target light-emitting unit and the substrate area carrying the target light-emitting unit, and then determines a second temperature based on the fifth temperature, thereby enabling a more accurate determination of the target color coordinate offset based on the second temperature.

[0019] In an optional embodiment, determining the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit includes: Based on the target color coordinate offset and the correspondence between the second target, the current compensation value of the target light-emitting unit is determined, wherein the second target correspondence is used to characterize the correspondence between the color coordinate offset of the light-emitting unit and the current compensation value; The sum of the current compensation value and the initial current data is used as the target current data.

[0020] The above method determines the current compensation value of the target light-emitting unit by the target color coordinate offset and the correspondence between the second target. This allows the initial current data to be compensated based on the current compensation value. As a result, the target light-emitting unit controls its backlight brightness according to the target current data, effectively overcoming the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit and suppressing color drift.

[0021] In an optional embodiment, determining the current compensation value of the target light-emitting unit based on the target color coordinate offset and the correspondence between the target and the second target includes: Based on the emission color of the target light-emitting unit itself, the second target correspondence is selected from a plurality of second correspondences, wherein the plurality of second correspondences are respectively used to characterize the correspondence between the color coordinate offset and the current compensation value of light-emitting units with different emission colors, and the number of the second correspondences is consistent with the number of emission colors of the light-emitting unit; The current compensation value corresponding to the target color coordinate offset in the second target correspondence is used as the current compensation value of the target light-emitting unit.

[0022] The above method selects a second target correspondence from multiple second correspondences based on the emission color of the target light-emitting unit, and determines the current compensation value based on the second target correspondence, thereby more accurately determining the current compensation value. This effectively overcomes the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit, suppresses color drift, and ensures the stable realization of high color gamut and high color accuracy display.

[0023] In a second aspect, embodiments of the present invention provide a display chip, comprising: A temperature acquisition module is used to acquire a first temperature, wherein the first temperature is used to characterize the current temperature of the dimmer; An offset determination module is used to determine the target color coordinate offset of the target light-emitting unit based on the first temperature and the light emission color of the target light-emitting unit itself, wherein the target light-emitting unit is a light-emitting unit electrically connected to the dimmer; The current adjustment module is used to determine the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and to control the light emission brightness of the target light-emitting unit based on the target current data.

[0024] In one optional embodiment, the display chip is any one of a system-on-a-chip, a timing control chip, or a dimming control chip.

[0025] In an optional embodiment, the offset determination module is specifically used for: A second temperature is determined based on the first temperature, wherein the first temperature is determined by the temperature monitoring unit inside the dimmer, and the second temperature is used to characterize the current temperature of the target light-emitting unit; The target color coordinate offset is determined based on the second temperature and the emission color of the target light-emitting unit itself.

[0026] In an optional embodiment, the offset determination module is specifically used for: Based on the emission color of the target light-emitting unit itself, a first target correspondence is selected from multiple first correspondences, wherein the multiple first correspondences are used to characterize the correspondence between temperature and color coordinates of light-emitting units with different emission colors, and the number of first correspondences is consistent with the number of emission colors of the light-emitting unit; Based on the correspondence between the second temperature and the first target, the target color coordinate offset is determined.

[0027] In an optional embodiment, the offset determination module is specifically used for: The color coordinates corresponding to the second temperature in the first target correspondence are used as the current color coordinates of the target light-emitting unit. The color coordinates corresponding to the preset reference temperature in the first target correspondence are used as the reference color coordinates corresponding to the target light-emitting unit; The difference between the current color coordinates and the reference color coordinates is used as the target color coordinate offset.

[0028] In an optional embodiment, the offset determination module is specifically used for: A third temperature is determined based on the first temperature and the first power, wherein the first power is determined based on the current operating current of the dimmer and the target channel voltage, the target channel voltage being the channel voltage in the dimmer corresponding to the target light-emitting unit, and the third temperature being used to characterize the current temperature of the substrate area carrying the dimmer; The second temperature is determined based on the third temperature and the second power, wherein the second power is used to characterize the current power of the target light-emitting unit.

[0029] In an optional embodiment, the offset determination module is specifically used for: The sum of the first thermal resistance and the second thermal resistance is calculated to obtain the third thermal resistance. The first thermal resistance is used to characterize the junction thermal resistance of the dimmer, and the second thermal resistance is used to characterize the thermal resistance between the package shell of the dimmer and the substrate area supporting the dimmer. Both the first thermal resistance and the second thermal resistance are determined by the first test data. The product of the third thermal resistance and the first power is calculated to obtain the fourth temperature, and the difference between the first temperature and the fourth temperature is taken as the third temperature.

[0030] In an optional embodiment, the offset determination module is specifically used for: The product of the fourth thermal resistance and the second power is calculated to obtain the fifth temperature, wherein the fourth thermal resistance is used to characterize the thermal resistance between the packaging shell of the target light-emitting unit and the substrate area supporting the target light-emitting unit, and the fourth thermal resistance is determined by the second test data, and the second power is determined based on the current operating current and operating voltage of the target light-emitting unit; The sum of the third temperature and the fifth temperature is taken as the second temperature.

[0031] In one optional embodiment, the current regulation module is specifically used for: Based on the target color coordinate offset and the correspondence between the second target, the current compensation value of the target light-emitting unit is determined, wherein the second target correspondence is used to characterize the correspondence between the color coordinate offset of the light-emitting unit and the current compensation value; The sum of the current compensation value and the initial current data is used as the target current data.

[0032] In one optional embodiment, the current regulation module is specifically used for: Based on the emission color of the target light-emitting unit itself, the second target correspondence is selected from a plurality of second correspondences, wherein the plurality of second correspondences are respectively used to characterize the correspondence between the color coordinate offset and the current compensation value of light-emitting units with different emission colors, and the number of the second correspondences is consistent with the number of emission colors of the light-emitting unit; The current compensation value corresponding to the target color coordinate offset in the second target correspondence is used as the current compensation value of the target light-emitting unit.

[0033] Thirdly, embodiments of the present invention provide a backlight module, including a plurality of dimmers, a plurality of light-emitting units, and a display chip as described in any one of the first aspects above, wherein the light-emitting units emit multiple colors, wherein: The display chip is electrically connected to the plurality of dimmers respectively, and one of the dimmers is electrically connected to at least one of the light-emitting units; The dimmer is used to: receive target current data sent by the display chip, and output a target operating current to the light-emitting unit electrically connected to itself based on the target current data; The light-emitting unit is used to emit backlight of corresponding brightness under the drive of the target operating current it receives.

[0034] In one optional embodiment, the dimmer includes a transmission module, a processing module, and a monitoring module, wherein: The transmission module is electrically connected to the processing module and the monitoring module respectively, and the monitoring module includes a temperature monitoring unit; The transmission module is used to: receive target current data sent by the display chip, and send a first temperature to the display chip; The processing module is used to: generate the target operating current based on the target current data, and transmit the target operating current to the light-emitting unit electrically connected to itself; The temperature monitoring unit is used to: monitor the current temperature of the dimmer according to a preset cycle, and generate the first temperature.

[0035] In one optional embodiment, the preset period is consistent with the display period corresponding to N image frames, where N is a positive integer and N≥1.

[0036] Fourthly, embodiments of the present invention provide a display device, including a display module and a backlight module as described in any one of the third aspects, wherein: The display module is used to display image frames based on the backlight provided by the backlight module.

[0037] For the technical effects that the display chip disclosed in the second aspect, the backlight module disclosed in the third aspect, and the display device disclosed in the fourth 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

[0038] 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.

[0039] Figure 1 This is a schematic diagram illustrating an application scenario of a backlight control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a backlight panel provided in an embodiment of the present invention; Figure 3 A schematic flowchart of a backlight control method provided in an embodiment of the present invention; Figure 4(a) is a schematic diagram showing the color coordinates of a red LED as a function of temperature according to an embodiment of the present invention; Figure 4(b) is a schematic diagram showing the color coordinates of a green LED as a function of temperature according to an embodiment of the present invention; Figure 4(c) is a schematic diagram of the color coordinates of a blue LED as a function of temperature according to an embodiment of the present invention; Figure 5 A schematic flowchart of another backlight control method provided in an embodiment of the present invention; Figure 6 A schematic flowchart of another backlight control method provided in an embodiment of the present invention; Figure 7 A schematic flowchart of another backlight control method provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a display chip provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a dimmer provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] In the field of display technology, the backlight system, as a core component determining the color performance of a display image, directly determines the ability to further improve the color gamut coverage and color reproduction accuracy of display devices. With users' ever-increasing demands for display quality, backlight systems have evolved from traditional monochrome backlighting to color backlighting. Compared to monochrome backlighting, color backlighting, through optimized spectral distribution, can significantly improve the color gamut range of display devices and achieve more accurate color reproduction; therefore, it is widely used in various high-end display devices.

[0043] In color backlight systems, the structure of the light-emitting unit has undergone a fundamental change: in traditional monochrome backlights, a single light-emitting unit contains only one monochrome LED (such as a white LED), while a single light-emitting unit in a color backlight is usually composed of multiple LEDs of different colors (such as red, green, and blue LEDs), or multiple colored LEDs are packaged into one unit through integration technology to achieve rich color output through light mixing.

[0044] Currently, color backlight systems generally use a constant current driving method to control the light-emitting unit to emit light. This method provides a stable and constant driving current for each primary color LED to achieve stable light output and color performance.

[0045] However, in practical applications, the temperature of the light-emitting unit (LED) gradually increases due to external factors such as its own power consumption, internal heat dissipation conditions, and ambient temperature. Temperature changes directly affect the LED's luminous characteristics. Specifically, an increase in LED temperature causes a shift in its color coordinates, and different primary color LEDs typically exhibit varying sensitivities to temperature. For example, with red LEDs, increased temperature may cause their wavelength to lengthen, shifting their color coordinates towards a more yellowish hue. This further exacerbates the instability of mixed colors. The direct consequence is that the actual output color of the LED deviates from the preset target value, resulting in a "color cast." This temperature-induced color deviation directly damages the accuracy of color display, leading to noticeable color distortion in the final image and significantly reducing the overall display quality of the display device.

[0046] Specifically, an increase in temperature directly causes changes in key parameters such as carrier behavior, band structure, and phosphor conversion efficiency within the luminescent material or chip, which manifests as a significant shift in the emission color coordinates. Different primary color LEDs often exhibit varying sensitivities to temperature changes (for example, the wavelength shift of red LEDs is typically more pronounced than that of blue LEDs), further exacerbating the risk of deviations in the mixing of white light or the target color.

[0047] Based on this, embodiments of the present invention provide a display control method, a display chip, a backlight module, and a display device. This method involves acquiring a first temperature to characterize the current temperature of the dimmer, determining the target color coordinate offset corresponding to the target light-emitting unit based on the first temperature and the emission color of the target light-emitting unit itself, determining target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and controlling the emission brightness of the target light-emitting unit according to the target current data. This effectively overcomes the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit during the operation of the color backlight system, suppresses color drift, and thus ensures the stable realization of high color gamut and high color accuracy display.

[0048] 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.

[0049] 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: The backlight control method provided in this invention can be applied to display device scenarios, such as liquid crystal display devices. Figure 1 As shown, the display device 100 typically includes a main processor 110, a timing controller 120, a dimming controller 130, a display panel 140, and a backlight panel 150.

[0050] The main processor 110 is connected to the timing controller 120 and the dimming controller 130, respectively. The timing controller 120 is connected to the dimming controller 130 and the display panel 140, respectively. The dimming controller 130 is also connected to the backlight panel 150. The display panel 140 is positioned opposite the backlight panel 150, and the display panel 140 is located on the light-emitting side of the backlight panel 150. For example... Figure 2 The diagram shows a backlight panel according to an embodiment of this application. The backlight panel 150 is provided with a dimmer 151 and light-emitting units 152. For example, one dimmer 151 can be connected to multiple light-emitting units 152. Specifically, the dimmer 151 is electrically connected to the cathode of the light-emitting unit 152, and the anode of the light-emitting unit 152 is electrically connected to the power supply terminal VDD. For example, the light-emitting unit 152 can be a direct-lit AM mini-LED (Active Matrix Mini Light Emitting Diode).

[0051] In specific implementations, the main processor 110 may be a system-on-chip (SoC) or other electronic devices capable of outputting image data, and the embodiments of the present invention do not impose any restrictions on this.

[0052] In practical applications, the timing controller 120 in this embodiment of the invention can be a TCON (Timing Controller) 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.

[0053] Furthermore, the dimming controller 130 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.

[0054] It should be noted that the architecture of the backlight panel 150 in the display device 100 provided in this embodiment of the invention can adopt... Figure 1 The backlight panel architecture shown can also employ other feasible backlight panel architectures, and the embodiments of the present invention do not impose any restrictions on this.

[0055] In a specific implementation, the main processor 110 sends the display data included in the image frame to be displayed to the timing controller 120 and the dimming controller 130, respectively. The timing controller 120 generates local dimming data based on the display data corresponding to an image frame, and sends the local dimming data to the dimming controller 130, as well as sending the display data to the display panel 140. The dimming controller 130 processes the received local dimming data and sends the processed local dimming data to the backlight panel 150. The dimmer 151 in the backlight panel 150 generates PWM local dimming data based on the received local dimming data and sends the PWM local dimming data to the light-emitting unit 152 connected to it, thereby controlling the illumination of the light-emitting unit 152 and providing corresponding backlight to the display panel 140. The display panel 140, based on the received display data and using the backlight provided by the backlight panel 150, can then display the image frame.

[0056] Of course, the methods provided in the embodiments of the present invention are not limited to those described above. Figure 1 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.

[0057] For example, in some other embodiments, after receiving the display data sent by the main processor 110, the timing controller 120 sends the display data to the display panel 140. After receiving the display data sent by the main processor 110, the dimming controller 130 generates local dimming data and sends the local dimming data to the backlight panel 150. The dimmer 151 in the backlight panel 150 generates PWM local dimming data according to the received local dimming data and sends the PWM local dimming data to the light-emitting unit 152 connected to it to control the lighting of the light-emitting unit 152 to provide corresponding backlight for the display panel 140. The display panel 140 can display the image frame according to the received display data and the backlight provided by the backlight panel 150.

[0058] The backlight control method provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings: 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.

[0059] Figure 3 A schematic flowchart of a backlight control method provided in an embodiment of the present invention is shown. Figure 3 As shown, the backlight control method of this embodiment of the invention may specifically include the following steps: Step S301: Obtain a first temperature, wherein the first temperature is used to characterize the current temperature of the dimmer; In a specific embodiment, the first temperature The temperature is determined by the temperature detection unit inside the dimmer, which monitors the temperature in real time and feeds it back to the MCU, SoC, or TCON for processing.

[0060] Step S302: Based on the first temperature and the emission color of the target emission unit itself, determine the target color coordinate offset corresponding to the target emission unit, wherein the target emission unit is the emission unit electrically connected to the dimmer. For example, Table 1 and Figure 4(a) show the color coordinates of a red LED as a function of temperature, respectively, provided in an embodiment of this application. The red LED can be an LED based on an aluminum indium gallium phosphide (AlInGaP) quaternary compound semiconductor material. The unit of temperature is °C, and the unit of brightness is nit.

[0061] Table 1

[0062] Table 2 and Figure 4(b) show the color coordinates of a green LED as a function of temperature, respectively, provided in an embodiment of this application. The green LED can be an LED based on indium-gallium-nitrogen (InGaN) ternary compound semiconductor material. The unit of temperature is °C, and the unit of brightness is nit.

[0063] Table 2

[0064] Table 3 and Figure 4(c) show the color coordinates of a blue LED as a function of temperature, respectively, according to an embodiment of this application. The blue LED can be made of gallium nitride (GaN) semiconductor material. The unit of temperature is °C, and the unit of brightness is nit.

[0065] Table 3

[0066] Specifically, the dimmer is connected to one or more target light-emitting units and is used to adjust the light-emitting units that are electrically connected to the dimmer.

[0067] In one possible implementation, as described above, the color coordinates shift as the temperature of the light-emitting unit changes. Therefore, a first temperature is determined to characterize the current temperature of the dimmer. Then, it is necessary to base it on the first temperature. Determine a second temperature for characterizing the current temperature of the target light-emitting unit. Based on the current temperature Determine the target color coordinate offset. For example... Figure 5 As shown, the steps to determine the target color coordinate offset are as follows: Step S501: Based on the first temperature Determine the second temperature The first temperature is determined by the temperature monitoring unit inside the dimmer, and the second temperature is used to characterize the current temperature of the target light-emitting unit. In a specific embodiment, such as Figure 6 As shown, the steps to determine the second temperature are as follows: S601, based on the first temperature and first power Determine the third temperature .

[0068] Among them, the third temperature Used to characterize the current temperature of the substrate area carrying the dimmer.

[0069] Specifically, the third temperature .

[0070] Understandably, the first power It is determined based on the dimmer's current operating current and the target channel voltage. The target channel voltage is the channel voltage in the dimmer corresponding to the target light-emitting unit. Specifically, the first power... = Current operating current of the dimmer × Target channel voltage of the dimmer. Wherein, the current operating current of the dimmer is determined by the current detection module, and the target channel voltage of the dimmer is determined by the voltage detection module.

[0071] First thermal resistance The junction-to-case thermal resistance (JTR) is used to characterize the thermal resistance of a dimmer. The junction refers to the thermal conduction relationship from the silicon core of the dimmer's bare die to the dimmer's package casing. The JTR is the equivalent thermal resistance of this thermal conduction relationship. In other words, the first thermal resistance... It represents the equivalent thermal resistance between the bare chip junction of the dimmer and its package.

[0072] Second thermal resistance The first thermal resistance is used to characterize the thermal resistance between the package housing of the dimmer and the substrate area carrying the dimmer. Second thermal resistance All of these were determined using the first test data.

[0073] Among them, the first thermal resistance Second thermal resistance The units are all ℃ / W (degrees Celsius per watt). The heat generated during normal chip operation is conducted sequentially from the chip core of the dimmer to the dimmer's package, and from the dimmer's package to the substrate area that carries the dimmer.

[0074] Specifically, the first test data can be a pre-stored first thermal resistance. Second thermal resistance .

[0075] The first test data can also include the current temperature of a region characterizing a constant substrate. =50℃, known power The current temperature of the dimmer The temperature of the dimmer's housing The current temperature of the substrate area carrying the dimmer .

[0076] In a specific embodiment, a known power is applied. Then, the temperature of the dimmer's package housing was obtained. ,because The first thermal resistance can be calculated. .

[0077] Among them, the current temperature of the dimmer The temperature is determined by the temperature detection unit inside the dimmer, which is the temperature of the dimmer's casing. It was determined using an infrared thermal imager.

[0078] Furthermore, when a known power is applied... Determine the first thermal resistance Then, the current temperature of the substrate region characterizing the dimmer is obtained. ,because The second thermal resistance can be calculated. .

[0079] The current temperature of the substrate area carrying the dimmer. It was determined by an infrared thermal imager.

[0080] In summary, in the embodiments of this application, when determining the first thermal resistance... Second thermal resistance Next, calculate the first thermal resistance. Second thermal resistance The sum of the third thermal resistance Calculate the third thermal resistance. With the first power The product of these two values ​​yields the fourth temperature. Therefore, the first temperature With the fourth temperature The difference, as the third temperature Therefore, it is possible to base it on the third temperature. Further determination of the second temperature Therefore, it is possible to base this on the second temperature. By determining the target color coordinate offset, the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit can be overcome more accurately, thus suppressing color drift.

[0081] S602, based on the third temperature Second power Determine the second temperature .

[0082] Among them, the second power Used to characterize the current power of the target emitting unit.

[0083] Understandably, the second power It is determined based on the current operating current and operating voltage of the target light-emitting unit; specifically, the second power... = Current operating current of the target light-emitting unit × Operating voltage of the target light-emitting unit. Wherein, the current operating current of the target light-emitting unit is determined by the current detection module, and the operating voltage of the target light-emitting unit is determined by the voltage detection module.

[0084] Specifically, the second temperature .

[0085] Among them, the third temperature This can be determined through the aforementioned steps. The fourth thermal resistance is used to characterize the thermal resistance between the packaging shell of the target light-emitting unit and the substrate area carrying the target light-emitting unit, and is determined by the second test data.

[0086] Among them, the fourth thermal resistance The unit is ℃ / W (degrees Celsius per watt).

[0087] Specifically, the second test data can be pre-stored as the fourth thermal resistance. .

[0088] The second test data can also include the current temperature of a region characterizing a constant substrate. =50℃, known power The current temperature of the target light-emitting unit .

[0089] In a specific embodiment, a known power is applied. Then, obtain the current temperature of the target light-emitting unit. ,because The fourth thermal resistance can be calculated. .

[0090] Among them, the current temperature of the target light-emitting unit It was determined using an infrared thermal imager.

[0091] In summary, in the embodiments of this application, when determining the fourth thermal resistance... Next, calculate the fourth thermal resistance. The product of this and the second power P2 yields the fifth temperature. The third temperature With the fifth temperature The sum of As the second temperature Therefore, it is possible to base our conclusions on the second temperature. By determining the target color coordinate offset, the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit can be overcome more accurately, thus suppressing color drift.

[0092] Specifically, based on the emission color of the target emission unit itself, a first target correspondence is selected from multiple first correspondences. The multiple first correspondences are used to characterize the correspondence between temperature and color coordinates of emission units with different emission colors. The number of first correspondences is consistent with the number of emission colors of the emission unit. Based on the second temperature and the first target correspondence, the target color coordinate offset is determined.

[0093] For example, as shown in Tables 1, 2, and 3, this application takes the emission colors of the light-emitting unit as red, green, and blue as an example. Therefore, the number of first correspondences is also 3. Table 1 is used to characterize the correspondence between the temperature and color coordinates of the red LED, Table 2 is used to characterize the correspondence between the temperature and color coordinates of the green LED, and Table 3 is used to characterize the correspondence between the temperature and color coordinates of the blue LED. It should be noted that this application only uses red, green, and blue emission colors as an example for illustration, and does not limit the number of emission colors in this application.

[0094] Therefore, in determining the second temperature Then, it can be based on the second temperature Based on the correspondence with the first target, determine the target color coordinate offset.

[0095] Step S502: Determine the target color coordinate offset based on the second temperature and the emission color of the target light-emitting unit itself.

[0096] Specifically, in the correspondence between the first target and the second temperature... The corresponding color coordinates are used as the current color coordinates of the target light-emitting unit, and the color coordinates corresponding to the preset reference temperature in the first target correspondence are used as the reference color coordinates of the target light-emitting unit; the difference between the current color coordinates and the reference color coordinates is used as the target color coordinate offset.

[0097] The reference temperature is preset.

[0098] For example, if the emission color of the target light-emitting unit itself is determined to be red, Table 1 will be used as an example for explanation. If the reference temperature is a preset 25°C, and the determined second temperature... The temperature is 40℃. Looking up the color coordinates corresponding to the reference temperature of 25℃ in Table 1, the x-coordinate of the reference color coordinates is 0.6817, and the y-coordinate is 0.3114. Looking up the color coordinates corresponding to the second temperature in Table 1, the x-coordinate of the current color coordinates is 0.6787, and the y-coordinate is 0.3107. Therefore, the reference color coordinates are determined to be (0.6817, 0.3114), and the current color coordinates are (0.6787, 0.3107). The difference between the current color coordinates (0.6787, 0.3107) and the reference color coordinates (0.6817, 0.3114) (-0.003, -0.0007) is used as the target color coordinate offset.

[0099] For example, if the emission color of the target light-emitting unit itself is determined to be green, Table 2 will be used as an example for explanation. If the reference temperature is a preset 35°C, and the determined second temperature... The temperature is 45℃. Looking up the color coordinates corresponding to the reference temperature of 35℃ in Table 2, the x-coordinate of the reference color coordinates is 0.19086, and the y-coordinate is 0.74665. Looking up the color coordinates corresponding to the second temperature in Table 1, the x-coordinate of the current color coordinates is 0.19483, and the y-coordinate is 0.74348. Therefore, the reference color coordinates are determined to be (0.19086, 0.74665), and the current color coordinates are (0.19483, 0.74348). The difference between the current color coordinates (0.19483, 0.74348) and the reference color coordinates (0.19086, 0.74665), which is (0.00397, -0.00317), is used as the target color coordinate offset.

[0100] For example, if the emission color of the target light-emitting unit itself is determined to be blue, Table 3 will be used as an example for explanation. If the reference temperature is a preset 35°C, and the determined second temperature... The temperature is 45℃. Looking up the color coordinates corresponding to the reference temperature of 35℃ in Table 2, the x-coordinate of the reference color coordinates is 0.29094, and the y-coordinate is 0.10349. Looking up the color coordinates corresponding to the second temperature in Table 1, the x-coordinate of the current color coordinates is 0.28411, and the y-coordinate is 0.10239. Therefore, the reference color coordinates are determined to be (0.29094, 0.10349), and the current color coordinates are (0.28411, 0.10239). The difference between the current color coordinates (0.28411, 0.10239) and the reference color coordinates (0.29094, 0.10349) (-0.00683, -0.0011) is used as the target color coordinate offset.

[0101] Step S303: Determine the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and control the luminous brightness of the target light-emitting unit based on the target current data.

[0102] This application provides a backlight control method that obtains a first temperature to characterize the current temperature of the dimmer, determines the target color coordinate offset of the target light-emitting unit based on the first temperature and the emission color of the target light-emitting unit, determines the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and controls the emission brightness of the target light-emitting unit according to the target current data. This effectively overcomes the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit during the operation of the color backlight system, suppresses color drift, and ensures the stable realization of high color gamut and high color accuracy display.

[0103] In one possible implementation, such as Figure 7 As shown, the specific steps for determining the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit are as follows: Step S701: Determine the current compensation value of the target light-emitting unit based on the target color coordinate offset and the correspondence between the second target and the target, wherein the correspondence between the second target and the target is used to characterize the correspondence between the color coordinate offset and the current compensation value of the light-emitting unit. In a specific embodiment, based on the emission color of the target light-emitting unit itself, a second target correspondence is selected from multiple second correspondences. These multiple second correspondences are used to characterize the correspondence between the color coordinate offset and the current compensation value of light-emitting units with different emission colors. The number of second correspondences is consistent with the number of emission colors of the light-emitting unit. For example, taking the emission colors of the light-emitting unit in this application as red, green, and blue, there are two corresponding second correspondences: a for red, b for green, and c for blue.

[0104] For example, as shown in Tables 4, 5, and 6, this application takes the emission colors of the light-emitting unit as red, green, and blue as an example. Table 4 is used to characterize the second correspondence a between the color coordinate offset of the red LED and the current compensation value; Table 5 is used to characterize the second correspondence b between the color coordinate offset of the green LED and the current compensation value; and Table 6 is used to characterize the second correspondence c between the color coordinate offset of the blue LED and the current compensation value. It should be noted that this application only uses red, green, and blue emission colors as an example for illustration and does not limit the number of emission colors in this application.

[0105] Specifically, Table 4 shows the second correspondence 'a' between the color coordinate offset of the red LED and the current compensation value: Table 4

[0106] Table 5 shows the second correspondence b between the color coordinate offset and the current compensation value for green LEDs: Table 5

[0107] Table 6 shows the second correspondence c between the color coordinate offset and the current compensation value of the blue LED: Table 6

[0108] It is understandable that Tables 4, 5, and 6 are explained using the current input target light-emitting unit operating current of 7.5mA as an example. Table 4 is used to characterize the correspondence between the color coordinate offset of the red LED and the current compensation value under the current current of 7.5mA, Table 5 is used to characterize the correspondence between the color coordinate offset of the green LED and the current compensation value under the current current of 7.5mA, and Table 6 is used to characterize the correspondence between the color coordinate offset of the blue LED and the current compensation value under the current current of 7.5mA.

[0109] Therefore, after determining the emission color and color coordinate offset of the target light-emitting unit, the current compensation value can be determined based on the second correspondence relationship used to characterize the correspondence between the color coordinate offset of the light-emitting unit and the current compensation value.

[0110] For example, if the emission color of the target light-emitting unit itself is determined to be red, then Table 4 is used as an example for explanation. If the target color coordinate offset is determined to be (-0.00054, -0.00021), then according to the second target correspondence relationship a, the current compensation value corresponding to the target color coordinate offset is determined to be 10.318 mA.

[0111] For example, if the emission color of the target light-emitting unit itself is determined to be green, then Table 5 is used as an example for explanation. If the color coordinate offset is determined to be (-0.28229, 0.05627), then according to the second target correspondence relationship b, the current compensation value corresponding to the target color coordinate offset is determined to be 15.007 mA.

[0112] For example, if the emission color of the target light-emitting unit is determined to be blue, Table 6 is used as an example. If the color coordinate offset is determined to be (0.0085, -0.00377), then the current compensation value corresponding to the target color coordinate offset is determined to be 4.69 mA according to the second target correspondence c.

[0113] In a specific embodiment, the current compensation value corresponding to the target color coordinate offset in the second target correspondence is used as the current compensation value of the target light-emitting unit.

[0114] Step S702: Use the sum of the current compensation value and the initial current data as the target current data.

[0115] For example, as shown in Tables 4, 5 and 6, this application uses the current operating current of the current input target light-emitting unit as 7.5mA as an example, that is, the initial current data is 7.5mA.

[0116] Therefore, if the current compensation value is determined to be 10.318 mA, and the initial current data is 7.5 mA, the sum of the current compensation value and the initial current data is used as the target current data, resulting in a target current data of 17.818 mA. The target light-emitting unit then controls its backlight brightness based on this target current data. During the operation of the color backlight system, this effectively overcomes the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit, suppresses color drift, and thus ensures the stable realization of high color gamut and high color accuracy display.

[0117] 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.

[0118] Figure 8 A schematic diagram of the structure of a display chip provided in an embodiment of the present invention is shown. Figure 8 As shown, the display chip in this embodiment of the invention may include: Temperature acquisition module 801 is used to acquire a first temperature, wherein the first temperature is used to characterize the current temperature of the dimmer; The offset determination module 802 is used to determine the target color coordinate offset of the target light-emitting unit based on the first temperature and the light emission color of the target light-emitting unit itself, wherein the target light-emitting unit is a light-emitting unit electrically connected to the dimmer; The current adjustment module 803 is used to determine the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and to control the light emission brightness of the target light-emitting unit based on the target current data.

[0119] A backlight control method for a display chip, a backlight module, and a display device involves acquiring a first temperature to characterize the current temperature of the dimmer, determining the target color coordinate offset of the target light-emitting unit based on the first temperature and the emission color of the target light-emitting unit, determining target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and controlling the emission brightness of the target light-emitting unit according to the target current data. This effectively overcomes the negative impact of temperature changes on the stability of the color coordinates of the light-emitting unit during the operation of the color backlight system, suppresses color drift, and thus ensures the stable realization of high color gamut and high color accuracy display.

[0120] In one optional embodiment, the display chip is any one of a system-on-a-chip (SOC), a timing control chip (TCON), or a dimming control chip (DCON).

[0121] In an optional embodiment, the offset determination module 802 is specifically used for: Based on the first temperature, a second temperature is determined, wherein the first temperature is determined by the temperature monitoring unit inside the dimmer, and the second temperature is used to characterize the current temperature of the target light-emitting unit. The target color coordinate offset is determined based on the second temperature and the emission color of the target emitting unit itself.

[0122] In an optional embodiment, the offset determination module 802 is specifically used for: Based on the emission color of the target light-emitting unit itself, a first target correspondence is selected from multiple first correspondences. The multiple first correspondences are used to characterize the correspondence between temperature and color coordinates of light-emitting units with different emission colors. The number of first correspondences is consistent with the number of emission colors of the light-emitting unit. Based on the correspondence between the second temperature and the first target, the target color coordinate offset is determined.

[0123] In an optional embodiment, the offset determination module 802 is specifically used for: The color coordinates corresponding to the second temperature in the first target correspondence are used as the current color coordinates of the target emitting unit, and The color coordinates corresponding to the preset reference temperature in the first target correspondence are used as the reference color coordinates corresponding to the target light-emitting unit; The difference between the current color coordinates and the reference color coordinates is used as the target color coordinate offset.

[0124] In an optional embodiment, the offset determination module 802 is specifically used for: A third temperature is determined based on a first temperature and a first power, wherein the first power is determined based on the current operating current of the dimmer and the target channel voltage, the target channel voltage being the channel voltage in the dimmer corresponding to the target light-emitting unit, and the third temperature being used to characterize the current temperature of the substrate area carrying the dimmer. The second temperature is determined based on the third temperature and the second power, wherein the second power is used to characterize the current power of the target light-emitting unit.

[0125] In an optional embodiment, the offset determination module 802 is specifically used for: The sum of the first thermal resistance and the second thermal resistance is calculated to obtain the third thermal resistance. The first thermal resistance is used to characterize the junction thermal resistance of the dimmer, and the second thermal resistance is used to characterize the thermal resistance between the dimmer's package shell and the substrate area carrying the dimmer. Both the first thermal resistance and the second thermal resistance are determined by the first test data. Calculate the product of the third thermal resistance and the first power to obtain the fourth temperature, and take the difference between the first temperature and the fourth temperature as the third temperature.

[0126] In an optional embodiment, the offset determination module 802 is specifically used for: The product of the fourth thermal resistance and the second power is calculated to obtain the fifth temperature. The fourth thermal resistance is used to characterize the thermal resistance between the packaging shell of the target light-emitting unit and the substrate area carrying the target light-emitting unit. The fourth thermal resistance is determined by the second test data, and the second power is determined based on the current operating current and operating voltage of the target light-emitting unit. The sum of the third and fifth temperatures is taken as the second temperature.

[0127] In one alternative embodiment, the current regulation module 803 is specifically used for: Based on the target color coordinate offset and the correspondence between the second target, the current compensation value of the target light-emitting unit is determined, wherein the correspondence between the second target is used to characterize the correspondence between the color coordinate offset and the current compensation value of the light-emitting unit. The sum of the current compensation value and the initial current data is used as the target current data.

[0128] In one alternative embodiment, the current regulation module 803 is specifically used for: Based on the emission color of the target light-emitting unit itself, a second target correspondence is selected from multiple second correspondences. The multiple second correspondences are used to characterize the correspondence between the color coordinate offset and the current compensation value of light-emitting units with different emission colors. The number of second correspondences is consistent with the number of emission colors of the light-emitting unit. The current compensation value corresponding to the target color coordinate offset in the second target correspondence is used as the current compensation value of the target light-emitting unit.

[0129] Based on the same concept, this embodiment of the invention also provides a backlight module. Since the principle of the backlight module in solving the problem is similar to that of the aforementioned display chip, 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.

[0130] like Figure 9 As shown, the backlight module 900 provided in this embodiment of the invention includes a plurality of dimmers 901, a plurality of light-emitting units 902, and a display chip 903 as described in any of the second aspects above. The light-emitting units 902 emit various colors, including: The display chip 903 is electrically connected to a plurality of dimmers 901, and one dimmer 901 is electrically connected to at least one light-emitting unit 902. The dimmer 901 is used to: receive target current data sent by the display chip 903, and output the target operating current to the light-emitting unit 902 electrically connected to itself according to the target current data; The light-emitting unit 902 is used to emit backlight of corresponding brightness under the drive of the target operating current it receives.

[0131] In one alternative embodiment, such as Figure 9 As shown, the dimmer 901 includes a transmission module 9011, a processing module 9012, and a monitoring module 9013, wherein: The transmission module 9011 is electrically connected to the processing module 9012 and the monitoring module 9013 respectively. The monitoring module 9013 includes a temperature monitoring unit. The transmission module 9011 is used to: receive target current data sent by the display chip, and send a first temperature to the display chip; The processing module 9012 is used to: generate a target operating current based on the target current data, and transmit the target operating current to the light-emitting unit electrically connected to itself; The temperature monitoring unit is used to monitor the current temperature of the dimmer according to a preset cycle and generate a first temperature.

[0132] In one optional embodiment, the preset period is consistent with the display period corresponding to N image frames, where N is a positive integer and N≥1.

[0133] Based on the same concept, this invention also provides a display device. Since the principle of this display device in solving the problem is similar to that of the aforementioned backlight module, the implementation of this display device can refer to the implementation of the aforementioned backlight module, and the repeated parts will not be described again.

[0134] like Figure 10As shown, the display device provided in this embodiment of the invention may include a display module 1001 and a backlight module 900 as provided in any of the above embodiments, wherein: the display module 1001 is used to: display image frames according to the backlight provided by the backlight module 900.

[0135] In specific implementations, the display device in the embodiments of the present invention can be a smart terminal, a smart mobile terminal, a tablet computer, a laptop computer, a smart handheld device, a personal computer (PC), a computer, a smart screen, a display device, an in-vehicle device, various wearable devices, a personal digital assistant (PDA), etc.; among which, wearable devices include virtual reality (VR) devices, augmented reality (AR) devices, etc. Furthermore, other essential components of this display device 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 limiting the present invention.

[0136] 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.

[0137] 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: Obtain a first temperature, wherein the first temperature is used to characterize the current temperature of the dimmer; Based on the first temperature and the emission color of the target emission unit itself, the target color coordinate offset corresponding to the target emission unit is determined, wherein the target emission unit is an emission unit electrically connected to the dimmer; Based on the target color coordinate offset and the initial current data of the target light-emitting unit, the target current data is determined, and the luminous brightness of the target light-emitting unit is controlled based on the target current data.

2. The method as described in claim 1, characterized in that, The step of determining the target color coordinate offset corresponding to the target light-emitting unit based on the first temperature and the emission color of the target light-emitting unit itself includes: A second temperature is determined based on the first temperature, wherein the first temperature is determined by the temperature monitoring unit inside the dimmer, and the second temperature is used to characterize the current temperature of the target light-emitting unit; The target color coordinate offset is determined based on the second temperature and the emission color of the target light-emitting unit itself.

3. The method as described in claim 2, characterized in that, Determining the target color coordinate offset based on the second temperature and the emission color of the target emitting unit itself includes: Based on the emission color of the target light-emitting unit itself, a first target correspondence is selected from multiple first correspondences, wherein the multiple first correspondences are used to characterize the correspondence between temperature and color coordinates of light-emitting units with different emission colors, and the number of first correspondences is consistent with the number of emission colors of the light-emitting unit; Based on the correspondence between the second temperature and the first target, the target color coordinate offset is determined.

4. The method as described in claim 3, characterized in that, The step of determining the target color coordinate offset based on the correspondence between the second temperature and the first target includes: The color coordinates corresponding to the second temperature in the first target correspondence are used as the current color coordinates of the target light-emitting unit. The color coordinates corresponding to the preset reference temperature in the first target correspondence are used as the reference color coordinates corresponding to the target light-emitting unit; The difference between the current color coordinates and the reference color coordinates is used as the target color coordinate offset.

5. The method according to any one of claims 2 to 4, characterized in that, Determining the second temperature based on the first temperature includes: A third temperature is determined based on the first temperature and the first power, wherein the first power is determined based on the current operating current of the dimmer and the target channel voltage, the target channel voltage being the channel voltage in the dimmer corresponding to the target light-emitting unit, and the third temperature being used to characterize the current temperature of the substrate area carrying the dimmer; The second temperature is determined based on the third temperature and the second power, wherein the second power is used to characterize the current power of the target light-emitting unit.

6. The method as described in claim 5, characterized in that, Determining the third temperature based on the first temperature and the first power includes: The sum of the first thermal resistance and the second thermal resistance is calculated to obtain the third thermal resistance. The first thermal resistance is used to characterize the junction thermal resistance of the dimmer, and the second thermal resistance is used to characterize the thermal resistance between the package shell of the dimmer and the substrate area supporting the dimmer. Both the first thermal resistance and the second thermal resistance are determined by the first test data. The product of the third thermal resistance and the first power is calculated to obtain the fourth temperature, and the difference between the first temperature and the fourth temperature is taken as the third temperature.

7. The method as described in claim 5, characterized in that, Determining the second temperature based on the third temperature and the second power includes: The product of the fourth thermal resistance and the second power is calculated to obtain the fifth temperature, wherein the fourth thermal resistance is used to characterize the thermal resistance between the packaging shell of the target light-emitting unit and the substrate area supporting the target light-emitting unit, and the fourth thermal resistance is determined by the second test data, and the second power is determined based on the current operating current and operating voltage of the target light-emitting unit; The sum of the third temperature and the fifth temperature is taken as the second temperature.

8. The method as described in claim 7, characterized in that, The step of determining the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit includes: Based on the target color coordinate offset and the correspondence between the second target, the current compensation value of the target light-emitting unit is determined, wherein the second target correspondence is used to characterize the correspondence between the color coordinate offset of the light-emitting unit and the current compensation value; The sum of the current compensation value and the initial current data is used as the target current data.

9. The method as described in claim 8, characterized in that, The step of determining the current compensation value of the target light-emitting unit based on the target color coordinate offset and the correspondence between the target and the second target includes: Based on the emission color of the target light-emitting unit itself, the second target correspondence is selected from a plurality of second correspondences, wherein the plurality of second correspondences are respectively used to characterize the correspondence between the color coordinate offset and the current compensation value of light-emitting units with different emission colors, and the number of the second correspondences is consistent with the number of emission colors of the light-emitting unit; The current compensation value corresponding to the target color coordinate offset in the second target correspondence is used as the current compensation value of the target light-emitting unit.

10. A display chip, characterized in that, include: A temperature acquisition module is used to acquire a first temperature, wherein the first temperature is used to characterize the current temperature of the dimmer; An offset determination module is used to determine the target color coordinate offset of the target light-emitting unit based on the first temperature and the light emission color of the target light-emitting unit itself, wherein the target light-emitting unit is a light-emitting unit electrically connected to the dimmer; The current adjustment module is used to determine the target current data based on the target color coordinate offset and the initial current data of the target light-emitting unit, and to control the light emission brightness of the target light-emitting unit based on the target current data.

11. The display chip as described in claim 10, characterized in that, The display chip can be any one of a system-on-a-chip, a timing control chip, or a dimming control chip.

12. A backlight module, characterized in that, It includes multiple dimmers, multiple light-emitting units, and a display chip as described in any one of claims 10-11, wherein the multiple light-emitting units emit multiple colors, wherein: The display chip is electrically connected to the plurality of dimmers respectively, and one of the dimmers is electrically connected to at least one of the light-emitting units; The dimmer is used to: receive target current data sent by the display chip, and output a target operating current to the light-emitting unit electrically connected to itself based on the target current data; The light-emitting unit is used to emit backlight of corresponding brightness under the drive of the target operating current it receives.

13. The backlight module as described in claim 12, characterized in that, The dimmer includes a transmission module, a processing module, and a monitoring module, wherein: The transmission module is electrically connected to the processing module and the monitoring module respectively, and the monitoring module includes a temperature monitoring unit; The transmission module is used to: receive target current data sent by the display chip, and send a first temperature to the display chip; The processing module is used to: generate the target operating current based on the target current data, and transmit the target operating current to the light-emitting unit electrically connected to itself; The temperature monitoring unit is used to: monitor the current temperature of the dimmer according to a preset cycle, and generate the first temperature.

14. The backlight module as described in claim 13, characterized in that, The preset period is consistent with the display period corresponding to N image frames, where N is a positive integer and N≥1.

15. A display device, characterized in that, Includes a display module and a backlight module as described in any one of claims 12 to 14, wherein: The display module is used to display image frames based on the backlight provided by the backlight module.

Images