Display device

Abstract

The invention discloses display equipment, and relates to the technical field of display equipment, and the method comprises the steps: determining a reference backlight mean value of each color channel in three color channels according to backlight data of a target image; according to preset backlight power, weighted average processing is carried out on the reference backlight mean values of the three color channels, a target backlight mean value is obtained, and the preset backlight power is used for representing backlight power corresponding to each color channel when the display panel presents the preset image; determining a first backlight current corresponding to each color channel according to the target backlight mean value and preset mapping data; and controlling the display panel to present the target image, and driving each light-emitting chip in the light-emitting unit to emit light through the backlight driving circuit based on the first backlight current corresponding to each color channel. The problem of display color cast of the display equipment can be solved, so that the display quality of the display equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display device. Background Art

[0002] Peak brightness technology (also called peaking technology) is a technology that improves the display effect of an image by dynamically adjusting the backlight brightness of a display device.

[0003] At present, peaking technology is mainly used in display devices with a single light source (such as white light LED). In practical applications, dynamically adjusting the backlight brightness according to the average picture level (APL value) of the current input image can improve the display effect.

[0004] However, when the existing peaking technology is applied to RGB LED display devices, it will cause color cast problems and affect the display effect. Summary of the invention

[0005] The present application provides a display device and a backlight control method, which can solve the problem of display color cast of the display device, thereby improving the display quality of the display device.

[0006] In a first aspect, some embodiments of the present application provide a display device, comprising: a display panel; a backlight module, the backlight module comprising a backlight driving circuit and a plurality of light-emitting units, one light-emitting unit comprising three light-emitting chips, the three light-emitting chips corresponding to three color channels one by one, the backlight driving circuit being electrically connected to the plurality of light-emitting units, the backlight driving circuit being configured to respectively drive each light-emitting chip in each light-emitting unit to emit light; a control module, the control module being respectively connected to the display panel and the backlight driving circuit; wherein the control module is configured to:

[0007] According to the backlight data of the target image, the reference backlight mean of each color channel in the three color channels is determined; according to the preset backlight power, the reference backlight mean of the three color channels is weighted averaged to obtain the target backlight mean, and the preset backlight power is used to characterize the backlight power corresponding to each color channel when the display panel presents the preset image; according to the target backlight mean and the preset mapping data, the first backlight current corresponding to each color channel is determined, and the preset mapping data includes data characterizing the corresponding relationship between the backlight mean and the backlight current of each color channel; the display panel is controlled to present the target image, and based on the first backlight current corresponding to each color channel, each light-emitting chip in the light-emitting unit is driven to emit light through the backlight driving circuit.

[0008] In a second aspect, some embodiments of the present application further provide a display device, comprising: a display panel; a backlight module, the backlight module comprising a backlight driving circuit and a plurality of light-emitting units, one light-emitting unit comprising three light-emitting chips, the three light-emitting chips corresponding to three color channels one by one, the backlight driving circuit being electrically connected to the plurality of light-emitting units, the backlight driving circuit being configured to respectively drive each light-emitting chip in each light-emitting unit to emit light; a control module, the control module being respectively connected to the display panel and the backlight driving circuit; wherein the control module is configured to:

[0009] The display panel is controlled to present a first image, and each light-emitting chip in the light-emitting unit is driven to emit light through a backlight driving circuit based on first driving data corresponding to the first image, wherein the first image is a red test image; the display panel is controlled to present a second image, and each light-emitting chip in the light-emitting unit is driven to emit light through a backlight driving circuit based on second driving data corresponding to the second image, wherein the second image is a green test image; the display panel is controlled to present a third image, and each light-emitting chip in the light-emitting unit is driven to emit light through a backlight driving circuit based on third driving data corresponding to the third image, wherein the third image is a blue test image; wherein the sum of the first display brightness, the second display brightness and the third display brightness is greater than or equal to the reference display brightness, the first display brightness is the display brightness when the display panel displays the first image, the second display brightness is the display brightness when the display panel displays the second image, the third display brightness is the display brightness when the display panel displays the third image, and the reference display brightness is the display brightness when the display panel displays a full white field image.

[0010] In a third aspect, some embodiments of the present application also provide a backlight control method, which is applied to a display device, wherein the display device includes a display panel, a backlight module and a control module, wherein the backlight module includes a backlight driving circuit and a plurality of light-emitting units, wherein one light-emitting unit includes three light-emitting chips, and the three light-emitting chips correspond to three color channels one by one. The backlight driving circuit is electrically connected to the plurality of light-emitting units, and the backlight driving circuit is configured to drive each light-emitting chip in each light-emitting unit to emit light, respectively. The control module is respectively connected to the display panel and the backlight driving circuit; the method includes: determining the backlight data of each color channel in the three color channels according to the backlight data of the target image; A reference backlight mean; based on a preset backlight power, weighted averaging the reference backlight mean values ​​of the three color channels is performed to obtain a target backlight mean, wherein the preset backlight power is used to characterize the backlight power corresponding to each color channel when the display panel presents a preset image; based on the target backlight mean value and preset mapping data, a first backlight current corresponding to each color channel is determined, wherein the preset mapping data includes data characterizing the correspondence between the backlight mean value and the backlight current of each color channel; the display panel is controlled to present a target image, and based on the first backlight current corresponding to each color channel, each light-emitting chip in the light-emitting unit is driven to emit light through a backlight driving circuit.

[0011] In a fourth aspect, some embodiments of the present application provide a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the backlight control method described in the third aspect.

[0012] In a fifth aspect, some embodiments of the present application provide a computer program product, which includes: a computer program code, and when the computer program code runs on a display device, the display device executes the backlight control method described in the third aspect.

[0013] It can be seen from the above technical solution that when the display device displays the input target image, the control module first calculates the backlight mean of the three color channels according to the backlight data of the target image, and then uses the preset backlight power to process the backlight mean of the three color channels to obtain the processed backlight mean, and based on the target backlight mean, respectively determine the backlight driving data corresponding to the three color channels, so as to drive each light-emitting chip of each light-emitting unit to emit light according to the backlight driving data. In this way, the backlight mean of the three color channels can be unified, and then the backlight driving data of the three color channels can be determined by using the unified target backlight mean, which can avoid the difference in the backlight gain (adjustment amplitude of the backlight current) of the three channels caused by the inconsistency of the backlight mean of the three channels, avoid the display color cast of the display device, and thus improve the display quality of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a relationship curve between backlight gain and APL value of a white light LED;

[0016] Figure 2 It is the relationship curve between backlight gain and APL value in the three channels of R, G and B;

[0017] Figure 3 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0018] Figure 4 A schematic diagram of the structure of a backlight module provided in an embodiment of the present application;

[0019] Figure 5A hardware configuration block diagram of a display device provided in an embodiment of the present application;

[0020] Figure 6 A hardware configuration block diagram of another display device provided in an embodiment of the present application;

[0021] Figure 7 A schematic diagram of a flow chart of a backlight control method provided in an embodiment of the present application;

[0022] Figure 8 A schematic diagram of a curve showing a relationship between a preset APL value and a preset partition current provided in an embodiment of the present application;

[0023] Fig. 9 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0024] Fig.10 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0025] Fig.11 A schematic flow chart of another backlight control method provided in an embodiment of the present application;

[0026] Fig.12 A schematic diagram of a test image provided in some embodiments of the present application;

[0027] Fig.13 A schematic flow chart of another backlight control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0029] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0030] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0031] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0032] The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0033] In order to better understand the embodiments of the present application, the terms or concepts that may be involved in the embodiments of the present application are explained below.

[0034] 1. Color dimming technology

[0035] Color dimming technology is a dynamic backlight adjustment technology that generates backlight data based on the brightness and color information of the input image, and dynamically adjusts the backlight brightness of the display device based on the generated backlight data. In this way, color dimming technology can improve the contrast and detail performance of the picture, making the dark parts of the picture darker, thereby improving the picture quality. It can be understood that the backlight data includes the brightness data required to display the image, which is used to adjust the backlight brightness of the display device.

[0036] 2. Local dimming technology

[0037] Compared with color dimming technology, local dimming technology is a partition backlight adjustment technology. Usually, the display area of ​​a display device can be divided into multiple independent backlight partitions (also referred to as partitions). Local dimming technology generates the backlight data required for each partition based on the brightness and color information of the input image, and dynamically adjusts the backlight brightness of each partition based on these backlight data. In this way, local dimming technology can more significantly improve the contrast and dynamic range of the picture, thereby further improving the picture quality.

[0038] 3. APL value and peaking technology

[0039] The APL value (also called backlight average) refers to the average brightness level of all pixels in the input image, which reflects the overall brightness distribution of the image. For example, an image dominated by dark colors has a lower APL value, while an image dominated by bright colors has a higher APL value.

[0040] Compared with color dimming technology and local dimming technology, peaking technology is a global backlight adjustment technology based on the APL value of the image. Specifically, peaking technology performs color dimming processing on the input image to generate backlight data, then calculates the APL value of the image based on the backlight data, and dynamically adjusts the backlight brightness of the display device according to the APL value of the image. It can be understood that peaking technology can also dynamically adjust the backlight brightness of each partition based on the APL value of the image.

[0041] In practical applications, peaking technology is mainly used in display devices with a single light source (such as white light LED). Specifically, for white light LED display devices, a relationship curve between backlight gain and APL value is preset. When the display device displays an image, the APL value of the input image is calculated, and based on the relationship curve between backlight gain and APL value, the backlight gain corresponding to the APL value of the input image is determined, so as to adjust the backlight brightness of the display device according to the obtained backlight gain.

[0042] For example, Figure 1 The figure shows the relationship between the backlight gain and APL value of a white light LED. Figure 1 As shown in the figure, different APL values ​​correspond to different backlight gains. For example, when the APL value is 255 (i.e., full white field), the corresponding backlight gain is 1; when the APL value is 50, the corresponding backlight gain is 2.8, i.e., the backlight gain relative to full white field is 2.8.

[0043] The above part describes the terms or concepts involved in the embodiments of the present application. The following describes the technical solutions of the embodiments of the present application.

[0044] With the continuous advancement of display technology, users have put forward higher requirements for the uniformity of image color and brightness of display devices, which makes the application of RGB LED display devices more and more extensive. Unlike single light source display devices, the backlight brightness of the three channels of red (R), green (G), and blue (B) of RGBLED display devices can be controlled independently. However, when the peaking technology is directly applied to RGB LED display devices, the backlight brightness of each channel is usually adjusted based on the APL value of the three channels of R, G, and B, which will cause inconsistent backlight gain of the three channels of R, G, and B, resulting in color cast problems and affecting the display effect.

[0045] Specifically, for each of the three channels R, G, and B, a relationship curve between backlight gain and APL value can be set (eg Figure 2As shown). When the display device displays an image, the APL value of each channel is calculated according to the backlight data of the three channels R, G, and B, that is, APL_R, APL_G, and APL_B are obtained, and then the backlight brightness of the corresponding channel is adjusted according to the APL value of each channel. Although the relationship curves of the backlight gain and APL value of the three channels R, G, and B have the same changing trend, the backlight gain of the three channels R, G, and B is inconsistent due to the difference in APL values ​​of different channels, that is, the adjustment range of the backlight brightness of the three channels R, G, and B is different, which causes the problem of color cast.

[0046] In order to solve the above technical problems, the embodiment of the present application provides a display device and a backlight control method. When the display device displays the input target image, first, according to the backlight data of the target image, the backlight mean of the three channels of R, G, and B is calculated respectively (i.e., the reference backlight mean hereinafter), and then the backlight mean of the three channels of R, G, and B is processed by using the preset backlight power to obtain the processed backlight mean (i.e., the target backlight mean hereinafter), and based on the target backlight mean, the backlight driving data (such as backlight driving current) corresponding to the three channels of R, G, and B is determined respectively, so as to drive each light-emitting chip of each light-emitting unit to emit light according to the backlight driving data. In this way, the APL values ​​of the three color channels of R, G, and B can be unified, and then the backlight driving data of the three color channels of R, G, and B can be determined by using the unified target backlight mean, which can avoid the difference in the backlight gain (adjustment amplitude of the backlight current) of the three channels caused by the inconsistency of the APL values ​​of the three channels of RGB, and avoid the display color cast of the display device, thereby improving the display quality of the display device.

[0047] The display device and backlight control method provided in the embodiments of the present application are described below with reference to the accompanying drawings.

[0048] In the embodiments of the present application, the display device generally refers to a device with image display and data processing capabilities. For example, the display device includes but is not limited to smart TVs, mobile terminals, computers, monitors, advertising screens, wearable devices, virtual reality devices, augmented reality devices, etc.

[0049] Figure 3 This is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Figure 3 As shown, the display device includes a display panel 10 and a backlight module 20 , wherein the display panel 10 is located at the light emitting side of the backlight module 20 , and the display panel 10 is used for image display. The backlight module 20 is used for providing a backlight source to the display panel 10 .

[0050] The shape and size of the display panel 10 are generally adapted to the shape and size of the display device. For example, when applied to fields such as televisions or mobile terminals, the display panel 10 can be set to a rectangular shape, including a top side, a bottom side, a left side, and a right side, wherein the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the left side and one end of the right side, respectively, and the bottom side is connected to the other end of the left side and the other end of the right side, respectively.

[0051] The display panel 10 may be a transmissive display panel that can modulate the transmittance of light but does not emit light itself. The display panel 10 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of the light incident to the pixel unit by the backlight module 20, so that the light transmitted by all the pixel units constitutes the displayed image.

[0052] In some examples, the display panel 10 may be a liquid crystal display panel. Figure 3 As shown, the display panel 10 may include a liquid crystal layer (LC) and a color filter layer (CF). The liquid crystal layer may be composed of liquid crystal molecules placed between two conductive glasses. The electric field is applied by two electrodes to cause the arrangement of the liquid crystal molecules to be distorted, thereby adjusting the transmittance of the light emitted by the backlight source to display the image. The color filter layer is located above the liquid crystal layer. The color filter layer can filter the white light emitted by the backlight source to allow light of a specific wavelength (i.e., color) to pass through, thereby displaying a color image.

[0053] It should be noted that Figure 3 The display panel shown is only an example, and the display panel may also be of other structures, for example, the display panel may not include a filter layer. The structure of the display panel is not specifically limited in the embodiments of the present application.

[0054] The backlight module 20 is usually located at the bottom of the display device, and the shape and size of the backlight module 20 usually match the shape and size of the display panel 10. For example, when applied to fields such as televisions or mobile terminals, the backlight module 20 can be set to a rectangular shape.

[0055] The backlight module 20 may include a backlight driving circuit and a plurality of light-emitting units, wherein one light-emitting unit may include at least two light-emitting chips, and the two light-emitting chips are used to emit light of different wavelengths. The backlight driving circuit is connected to the plurality of light-emitting units, and the backlight driving circuit is used to drive each light-emitting chip in each light-emitting unit to emit light.

[0056] In some examples, one light-emitting unit includes three light-emitting chips, and the three light-emitting chips correspond one to one with the three color channels of R, G, and B. That is, one light-emitting unit includes a red light-emitting chip, a green light-emitting chip, and a blue light-emitting chip, that is, one light-emitting unit includes three light-emitting chips of R, G, and B. The backlight driving circuit is used to drive the three light-emitting chips of R, G, and B in each light-emitting unit to emit light respectively.

[0057] The backlight module is schematically described below using a specific example.

[0058] For example, Figure 4 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present application. Figure 4 As shown, the backlight module 20 includes a back plate 21 , a circuit board (ie, a backlight driving circuit) 22 and a plurality of light emitting units 23 .

[0059] The back plate 21 is located at the bottom of the backlight module 20 and has a supporting and bearing function. The back plate 21 can be a rectangular structure. It can be understood that the shape of the back plate 21 is suitable for the shape of the display device.

[0060] When the backlight module 20 is a direct-type backlight module, the circuit board 22 is disposed on the back plate 21. The circuit board 22 is used to provide a driving signal to the light-emitting unit 23. Exemplarily, the circuit board 22 can be a printed circuit board (PCB) or a flexible circuit board.

[0061] The light-emitting unit 23 is disposed on the circuit board 22 and is electrically connected to the circuit board 22. Each light-emitting unit 23 may include three light-emitting chips, namely a red light-emitting chip (i.e., an R light-emitting chip), a green light-emitting chip (i.e., a G light-emitting chip), and a blue light-emitting chip (i.e., a B light-emitting chip). It should be noted that the circuit board 22 may output a driving signal to each light-emitting chip of each light-emitting unit 23, respectively, so as to drive each light-emitting chip to emit light.

[0062] In some examples, such as Figure 4 As shown, the backlight module 20 further includes a diffuser 24. The diffuser 24 is located at the light-emitting side of the light-emitting unit 23. The diffuser 24 is used to scatter the incident light so that the light passing through the diffuser 24 is more uniform. Figure 4 As shown, the diffuser 24 is spaced a certain distance from the light emitting unit 23, so that the light between the light emitting units can be fully mixed. Exemplarily, the diffuser 24 can be a quantum dot diffuser.

[0063] In some examples, such as Figure 4As shown, the backlight module 20 further includes an optical film 25. The optical film 25 is located on a side of the diffusion plate 24 away from the light-emitting unit 23. Exemplarily, the optical film 25 may include at least one of a fluorescent film, a quantum film, a prism film, and a brightness enhancement film.

[0064] By providing the optical film 25 and the diffusion plate 24 , it is possible to improve light utilization, optimize light guiding uniformity, increase brightness and color performance, and make the brightness distribution of the entire display panel more uniform.

[0065] It should be noted that Figure 4 The backlight module shown is only an example, and the backlight module may also have other structures. The structure of the backlight module is not specifically limited in the embodiments of the present application.

[0066] The above section schematically illustrates the physical structure of the display device. The following section further illustrates the hardware structure of the display device.

[0067] For example, Figure 5 A schematic diagram of the hardware structure of a display device provided in an embodiment of the present application. Figure 5 As shown, the display device may include a display panel 10 and a backlight module 20, and the display module includes a backlight driving circuit (i.e., a circuit board) 22 and a plurality of light-emitting units 23. The display device may also include a control module 30, which is connected to the display panel 10 and the backlight driving circuit 22, respectively.

[0068] The control module 30 is used to perform operations such as format conversion, data processing, image rendering, and protocol conversion on the input target image, generate display intermediate data, and process the display intermediate data to output the processed display data to the display panel 10 .

[0069] The control module 30 is also used to perform color dimming processing on the input target image to obtain the backlight data of the target image, and determine the reference backlight mean of each color channel in the three color channels according to the backlight data of the target image, and perform weighted average processing on the reference backlight mean of the three color channels according to the preset backlight power to obtain the target backlight mean, and the preset backlight power is used to characterize the backlight power corresponding to each color channel when the display panel presents the preset image. The control module 30 is also used to determine the first backlight current corresponding to each color channel according to the target backlight mean and preset mapping data, the preset mapping data includes data characterizing the corresponding relationship between the backlight mean and the backlight current of each color channel, and send the first backlight current corresponding to each color channel to the backlight driving circuit driver 22, so that the backlight driving circuit drives each light-emitting chip in the light-emitting unit 22 to emit light.

[0070] For example, Figure 6A schematic diagram of the hardware structure of another display device provided in an embodiment of the present application. Figure 6 As shown, the control module 30 may include an active chip (i.e., SOC) 31, a timing controller (TCON) 32, a processing chip (i.e., central control) 33, and a backlight controller 34, wherein the main control chip 31 is connected to the timing controller 32, and the timing controller 32 is connected to the display panel 10. The processing chip 33 is connected to the main control chip 31 and the backlight controller 34, respectively. The backlight controller 34 is connected to the backlight driving circuit 22.

[0071] Among them, the main control chip 31 is used to perform operations such as format conversion, data processing, image rendering, and protocol conversion on the input target image to generate display intermediate data. The main control chip 31 transmits the generated display intermediate data to the timing controller 32. The timing controller 32 processes the display intermediate data and outputs the processed display data to the display panel 10. It can be understood that the display data cannot be directly processed by the display panel 10. The display data can be data that can be processed by the display panel 10.

[0072] In some examples, the timing controller 32 is configured to map the display data with the positions of the liquid crystal molecules so that the display data obtained by the display panel 10 is the data that needs to be displayed, thereby ensuring the accuracy of the display.

[0073] The main control chip 31 is also used to perform color dimming processing on the input target image to obtain backlight data of the target image, and determine the reference backlight average of each color channel in the three color channels based on the backlight data of the target image, and send the reference backlight average of each color channel to the processing chip 33.

[0074] The processing chip 33 is used to perform weighted average processing on the reference backlight mean values ​​of the three color channels according to the preset backlight power to obtain the target backlight mean value. The preset backlight power is used to characterize the backlight power corresponding to each color channel when the display panel presents the preset image. The processing chip 33 is also used to determine the first backlight current corresponding to each color channel according to the target backlight mean value and the preset mapping data. The preset mapping data includes data characterizing the corresponding relationship between the backlight mean value and the backlight current of each color channel. The processing chip 33 sends the first backlight current corresponding to each color channel to the backlight controller 34.

[0075] The backlight controller 34 is used to drive each light-emitting chip in the light-emitting unit 22 to emit light through the backlight driving circuit based on the first backlight current corresponding to each color channel.

[0076] Exemplarily, the backlight controller 34 is a backlight controller (BCON) or a dimming chip.

[0077] The backlight driving circuit 22 includes at least one driving group, and the at least one driving group is electrically connected to the control module 30. Each driving group includes at least one driving chip, and the driving chip is configured to generate a driving signal based on driving data.

[0078] It should be noted that Figure 6 The control module shown is only an example, and the control module may also be other hardware structures, for example, the processing chip is integrated into the main control chip. The structure of the backlight module is not specifically limited in the embodiment of the present application.

[0079] In addition, it should be noted that the backlight area corresponding to the backlight module can be divided into multiple backlight partitions, and one backlight partition can include one light-emitting unit or multiple light-emitting units, and each light-emitting unit can include three light-emitting chips of R, G, and B. When controlling the operation of the backlight module, each light-emitting unit in the backlight partition can be controlled to emit light for each backlight partition. When controlling each light-emitting unit in a backlight partition to emit light, the light-emitting chips of different color channels in the light-emitting unit can be controlled to emit light respectively.

[0080] The above section schematically illustrates the structure of the display device. The following describes the backlight control method provided in the embodiment of the present application.

[0081] The backlight control method provided in the embodiment of the present application, when the display device displays the input target image, firstly calculates the backlight mean values ​​of the three channels of R, G, and B (i.e., the reference backlight mean value hereinafter) according to the backlight data of the target image, and then processes the backlight mean values ​​of the three channels of R, G, and B using the preset backlight power to obtain the processed backlight mean value (i.e., the target backlight mean value hereinafter), and based on the target backlight mean value, respectively determines the backlight driving data (such as the backlight driving current) corresponding to the three channels of R, G, and B, so as to drive each light-emitting chip of each light-emitting unit to emit light according to the backlight driving data. In this way, the APL values ​​of the three color channels of R, G, and B can be unified, and then the backlight driving data of the three color channels of R, G, and B can be determined by using the unified target backlight mean value, which can avoid the differences in the backlight gain (adjustment amplitude of the backlight current) of the three channels caused by the inconsistency of the APL values ​​of the three channels of RGB, avoid the display color cast of the display device, and thus improve the display quality of the display device.

[0082] In some examples, the preset backlight power is the full white backlight power. The full white backlight power can represent the maximum output power of the display device. Therefore, the reference backlight mean of the three color channels R, G, and B is processed using the full white backlight power, and the driving data is determined based on the processed APL value. In this way, while preventing the backlight power of the display device from exceeding the maximum backlight power, the backlight brightness of the display device can be increased to a greater extent, thereby effectively improving the display effect of the color picture and the color dynamic range of the display device.

[0083] Combine the following Figure 7 , taking the control module of the display device as an execution subject as an example, the backlight control method provided in the embodiment of the present application is described in detail.

[0084] Figure 7 A flow chart of a backlight control method provided in an embodiment of the present application. Figure 7 As shown, the backlight control method may include the following steps:

[0085] S701, determining a reference backlight mean value of each of three color channels according to backlight data of a target image.

[0086] The target image refers to the image currently input to the control module of the display device, that is, the image to be displayed. The image information of the target image can be represented by the components of the three color channels R, G, and B. The above three color channels refer to the three color channels R, G, and B.

[0087] The backlight data of the target image includes brightness information of the target image, and the brightness information can be used to adjust the backlight brightness of the backlight module. In some examples, the backlight data of the target image can include a required backlight brightness value. For example, taking the example that the backlight area corresponding to the backlight module includes multiple backlight partitions, the backlight data of the target image can include the backlight brightness value required for each backlight partition.

[0088] The reference backlight mean value of a color channel (also referred to as a reference APL value) refers to the average value of the backlight brightness values ​​of all pixels in the input target image in the color channel. The reference backlight mean value of a color channel can reflect the average brightness level of the target image in the color channel. Specifically, the reference backlight mean values ​​of the three color channels may include: the reference backlight mean value of the R color channel, the reference backlight mean value of the G color channel, and the reference backlight mean value of the B color channel.

[0089] In some examples, when determining a reference backlight mean of any color channel (i.e., a target color channel), color dimming (such as color dimming or local dimming) is performed on the target image to obtain backlight data of the target image, which may include partitioned backlight data of each backlight partition, and the partitioned backlight data may include backlight data of the backlight partition in each color channel (i.e., the three color channels of R, G, and B); the backlight data of multiple backlight partitions in the target color channel are averaged to obtain a reference backlight mean of the target color channel.

[0090] In practical applications, color dimming processing is performed on the target image to obtain partition backlight data of each backlight partition, and reference backlight means of the three color channels of R, G, and B are calculated respectively according to the partition backlight data of each backlight partition.

[0091] For example, taking the R color channel as an example, the reference backlight mean value of the R color channel can be calculated according to the following formula 1.

[0092]

[0093] Among them, APL_R represents the reference backlight mean of the R color channel, BL_R(i,j) represents the backlight data of the (i,j)th backlight partition on the R color channel, M and N represent the number of rows and columns respectively, and M*N represents the number of backlight partitions.

[0094] For example, taking the G color channel as an example, the reference backlight mean value of the G color channel can be calculated according to the following formula 2.

[0095]

[0096] Among them, APL_G represents the reference backlight mean of the G color channel, BL_G(i,j) represents the backlight data of the (i,j)th backlight partition on the G color channel, M and N represent the number of rows and columns respectively, and M*N represents the number of backlight partitions.

[0097] For another example, taking the B color channel as an example, the reference backlight mean value of the B color channel can be calculated according to the following formula 3.

[0098]

[0099] Among them, APL_B represents the reference backlight mean of the B color channel, BL_B(i,j) represents the backlight data of the (i,j)th backlight partition on the B color channel, M and N represent the number of rows and columns respectively, and M*N represents the number of backlight partitions.

[0100] S702 , performing weighted averaging processing on the reference backlight mean values ​​of the three color channels according to the preset backlight power to obtain a target backlight mean value.

[0101] The preset backlight power is used to represent the backlight output power corresponding to each color channel when the display panel presents a preset image.

[0102] In practical applications, the preset image may be a full white field image, in which case the preset backlight power is the full white field backlight power. The full white field backlight power characterizes the backlight output power corresponding to each color channel when the display panel presents a full white field image. Specifically, the full white field backlight power may include the backlight power of the red channel (i.e., the R color channel), the backlight power of the green channel (i.e., the G color channel), and the backlight power of the blue channel (i.e., the B color channel). Among them, the backlight power of the R color channel is used to characterize the total backlight power corresponding to the R light-emitting chip when the display panel presents a full white field image; the backlight power of the G color channel is used to characterize the total backlight power corresponding to the G light-emitting chip when the display panel presents a full white field image; the backlight power of the B color channel is used to characterize the total backlight power corresponding to the B light-emitting chip when the display panel presents a full white field image.

[0103] It can be understood that the sum of the backlight power of the R color channel, the backlight power of the G color channel and the backlight power of the B color channel is the total backlight power of the full white field.

[0104] In this embodiment, the backlight control method may further include a step of determining a preset backlight power, wherein the process of determining the preset backlight power may refer to the relevant description below and will not be repeated here.

[0105] Of course, in some examples, the full white field backlight power (i.e., the backlight power of the R color channel, the backlight power of the G color channel, and the backlight power of the B color channel) can be determined in advance, and then, when determining the target backlight mean, the stored full white field backlight power is obtained, and the target backlight mean is determined based on the full white field backlight power.

[0106] The process of determining the target backlight mean value is described below.

[0107] In some examples, when calculating the target backlight mean using the preset backlight power, the backlight power corresponding to each color channel is used as the weight coefficient of the corresponding color channel, and the reference backlight means of the three color channels R, G, and B are weighted averaged to obtain the target backlight mean.

[0108] In the embodiment of the present application, the reference backlight mean values ​​of the three color channels R, G, and B are weighted averaged by utilizing the backlight power corresponding to each color channel, so that the APL values ​​of the three color channels R, G, and B can be unified, and then the backlight driving data of the three color channels R, G, and B can be determined by using a unified target backlight mean value. This can avoid differences in the backlight gains (adjustment amplitude of the backlight current) of the three channels caused by inconsistent APL values ​​of the three RGB channels, avoid color cast of the display device, and thus improve the display quality of the display device.

[0109] In some examples, the backlight power corresponding to each color channel when displaying a full white field image is used as the weight coefficient of the corresponding color channel, and the reference backlight means of the three color channels R, G, and B are weighted averaged to obtain the target backlight mean.

[0110] In this example, the full white field backlight power can represent the maximum output power of the display device. Therefore, the reference backlight average of the three color channels R, G, and B is processed using the full white field backlight power, and the driving data is determined based on the processed APL value. This can prevent the backlight power of the display device from exceeding the maximum backlight power while increasing the backlight brightness of the display device to a greater extent, thereby effectively improving the display effect of the color picture and the color dynamic range of the display device.

[0111] The following schematically illustrates the process of determining the target backlight mean value by taking the preset backlight power as the full white field backlight power as an example.

[0112] Exemplarily, the target backlight mean value may be calculated according to the following formula 4.

[0113]

[0114] Among them, APL ′ Represents the target backlight mean; power_r represents the backlight power of the R color channel when the display panel presents a full white field image; APL_R represents the reference backlight mean of the R color channel; powr_g represents the backlight power of the G color channel when the display panel presents a full white field image; APL_G represents the reference backlight mean of the G color channel; power_b represents the backlight power of the B color channel when the display panel presents a full white field image; APL_R represents the reference backlight mean of the B color channel; power_w represents the total backlight power of the full white field.

[0115] Exemplarily, the total backlight power (power_w) of the full white field can be calculated according to the following formula 5.

[0116] power_w=power_r+power_g+power_b (5)

[0117] Among them, power_w represents the total backlight power of the full white field; power_r represents the backlight power of the R color channel when the display panel presents a full white field image; power_g represents the backlight power of the G color channel when the display panel presents a full white field image; power_b represents the backlight power of the B color channel when the display panel presents a full white field image.

[0118] S703, determining a first backlight current corresponding to each color channel according to the target backlight mean value and preset mapping data, wherein the preset mapping data includes data representing a corresponding relationship between backlight mean values ​​of different color channels and backlight currents.

[0119] The target backlight average value refers to the unified backlight average value (i.e., APL) obtained by processing the reference backlight average values ​​of the three color channels (i.e., the above S702). ′ ).

[0120] The preset mapping data includes data that characterizes the corresponding relationship between the backlight mean and the backlight current of different color channels. Among them, the backlight mean here refers to the preset backlight mean, that is, the preset backlight mean (also referred to as the preset APL value). Correspondingly, the backlight current refers to the backlight current corresponding to each preset backlight mean, that is, the preset backlight current. In the embodiment of the present application, different preset backlight means correspond to different required display brightness (i.e., the second preset brightness), and the display brightness of the display device is different, and the backlight current output by the backlight module will also be adjusted accordingly. Therefore, in actual applications, a corresponding preset backlight current can be set for each preset backlight mean.

[0121] It should be noted that the preset backlight current can be set according to the model of the display device, various performance parameters and actual needs, and the embodiments of the present application do not specifically limit this.

[0122] In the embodiment of the present application, the light-emitting unit may include three light-emitting chips of R, G, and B, and the backlight brightness of the three light-emitting chips of R, G, and B can be driven independently. In this regard, the preset mapping data may include preset mapping data 1 (i.e., the first preset mapping data), preset mapping data 2 (i.e., the second preset mapping data), and preset mapping data 3 (i.e., the third preset mapping data). Among them, the preset mapping data 1 includes data characterizing the corresponding relationship between the preset backlight mean and the preset backlight current of the R color channel. The preset mapping data 2 includes data characterizing the corresponding relationship between the preset backlight mean and the preset backlight current of the G color channel. The preset mapping data 3 includes data characterizing the corresponding relationship between the preset backlight mean and the preset backlight current of the B color channel. It can be understood that the preset backlight current of the R color channel refers to the preset backlight current corresponding to the R light-emitting chip, the preset backlight current of the G color channel refers to the preset backlight current corresponding to the G light-emitting chip, and the preset backlight current of the B color channel refers to the preset backlight current corresponding to the B light-emitting chip.

[0123] Exemplarily, the preset mapping data may be represented by a relationship curve between a preset APL value and a preset backlight current. For example, preset mapping data 1 is represented by a relationship curve between a preset backlight mean value and a preset backlight current of an R color channel. Preset mapping data 2 is represented by a relationship curve between a preset backlight mean value and a preset backlight current of a G color channel. Preset mapping data 3 is represented by a relationship curve between a preset backlight mean value and a preset backlight current of a B color channel.

[0124] In this embodiment, for any color channel among R, G, and B, data representing the corresponding relationship between the preset backlight mean and the preset backlight current of the corresponding color channel is obtained in advance. In this way, based on the corresponding preset mapping data of each color channel (such as the aforementioned preset mapping data 1, preset mapping data 2, and preset mapping data 3), the backlight driving data corresponding to each color channel is determined respectively, thereby improving the accuracy of backlight control and enhancing the display effect.

[0125] In some examples, when the backlight module is driven according to the backlight partition, the backlight driving data of each light-emitting unit in a backlight partition is usually consistent. Therefore, the preset mapping data may include data characterizing the corresponding relationship between the preset backlight mean and the partition current (preset partition current).

[0126] That is, the preset mapping data 1 includes data characterizing the corresponding relationship between the preset backlight mean value and the preset partition current of the R color channel. The preset mapping data 2 includes data characterizing the corresponding relationship between the preset backlight mean value and the preset partition current of the G color channel. The preset mapping data 3 includes data characterizing the corresponding relationship between the preset backlight mean value and the preset partition current of the B color channel.

[0127] It should be noted that different preset backlight mean values ​​correspond to different required display brightness (i.e., required display brightness), and the display brightness of the display device is different, and the partition current of each backlight partition will also be adjusted accordingly. Therefore, in practical applications, a corresponding preset partition current can be set for each backlight partition for each preset backlight mean value. In addition, the preset partition current here can refer to the preset partition current of a specified backlight partition among multiple backlight partitions. The preset partition current of a specified backlight partition can be used as a reference to adjust the backlight current of other backlight partitions.

[0128] In addition, it should be noted that the preset partition current can be set according to the model of the display device, various performance parameters and actual needs, and the embodiments of the present application do not specifically limit this.

[0129] In this embodiment, for any color channel among R, G, and B, data representing the corresponding relationship between the preset backlight mean and the preset partition current of the corresponding color channel is obtained in advance. In this way, when adjusting the backlight brightness, for each backlight partition, based on the corresponding preset mapping data of each color channel (such as the aforementioned preset mapping data 1, preset mapping data 2, and preset mapping data 3), the backlight driving data corresponding to each color channel is determined respectively, thereby further improving the accuracy of backlight control and enhancing the display effect.

[0130] Exemplarily, the preset mapping data can be represented by a relationship curve between the preset APL value and the preset partition current. Figure 8 As shown, the preset mapping data 1 is represented by a relationship curve between the preset backlight mean value and the preset partition current of the R color channel (i.e., curve 1). The preset mapping data 2 is represented by a relationship curve between the preset backlight mean value and the preset partition current of the G color channel (i.e., curve 2). The preset mapping data 3 is represented by a relationship curve between the preset backlight mean value and the preset partition current of the B color channel (i.e., curve 3).

[0131] It should be noted that if Figure 8 As shown, although the preset partition currents corresponding to different color channels under different preset APL values ​​are different, the changing trends (backlight gains) of the backlight currents (ie, partition currents) of different color channels are consistent with the changes in the APL values.

[0132] Of course, the preset partition current here may be a preset partition current of a designated backlight partition in a corresponding color channel (such as an R color channel, a G color channel, or a B color channel).

[0133] In this embodiment, the backlight control method may further include a step of obtaining preset mapping data. The process of obtaining the preset mapping data may refer to the relevant description below and will not be repeated here.

[0134] The first backlight current corresponding to a color channel refers to the target backlight current corresponding to the color channel under the APL value (ie, target backlight mean) corresponding to the currently input target image, that is, the backlight current to which the light-emitting chip of the color channel is to be adjusted under the target backlight mean.

[0135] In some examples, taking any one of the three color channels R, G, and B (i.e., the target color channel) as an example, when determining the first backlight current corresponding to the target color channel, the first partition current corresponding to the target backlight mean is determined according to the target mapping data, and the first partition current corresponding to the target backlight mean is used as the first backlight current corresponding to the target color channel.

[0136] Specifically, taking the target color channel as the R color channel and the target mapping data as the relationship curve between the preset backlight mean and the preset partition current of the R color channel as an example, based on the relationship curve between the preset backlight mean and the preset partition current of the R color channel (such as Figure 8 As shown in the curve 1), a preset partition current 1 corresponding to the target backlight average is determined, and the preset partition current 1 is used as the first backlight current corresponding to the R color channel.

[0137] Taking the target color channel as the G color channel and the target mapping data as the relationship curve between the preset backlight mean value and the preset partition current of the G color channel as an example, based on the relationship curve between the preset backlight mean value and the preset partition current of the G color channel (such as Figure 8 2), determine the preset partition current 2 corresponding to the target backlight average value, and use the preset partition current 2 as the first backlight current corresponding to the G color channel.

[0138] Taking the target color channel as the B color channel and the target mapping data as the relationship curve between the preset backlight mean value and the preset partition current of the B color channel as an example, based on the relationship curve between the preset backlight mean value and the preset partition current of the B color channel (such as Figure 8 3), determine the preset partition current 3 corresponding to the target backlight average value, and use the preset partition current 3 as the first backlight current corresponding to the G color channel.

[0139] S704, controlling the display panel to present a target image, and based on the first backlight current corresponding to each color channel, driving each light-emitting chip in the light-emitting unit to emit light through the backlight driving circuit.

[0140] Specifically, while controlling the display panel to present the target image, the backlight driving circuit drives the light-emitting chips of the corresponding color channels in each light-emitting unit to emit light based on the first backlight current corresponding to each color channel.

[0141] Taking any color channel (ie, target color channel) among the three color channels R, G, and B as an example, the process of driving the light-emitting chip of the target color channel in each light-emitting unit to emit light based on the first backlight current corresponding to the target color channel is described.

[0142] In an embodiment of the present application, the target mapping data refers to data on the correspondence between a preset APL value and a preset partition current of a target color channel, wherein a preset partition current corresponding to a preset APL value refers to the partition current required for a specified backlight partition in the target color channel under the preset APL value.

[0143] Exemplarily, when acquiring the target mapping data, the specified backlight partition presents the white window area (i.e., white image) in the test image. The first backlight current corresponding to the target color channel is determined according to the target mapping data, that is, the first backlight current corresponding to the target color channel refers to the backlight current to be output by the backlight module when a white image is presented and the APL value is the target APL value. However, when the display device presents the target image, part of the image area presented by each backlight partition may not be a white image. Therefore, after determining the first backlight current corresponding to the target color channel, the second backlight current corresponding to each backlight partition can be determined according to the first backlight current corresponding to the target color channel and the partition backlight data of each backlight partition, and then based on the second backlight current corresponding to each backlight partition, the target light-emitting chip of each light-emitting unit in each backlight partition is driven to emit light, wherein the target light-emitting chip is the light-emitting chip corresponding to the target color channel in the light-emitting unit.

[0144] Of course, based on the second backlight current corresponding to each backlight partition, the target light-emitting chip of each light-emitting unit in each backlight partition is driven to emit light, which can be understood as driving the light-emitting chips of the three color channels of R, G, and B to emit light through the backlight driving circuit. Specifically, after determining the first backlight current corresponding to each of the three color channels of R, G, and B, the backlight current 1 of each backlight partition in the R color channel is determined according to the first backlight current corresponding to the R color channel and the partition backlight data of each backlight partition, and then based on the backlight current 1 of each backlight partition in the R color channel, the R light-emitting chip of the light-emitting unit in each backlight partition is driven to emit light.

[0145] Similarly, based on the first backlight current corresponding to the G color channel and the partition backlight data of each backlight partition, the backlight current 2 of each backlight partition in the G color channel is determined, and then based on the backlight current 2 of each backlight partition in the G color channel, the G light-emitting chips of the light-emitting units in each backlight partition are driven to emit light.

[0146] Similarly, based on the first backlight current corresponding to the B color channel and the partition backlight data of each backlight partition, the backlight current 3 of each backlight partition in the B color channel is determined, and then based on the backlight current 3 of each backlight partition in the B color channel, the B light-emitting chip of the light-emitting unit in each backlight partition is driven to emit light.

[0147] For example, Fig. 9 As shown, taking any backlight partition (the first backlight partition) among the multiple backlight partitions as an example, the process of driving the target light-emitting chip (the light-emitting chip of any color channel of R, G, and B) of each light-emitting unit in the backlight partition to emit light includes the following steps:

[0148] S901, determining adjustment parameters corresponding to the first backlight partition according to preset backlight data and partition backlight data corresponding to the first backlight partition, wherein the preset backlight data is used to represent backlight data corresponding to the preset backlight partition among multiple backlight partitions when presenting a first test image.

[0149] The first test image may be a test image when the preset APL value is the target backlight mean value. As described below with respect to the test image, the central area of ​​the first test image is the white window area, and accordingly, the preset backlight partition is the backlight partition corresponding to the white window area of ​​the first test image.

[0150] Exemplarily, the preset backlight data may be represented by a grayscale value of the white window area, that is, the preset backlight data is 255.

[0151] The subarea backlight data corresponding to the first backlight subarea may represent the backlight brightness information of the image area presented by the first backlight subarea.

[0152] S902 , processing a first backlight current corresponding to a target color channel according to an adjustment parameter corresponding to the first backlight partition to obtain a second backlight current corresponding to the first backlight partition.

[0153] Specifically, the second backlight current corresponding to the first backlight subarea can be calculated according to the following formula 6.

[0154]

[0155] Among them, I 2 Indicates the second backlight current corresponding to the first backlight partition, I 1 Indicates the first backlight current corresponding to the target color channel, BL 1 Indicates the partition backlight data corresponding to the first backlight partition, BL 0 Indicates preset backlight data.

[0156] For example, taking the backlight data corresponding to the first backlight partition as 20, the preset backlight data as 255, and the first backlight current as 20 mA, according to Formula 6, the second backlight current corresponding to the first backlight partition is 20 / 255*20 mA.

[0157] S903, outputting a second backlight current to the target light-emitting chip of the light-emitting unit in the first backlight partition through the backlight driving circuit, so as to drive the target light-emitting chip of the light-emitting unit in the first backlight partition to emit light.

[0158] Specifically, the second backlight current is controlled to be output to the target light-emitting chip of each light-emitting unit in the first backlight subarea.

[0159] Of course, the light-emitting chips of the three color channels R, G, and B can all be driven according to the above steps S901-S903, which will not be repeated here.

[0160] In this embodiment, the second backlight current corresponding to each backlight partition is determined according to the first backlight current corresponding to the target color channel and the partition backlight data of each backlight partition, and then based on the second backlight current corresponding to each backlight partition, the target light-emitting chip of each light-emitting unit in each backlight partition is driven to emit light, which can further improve the accuracy of backlight control and enhance the display effect.

[0161] The above section is an explanation of the overall process of the backlight control method provided by the embodiment of the present application. The following is a schematic explanation of the process of determining the preset backlight power and the process of obtaining the preset mapping data.

[0162] 1. Determination process of preset backlight power

[0163] Exemplarily, taking the preset backlight power as the full white field backlight power as an example, the process of determining the preset backlight power is schematically described.

[0164] like Fig.10 As shown, in the backlight control method, the process of determining the full white field backlight power may include the following steps:

[0165] S1001, the display device displays a full white field image.

[0166] Specifically, the display device displays the full white field image according to the color coordinates of the full white field and the first preset brightness. The first preset brightness is used to characterize the display brightness (i.e., screen brightness) that the display device needs to achieve when displaying the full white field image. That is, when the display device displays the full white field image, the current display brightness of the display device is obtained, the current display brightness is compared with the first preset brightness, and the current display brightness of the display device is adjusted to the first preset brightness. It should be noted that the entire screen of the display device is controlled to display the full white field image.

[0167] Among them, when judging whether the current display brightness of the display device reaches the first preset brightness, the display brightness at different positions on the screen of the display device can be detected, and the average value of the display brightness at different positions on the screen is taken as the current display brightness, and the current display brightness is compared with the first preset brightness to determine whether the current display brightness reaches the first preset brightness.

[0168] It should be noted that the first preset brightness can be set according to parameters such as the product model and performance indicators of the display device, and the embodiment of the present application does not specifically limit this.

[0169] S1002, when displaying a full white field image, obtaining current backlight driving data of each backlight partition, and determining backlight power of three color channels R, G, and B according to the current backlight driving data of each backlight partition.

[0170] In the embodiment of the present application, a backlight partition may include one or more light-emitting units, each of which includes a red (R) light-emitting chip, a green (G) light-emitting chip, and a blue (B) light-emitting chip. The current backlight driving data of a backlight partition includes the current backlight driving data of each light-emitting unit located in the backlight partition, and the current backlight driving data of a light-emitting unit includes the current backlight voltage and current backlight current corresponding to the three light-emitting chips R, G, and B.

[0171] Based on this, when calculating the backlight power of any color channel, for each backlight partition, first calculate the backlight power of all light-emitting chips of the color channel in the backlight partition, then sum the backlight power of all light-emitting chips of the color channel to obtain the backlight power of the backlight partition in the color channel. Then, sum the backlight power of all backlight partitions in the color channel to obtain the backlight power of the color channel, that is, the backlight power of the color channel under full white field.

[0172] For example, taking the backlight power of the R color channel as an example, for each backlight partition, the backlight power of each R light-emitting chip in the backlight partition is calculated according to the current backlight voltage and current backlight current corresponding to the R light-emitting chip, and the backlight power of all R light-emitting chips in the backlight partition is summed to obtain the backlight power of the backlight partition in the R color channel. Then, the backlight power of all backlight partitions in the R color channel is summed to obtain the backlight power of the R color channel, that is, the backlight power of the R color channel under full white field (which can be recorded as power_r).

[0173] Similarly, taking the backlight power of the G color channel as an example, for each backlight partition, the backlight power of each G light-emitting chip in the backlight partition is calculated according to the current backlight voltage and current backlight current corresponding to the G light-emitting chip, and the backlight power of all G light-emitting chips in the backlight partition is summed to obtain the backlight power of the backlight partition in the G color channel. Furthermore, the backlight power of all backlight partitions in the G color channel is summed to obtain the backlight power of the G color channel, that is, the backlight power of the G color channel under full white field (which can be recorded as power_g).

[0174] Similarly, taking the backlight power of the B color channel as an example, for each backlight partition, the backlight power of each B light-emitting chip in the backlight partition is calculated according to the current backlight voltage and current backlight current corresponding to the B light-emitting chip, and the backlight power of all B light-emitting chips in the backlight partition is summed to obtain the backlight power of the backlight partition in the B color channel. Furthermore, the backlight power of all backlight partitions in the B color channel is summed to obtain the backlight power of the B color channel, that is, the backlight power of the B color channel under full white field (which can be recorded as pwer_b).

[0175] Of course, after obtaining the backlight power of the R color channel, the backlight power of the G color channel, and the backlight power of the B color channel, the three can be summed to obtain the total backlight power of the full white field (which can be recorded as power_w).

[0176] 2. The process of obtaining preset mapping data

[0177] In some examples, taking the case where the preset mapping data is represented by a relationship curve between a preset APL value and a preset backlight current as an example, when obtaining the preset mapping data (i.e., target mapping data) corresponding to any color channel (i.e., target color channel), multiple preset APL values ​​are selected. For each preset APL value, the preset backlight current of the target color channel under the preset APL value is set. According to the multiple preset APL values ​​and the preset backlight current of the target color channel under each of the preset APL values, a relationship curve between the preset APL value and the preset backlight current of the target color channel is obtained, that is, the target mapping data is obtained.

[0178] In other examples, taking the case where the preset mapping data can be represented by a relationship curve between a preset APL value and a preset partition current, when obtaining the preset mapping data (i.e., target mapping data) corresponding to any color channel (i.e., target color channel), multiple preset APL values ​​are selected. For each preset APL value, the preset partition current of the target color channel under the preset APL value is set. According to the multiple preset APL values ​​and the preset partition current of the target color channel under each preset APL value, a relationship curve between the preset APL value and the preset partition current of the target color channel is obtained, that is, the target mapping data is obtained.

[0179] For example, Fig.11 As shown, the process of acquiring target mapping data may include the following steps:

[0180] S1101, controlling the display panel to present a test image.

[0181] Different test images correspond to different preset APL values. In some examples, preset APL values ​​of different sizes can be represented by test images with white windows of different areas.

[0182] For example, Fig.12 A schematic diagram of a test image provided in an embodiment of the present application. Fig.12 As shown, the test image may include a first image area located in the center and a second image area surrounding the first image area, wherein the grayscale value of the first image area is 255, that is, the first image area is a white window area, and the grayscale value of the second image area is 0, that is, the second image area is a black area. The proportion of the first image area (i.e., the white window area) in the entire test image (i.e., the area size of the first image area) is positively correlated with the size of the preset APL value. The larger the proportion of the white window area, the larger the corresponding preset APL value; the smaller the proportion of the white window area, the smaller the corresponding preset APL value.

[0183] As mentioned above, different preset APL values ​​correspond to different required display brightness (i.e., the second preset brightness). In this regard, in a specific implementation, the display device displays a test image (i.e., a test image corresponding to a preset APL value), and controls the display brightness of the display device to be the second preset brightness corresponding to the preset APL value by adjusting the output current of the backlight module.

[0184] S1102, when the display panel presents a test image, obtain the partition current (i.e., the second partition current) of the specified backlight partition (i.e., the second backlight partition) in the target color channel, and use the second partition current as the preset partition current of the target color channel under the preset APL value corresponding to the test image.

[0185] The designated backlight partition is a backlight partition corresponding to the first image area of ​​the test image among the multiple backlight partitions. Exemplarily, taking the first image area as the central image area of ​​the test image as an example, the designated backlight partition is a central backlight partition among the multiple backlight partitions. In other words, the designated partition current of the backlight partition in the target color channel can characterize the partition current of the backlight partition where the partial white image area is located in the target color channel.

[0186] S1103 , generating a relationship curve between the preset APL value and the preset partition current of the target color channel according to the plurality of preset APL values ​​and the preset partition current of the target color channel at each preset APL value.

[0187] For example, taking the R color channel as an example, the process of determining the relationship curve between the preset APL value and the preset partition backlight current of the R color channel is described.

[0188] Specifically, the display device displays a series of test images, and each test image corresponds to a preset APL value. When the display device displays a test image (i.e., a test image corresponding to a preset APL value), the display brightness of the display device is controlled to reach a second preset brightness corresponding to the preset APL value by adjusting the output current of the backlight module. At this time, the backlight current of the R light-emitting chip of the center backlight partition (i.e., the specified backlight partition) is obtained, and the obtained backlight current of the R light-emitting chip is used as the preset partition current of the R color channel under the preset APL value. According to multiple preset APL values ​​and the preset partition current of the R color channel under each preset APL value, a relationship curve between the preset APL value and the preset partition current of the R color channel can be generated. Among them, the relationship curve between the preset APL value and the preset partition current of the R color channel can be as follows Figure 8 Curve 1 in .

[0189] For example, taking the G color channel as an example, the process of determining the relationship curve between the preset APL value and the preset partition backlight current of the G color channel is described.

[0190] Specifically, the display device displays a series of test images, and each test image corresponds to a preset APL value. When the display device displays a test image (i.e., a test image corresponding to a preset APL value), the display brightness of the display device is controlled to reach a second preset brightness corresponding to the preset APL value by adjusting the output current of the backlight module. At this time, the backlight current of the G light-emitting chip of the center backlight partition (i.e., the specified backlight partition) is obtained, and the obtained backlight current of the G light-emitting chip is used as the preset partition current of the G color channel under the preset APL value. According to multiple preset APL values ​​and the preset partition current of the G color channel under each preset APL value, a relationship curve between the preset APL value and the preset partition current of the G color channel can be generated. Among them, the relationship curve between the preset APL value and the preset partition current of the G color channel can be as follows Figure 8 Curve 2 in .

[0191] For another example, taking the B color channel as an example, the process of determining the relationship curve between the preset APL value and the preset partition backlight current of the B color channel is described.

[0192] Specifically, the display device displays a series of test images, and each test image corresponds to a preset APL value. When the display device displays a test image (i.e., a test image corresponding to a preset APL value), the display brightness of the display device is controlled to reach a second preset brightness corresponding to the preset APL value by adjusting the output current of the backlight module. At this time, the backlight current of the B light-emitting chip of the center backlight partition (i.e., the specified backlight partition) is obtained, and the obtained backlight current of the B light-emitting chip is used as the preset partition current of the B color channel under the preset APL value. According to multiple preset APL values ​​and the preset partition current of the B color channel under each preset APL value, a relationship curve between the preset APL value and the preset partition current of the B color channel can be generated. Among them, the relationship curve between the preset APL value and the preset partition current of the B color channel can be as follows Figure 8 Curve 3 in .

[0193] The present application also provides a backlight control method. Fig.13 As shown, the method comprises the following steps:

[0194] S1301, controlling the display panel to present a first image, and driving each light-emitting chip in the light-emitting unit to emit light based on first driving data corresponding to the first image through a backlight driving circuit, wherein the first image is a red test image.

[0195] Exemplarily, the first driving data corresponding to the first image may be determined according to the backlight control method provided in the aforementioned embodiment.

[0196] Specifically, according to the backlight data of the first image, the reference backlight mean of each color channel in the three color channels is determined; according to the preset backlight power, the reference backlight mean of the three color channels is weighted averaged to obtain the target backlight mean; according to the target backlight mean and the preset mapping data, the first backlight current corresponding to each color channel is determined to obtain the first driving data; the preset mapping data includes data characterizing the corresponding relationship between the backlight mean and the backlight current of each color channel.

[0197] S1302, controlling the display panel to present a second image, and driving each light-emitting chip in the light-emitting unit to emit light based on second driving data corresponding to the second image through the backlight driving circuit, wherein the second image is a green test image.

[0198] Exemplarily, the second driving data corresponding to the second image may be determined according to the backlight control method provided in the aforementioned embodiment.

[0199] Specifically, according to the backlight data of the second image, the reference backlight mean of each color channel in the three color channels is determined; according to the preset backlight power, the reference backlight mean of the three color channels is weighted averaged to obtain the target backlight mean; according to the target backlight mean and the preset mapping data, the first backlight current corresponding to each color channel is determined to obtain the second driving data; the preset mapping data includes data characterizing the corresponding relationship between the backlight mean and the backlight current of each color channel.

[0200] S1303, control the display panel to present a third image, and drive each light-emitting chip in the light-emitting unit to emit light based on the third driving data corresponding to the third image through the backlight driving circuit, wherein the third image is a blue test image. The sum of the first display brightness, the second display brightness and the third display brightness is greater than or equal to the reference display brightness, the first display brightness is the display brightness when the display panel displays the first image, the second display brightness is the display brightness when the display panel displays the second image, the third display brightness is the display brightness when the display panel displays the third image, and the reference display brightness is the display brightness when the display panel displays a full white field image.

[0201] Exemplarily, the third driving data corresponding to the third image may be determined according to the backlight control method provided in the aforementioned embodiment.

[0202] Specifically, according to the backlight data of the third image, the reference backlight mean of each color channel in the three color channels is determined; according to the preset backlight power, the reference backlight mean of the three color channels is weighted averaged to obtain the target backlight mean; according to the target backlight mean and the preset mapping data, the first backlight current corresponding to each color channel is determined to obtain the third driving data; the preset mapping data includes data characterizing the corresponding relationship between the backlight mean and the backlight current of each color channel.

[0203] Optionally, the first display brightness, the second display brightness, the third display brightness and the reference display brightness satisfy the following formula 7.

[0204] L R +L G +L B ≥ 1.1 L W (7)

[0205] Among them, L R is the first display brightness; L G is the second display brightness; L B The third display brightness; L W Display brightness for reference.

[0206] From the above formula 7, it can be seen that the sum of the first display brightness, the second display brightness and the third display brightness is greater than the reference display brightness of the full white field, that is, the reference backlight mean of the three color channels of R, G, and B is processed using the full white field backlight power, and the driving data is determined based on the processed APL value. In this way, while preventing the backlight power of the display device from exceeding the maximum backlight power, the backlight brightness of the display device can be increased to a greater extent, thereby effectively improving the display effect of the color picture and the color dynamic range of the display device.

[0207] In an embodiment of the present application, when the display device is controlled to display a first image, the first display brightness can be obtained, when the display device is controlled to display a second image, the second display brightness can be obtained, and when the display device is controlled to display a third image, the third display brightness can be obtained. In this way, by comparing the sum of the first display brightness, the second display brightness, and the third display brightness with the reference display brightness, it can be determined whether the backlight control method provided in the above embodiment is used to drive the backlight module to work, thereby playing an authentication role.

[0208] The embodiment of the present disclosure provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the above-mentioned Bluetooth connection method is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. Among them, the computer-readable storage medium can be a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0209] The present disclosure provides a computer program product, which includes a computer program. When the computer program is run on a computer, the computer implements the above-mentioned backlight control method.

[0210] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above discussion in some embodiments is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

[0211] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0212] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0213] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0214] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0215] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic; for example, the division of units is only a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0216] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0217] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0218] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display device, characterized in that: include: Display panel; A backlight module, wherein the backlight module comprises a backlight driving circuit and a plurality of light-emitting units, wherein one of the light-emitting units comprises three light-emitting chips, and the three light-emitting chips correspond to three color channels one by one, and the backlight driving circuit is electrically connected to the plurality of light-emitting units, and the backlight driving circuit is configured to drive each light-emitting chip in each light-emitting unit to emit light; A control module, wherein the control module is connected to the display panel and the backlight driving circuit respectively; Wherein, the control module is configured as follows: Determining a reference backlight mean value of each of the three color channels according to the backlight data of the target image; According to a preset backlight power, a weighted average processing is performed on the reference backlight mean values ​​of the three color channels to obtain a target backlight mean value, wherein the preset backlight power is used to characterize the backlight power corresponding to each color channel when the display panel presents a preset image; Determine a first backlight current corresponding to each color channel according to the target backlight mean value and preset mapping data, wherein the preset mapping data includes data characterizing a corresponding relationship between the backlight mean value and the backlight current of each color channel; The display panel is controlled to present the target image, and based on the first backlight current corresponding to each color channel, each light-emitting chip in the light-emitting unit is driven to emit light through the backlight driving circuit.

2. The display device according to claim 1, characterized in that When the control module performs weighted averaging processing on the reference backlight mean values ​​of the three color channels according to the preset backlight power to obtain the target backlight mean value, the control module is specifically configured as follows: The backlight power corresponding to each color channel is respectively used as the weight coefficient of the corresponding color channel, and the reference backlight mean values ​​of the three color channels are weighted averaged to obtain the target backlight mean value.

3. The display device according to claim 2, characterized in that The three color channels include a red channel, a green channel and a blue channel; The preset image is a full white field image, and the preset backlight power includes the backlight power of the red channel, the backlight power of the green channel, and the backlight power of the blue channel; Among them, the backlight power of the red channel is used to characterize the backlight power corresponding to the light-emitting chip of the red channel when the display panel presents the full white field image, the backlight power of the green channel is used to characterize the backlight power corresponding to the light-emitting chip of the green channel when the display panel presents the full white field image, and the backlight power of the blue channel is used to characterize the backlight power corresponding to the light-emitting chip of the blue channel when the display panel presents the full white field image.

4. The display device according to claim 1, characterized in that The backlight module corresponds to a plurality of backlight partitions, the backlight data of the target image includes partition backlight data of each of the backlight partitions, and the control module controls the display panel to present the target image, and based on the first backlight current corresponding to each color channel, drives each light-emitting chip in the light-emitting unit to emit light through the backlight driving circuit, and is specifically configured as follows: Determine a second backlight current corresponding to each of the backlight partitions according to a first backlight current corresponding to a target color channel and partition backlight data of each of the backlight partitions, wherein the target color channel is any one of the three color channels; The backlight driving circuit is used to drive the target light-emitting chip of each light-emitting unit in each backlight partition to emit light based on the second backlight current corresponding to each backlight partition, wherein the target light-emitting chip corresponds to the target color channel.

5. The display device according to claim 4, characterized in that When the control module drives the target light-emitting chip of each light-emitting unit in each backlight partition to emit light based on the second backlight current corresponding to each backlight partition through the backlight driving circuit, the control module is specifically configured as follows: Determining an adjustment parameter corresponding to the first backlight partition according to preset backlight data and partition backlight data corresponding to the first backlight partition, wherein the preset backlight data is used to represent backlight data corresponding to the preset backlight partition among the multiple backlight partitions when presenting a first test image, and the first backlight partition is any one of the multiple backlight partitions; Processing a first backlight current corresponding to the target color channel according to an adjustment parameter corresponding to the first backlight partition to obtain a second backlight current corresponding to the first backlight partition; The second backlight current is output to the target light-emitting chip of the light-emitting unit in the first backlight partition through the backlight driving circuit to drive the target light-emitting chip of the light-emitting unit in the first backlight partition to emit light.

6. The display device according to claim 1, characterized in that The three color channels include a red channel, a green channel and a blue channel; the preset mapping data include first preset mapping data, second preset mapping data and third preset mapping data, wherein the first preset mapping data is data characterizing the correspondence between the backlight mean and the partition current corresponding to the red channel, the second preset mapping data is data characterizing the correspondence between the backlight mean and the partition current corresponding to the green channel, and the third preset mapping data is data characterizing the correspondence between the backlight mean and the partition current corresponding to the blue channel.

7. The display device according to claim 1, characterized in that When the control module determines the first backlight current corresponding to each color channel according to the target backlight mean value and the preset mapping data, the control module is specifically configured as follows: According to the target mapping data, the first partition current corresponding to the target backlight mean is determined, and the first partition current corresponding to the target backlight mean is used as the first backlight current corresponding to the target color channel. The target mapping data represents the correspondence between the backlight mean and the partition current corresponding to the target color channel, and the target color channel is any one of the three color channels.

8. The display device according to claim 1, characterized in that The preset mapping data includes target mapping data, wherein the target mapping data represents the corresponding relationship between the backlight mean value and the partition current corresponding to the target color channel, and the target color channel is any one of the three color channels; the control module is further configured to: Select multiple preset backlight averages; For each of the preset backlight average values, determining a partition current corresponding to a target color channel under the preset backlight average value; The target mapping data is obtained according to the multiple preset backlight averages and the partition current corresponding to the target color channel under each of the preset backlight averages.

9. The display device according to claim 8, characterized in that The backlight module corresponds to a plurality of backlight partitions, and when the control module determines the partition current corresponding to the target color channel under the preset backlight mean value for each preset backlight mean value, the control module is specifically configured as follows: Controlling the display panel to present a test image, wherein the test image includes a first image area located at the center and a second image area surrounding the first image area, the grayscale value of the first image area is 255, and the grayscale value of the second image area is 0; and the proportion of the first image area in the test image is positively correlated with a preset backlight mean value corresponding to the test image; When the display panel presents the test image, a second partition current of the second backlight partition in the target color channel is obtained, and the second partition current is used as the partition current of the target color channel under the preset backlight mean corresponding to the test image, wherein the second backlight partition is a backlight partition among the multiple backlight partitions corresponding to the first image area.

10. A display device, characterized in that: include: Display panel; A backlight module, wherein the backlight module comprises a backlight driving circuit and a plurality of light-emitting units, wherein one of the light-emitting units comprises three light-emitting chips, and the three light-emitting chips correspond to three color channels one by one, and the backlight driving circuit is electrically connected to the plurality of light-emitting units, and the backlight driving circuit is configured to drive each light-emitting chip in each light-emitting unit to emit light; A control module, wherein the control module is connected to the display panel and the backlight driving circuit respectively; Wherein, the control module is configured as follows: Controlling the display panel to present a first image, and driving each light-emitting chip in the light-emitting unit to emit light based on first driving data corresponding to the first image through the backlight driving circuit, wherein the first image is a red test image; Controlling the display panel to present a second image, and driving each light-emitting chip in the light-emitting unit to emit light based on second driving data corresponding to the second image through the backlight driving circuit, wherein the second image is a green test image; Controlling the display panel to present a third image, and driving each light-emitting chip in the light-emitting unit to emit light based on third driving data corresponding to the third image through the backlight driving circuit, wherein the third image is a blue test image; Among them, the sum of the first display brightness, the second display brightness and the third display brightness is greater than or equal to the reference display brightness, the first display brightness is the display brightness when the display panel displays the first image, the second display brightness is the display brightness when the display panel displays the second image, the third display brightness is the display brightness when the display panel displays the third image, and the reference display brightness is the display brightness when the display panel displays a full white field image.

Images