Display apparatus, control method thereof, computer readable storage medium, and program product

Abstract

The invention relates to a display device, a control method of the display device, a computer readable storage medium and a program product. The display device comprises a display panel, a backlight module and a controller, and the controller determines a target average image level based on the average image level of each light-emitting channel after obtaining the average image level of each light-emitting channel in the backlight module. And determining the average image level of the to-be-adjusted light-emitting channel of which the average image level is greater than a preset lower limit value as a target average image level. Therefore, the average image level of the light-emitting channel to be adjusted can be unified into the target average image level, the problem of display color cast caused by the average image level of the light-emitting channel is solved, and the display effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display device and a control method for the display device, a computer-readable storage medium, and a program product. Background Art

[0002] With the development of electronic technology, various display devices have emerged. Display devices refer to devices with image output functions, including televisions, tablets, etc., which are widely used in various scenarios such as home, school, and business.

[0003] In a display device, a plurality of light-emitting chips may be provided, and the plurality of light-emitting chips form different light-emitting channels for emitting light of different colors to display a plurality of colors.

[0004] Traditional display devices determine the brightness of a light channel based on the average image level of the light channel. However, the average image levels of different light channels cannot be completely consistent, which leads to inconsistent gains of the light channels, resulting in display color cast problems. Therefore, traditional display devices have poor display effects. Summary of the invention

[0005] Based on this, it is necessary to provide a display device capable of improving the display effect, a control method for the display device, a computer-readable storage medium and a program product in order to address the technical problem that the traditional display device has poor display effect.

[0006] In a first aspect, the present application provides a display device, the display device comprising:

[0007] A display panel, used for displaying images;

[0008] A backlight module, used to provide a light source for the display panel; the backlight module includes at least two light-emitting chips emitting light of different wavelengths;

[0009] A controller is electrically connected to the display panel and the backlight module, and the controller is configured as follows:

[0010] Obtaining an average image level of each light-emitting channel in the backlight module; the light-emitting channel includes one or more light-emitting chips emitting light of the same wavelength;

[0011] Determining a target average image level based on the average image levels of each light emitting channel;

[0012] The average image level of the light-emitting channel to be adjusted is determined as the target average image level; the light-emitting channel to be adjusted is a light-emitting channel whose average image level is greater than a preset lower limit value.

[0013] The above-mentioned display device includes a display panel, a backlight module and a controller. The backlight module includes at least two light-emitting chips that emit light of different wavelengths, which are used to provide a light source for the display panel. The display panel is used to display an image. The controller is electrically connected to the display panel and the backlight module. After obtaining the average image level of each light-emitting channel in the backlight module, the target average image level is determined based on the average image level of each light-emitting channel, and then the average image level of the light-emitting channel to be adjusted whose average image level is greater than a preset lower limit value is determined as the target average image level. Thus, the average image level of the light-emitting channel to be adjusted can be unified to the target average image level, which solves the display color cast problem caused by the average image level of the light-emitting channel, thereby improving the display effect.

[0014] In one of the embodiments, the controller is further configured to: determine the gain of the target backlight brightness based on the target average image level and a preset gain curve corresponding to the light-emitting channel to be adjusted; and determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the target backlight brightness.

[0015] Therefore, on the basis of adjusting the average image level of the light emitting channel to be adjusted, the gain of the backlight brightness of the light emitting channel to be adjusted can be further adjusted, which is beneficial to improving the color dynamic range of the light emitting channel.

[0016] In one of the embodiments, the controller is further configured to: adjust the gain of the target backlight brightness based on a preset adjustment coefficient; determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the adjusted target backlight brightness; the gain of the adjusted target backlight brightness is greater than the gain of the target backlight brightness before adjustment.

[0017] Thereby, the gain of the backlight brightness of the light emitting channel to be adjusted can be increased, thereby improving the backlight brightness of the light emitting channel to be adjusted and improving the display effect.

[0018] In one of the embodiments, the controller is further configured to: when the number of light-emitting channels whose average image level is greater than a preset lower limit is three, determine the target average image level as the maximum value of the average image levels greater than the preset lower limit corresponding to the three light-emitting channels.

[0019] Thereby, the gain of the backlight brightness can be reduced and the gain of the backlight brightness can be controlled within a reasonable range, which is beneficial to improving the display quality.

[0020] In one of the embodiments, the controller is further configured to: when the number of light-emitting channels whose average image level is greater than a preset lower limit value is two, determine the target average image level as the minimum value of the average image levels corresponding to the two light-emitting channels that are greater than the preset lower limit value.

[0021] Thereby, the backlight brightness gain and the luminous brightness of the luminous channel to be adjusted can be improved, which is beneficial to improving the display quality.

[0022] In one of the embodiments, the controller is further configured to: when the number of light emitting channels whose average image level is greater than a preset lower limit is one, determine the target average image level to be an average image level greater than the preset lower limit.

[0023] Therefore, the implementation process is simple, and the backlight brightness gain and luminous brightness of the luminous channel to be adjusted can be improved, which is beneficial to improving the display quality.

[0024] In one embodiment, the light emitting channels include three channels of RGB, which can realize rich color changes and mixing, good color expression, good energy efficiency and good color gamut.

[0025] In one of the embodiments, the controller is further configured to: receive an image signal, determine backlight data of each light-emitting channel in the backlight module based on the image signal; and determine an average image level of each light-emitting channel according to the backlight data of each light-emitting channel.

[0026] Therefore, the average image level of each light-emitting channel can be obtained by calculation, thereby improving the accuracy of the average image level of the light-emitting channel.

[0027] In a second aspect, the present application further provides a method for controlling a display device, the display device comprising:

[0028] A display panel, used for displaying images;

[0029] A backlight module, used to provide a light source for the display panel; the backlight module includes at least two light-emitting chips emitting light of different wavelengths;

[0030] A controller, electrically connected to the display panel and the backlight module;

[0031] The method comprises:

[0032] Obtaining an average image level of each light-emitting channel in the backlight module; the light-emitting channel includes one or more light-emitting chips emitting light of the same wavelength;

[0033] Determining a target average image level based on the average image levels of each light emitting channel;

[0034] The average image level of the light-emitting channel to be adjusted is determined as the target average image level; the light-emitting channel to be adjusted is a light-emitting channel whose average image level is greater than a preset lower limit value.

[0035] In a third aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0036] In a fourth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0037] The control method, computer-readable storage medium, and computer program product of the display device described above, after obtaining the average image level of each light-emitting channel in the backlight module, determine the target average image level based on the average image level of each light-emitting channel, and then determine the average image level of the light-emitting channel to be adjusted whose average image level is greater than a preset lower limit as the target average image level. Thus, the average image level of the light-emitting channel to be adjusted can be unified as the target average image level, solving the display color cast problem caused by the average image level of the light-emitting channel, thereby improving the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions 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 related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A structural diagram of a display device in one embodiment;

[0040] Figure 2 A schematic diagram of a structure of a driver architecture of a display device in one embodiment;

[0041] Figure 3 The gain curve diagram of the three light-emitting channels of RGB in one embodiment;

[0042] Figure 4 A schematic flow chart of a method for controlling a display device in one embodiment;

[0043] Figure 5 is a flow chart of a method for controlling a display device in another embodiment;

[0044] Figure 6 It is a flowchart of a step of determining the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the target backlight brightness in one embodiment;

[0045] Figure 7 is a flow chart of a method for controlling a display device in yet another embodiment;

[0046] Figure 8 It is a schematic flow chart of the step of obtaining the average image level of each light-emitting channel in the backlight module in one embodiment;

[0047] Fig. 9 A diagram showing a preset gain curve of a red light emitting channel and a green light emitting channel and a gain curve obtained by remapping in one embodiment;

[0048] Fig.10 A diagram showing a preset gain curve of a blue light emitting channel and a gain curve obtained by remapping in one embodiment;

[0049] Fig.11 It is a detailed flowchart of a method for controlling a display device in yet another embodiment. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] In one embodiment, a display device is provided, such as Figure 1 As shown, the display device includes a backlight module 100, a display panel 200 and a controller (not shown in the figure).

[0052] The display panel 200 is located on the light-emitting side of the backlight module 100 and is used to display images. The display panel 200 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 on the pixel unit from the backlight module 100, so that the light transmitted by all pixel units constitutes the displayed image.

[0053] The backlight module 100 is used to provide a light source for the display panel 200. The backlight module 100 can emit light uniformly in the entire light emitting surface, and is used to provide light with sufficient brightness and uniform distribution.

[0054] The above-mentioned display device can be a display product such as a liquid crystal display screen, a liquid crystal display, an instrument panel, etc., or a mobile terminal product such as a monitor, a mobile phone, a tablet computer, a smart photo album, etc. The display device uses a backlight module 100 to provide backlight, and the display panel 200 modulates the light emitted by the backlight module 100 to realize image display. In a specific application scenario, the display device can be a liquid crystal TV.

[0055] The backlight module 100 includes at least two light-emitting chips that emit light of different wavelengths, for example, it may include two, three, four or more light-emitting chips that emit light of different wavelengths, and the light of different wavelengths is light of different colors. The backlight module 100 can mix the light emitted by the multiple light-emitting chips it includes to obtain mixed light of a specific color. Exemplarily, the backlight module 100 includes a red light-emitting chip, a green light-emitting chip and a blue light-emitting chip. When the red light-emitting chip, the green light-emitting chip and the blue light-emitting chip all emit light, the emitted red, green and blue light can be mixed to obtain white light, and the backlight module 100 can emit white light. In addition, in the backlight module 100, the number of light-emitting chips that emit light of the same wavelength can be one or more, which is convenient for color adjustment and brightness adjustment. Exemplarily, in the backlight module 100, two red light-emitting chips can be included to increase the brightness of the red light. It can be understood that the color of the light emitted by the backlight module 100 is different due to the different types of light-emitting chips included in the backlight module 100 , and can be set according to actual needs and is not limited here.

[0056] In addition, the backlight module may also include a substrate and a light-emitting driving circuit arranged on the substrate. Among them, the substrate has a bearing and supporting function. The substrate may be a printed circuit board (PCB), and the shape of the substrate may be selected according to the specific situation, for example, it may be a quadrilateral, a circle or a rectangle. The substrate is also provided with a wiring to realize the electrical connection between the light-emitting chip and the light-emitting driving circuit. The light-emitting driving circuit is a key part for controlling the brightness and color of the light-emitting chip. The specific structure of the light-emitting driving circuit does not need to be limited, and those skilled in the art may set it according to the specific situation. Exemplarily, the light-emitting driving circuit includes a controller, which is electrically connected to the display panel and the backlight module. The controller is used to receive an image signal from the outside, perform image processing, obtain a panel control signal and a backlight control signal, and output them to the display panel and the backlight module respectively. The panel control signal is used to control the display state of the display panel, and the backlight control signal is used to control the light-emitting state of the backlight module. Exemplarily, the backlight control signal includes a signal that can drive the light-emitting chip in the backlight module to emit light.

[0057] Furthermore, if Figure 2As shown, the controller 300 is an integrated device, which may include a system-level chip 320, a central control chip 340 and a backlight driver chip 360. The system-level chip 320 is used to receive image signals from the outside. The system-level chip 320 is connected to the central control chip 340, and the central control chip 340 is connected to the backlight driver chip 360. The backlight driver chip 360 is used to connect to the backlight module 100 and output a backlight control signal to the backlight module 100. The backlight driver chip 360 can be specifically connected to the light-emitting chip in the backlight module 100, and the light-emitting chip is used to provide a light source for the display panel 200. In addition, the system-level chip 320 is also connected to the timing controller, and can output a panel control signal to the timing controller. The timing controller is used to convert the signal transmitted from the system-level chip 320 into the signal required by the display panel 200. Thus, the display panel 200 can display content corresponding to the image signal from the outside.

[0058] It can be understood that when the controller executes relevant steps to achieve control of the display device, for example, when executing a control method for the display device, specific steps can be executed by specific devices included in the controller according to different step contents to achieve specific implementation effects. The following will provide a detailed explanation in combination with the structure and working principle of the controller.

[0059] In actual implementation, the backlight module can be divided into zones, and the light sources in each zone can be dimmed independently, thereby achieving more refined dynamic control and improving the dynamic contrast of the liquid crystal display. The backlight module can be equipped with multiple light-emitting chips, which form different light-emitting channels for emitting light of different colors to display multiple colors.

[0060] Taking the example that the light-emitting chip includes RGB three-color chips (red light-emitting chip, green light-emitting chip, blue light-emitting chip) to form three light-emitting channels, when determining the gain, the brightness gain of the current channel is determined according to the different APLs (Average Picture Levels) of the three light-emitting channels. Specifically, the brightness of the three light-emitting channels in the full white field can be determined according to the stored white field brightness and color coordinates, so as to obtain the following: Figure 3 The gain curve shown is the gain curve compared to full white field (APL R =APL G =APL B =255) is the brightness gain of the three channels at different APLs. R is the APL value of the red luminescence channel, APL G is the APL value of the green luminescence channel, APL B is the APL value of the blue emission channel.

[0061] To ensure that the gray or white small window at different APLs is consistent with the full white field color coordinates, R =APL G =APL B In the case of , the three gain curves corresponding to the three light-emitting channels are basically the same. However, in actual usage scenarios, the APL of the three light-emitting channels cannot be completely consistent, which leads to inconsistent brightness gains of the three channels, resulting in display color cast problems.

[0062] In order to solve the above-mentioned problem of display color cast, the present application provides a display device, which includes a backlight module, a display panel and a controller. The controller is configured to: obtain the average image level of each light-emitting channel in the backlight module, and then determine the target average image level based on the average image level of each light-emitting channel, and then determine the average image level of the light-emitting channel to be adjusted as the target average image level.

[0063] The backlight module includes a plurality of light-emitting channels, and each light-emitting channel emits light of one wavelength. After the light emitted from each light-emitting channel is mixed, the color of the light can be changed to obtain light of a required color. Exemplarily, the backlight module includes three light-emitting channels, namely a red light-emitting channel, a green light-emitting channel, and a blue light-emitting channel. After the red light emitted from the red light-emitting channel, the green light emitted from the green light-emitting channel, and the blue light emitted from the blue light-emitting channel are mixed, white light can be obtained.

[0064] In addition, a light-emitting channel includes one or more light-emitting chips that emit light of the same wavelength. A light-emitting channel emits light of one wavelength, that is, emits light of one color. In a light-emitting channel, one light-emitting chip may be included, or two, three, four or more light-emitting chips that emit light of the same wavelength may be included. For example, a red light-emitting channel may include one, two, three, four or more light-emitting chips that emit red light.

[0065] The controller first obtains the average image level of each light-emitting channel in the backlight module. Exemplarily, after receiving the image signal from the outside, the controller performs image processing and analysis on the image signal from the outside to obtain the average image level of each light-emitting channel. In the case where the controller includes a system-level chip, a central control chip and a backlight driver chip, the system-level chip can receive the image signal from the outside, process it to obtain a processed signal, and then transmit the processed signal to the central control chip. The central control chip performs signal analysis and calculation on the received signal to obtain the average image level of each light-emitting channel. Furthermore, the image signal from the outside can be received by the image quality chip in the system-level chip, and the system-level chip and the central control chip can establish a communication connection through SPI (Serial Peripheral Interface).

[0066] Afterwards, the controller determines the target average image level based on the average image level of each light-emitting channel. Among them, the way in which the controller determines the target average image level based on the average image level of each light-emitting channel is not unique. For example, the controller can select one from the average image levels of each light-emitting channel as the target average image level. Alternatively, the controller can also perform corresponding processing on the average image level of each light-emitting channel, and then determine the target average image level based on the processing result. It can be understood that in other embodiments, the controller can also determine the target average image level in other ways, which are not limited here. In the case where the controller includes a system-level chip, a central control chip and a backlight driver chip, the central control chip can determine the target average image level based on the average image level of each light-emitting channel.

[0067] Next, after the controller determines the target average image level, it determines the average image level of the light-emitting channel to be adjusted as the target average image level. It can be understood that when the controller includes a system-level chip, a central control chip and a backlight driver chip, the central control chip can determine the average image level of the light-emitting channel to be adjusted as the target average image level.

[0068] The light-emitting channel to be adjusted is a light-emitting channel with an average image level greater than a preset lower limit. After the controller obtains the average image level of each light-emitting channel, the average image level is divided into two categories: a light-emitting channel with an average image level less than or equal to the preset lower limit and a light-emitting channel with an average image level greater than the preset lower limit, thereby obtaining two categories of channels: a light-emitting channel with an average image level less than or equal to the preset lower limit and a light-emitting channel with an average image level greater than the preset lower limit.

[0069] For the light-emitting channels whose average image level is less than or equal to the preset lower limit, the controller does not adjust the average image level of this type of light-emitting channels, and the average image level of this type of light-emitting channels is maintained to be less than or equal to the preset lower limit.

[0070] The light channels whose average image level is greater than the preset lower limit are also called the light channels to be adjusted. For the light channels to be adjusted, no matter what the original average image level of the light channels is, the controller uniformly determines the average image level of the light channels to be adjusted as the target average image level. Thus, the average image level of the light channels greater than the preset lower limit can be made uniform.

[0071] The value of the preset lower limit is not limited and can be set according to actual needs. The average image level is less than or equal to the preset lower limit, indicating that the average image level is very small, for example, it can be 0. The average image level is greater than the preset lower limit, indicating that the average image level is not very small, for example, it can be non-0.

[0072] The above-mentioned display device includes a display panel, a backlight module and a controller. The backlight module includes at least two light-emitting chips that emit light of different wavelengths, which are used to provide a light source for the display panel. The display panel is used to display an image. The controller is electrically connected to the display panel and the backlight module. After obtaining the average image level of each light-emitting channel in the backlight module, the target average image level is determined based on the average image level of each light-emitting channel, and then the average image level of the light-emitting channel to be adjusted whose average image level is greater than a preset lower limit value is determined as the target average image level. Thus, the average image level of the light-emitting channel to be adjusted can be unified to the target average image level, which solves the display color cast problem caused by the average image level of the light-emitting channel, thereby improving the display effect.

[0073] Further, in an exemplary embodiment, the controller is also configured to: determine the gain of the target backlight brightness based on the target average image level and a preset gain curve corresponding to the light-emitting channel to be adjusted, and determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the target backlight brightness.

[0074] The preset gain curve represents the relationship between the average image level of the light-emitting channel and the gain of the backlight brightness. The preset gain curve is a pre-stored curve that can be directly called when needed. The preset gain curve can be a stored curve after being tested under laboratory conditions when the backlight module leaves the factory.

[0075] After the controller determines the target average image level, the controller can determine the gain of the backlight brightness corresponding to the target average image level in combination with the relationship between the average image level of the light-emitting channel to be adjusted and the gain of the backlight brightness represented by the preset gain curve corresponding to the light-emitting channel to be adjusted, as the gain of the target backlight brightness. Taking the preset gain curve corresponding to the light-emitting channel to be adjusted in a coordinate system in which the horizontal axis is the average image level and the vertical axis is the gain of the backlight brightness as an example, after the target average image level is determined, the position of the target average image level in the horizontal axis is located, and then the position in the vertical axis corresponding to the determined position in the horizontal axis in the preset gain curve is determined, and the gain of the backlight brightness corresponding to the position in the vertical axis is the gain of the target backlight brightness.

[0076] Afterwards, the controller uses the gain of the target backlight brightness as the gain of the backlight brightness of the light-emitting channel to be adjusted. When the target average image level is different from the average image level of the light-emitting channel to be adjusted before adjustment, the gain of the target backlight brightness is also different from the gain of the backlight brightness of the light-emitting channel to be adjusted before adjustment. Therefore, after adjusting the average image level of the light-emitting channel to be adjusted, the gain of the backlight brightness of the light-emitting channel to be adjusted can be re-determined based on the adjusted average image level, thereby achieving the adjustment of the gain of the backlight brightness of the light-emitting channel to be adjusted.

[0077] Expandably, after the controller determines the final average image level and backlight brightness gain of the light-emitting channel to be adjusted, it can remap the gain curve of the light-emitting channel to be adjusted according to the final determined average image level and backlight brightness gain, and then update the preset gain curve of the light-emitting channel to be adjusted with the gain curve of the remapped light-emitting channel. Subsequently, the light-emitting channel to be adjusted can be controlled to emit light according to the updated gain curve to improve the light quality.

[0078] It can be understood that, in the case where the controller includes a system-level chip, a central control chip, and a backlight driver chip, the central control chip can determine the gain of the target backlight brightness according to the target average image level and the preset gain curve corresponding to the light-emitting channel to be adjusted, and determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the target backlight brightness. Afterwards, the central control chip can convert the determined gain of the backlight brightness of the light-emitting channel to be adjusted into a backlight current and transmit it to the backlight driver chip, and the backlight driver chip controls the light-emitting chip to emit light based on the backlight current.

[0079] In this embodiment, the gain of the target backlight brightness is determined according to the target average image level and the preset gain curve corresponding to the light-emitting channel to be adjusted, and the gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the gain of the target backlight brightness. On the basis of adjusting the average image level of the light-emitting channel to be adjusted, the gain of the backlight brightness of the light-emitting channel to be adjusted can be further adjusted, which is conducive to improving the color dynamic range of the light-emitting channel.

[0080] In addition, the way in which the controller determines the gain of the backlight brightness of the light-emitting channel to be adjusted is not unique. Exemplarily, in one embodiment, the controller is further configured to: adjust the gain of the target backlight brightness based on a preset adjustment coefficient, and determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the adjusted target backlight brightness.

[0081] The gain of the target backlight brightness after adjustment is greater than the gain of the target backlight brightness before adjustment.

[0082] The value of the preset adjustment coefficient is not limited and can be determined according to actual needs. The way to adjust the gain of the target backlight brightness based on the preset adjustment coefficient is not unique. For example, the product of the preset adjustment coefficient and the gain of the target backlight brightness can be used as the gain of the adjusted target backlight brightness, and the preset adjustment coefficient is greater than 1, so that the gain of the adjusted target backlight brightness is greater than the gain of the target backlight brightness before adjustment. Alternatively, the sum of the preset adjustment coefficient and the gain of the target backlight brightness can be used as the gain of the adjusted target backlight brightness, and the preset adjustment coefficient is greater than 0, so that the gain of the adjusted target backlight brightness is greater than the gain of the target backlight brightness before adjustment.

[0083] After adjusting the gain of the target backlight brightness, the gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the adjusted gain of the target backlight brightness to increase the gain of the backlight brightness of the light-emitting channel to be adjusted.

[0084] It can be understood that when the controller includes a system-level chip, a central control chip and a backlight driver chip, the central control chip can adjust the gain of the target backlight brightness based on a preset adjustment coefficient, and determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the adjusted target backlight brightness.

[0085] In this embodiment, the gain of the target backlight brightness is adjusted based on the preset adjustment coefficient, and the gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the gain of the adjusted target backlight brightness. The gain of the backlight brightness of the light-emitting channel to be adjusted can be increased, thereby improving the backlight brightness of the light-emitting channel to be adjusted and improving the display effect.

[0086] In addition, the method of determining the target average image level based on the average image level of each light-emitting channel is not unique, and the present application provides a variety of embodiments for explanation.

[0087] In an optional embodiment, when the number of luminous channels whose average image levels are greater than a preset lower limit is three, the target average image level is determined to be the maximum value of the average image levels corresponding to the three luminous channels that are greater than the preset lower limit.

[0088] It should be noted that, when the number of light-emitting channels whose average image levels are greater than the preset lower limit is three, it means that the number of light-emitting channels whose average image levels are greater than the preset lower limit is too large, that is, the number of light-emitting channels that need to emit light is too large. In this case, the target average image level is determined to be the maximum value of the average image levels greater than the preset lower limit corresponding to the three light-emitting channels, so that the sum of the average image levels of the light-emitting channels whose average image levels are greater than the preset lower limit is increased as a whole, thereby reducing the gain of the backlight brightness, reducing the backlight power, and reducing the adverse effect of excessive backlight power on the display quality.

[0089] For example, when the number of light-emitting channels whose average image level is greater than the preset lower limit is three, namely, the red light-emitting channel, the green light-emitting channel, and the blue light-emitting channel, the maximum value of the average image levels of the red light-emitting channel, the green light-emitting channel, and the blue light-emitting channel is taken as the target average image level, and the average image levels of the red light-emitting channel, the green light-emitting channel, and the blue light-emitting channel are unified as the target average image level, which can prevent the backlight power from exceeding the full white field power, and is beneficial to improving the display quality.

[0090] Expandably, when the number of luminous channels whose average image level is greater than a preset lower limit is three, after determining the target average image level, the gain of the target backlight brightness can be determined based on the target average image level and the preset gain curve corresponding to the luminous channel to be adjusted, and the gain of the target backlight brightness can be used as the gain of the backlight brightness of the luminous channel to be adjusted. There is no need to use the preset adjustment coefficient to adjust the gain of the backlight brightness, that is, there is no need to further increase the gain of the backlight brightness of the luminous channel to be adjusted, so as to avoid the adverse effect of excessive backlight brightness gain on the display effect.

[0091] It can be understood that when the controller includes a system-level chip, a central control chip and a backlight driver chip, the central control chip can determine that the target average image level is the maximum value of the average image levels greater than the preset lower limit value corresponding to the three light-emitting channels when the number of light-emitting channels whose average image level is greater than the preset lower limit value is three.

[0092] In the present embodiment, when the number of light-emitting channels whose average image level is greater than the preset lower limit is three, the target average image level is determined to be the maximum value of the average image levels corresponding to the three light-emitting channels that are greater than the preset lower limit, thereby reducing the gain of the backlight brightness. The gain of the backlight brightness can be controlled within a reasonable range, which is beneficial to improving the display quality.

[0093] In another optional embodiment, when the number of luminous channels whose average image levels are greater than the preset lower limit is two, the target average image level is determined to be the minimum value of the average image levels of the two luminous channels that are greater than the preset lower limit.

[0094] It should be noted that, when the number of light-emitting channels whose average image level is greater than the preset lower limit is two, it means that the number of light-emitting channels whose average image level is greater than the preset lower limit is moderate. In this case, the target average image level is determined to be the minimum value of the average image levels greater than the preset lower limit corresponding to the two light-emitting channels, so that the sum of the average image levels of the light-emitting channels whose average image levels are greater than the preset lower limit is reduced as a whole, thereby increasing the gain of the backlight brightness, increasing the backlight power, and increasing the luminous brightness of the light-emitting channels whose average image levels are greater than the preset lower limit, which is conducive to enhancing the display effect.

[0095] For example, when the number of light channels whose average image level is greater than the preset lower limit value is two, namely the red light channel and the green light channel, the minimum value of the average image levels of the red light channel and the green light channel is taken as the target average image level, and the average image levels of the red light channel and the green light channel are unified as the target average image level to increase the luminous brightness of the red light channel and the green light channel.

[0096] In an extensible manner, when the number of light-emitting channels whose average image level is greater than the preset lower limit is two, after determining the target average image level, the gain of the target backlight brightness can be determined according to the preset gain curve corresponding to the target average image level and the light-emitting channel to be adjusted, and then the gain of the target backlight brightness is adjusted based on the preset adjustment coefficient, and the adjusted gain of the target backlight brightness is used as the gain of the backlight brightness of the light-emitting channel to be adjusted. Thus, after re-determining the gain of the backlight brightness of the backlight channel to be adjusted according to the adjusted average image level, the gain of the backlight brightness of the light-emitting channel to be adjusted is further increased based on the preset adjustment coefficient to improve the display effect.

[0097] It can be understood that when the controller includes a system-level chip, a central control chip and a backlight driver chip, the central control chip can determine that the target average image level is the minimum value of the average image levels corresponding to the two light-emitting channels that are greater than the preset lower limit value when the number of light-emitting channels whose average image level is greater than the preset lower limit value is two.

[0098] In this embodiment, when the number of light-emitting channels whose average image levels are greater than the preset lower limit is two, the target average image level is determined to be the minimum value of the average image levels corresponding to the two light-emitting channels that are greater than the preset lower limit, thereby increasing the gain and luminous brightness of the backlight brightness of the light-emitting channel to be adjusted, which is beneficial to improving the display quality.

[0099] In another optional embodiment, when the number of light emitting channels whose average image level is greater than a preset lower limit is one, the target average image level is determined to be an average image level greater than the preset lower limit.

[0100] It should be noted that, when the number of luminous channels whose average image level is greater than the preset lower limit is one, it means that the number of luminous channels whose average image level is greater than the preset lower limit is small. In this case, determining the target average image level as the average image level greater than the preset lower limit is simple in implementation.

[0101] For example, when there is one light emitting channel whose average image level is greater than the preset lower limit, which is the red light emitting channel, the average image level of the red light emitting channel is used as the target average image level, that is, the average image level of the red light emitting channel is maintained unchanged.

[0102] In an extensible manner, when the number of light-emitting channels whose average image level is greater than the preset lower limit is one, after determining the target average image level, the gain of the target backlight brightness can be determined according to the preset gain curve corresponding to the target average image level and the light-emitting channel to be adjusted, and then the gain of the target backlight brightness is adjusted based on the preset adjustment coefficient, and the adjusted gain of the target backlight brightness is used as the gain of the backlight brightness of the light-emitting channel to be adjusted. Thus, after re-determining the gain of the backlight brightness of the backlight channel to be adjusted according to the adjusted average image level, the gain of the backlight brightness of the light-emitting channel to be adjusted is further increased based on the preset adjustment coefficient to improve the display effect.

[0103] It can be understood that when the controller includes a system-level chip, a central control chip and a backlight driver chip, the central control chip can determine that the target average image level is an average image level greater than the preset lower limit value when the number of light-emitting channels whose average image level is greater than the preset lower limit value is one.

[0104] In this embodiment, when the number of luminous channels whose average image level is greater than the preset lower limit is one, the target average image level is determined to be an average image level greater than the preset lower limit. The implementation process is simple and can also increase the backlight brightness gain and luminous brightness of the luminous channel to be adjusted, which is beneficial to improving the display quality.

[0105] The types of light-emitting channels are not unique. In an exemplary embodiment, the light-emitting channels include three channels: RGB.

[0106] Among them, the three RGB channels include red light-emitting channel, green light-emitting channel and blue light-emitting channel. When the red light-emitting channel, green light-emitting channel and blue light-emitting channel are all emitting light, the emitted red, green and blue light can be mixed to obtain white light. By controlling the brightness of the three colors of red, green and blue, rich color changes and mixing can be achieved, with bright colors and good restoration, which has better performance in color performance than ordinary white light LEDs. In addition, the traditional light-emitting method of using LED blue light to excite phosphors and quantum dots, although the luminous efficiency has been significantly improved, when used as white light in color liquid crystal display backlight sources, under the principle of additive color mixing, there is still obvious energy waste, especially when displaying high-saturation images, the energy waste is more serious. In comparison, the backlight LCD module with RGB three-color LED light source is conducive to further improvement in energy efficiency and color gamut of TV products.

[0107] In this embodiment, the light-emitting channels include three RGB channels, which can achieve rich color changes and mixing, good color expression, good energy efficiency performance, and excellent color gamut.

[0108] In addition, the way in which the controller obtains the average image level of each light-emitting channel in the backlight module is not unique. Exemplarily, in one embodiment, the controller is configured to: receive an image signal, determine the backlight data of each light-emitting channel in the backlight module based on the image signal; and determine the average image level of each light-emitting channel based on the backlight data of each light-emitting channel.

[0109] After receiving the image signal from the outside, the controller performs image processing and analysis on the image signal from the outside, for example, color dimming processing can be performed to obtain backlight data of each light-emitting channel. Further, the average image level of each light-emitting channel is determined based on the backlight data of each light-emitting channel. Exemplarily, the mean value of the backlight data of each light-emitting channel can be used as the average image level of each light-emitting channel.

[0110] It can be understood that when the controller includes a system-level chip, a central control chip and a backlight driver chip, the system-level chip can receive an image signal from the outside, obtain backlight data of each light-emitting channel after processing, and then transmit the backlight data of each light-emitting channel to the central control chip. The central control chip receives the backlight data of each light-emitting channel, calculates the mean of the backlight data, and obtains the value of the average image level.

[0111] In this embodiment, an image signal is received, and backlight data of each light-emitting channel in the backlight module is determined based on the image signal. The average image level of each light-emitting channel is determined according to the backlight data of each light-emitting channel. The average image level of each light-emitting channel can be obtained by calculation, thereby improving the accuracy of the average image level of the light-emitting channel.

[0112] An embodiment of the present application further provides a method for controlling a display device, wherein the display device includes a backlight module, a display panel, and a controller.

[0113] The display panel is located on the light-emitting side of the backlight module and is used to display images. The display panel 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 on the pixel unit from the backlight module, so that the light transmitted by all pixel units constitutes the displayed image.

[0114] The backlight module is used to provide a light source for the display panel. The backlight module can emit light evenly across the entire light-emitting surface, and is used to provide light with sufficient brightness and even distribution. The backlight module includes at least two light-emitting chips that emit light of different wavelengths, for example, it may include two, three, four or more light-emitting chips that emit light of different wavelengths, and light of different wavelengths is light of different colors.

[0115] The controller is electrically connected to the display panel and the backlight module, and the controller can execute the steps of the control method of the display device.

[0116] like Figure 4 As shown, the control method of the display device includes the following steps:

[0117] Step 402, obtaining the average image level of each light-emitting channel in the backlight module.

[0118] The backlight module includes a plurality of light-emitting channels, and each light-emitting channel emits light of one wavelength. After the light emitted from each light-emitting channel is mixed, the color of the light can be changed to obtain light of a required color. Exemplarily, the backlight module includes three light-emitting channels, namely a red light-emitting channel, a green light-emitting channel, and a blue light-emitting channel. After the white light emitted from the red light-emitting channel, the green light emitted from the green light-emitting channel, and the blue light emitted from the blue light-emitting channel are mixed, white light can be obtained.

[0119] In addition, a light-emitting channel includes one or more light-emitting chips that emit light of the same wavelength. A light-emitting channel emits light of one wavelength, that is, emits light of one color. In a light-emitting channel, one light-emitting chip may be included, or two, three, four or more light-emitting chips that emit light of the same wavelength may be included. For example, a red light-emitting channel may include one, two, three, four or more light-emitting chips that emit red light.

[0120] The controller first obtains the average image level of each light-emitting channel in the backlight module. Exemplarily, after receiving the image signal from the outside, the controller performs image processing and analysis on the image signal from the outside to obtain the average image level of each light-emitting channel. In the case where the controller includes a system-level chip, a central control chip and a backlight driver chip, the system-level chip can receive the image signal from the outside, process it to obtain a processed signal, and then transmit the processed signal to the central control chip. The central control chip performs signal analysis and calculation on the received signal to obtain the average image level of each light-emitting channel. Furthermore, the image signal from the outside can be received by the image quality chip in the system-level chip, and the system-level chip and the central control chip can establish a communication connection through SPI (Serial Peripheral Interface).

[0121] Step 404 : determining a target average image level based on the average image levels of each light emitting channel.

[0122] The way in which the controller determines the target average image level based on the average image level of each light-emitting channel is not unique. For example, the controller may select one of the average image levels of each light-emitting channel as the target average image level. Alternatively, the controller may perform corresponding processing on the average image level of each light-emitting channel and then determine the target average image level based on the processing result. It is understood that in other embodiments, the controller may also determine the target average image level in other ways, which are not limited here.

[0123] Step 406: determine the average image level of the light-emitting channel to be adjusted as the target average image level.

[0124] The light-emitting channel to be adjusted is a light-emitting channel with an average image level greater than a preset lower limit. After the controller obtains the average image level of each light-emitting channel, the average image level is divided into two categories: a light-emitting channel with an average image level less than or equal to the preset lower limit and a light-emitting channel with an average image level greater than the preset lower limit, thereby obtaining two categories of channels: a light-emitting channel with an average image level less than or equal to the preset lower limit and a light-emitting channel with an average image level greater than the preset lower limit.

[0125] For the light-emitting channels whose average image level is less than or equal to the preset lower limit, the controller does not adjust the average image level of this type of light-emitting channels, and the average image level of this type of light-emitting channels is maintained to be less than or equal to the preset lower limit.

[0126] The light channels whose average image level is greater than the preset lower limit are also called the light channels to be adjusted. For the light channels to be adjusted, no matter what the original average image level of the light channels is, the controller uniformly determines the average image level of the light channels to be adjusted as the target average image level. Thus, the average image level of the light channels greater than the preset lower limit can be made uniform.

[0127] The control method of the display device described above determines the target average image level based on the average image level of each light-emitting channel in the backlight module after obtaining the average image level of each light-emitting channel, and then determines the average image level of the light-emitting channel to be adjusted whose average image level is greater than a preset lower limit as the target average image level. Thus, the average image level of the light-emitting channel to be adjusted can be unified as the target average image level, solving the display color cast problem caused by the average image level of the light-emitting channel, thereby improving the display effect.

[0128] In an exemplary embodiment, Figure 5 As shown, the control method of the display device further includes step 508 and step 510.

[0129] Step 508 : determining the gain of the target backlight brightness according to the target average image level and the preset gain curve corresponding to the light emitting channel to be adjusted.

[0130] The preset gain curve represents the relationship between the average image level of the light-emitting channel and the gain of the backlight brightness. The preset gain curve is a pre-stored curve that can be directly called when needed. The preset gain curve can be a stored curve after being tested under laboratory conditions when the backlight module leaves the factory.

[0131] After the controller determines the target average image level, the controller can determine the gain of the backlight brightness corresponding to the target average image level in combination with the relationship between the average image level of the light-emitting channel to be adjusted and the gain of the backlight brightness represented by the preset gain curve corresponding to the light-emitting channel to be adjusted, as the gain of the target backlight brightness. Taking the preset gain curve corresponding to the light-emitting channel to be adjusted in a coordinate system in which the horizontal axis is the average image level and the vertical axis is the gain of the backlight brightness as an example, after the target average image level is determined, the position of the target average image level in the horizontal axis is located, and then the position in the vertical axis corresponding to the determined position in the horizontal axis in the preset gain curve is determined, and the gain of the backlight brightness corresponding to the position in the vertical axis is the gain of the target backlight brightness.

[0132] Step 510: determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the target backlight brightness.

[0133] When the target average image level is different from the average image level of the light-emitting channel to be adjusted before adjustment, the gain of the target backlight brightness is also different from the gain of the backlight brightness of the light-emitting channel to be adjusted before adjustment. Therefore, after adjusting the average image level of the light-emitting channel to be adjusted, the gain of the backlight brightness of the light-emitting channel to be adjusted can be re-determined based on the adjusted average image level, thereby achieving the adjustment of the gain of the backlight brightness of the light-emitting channel to be adjusted.

[0134] Expandably, after the controller determines the final average image level and backlight brightness gain of the light-emitting channel to be adjusted, it can remap the gain curve of the light-emitting channel to be adjusted according to the final determined average image level and backlight brightness gain, and then update the preset gain curve of the light-emitting channel to be adjusted with the gain curve of the remapped light-emitting channel. Subsequently, the light-emitting channel to be adjusted can be controlled to emit light according to the updated gain curve to improve the light quality.

[0135] In this embodiment, the gain of the target backlight brightness is determined according to the target average image level and the preset gain curve corresponding to the light-emitting channel to be adjusted, and the gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the gain of the target backlight brightness. On the basis of adjusting the average image level of the light-emitting channel to be adjusted, the gain of the backlight brightness of the light-emitting channel to be adjusted can be further adjusted, which is conducive to improving the color dynamic range of the light-emitting channel.

[0136] In an exemplary embodiment, Figure 6 As shown, step 510 includes step 610 and step 612 .

[0137] Step 610: Adjust the gain of the target backlight brightness based on a preset adjustment coefficient.

[0138] The value of the preset adjustment coefficient is not limited and can be determined according to actual needs. The way to adjust the gain of the target backlight brightness based on the preset adjustment coefficient is not unique. For example, the product of the preset adjustment coefficient and the gain of the target backlight brightness can be used as the gain of the adjusted target backlight brightness, and the preset adjustment coefficient is greater than 1, so that the gain of the adjusted target backlight brightness is greater than the gain of the target backlight brightness before adjustment. Alternatively, the sum of the preset adjustment coefficient and the gain of the target backlight brightness can be used as the gain of the adjusted target backlight brightness, and the preset adjustment coefficient is greater than 0, so that the gain of the adjusted target backlight brightness is greater than the gain of the target backlight brightness before adjustment.

[0139] Step 612: determine the gain of the backlight brightness of the light-emitting channel to be adjusted as the gain of the adjusted target backlight brightness.

[0140] The gain of the target backlight brightness after adjustment is greater than the gain of the target backlight brightness before adjustment.

[0141] After adjusting the gain of the target backlight brightness, the gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the adjusted gain of the target backlight brightness to increase the gain of the backlight brightness of the light-emitting channel to be adjusted.

[0142] In this embodiment, the gain of the target backlight brightness is adjusted based on the preset adjustment coefficient, and the gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the gain of the adjusted target backlight brightness. The gain of the backlight brightness of the light-emitting channel to be adjusted can be increased, thereby improving the backlight brightness of the light-emitting channel to be adjusted and improving the display effect.

[0143] In multiple optional embodiments, such as Figure 7 As shown, step 404 includes step 704 , step 706 or step 708 .

[0144] Step 704 , when there are three luminous channels whose average image levels are greater than the preset lower limit, determine the target average image level as the maximum value of the average image levels of the three luminous channels that are greater than the preset lower limit.

[0145] It should be noted that, when the number of light-emitting channels whose average image levels are greater than the preset lower limit is three, it means that the number of light-emitting channels whose average image levels are greater than the preset lower limit is too large, that is, the number of light-emitting channels that need to emit light is too large. In this case, the target average image level is determined to be the maximum value of the average image levels greater than the preset lower limit corresponding to the three light-emitting channels, so that the sum of the average image levels of the light-emitting channels whose average image levels are greater than the preset lower limit is increased as a whole, thereby reducing the gain of the backlight brightness, reducing the backlight power, and reducing the adverse effect of excessive backlight power on the display quality.

[0146] For example, when the number of light-emitting channels whose average image level is greater than the preset lower limit is three, namely, the red light-emitting channel, the green light-emitting channel, and the blue light-emitting channel, the maximum value of the average image levels of the red light-emitting channel, the green light-emitting channel, and the blue light-emitting channel is taken as the target average image level, and the average image levels of the red light-emitting channel, the green light-emitting channel, and the blue light-emitting channel are unified as the target average image level, which can prevent the backlight power from exceeding the full white field power, and is beneficial to improving the display quality.

[0147] Expandably, when the number of luminous channels whose average image level is greater than a preset lower limit is three, after determining the target average image level, the gain of the target backlight brightness can be determined based on the target average image level and the preset gain curve corresponding to the luminous channel to be adjusted, and the gain of the target backlight brightness can be used as the gain of the backlight brightness of the luminous channel to be adjusted. There is no need to use the preset adjustment coefficient to adjust the gain of the backlight brightness, that is, there is no need to further increase the gain of the backlight brightness of the luminous channel to be adjusted, so as to avoid the adverse effect of excessive backlight brightness gain on the display effect.

[0148] In the present embodiment, when the number of light-emitting channels whose average image level is greater than the preset lower limit is three, the target average image level is determined to be the maximum value of the average image levels corresponding to the three light-emitting channels that are greater than the preset lower limit, thereby reducing the gain of the backlight brightness. The gain of the backlight brightness can be controlled within a reasonable range, which is beneficial to improving the display quality.

[0149] Step 706 , when there are two luminous channels whose average image levels are greater than the preset lower limit, determine the target average image level as the minimum value of the average image levels of the two luminous channels that are greater than the preset lower limit.

[0150] It should be noted that, when the number of light-emitting channels whose average image level is greater than the preset lower limit is two, it means that the number of light-emitting channels whose average image level is greater than the preset lower limit is moderate. In this case, the target average image level is determined to be the minimum value of the average image levels greater than the preset lower limit corresponding to the two light-emitting channels, so that the sum of the average image levels of the light-emitting channels whose average image levels are greater than the preset lower limit is reduced as a whole, thereby increasing the gain of the backlight brightness, increasing the backlight power, and increasing the luminous brightness of the light-emitting channels whose average image levels are greater than the preset lower limit, which is conducive to enhancing the display effect.

[0151] For example, when the number of light channels whose average image level is greater than the preset lower limit value is two, namely the red light channel and the green light channel, the minimum value of the average image levels of the red light channel and the green light channel is taken as the target average image level, and the average image levels of the red light channel and the green light channel are unified as the target average image level to increase the luminous brightness of the red light channel and the green light channel.

[0152] In an extensible manner, when the number of light-emitting channels whose average image level is greater than the preset lower limit is two, after determining the target average image level, the gain of the target backlight brightness can be determined according to the preset gain curve corresponding to the target average image level and the light-emitting channel to be adjusted, and then the gain of the target backlight brightness is adjusted based on the preset adjustment coefficient, and the adjusted gain of the target backlight brightness is used as the gain of the backlight brightness of the light-emitting channel to be adjusted. Thus, after re-determining the gain of the backlight brightness of the backlight channel to be adjusted according to the adjusted average image level, the gain of the backlight brightness of the light-emitting channel to be adjusted is further increased based on the preset adjustment coefficient to improve the display effect.

[0153] In this embodiment, when the number of light-emitting channels whose average image levels are greater than the preset lower limit is two, the target average image level is determined to be the minimum value of the average image levels corresponding to the two light-emitting channels that are greater than the preset lower limit, thereby increasing the gain and luminous brightness of the backlight brightness of the light-emitting channel to be adjusted, which is beneficial to improving the display quality.

[0154] Step 708 : when the number of light-emitting channels whose average image level is greater than the preset lower limit is one, determine the target average image level as an average image level greater than the preset lower limit.

[0155] It should be noted that, when the number of luminous channels whose average image level is greater than the preset lower limit is one, it means that the number of luminous channels whose average image level is greater than the preset lower limit is small. In this case, determining the target average image level as the average image level greater than the preset lower limit is simple in implementation.

[0156] For example, when there is one light emitting channel whose average image level is greater than the preset lower limit, which is the red light emitting channel, the average image level of the red light emitting channel is used as the target average image level, that is, the average image level of the red light emitting channel is maintained unchanged.

[0157] In an extensible manner, when the number of light-emitting channels whose average image level is greater than the preset lower limit is one, after determining the target average image level, the gain of the target backlight brightness can be determined according to the preset gain curve corresponding to the target average image level and the light-emitting channel to be adjusted, and then the gain of the target backlight brightness is adjusted based on the preset adjustment coefficient, and the adjusted gain of the target backlight brightness is used as the gain of the backlight brightness of the light-emitting channel to be adjusted. Thus, after re-determining the gain of the backlight brightness of the backlight channel to be adjusted according to the adjusted average image level, the gain of the backlight brightness of the light-emitting channel to be adjusted is further increased based on the preset adjustment coefficient to improve the display effect.

[0158] In this embodiment, when the number of luminous channels whose average image level is greater than the preset lower limit is one, the target average image level is determined to be an average image level greater than the preset lower limit. The implementation process is simple and can also increase the backlight brightness gain and luminous brightness of the luminous channel to be adjusted, which is beneficial to improving the display quality.

[0159] In multiple optional embodiments, such as Figure 8 As shown, step 402 includes step 802 and step 804 .

[0160] Step 802: receiving an image signal, and determining backlight data of each light-emitting channel in the backlight module based on the image signal.

[0161] Step 804: Determine the average image level of each light-emitting channel according to the backlight data of each light-emitting channel.

[0162] After receiving the image signal from the outside, the controller performs image processing and analysis on the image signal from the outside, for example, color dimming processing can be performed to obtain backlight data of each light-emitting channel. Further, the average image level of each light-emitting channel is determined based on the backlight data of each light-emitting channel. Exemplarily, the mean value of the backlight data of each light-emitting channel can be used as the average image level of each light-emitting channel.

[0163] In this embodiment, an image signal is received, and backlight data of each light-emitting channel in the backlight module is determined based on the image signal. The average image level of each light-emitting channel is determined according to the backlight data of each light-emitting channel. The average image level of each light-emitting channel can be obtained by calculation, thereby improving the accuracy of the average image level of the light-emitting channel.

[0164] In order to better understand the above embodiment, a detailed explanation is given below in conjunction with a specific embodiment. In one embodiment, a control method for a display device is provided, wherein the display device includes a display panel, a backlight module, and a controller, wherein the backlight module includes an RGB three-color light-emitting chip, and the RGB three-color light-emitting chip forms an RGB three-color light-emitting channel. The control method for the display device can be executed by the controller, and specifically can include the following steps:

[0165] (1) When APL R (APL value of red light channel), APL G (APL value of green light channel), APL B When (the APL value of the blue light channel) is not 0:

[0166] In order to prevent the inconsistency of the APLs of the three light-emitting channels from causing inconsistency in the gains of the three light-emitting channels, thereby causing the color cast problem, the APL values ​​of the three light-emitting channels are unified into one APL value in this embodiment, as shown in the following formula (1):

[0167] APL=Max(APL R 、APL G 、APL B ) (1)

[0168] To prevent the power of the backlight brightness from exceeding the full white field power, the APL values ​​of the three light-emitting channels are set to the maximum value of the APLs of the three light-emitting channels.

[0169] (2) When only one of the three light-emitting channels has an APL value of 0, and the APL values ​​of the other two light-emitting channels are not 0, for example, B =0, APL R ≠0 and APL G ≠0,

[0170] Use the following methods (2)-(4) to redefine the APL value and backlight brightness gain:

[0171] APL R =APL G =Min(APL R ,APL G ) (2)

[0172] Peaking R1 =α*Peaking R , α∈[1,2] (3)

[0173] Peaking G1 =α*Peaking G , α∈[1,2] (4)

[0174] Among them, APL R is the APL value of the red luminescence channel, APL G is the APL value of the green luminescence channel, APL B is the APL value of the blue light channel, and α is the preset adjustment coefficient. R The gain of the backlight brightness of the red light channel before adjustment based on the preset adjustment coefficient. R1 The gain of the backlight brightness after the red light channel is adjusted based on the preset adjustment coefficient. G The gain of the backlight brightness of the green light channel before adjustment based on the preset adjustment coefficient. G1 The gain of the backlight brightness of the green light channel after adjustment based on the preset adjustment coefficient.

[0175] Fig. 9 The preset gain curves of the red light emitting channel and the green light emitting channel and the gain curves obtained by remapping the values ​​obtained based on equations (2)-(4). Fig. 9 In FIG. 1 , the dotted curve is the preset gain curve of the red light emitting channel and the green light emitting channel, and the solid curve is the gain curve obtained by remapping the red light emitting channel and the green light emitting channel.

[0176] like Fig. 9 As shown, due to APL B =0, so the backlight power of the blue light-emitting channel can be allocated to the red and green light-emitting channels, thereby improving the brightness of the red and green light-emitting channels, and then improving the color dynamic range.

[0177] APL only R =0 or APL only G = 0 is the same as the above case where only APL B =0 is similar and will not be described here.

[0178] (3) When only one of the three luminescence channels has an APL value that is not 0, and the APL values ​​of the other two luminescence channels are both 0, for example, B ≠0, APL R = 0 and APL G = 0,

[0179] The APL value of the red light channel and the gain of the backlight brightness are re-determined using the following methods (5)-(6):

[0180] APL B =APL B (5)

[0181] Peaking B2=β*Peaking B , β∈[1,3] (6)

[0182] Among them, APL R is the APL value of the red luminescence channel, APL G is the APL value of the green luminescence channel, APL B is the APL value of the blue light channel, and β is the preset adjustment coefficient. B The gain of the backlight brightness of the blue light channel before adjustment based on the preset adjustment coefficient. B2 The gain of the backlight brightness of the blue light channel after adjustment based on the preset adjustment coefficient.

[0183] Fig.10 The preset gain curve of the blue light emitting channel and the gain curve obtained by remapping the values ​​obtained based on equations (5)-(6). Fig.10 In FIG. 8 , the dotted curve is a preset gain curve of the blue light emitting channel, and the solid curve is a gain curve obtained by remapping the blue light emitting channel.

[0184] like Fig.10 As shown, due to APL R = 0 and APL G =0, so the backlight power of the red and green light-emitting channels can be allocated to the blue light-emitting channel, thereby improving the brightness of the blue light-emitting channel and further improving the color dynamic range.

[0185] When APL R = 0 and APL B =0 or APL B = 0 and APL G The case where = 0 is similar to the above case and will not be described in detail here.

[0186] The specific procedures in the above three cases can be found in Fig.11 .

[0187] When the display device provided in the embodiment of the present application includes RGB three-color chips, the full white field brightness L is measured by a full white test chart. W , and then measure the brightness L of the pure red, pure green, and pure blue test charts respectively R , L G , L B , satisfying the condition L R +L G +L B ≥1.1*L W .

[0188] The display device and the control method of the display device provided in the embodiments of the present application can solve the color cast problem and improve the color dynamic range of the display device by determining the APL value of each light emitting channel.

[0189] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0190] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0191] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0192] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0193] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0194] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A display device, characterized in that: The display device comprises: A display panel, used for displaying images; A backlight module, used to provide a light source for the display panel; the backlight module includes at least two light-emitting chips emitting light of different wavelengths; A controller is electrically connected to the display panel and the backlight module, and the controller is configured as follows: Obtaining an average image level of each light-emitting channel in the backlight module; the light-emitting channel includes one or more light-emitting chips emitting light of the same wavelength; Determining a target average image level based on the average image levels of each light emitting channel; The average image level of the light-emitting channel to be adjusted is determined as the target average image level; the light-emitting channel to be adjusted is a light-emitting channel whose average image level is greater than a preset lower limit value.

2. The display device according to claim 1, characterized in that The controller is also configured to: Determining the gain of the target backlight brightness according to the target average image level and the preset gain curve corresponding to the light emitting channel to be adjusted; The gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the gain of the target backlight brightness.

3. The display device according to claim 2, characterized in that The controller is also configured to: Adjusting the gain of the target backlight brightness based on a preset adjustment coefficient; The gain of the backlight brightness of the light-emitting channel to be adjusted is determined as the gain of the target backlight brightness after adjustment; the gain of the target backlight brightness after adjustment is greater than the gain of the target backlight brightness before adjustment.

4. The display device according to claim 1, characterized in that The controller is also configured to: When the number of luminous channels whose average image levels are greater than the preset lower limit is three, the target average image level is determined to be the maximum value of the average image levels greater than the preset lower limit corresponding to the three luminous channels.

5. The display device according to claim 1, characterized in that The controller is also configured to: When the number of luminous channels whose average image levels are greater than the preset lower limit is two, the target average image level is determined to be the minimum value of the average image levels greater than the preset lower limit corresponding to the two luminous channels.

6. The display device according to claim 1, characterized in that The controller is also configured to: In a case where the number of light emitting channels whose average image level is greater than the preset lower limit value is one, the target average image level is determined to be an average image level greater than the preset lower limit value.

7. The display device according to claim 1, characterized in that The light emitting channels include three channels: RGB.

8. The display device according to claim 1, characterized in that The controller is also configured to: receiving an image signal, and determining backlight data of each of the light-emitting channels in the backlight module based on the image signal; According to the backlight data of each light emitting channel, an average image level of each light emitting channel is determined.

9. A method for controlling a display device, characterized in that: The display device comprises: A display panel, used for displaying images; A backlight module, used to provide a light source for the display panel; the backlight module includes at least two light-emitting chips emitting light of different wavelengths; A controller, electrically connected to the display panel and the backlight module; The method comprises: Obtaining an average image level of each light-emitting channel in the backlight module; the light-emitting channel includes one or more light-emitting chips emitting light of the same wavelength; Determining a target average image level based on the average image levels of each light emitting channel; The average image level of the light-emitting channel to be adjusted is determined as the target average image level; the light-emitting channel to be adjusted is a light-emitting channel whose average image level is greater than a preset lower limit value.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 9 are implemented.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to claim 9 are implemented.

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