CN112951168A - Display apparatus and backlight control method - Google Patents
Display apparatus and backlight control method Download PDFInfo
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- CN112951168A CN112951168A CN202110175271.0A CN202110175271A CN112951168A CN 112951168 A CN112951168 A CN 112951168A CN 202110175271 A CN202110175271 A CN 202110175271A CN 112951168 A CN112951168 A CN 112951168A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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Abstract
The embodiment of the application provides a display device and a backlight control method, relates to the technical field of display, and can eliminate the flicker phenomenon in the display device and improve user experience. The method comprises the following steps: predicting a first backlight partition and a second backlight partition according to the motion trail of the target image; the first backlight partition is a backlight partition where the target image is located in the current frame, and the second backlight partition is a backlight partition where the target image is located in the target frame; when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image; when the first image is a target frame, the target image or the partial image of the target image is positioned in the second backlight subarea; and adjusting the brightness of the second backlight subarea according to the backlight value of the second backlight subarea. The application is used for eliminating the flicker phenomenon of the display device.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display device and a backlight control method.
Background
Currently, some display devices such as liquid crystal televisions include a plurality of backlight partitions, and such display devices perform brightness compensation on a picture of a display through a Local Dimming technology. In the display device comprising a plurality of backlight partitions, each backlight partition can be independently controlled, so that the power consumption of the display device can be reduced, the contrast of a display picture of the display device can be improved, and the use experience of a user is improved.
With the development of the technology, the number of backlight partitions of the multi-partition display device is increased, and due to the fact that the number of partitions is large, the backlight area controlled by each partition is relatively small, when the display device is used for displaying pictures, the problem that pictures flicker exists in the display of certain motion scenes, and user experience is affected.
Disclosure of Invention
Embodiments of the present application provide a display device and a backlight control method, which can eliminate a flicker phenomenon in the display device and improve user experience.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, there is provided a display device comprising: a display and a controller.
Wherein the display is configured to: a user interface is displayed.
The controller is configured to:
predicting a first backlight partition and a second backlight partition according to the motion trail of the target image; the first backlight partition is a backlight partition where the target image is located in the current frame, and the second backlight partition is a backlight partition where the target image is located in the target frame;
when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image; when the first image is a target frame, the target image or the partial image of the target image is positioned in the second backlight subarea;
and adjusting the brightness of the second backlight subarea according to the backlight value of the second backlight subarea.
In a second aspect, a backlight control method is provided, which is applied to the display device provided in the first aspect, and includes:
predicting a first backlight partition and a second backlight partition according to the motion trail of the target image; the first backlight partition is a backlight partition where the target image is located in the current frame, and the second backlight partition is a backlight partition where the target image is located in the target frame;
when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image; when the first image is a target frame, the target image or the partial image of the target image is positioned in the second backlight subarea;
and adjusting the brightness of the second backlight subarea according to the backlight value of the second backlight subarea.
In a third aspect, there is provided a display device comprising:
and a display for displaying a screen.
A controller configured to:
when the display is controlled to display the current frame picture, the backlight value corresponding to the target frame is used as the backlight value of the current frame picture for backlight adjustment, and the target frame is a P frame picture behind the current frame picture.
According to the display device provided by the embodiment of the application, the backlight subarea to which the target image is possibly moved is predicted through the motion trail of the target image displayed in the display, such as the second backlight subarea; when the target image is predicted to move from a first backlight partition where the current frame is located to a second backlight partition through the motion track, determining the brightness difference between the first backlight partition and the second backlight partition; if the brightness difference value is larger than the set value, the flicker phenomenon possibly occurring when the target image moves to the second backlight subarea can be determined, at the moment, the display equipment can predict a first image of the target image moving to the second backlight subarea through the controller, and the backlight value of the second backlight subarea is determined according to the first gray scale distribution condition of the first image; at this time, the target image does not actually move to the second backlight partition, and the backlight value of the second backlight partition determined by the controller is obtained by pre-calculation, so that the brightness of the second backlight partition can be adjusted in advance according to the backlight value, thereby avoiding the flicker phenomenon caused by the delay of the brightness change of the second backlight partition from the change of the target image, and improving the use experience of users.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an operation scenario between a display device and a control apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating an example of a display device having a flicker phenomenon according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a backlight control method according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a backlight partition of a display device according to an embodiment of the present disclosure;
fig. 5(a) is a schematic diagram of a currently occupied backlight partition of a target image according to an embodiment of the present disclosure;
FIG. 5(b) is a schematic diagram of a backlight partition occupied by a target image according to an embodiment of the present application;
FIG. 5(c) is a schematic diagram of another backlight partition occupied by target image prediction according to an embodiment of the present application;
fig. 6 is a schematic diagram illustrating a division of a target image according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another backlight partition occupied by target image prediction according to an embodiment of the present application;
fig. 8 is a second flowchart illustrating a backlight control method according to a second embodiment of the present disclosure;
fig. 9 is a gray level histogram of a first image according to an embodiment of the present disclosure;
fig. 10 is a third schematic flowchart of a backlight control method according to an embodiment of the present application;
fig. 11 is a fourth flowchart illustrating a backlight control method according to an embodiment of the present disclosure.
Detailed Description
To make the objects, embodiments and advantages of the present application clearer, the following description of exemplary embodiments of the present application will clearly and completely describe the exemplary embodiments of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application, and it is to be understood that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments described herein without inventive step, are intended to be within the scope of the claims appended hereto. In addition, while the disclosure herein has been presented in terms of one or more exemplary examples, it should be appreciated that aspects of the disclosure may be implemented solely as a complete embodiment.
It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and are not necessarily intended to limit the order or sequence of any particular one, Unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
The term "module," as used herein, 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 functionality associated with that element.
The term "remote control" as used in this application refers to a component of an electronic device (such as the display device disclosed in this application) that is typically wirelessly controllable over a relatively short range of distances. Generally, an infrared and/or Radio Frequency (RF) signal and/or bluetooth is used to connect with the electronic device, and may also include functional modules such as WiFi, wireless Universal Serial Bus (USB), bluetooth, and motion sensor. For example: the hand-held touch remote controller replaces most of the physical built-in hard keys in the common remote control device with the user interface in the touch screen.
Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control apparatus according to an embodiment. As shown in fig. 1, a user may operate the display device 200 through the mobile terminal 300 and the control apparatus 100.
In some embodiments, the control apparatus 100 may be a remote controller, and the communication between the remote controller and the display device 200 includes an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, etc., and the display device 200 is controlled by wireless or other wired methods. The user may input a user instruction through a key on a remote controller, voice input, control panel input, etc. to control the display apparatus 200. Such as: the user may input a corresponding control command through a volume up/down key, a channel control key, up/down/left/right movement keys, a voice input key, a menu key, a power on/off key, etc. on the remote controller, to implement a function of controlling the display device 200.
In some embodiments, mobile terminals, tablets, computers, laptops, and other smart devices may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device. The application program can provide various controls for a user in an intuitive User Interface (UI) on a screen associated with the smart device through configuration.
In some embodiments, the mobile terminal 300 may install a software application with the display device 200 to implement connection communication through a network communication protocol for the purpose of one-to-one control operation and data communication. Such as: the control instruction protocol can be established between the mobile terminal 300 and the display device 200, the remote control keyboard is synchronized to the mobile terminal 300, and the function of controlling the display device 200 is realized by controlling the user interface on the mobile terminal 300; the audio and video content displayed on the mobile terminal 300 may also be transmitted to the display device 200, so as to implement a synchronous display function.
As also shown in fig. 1, the display apparatus 200 also performs data communication with the server 400 through various communication means. The display apparatus 200 may be allowed to make a communication connection through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. Illustratively, the display device 200 receives software program updates, or accesses a remotely stored digital media library by sending and receiving information, and Electronic Program Guide (EPG) interactions. The server 400 may be a cluster or a plurality of clusters, and may include one or more types of servers. Other web service contents such as video on demand and advertisement services are provided through the server 400.
The display device 200 may be a liquid crystal display, an organic light-emitting diode (OLED) display, or a projection display device. The specific display device type, size, resolution, etc. are not limiting, and those skilled in the art will appreciate that the display device 200 may be modified in performance and configuration as desired.
The display apparatus 200 may additionally provide an intelligent network tv function providing a computer support function in addition to the broadcast receiving tv function, including but not limited to a network tv, an intelligent tv, an Internet Protocol Tv (IPTV), and the like.
In the related art, in order to improve the display quality, the display layering and the contrast of the picture of the display device, the backlight source generally adopts a dynamic backlight control method. The specific implementation process is that the backlight module of the backlight source is divided into a plurality of backlight subareas, and the brightness of each backlight subarea is controlled according to the image information of each backlight subarea.
When the multi-partition display equipment is used for displaying, when the image brightness corresponding to the backlight partition changes, the backlight of the backlight partition also changes, but the backlight action has 2-3 frame delay due to the time required from the image brightness change to the backlight action. With the development of the technology, the number of backlight partitions of the multi-partition display device is more and more, and particularly when sub-millimeter level leds (mini leds) are used as backlight sources, the backlight product can realize ultra-multi-partition fine control, and in the display device, halos are highly converged.
Because the number of the backlight partitions is large and the backlight area controlled by each backlight partition is relatively small, when the display device is used for displaying a picture, when the gray scales of the image contents between the adjacent blocks in the picture are obviously different and the positions of the two adjacent blocks are continuously changed (namely, the image in one backlight partition enters the other backlight partition), the adjacent areas can have a flicker phenomenon caused by a large delay and a large brightness change range. Specifically, when a moving picture, for example, a white small ball shown in fig. 2, is displayed to move back and forth under a black background, especially a scene with a large gray scale difference between a moving object and the background. For example: when a black-white crossed object moves in a picture and the boundary where the moving object is located between different backlight partitions, namely when a white picture and a black background move at the boundary of two adjacent backlight partitions, a white picture image is lightened firstly, but the backlight of the black background is still displayed due to time delay, namely the image brightness corresponding to the backlight partition is higher, and the brightness of the backlight partition is darker, so that the subjective feeling of flickering of the boundary area is caused. In practical application, there are a lot of scenes with black and white cross motion, and the problem of picture flicker exists.
When the image moves in the display and is located in different partitions, the backlight of the corresponding backlight partition changes due to the continuous change of the gray scale between the different partitions. Due to the fact that a certain time delay exists between the backlight of the backlight partition and the gray scale change of the image, when the image moves among different backlight partitions, the image may brighten first, and the backlight of the corresponding backlight partition brightens after being delayed for a certain time, so that a flickering phenomenon among different partitions is caused, and user experience is affected.
In order to solve the flicker phenomenon of the display device, an embodiment of the present application provides a backlight control method, which controls the backlight of the target backlight partition in advance by predicting an image motion trajectory in a display and combining with a gray-scale partition condition of an image, so that the luminance of the target backlight partition is adapted to the luminance of the image, thereby avoiding the flicker phenomenon caused by the backlight change time delay of the target backlight partition, and improving the experience of users. The target backlight partition herein refers to a backlight partition to which an image is to be moved from the current backlight partition.
The backlight control method is suitable for the display equipment to display the motion scene pictures, because the flicker phenomenon of the display equipment can be obviously perceived by a user when the display equipment displays certain motion scene pictures. Therefore, before implementing the flow of the backlight control method provided by this embodiment, the display device further needs to determine whether the image displayed in the display device is a moving image, and after determining that the image displayed in the display device is a moving image, the backlight control method provided by this embodiment can eliminate the possible flicker phenomenon. Here, the moving image in the display device may be determined according to a moving object detection algorithm, or may be determined according to another algorithm, which is not limited in this embodiment.
The backlight control method provided by the embodiment of the application is applied to display equipment, and the display equipment comprises a display and a controller. Wherein the display is configured to: a user interface is displayed. As shown in fig. 3, the controller is configured to perform the steps of:
s101, predicting a first backlight partition and a second backlight partition according to the motion trail of the target image.
The first backlight partition is a backlight partition where the target image is located in the current frame, the second backlight partition is a backlight partition where the target image is located in the target frame, and the second backlight partition is adjacent to the first backlight partition. The target frame may be a next frame of the current frame, or may be another frame after the current frame, such as a third frame after the current frame.
Specifically, the display device in the embodiment of the present application may be a terminal device such as a smart television and a smart phone, for example, the display device in the present application may be the display device 200 shown in fig. 1. According to different display devices, the backlight module of the display backlight source can be divided into a plurality of backlight partitions, and the backlight values of the backlight partitions are dynamically controlled to reduce the energy consumption of the display devices. For example, when the display device is a 45-inch smart television, the number of backlight partitions can be 100; when the display device is a 65-inch intelligent television, the number of backlight partitions can be 200; of course, when the display device is a smart phone, the backlight partition may also be divided into different numbers of backlight partitions according to the screen size.
When a target image is displayed in a display of a display device, the target image may be static or may be dynamically moving; when the target image moves dynamically, the controller may predict a backlight partition, i.e., a second backlight partition, which the target image may reach according to the motion trajectory of the target image. When the target image moves, it may move out of the first backlight partition completely in the target frame, or only part of the image may move out of the first backlight partition, so that the backlight partition in which the target image is located in the target frame may include not only the second backlight partition but also the first backlight partition.
Illustratively, as shown in fig. 4, a schematic diagram of backlight partitions of a display device is provided, and a target image may occupy any one backlight partition or a plurality of backlight partitions. As shown in fig. 5(a), a schematic diagram of the backlight partition occupied by the target image in the current frame is provided, where the backlight partitions occupied by the target image are all the first backlight partitions, and the first backlight partition is not limited to only one backlight partition. For example, the first backlight partition may include a first backlight partition 1, a first backlight partition 2, a first backlight partition 3, and a first backlight partition 4; of course, the number of the first backlight partitions occupied by the target image may be more in practice.
As shown in fig. 5(b), a schematic diagram of predicted backlight partitions of a target image is provided, where the diagram is used to instruct a controller to predict, according to a motion trajectory of the target image, backlight partitions that may be occupied by the target image due to dynamic motion, where the backlight partitions occupied by the target image may include a first backlight partition and a second backlight partition. For example, the backlight partition occupied by the target image at this time may include a first backlight partition 1, a first backlight partition 2, a first backlight partition 3, a first backlight partition 4, a second backlight partition 1, and a second backlight partition 2. The first target image in fig. 5(b) is the current position of the target image, and the second target image is the possible position of the target image predicted according to the motion trajectory of the target image.
In some embodiments, when the target image is in dynamic motion, the motion range of the target image may be only within the first backlight partition, as shown in fig. 5(c), and a diagram of the predicted backlight partition of the target image is also provided, in which the target image still only occupies the first backlight partition and does not occupy the second backlight partition. The first target image in fig. 5(c) is the current position of the target image, the second target image is the possible position of the target image predicted according to the motion track of the target image, and the target image occupies the first backlight partition 1, the first backlight partition 2, the first backlight partition 3 and the first backlight partition 4 before and after the motion, but does not occupy a new second backlight partition.
It should be noted that the display device in the present application refers to a multi-partition display device. In this embodiment, the first backlight partition still occupied after the target image is moved may also be referred to as a second backlight partition, and if the target image occupies the first backlight partition 1 before the target image is moved and still occupies the first backlight partition 1 after the target image is moved, the first backlight partition 1 may also be referred to as a second backlight partition herein; if the target image occupies the first backlight partition 1, the first backlight partition 2, the first backlight partition 3, and the first backlight partition 4 before the target image moves, and still occupies the first backlight partition 1, the first backlight partition 2, the first backlight partition 3, and the first backlight partition 4 after the target image moves, the first backlight partition 1, the first backlight partition 2, the first backlight partition 3, and the first backlight partition 4 may also be referred to as a second backlight partition 1, a second backlight partition 2, a second backlight partition 3, and a second backlight partition 4, respectively.
S102, when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is larger than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image.
And when the first image is the target frame, the target image or the partial image of the target image in the second backlight subarea is positioned.
Specifically, the setting value here may be determined by a person skilled in the art through experiments that when the luminance difference value between the first backlight partition and the second backlight partition is greater than or equal to the setting value, a flicker phenomenon may exist in the motion of the target image between the two backlight partitions.
Since the first backlight partition and the second backlight partition may each include a plurality of partitions, it is necessary to determine the luminance difference values between the first backlight partition and the corresponding second backlight partition when determining the luminance difference values between the first backlight partition and the second backlight partition. It should be noted that, here, there is a corresponding relationship between the first backlight partition and the second backlight partition, and if the first backlight partition 1 is adjacent to the second backlight partition 1 and the target image moves from the first backlight partition 1 to the second backlight partition 1, it may be determined that the first backlight partition 1 corresponds to the second backlight partition 1; if the second backlight partition 2 is not adjacent to the first backlight partition 1 but adjacent to the first backlight partition 2 and the target image moves from the first backlight partition 2 to the second backlight partition 2, it may be determined that the first backlight partition 2 corresponds to the second backlight partition 2.
For example, if the target image is located in the first backlight partition when the target image is in the current frame and located in the second backlight partition when the target image is in the target frame, if the difference between the luminance of the second backlight partition and the luminance of the first backlight partition is greater than or equal to the set value, a flicker phenomenon may occur when the target image moves to the second backlight partition; at this time, the backlight value of the second backlight partition in the target frame needs to be determined according to the target image, so as to adjust the brightness of the second backlight partition in advance, thereby avoiding the flicker phenomenon.
In some embodiments, after determining that the difference between the brightness of the first backlight partition in the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to the set value, the backlight value of the second backlight partition is determined according to the picture information of the display picture corresponding to the partition.
The backlight value of the second backlight partition may specifically be determined by the following steps:
and determining the backlight value of the second backlight subarea in the target frame according to the first gray scale distribution condition of the first image.
Wherein the first gray scale distribution condition is used for indicating the number of each gray scale pixel in the first image.
Specifically, after determining that the luminance difference between the first backlight partition and the second backlight partition corresponding to the first backlight partition is greater than or equal to the set value, the backlight value of the second backlight partition may be determined according to the first gray scale distribution condition of the first image. For example, fig. 5(b) shows a schematic diagram of a predicted backlight partition of the target image determined according to the motion trajectory of the target image, as shown in fig. 6, the target image may be divided into a first image and a second image, where the first image is an image occupying the second backlight partition. Here, the brightness of the first backlight partition and the brightness of the second backlight partition may be determined by the controller through a control module of the backlight source.
In some embodiments, when the target image moves out of the first backlight partition completely, the first image may also be the target image, as shown in fig. 7, when the target image moves from the first backlight partition to the second backlight partition completely, the first image is the target image, and the first image is the second target image in fig. 7. The first target image in fig. 7 is the current position of the target image, and the second target image is the possible position of the target image predicted according to the motion trajectory of the target image.
After the first image is determined, the backlight value of the second backlight partition can be calculated according to the first gray scale distribution condition corresponding to the first image, so that the backlight brightness of the second backlight partition can be adjusted in advance according to the backlight value, the time delay during the adjustment of the brightness of the second backlight partition is avoided, and the flicker phenomenon is avoided. The first gray scale distribution here refers to the number of pixels in each gray scale in the first image, and for example, the first image includes 90 pixels with a gray scale of 233, 80 pixels with a gray scale of 165, 70 pixels with a gray scale of 50, and so on.
In some embodiments, as shown in fig. 5(c), when the target image moves inside the first backlight partitions, since the image portions of the target image in the respective first backlight partitions change, the gray scales of the pixels included in the respective first backlight partitions also change, and therefore, the backlight values of the respective first backlight partitions also need to be adjusted. At this time, it is necessary to determine the gray level histogram of each first backlight partition, and count the number of pixels of each gray level, so as to determine the backlight value of each first backlight partition.
In some embodiments, when the luminance difference between the first backlight partition and the second backlight partition is smaller than the set value, the movement of the target image between the two backlight partitions does not cause a flicker phenomenon, but the backlight values of the first backlight partition and the second backlight partition still need to be adjusted to enhance the contrast between the target image and the first backlight partition and the second backlight partition, thereby enhancing the user's impression.
In some embodiments, when the difference between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to the set value, as shown in fig. 8, step S102 may include:
and S1021, determining a first gray level histogram of the first image.
And S1022, determining a first gray distribution condition of the first image according to the first gray histogram.
Specifically, the first gray scale distribution condition may be determined according to a gray scale histogram of the first image, and the number of each gray scale pixel may be determined by performing statistics on the gray scale histogram of the first image. The gray level histogram of the first image may be determined by the controller according to the prior art, for example, the controller may determine the gray level histogram of the first image through OpenCV, or may determine the gray level histogram of the first image through other technical means commonly used in the art, which is not described herein again.
For example, a gray histogram of the first image may be as shown in fig. 9, where the horizontal axis represents the gray level of the pixel and the vertical axis represents the corresponding number of pixels. The number of pixels in each gray level can be determined by statistics of the gray level histogram, for example, the number of pixels with the gray level of 233 is 90, the number of pixels with the gray level of 165 is 80, the number of pixels with the gray level of 50 is 70, and the like.
In some embodiments, the first gray scale distribution condition may also be determined by other methods, for example, determining the gray scale of the corresponding pixel according to the RGB color components of each pixel in the second backlight partition, and further determining the number of each gray scale pixel.
And S1023, determining the backlight value of the second backlight partition in the target frame according to the first gray scale distribution condition.
Specifically, steps S1021 to S1022 may determine a first gray distribution of the first image, that is, the number of pixels in each gray level, through a gray histogram of the first image, where a maximum gray value of a pixel in the first image may be determined as a backlight value of the second backlight partition, or N times a gray average value of the pixel of the first image may be determined as the backlight value of the second backlight partition; of course, the backlight value of the second backlight partition may also be determined by weighting according to the maximum gray scale value and the average gray scale value, which is not limited in this embodiment of the present application.
In some embodiments, a person skilled in the art may also determine the backlight value of the second backlight partition by using other backlight dynamic dimming algorithms, which is not described in detail herein.
In some embodiments, the second backlight partition may include a plurality of second backlight partitions 1 and 2, for example, as shown in fig. 5(b), and thus the first image may also include a plurality of first images 1 located in the second backlight partition 1 and 2 located in the second backlight partition 2. Therefore, the gray scale distribution conditions of the first image 1 and the first image 2 need to be determined, and the backlight value of the corresponding second backlight partition is determined according to the gray scale distribution conditions, for example, the backlight value of the second backlight partition 1 is determined according to the gray scale distribution condition of the first image 1, and the backlight value of the second backlight partition 2 is determined according to the gray scale distribution condition of the first image 2, and the specific process may refer to step S1023, which is not described herein again.
And S103, adjusting the brightness of the second backlight partition according to the backlight value of the second backlight partition.
Specifically, after determining the backlight value of the second backlight partition, the controller may adjust the brightness of the second backlight partition according to the backlight value. It should be noted that, since the flicker phenomenon of the display device is caused by a certain time delay in the process of controlling the second backlight partition to adjust the brightness thereof according to the corresponding backlight value by the controller, the backlight value adjustment of the second backlight partition by the controller is performed in advance, and at this time, the target image has not moved to the second backlight partition.
For example, if the controller controls the second backlight partition to adjust the time delay of the brightness thereof to three frames according to the corresponding backlight value, the target frame is the third frame after the current frame. At this time, second backlight partitions occupied by the target image in the target frame and backlight values corresponding to the second backlight partitions in the target frame can be determined according to the above embodiment; since the second backlight partition has a time delay when adjusting the brightness thereof according to the corresponding backlight value, the brightness of the second backlight partition can be adjusted according to the backlight value after the backlight value of the second backlight partition in the target frame is determined, that is, the target frame starts to adjust the brightness of the second backlight partition according to the backlight value; therefore, when the target image moves to the second backlight subareas where the target frame is located, the brightness of the second backlight subareas is matched with the gray scale of the corresponding image, and the flicker phenomenon is avoided.
In some embodiments, since the second backlight partition may include a plurality of second backlight partitions, and the backlight values corresponding to the second backlight partitions may be different, the brightness of the second backlight partition needs to be adjusted according to the backlight values corresponding to the second backlight partitions. For example, if step S1023 determines that the backlight value of the second backlight partition 1 is the first backlight value 1 and the backlight value of the second backlight partition 2 is the first backlight value 2, it is necessary to adjust the luminance of the second backlight partition 1 according to the first backlight value 1 and adjust the luminance of the second backlight partition 2 according to the first backlight value 2.
In some embodiments, as shown in fig. 10, before step S101, the controller is further configured to perform the following steps:
s201, determining a motion track according to a frame picture of the target image in the target time period.
Specifically, the motion trajectory of the target image may be determined according to technical means customary in the art, for example, may be determined by combining a machine learning model with a frame picture of the target image in the target time period, where the machine learning model may be a trained motion trajectory prediction model, and may predict a possible motion trajectory of the target image according to the frame picture. For example, the motion trajectory prediction model may collect M frames of pictures of the target image in the target time period, and predict the motion trajectory of the next frame according to the variation trend of the M frames of pictures. The target period may be M frames of target image motion prior to the current frame.
Of course, a person skilled in the art may also determine the motion trajectory of the target image by other methods, and further determine whether the target image is likely to move from the first backlight partition to the second backlight partition.
In some embodiments, the machine learning model may be a neural network model, or may be another model, which is not limited to this embodiment.
In some embodiments, as shown in fig. 11, the controller is further configured to perform the steps of:
and S301, according to a second gray level histogram of the second image.
And when the second image is the target frame, the second image is located in the target image or the partial image of the target image of the first backlight subarea.
And S302, determining a second gray degree distribution condition of the second image according to the second gray degree histogram.
Wherein the second gray scale distribution indicates the number of gray scale pixels in the second image.
Specifically, the second image is a partial image that is still located in the first backlight partition after the target image moves, which is predicted according to the motion trajectory of the target image. For example, the second image may be as shown in fig. 6, which is only a partial image of the target image; the second image may also be as shown in fig. 5(c), where the second image is the target image.
Similarly, the second gray-scale distribution of the second image may be determined according to the corresponding gray-scale histogram, and the number of each gray-scale pixel in the second image may be determined by performing statistics on the gray-scale histogram of the second image. The gray level histogram of the second image can be obtained according to the above method, and will not be described herein again.
And S303, determining the backlight value of the first backlight partition in the target frame according to the second gray scale distribution condition.
Specifically, steps S301 to S302 may determine a second gray-scale distribution of the second image in the target frame, i.e. the number of pixels in each gray-scale level in the second image, through the gray-scale histogram of the second image. Similarly, here, the maximum value of the gray scale of the pixel in the second image may be determined as the backlight value of the first backlight partition in the target frame, or N times the average value of the gray scale of the pixel in the second image may be determined as the backlight value of the first backlight partition in the target frame; of course, weighting may be performed according to the maximum gray scale value and the average gray scale value to determine the backlight value of the first backlight partition in the target frame, which is not limited in this embodiment of the application.
In some embodiments, a person skilled in the art may also determine the backlight value of the first backlight partition by using other backlight dynamic dimming algorithms, which is not described in detail herein.
In some embodiments, the first backlight partition may include a plurality of, for example, as shown in fig. 5(b), the first backlight partition includes a first backlight partition 1, a first backlight partition 2, a first backlight partition 3, and a first backlight partition 4, and thus the second image herein may also include a plurality of, i.e., a second image 1 located in the first backlight partition 1, a second image 2 located in the first backlight partition 2, a second image 3 located in the first backlight partition 3, and a second image 4 located in the first backlight partition 4. Therefore, it is necessary to determine the gray scale distribution conditions of the second image 1, the second image 2, the second image 3, and the second image 4, and determine the backlight value of the corresponding first backlight partition according to the gray scale distribution conditions, for example, determine the backlight value of the first backlight partition 1 according to the gray scale distribution condition of the second image 1, determine the backlight value of the first backlight partition 2 according to the gray scale distribution condition of the second image 2, and the like, and the specific process may refer to step S303 described above, which is not described herein again.
S304, adjusting the brightness of the first backlight partition according to the backlight value of the first backlight partition.
Specifically, after determining the backlight value of the first backlight partition, the controller may adjust the brightness of the first backlight partition in advance according to the backlight value, and the specific process may refer to an adjustment method of the second backlight partition, which is not described herein again. It should be noted that, although the target image is not moving, since there is a time delay when the first backlight partition adjusts its brightness according to the corresponding backlight value, the controller may adjust its brightness according to the corresponding backlight value in advance.
In some embodiments, since the first backlight partition may include a plurality of first backlight partitions, and the backlight values corresponding to the first backlight partitions may be different, the brightness of the first backlight partition needs to be adjusted according to the backlight values corresponding to the first backlight partitions. For example, if step S303 determines that the backlight value of the first backlight partition 1 is the second backlight value 1 and the backlight value of the first backlight partition 2 is the second backlight value 2, it is necessary to adjust the brightness of the second backlight partition 1 according to the second backlight value 1 and adjust the brightness of the second backlight partition 2 according to the second backlight value 2.
The embodiment not only adjusts the backlight value of the second backlight partition in advance to avoid the flicker phenomenon of the second backlight partition, but also adjusts the backlight value of the first backlight partition in advance to avoid the flicker phenomenon possibly caused by the movement of the image in the first backlight partition.
The backlight control method provided by the embodiment of the application can predict the backlight subarea to which the target image possibly moves according to the motion track of the target image in the display, and when the target image is predicted to move to the second backlight subarea from the first backlight subarea where the target image is located at present through the motion track, the brightness difference value between the first backlight subarea and the second backlight subarea is determined; if the brightness difference value is larger than the set value, the flicker phenomenon possibly occurring when the target image moves to the second backlight subarea can be determined, at the moment, the display equipment can predict a first image of the target image moving to the second backlight subarea through the controller, and the backlight value of the second backlight subarea is determined according to the first gray scale distribution condition of the first image; at this time, the target image does not actually move to the second backlight partition, and the backlight value of the second backlight partition determined by the controller is obtained by pre-calculation, so that the brightness of the second backlight partition can be adjusted in advance according to the backlight value, and the flicker phenomenon caused by the fact that the brightness change of the second backlight partition is delayed from the change of the target image is avoided, and the use experience of a user is improved.
The embodiment of the application provides a display device, which is used for executing the method flow executed by the controller so as to avoid the flicker phenomenon when an image moves in the display device. The display device includes a display and a controller.
Wherein the display is configured to: a user interface is displayed.
The controller is configured to: predicting a first backlight partition and a second backlight partition according to the motion trail of the target image; the first backlight partition is a backlight partition where the target image is located in the current frame, and the second backlight partition is a backlight partition where the target image is located in the target frame; when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image; when the first image is a target frame, the target image or the partial image of the target image is positioned in the second backlight subarea; and adjusting the brightness of the second backlight subarea according to the backlight value of the second backlight subarea.
In some embodiments, the controller is further configured to: and determining a motion track according to the frame picture of the target image in the target time period.
In some embodiments, the controller is specifically configured to: determining a backlight value of a second backlight partition in the target frame according to the first gray scale distribution condition of the first image; the first gray scale distribution indicates the number of individual gray scale pixels in the first image.
In some embodiments, the controller is specifically configured to: determining a first gray level histogram of a first image; determining a first gray distribution condition of the first image according to the first gray histogram; and determining the backlight value of the second backlight subarea in the target frame according to the first gray distribution condition.
In some embodiments, the controller is further specifically configured to: a second gray level histogram from the second image; the second image is a target image or a partial image of the target frame in the first backlight subarea; determining a second gray degree distribution condition of the second image according to the second gray degree histogram; the second gray scale distribution condition is used for indicating the number of each gray scale pixel in the second image; determining the backlight value of the first backlight partition in the target frame according to the second gray scale distribution condition; and adjusting the brightness of the first backlight subarea according to the backlight value of the first backlight subarea.
The embodiment of the application further provides a display device, which is used for adjusting the brightness of the target image occupying the backlight partition in the target frame in advance through the embodiment to avoid the flicker phenomenon. The display device includes a display and a controller.
The display is used for displaying pictures;
a controller configured to:
when the display is controlled to display the current frame picture, the backlight value corresponding to the target frame is used as the backlight value of the current frame picture for backlight adjustment, and the target frame is a P frame picture behind the current frame picture.
Wherein P is less than or equal to 3. Of course, the time delay of the brightness adjustment according to the backlight partition, where P may be other values.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.
Claims (11)
1. A display device, comprising:
a display;
a controller configured to:
predicting a first backlight partition and a second backlight partition according to the motion trail of the target image; the first backlight partition is a backlight partition where the target image is located in the current frame, and the second backlight partition is a backlight partition where the target image is located in the target frame;
when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image; when the first image is the target frame, the target image or the partial image of the target image in the second backlight subarea is located;
and adjusting the brightness of the second backlight subarea according to the backlight value of the second backlight subarea.
2. The display device of claim 1, wherein the controller is further configured to: and determining the motion trail according to the frame picture of the target image in the target time period.
3. The display device of claim 2, wherein the controller is specifically configured to: determining the backlight value of the second backlight partition in the target frame according to the first gray scale distribution condition of the first image; the first gray scale distribution is used for indicating the number of each gray scale pixel in the first image.
4. The display device of claim 3, wherein the controller is specifically configured to:
determining a first grayscale histogram of the first image;
determining a first gray distribution condition of the first image according to the first gray histogram;
and determining the backlight value of the second backlight subarea in the target frame according to the first gray scale distribution condition.
5. The display device of claim 4, wherein the controller is further specifically configured to:
a second gray level histogram from the second image; when the second image is the target frame, the second image is the target image or a partial image of the target image in the first backlight subarea;
determining a second gray degree distribution condition of the second image according to the second gray degree histogram; the second gray scale distribution condition is used for indicating the number of each gray scale pixel in the second image;
and determining the backlight value of the first backlight partition in the target frame according to the second gray scale distribution condition.
6. The display device of claim 5, wherein the controller is further configured to: and adjusting the brightness of the first backlight partition according to the backlight value of the first backlight partition.
7. A backlight control method is applied to a display device, and comprises the following steps:
predicting a first backlight partition and a second backlight partition according to the motion trail of the target image; the first backlight partition is a backlight partition where the target image is located in the current frame, and the second backlight partition is a backlight partition where the target image is located in the target frame;
when the difference value between the brightness of the current frame and the brightness of the second backlight partition in the target frame is greater than or equal to a set value, the first backlight partition determines the backlight value of the second backlight partition according to the first image; when the first image is the target frame, the target image or the partial image of the target image in the second backlight subarea is located;
and adjusting the brightness of the second backlight subarea according to the backlight value of the second backlight subarea.
8. The backlight control method according to claim 7, wherein before predicting the first backlight partition and the second backlight partition according to the motion trajectory of the target image, the method further comprises: and determining the motion trail according to the frame picture of the target image in the target time period.
9. The backlight control method according to claim 8, wherein the determining the backlight value of the second backlight partition in the target frame according to the first gray-scale distribution condition of the first image comprises:
determining the backlight value of the second backlight subarea according to the first gray scale distribution condition of the first image; the first gray scale distribution is used for indicating the number of each gray scale pixel in the first image.
10. The backlight control method of claim 9, wherein the determining the backlight value of the second backlight partition according to the first gray-scale distribution of the first image comprises:
determining a first grayscale histogram of the first image;
determining a first gray distribution condition of the first image according to the first gray histogram;
and determining the backlight value of the second backlight subarea in the target frame according to the first gray scale distribution condition.
11. A display device, comprising:
a display for displaying a screen;
a controller configured to:
when the display is controlled to display a current frame picture, a backlight value corresponding to a target frame is used as the backlight value of the current frame picture for backlight adjustment, and the target frame is a P frame picture behind the current frame picture.
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| PCT/CN2021/119693 WO2022170765A1 (en) | 2021-02-09 | 2021-09-22 | Display device and backlight control method |
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