Display device and backlight control method thereof

Abstract

The invention provides a display device and a backlight control method thereof, and the display device comprises a backlight assembly which comprises at least one driving chip and at least one lamp bead, the at least one lamp bead forms a light-emitting unit, the driving chip comprises at least one channel, and the channel corresponds to the light-emitting unit; the controller is coupled with the backlight assembly and is configured to generate driving data for driving a current frame of a channel in the chip based on the image data; wherein the driving data of the channel comprises a plurality of data segments; the driving chip is configured to control the current of the light emitting unit corresponding to a channel aiming at the channel of the driving chip based on the data segments in the driving data of the channel, and the current under at least two data segments in the plurality of data segments is different and is not zero. The display effect can be improved by adjusting backlight.

Description

Technical Field

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

[0002] A display device is a device that displays images and provides a user interface. It typically includes at least one controller, a driver circuit, and multiple light strings for backlighting. The driver circuit includes at least one driver chip, which contains at least one channel.

[0003] In related technologies, based on Black Frame Insertion (BFI), a black frame data segment is set in the channel driving data. For each frame, the driver chip turns off the backlight based on the black frame segment, and drives the corresponding light string to emit light at a constant operating current based on the driving data in other periods.

[0004] However, the display effect of the display device in the above technology is not good. Improving the display effect by adjusting the backlight has become a hot topic in current research. Summary of the Invention

[0005] The present application provides a display device and a backlight control method thereof, aiming to improve the display effect by adjusting the backlight.

[0006] In a first aspect, the present application provides a display device, comprising: a backlight assembly, comprising at least one driver chip and at least one lamp bead, wherein the at least one lamp bead constitutes a light-emitting unit, the driver chip comprising at least one channel, and the channel corresponding to the light-emitting unit; a controller coupled to the backlight assembly, configured to: generate driving data of a current frame of a channel in the driver chip based on image data; wherein the driving data of the channel comprises multiple data segments; the driver chip is configured to: for the channel of the driver chip, based on the data segments in the driving data of the channel, control the current of the light-emitting unit corresponding to the channel, wherein the currents under at least two of the multiple data segments are different and non-zero.

[0007] In some embodiments, the plurality of data segments include a working data segment and at least one compensation data segment, and a current in at least one compensation data segment is different from a current in the working data segment.

[0008] In some embodiments, the data segments corresponding to non-zero currents in the plurality of data segments are continuous.

[0009] In some embodiments, the image data includes the equivalent grayscale of the pixel unit of the current frame; the at least one compensation data segment includes at least one first compensation data segment; for the light-emitting unit, if the equivalent grayscale of the current frame of the corresponding pixel unit is higher than the equivalent grayscale of the previous frame of the pixel unit, then the first compensation current under the first compensation data segment is greater than the operating current; if the equivalent grayscale of the current frame of the corresponding pixel unit is lower than the equivalent grayscale of the previous frame of the pixel unit, then the first compensation current under the first compensation data segment is less than the operating current.

[0010] In some embodiments, the at least one compensation data segment includes at least one second compensation data segment; the working current under the working data segment is greater than the second compensation current under the second compensation data segment, and the second compensation current is less than the first threshold; the second compensation current is not zero; at least one row or column of lamp beads constitutes a light-emitting group, and the lamp beads in the same light-emitting group are scanned simultaneously; the lamp beads in the same light-emitting unit are located in the same light-emitting group; the sum of the duration of the second compensation current and the duration of other non-zero currents is not less than the scanning duration; the scanning duration is the ratio of the display period to the number of light-emitting groups.

[0011] In some embodiments, the controller is configured to determine the lengths of the working data segment and the compensation data segment based on a frame of image data; wherein the length of a data segment corresponds to the duration of the current under the data segment.

[0012] In some embodiments, the first compensation data segment is continuous with the working data segment; the display device further includes a display panel, the display panel including at least one liquid crystal molecule; the liquid crystal molecule corresponds to the light-emitting unit; the display panel is configured to: control the flipping of the liquid crystal molecules based on the display data; the driving chip is configured to: drive the light-emitting unit to emit light based on the first compensation current under the first compensation data segment before the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel finish flipping and / or start flipping; the duration of the first compensation current is less than the duration of the flipping of the liquid crystal molecules corresponding to the light-emitting unit.

[0013] In some embodiments, for the light-emitting unit, if the equivalent grayscale of the current frame of the corresponding pixel unit is higher than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the multiple first compensation data segments decreases in the direction away from the working current; if the equivalent grayscale of the current frame of the corresponding pixel unit is lower than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the multiple first compensation data segments increases in the direction away from the working current.

[0014] In some embodiments, the controller is configured to: for the data segments of the channel, determine the information of the data segments from the equivalent grayscale of the previous frame to the current equivalent grayscale based on the first correspondence between the first grayscale to the second grayscale and the information of the data segments; the information of the data segments includes the length of the data segments; the first correspondence between the multiple data segments is not exactly the same.

[0015] In some embodiments, the controller includes a first controller and at least one second controller coupled to the first controller; the second controller corresponds to the driver chip, and the second controller stores the first correspondence; the first controller is configured to: for the channel, obtain the corresponding equivalent grayscale of the current frame and the equivalent grayscale of the previous frame; send the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame to the second controller corresponding to the driver chip where the channel is located; the second controller is configured to: for the data segment, based on the first correspondence of the data segment, obtain the information of the data segment from the equivalent grayscale of the previous frame to the current equivalent grayscale; based on the information of the data segment, generate the data segment, and send the data segment to the driver chip corresponding to the second controller.

[0016] In some embodiments, the sum of the duration of the second compensation current and the duration of other non-zero currents is equal to the display period.

[0017] In some embodiments, the sum of the duration of the second compensation current and the duration of other non-zero currents is less than the display period.

[0018] In some embodiments, the sum of the duration of the second compensation current and the duration of other non-zero currents is equal to the scanning duration.

[0019] In a second aspect, the present application provides a backlight control method, which is applied to a display device, wherein the display device also includes a backlight component and a controller, the backlight component is coupled to the controller, the backlight component includes at least one driver chip and at least one lamp bead, the at least one lamp bead constitutes a light-emitting unit, the driver chip includes at least one channel, and the channel corresponds to the light-emitting unit; the method includes: the controller generates driving data of a current frame of a channel in the driver chip based on image data; the driving data of the channel includes multiple data segments; the controller also sends the driving data of the channel to the corresponding driver chip; the driver chip controls the current of the light-emitting unit corresponding to the channel of the driver chip based on the data segments in the driving data of the channel, and the currents under at least two of the multiple data segments are different and not zero.

[0020] In the display device and backlight control method provided herein, for each frame, the channel's drive data is configured as multiple data segments. A driver chip controls the current of the corresponding backlight group based on the channel's data segments. The currents in at least two of the multiple data segments are unequal and non-zero. Because a single frame display cycle includes at least two unequal current segments, at least one current can be used to adjust or compensate for the other currents to adjust the backlight, increasing the flexibility of backlight adjustment and, in turn, improving the display quality of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the embodiments of the present application, and together with the description, are used to explain the principles of the embodiments of the present application.

[0022] The above drawings illustrate specific embodiments of the present invention, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concepts of the present invention for those skilled in the art by reference to specific embodiments.

[0023] Figure 1 is a schematic diagram of an operation scenario between a display device and a control device according to some embodiments;

[0024] Figure 2 is a schematic structural diagram of a display device according to some embodiments;

[0025] Figure 3 A schematic diagram of the physical structure of the backlight assembly and display panel;

[0026] Figure 4 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0027] Figure 5 The structure of the driving data of a channel in an example is shown as follows: Figure 1 ;

[0028] Figure 6 The structure of the driving data of a channel in an example is shown as follows: Figure 2 ;

[0029] Figure 7 The structure of the driving data of a channel in an example is shown as follows: Figure 3 ;

[0030] Figure 8 The structure of the driving data of a channel in an example is shown as follows: Figure 4 ;

[0031] Figure 9The structure of the driving data of a channel in an example is shown as follows: Figure 5 ;

[0032] Figure 10 The structure of the driving data of a channel in an example is shown as follows: Figure 6 ;

[0033] Figure 11 A schematic diagram showing the structure of a device in another example;

[0034] Figure 12 A schematic diagram of the timing of scanning of each light-emitting unit in an example;

[0035] Figure 13 A schematic structural diagram of another display device provided in an embodiment of the present application;

[0036] Figure 14 A schematic diagram of the timing of scanning of each light-emitting unit in another example;

[0037] Figure 15 is a timing diagram of scanning of each light-emitting unit in another example;

[0038] Figure 16 FIG1 is a timing diagram of scanning of each backlight group in another example;

[0039] Figure 17 FIG1 is a timing diagram of scanning of each backlight group in another example;

[0040] Figure 18 The structure of the driving data of a channel in an example is shown as follows: Figure 7 ;

[0041] Figure 19 A flowchart of a backlight control method provided in an embodiment of the present application.

[0042] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0044] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0045] In the specification and claims of this application and the drawings, the terms "first," "second," and the like are used to distinguish similar or similar objects or entities and are not necessarily intended to limit a particular order or precedence, unless otherwise indicated. It should be understood that the terms used in this manner are interchangeable where appropriate, for example, the embodiments of this application can be implemented in an order other than that shown or described in the drawings.

[0046] In addition, the terms "including" and "having" and any variations thereof are intended to cover, but not exclude, inclusion. For example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such product or device. The term "circuitry" as used in this application 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 function associated with that element.

[0047] Figure 1 FIG. 1 is a schematic diagram of an operation scenario between a display device and a control device according to some embodiments. Figure 1 As shown, the user can operate the display device 200 through the smart device 300 or the control device 100 .

[0048] In some embodiments, the control device 100 may be a remote controller. Communication between the remote controller and the display device may include infrared protocol communication, Bluetooth protocol communication, or other short-range communication methods, and the display device 200 may be controlled wirelessly or wired. The user may control the display device 200 by inputting user commands through buttons on the remote controller, voice input, control panel input, and the like.

[0049] In some embodiments, a smart device 300 (such as a mobile terminal, tablet computer, computer, laptop computer, etc.) can also be used to control the display apparatus 200. For example, the display apparatus 200 can be controlled using an application running on the smart device.

[0050] In some embodiments, the display device 200 may not use the aforementioned smart device or control device to receive instructions, but may receive user control through touch or gestures.

[0051] In some embodiments, the display device 200 can also be controlled in a manner other than the control device 100 and the smart device 300. For example, the user's voice command control can be directly received through a module for obtaining voice commands configured inside the display device 200 device, or the user's voice command control can be received through a voice control device set outside the display device 200 device.

[0052] In some embodiments, the display device 200 also communicates data with the server 400. The display device 200 may be communicatively coupled via a local area network (LAN), a wireless local area network (WLAN), or other networks. The server 400 may provide various content and interactions to the display device 200. The server 400 may be a single cluster or multiple clusters, and may include one or more types of servers.

[0053] Figure 2 is a schematic structural diagram of a display device according to some embodiments.

[0054] In some embodiments, the display device 200 includes a controller 250, which is configured to receive a video input signal or an image input signal, obtain backlight data and display data from the video input signal or the image input signal, perform format conversion, timing control and other processing on the backlight data and display data, and then output them.

[0055] In some embodiments, the controller 250 may include a system-level controller (System On Chip, SOC for short), which is configured to obtain a video input signal or an image input signal (hereinafter referred to as input signal) from an external input port or a network port, and perform format conversion, data processing, image rendering and other operations on the input signal.

[0056] In some embodiments, the controller 250 may include a timing controller (Tcon) configured to perform timing control on the data obtained by the controller.

[0057] In some embodiments, the timing controller is further configured to perform data format conversion.

[0058] In some embodiments, the controller 250 may include a backlight controller (Bcon) or a dimming controller (DCON), configured to obtain processed data associated with backlight data, and generate and output driving data using the processed data.

[0059] In some embodiments, the display device 200 includes a display panel 10 coupled to a controller 250 , wherein the display panel 10 includes liquid crystal molecules configured to deflect based on received processed display data.

[0060] In some embodiments, the display device 200 includes a backlight assembly 20 coupled to a controller 250 , and configured to emit light based on driving data. The display panel 10 may display images based on the backlight provided by the backlight assembly 20 .

[0061] In some embodiments, the backlight assembly 20 includes a driving circuit 201 , which is coupled to a controller 250 . The driving circuit 201 includes at least one driving chip 202 , which is configured to generate a driving signal based on driving data.

[0062] In some embodiments, the backlight assembly 20 also includes a lamp board 30, which includes array-distributed lamp beads 301, at least one lamp bead is electrically connected to form a backlight group, and the backlight group is electrically connected to a driving end of the driving chip 202 and is configured to emit light based on a driving signal.

[0063] In some embodiments, in the backlight group, at least one lamp bead is connected in series to form a lamp string;

[0064] In other embodiments, in the backlight group, at least one lamp bead is connected in parallel;

[0065] In other embodiments, in the backlight group, at least one lamp bead is connected in series to form a lamp string, and then at least one lamp string is electrically connected in parallel.

[0066] Among them, the light string is a light string composed of lamp beads connected in series from left to right or from right to left, or a light string composed from top to bottom or from bottom to top, or a light string composed of lamp beads connected in series in a preset order (for example: rotating, bending, etc.).

[0067] Among them, the lamp beads can be composed of MiniLED, MicroLED, WLED, RGB-LED, GB-rLED or QLED (quantum dots).

[0068] The physical structure diagram of the backlight assembly 20 and the display panel 10 is shown in FIG. Figure 3 As shown, the display panel 10 is placed on the upper side of the backlight assembly, and the upper side of the display panel 10 can display images.

[0069] In some embodiments, the backlight assembly 20 includes a backplate 407 configured as a substrate to provide support.

[0070] In some embodiments, the backlight assembly 20 includes a lamp board 30 , on which lamp beads are disposed, and is configured to provide backlight.

[0071] In some embodiments, the backlight assembly 20 includes: a reflective sheet 404 configured to reflect backlight from the light panel toward the diffuser panel;

[0072] In some embodiments, the backlight assembly 20 includes: a bracket 403 configured to support the diffuser plate 402, the membrane 401, etc., to maintain an optical distance between the light board and the diffuser plate;

[0073] In some embodiments, the backlight assembly 20 includes: a diaphragm 401;

[0074] In some embodiments, the backlight assembly 20 includes: a diffuser plate 402;

[0075] The diaphragm 401 and the diffuser plate 402 are configured to improve the reflective efficiency of the backlight generated by the backlight assembly, uniformly guide light, increase brightness and color saturation, and adjust the light so that the brightness distribution of the entire display panel is more uniform.

[0076] In some embodiments, the arrangement order of the components in the backlight assembly 20 from top to bottom is: diaphragm 401 , diffuser 402 , bracket 403 , reflector 404 , lamp board 30 , and backboard 407 .

[0077] In other embodiments, the backlight assembly 20 further includes a honeycomb panel 405 and a vibrator 406, which are placed between the light panel 30 and the back panel 407 and are configured to drive the backlight assembly 20 and the display panel 10 to vibrate and produce sound based on a sound signal.

[0078] In some embodiments, taking a micro-LED display device as an example, a plurality of lamp boards 30 are provided in the backlight assembly 20. After being spliced ​​together, the plurality of lamp boards 30 jointly emit light to provide backlight to the display panel 10. Each lamp board 30 includes a plurality of light-emitting areas, and each light-emitting area (also called a partition) includes a plurality of micro lamp beads, which are micron-level lamp beads such as miniLED and microLED.

[0079] The light board 30 is electrically connected to the driving circuit, which includes one or more driving chips. The driving chip of each partition receives the processed backlight data sent by Bcon or Dcon, and drives the corresponding lamp beads to emit light based on the processed backlight data, thereby realizing local backlight control of the backlight component, that is, realizing Local dimming, thereby achieving more accurate regional light control and making the screen brightness more uniform and harmonious.

[0080] In some embodiments, the driver chip includes one or more channels, each connected to a light-emitting unit. Based on the drive data corresponding to each channel, the driver chip drives the corresponding backlight group to emit light. The light-emitting units corresponding to each channel form a partition, and each channel's corresponding light-emitting unit is independently controlled, further refining the partitions and improving the backlight adjustment accuracy.

[0081] In some embodiments, the backlight group is a light string including one or more lamp beads connected in series.

[0082] In related technologies, for each frame, the driver chip controls the corresponding backlight group based on the channel's drive data, emitting light at a constant operating current. Alternatively, based on black insertion technology, a black insertion data segment is set in the channel's drive data. During a frame's display cycle, the driver chip turns off the backlight based on the black insertion data segment, and drives the corresponding backlight group to emit light at a constant operating current during other periods.

[0083] The switching between two consecutive frames is achieved by flipping the liquid crystal molecules. During the flipping process, the screen will show the change process between the two frames, which will cause ghosting. To solve this problem, the backlight is turned off between the two frames to achieve a black display. When the liquid crystal molecules of the next frame flip into place, the backlight is turned on. In this way, the two consecutive frames are directly displayed between the two frames without showing the change process, thus reducing the ghosting phenomenon. This is also called black insertion technology.

[0084] However, the display effect of the display device in the above solution is not good. For example, due to the existence of black insertion period, the brightness of the backlight is very low. Improving the display effect by adjusting the backlight has become a hot topic of research.

[0085] To address the above issues, the display device provided in this application sets the channel's drive data into multiple data segments for each frame. The driver chip controls the current of the light-emitting unit corresponding to the channel based on the channel's data segments, wherein the currents in at least two of the multiple data segments are unequal and non-zero. Because a single frame display cycle includes at least two unequal current segments, at least one current can be used to adjust or compensate for the other currents to adjust the backlight, thereby increasing the flexibility of backlight adjustment and, in turn, improving the display quality of the display device.

[0086] The technical solutions of the present application and the technical solutions of the present application are described in detail below with reference to specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in certain embodiments. In the description of the present application, unless otherwise clearly specified and limited, each term should be understood in a broad sense within the art. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0087] In some embodiments, Figure 4 A schematic diagram of the structure of a display device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the backlight assembly 20 of the display device includes at least one driver chip 202 and at least one lamp bead.

[0088] In some embodiments, at least one lamp bead is arranged in an array in the lamp panel.

[0089] In some embodiments, at least one row or column of lamp beads form a light-emitting group, wherein the lamp beads in the same light-emitting group are scanned simultaneously. In the row scanning scenario, the light-emitting group can be understood as a row in the row-by-row scanning.

[0090] In some embodiments, at least one lamp bead constitutes the light emitting unit 205 .

[0091] In some embodiments, the lamp beads in the same light-emitting unit 205 are located in the same light-emitting group.

[0092] In some embodiments, continue to refer to Figure 4 The driving chip 202 includes at least one channel 204 , and the channel 204 corresponds to the light-emitting unit 205 .

[0093] In some embodiments, the channels 204 correspond to the light emitting units 205 in a one-to-one manner.

[0094] In some embodiments, the controller 250 of the display device is configured to generate driving data for the channel 204 in the driver chip 202 based on a frame of image data, wherein the driving data for the channel 204 includes a plurality of data segments.

[0095] The image data may be data before image processing or data processed based on image processing technology.

[0096] In some embodiments, the data segment includes a pulse width modulation signal (PWM).

[0097] The current value of the light emitting unit 205 corresponding to the channel 204 can be controlled by the PWM signal amplitude and duty cycle.

[0098] In some embodiments, a higher amplitude results in a higher current, and a larger duty cycle results in a higher current.

[0099] In some embodiments, the data segment includes a continuous low level or a continuous high level, and the driver chip 202 turns off the corresponding light emitting unit 205 during the period of the continuous high level or the continuous low level.

[0100] Figure 5 The structure of the driving data of a channel in an example is shown as follows: Figure 1 ,like Figure 5 As shown, the driving data of the channel 204 in one frame may include multiple segments of PWM signals, such as data segment 1 and data segment 2, or include a continuous level segment, such as data segment 3.

[0101] In some embodiments, the driver chip 202 is configured to control the current of the light-emitting unit 205 corresponding to the channel 204 of the driver chip 202 based on the data segment in the driving data of the channel 204, and the current in at least two data segments among the multiple data segments is different and not zero.

[0102] That is to say, in this embodiment, the light emitting unit corresponding to the channel is driven by at least two non-zero currents in a display period of one frame. Figure 5 The current corresponding to the first data segment is I1, the current corresponding to the second data segment is I2, and the third data segment is a 0 level segment. I1 and I2 are not equal and are not zero.

[0103] Since a display period of one frame includes at least two unequal currents, at least one current can be used to adjust or compensate for the other currents to adjust the backlight, thereby improving the flexibility of backlight adjustment and further improving the display effect of the display device.

[0104] In some embodiments, the plurality of data segments include a working data segment and at least one compensation data segment, and a compensation current in at least one of the at least one compensation data segment is different from a working current in the working data segment.

[0105] For example, if Figure 5 As shown, data segment 1 is the working data segment, and data segment 2 and data segment 3 are the compensation data segments.

[0106] The operating current is the current required for the image in the current frame, which can be determined based on the equivalent grayscale of the image in the current frame. The compensation current is the current used to compensate for the operating current. It can be understood that the operating current in the operating data segment ensures image display, while the compensation current in the compensation data segment adjusts the backlight and improves the display effect.

[0107] In some embodiments, the controller 250 is configured to determine the lengths of the working data segment and the compensation data segment based on a frame of image data, wherein the length of the data segment corresponds to the duration of the current in the data segment.

[0108] Continue to refer to Figure 5 The length of the data segment is the duration of the corresponding current. The longer the data segment, the longer the current lasts, and the higher the backlight brightness within a frame display cycle. If the length of data segment 1 is greater than the length of data segment 2 and the length of data segment 3, then t1 is greater than t2 and t3.

[0109] That is to say, in this embodiment, the duration corresponding to each current segment is determined based on the image data of the current frame, and the duration corresponding to different frames may be different, so that the backlight can be further controlled based on the length of each data segment.

[0110] In some embodiments, the length of the working data segment is greater than the length of the compensation data segment.

[0111] like Figure 5 In the example, the length of data segment 1 is longer than the length of data segment 3. This can reduce overcompensation.

[0112] In some embodiments, the data segments corresponding to non-zero currents in the plurality of data segments are continuous.

[0113] Continue to refer to Figure 5 , data segments 1 and 2 in which the current is not zero are continuous, wherein the current in data segment 3 is zero, that is, the black period.

[0114] In this embodiment, the non-zero current is continuous. Compared with the solution of inserting a light-emitting period into a black insertion period, the duration of the black insertion period can be increased, thereby improving the black insertion effect.

[0115] In some embodiments, the image data includes an equivalent grayscale of a pixel unit of a current frame.

[0116] In some embodiments, each pixel unit may correspond to at least one light-emitting unit. Each pixel unit may include red, green, and blue (RGB) light, and each light may correspond to a different grayscale. The equivalent grayscale in this embodiment is the equivalent grayscale of the combination of the three lights.

[0117] The number of equivalent grayscale levels is not limited and can include 32-bit equivalent grayscale or 256-bit equivalent grayscale. The equivalent grayscale of the current frame includes the equivalent grayscale of each pixel unit, where the pixel unit corresponds to the liquid crystal molecule, and the liquid crystal molecule corresponds to the light-emitting unit providing the backlight.

[0118] In some embodiments, the at least one compensation data segment includes a first compensation data segment;

[0119] If the equivalent grayscale of the current frame of the corresponding pixel unit is higher than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the first compensation data segment is less than the working current;

[0120] If the equivalent grayscale of the current frame of the corresponding pixel unit is lower than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the first compensation data segment is greater than the operating current.

[0121] It should be noted that the comparison of the equivalent grayscale of the current frame with the equivalent grayscale of the previous frame, wherein the equivalent grayscale refers to the equivalent grayscale of the pixel unit corresponding to the liquid crystal molecule corresponding to the light-emitting unit in the channel.

[0122] Figure 6 This is a schematic diagram of the structure of the channel's driver data. Figure 2 ,like Figure 6 As shown, data segment 1 is the working data segment, and data segment 2 is the first compensation data segment. In three consecutive frames, the equivalent grayscale of the second frame is lower than that of the previous frame (the first frame). In the second frame, the current I1 under data segment 1 is lower than the current I2 under data segment 2. The equivalent grayscale of the third frame is higher than that of the previous frame (the second frame). In the third frame, the current I1 under data segment 1 is higher than the current I2 under data segment 2.

[0123] Since the light-emitting units are turned off during the black insertion period, the backlight brightness of a frame display cycle is reduced. However, in this embodiment, according to the equivalent grayscale of the image, the corresponding light-emitting units are controlled to use a first compensation current within a cycle to compensate, thereby extending the backlight on time, thereby ensuring the display effect and increasing the image brightness.

[0124] In some embodiments, the first compensation data segment is continuous with the working data segment.

[0125] like Figure 5 、 Figure 6 In the example, data segment 1 and data segment 2 are continuous, which can reduce the impact of the corresponding black insertion effect.

[0126] In some embodiments, the display device further includes a display panel, wherein the display panel includes at least one liquid crystal molecule corresponding to the light-emitting unit.

[0127] In some embodiments, one liquid crystal molecule corresponds to one or more light-emitting units.

[0128] In other embodiments, one light-emitting unit corresponds to one or more liquid crystal molecules.

[0129] In some embodiments, the image data includes display data, and the display data includes grayscale equivalents.

[0130] In some embodiments, the display panel is configured to control flipping of liquid crystal molecules based on display data.

[0131] In some embodiments, the duration of the first compensation current is shorter than the duration of the flipping of the liquid crystal molecules corresponding to the light-emitting unit, so that a black insertion period can be reserved.

[0132] In some embodiments, the driver chip 202 is configured to drive the light-emitting unit to emit light based on the first compensation current under the first compensation data segment before the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel complete the flip from the previous frame to the current frame.

[0133] The flipping of liquid crystal molecules causes the image to transition from one frame to another. Therefore, the flipping of the liquid crystal molecules begins in the previous frame and ends in the next frame. To implement BFI black insertion technology, the operating current drives the light-emitting unit to emit light when the corresponding liquid crystal molecules flip into position. In this embodiment, the first compensation data segment is continuous with the operating data segment. The driver chip emits light based on the first compensation current before the corresponding liquid crystal molecules complete flipping. Therefore, in this embodiment, the first compensation current precedes the operating current and does not shorten the duration of the operating current.

[0134] For example, Figure 7 The structure of the driving data of a channel in an example is shown as follows: Figure 3 ,like Figure 7 As shown, data segment 2 is the working data segment, data segment 3 is the first compensation data segment, and the first compensation data segment (data segment 3) is located after the working data segment (data segment 2). The driving data of the current frame includes 4 data segments, of which data segment 1 and data segment 4 are black insertion data segments, data segment 2 is the first compensation data segment, and data segment 3 is the working data segment. Point A is the point where the corresponding liquid crystal molecules end flipping from the previous frame to the current frame, and point B is the point where the corresponding liquid crystal molecules start flipping from the current frame to the next frame. Segments AB can be understood as the period of stability of the liquid crystal molecules. Corresponding to the working data segment, the first compensation data segment (data segment 2) is located before the working data segment (data segment 3). In other embodiments, the driver chip 202 is configured to: after the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel start flipping from the current frame to the next frame, the light-emitting unit is driven to emit light based on the first compensation current under the first compensation data segment.

[0135] In this embodiment, the first compensation current is located after the working current. For example, Figure 8 The structure of the driving data of a channel in an example is shown as follows: Figure 4 ,like Figure 8 As shown, the driving data of the current frame includes 4 data segments, among which data segment 1 and data segment 4 are black insertion data segments, data segment 2 is the working data segment, and data segment 3 is the first compensation data segment. Point A is the point where the corresponding liquid crystal molecules end flipping from the previous frame to the current frame, and point B is the point where the corresponding liquid crystal molecules start flipping from the current frame to the next frame. Segments AB can be understood as the period of stability of the liquid crystal molecules, corresponding to the working data segment. The first compensation data segment (data segment 3) is located after the working data segment (data segment 2).

[0136] In another embodiment, the driving chip 202 is configured to drive the light-emitting unit to emit light based on the first compensation current under the first compensation data segment before the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel complete the flip from the previous frame to the current frame and after the corresponding liquid crystal molecules start to flip from the current frame to the next frame.

[0137] That is to say, in this embodiment, the first compensation current includes multiple segments, and the multiple segments of the first compensation current are located on both sides of the working current and are continuous with the working current. For example, Figure 9 The structure of the driving data of a channel in an example is shown as follows: Figure 5 The figure includes two consecutive frames, in which the driving data of one frame includes 5 data segments, data segment 1 and data segment 5 are black-inserted data segments, data segment 2 and data segment 4 are first compensation data segments, and data segment 3 is a working data segment, wherein data segment 2 and data segment 4 are located on both sides of data segment 3.

[0138] In this embodiment, the first compensation current is divided into two parts, which are located on both sides of the working current. This can balance the current and improve the stability of the backlight.

[0139] In some embodiments, the first compensation current before the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel finish flipping is smaller than the first compensation current after the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel start flipping.

[0140] like Figure 9 As shown, the current corresponding to data segment 4 is greater than the current corresponding to data segment 2.

[0141] In some embodiments, the number of the first compensation data segments is multiple.

[0142] In some embodiments, if the equivalent grayscale of the current frame of the corresponding pixel unit is higher than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the plurality of first compensation data segments decreases in a direction away from the working current;

[0143] In some embodiments, if the equivalent grayscale of the corresponding pixel unit in the current frame is lower than the equivalent grayscale of the pixel unit in the previous frame, the first compensation currents under the first compensation data segments increase in a direction away from the working current.

[0144] Figure 10 The structure of the driving data of a channel in an example is shown as follows: Figure 6 ,like Figure 10As shown in the figure, taking the second frame as the current frame as an example, the equivalent grayscale of the previous frame is higher than the equivalent grayscale of the current frame. Among them, data segments 1 and data segments 7 are black insertion data segments, data segments 2 and data segments 3 are the first compensation data segments before the working data segment, data segment 4 is the working data segment, and data segments 5 and 6 are the first compensation data segments after the working data segment. The duty cycle gradually decreases from data segment 2 to data segment 3, and the corresponding current gradually decreases. The duty cycle gradually increases from data segment 5 to data segment 6, and the corresponding current gradually increases.

[0145] In this embodiment, a plurality of first compensation currents gradually approaching the operating current are used to reduce the gap between the plurality of currents, thereby improving the stability of the backlight.

[0146] In some embodiments, the controller is configured to: for the data segment of the channel, determine the information of the data segment from the equivalent grayscale of the previous frame to the current equivalent grayscale based on the first correspondence between the first grayscale to the second grayscale (Gray level1-Gray level2, abbreviated as G1-G2) and the information of the data segment.

[0147] That is to say, for each data segment, a first correspondence between G1-G2 and the information of the data segment is established.

[0148] It should be noted that for each G1-G2 combination, a first correspondence relationship can be established with each data segment. For example, in an example including 32 equivalent grayscale levels, any two equivalent grayscales from 0 to 31 are arranged and combined, and for each combination, a first correspondence relationship is established with each data segment. Different data segments may have different first correspondence relationships established for the same combination.

[0149] In some embodiments, the first correspondences between the multiple data segments are not completely the same.

[0150] It can be understood that the current values ​​under the data segments with the same first correspondence are equal, and similarly, the current values ​​under the data segments with different first correspondences are different.

[0151] In some embodiments, the information of the data segment includes the length of the data segment.

[0152] As can be seen, the longer the data segment, the longer the corresponding current duration. The liquid crystal molecules can have different flipping times for different equivalent grayscale change values. A larger equivalent grayscale change value corresponds to a longer flipping time. A longer black insertion period also has a greater impact on backlight brightness. Therefore, setting the corresponding compensation current based on the equivalent grayscale can further improve the accuracy of backlight adjustment.

[0153] In an embodiment where the data segment includes a PWM signal, the information in the data segment also includes the duty cycle and amplitude of the PWM signal to determine the corresponding current value.

[0154] As can be seen from the above embodiment, the starting time of the operating current corresponding to the working data segment is when the corresponding liquid crystal molecules finish flipping, and the ending time of the operating current is when the corresponding liquid crystal molecules begin flipping. The first compensation data segment is continuous with the working data segment. Therefore, by determining the length of the first compensation data segment, the starting and ending times of the current within the first compensation data segment can be determined. In other words, the current value and duration of each current segment in the current frame are determined based on the equivalent grayscale of the previous frame and the current equivalent grayscale.

[0155] In some embodiments, there is one controller 250, and a first correspondence relationship is stored in the controller 250. The controller 250 is configured to generate multiple data segments for each channel based on the first correspondence relationship, and send the multiple data segments for each channel to the corresponding driver chip 202. In this embodiment, the controller 250 can store one copy of the correspondence relationship.

[0156] In some embodiments, the controller 250 includes a first controller and at least one second controller, wherein the first controller is coupled to the second controller.

[0157] In some embodiments, the second controller corresponds to the driver chip 202 and the second controller stores the first corresponding relationship, that is, each second controller stores a copy of the first corresponding relationship.

[0158] In some embodiments, the second controller is integrated into the corresponding driver chip 202 .

[0159] In some embodiments, the first controller is configured to:

[0160] For each channel, based on the image data of the current frame, obtain the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame;

[0161] The equivalent grayscale of the current frame and the equivalent grayscale of the previous frame are sent to the second controller corresponding to the driving chip 202 where the channel is located.

[0162] In some embodiments, the second controller is configured to:

[0163] For the data segment, based on the first corresponding relationship of the data segment, information of the data segment from the previous frame equivalent grayscale to the current equivalent grayscale is obtained;

[0164] Based on the information of the data segment, a data segment is generated, and the data segment is sent to a driver chip corresponding to the second controller.

[0165] In other words, multiple driver chips share a single first controller, which only needs to send equivalent grayscale data to the corresponding driver chip's second controller. This equivalent grayscale data is relatively small, reducing transmission pressure. The second controller is responsible for generating and sending multiple data segments based on the first correspondence. Since each second controller corresponds to a driver chip one-to-one, the second controller transmits larger amounts of data in a one-to-one manner. Compared to the one-to-many transmission of larger amounts of data in the aforementioned example, this embodiment achieves higher transmission efficiency.

[0166] In some embodiments, the display device performs display based on a row scanning or column scanning technique, that is, the same light-emitting group is lit one by one. The display device further includes a power supply circuit 13, wherein the power supply circuit 13 can be a power supply board. Figure 11 A schematic diagram showing the structure of a device in another example is shown in FIG. Figure 11 As shown, using row scanning as an example, the power supply circuit 13 is connected to the light-emitting units in each light-emitting group 206. The lamps in the same light-emitting unit 205 are located in the same light-emitting group. The lamps in the same light-emitting unit are illuminated simultaneously. The controller 250 controls the current supplied to each light-emitting unit by the power supply circuit 13 by sending drive data to the corresponding driver chip 202. Different light-emitting units are connected in parallel.

[0167] In related art, before the corresponding liquid crystal molecules flip into position, the driver chip 202 controls the current of the light-emitting unit to zero, thereby turning off the backlight. When the liquid crystal molecules in the corresponding row flip into position, the light-emitting unit is driven to emit light based on the corresponding operating current. In practical applications, the shorter the backlight is on, the better the effect of reducing tailing.

[0168] Figure 12 FIG. 1 is a timing diagram of scanning of each light-emitting unit in an example. Figure 12 As shown, when the on-time Ton of each light-emitting unit is shortened to a certain length of time, the total current will have a period of zero, so the power board needs to output intermittent current. The power board usually includes an LLC resonant circuit. The output voltage of the power board is driven by the LLC resonant circuit. The response speed of the LLC resonant circuit is not high. If the on-time is too short, the LLC resonant circuit cannot respond in time, which will cause a large fluctuation in the output voltage. In order to ensure the stability of the output voltage, the on-time of the light-emitting unit cannot be too short. However, due to the limitation of the performance of the power board, the ghosting cannot be further reduced, resulting in poor effect in reducing the ghosting phenomenon.

[0169] The following embodiments are intended to solve the above problems.

[0170] In some embodiments, the at least one compensation data segment includes at least one second compensation data segment.

[0171] In some embodiments, the working current in the working data segment is greater than the second compensation current in the second compensation data segment, the second compensation current is not greater than the first threshold, and the second compensation current is not zero.

[0172] The first threshold corresponds to a smaller equivalent grayscale, that is, the equivalent grayscale corresponding to the second compensation current is smaller and approximately zero.

[0173] In some embodiments, the second compensation current is a fixed value less than the first threshold value. In other words, the second compensation current is equal in each frame. This can reduce the computational burden of the controller.

[0174] In some other embodiments, the ratio of the second compensation current to the operating current is a first value, where the first value is less than 1.

[0175] If the second compensation current obtained based on the first value and the operating current of the current frame is greater than the first threshold, the first threshold is used as the second compensation current of the current frame. Conversely, if the second compensation current obtained is not greater than the first threshold, the second compensation current obtained is used as the second compensation current of the current frame.

[0176] In some embodiments, the second compensation current is set based on a minimum current to which the power board can respond in a timely manner.

[0177] Different light-emitting units are connected in parallel, so the sum of the second compensation currents of the light-emitting units in the same backlight group is not less than the minimum current that responds in time. For example, the minimum current I that the power board responds in time, the number of light-emitting groups is n, and the number of light-emitting units in each light-emitting group is m, then the second compensation current I 补 =I / nm.

[0178] In some embodiments, the lamp beads in the same light-emitting unit are in the same light-emitting group, that is, the lamp beads corresponding to the same light-emitting unit are turned off or on at the same time.

[0179] In some embodiments, the sum of the duration of the second compensation current and the duration of other non-zero currents is not less than the scanning duration; the scanning duration is the ratio of the display period to the number of light-emitting groups.

[0180] The display period is the inverse of the refresh rate.

[0181] For example, if the display's scanning frequency (also known as the image refresh rate) is 120 Hz, and one light-emitting group corresponds to one row of lamp beads, and the number of rows of lamp beads in the backlight assembly is 6, then the scanning time = 1 / 120 / 6 = 1.39 μs. This means that the sum of the duration of the second compensation current and the duration of other non-zero currents is no less than 1.39 μs.

[0182] In some embodiments, the other non-zero current includes an operating current.

[0183] In some other embodiments, other non-zero currents include the operating current and the first compensation current in the above example.

[0184] In this embodiment, the current in each channel includes a second compensation current that is less than the first threshold. The second compensation current corresponds to a lower equivalent grayscale, and the lamp beads driven by the second compensation current can approximate a pseudo-black insertion state. In other words, during each display cycle, the second compensation current maintains the black insertion effect while ensuring that the total current does not fall below the minimum current that the power board can respond to in a timely manner. This ensures that the power board always maintains a stable operating state, and the duration of the operating current is no longer limited by the power board's performance. This can further reduce the duration of the operating current, further reducing the smearing phenomenon and improving the display quality.

[0185] In some embodiments, the sum of the duration of the other non-zero currents and the duration of the second compensation current is equal to the display period.

[0186] Explain with actual scenarios. Figure 13 A schematic diagram of another device structure provided in an embodiment of the present application is shown in FIG. Figure 13 As shown, for the convenience of description, the duration of other non-zero currents is set as the first light-emitting duration, and the duration of the second compensation current is set as the second light-emitting duration. t1-t7 is a display cycle. Taking the light-emitting group including a row of lamp beads as an example, in the light-emitting units in the first row, t1'-t1 is the first light-emitting duration of the light-emitting unit 1 in the first row, which is Ton in the related art, and t6-t1' is the second light-emitting duration of the light-emitting unit 1 in the first row. The sum of the first light-emitting duration and the second light-emitting duration is the display cycle. In other words, each light-emitting unit is illuminated either based on other non-zero currents or based on the second compensation current. In this way, the light-emitting unit only needs to have two data segments for emitting light, thereby reducing the control difficulty of the controller 250.

[0187] In other embodiments, the sum of the duration of the other non-zero currents and the duration of the second compensation current is less than the display period.

[0188] In this example, the sum of the first light-emitting duration (duration of the working current) and the second light-emitting duration (duration of the second compensation current) is less than the display cycle and greater than the scanning duration. Each light-emitting unit includes three time periods in the display cycle, the first light-emitting duration, the second light-emitting duration and the backlight-off duration. It should be noted that although the equivalent grayscale of the second light-emitting duration is smaller, it is still not as effective as reducing the tailing phenomenon when the backlight is completely turned off. Therefore, compared with the above example, in this example, the increased backlight-off duration can improve the black insertion effect, reduce the tailing phenomenon, and further improve the display quality of the image.

[0189] In some other embodiments, the sum of the duration of the other non-zero current and the duration of the second compensation current is equal to the scanning duration.

[0190] This is explained in combination with actual scenarios: Figure 14 FIG. 1 is a timing diagram of scanning of each light-emitting unit in another example, as shown in FIG. Figure 14 As shown, t1-t7 is a display cycle. Taking this display cycle as an example, the display device includes 6 rows of lamp beads, and each light-emitting group corresponds to a row of lamp beads. The refresh frequency is 120Hz, and the scanning time is 1.39us. In this example, the sum of the first light-emitting time and the second light-emitting time of the light-emitting unit of each light-emitting group is equal to 1.39s. Taking the light-emitting unit 2 in the second row as an example, t2'-t2 is the first light-emitting time of the light-emitting unit 2 in the second row, t3-t2' is the second light-emitting time of the light-emitting unit 2 in the second row, and t2-t1+t7-t3 is the backlight-off time of the light-emitting unit in the second row. It can be understood that the backlight-off time of each light-emitting unit in this example is the longest. Therefore, the tailing phenomenon can be further reduced in this example.

[0191] The following is an exemplary introduction to a method for controlling corresponding light-emitting units based on multiple data segments in driving data.

[0192] Take the example in which the compensation data segment includes the second compensation data segment.

[0193] In some embodiments, the plurality of data segments include a working data segment and a second compensation data segment, the working data segment includes a first PWM signal, and the second compensation data segment includes a second PWM signal.

[0194] In some embodiments, the controller 250 is configured to:

[0195] For each channel, a first PWM signal and a second PWM signal are output based on a frame of image, wherein the duty cycle of the first PWM signal is greater than the duty cycle of the second PWM signal; and the amplitudes of the first PWM signal and the second PWM signal are equal.

[0196] The driver chip 202 is configured to adjust the current flowing through the corresponding light-emitting unit based on the duty cycle of the PWM signal. Generally, the duty cycle is proportional to the current.

[0197] In some embodiments, the second light-emitting duration of the light-emitting unit is located after the first light-emitting duration of the light-emitting unit and is continuous with the first light-emitting duration of the light-emitting unit.

[0198] For example, Figure 15 FIG. 1 is a timing diagram of scanning of each light emitting unit in another example, as shown in FIG. Figure 15 As shown, the second light-emitting duration of each light-emitting unit is continuously connected to the first light-emitting duration, and the second PWM signal is continuously connected to the first PWM signal. Starting from the first row, the driver chip 202 corresponding to the light-emitting unit in each row first drives the corresponding light-emitting unit to emit light based on the working current, and then drives the corresponding light-emitting unit to emit light based on the second compensation current.

[0199] In this example, the second PWM signal of each light-emitting unit is continuously connected to the first PWM signal, and the PWM signals are more orderly, so it is convenient for the controller 250 to send the corresponding PWM signals according to the corresponding timing.

[0200] In some other examples, the plurality of light-emitting groups are divided into a first number of backlight groups. A display cycle includes a first number of sub-display cycles, and the first light-emitting duration and the second light-emitting duration of the same light-emitting unit are in different sub-display cycles; the backlight groups correspond to the sub-display cycles.

[0201] For example, a display device includes six light-emitting groups, each corresponding to a row of lamp beads. Rows 1 through 3 constitute the first backlight group, rows 4 through 6 constitute the second backlight group, and row 6 constitutes the third backlight group. These three backlight groups correspond to the first, second, and third sub-display periods, respectively. Each sub-display period is equal to the ratio of the display period to the first number. For example, if the display period of the display device is 1 / 120 μs, then each sub-display period is equal to 1 / 360 μs.

[0202] In some embodiments, the controller 250 is specifically configured to:

[0203] For each sub-display period, the first pulse modulation signal is sent to the light-emitting units in the corresponding backlight group respectively.

[0204] The second pulse modulation signal is sent to the light-emitting units in the other backlight groups or a constant first level is output, wherein the light-emitting units do not work when receiving the constant first level.

[0205] The first lighting duration of the lighting unit in the backlight group corresponding to the current sub-display period is continuously followed by the second lighting duration of other lighting units.

[0206] The following is an explanation based on actual scenarios: Figure 16 FIG. 1 is a timing diagram of scanning of each backlight group in another example, as shown in FIG. Figure 16 As shown, taking row scanning as an example, the display device includes 6 light-emitting groups, each light-emitting group corresponds to a row of lamp beads, wherein the light-emitting units in the first to third rows are the first backlight group, the light-emitting units in the fourth to fifth rows are the second backlight group, and the light-emitting units in the sixth row are the third backlight group. The first backlight group, the second backlight group and the third backlight group correspond to the first sub-display period, the second sub-display period and the third sub-display period, respectively. In the first sub-display period, the controller 250 sends a first PWM signal to the light-emitting units in the corresponding first backlight group, and the light-emitting units in the first to third rows are sequentially lit with the working current. A second PWM signal or a 0-level signal is sent to each light-emitting unit in the second backlight group and the third backlight group; the first light-emitting duration of each light-emitting unit in the first backlight group is continuously followed by the second light-emitting duration of other light-emitting units.

[0207] For example, the first light-emitting duration of the light-emitting units in the first row is followed by the second light-emitting duration of the light-emitting units in the fifth row, and after the first light-emitting duration of the light-emitting units in the second row, the second light-emitting duration of the light-emitting units in the sixth row is received. In the second sub-display cycle, the controller 250 sends a first PWM signal to the first light-emitting duration of each light-emitting unit in the corresponding second backlight group, and sends a second PWM signal or a 0-level signal to the light-emitting units in the first backlight group and the third backlight group. And the first light-emitting duration of the light-emitting units in the second backlight group is followed by the second light-emitting duration of other light-emitting units, such as the first light-emitting duration of the light-emitting units in the fourth row is followed by the second light-emitting duration of the light-emitting units in the second row. Then in the third sub-display cycle, the controller 250 sends a first PWM signal to the first light-emitting duration of the light-emitting units in the third backlight group, and sends a second PWM signal or a 0-level signal to other backlight groups, such as sending a 0-level signal to the first to third backlight groups.

[0208] It should be noted that it is difficult for controller 250 to output two PWM signals with different duty cycles in the same period. Therefore, in the above example where the first and second light-emitting durations are continuous, the requirements for controller 250 are high, resulting in higher costs. In this example, however, the first and second light-emitting durations of the same light-emitting unit occur in different sub-display periods. Thus, only one PWM signal is output in each period, thus reducing the requirements for controller 250.

[0209] Based on the above examples, in some embodiments, the first quantity is two, the first quantity of backlight groups includes: a first backlight group and a second backlight group, the first quantity of sub-display cycles includes a first sub-display cycle and a second sub-display cycle, the first backlight group corresponds to the first sub-display cycle, and the second backlight group corresponds to the second sub-display cycle; the first backlight group includes the first second quantity of rows of lamp beads, the second backlight group includes the last first quantity minus the second quantity, and the second quantity is the ratio of the sum of the first quantity plus one to two.

[0210] In the first sub-display period, the first lighting duration of the lighting units in the rows other than the last row in the first backlight group is followed by the second lighting duration of the lighting units in the corresponding row in the second backlight group;

[0211] In the second sub-display period, the second lighting durations of the lighting units in the first backlight group except the last row are successively followed by the first lighting durations of the lighting units in the corresponding row in the second backlight group.

[0212] This is explained in combination with actual scenarios: Figure 17 FIG. 1 is a timing diagram of scanning of each backlight group in another example, as shown in FIG. Figure 17 As shown, the display device includes 5 rows of light-emitting groups, each light-emitting group corresponds to a row of lamp beads, and the corresponding second number is (5+1) / 2=3. Then, the first to third rows are the first backlight group, and the second to fifth rows are the second backlight group. The first row is the first row of the first backlight group, and the fourth row is the first row of the second backlight group. Therefore, the light-emitting units in the first row correspond to the light-emitting units in the fourth row, and the light-emitting units in the second row correspond to the light-emitting units in the fifth row. In the first sub-display period, the controller 250 sends a first PWM signal to the driver chip 202 of the corresponding light-emitting unit during each first light-emitting duration of the first to third rows. After sending the first PWM signal to the light-emitting units in the first row, it continuously sends a second PWM signal to the corresponding light-emitting unit in the fourth row. After sending the first PWM signal to the light-emitting units in the second row, it continuously sends a second PWM signal to the light-emitting units in the fifth row. In the second sub-display period, the controller 250 sends the first PWM signal to the light-emitting units in the fourth to fifth rows, and sends the second PWM signal to the light-emitting units in the first to third rows. After receiving the second PWM signal, the light-emitting units in the first row continuously send the first PWM signal to the corresponding light-emitting units in the fourth row, and after sending the second PWM signal to the light-emitting units in the second row, continuously send the first PWM signal to the corresponding light-emitting units in the fifth row.

[0213] It can be understood that the more sub-display cycles there are, the more control signals the controller 250 sends, and the more complicated the processing process of the controller 250 is. In this example, two sub-display cycles are used and divided into two backlight groups, which can further reduce the difficulty of signal processing by the controller 250.

[0214] In some embodiments, the plurality of data segments include a working data segment, at least one first compensation data segment, and at least one second compensation data segment.

[0215] Figure 18 The structure of the driving data of a channel in an example is shown as follows: Figure 7 ,like Figure 18 As shown in the figure, the channel drive data includes five data segments, of which data segments 1 and 5 are the second compensation data segments, data segments 2 and 4 are the first compensation data segments, and data segment 3 is the working data segment. The duty cycle of each data segment is in the order of data segment 4, data segment 2, data segment 3, data segment 1, and data segment 5 from high to low, and the corresponding current decreases in this order.

[0216] The data segments in this embodiment include a first compensation data segment and a second compensation data segment, which compensates for the brightness of the backlight while ensuring the stability of the power supply.

[0217] In some embodiments, the backlight control method provided by the present application is as follows: Figure 19 As shown, including:

[0218] S101. A controller generates driving data of a current frame for a channel in a driver chip based on image data; wherein the driving data for the channel includes multiple data segments;

[0219] S102: The controller further sends the driving data of the channel to the corresponding driving chip;

[0220] S103: The driver chip controls the current of the light-emitting unit corresponding to the channel of the driver chip based on the data segments in the driving data of the channel, wherein the currents in at least two data segments among the multiple data segments are different and non-zero.

[0221] In some embodiments, S101 includes: determining the lengths of the working data segment and the compensation data segment based on a frame of image data; wherein the length of the data segment corresponds to the duration of the current under the data segment.

[0222] In some embodiments, the backlight control method further includes:

[0223] A display panel, controlling the flipping of the liquid crystal molecules based on the display data;

[0224] The driving chip drives the light-emitting unit corresponding to the channel to emit light based on the first compensation current under the first compensation data segment before the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel complete the flip from the previous frame to the current frame and / or after the flip from the current frame to the next frame begins.

[0225] The duration of the first compensation current is shorter than the duration of the flipping of the liquid crystal molecules corresponding to the light-emitting unit.

[0226] In some embodiments, the controller includes a first controller and a second controller, and S101 includes:

[0227] The first controller obtains the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame corresponding to the channel;

[0228] The first controller sends the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame to the second controller corresponding to the driver chip where the channel is located;

[0229] The second controller obtains information of the data segment from the previous frame equivalent grayscale to the current equivalent grayscale based on the first corresponding relationship of the data segment;

[0230] The second controller generates the data segment based on the information of the data segment, and sends the data segment to a driver chip corresponding to the second controller.

[0231] In some embodiments, the controller outputs a first PWM signal and a second PWM signal for each channel based on a frame of image, wherein the duty cycle of the first PWM signal is greater than the duty cycle of the second PWM signal, and the amplitudes of the first PWM signal and the second PWM signal are equal.

[0232] The driver chip adjusts the current flowing through the corresponding light-emitting unit based on the duty cycle of the PWM signal. Usually, the duty cycle is proportional to the current.

[0233] In some embodiments, the controller sends the first pulse modulation signal to the light-emitting units in the corresponding backlight group for each sub-display period.

[0234] The controller sends a second pulse modulation signal or outputs a constant first level to the light-emitting units in other backlight groups, wherein the light-emitting units do not operate when receiving the constant first level.

[0235] The first lighting duration of the lighting unit in the backlight group corresponding to the current sub-display period is continuously followed by the second lighting duration of other lighting units.

[0236] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0237] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A display device, characterized in that: The display device includes: A backlight assembly includes at least one driver chip and at least one lamp bead, wherein the at least one lamp bead constitutes a light-emitting unit, and the driver chip includes at least one channel corresponding to the light-emitting unit; A controller coupled to the backlight assembly is configured to: Based on the image data, generating driving data of a current frame of a channel in a driver chip; wherein the driving data of the channel includes a plurality of data segments; The driver chip is configured as follows: For the channel of the driver chip, the current of the light-emitting unit corresponding to the channel is controlled based on the data segments in the driving data of the channel, and the currents in at least two data segments of the multiple data segments are different and non-zero.

2. The display device according to claim 1, wherein The plurality of data segments include a working data segment and at least one compensation data segment, wherein a compensation current in at least one compensation data segment is different from a working current in the working data segment.

3. The display device according to claim 1, wherein The data segments in which the corresponding currents are not zero are continuous among the multiple data segments.

4. The display device according to claim 2, wherein: The image data includes an equivalent grayscale of a pixel unit of a current frame; the at least one compensation data segment includes at least one first compensation data segment; For the light-emitting unit, if the equivalent grayscale of the corresponding pixel unit in the current frame is higher than the equivalent grayscale of the pixel unit in the previous frame, the first compensation current under the first compensation data segment is greater than the operating current; If the equivalent grayscale of the current frame of the corresponding pixel unit is lower than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the first compensation data segment is smaller than the working current.

5. The display device according to claim 2, wherein The at least one compensation data segment includes at least one second compensation data segment; the operating current under the operating data segment is greater than the second compensation current under the second compensation data segment, the second compensation current is not greater than a first threshold; and the second compensation current is not zero; At least one row or column of lamp beads constitutes a light-emitting group, and the lamp beads in the same light-emitting group are scanned simultaneously; the lamp beads in the same light-emitting unit are in the same light-emitting group; The sum of the duration of the second compensation current and the duration of other non-zero currents is not less than the scanning duration; the scanning duration is the ratio of the display period to the number of light-emitting groups.

6. The display device according to claim 4, wherein: The controller is configured to: Based on a frame of image data, the lengths of the working data segment and the compensation data segment are determined; wherein the length of the data segment corresponds to the duration of the current in the data segment.

7. The display device according to claim 6, wherein: The first compensation data segment is continuous with the working data segment; the image data includes display data; the display device further includes a display panel, the display panel includes at least one liquid crystal molecule; the liquid crystal molecule corresponds to the light-emitting unit; the display panel is configured as follows: controlling the liquid crystal molecules to flip based on the display data; The driver chip is configured as follows: Before the liquid crystal molecules corresponding to the light-emitting unit corresponding to the channel complete flipping from the previous frame to the current frame, and / or after the flipping from the current frame to the next frame begins, the light-emitting unit is driven to emit light based on the first compensation current under the first compensation data segment; the duration of the first compensation current is less than the duration of the flipping of the liquid crystal molecules corresponding to the light-emitting unit.

8. The display device according to claim 7, wherein: The number of the first compensation data segments is multiple, For the light-emitting unit, if the equivalent grayscale of the corresponding pixel unit in the current frame is higher than the equivalent grayscale of the pixel unit in the previous frame, the first compensation current under the plurality of first compensation data segments decreases in a direction away from the working current; If the equivalent grayscale of the current frame of the corresponding pixel unit is lower than the equivalent grayscale of the previous frame of the pixel unit, the first compensation current under the plurality of first compensation data segments increases in a direction away from the working current.

9. The display device according to claim 6, wherein: The controller is configured to: For the data segments of the channel, based on the first correspondence between the first grayscale to the second grayscale and the information of the data segments, the information of the data segments from the equivalent grayscale of the previous frame to the equivalent grayscale of the current frame is determined; the information of the data segments includes the length of the data segments; the first correspondence between the multiple data segments is not exactly the same.

10. The display device according to claim 9, wherein The controller includes a first controller and at least one second controller coupled to the first controller; the second controller corresponds to the driver chip, and the second controller stores the first corresponding relationship; The first controller is configured to: For the channel, obtaining the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame of the corresponding pixel unit; Sending the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame to a second controller corresponding to the driver chip where the channel is located; The second controller is configured to: For the data segment, based on the first corresponding relationship of the data segment, obtaining information of the data segment from the previous frame equivalent grayscale to the current equivalent grayscale; Based on the information of the data segment, the data segment is generated, and the data segment is sent to a driver chip corresponding to the second controller.

11. The display device according to claim 5, wherein The sum of the duration of the second compensation current and the duration of other non-zero currents is equal to the display period.

12. The display device according to claim 5, wherein The sum of the duration of the second compensation current and the duration of other non-zero currents is less than the display period.

13. The display device according to claim 5, wherein The sum of the duration of the second compensation current and the duration of other non-zero currents is equal to the scanning duration.

14. A backlight control method, characterized in that: The method is applied to a display device, wherein the display device further includes a backlight assembly and a controller, the backlight assembly being coupled to the controller, the backlight assembly including at least one driver chip and at least one lamp bead, the at least one lamp bead forming a light-emitting unit, the driver chip including at least one channel, the channel corresponding to the light-emitting unit; the method comprising: The controller generates driving data of a current frame of a channel in the driver chip based on the image data; wherein the driving data of the channel includes a plurality of data segments; The controller also sends the driving data of the channel to the corresponding driving chip; The driver chip controls the current of the light-emitting unit corresponding to the channel of the driver chip based on the data segments in the driving data of the channel, and the currents in at least two data segments of the multiple data segments are different and non-zero.

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