Display device and backlight control method thereof

Abstract

The application provides a display device and a backlight control method thereof, comprising: a backlight assembly comprising at least one driving chip and at least one lamp bead, the at least one lamp bead forming a light emitting unit, the driving chip comprising at least one channel, the channel corresponding to the light emitting unit; and a controller coupled to the backlight assembly and configured to generate driving data of a current frame of the channel in the driving chip based on image data, wherein the driving data of the channel comprises a plurality of data segments; and the driving chip is configured to control a current of the light emitting unit corresponding to the channel based on the data segments in the driving data of the channel for the channel, and the currents under at least two data segments of the plurality of data segments are different and not zero. The application can improve the display effect by adjusting the backlight.

Description

Technical Field

[0001] This application relates to the field of display device technology, and more particularly to display devices and backlight control methods thereof. Background Technology

[0002] A display device is a device for displaying images and user interfaces. A display device typically includes at least one controller, a driving circuit, and multiple strings of LEDs for providing backlighting. The driving circuit includes at least one driving chip, and the driving chip includes at least one channel.

[0003] In related technologies, based on black frame insertion (BFI) technology, black frame insertion data segments are set in the driving data of the channel. For each frame, the driver chip turns off the backlight based on the black frame insertion segments, and drives the corresponding LED string to emit light with a constant operating current based on the driving data at other times.

[0004] However, the display effects of the aforementioned technologies are unsatisfactory. Therefore, adjusting the backlight to improve display quality has become a current research hotspot. Summary of the Invention

[0005] This application provides a display device and a backlight control method thereof, which aims to improve the display effect by adjusting the backlight.

[0006] In a first aspect, this application provides a display device, the display device comprising: a backlight assembly including at least one driver chip and at least one LED, the at least one LED forming a light-emitting unit, the driver chip including at least one channel corresponding to the light-emitting unit; a controller coupled to the backlight assembly, configured to: generate driving data of the current frame of a channel in the driver chip based on image data; wherein the driving data of the channel includes multiple data segments; the driver chip is configured to: control the current of the light-emitting unit corresponding to the channel based on the data segments in the driving data of the channel, wherein the current under at least two of the multiple data segments is different and not zero.

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

[0008] In some embodiments, the data segments in which the current is not zero are consecutive among the plurality of data segments.

[0009] In some embodiments, the image data includes the equivalent grayscale of the pixel unit in 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 corresponding pixel unit in the current frame is higher than the equivalent grayscale of the pixel unit in the previous frame, then the first compensation current under the first compensation data segment is greater than the operating current; 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, 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 operating current under the operating data segment is greater than the second compensation current under the second compensation data segment, and the second compensation current is less than a first threshold; the second compensation current is not zero; at least one row or column of LEDs forms a light-emitting group, and the LEDs in the same light-emitting group are scanned simultaneously; the LEDs 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 cycle 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 the data segment corresponds to the duration of the current under that 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 liquid crystal molecule to flip based on the display data; the driving chip is configured to drive the light-emitting unit to emit light based on a first compensation current under the first compensation data segment before the liquid crystal molecule corresponding to the light-emitting unit of the channel ends flipping and / or after flipping begins; the duration of the first compensation current is less than the duration of the liquid crystal molecule flipping corresponding to the light-emitting unit.

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

[0014] In some embodiments, the controller is configured to: for the data segments of the channel, based on a first correspondence between the information of the data segments and the information of the first gray level to the second gray level, determine the information of the data segments from the previous frame equivalent gray level to the current equivalent gray level; the information of the data segments includes the length of the data segments; the first correspondence of the multiple data segments is not completely 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 relationship; the first controller is configured to: for the channel, obtain the 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 relationship of the data segment, obtain 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 scan duration.

[0019] Secondly, this application provides a backlight control method applied to a display device. The display device further includes a backlight assembly and a controller. The backlight assembly is coupled to the controller. The backlight assembly includes at least one driver chip and at least one LED, with the at least one LED forming 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 generating drive data for the current frame of a channel in the driver chip based on image data; wherein the drive data for the channel includes multiple data segments; the controller also sending the drive data for the channel to the corresponding driver chip; and the driver chip controlling the current of the light-emitting unit corresponding to the channel based on the data segments in the drive data of the channel, wherein at least two of the multiple data segments have different and non-zero currents.

[0020] In the display device and backlight control method provided in this application, for each frame, the driving data of a channel is set into multiple data segments. The driving chip controls the current of the backlight group corresponding to that channel based on the data segments. Among the multiple data segments, at least two data segments have unequal currents that are not zero. Since a display cycle of one frame includes at least two unequal current segments, the backlight can be adjusted or compensated by at least one current to adjust or compensate for the other currents, thereby improving the flexibility of backlight adjustment and thus improving the display effect of the display device. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with those of this application and, together with the description, serve to explain the principles of the embodiments of this application.

[0022] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the embodiments of this application in any way, but rather to illustrate the concepts of the embodiments of this application to those skilled in the art through reference to specific embodiments.

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

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

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

[0026] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0027] Figure 5 A schematic diagram of the structure of the channel driving data in an example. Figure 1 ;

[0028] Figure 6 A schematic diagram of the structure of the channel driving data in an example. Figure 2 ;

[0029] Figure 7 A schematic diagram of the structure of the channel driving data in an example. Figure 3 ;

[0030] Figure 8 This is a schematic diagram of the structure of the channel driving data in an example. Figure 4 ;

[0031] Figure 9This is a schematic diagram of the structure of the channel driving data in an example. Figure 5 ;

[0032] Figure 10 This is a schematic diagram of the structure of the channel driving data in an example. Figure 6 ;

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

[0034] Figure 12 This is a timing diagram of the scanning of each light-emitting unit in an example;

[0035] Figure 13 This is a schematic diagram of another display device provided in an embodiment of this application;

[0036] Figure 14 This is a timing diagram of the scanning of each light-emitting unit in another example;

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

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

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

[0040] Figure 18 This is a schematic diagram of the structure of the channel driving data in an example. Figure 7 ;

[0041] Figure 19 This is a schematic flowchart of the backlight control method provided in an embodiment of this application.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this 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 convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0045] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities and do not necessarily imply a specific order or sequence, unless otherwise indicated. It should be understood that such terms can be used interchangeably where appropriate, for example, to implement the application in a sequence other than those given in the embodiments illustrated or described herein.

[0046] Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to be inclusive but not exclusive. For example, a product or device that includes a series of components is not necessarily limited to those explicitly listed, but may include other components not explicitly listed or inherent to such product or device. As used in this application, the term "circuit" means any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code capable of performing the functions associated with that element.

[0047] Figure 1 This is a schematic diagram illustrating an operational 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 control. Communication between the remote control and the display device includes infrared protocol communication, Bluetooth protocol communication, and other short-range communication methods, controlling the display device 200 wirelessly or via wired means. Users can control the display device 200 by inputting user commands through buttons on the remote control, voice input, control panel input, etc.

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

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

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

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

[0053] Figure 2 This is a schematic diagram of the structure 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, and perform format conversion, timing control and other processing on the backlight data and display data before outputting them.

[0055] In some embodiments, the controller 250 may include a system-on-chip (SOC) controller configured to obtain video input signals or image input signals (hereinafter referred to as input signals) from an external input port or a network port, and perform operations such as format conversion, data processing, and image rendering on the input signals.

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

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

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

[0059] In some embodiments, the display device 200 includes a display panel 10 coupled to a controller 250. 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, which is coupled to a controller 250. The backlight assembly 20 is configured to emit light based on driving data. The display panel 10 can display an image based on the backlight provided by the backlight assembly 20.

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

[0062] In some embodiments, the backlight assembly 20 further includes a lamp board 30, which includes an array of lamp beads 301. At least one lamp bead is electrically connected to form a backlight group. 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 assembly, at least one LED chip is connected in series to form a light string;

[0064] In other embodiments, at least one LED chip is connected in parallel in the backlight assembly;

[0065] In other embodiments, in the backlight assembly, at least one LED bead is connected in series to form a light string, and at least one light string is connected in parallel.

[0066] Among them, the light string is a light string composed of light beads connected from left to right or from right to left, or it can be a light string composed from top to bottom or bottom to top, or it can be a light string composed of light beads connected in a preset order (e.g., rotation, bending, etc.).

[0067] The LEDs can be composed of MiniLED, MicroLED, WLED, RGB-LED, GB-rLED or QLED (quantum dot).

[0068] A schematic diagram of the physical structure of the backlight assembly 20 and the display panel 10 is shown below. Figure 3 As shown, the display panel 10 is positioned above the backlight assembly, and the display panel 10 can display an image on its upper side.

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

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

[0071] In some embodiments, the backlight assembly 20 includes a reflective sheet 404 configured to reflect the backlight of the lamp plate toward the diffuser plate direction;

[0072] In some embodiments, the backlight assembly 20 includes: a bracket 403 configured to support a diffuser plate 402, a diaphragm 401, etc., to maintain the optical spacing between the lamp plate 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 diffuser plate 402 are configured to improve the reflection efficiency of the backlight generated by the backlight assembly, guide light uniformly, 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 as follows: diaphragm 401, diffuser plate 402, bracket 403, reflector 404, lamp plate 30, and back plate 407.

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

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

[0079] The lamp board 30 is electrically connected to the driving circuit, which includes one or more driving chips. Each driving chip in each zone receives the processed backlight data sent by Bcon or Dcon, and drives the corresponding LED to emit light based on the processed backlight data, thereby realizing local backlight control of the backlight component, i.e., realizing local dimming. This enables more precise regional light control and makes the screen brightness more uniform and harmonious.

[0080] In some embodiments, the driver chip includes one or more channels, each channel being connected to a light-emitting unit. The driver chip drives the backlight group corresponding to each channel to emit light based on the driving data corresponding to that channel. The light-emitting unit corresponding to each channel is a partition, and the light-emitting unit corresponding to each channel is controlled independently, which further refines the partitioning and improves the backlight adjustment accuracy.

[0081] In some embodiments, the backlight assembly is a string of lights comprising one or more LEDs connected in series.

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

[0083] The switching of images between two consecutive frames is achieved by the flipping of liquid crystal molecules. During the flipping process, the image shows the change between the two frames, which can cause ghosting. To address this, the backlight is turned off to display black between two frames. When the liquid crystal molecules of the next frame have flipped into place, the backlight is turned on. In this way, the two consecutive frames are displayed directly without showing the change process, thus reducing ghosting. This is also known as black frame insertion technology.

[0084] However, the display effect of the above-mentioned solutions is not good. For example, the backlight brightness is very low due to the presence of blackout periods. Therefore, adjusting the backlight to improve the display effect has become a hot research topic.

[0085] To address the aforementioned issues, the display device provided in this application sets the driving data of a channel into multiple data segments for each frame. The driving chip controls the current of the light-emitting unit corresponding to that channel based on the data segments. Among these multiple data segments, at least two segments have unequal and non-zero currents. Since a display cycle of one frame 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, improving the flexibility of backlight adjustment and thus enhancing the display effect of the display device.

[0086] The technical solutions of this application will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. In the description of this application, unless otherwise expressly specified and limited, the terms should be broadly understood within the art. The embodiments of this application will now be described with reference to the accompanying drawings.

[0087] In some embodiments, Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application, such as... Figure 4 As shown, the backlight assembly 20 of the display device includes at least one driver chip 202 and at least one LED.

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

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

[0090] In some embodiments, at least one LED chip constitutes a light-emitting unit 205.

[0091] In some embodiments, the LEDs 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, which corresponds to the light-emitting unit 205.

[0093] In some embodiments, channel 204 corresponds one-to-one with light-emitting unit 205.

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

[0095] The image data can be either the data before image processing or the data after processing using image processing techniques.

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

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

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

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

[0100] Figure 5 This is a schematic diagram of the structure of the channel driving data in an example. Figure 1 ,like Figure 5 As shown, the drive data of channel 204 in one frame may include multiple PWM signals, such as data segment 1 and data segment 2, or may 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 segments in the driving data of the channel 204, wherein the current under at least two of the multiple data segments is different and not zero.

[0102] In other words, in this embodiment, the light-emitting unit corresponding to the channel is driven by at least two non-zero current segments during the display cycle of one frame. (Refer to...) 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 cycle of a frame includes at least two unequal currents, the backlight can be adjusted or compensated by at least one current to adjust or compensate for the other currents, thereby improving the flexibility of backlight adjustment and thus 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, wherein the compensation current under at least one compensation data segment is different from the working current under the working data segment.

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

[0106] The operating current is the current required for the image in the current frame, which can be used to determine the equivalent grayscale based on 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 working data segment ensures the image display, while the compensation current in the compensation data segment adjusts the backlight, improving the display effect.

[0107] In some embodiments, the controller 250 is configured to determine the lengths of a working data segment and a 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 that data segment.

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

[0109] In other words, in this embodiment, the duration of each current segment is determined based on the image data of the current frame. The duration of each segment can be different, which allows for further control of the backlight 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 this configuration, the length of data segment 1 is longer than the length of data segment 3. This reduces overcompensation.

[0112] In some embodiments, data segments in which the corresponding current is not zero are consecutive.

[0113] Continue to refer to Figure 5 Data segments 1 and 2, where the current is not zero, are continuous, while the current in data segment 3 is zero, which is the blackout period.

[0114] In this embodiment, the non-zero current is continuous, which, compared with the scheme of inserting a light-emitting period into the black-insertion period, can increase the duration of the black-insertion period, thereby improving the black-insertion effect.

[0115] In some embodiments, image data includes the equivalent grayscale of pixel units in the 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 the grayscale corresponding to each light may be different. In this embodiment, the equivalent grayscale is the equivalent grayscale after the combination of the three light sources.

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

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

[0119] If the equivalent gray level of the corresponding pixel unit in the current frame is higher than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the first compensation data segment is less than the operating current.

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

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

[0122] Figure 6 Schematic diagram of the driving data for the channel 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 smaller than that of the previous frame (the first frame). In the second frame, the current I1 under data segment 1 is smaller than the current I2 under data segment 2. The equivalent grayscale of the third frame is larger than that of the previous frame (the second frame). In the third frame, the current I1 under data segment 1 is larger than the current I2 under data segment 2.

[0123] Because the light-emitting units turn off during blackout periods, the backlight brightness decreases during a single display frame. In this embodiment, based on the equivalent grayscale of the image, the corresponding light-emitting units are controlled and compensated within one cycle using a first compensation current, thereby extending the backlight's on-time and ensuring both display quality and 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 this case, data segment 1 and data segment 2 are continuous, which reduces the impact of the corresponding black insertion effect.

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

[0127] In some embodiments, a 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, image data includes display data, which includes equivalent grayscale.

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

[0131] In some embodiments, the duration of the first compensation current is less than the duration of the liquid crystal molecule flipping corresponding to the light-emitting unit. This allows for a blackout period.

[0132] In some embodiments, 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 of the channel finish flipping 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 start time of the flipping is in the previous frame, and the end time is in the next frame. To achieve BFI black insertion technology, the operating current drives the light-emitting unit to emit light when the liquid crystal molecule corresponding to the light-emitting unit has flipped into position. In this embodiment, the first compensation data segment is continuous with the operating data segment. The driving chip emits light based on the first compensation current before the corresponding liquid crystal molecule finishes flipping. Therefore, it can be seen that in this embodiment, the first compensation current is located before the operating current and does not shorten the duration of the operating current.

[0134] For example, Figure 7 This is a schematic diagram of the structure of the channel driving data in an example. Figure 3 ,like Figure 7 As shown, data segment 2 is the working data segment, and data segment 3 is the first compensation data segment. 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 four data segments, of which data segments 1 and 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 molecule ends its flip from the previous frame to the current frame, and point B is the point where the corresponding liquid crystal molecule begins its flip from the current frame to the next frame. The AB segment can be understood as the period when the liquid crystal molecule is stable, 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 some other embodiments, 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 after the liquid crystal molecule corresponding to the light-emitting unit of the channel begins its flip from the current frame to the next frame.

[0135] In this embodiment, the first compensation current is located after the operating current. For example, Figure 8 This is a schematic diagram of the structure of the channel driving data in an example. Figure 4 ,like Figure 8 As shown, the driving data of the current frame includes four data segments. Data segments 1 and 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 molecule ends its flip from the previous frame to the current frame, and point B is the point where the corresponding liquid crystal molecule begins its flip from the current frame to the next frame. The AB segment can be understood as the period when the liquid crystal molecule is stable, 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 of the channel finish flipping from the previous frame to the current frame and after the corresponding liquid crystal molecules start flipping from the current frame to the next frame.

[0137] In other words, in this embodiment, the first compensation current includes multiple segments, which are located on both sides of the operating current and are continuous with it. For example, Figure 9 This is a schematic diagram of the structure of the channel driving data in an example. Figure 5 The figure includes two consecutive frames. The driving data of one frame includes five data segments: data segment 1 and data segment 5 are black insertion data segments, data segment 2 and data segment 4 are first compensation data segments, and data segment 3 is the working data segment, with data segment 2 and data segment 4 located on both sides of data segment 3.

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

[0139] In some embodiments, the first compensation current before the liquid crystal molecule corresponding to the light-emitting unit of the channel ends its flipping is less than the first compensation current after the liquid crystal molecule corresponding to the light-emitting unit of the channel begins its 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 first compensation data segments is multiple.

[0142] In some embodiments, if the equivalent gray level of the current frame of the corresponding pixel unit is higher than the equivalent gray level of the previous frame of the pixel unit, the first compensation current under multiple first compensation data segments decreases in the direction away from the operating current.

[0143] In some embodiments, if the equivalent gray level of the current frame of the corresponding pixel unit is lower than the equivalent gray level 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 operating current.

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

[0145] In this embodiment, multiple first compensation currents that gradually approach the operating current are used to reduce the leap between multiple currents, thereby improving the stability of the backlight.

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

[0147] In other words, for each data segment, a first correspondence between its own G1-G2 and the information of that data segment will be established.

[0148] It should be noted that for each combination of G1-G2, a first correspondence can be established with each data segment. For example, in the example including 32 equivalent gray levels, any two equivalent gray levels from 0-31 can be permuted and combined, and for each combination, a first correspondence can be established with each data segment. Different data segments can establish different first correspondences for the same combination.

[0149] In some embodiments, the first correspondence of multiple data segments is not exactly the same.

[0150] It is understandable that the current values ​​of data segments with the same first correspondence are equal. Similarly, the current values ​​of data segments with different first correspondences are not the same.

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

[0152] It is known that the longer the data segment, the longer the corresponding current duration. The flip-flop time for different equivalent grayscale changes can vary. A larger equivalent grayscale change corresponds to a longer flip-flop 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 embodiments where the data segment includes a PWM signal, the data segment information also includes the duty cycle and amplitude of the PWM signal, in order to determine the corresponding current value.

[0154] As can be seen from the above embodiments, the start time of the working current corresponding to the working data segment is the time when the corresponding liquid crystal molecule ends its flipping, and the end time of the working current is the time when the corresponding liquid crystal molecule begins its 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 start and end times of the current under the first compensation data segment can be determined. In other words, the current value and duration of each segment of the current 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. The controller 250 stores a first correspondence relationship and 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 may store one copy of the correspondence relationship.

[0156] In some embodiments, 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; the second controller stores a first correspondence. That is, each second controller stores a copy of the first correspondence.

[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 gray level of the current frame and the equivalent gray level 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 driver chip 202 where the channel is located.

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

[0163] For a data segment, based on the first correspondence of the data segment, information about the data segment from the equivalent gray level of the previous frame to the current equivalent gray level is obtained;

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

[0165] In other words, multiple driver chips share a single first controller. The first controller only needs to send the equivalent grayscale data to the corresponding second controller of the driver chip. Since the equivalent grayscale data is relatively small, the transmission burden is low. The second controller is responsible for generating and sending multiple data segments based on the first correspondence. The second controller corresponds one-to-one with each driver chip, and it transmits larger data segments in a one-to-one manner. Compared to the one-to-many method used in the previous example, this embodiment has higher transmission efficiency.

[0166] In some embodiments, the display device uses row scanning or column scanning technology, meaning that each element in the same light-emitting group is illuminated sequentially. The display device also includes a power supply circuit 13, which may be a power board. Figure 11 Here is a schematic diagram of the device structure in another example, such as Figure 11 As shown, taking line scanning as an example, the power supply circuit 13 is connected to the light-emitting units in each light-emitting group 206, where the LEDs under the same light-emitting unit 205 are located in the same light-emitting group. The LEDs in the same light-emitting unit are lit simultaneously. The controller 250 controls the current supplied by the power supply circuit 13 to each light-emitting unit by sending driving data to the corresponding driver chip 202. Different light-emitting units are connected in parallel.

[0167] In related technologies, for the light-emitting unit, before the corresponding liquid crystal molecules flip into position, the driver chip 202 controls the current of the light-emitting unit to be zero to achieve backlight shutdown. 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 on-time, the better the effect of reducing trailing.

[0168] Figure 12 This is a timing diagram illustrating the scanning of each light-emitting unit in an example, such as... Figure 12 As shown, when the on-time Ton of each light-emitting unit is shortened to a certain duration, the total current will be zero for a period of time. In this case, the power board needs to output intermittent current. The power board usually includes an LLC resonant circuit, and 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 limitations of the power board performance, it is not possible to further reduce the ghosting, resulting in poor effect in reducing the ghosting phenomenon.

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

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

[0171] In some embodiments, the operating 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 not greater than the first threshold; the second compensation current is not zero.

[0172] The first threshold corresponds to a relatively small equivalent gray level. In other words, the equivalent gray level corresponding to the second compensation current is small, approximately zero.

[0173] In some embodiments, the second compensation current is a fixed value less than the first threshold. That is, the second compensation current is the same in every frame. This reduces the computational burden on the controller.

[0174] In other embodiments, the ratio of the second compensation current to the operating current is a first value, wherein 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, then the first threshold is used as the second compensation current of the current frame. Conversely, if the obtained second compensation current is not greater than the first threshold, then the obtained second compensation current is used as the second compensation current of the current frame.

[0176] In some embodiments, the second compensation current is set based on the minimum current that the power board can respond to 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 for timely response. For example, the minimum current I for timely response of the power board is given by n light-emitting groups and m light-emitting units in each light-emitting group. Then the second compensation current I... 补 =I / nm.

[0178] In some embodiments, the LEDs in the same light-emitting unit are located in the same light-emitting group. That is, the LEDs corresponding to the same light-emitting unit are either turned off or turned on simultaneously.

[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 scan duration; the scan duration is the ratio of the display period to the number of light-emitting groups.

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

[0181] For example, if the monitor's scanning frequency (also known as the image refresh rate) is 120Hz, and one row of LEDs corresponds to one light-emitting group, and the number of rows of LEDs in the backlight assembly is 6, then the scanning duration = 1 / 120 / 6 = 1.39µs. In other words, the sum of the duration of the second compensation current and the duration of the other non-zero currents is not less than 1.39µs.

[0182] In some embodiments, other non-zero currents include operating current.

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

[0184] In this embodiment, the current in each channel includes a second compensation current less than the first threshold. The equivalent grayscale corresponding to the second compensation current is lower, and the LEDs driven by the second compensation current can approximate a pseudo-black insertion state. That is to say, in each display cycle, the black insertion effect is maintained under the action of the second compensation current, while ensuring that the total current does not fall below the minimum current required for timely response by the power board. In this way, the power board will always maintain a stable working state, and the duration of the operating current can be decoupled from the limitations of the power board performance. Therefore, the duration of the operating current can be further reduced, thereby further reducing the trailing phenomenon and improving the display quality of the image.

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

[0186] Explain using real-world scenarios. Figure 13 A schematic diagram of another device provided in the embodiments of this application is shown below. Figure 13 As shown, for ease of description, the duration of any other non-zero current is defined as the first illumination duration, and the duration of the second compensation current is defined as the second illumination duration. t1-t7 represents one display cycle. Taking a light-emitting group consisting of a row of LEDs as an example, in the first row of light-emitting units, t1'-t1 is the first illumination duration of the first row of light-emitting unit 1, which is also known as Ton in related technologies. t6-t1' is the second illumination duration of the first row of light-emitting unit 1. The sum of the first and second illumination durations is the display cycle. In other words, each light-emitting unit emits light either based on any other non-zero current or based on the second compensation current. Therefore, only two types of data segments are needed for the light-emitting unit to emit light, thus reducing the control complexity of the controller 250.

[0187] In other embodiments, the sum of the duration of 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 operating current) and the second light-emitting duration (duration of the second compensation current) is less than the display cycle but greater than the scanning duration. Each light-emitting unit includes three time periods within 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 trailing phenomenon when the backlight is completely off. Therefore, compared with the above example, the increased backlight-off duration in this example can improve the black insertion effect, reduce the trailing phenomenon, and further improve the display quality of the image.

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

[0190] To illustrate this, let's look at a real-world scenario: Figure 14 Here is a timing diagram of the scanning of each light-emitting unit in another example, such as Figure 14 As shown, t1-t7 represents one display cycle. Taking this cycle as an example, the display device includes 6 rows of LEDs, with each light-emitting group corresponding to one row of LEDs. The refresh rate is 120Hz, and the scan duration is 1.39µs. In this example, the sum of the first and second light-emitting durations of each light-emitting unit in each light-emitting group equals 1.39s. Taking the second row of light-emitting unit 2 as an example, t2'-t2 is the first light-emitting duration of the second row of light-emitting unit 2, t3-t2' is the second light-emitting duration of the second row of light-emitting unit 2, and t2-t1+t7-t3 is the backlight-off duration of the second row of light-emitting units. It can be understood that the backlight-off duration of each light-emitting unit in this example is the longest. Therefore, the trailing phenomenon can be further reduced in this example.

[0191] The following will provide an exemplary description of a method for controlling corresponding light-emitting units based on multiple data segments in the driving data.

[0192] Take, for example, the above-mentioned compensation data segment including the second compensation data segment.

[0193] In some embodiments, the multiple data segments include a working data segment and a second compensation data segment, wherein 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 one frame of image. The duty cycle of the first PWM signal is greater than that of the second PWM signal; 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, and the duty cycle is usually 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 Here is a timing diagram of the scanning of each light-emitting unit in another example, such as Figure 15 As shown, the second light-emitting duration of each light-emitting unit is continuously connected after the first light-emitting duration, and the second PWM signal is continuously connected after 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 operating 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 connected consecutively after the first PWM signal, making the PWM signals more ordered. Therefore, the controller 250 can easily send the corresponding PWM signals according to the corresponding timing sequence.

[0200] In other examples, multiple light-emitting groups are divided into a first number of backlight groups. The display cycle includes a first number of sub-display cycles, and the first and second light-emitting durations of the same light-emitting unit are located 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 LEDs. The first to third rows are the first backlight group, the fourth to sixth rows are the second backlight group, and the sixth row is the third backlight group. These three backlight groups correspond to the first, second, and third sub-display cycles, respectively. Each sub-display cycle is equal to the ratio of the display cycle to the first number. For example, if the display cycle of the device is 1 / 120µs, then each sub-display cycle is equal to 1 / 360µs.

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

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

[0204] The system sends a second pulse modulation signal or outputs a constant first level to the light-emitting units in the other backlight groups. The light-emitting units do not operate when receiving the constant first level.

[0205] The first light-emitting duration of the backlight unit in the current sub-display cycle is followed by the second light-emitting duration of other light-emitting units.

[0206] The following will illustrate this with a practical example: Figure 16 Here is a timing diagram of the scanning of each backlight group in another example, such as Figure 16 As shown, taking line scanning as an example, the display device includes 6 light-emitting groups, each corresponding to one row LED. The light-emitting units in the first to third rows form the first backlight group, the light-emitting units in the fourth to fifth rows form the second backlight group, and the light-emitting units in the sixth row form the third backlight group. The first, second, and third backlight groups correspond to the first, second, and third sub-display cycles, respectively. During the first sub-display cycle, the controller 250 sends a first PWM signal to the light-emitting units in the corresponding first backlight group, causing the light-emitting units in the first to third rows to light up sequentially with operating current. A second PWM signal or a 0-level signal is sent to each light-emitting unit in the second and third backlight groups. The second light-emitting duration of other light-emitting units is continuously connected after the first light-emitting duration of each light-emitting unit in the first backlight group.

[0207] For example, the first illumination duration of the first row of light-emitting units is followed by the second illumination duration of the fifth row of light-emitting units, and the first illumination duration of the second row of light-emitting units is followed by the second illumination duration of the sixth row of light-emitting units. In the second sub-display cycle, the controller 250 sends a first PWM signal to each light-emitting unit in the corresponding second backlight group within its first illumination duration, and sends a second PWM signal or a 0-level signal to the light-emitting units in the first and third backlight groups. Furthermore, the second illumination duration of other light-emitting units is consecutively connected after the first illumination duration of the light-emitting units in the second backlight group, such as the second illumination duration of the second row of light-emitting units following the first illumination duration of the fourth row of light-emitting units. Then, in the third sub-display cycle, the controller 250 sends a first PWM signal within the first illumination 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 outputting two PWM signals with different duty cycles within the same cycle is quite challenging for the controller 250. Therefore, in the example where the first and second illumination durations are consecutive, the requirements for the controller 250 are high, resulting in higher costs. In this example, however, the first and second illumination durations of the same light-emitting unit are located in different sub-display cycles, so only one PWM signal is output in each cycle. Thus, this example reduces the requirements for the 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 each LED bead in the first second quantity row, and the second backlight group includes the last first quantity minus the second quantity, the second quantity being the ratio of the sum of the first quantity plus one to two.

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

[0211] In the second sub-display cycle, the second light-emitting duration of the light-emitting units in the first backlight group (excluding the last row) is followed by the first light-emitting duration of the light-emitting units in the corresponding row of the second backlight group.

[0212] To illustrate this, let's look at a real-world scenario: Figure 17 Here is a timing diagram of the scanning of each backlight group in another example, such as Figure 17 As shown, the display device includes 5 rows of light-emitting groups, each corresponding to a row of LEDs. The corresponding second quantity is (5+1) / 2 = 3. Therefore, 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. Thus, 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 cycle, 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 unit in the first row, it continuously sends a second PWM signal to the corresponding fourth light-emitting unit, and after sending the first PWM signal to the light-emitting unit in the second row, it continuously sends a second PWM signal to the corresponding fifth light-emitting unit. In the second sub-display cycle, the controller 250 sends the first PWM signal to the light-emitting units in the fourth to fifth rows and the second PWM signal to the light-emitting units in the first to third rows. After receiving the second PWM signal, the light-emitting unit in the first row continuously sends the first PWM signal to the light-emitting unit in the corresponding fourth row, and after sending the second PWM signal to the light-emitting unit in the second row, continuously sends the first PWM signal to the light-emitting unit in the corresponding fifth row.

[0213] It is understandable that the more sub-display cycles there are, the more control signals the controller 250 sends, and the more complex the controller 250's processing becomes. However, in this example, two sub-display cycles are used and divided into two backlight groups, which further reduces the difficulty of signal processing for 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 A schematic diagram of the structure of the channel driving data in an example. Figure 7 ,like Figure 18 As shown, the channel's drive data includes five data segments, where 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 cycles of each data segment, from high to low, are data segment 4, data segment 2, data segment 3, data segment 1, and data segment 5, and the corresponding currents decrease sequentially.

[0216] The data segment in this embodiment includes 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 in this application is as follows: Figure 19 As shown, it includes:

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

[0219] S102, the controller also sends the drive data of the channel to the corresponding drive chip;

[0220] S103. The driver chip controls the current of the light-emitting unit corresponding to the channel based on the data segments in the driving data of the channel, wherein the current under at least two of the multiple data segments is different and not 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 that data segment.

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

[0223] The display panel controls the flipping of liquid crystal molecules based on the display data;

[0224] The driving chip drives 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 of the channel finish flipping from the previous frame to the current frame, and / or after the flipping from the current frame to the next frame begins.

[0225] Wherein, the duration of the first compensation current is less than the duration of the liquid crystal molecule flipping corresponding to the light-emitting unit.

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

[0227] For the channel, the first controller obtains the equivalent grayscale of the current frame and the equivalent grayscale of the previous frame.

[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, for the data segment, obtains information about the data segment from the previous frame's equivalent grayscale to the current equivalent grayscale based on the first correspondence relationship of the data segment;

[0230] The second controller generates the data segment based on the information in the data segment and sends the data segment to the 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 one frame of image. The duty cycle of the first PWM signal is greater than that of the second PWM signal; 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 cycle.

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

[0235] The first light-emitting duration of the backlight unit in the current sub-display cycle is followed by the second light-emitting duration of other light-emitting units.

[0236] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0237] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of 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 LED, wherein the at least one LED forms a light-emitting unit, and the driver chip includes at least one channel, wherein the channel corresponds to the light-emitting unit. The controller coupled to the backlight assembly is configured to: Based on image data, drive data for the current frame of a channel in the driver chip is generated; wherein the drive data for the channel includes multiple data segments. The driver chip is configured as follows: For the channel of the driver chip, based on the data segments in the driving data of the channel, the current of the light-emitting unit corresponding to the channel is controlled, wherein the current under at least two of the multiple data segments is different and not zero; The plurality of data segments include a working data segment and at least one compensation data segment, wherein the compensation current under at least one compensation data segment is different from the working current under the working data segment. The data segments in which the current is not zero are consecutive among the plurality of data segments; The image data includes the equivalent grayscale of the pixel units in 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 gray level of the corresponding pixel unit in the current frame is higher than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the first compensation data segment is greater than the operating current. If the equivalent gray level of the corresponding pixel unit in the current frame is lower than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the first compensation data segment is less than the operating current.

2. The display device according to claim 1, characterized in that, 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, and the second compensation current is not greater than the first threshold; the second compensation current is not zero. At least one row or column of LED beads constitutes a light-emitting group, and the LED beads in the same light-emitting group are scanned simultaneously; the LED 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 the other non-zero currents is not less than the scan duration; the scan duration is the ratio of the display cycle to the number of light-emitting groups.

3. The display device according to claim 2, characterized in that, 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 under that data segment.

4. The display device according to claim 3, characterized in that, 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 including at least one liquid crystal molecule; the liquid crystal molecule corresponds to the light-emitting unit; the display panel is configured as follows: The liquid crystal molecules are controlled to flip based on the displayed data; The driver chip is configured as follows: Before the liquid crystal molecules corresponding to the light-emitting unit of the channel finish 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.

5. The display device according to claim 4, characterized in that, The number of the first compensation data segments is multiple. For the light-emitting unit, if the equivalent gray level of the corresponding pixel unit in the current frame is higher than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the plurality of first compensation data segments decreases in the direction away from the working current. If the equivalent gray level of the corresponding pixel unit in the current frame is lower than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the plurality of first compensation data segments increases in the direction away from the operating current.

6. The display device according to claim 3, characterized in that, The controller is configured to: For the data segments of the channel, based on the first correspondence between the first gray level to the second gray level and the information of the data segments, the information of the data segments under the equivalent gray level of the previous frame to the equivalent gray level 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 completely the same.

7. The display device according to claim 6, characterized in that, 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 relationship; The first controller is configured as follows: For the channel, obtain the equivalent grayscale of the corresponding pixel unit in the current frame and the equivalent grayscale of the previous frame; The equivalent grayscale of the current frame and the equivalent grayscale of the previous frame are sent to the second controller corresponding to the driver chip where the channel is located. The second controller is configured as follows: For the data segment, based on the first correspondence of the data segment, information of the data segment from the equivalent gray level of the previous frame to the current equivalent gray level is obtained; Based on the information in the data segment, the data segment is generated and sent to the driver chip corresponding to the second controller.

8. The display device according to claim 2, characterized in that, The sum of the duration of the second compensation current and the duration of the other non-zero currents equals the display period.

9. The display device according to claim 2, characterized in that, The sum of the duration of the second compensation current and the duration of the other non-zero currents is less than the display period.

10. The display device according to claim 2, characterized in that, The sum of the duration of the second compensation current and the duration of the other non-zero currents is equal to the scan duration.

11. A backlight control method, characterized in that, The method is applied to a display device, the display device further comprising a backlight assembly and a controller, the backlight assembly being coupled to the controller, the backlight assembly comprising at least one driver chip and at least one LED, the at least one LED forming a light-emitting unit, the driver chip comprising at least one channel, the channel corresponding to the light-emitting unit; the method comprising: The controller generates driving data for the current frame of a channel in the driver chip based on image data; wherein the driving data for the channel includes multiple data segments. The controller also sends the channel's drive data to the corresponding drive chip; The driver chip controls the current of the light-emitting unit corresponding to the channel based on the data segments in the driving data of the channel. The current under at least two of the multiple data segments is different and not zero. The plurality of data segments include a working data segment and at least one compensation data segment, wherein the compensation current under at least one compensation data segment is different from the working current under the working data segment. The data segments in which the corresponding current is not zero are consecutive; 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 gray level of the corresponding pixel unit in the current frame is higher than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the first compensation data segment is greater than the operating current. If the equivalent gray level of the corresponding pixel unit in the current frame is lower than the equivalent gray level of the pixel unit in the previous frame, then the first compensation current under the first compensation data segment is less than the operating current.

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