Backlight dimming method, device, system, backlight module and display device

Abstract

The present disclosure provides a backlight dimming method, device, system, backlight module and display device, which receives the dimming information of the current image frame sent by the system chip in the dimming stage, splits the initial dimming data based on the target dimming data type to obtain the intermediate dimming data corresponding to the target dimming data type, processes the intermediate dimming data corresponding to the target dimming data type to obtain the target dimming data frame when the target dimming data type is one of DC dimming and PWM dimming, and sends the target dimming data frame to the backlight driving chip to dim the LED backlight source with the target dimming data frame. In the backlight dimming system, one of the PWM dimming data and the DC dimming data can be transmitted at a time, the bandwidth efficiency can be improved, the data redundancy can be reduced, the amount of data transmitted in a single frame time can be reduced, and the backlight response lag can be avoided.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of backlight dimming technology, and more particularly to a backlight dimming method, apparatus, system, backlight module, and display device. Background Technology

[0002] In display panels, sub-millimeter light-emitting diode (Mini LED) backlight modules typically employ a hybrid dimming technology that combines direct current (DC) dimming and pulse width modulation (PWM) dimming. This allows for precise brightness control of the LED backlight and achieves high dynamic range (HDR) display effects. Specifically, in medium-to-high brightness scenarios, the DC dimming data is relatively fixed, and only PWM dimming data is actually used for dimming; conversely, in low brightness scenarios, the PWM dimming data is also relatively fixed, and only DC dimming data is used for dimming.

[0003] However, regardless of whether the actual requirement is DC dimming data or PWM dimming data, both types of data must be provided to the backlight driver chip simultaneously, resulting in low bandwidth efficiency, severe data redundancy, and delayed backlight response. Summary of the Invention

[0004] This disclosure provides a backlight dimming method, apparatus, system, backlight module, and display device, which are capable of...

[0005] In a first aspect, this disclosure provides a backlight dimming method, including: During the dimming stage, dimming information of the current image frame sent by the system-on-a-chip is received. The dimming information includes a target dimming data type and initial dimming data. The initial dimming data is split based on the target dimming data type to obtain intermediate dimming data corresponding to the target dimming data type. When the target dimming data type is either DC dimming or PWM dimming, the intermediate dimming data corresponding to the target dimming data type is processed to obtain a target dimming data frame. The target dimming data frame includes a dimming data type flag bit, which is used to identify the target dimming data type. The target dimming data frame is sent to the backlight driver chip so that the backlight driver chip dims the LED backlight based on the target dimming data frame.

[0006] In some embodiments of this disclosure, before processing the intermediate dimming data corresponding to the target dimming data type, the method further includes: Obtain the protocol command, which includes the encoding method corresponding to the target dimming data type; parse the protocol command to obtain the encoding method corresponding to the target dimming data type, and determine whether the protocol command includes the encoding method corresponding to a non-target dimming data type.

[0007] In some embodiments of this disclosure, processing the intermediate dimming data corresponding to the target dimming data type includes: When it is determined that the protocol command does not include the encoding method corresponding to the non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data; a dimming data type flag bit is set before the most significant bit of the target dimming data; the dimming data type flag bit is set to a target value to identify the target dimming data type; the target dimming data with the dimming data type flag bit is encapsulated into the target dimming data frame.

[0008] In some embodiments of this disclosure, encapsulating the target dimming data, which includes a dimming data type flag, into a target dimming data frame includes: A padding bit is set after the least significant bit of the target dimming data; the padding bit is set as dither data / padding data to obtain the target dimming data frame.

[0009] In some embodiments of this disclosure, before sending the target dimming data frame to the backlight driver chip, the method further includes: When it is determined that the protocol command includes the encoding method corresponding to the non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data; the intermediate dimming data corresponding to the non-target dimming data type is encoded according to the encoding method corresponding to the non-target dimming data type to obtain the non-target dimming data; the target dimming data and the non-target dimming data are merged and encapsulated into the target dimming data frame.

[0010] In some embodiments of this disclosure, before sending the target dimming data frame to the backlight driver chip, the method further includes: When the target dimming data type includes DC dimming and PWM dimming, the intermediate DC dimming data is encoded according to the DC dimming data encoding method to obtain the target DC dimming data; the intermediate PWM dimming data is encoded according to the PWM dimming data encoding method to obtain the target PWM dimming data; the target DC dimming data and the target PWM dimming data are merged and encapsulated into the target dimming data frame, the target dimming data frame includes a null character bit, and the least significant bit of the null character bit is multiplexed as the dimming data type flag bit.

[0011] In some embodiments of this disclosure, the method further includes: During the initialization phase, the initial values ​​of DC dimming data and PWM dimming data are broadcast to the backlight driver chip so that the backlight driver chip sets the initial brightness of the LED backlight based on the initial values ​​of the DC dimming data and the initial values ​​of the PWM dimming data.

[0012] Secondly, this disclosure provides a backlight dimming device, comprising: A receiving module is used to receive dimming information of the current image frame sent by the system-on-a-chip during the dimming stage. The dimming information includes a target dimming data type and initial dimming data. A splitting module is used to split the initial dimming data based on the target dimming data type to obtain intermediate dimming data corresponding to the target dimming data type. A processing module is used to process the intermediate dimming data corresponding to the target dimming data type when the target dimming data type is either DC dimming or PWM dimming to obtain a target dimming data frame. The target dimming data frame includes a dimming data type flag bit, which is used to identify the target dimming data type. A sending module is used to send the target dimming data frame to the backlight driver chip so that the backlight driver chip dims the LED backlight based on the target dimming data frame.

[0013] Thirdly, this disclosure provides a backlight dimming system, including a system-on-a-chip, a backlight controller, and a backlight driver chip; the system-on-a-chip is used to analyze the dimming requirements of the current frame and obtain the dimming information of the current frame; the backlight controller is used to execute any of the methods provided in the first aspect.

[0014] Fourthly, this disclosure provides a backlight module, including an LED backlight source and a backlight dimming system provided in the third aspect.

[0015] Fifthly, this disclosure provides a display device, including a display panel and a backlight module provided in the fourth aspect.

[0016] In the technical solution of this disclosure embodiment, during the dimming stage, dimming information of the current image frame sent by the system-on-a-chip is received. The initial dimming data is split based on the target dimming data type to obtain intermediate dimming data corresponding to the target dimming data type. When the target dimming data type is either DC dimming or PWM dimming, the intermediate dimming data corresponding to the target dimming data type is processed to obtain the target dimming data frame. The target dimming data frame is sent to the backlight driver chip so that the backlight driver chip dims the LED backlight with the target dimming data frame. This allows for the single transmission of either PWM dimming data or DC dimming data in the backlight dimming system, which can improve bandwidth efficiency, reduce data redundancy, and reduce the amount of data transmitted in a single frame time to avoid backlight response lag.

[0017] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. It should be understood that the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure, wherein: Figure 1 A schematic diagram of hybrid dimming data provided by existing technology.

[0019] Figure 2 This is a schematic diagram of a backlight dimming system provided in an embodiment of the present disclosure.

[0020] Figure 3 This is a schematic flowchart of a backlight dimming method provided in an embodiment of the present disclosure.

[0021] Figure 4 This is a schematic diagram of a target dimming data frame provided in an embodiment of the present disclosure.

[0022] Figure 5 This is a schematic diagram of a backlight dimming device provided in an embodiment of the present disclosure. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are also within the scope of protection of this disclosure.

[0024] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this subject matter pertains. It will be further understood that terms such as those defined in commonly used dictionaries shall be interpreted as having the meaning consistent with their meaning in the context of the specification and in the relevant art, and shall not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, the statement “connecting” two or more parts together shall mean that the parts are joined directly together or joined through one or more intermediate components.

[0025] In this disclosure, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this disclosure can be combined with other embodiments.

[0026] Furthermore, the terms "first," "second," etc., in the specification, claims, or the accompanying drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0027] In this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] In the description of this disclosure, unless otherwise stated, "multiple" and "at least two" mean two or more (including two), and similarly, "multiple groups" and "at least two groups" mean two or more (including two groups).

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0030] In existing hybrid dimming technologies, each transmitted hybrid dimming data includes DC dimming data and PWM dimming data. For dimming requirements exceeding 22 bits, the hybrid dimming data is often no less than 32 bits. For example, the hybrid dimming data includes a 6-bit null character, 10 bits of DC dimming data, and 16 bits of PWM dimming data. Figure 1 As shown, Figure 1 A schematic diagram of hybrid dimming data provided by existing technology.

[0031] With the increasing dimming resolution, refresh rate of Liquid Crystal Displays (LCDs), and number of dimming zones on LCDs, the amount of dimming data continues to grow, exacerbating bandwidth bottlenecks. For example, the data bandwidth for a 1000-zone, 180Hz Red Green Blue (RGB) TV is: 1000 3 32 180 = 17,280,000 bits / s. Furthermore, existing backlight communication protocols have a coding efficiency of only 50% to 66.7%, leading to further bandwidth reduction.

[0032] Firstly, during a single dimming operation, both DC dimming data and PWM dimming data must be sent simultaneously. However, in practice, only DC dimming data / PWM dimming data is used for dimming, resulting in low bandwidth efficiency and severe data redundancy.

[0033] Secondly, the massive amount of data cannot be transmitted within a single frame, resulting in a lag in backlight response during dynamic scenes, which in turn affects image quality.

[0034] In view of this, the present disclosure provides a backlight dimming method. During the dimming stage, the dimming information of the current image frame sent by the system-on-a-chip is received. The initial dimming data is split based on the target dimming data type to obtain intermediate dimming data corresponding to the target dimming data type. When the target dimming data type is either DC dimming or PWM dimming, the intermediate dimming data corresponding to the target dimming data type is processed to obtain the target dimming data frame. The target dimming data frame is sent to the backlight driver chip so that the backlight driver chip dims the LED backlight using the target dimming data frame. This method can transmit either PWM dimming data or DC dimming data in a single transmission in the backlight dimming system, which can improve bandwidth efficiency and reduce data redundancy. It can also reduce the amount of data transmitted in a single frame time to avoid backlight response lag.

[0035] The technical solutions of this disclosure are described in detail below with reference to several specific embodiments.

[0036] Figure 2A backlight dimming system provided in this disclosure embodiment, such as Figure 2 As shown, the backlight dimming system includes a system-on-chip (SOC), a backlight controller (BOCN), and a backlight driver integrated circuit (BDIC). The SOC communicates with the BOCN via an inter-integrated circuit (IIC) bus and also via a serial peripheral interface (SPI). The backlight BOCN communicates with the BDIC.

[0037] The SOC processes the current image frame using a Product Quantization (PQ) algorithm to analyze the dimming requirements of the current frame and obtain its dimming information. The BOCN executes the steps of any method embodiment disclosed herein and is responsible for generating and distributing the target dimming data frame. The BDIC receives the target dimming data frame and drives the LED backlight according to the target dimming data frame to dim the LED backlight.

[0038] Figure 3 A backlight dimming method provided in this embodiment of the present disclosure, such as Figure 3 As shown, the specific steps of the backlight dimming method include: S101, during the dimming stage, receives dimming information of the current image frame sent by the SOC.

[0039] For example, the dimming information includes a target dimming data type and initial dimming data. The target dimming data type can be DC dimming and / or PWM dimming, and the initial dimming data includes initial DC dimming data and initial PWM dimming data.

[0040] The SOC uses the PQ algorithm to determine the target dimming data type based on the initial values ​​of DC dimming data, PWM dimming data, the initial DC dimming data values ​​of the current image frame, and the initial PWM dimming data values ​​of the current image frame. Alternatively, it can determine the target dimming data type based on the initial DC dimming data values ​​of the previous image frame, the initial PWM dimming data values ​​of the previous image frame, the initial DC dimming data values ​​of the current image frame, and the initial PWM dimming data values ​​of the current image frame.

[0041] S102, split the initial dimming data based on the target dimming data type to obtain the intermediate dimming data corresponding to the target dimming data type.

[0042] For example, the initial DC dimming data can be separated from the initial dimming data to obtain intermediate DC dimming data, and the initial PWM dimming data can be separated from the initial dimming data to obtain intermediate PWM dimming data.

[0043] S103, when the target dimming data type is either DC dimming or PWM dimming, process the intermediate dimming data corresponding to the target dimming data type to obtain the target dimming data frame.

[0044] For example, the target dimming data frame includes a dimming data type flag and target dimming data following the flag. The dimming data type flag identifies the target dimming data type. The dimming data type flag is 1 bit, and the target dimming data can be 12 bits to support a maximum dimming precision of 30 bits. Figure 4 As shown, Figure 4 This is a schematic diagram of a target dimming data frame provided in an embodiment of the present disclosure.

[0045] For example, when the value of the dimming data type flag is 0, the target dimming data after the dimming data type flag represents the target PWM dimming data; when the value of the dimming data type flag is 1, the target dimming data after the dimming data type flag represents the target DC dimming data.

[0046] A specific description of one possible implementation of S103 is as follows: First, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data.

[0047] For example, when the target dimming data type is DC dimming, the intermediate DC dimming data is encoded using DC dimming data encoding to obtain the target DC dimming data; when the target dimming data type is PWM dimming, the intermediate PWM dimming data is encoded using PWM dimming data encoding to obtain the target PWM dimming data.

[0048] Then, before the most significant bit of the target dimming data, set the dimming data type flag bit and set the dimming data type flag bit to the target value to identify the target dimming data type.

[0049] For example, when the target dimming data type is DC dimming, the dimming data type flag bit before the most significant bit of the target DC dimming data is set to 1; when the target dimming data type is PWM dimming, the dimming data type flag bit before the most significant bit of the target PWM dimming data is set to 0, such as... Figure 4 As shown.

[0050] Finally, the target dimming data, which includes the dimming data type flag, is encapsulated into a target dimming data frame.

[0051] For example, based on the above embodiments, if the target dimming data with the dimming data type flag is 13 bits, then 3 bits of padding data need to be set after the target dimming data. The padding data can be 000, thus obtaining a 16-bit target dimming data frame. For instance, when the target dimming data type is DC dimming, the target DC dimming data with the dimming data type flag is encapsulated into a DC dimming data frame; when the target dimming data type is PWM dimming, the target PWM dimming data with the dimming data type flag is encapsulated into a PWM dimming data frame.

[0052] S104, the target dimming data frame is sent to the BDIC so that the BDIC dims the LED backlight based on the target dimming data frame.

[0053] For example, the BDIC receives the target dimming data frame sent by the BCON, determines the decoding method based on the value of the dimming data type flag in the target dimming data frame, and decodes the target dimming data according to the decoding method to obtain the drive signal corresponding to the target dimming data. Meanwhile, the non-target dimming data remains unchanged, so the drive signal corresponding to the non-target dimming data remains unchanged. The LED backlight is driven to emit light according to the drive signal corresponding to the target dimming data and the drive signals corresponding to the non-target dimming data, thereby achieving dimming of the LED backlight.

[0054] Compared to the 32-bit dimming data in hybrid dimming technology, the target dimming data frame in this disclosure is 16-bit, reducing the dimming bandwidth requirement by half and effectively alleviating the system bandwidth bottleneck.

[0055] In this embodiment of the disclosure, during the dimming stage, the dimming information of the current image frame sent by the system-on-a-chip is received. The initial dimming data is split based on the target dimming data type to obtain intermediate dimming data corresponding to the target dimming data type. When the target dimming data type is either DC dimming or PWM dimming, the intermediate dimming data corresponding to the target dimming data type is processed to obtain the target dimming data frame. The target dimming data frame is then sent to the backlight driver chip so that the backlight driver chip dims the LED backlight using the target dimming data frame. This allows for the single transmission of either PWM dimming data or DC dimming data in the backlight dimming system, which can improve bandwidth efficiency, reduce data redundancy, and reduce the amount of data transmitted per frame time to avoid backlight response lag.

[0056] In some embodiments, the method further includes the following steps before performing S103: S201, Obtain Protocol Command.

[0057] For example, the protocol command may include the encoding method corresponding to the target dimming data type and the encoding method corresponding to the non-target dimming data type, or only include the encoding method corresponding to the target dimming data type, which can be adjusted in real time by the SOC or BCON. The target dimming data type is one of DC dimming and PWM dimming, and the non-target dimming data type is the other dimming data type.

[0058] For example, in scenarios with limited bandwidth, such as high refresh rates and high tolerance for single-frame latency, the protocol commands only include the encoding method corresponding to the target dimming data type; in latency-sensitive scenarios, such as game modes and high-speed scenes, the protocol commands include the encoding method corresponding to the target dimming data type and the encoding method corresponding to non-target dimming data types.

[0059] S201, parse the protocol command to obtain the encoding method corresponding to the target dimming data type, and determine whether the protocol command includes the encoding method corresponding to a non-target dimming data type.

[0060] For example, in scenarios with limited bandwidth, the protocol command is determined to exclude the encoding method corresponding to non-target dimming data types; in scenarios with latency sensitivity, the protocol command is determined to include the encoding method corresponding to non-target dimming data types.

[0061] A specific description of one possible implementation of S103 is as follows: S203, when it is determined that the protocol command does not include the encoding method corresponding to the non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data.

[0062] For example, when the target dimming data type is DC dimming, the intermediate DC dimming data is encoded using DC dimming data encoding to obtain the target DC dimming data; when the target dimming data type is PWM dimming, the intermediate PWM dimming data is encoded using PWM dimming data encoding to obtain the target PWM dimming data.

[0063] S204, set the dimming data type flag bit before the highest bit of the target dimming data.

[0064] S205, set the dimming data type flag to the target value to identify the target dimming data type.

[0065] For example, when the target dimming data type is DC dimming, the dimming data type flag bit before the most significant bit of the target DC dimming data is set to 1; when the target dimming data type is PWM dimming, the dimming data type flag bit before the most significant bit of the target PWM dimming data is set to 0, such as... Figure 4 As shown.

[0066] S206, encapsulate the target dimming data with the dimming data type flag bit into a target dimming data frame.

[0067] For example, when the target dimming data type is DC dimming, 3 padding bits are set after the least significant bit of the 12-bit target DC dimming data with a 1-bit dimming data type flag, and the padding bits are set as padding data, such as 000, thereby obtaining a 16-bit bandwidth DC dimming data frame to support a maximum dimming accuracy of 30 bits.

[0068] When the target dimming data type is PWM dimming, 3 supplementary bits are set after the least significant bit of the 12-bit target PWM dimming data with a 1-bit dimming data type flag, and the supplementary bits are set as supplementary data, thereby obtaining a 16-bit bandwidth PWM dimming data frame to support a maximum dimming accuracy of 30 bits.

[0069] Based on the above embodiments, the specific steps of the backlight dimming method further include: S207, when it is determined that the protocol command includes an encoding method corresponding to a non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data.

[0070] For example, when the target dimming data type is DC dimming, the intermediate DC dimming data is encoded using DC dimming data encoding to obtain the target DC dimming data; when the target dimming data type is PWM dimming, the intermediate PWM dimming data is encoded using PWM dimming data encoding to obtain the target PWM dimming data.

[0071] S208, Encode the intermediate dimming data corresponding to the non-target dimming data type according to the encoding method corresponding to the non-target dimming data type to obtain the non-target dimming data.

[0072] For example, when the target dimming data type is DC dimming and the non-target dimming data type is PWM dimming, the intermediate PWM dimming data is encoded using the PWM dimming data encoding method to obtain the target PWM dimming data; when the target dimming data type is PWM dimming and the non-target dimming data type is DC dimming, the intermediate DC dimming data is encoded using the DC dimming data encoding method to obtain the target DC dimming data.

[0073] S209, merges and encapsulates the target dimming data and non-target dimming data into a target dimming data frame.

[0074] For example, when the target dimming data type is DC dimming, the target dimming data is 10-bit target DC dimming data, and the non-target dimming data is 16-bit target PWM dimming data. After merging the target dimming data and the non-target dimming data, a 26-bit mixed dimming data is obtained. A 6-bit null character needs to be set before the most significant bit of the mixed dimming data to align the mixed dimming data, resulting in a 32-bit bandwidth mixed dimming data frame to support a maximum dimming accuracy of 32 bits. Figure 1 As shown.

[0075] In this embodiment, when the protocol command does not include the encoding method corresponding to a non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data. A dimming data type flag is set before the most significant bit of the target dimming data, and the dimming data type flag is set to the target value to identify the target dimming data type. The target dimming data with the dimming data type flag is encapsulated into a target dimming data frame. When the protocol command includes the encoding method corresponding to a non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data. The intermediate dimming data corresponding to the non-target dimming data type is encoded according to the encoding method corresponding to the non-target dimming data type to obtain the non-target dimming data. The target dimming data and the non-target dimming data are merged and encapsulated into a target dimming data frame. This allows switching between DC dimming / PWM dimming and hybrid dimming to adapt to different scenario requirements and improve the dimming effect. In addition, it does not require changing the existing physical layer communication architecture, making the implementation simple. In some implementations, a specific description of one possible way of executing S206 is as follows: Add a supplementary bit after the least significant bit of the target dimming data, and set the supplementary bit as dithering data to obtain the target dimming data frame.

[0076] For example, if the target dimming data with dimming data type flag is 13 bits, then 3 padding bits need to be set after the least significant bit of the target dimming data, and the padding bits are set to dither data to improve dimming accuracy, thereby obtaining a target dimming data frame with a bandwidth of 16 bits to support a maximum dimming accuracy of 30 bits.

[0077] Compared to the 26-bit effective dimming data in hybrid dimming technology, the target dimming data frame in this disclosure includes 12-bit target DC dimming data, 12-bit target PWM dimming data, 3-bit jitter data of target DC dimming data, and 3-bit jitter data of target PWM dimming data, which reduces bandwidth without affecting dimming resolution.

[0078] In this embodiment of the disclosure, by setting a supplementary bit after the least significant bit of the target dimming data and setting the supplementary bit as dithering data, the target dimming data frame is obtained, which can improve the dimming accuracy.

[0079] In some implementations, before executing S104, the following steps are also included: S301, when the target dimming data type includes DC dimming and PWM dimming, the intermediate DC dimming data is encoded according to the DC dimming data encoding method to obtain the target DC dimming data.

[0080] S302: Encode the intermediate PWM dimming data according to the PWM dimming data encoding method to obtain the target PWM dimming data.

[0081] S303 merges and encapsulates the target DC dimming data and the target PWM dimming data into a target dimming data frame.

[0082] For example, after merging the 16-bit target PWM dimming data into the least significant bit of the 10-bit target DC dimming data, a 6-bit null character is set before the most significant bit of the 10-bit target DC dimming data to align the mixed dimming data, resulting in a 32-bit bandwidth mixed dimming data frame. The least significant bit of the 6-bit null character is multiplexed as a dimming data type flag to avoid additional bandwidth overhead.

[0083] In this embodiment of the disclosure, by multiplexing the least significant bit in the null character bit of the hybrid dimming data frame as the dimming data type flag bit in the DC dimming data frame and the PWM dimming data frame, additional bandwidth overhead can be avoided.

[0084] In some embodiments, the backlight dimming method further includes the following steps: During the initialization phase, the initial values ​​of DC dimming data and PWM dimming data are broadcast to the BDIC so that the BDIC can set the initial brightness of the LED backlight based on the initial values ​​of DC dimming data and PWM dimming data.

[0085] For example, the backlight protocol supports BCON to send the initial values ​​of DC dimming data and PWM dimming data to the BDIC of all channels (Lane) via broadcast, and all subsequent dimming is based on these two initial values.

[0086] When the system is powered on or the scene is switched, the BCON broadcasts the initial values ​​of the DC dimming data and the PWM dimming data to all BDICs. The BDICs determine the initial drive signal based on the initial values ​​of the DC dimming data and the PWM dimming data, and drive the LED backlight to emit light according to the initial drive signal so that the LED backlight reaches the initial brightness.

[0087] This disclosure also provides a backlight dimming device. Figure 5 This is a schematic diagram of the structure of a backlight dimming device provided in an embodiment of the present disclosure, as shown below. Figure 5 As shown, the backlight dimming device includes: The receiving module 110 is used to receive the dimming information of the current image frame sent by the system-on-a-chip during the dimming stage. The dimming information includes the target dimming data type and the initial dimming data.

[0088] The splitting module 120 is used to split the initial dimming data based on the target dimming data type to obtain the intermediate dimming data corresponding to the target dimming data type.

[0089] The processing module 130 is used to process the intermediate dimming data corresponding to the target dimming data type when the target dimming data type is either DC dimming or PWM dimming, to obtain a target dimming data frame; wherein, the target dimming data frame includes a dimming data type flag bit, which is used to identify the target dimming data type.

[0090] The transmitting module 140 is used to send the target dimming data frame to the backlight driver chip so that the backlight driver chip dims the LED backlight based on the target dimming data frame.

[0091] In some embodiments, the backlight dimming device further includes: The acquisition module is used to acquire protocol commands, which include the encoding method corresponding to the target dimming data type.

[0092] The parsing module is used to parse the protocol commands, obtain the encoding method corresponding to the target dimming data type, and determine whether the protocol commands include the encoding method corresponding to non-target dimming data types.

[0093] In some embodiments, the processing module 130 is further configured to, when determining that the protocol command does not include the encoding method corresponding to the non-target dimming data type, encode the intermediate dimming data corresponding to the target dimming data type according to the encoding method corresponding to the target dimming data type to obtain the target dimming data; set a dimming data type flag bit before the most significant bit of the target dimming data; set the dimming data type flag bit to a target value to identify the target dimming data type; and encapsulate the target dimming data with the dimming data type flag bit into a target dimming data frame.

[0094] In some embodiments, the processing module 130 is further configured to set a supplementary bit after the least significant bit of the target dimming data; and set the supplementary bit as dithering data / supplementary data to obtain the target dimming data frame.

[0095] In some embodiments, the processing module 130 is further configured to, when determining that the protocol command includes an encoding method corresponding to a non-target dimming data type, encode the intermediate dimming data corresponding to the target dimming data type according to the encoding method corresponding to the target dimming data type to obtain target dimming data; encode the intermediate dimming data corresponding to the non-target dimming data type according to the encoding method corresponding to the non-target dimming data type to obtain non-target dimming data; and merge and encapsulate the target dimming data and non-target dimming data into a target dimming data frame.

[0096] In some embodiments, the processing module 130 is further configured to, when the target dimming data type includes DC dimming and PWM dimming, encode the intermediate DC dimming data according to the DC dimming data encoding method to obtain the target DC dimming data; encode the intermediate PWM dimming data according to the PWM dimming data encoding method to obtain the target PWM dimming data; and merge and encapsulate the target DC dimming data and the target PWM dimming data into a target dimming data frame, wherein the target dimming data frame includes a null character bit, and the least significant bit in the null character bit is multiplexed as a dimming data type flag bit.

[0097] In some embodiments, the backlight dimming device further includes: The broadcast module is used to broadcast the initial values ​​of DC dimming data and PWM dimming data to the backlight driver chip during the initialization phase, so that the backlight driver chip can set the initial brightness of the LED backlight based on the initial values ​​of DC dimming data and PWM dimming data.

[0098] The apparatus provided in this disclosure is used to perform the steps provided in any of the above method embodiments, has the functional modules corresponding to the method embodiments, and has the beneficial effects of the method embodiments, which will not be repeated here.

[0099] This disclosure also provides a backlight module, including an LED backlight source and a backlight dimming system provided in the above embodiments. The BCON in the backlight dimming system is used to perform the steps provided in any of the above method embodiments. The backlight module has the functional modules corresponding to the method embodiments and has the beneficial effects of the method embodiments, which will not be elaborated here.

[0100] This disclosure also provides a display device, including a display panel and a backlight module provided in the above embodiments, which has the same functional modules and beneficial effects as the backlight module, and will not be described in detail here.

[0101] Unless otherwise expressly indicated by the context, the singular form of words used herein and in the appended claims includes the plural form, and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the terms “comprising” and “including” are to be interpreted as including rather than exclusively. Likewise, the terms “including” and “or” should be interpreted as including unless such interpretation is expressly prohibited herein. Where the term “example” is used herein, the “example” is merely exemplary and illustrative, and should not be considered exclusive or extensive.

[0102] Several embodiments of this disclosure have been described in detail above. However, it is obvious that those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of this disclosure. The scope of protection of this disclosure is defined by the appended claims.

Claims

1. A backlight dimming method, characterized in that, include: During the dimming stage, dimming information of the current image frame sent by the system-on-a-chip is received, and the dimming information includes the target dimming data type and the initial dimming data; Based on the target dimming data type, the initial dimming data is split to obtain intermediate dimming data corresponding to the target dimming data type; When the target dimming data type is either DC dimming or PWM dimming, the intermediate dimming data corresponding to the target dimming data type is processed to obtain the target dimming data frame; wherein, the target dimming data frame includes a dimming data type flag bit, which is used to identify the target dimming data type; The target dimming data frame is sent to the backlight driver chip so that the backlight driver chip dims the LED backlight based on the target dimming data frame.

2. The method according to claim 1, characterized in that, Before processing the intermediate dimming data corresponding to the target dimming data type, the method further includes: Obtain the protocol command, which includes the encoding method corresponding to the target dimming data type; The protocol command is parsed to obtain the encoding method corresponding to the target dimming data type, and it is determined whether the protocol command includes the encoding method corresponding to a non-target dimming data type.

3. The method according to claim 2, characterized in that, The processing of the intermediate dimming data corresponding to the target dimming data type includes: When it is determined that the protocol command does not include the encoding method corresponding to the non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data. Set the dimming data type flag bit before the most significant bit of the target dimming data; Set the dimming data type flag to a target value to identify the target dimming data type; The target dimming data, which includes the dimming data type flag, is encapsulated into the target dimming data frame.

4. The method according to claim 3, characterized in that, The step of encapsulating the target dimming data, which includes a dimming data type flag, into a target dimming data frame includes: Add a supplementary bit after the least significant bit of the target dimming data; The supplementary bit is set to dither data / supplementary bit data to obtain the target dimming data frame.

5. The method according to claim 3, characterized in that, Before sending the target dimming data frame to the backlight driver chip, the method further includes: When it is determined that the protocol command includes the encoding method corresponding to the non-target dimming data type, the intermediate dimming data corresponding to the target dimming data type is encoded according to the encoding method corresponding to the target dimming data type to obtain the target dimming data; The intermediate dimming data corresponding to the non-target dimming data type is encoded according to the encoding method corresponding to the non-target dimming data type to obtain the non-target dimming data; The target dimming data and the non-target dimming data are merged and encapsulated into the target dimming data frame.

6. The method according to any one of claims 1-5, characterized in that, Before sending the target dimming data frame to the backlight driver chip, the method further includes: When the target dimming data type includes DC dimming and PWM dimming, the intermediate DC dimming data is encoded according to the DC dimming data encoding method to obtain the target DC dimming data; The intermediate PWM dimming data is encoded according to the PWM dimming data encoding method to obtain the target PWM dimming data; The target DC dimming data and the target PWM dimming data are merged and encapsulated into a target dimming data frame. The target dimming data frame includes a null character bit, and the least significant bit of the null character bit is multiplexed as the dimming data type flag bit.

7. The method according to any one of claims 1-5, characterized in that, The method further includes: During the initialization phase, the initial values ​​of DC dimming data and PWM dimming data are broadcast to the backlight driver chip so that the backlight driver chip sets the initial brightness of the LED backlight based on the initial values ​​of the DC dimming data and the initial values ​​of the PWM dimming data.

8. A backlight dimming device, characterized in that, include: The receiving module is used to receive the dimming information of the current image frame sent by the system-on-a-chip during the dimming stage. The dimming information includes the target dimming data type and the initial dimming data. The splitting module is used to split the initial dimming data based on the target dimming data type to obtain intermediate dimming data corresponding to the target dimming data type. The processing module is used to process the intermediate dimming data corresponding to the target dimming data type when the target dimming data type is either DC dimming or PWM dimming, to obtain a target dimming data frame; wherein, the target dimming data frame includes a dimming data type flag bit, which is used to identify the target dimming data type; The sending module is used to send the target dimming data frame to the backlight driver chip, so that the backlight driver chip dims the LED backlight based on the target dimming data frame.

9. A backlight dimming system, characterized in that, This includes system-on-a-chip (SoC), backlight controller, and backlight driver chip. The system-on-a-chip is used to analyze the dimming requirements of the current frame and obtain the dimming information of the current frame. The backlight controller is used to perform the method according to any one of claims 1-7.

10. A backlight module, characterized in that, It includes an LED backlight and the backlight dimming system as described in claim 9.

11. A display device, characterized in that, It includes a display panel and the backlight module as described in claim 10.

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