Display delay determination method and system and backlight control method

Abstract

The embodiment of the invention provides a display delay determination method and system and a backlight control method, and the method comprises the steps: obtaining a first receiving time length and a second receiving time length of a target backlight partition in a backlight module, the first receiving time length being used for indicating the time length when the target backlight partition receives single-frame display data sent by a backlight control chip, and the second receiving time length being used for indicating the time length when the target backlight partition receives the single-frame display data sent by the backlight control chip; the second receiving duration is used for indicating the duration when the display screen corresponding to the target backlight partition receives the single-frame display data sent by the display screen control chip; and according to the first receiving duration and the second receiving duration, determining the display delay of the target backlight partition relative to the corresponding display screen. According to the embodiment of the invention, the receiving duration of the single-frame display data by each backlight partition is detected, the receiving duration of the single-frame display data received by the corresponding display screen is compared, and the display delay of each backlight partition relative to the display screen is determined, so that the effect of synchronizing the brightness of the backlight and the brightness of the display screen is achieved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display delay determination method, system and backlight control method. Background Art

[0002] Mini-LED is a new type of display technology that uses tiny LED lamp beads as backlight sources. A large number of tiny LED lamp beads are combined together to form a backlight source. In Mini LED display technology, in order to achieve local dimming effects, multiple backlight driver chips (backlight ICs) are controlled by a backlight control chip to drive the backlight LED lamp beads. In actual display, the display data is given to the backlight control chip and the display control chip respectively, and the backlight control chip and the display control chip work together to display a frame of data.

[0003] In Mini LED display, in order to ensure the display effect, the backlight LED lamp beads need to be turned on synchronously with the display of the display, and usually the display is turned on first, and then the backlight is turned on. However, since the backlight control chip and the display control chip have their own processing time for display data, the method of simply achieving synchronization through the Vsync (Vertical Synchronization) signal is not accurate. Summary of the invention

[0004] The embodiments of the present application provide a display delay determination method, system and backlight control method for solving the problem of backlight asynchrony.

[0005] In a first aspect, an embodiment of the present application provides a method for determining a display delay, the method comprising:

[0006] Obtain a first receiving duration and a second receiving duration of a target backlight partition in a backlight module, wherein the first receiving duration is used to indicate the duration for which the target backlight partition receives a single frame of display data sent by a backlight control chip, and the second receiving duration is used to indicate the duration for which a display screen corresponding to the target backlight partition receives a single frame of display data sent by a display screen control chip;

[0007] A display delay of the target backlight partition relative to the corresponding display screen is determined according to the first receiving time length and the second receiving time length.

[0008] In a possible implementation manner, obtaining a first receiving duration and a second receiving duration of a target backlight partition in a backlight module includes:

[0009] Acquire a first receiving duration and a second receiving duration of a reference backlight partition in the backlight module, where the reference backlight partition refers to a backlight partition in the same row or column as the target backlight partition;

[0010] According to the relative position relationship between the target backlight partition and the reference backlight partition, a first receiving time length and a second receiving time length of the target backlight partition are determined.

[0011] In a possible implementation manner, obtaining a first receiving duration of a reference backlight partition includes:

[0012] Acquire a third receiving duration of a backlight driver chip driving a reference backlight partition, where the third receiving duration is used to indicate the duration of time during which the backlight driver chip receives a single frame of display data sent by the backlight control chip;

[0013] The first receiving duration of the reference backlight partition is determined according to the relative position of the reference backlight partition in all backlight partitions driven by the backlight driving chip and the third receiving duration of the backlight driving chip.

[0014] In a possible implementation manner, obtaining the second receiving duration of the reference backlight partition includes:

[0015] Obtain the acquisition time when the display screen control chip receives a single frame of display data;

[0016] Obtain the brightness change moment of the display screen corresponding to the reference backlight partition;

[0017] According to the acquisition time and the brightness change time, a second receiving time length of the reference backlight partition is determined.

[0018] In a possible implementation, obtaining the brightness change moment of the display screen corresponding to the reference backlight partition includes:

[0019] The brightness change moment is determined according to the brightness data of the display screen corresponding to the reference backlight partition. The brightness data includes a voltage value obtained by detecting the brightness of the display screen by a photoelectric probe, and the voltage value is related to the brightness.

[0020] In one possible implementation, the brightness change moment includes a first jump moment or a second jump moment of the voltage value, the first jump moment is used to indicate that the voltage value jumps from a first voltage to a second voltage, and the second jump moment is used to indicate that the voltage value jumps from the second voltage to the first voltage, and the first voltage is less than the second voltage.

[0021] In a possible implementation manner, the number of reference backlight subareas is not less than 2.

[0022] In a second aspect, an embodiment of the present application provides a backlight control method, the method comprising:

[0023] Obtaining a first receiving duration of a target backlight partition in a backlight module and a second receiving duration of a display screen corresponding to the target backlight partition, wherein the first receiving duration is used to indicate that the target backlight partition receives a single frame of display data sent by a backlight control chip, and the second receiving duration is used to indicate that the display screen receives a single frame of display data sent by a display screen control chip;

[0024] Determining a display delay of a target backlight partition relative to a corresponding display screen according to the first receiving time length and the second receiving time length;

[0025] According to the display delay of the target backlight partition, the target backlight partition is controlled to display a single frame of display data.

[0026] In a third aspect, an embodiment of the present application provides a display delay determination system, the system comprising a photoelectric probe and a delay processor, the photoelectric probe is used to detect brightness data of a display screen and determine a corresponding voltage value;

[0027] The delay processor is connected to the photoelectric probe, and is used to obtain the voltage value output by the photoelectric probe, and determine the display delay of the target backlight partition according to the voltage value, and is specifically used to execute the method steps in any of the above embodiments.

[0028] In a fourth aspect, an embodiment of the present application provides an electronic device, including: a memory, a processor;

[0029] Memory stores computer-executable instructions;

[0030] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the above first aspect and / or various possible implementations of the first aspect.

[0031] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the first aspect above and / or various possible implementations of the first aspect.

[0032] In a sixth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the above first aspect and / or various possible implementation methods of the first aspect.

[0033] The display delay determination method, system and backlight control method provided in the embodiments of the present application include: obtaining the first receiving duration and the second receiving duration of the target backlight partition in the backlight module, the first receiving duration is used to indicate the duration of the target backlight partition receiving the single frame display data sent by the backlight control chip, and the second receiving duration is used to indicate the duration of the display screen corresponding to the target backlight partition receiving the single frame display data sent by the display screen control chip; according to the first receiving duration and the second receiving duration, determining the display delay of the target backlight partition relative to the corresponding display screen. The embodiments of the present application detect the receiving duration of the single frame display data of each backlight partition, compare it with the receiving duration of the single frame data received by the corresponding display screen, and determine the display delay of each backlight partition relative to the display screen, thereby achieving the effect of synchronizing the brightness of the backlight and the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0035] Figure 1 is a schematic diagram of the structure of a Mini-LED provided in an embodiment;

[0036] Figure 2 A schematic diagram of an application scenario of a method for determining a display delay provided in an embodiment;

[0037] Figure 3 A flow chart of a method for determining a display delay provided in an embodiment Figure 1 ;

[0038] Figure 4 A schematic diagram of a display process of a Mini-LED provided in an embodiment;

[0039] Figure 5 A flow chart of a method for determining a display delay provided in an embodiment Figure 2 ;

[0040] Figure 6 A waveform diagram of a Vsync signal provided in one embodiment;

[0041] Figure 7 A schematic diagram of a channel structure of a backlight driver chip provided in an embodiment;

[0042] Figure 8 A flow chart of a method for determining a display delay provided in an embodiment Figure 3 ;

[0043] Fig. 9 A schematic flow chart of a backlight control method provided in an embodiment;

[0044] Fig.10 A schematic diagram of the structure of a backlight module provided in one embodiment;

[0045] Fig.11 A waveform diagram of a received signal of a backlight driving chip provided in one embodiment;

[0046] Fig.12 An output waveform diagram of a photoelectric probe provided in one embodiment;

[0047] Fig.13 A display delay diagram provided in an embodiment Figure 1 ;

[0048] Fig.14 A display delay diagram provided in an embodiment Figure 2 ;

[0049] Fig.15 A schematic diagram of the structure of a display delay determination device provided in one embodiment;

[0050] Fig.16 A schematic diagram of the structure of an electronic device provided in an embodiment.

[0051] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0052] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0053] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] First, the terms involved in this application are explained:

[0055] Mini-LED: Sub-millimeter light-emitting diode, Mini-LED display includes Mini-LED direct display and Mini-LED backlight. Mini-LED backlight control requires the combination of backlight control chip and backlight driver chip (Dimmer). Normally, each screen requires at least one backlight driver chip, which acts like a "master control switch" to control the backlight source. Dimmer can be divided into single-channel, 4-channel, 8-channel, 16-channel and other types. One channel corresponds to a backlight partition, and one backlight partition can cover multiple LED lamp beads.

[0056] TCON board: Timing control circuit, also known as logic board, screen driver board, central control board, is a circuit board used to drive liquid crystal display screens. It is used to convert the image data input signal sent by the digital board (the input signal includes three types of signals: RGB data signal, clock signal, and control signal) into a signal that can be recognized by the LCD screen, thereby controlling the distortion of the liquid crystal molecules and driving the LCD screen to display images. The TCON board includes a display control chip.

[0057] Vsync: The full name is Vertical Synchronization, which is a technology to prevent screen tearing. In Mini-LED display, such as Figure 1 As shown, after the system chip 101 processes the image to obtain display data, it will synchronously send the display data to the display screen control chip 102 and the backlight control chip 103 on the TCON board, and the display screen control chip 102 and the backlight control chip 103 will process the display data and then display it. Among them, a Vsync signal will be added to the display data to achieve synchronization between the display screen and the backlight.

[0058] In actual display, the display data is given to the backlight control chip and the display control chip respectively, and the backlight control chip and the display control chip work together to realize the display of one frame of data. In order to ensure the display effect, the backlight LED lamp needs to be turned on synchronously with the display of the display, and usually the display is turned on first, and then the backlight is turned on. However, since the backlight control chip and the display control chip have their own processing time for display data, the method of simply achieving synchronization through the Vsync (Vertical Synchronization) signal is not accurate.

[0059] In order to solve the above technical problems, the embodiments of the present application provide a method for determining a display delay. The method for determining a display delay provided by the embodiments of the present application can be applied to the real-time control of the Mini-LED backlight, and the display delay of each backlight partition is determined during the real-time display process of the Mini-LED, so that the backlight and display screen of the Mini-LED are synchronized; or the display screen can be produced after the display screen is manufactured but before it leaves the factory, by using the method provided by the embodiments of the present application to determine the display delay of each backlight partition, and then input the display delay into the backlight driver chip, and call the display delay of each backlight partition during actual display to control each backlight partition.

[0060] The display delay determination method provided in the embodiment of the present application can be applied to the following examples: Figure 2 In the application environment shown, the terminal 202 is used to obtain the first receiving duration and the second receiving duration of the backlight partition. The terminal 202 communicates with the server 204 through the network, and sends the first receiving duration and the second receiving duration to the server 204, which processes and analyzes the data, determines the display delay of each backlight partition, and the backlight control chip implements synchronization control according to the display delay of each backlight partition. The data storage system can store the data that the server 204 needs to process. The data storage system can be integrated on the server 204, or it can be placed on the cloud or other network servers.

[0061] The terminal 202 may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, IoT devices, and portable wearable devices. The IoT devices may be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The server 204 may be implemented as an independent server or a server cluster consisting of multiple servers.

[0062] In one embodiment, Figure 3 As shown, a method for determining a display delay is provided, and the method is applied to Figure 2 Taking the server 204 in the example as an example, the method includes the following steps:

[0063] Step 302, obtaining a first receiving duration and a second receiving duration of a target backlight partition in the backlight module, wherein the first receiving duration is used to indicate the duration for the target backlight partition to receive a single frame of display data sent by the backlight control chip, and the second receiving duration is used to indicate the duration for a display screen corresponding to the target backlight partition to receive a single frame of display data sent by the display screen control chip;

[0064] Step 304: Determine a display delay of the target backlight partition relative to the corresponding display screen according to the first receiving time length and the second receiving time length.

[0065] Among them, the target backlight partition is any backlight partition among all the backlight partitions of the backlight module. All the backlight partitions of the backlight module include all the channels of all the backlight driver chips of the backlight module. The number of target backlight partitions of the backlight module can be one or more. In actual application scenarios, in order to achieve better display effects, it is necessary to determine the display delay of each backlight partition in the backlight module. Therefore, the target backlight partition is each backlight partition.

[0066] However, in the actual display process, the order of the display screen is from top to bottom, that is, the display mode is line by line. Figure 4 As shown, the data of the display screen is displayed from top to bottom in one frame. In order to keep the backlight of the backlight module consistent with the data of the display screen, the backlight LED brightness is synchronized with the display screen as much as possible, so as to achieve more synchronized display data. Figure 3 , within a frame, the liquid crystal on the display screen corresponding to backlight line 1 is turned on first, and then the backlight corresponding to line 1 is turned on; the liquid crystal on the display screen corresponding to line 2 is turned on first, and then the backlight corresponding to line 2 is turned on, and so on, until it is all lit up to line N, completing the display of a frame of data. Therefore, the backlight partitions of the same row are usually lit at the same time. Therefore, based on the method provided in this embodiment, it is only necessary to determine the display delay of one backlight partition in the backlight partitions of the same row, and then use the display delay as the display delay of all backlight partitions in the same row. Similarly, if the display screen adopts column-by-column display, then for the backlight partitions of the same column, it is only necessary to determine the display delay of one backlight partition.

[0067] The first receiving duration of the target backlight partition refers to the duration that the backlight control chip sends the single frame display data to the target backlight partition after identifying the single frame display data. The first backlight partition includes the processing duration of the single frame display data by the backlight control chip and the transmission duration of the single frame display data between the backlight control chip and the target backlight partition. The first receiving duration can be determined by directly detecting the data input of the backlight driver chip of the target backlight partition, and the duration of transmitting the single frame display data from the backlight control chip to the backlight driver chip is used as the first receiving duration.

[0068] The display screen corresponding to the target backlight partition refers to a display screen corresponding to the target backlight partition on the entire display screen. The second receiving duration of the target backlight partition refers to the duration that the display screen control chip sends the single-frame display data to the display screen corresponding to the target backlight partition after identifying the single-frame display data. The second receiving duration includes the processing duration of the single-frame display data by the display screen control chip, the transmission duration of the single-frame display data between the display screen control chip and the display screen corresponding to the target backlight partition, and the LCD startup duration of the display screen corresponding to the target backlight partition.

[0069] The second receiving duration is determined by detecting the liquid crystal state of the display screen, and the time from when the single-frame display data display screen control chip receives the single-frame display data to when the liquid crystal of the corresponding display screen is fully turned on is used as the second receiving duration. Among them, the most direct way to detect the liquid crystal state of the display screen is to determine it by observing the display state of the display screen, such as the brightness and color of the display screen.

[0070] When the default display control chip and the backlight control chip receive single-frame display data at the same time, the difference between the first receiving duration and the second receiving duration of the target backlight partition can reflect the time difference of turning on the backlight and the display for the single-frame display data.

[0071] The display delay of the target backlight partition relative to the corresponding display screen refers to the length of time that the target backlight partition displays later than the corresponding display screen after receiving a single frame of display data. The target backlight partition is driven by the backlight driver chip, so the display delay of the target backlight partition is also the drive output delay of the backlight driver chip. The display delay is performed by the backlight driver chip to achieve the effect of synchronizing the backlight and the display screen.

[0072] The determination of the display delay of the target backlight partition can be a step performed when each frame of display data is displayed, and the display delay of the target backlight partition for each frame of display data is determined. It can also be based on one or more frames of display data as experimental data. After determining the display delay of the target backlight partition, when displaying each frame of display data thereafter, the target backlight partition provides backlight based on the display delay. The first scheme mentioned above requires extremely fast data acquisition and processing efficiency, otherwise the target backlight partition will not be able to provide accurate backlight when each frame of display data is displayed, while the second scheme mentioned above is suitable for Mini-LED display within a period of time. With the use of Mini-LED, the backlight control chip and the display screen control chip have certain losses. Therefore, at this time, there is an error in the display delay of the target backlight partition. Therefore, the first scheme can be combined with the second scheme to determine the display delay of the target backlight partition based on a preset period or preset frame display data.

[0073] In the method provided in the above embodiment, the first receiving duration and the second receiving duration of the target backlight partition in the backlight module are obtained, the first receiving duration is used to indicate the duration for the target backlight partition to receive the single frame display data sent by the backlight control chip, and the second receiving duration is used to indicate the duration for the display screen corresponding to the target backlight partition to receive the single frame display data sent by the display screen control chip; according to the first receiving duration and the second receiving duration, the display delay of the target backlight partition relative to the corresponding display screen is determined. The embodiment of the present application detects the receiving duration of the single frame display data of each backlight partition, compares it with the receiving duration of the single frame data received by the corresponding display screen, and determines the display delay of each backlight partition relative to the display screen, thereby achieving the effect of synchronizing the brightness of the backlight and the display screen.

[0074] In one embodiment, if Figure 5 As shown, obtaining a first receiving duration and a second receiving duration of a target backlight partition in a backlight module includes:

[0075] Step 502, obtaining a first receiving duration and a second receiving duration of a reference backlight partition in the backlight module, where the reference backlight partition refers to a backlight partition in the same row or column as the target backlight partition;

[0076] Step 504 : determining a first receiving time length and a second receiving time length of the target backlight partition according to the relative position relationship between the target backlight partition and the reference backlight partition.

[0077] The reference backlight partition refers to the backlight partition in the same row or column as the target backlight partition. Since each backlight partition in the backlight module can be used as a target backlight partition, but it is relatively complicated to calculate and determine the display delay of all backlight partitions, therefore, in combination with the structural characteristics of Mini-LED, several backlight partitions are selected from all backlight partitions of the backlight module as reference backlight partitions to detect the first receiving duration and the second receiving duration, and then the first receiving duration and the second receiving duration of the target backlight partition are determined based on the first receiving duration and the second receiving duration of the reference backlight partition, combined with the relationship between the target backlight partition and the reference backlight partition in the row or column.

[0078] In the backlight module, according to the display mode of the corresponding display screen of the backlight module, such as row-by-row scanning, several backlight partitions in different rows are selected in the column direction as reference backlight partitions. Among them, the reference backlight partition of each row may include one or more backlight partitions, and the positions of the multiple backlight partitions included may be adjacent or non-adjacent. According to the data of multiple backlights in the same row, the data of the reference backlight partition of this row is determined. Similarly, if the display screen is scanned column by column, several backlight partitions in different columns are selected in the row direction as reference backlight partitions.

[0079] It should be noted that in actual application scenarios, it is necessary to determine the corresponding display delays of all backlight partitions in the backlight module, that is, all backlight partitions are target backlight partitions. At this time, the reference backlight partition also needs to determine the display delay. Therefore, when the reference backlight partition is also the target backlight partition, the corresponding display delay of the reference backlight partition is determined according to the first receiving duration and the second receiving duration of the reference backlight partition. After the corresponding display delay of the reference backlight partition, the corresponding display delays of other target backlight partitions other than the reference backlight partition are determined according to the reference backlight partition. The first receiving duration and the second receiving duration of the target backlight partition can be determined according to the first receiving duration and the second receiving duration of the target backlight partition, and then the display delay of the target backlight partition can be determined according to the first receiving duration and the second receiving duration of the target backlight partition. It is also possible to first determine the corresponding display delay of the reference backlight partition according to the first receiving duration and the second receiving duration of the reference backlight partition, and then determine the corresponding display delay of the target backlight partition according to the display delay of the reference backlight partition.

[0080] The relative position relationship between the target backlight partition and the reference backlight partition refers to the relative position in the row and / or column direction. Usually, there is only one between the row and the column. Exemplarily, if the display screen is displayed row by row, only the relative position of the target backlight partition and the reference backlight partition in the column direction is considered. If the display screen is displayed column by column, only the relative position of the target backlight partition and the reference backlight partition in the row direction is considered.

[0081] The number of reference backlight partitions is at least one. Since the transmission speed of a single frame display data in the screen is basically the same, the first reception duration and the second reception duration of all rows or all columns can be determined based on the first reception duration and the second reception duration of a reference backlight partition. Since the liquid crystals in the backlight module and the display screen are evenly spaced in rows and columns, the first reception duration and the second reception duration are also evenly spaced. Therefore, in actual application scenarios, it is only necessary to know the first reception duration and the second reception duration of two reference backlight partitions in different rows or columns to obtain the first reception duration and the second reception duration of all rows or all columns. Therefore, in one embodiment, the number of reference backlight partitions is not less than 2, and the reference backlight partitions are different rows or different columns.

[0082] In the method provided in the above embodiment, the first receiving duration and the second receiving duration of the reference backlight partition are detected, and the target backlight partition is determined by the reference backlight partition. There is no need to detect all backlight partitions. The first receiving duration and the second receiving duration of any target backlight partition can be determined based on the relative position relationship between the target backlight partition and the reference backlight partition.

[0083] In one embodiment, obtaining a first receiving duration of a reference backlight partition includes:

[0084] Acquire a third receiving duration of a backlight driver chip driving a reference backlight partition, where the third receiving duration is used to indicate the duration of time during which the backlight driver chip receives a single frame of display data sent by the backlight control chip;

[0085] The first receiving duration of the reference backlight partition is determined according to the relative position of the reference backlight partition in all backlight partitions driven by the backlight driving chip and the third receiving duration of the backlight driving chip.

[0086] It can be known that the backlight partition is driven by the backlight driver chip, the backlight control chip transmits the single-frame display data to the backlight driver chip, and then the backlight driver chip drives the corresponding backlight partition. Therefore, the first receiving duration of the reference backlight partition includes the processing duration of the single-frame display data by the backlight control chip, the transmission duration of the single-frame display data between the backlight control chip and the backlight driver chip, and the driving duration of the reference backlight partition driven by the backlight driver chip.

[0087] The third duration of the backlight driver chip refers to the duration of the backlight driver chip receiving the single frame display data sent by the backlight control chip, including the processing duration of the single frame display data by the backlight control chip and the transmission duration of the single frame display data between the backlight control chip and the backlight driver chip. The first reception duration for the reference backlight partition can be determined based on the driving capability of the backlight driver chip for the reference backlight partition, combined with the relative position of the reference backlight partition in the channel structure of the backlight driver chip and the third reception duration.

[0088] Specifically, the third receiving duration can be the duration from when the backlight control chip receives a single frame of display data to when the backlight driving chip receives a single frame of display data. The time when the backlight control chip receives a single frame of display data is the time when the backlight control chip detects a Vsync signal in the single frame of display data. The Vsync signal is used as the frame header of each frame of display data. The backlight control chip identifies each frame of display data through the Vsync signal. Figure 6 The t shown Vsync time.

[0089] In the case of ignoring the driving duration of the reference backlight partition driven by the backlight driver chip, the first receiving duration of the reference backlight partition can be directly determined according to the third receiving duration of the backlight driver chip. Alternatively, ignoring the driving difference between different reference backlight partitions, the preset driving duration is directly added to the third receiving duration of the backlight driver chip, and the first receiving duration of all reference backlight partitions connected to the backlight driver chip can be determined.

[0090] In Mini-LED, backlight driver chips can be divided into single-channel, 4-channel, 8-channel, 16-channel and other types. One channel corresponds to one backlight partition, and one backlight partition can cover multiple LED lamp beads. If the driving time of the backlight driver chip is taken into consideration, when the backlight driver chip is a single-channel type, the third receiving time of the backlight driver chip is directly increased by a specific driving time to determine the first receiving time of the reference backlight partition. When the backlight driver chip is a multi-channel type, the relationship between the first receiving time and the third receiving time of the reference backlight partition is determined in combination with the multi-channel structure of the backlight driver chip.

[0091] For example, when the backlight driver chip is an 8-channel type, Figure 7 As shown, three channel structures of the backlight driver chip 701 are provided, and the structures of the eight backlight partitions 702 are 2×4, 4×2, and 8×1 respectively. Taking the display screen as a line-by-line display as an example, the third receiving time length of the backlight driver chip is T, and the driving time length of the backlight driver chip for each reference backlight partition is , then in the 2×4 structure, the first receiving duration of each backlight partition in the first row is , the first receiving duration of each backlight partition in the second row is , ..., and so on. The same is true for the 4×2 and 8×1 channel structures.

[0092] In the method provided in the above embodiment, the third receiving duration of the backlight driver chip can be directly obtained by detecting its input signal, and the first receiving duration of the reference backlight partition can be determined quickly and accurately through the third receiving duration of the backlight driver chip.

[0093] In one embodiment, if Figure 8 As shown, obtaining the second receiving duration of the reference backlight partition includes:

[0094] Step 802, obtaining the time when the display screen control chip receives the single frame display data;

[0095] Step 804, obtaining the brightness change moment of the display screen corresponding to the reference backlight partition;

[0096] Step 806: Determine a second receiving duration of the reference backlight partition according to the acquisition time and the brightness change time.

[0097] The acquisition moment when the display screen control chip receives the single frame display data refers to the moment when the display screen control chip recognizes the single frame display data. Like the backlight control chip, the display screen control chip recognizes each frame display data through the Vsync signal.

[0098] The moment when the brightness of the display screen changes refers to the moment when the arrangement state of the liquid crystal molecules in the display screen changes under the control of the display screen control chip. It can be known that the liquid crystal in the LCD screen refers to the "liquid crystal molecule", which is a material state between liquid and solid and has special physical properties. Liquid crystal molecules can change their arrangement structure under the action of an external electric field or light, thereby realizing the control and regulation of light. The change in the arrangement state of the liquid crystal molecules cannot be detected directly, and the change in the arrangement state of the liquid crystal molecules will affect the change in the brightness of the display screen. Therefore, the moment when the brightness of the display screen changes is considered to be the moment when the arrangement state of the liquid crystal molecules changes. Exemplarily, the moment after the brightness of the display screen changes and the brightness begins to remain unchanged is taken as the moment when the brightness of the display screen changes.

[0099] The second receiving duration is obtained by subtracting the acquisition time when the display screen control chip receives the single frame display data from the brightness change time of the display screen, which includes the processing time of the display screen control chip for the single frame display data and the response time of the liquid crystal molecules. Specifically, before the single frame display data is input, the brightness of the display screen should be different from the brightness in the single frame display data, otherwise there is no brightness change, and the brightness change time cannot be obtained.

[0100] In the method provided in the above embodiment, the change in brightness can most directly reflect the change in the arrangement state of the liquid crystal molecules, so the method of indirectly determining the second receiving time length by the change in brightness of the display screen is more accurate.

[0101] In one embodiment, obtaining the brightness change moment of the display screen corresponding to the reference backlight partition includes:

[0102] The brightness change moment is determined according to the brightness data of the display screen corresponding to the reference backlight partition. The brightness data includes a voltage value obtained by detecting the brightness of the display screen by a photoelectric probe, and the voltage value is related to the brightness.

[0103] The photoelectric probe is a photoelectric sensor that can convert light signals into electrical signals. The brightness of the display screen is detected through the photoelectric probe and a voltage signal is output. In the output voltage signal, the moment when the voltage value jumps is also the moment when the brightness of the display screen changes. Among them, the brightness change moment includes the first jump moment or the second jump moment of the voltage value. The first jump moment is used to indicate that the voltage value jumps from the first voltage to the second voltage. The first voltage is less than the second voltage, that is, the first jump moment is the moment when the brightness of the display screen changes from dark to bright; the second jump moment is used to indicate that the voltage value jumps from the second voltage to the first voltage, that is, the moment when the display screen changes from bright to dark.

[0104] In the above embodiment, the photoelectric probe is installed above the display screen corresponding to the reference backlight partition, and can directly collect the brightness of the display screen below the probe, thus solving the problem of brightness change detection.

[0105] The present application also provides a backlight control method for Figure 1 The backlight driver chip shown in the figure obtains data to determine the display delay of each backlight partition it controls, and determines its own output delay for each backlight partition according to the display delay, thereby controlling each backlight partition to emit light. Fig. 9 As shown, the method includes:

[0106] Step 902, obtaining a first receiving duration of a target backlight partition in the backlight module and a second receiving duration of a display screen corresponding to the target backlight partition, wherein the first receiving duration is used to indicate that the target backlight partition receives a single frame of display data sent by the backlight control chip, and the second receiving duration is used to indicate that the display screen receives a single frame of display data sent by the display screen control chip;

[0107] Step 904, determining a display delay of the target backlight partition relative to the corresponding display screen according to the first receiving time length and the second receiving time length;

[0108] Step 906 , controlling the target backlight partition to display a single frame of display data according to the display delay of the target backlight partition.

[0109] The backlight module has multiple backlight driver chips, each of which is a 4-channel type. Fig.10 As shown, the channel structure is 2×2. Take all backlight partitions as the target backlight partitions as an example to illustrate the above method. The display screen adopts a line-by-line display mode, and a photoelectric probe is set above the display screen corresponding to each line of backlight partitions to collect the brightness data of each line of backlight partitions. Among them, the position of the photoelectric probe can be selected by controlling the display screen to blacken the screen, and then the backlight control chip only lights up the backlight LED lights of the points that need to be confirmed. After passing through the display screen, it is confirmed that the brightness center point is the position of the photoelectric probe.

[0110] exist Fig.10 In the example, since the display screen adopts a row-by-row display mode, when all backlight partitions are target backlight partitions, one of all target backlight partitions in each row can be selected as a reference backlight partition for data detection. Fig.10 The rightmost backlight partition of each row in the display screen is taken as the reference backlight partition for detection.

[0111] The backlight panel is evenly distributed vertically, and the display data is transmitted at basically the same speed within the screen. Therefore, each row of backlight partitions can be tested, or several reference backlight partitions can be randomly selected from all rows of backlight partitions as test points. The data of all other target backlight partitions can then be deduced through the data of the reference backlight partitions.

[0112] For the first receiving duration of the reference backlight partition, since the backlight board is a PCB product, the data input time point of each row of the backlight driver chip can be directly measured to determine the first receiving duration of the reference backlight partition. Fig.11 As shown, the time for data to be transmitted to the backlight driver chip relative to Vsync is measured, as shown in the figure as T0, T1, T2, ...

[0113] For the second receiving time of the reference backlight partition, after installing the photoelectric sensor test head on the selected reference backlight partition, the display backlight is in the bright state, and the display screen is in the black screen state. At this time, the LCD is in the off state; at this time, use the oscilloscope probe to connect the voltage output of the photoelectric probe and the display synchronization signal Vsync, and cut the display screen from black to white, and you will get the following Fig.12 The waveform shown, the second receiving time length t0, t1, t2, ... is determined according to the data in the waveform.

[0114] After combining the first receiving duration and the second receiving duration of the reference backlight partition, the display delay of each reference backlight partition can be obtained, that is, the output delay of the corresponding backlight driver chip. Fig.13 As shown, the display delay of the first reference backlight partition is t0-T0, the display delay of the second reference backlight partition is t0-T0+t1, .... When the display delay of the backlight partitions of each row is the same, the time required for the backlight driver chip of each row of backlight partitions to delay display can be obtained, the first row is t0-T0, the second row is t0-T0+t1, the third row is t0+t1+t2-T2, the fourth row is t0+t1+t2+t3-T2, ....

[0115] During the acquisition of the second receiving duration, the display backlight may be set to full brightness, such as Fig.14 As shown, the display screen is in a full white state, and the liquid crystal is in an on state. At this time, an oscilloscope probe is used to connect the voltage output of the photoelectric probe and the display synchronization signal Vsync to switch the display screen from white to black. According to the obtained waveform, the second receiving time t0, t1, t2, ... is obtained to determine the display delay of each row of the backlight partition.

[0116] The method provided in the above embodiment can more accurately ensure the synchronization between display and backlight.

[0117] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0118] On the other hand, an embodiment of the present application further provides a backlight control method, the method comprising:

[0119] Obtaining a first receiving duration of a target backlight partition in a backlight module and a second receiving duration of a display screen corresponding to the target backlight partition, wherein the first receiving duration is used to indicate that the target backlight partition receives a single frame of display data sent by a backlight control chip, and the second receiving duration is used to indicate that the display screen receives a single frame of display data sent by a display screen control chip;

[0120] Determining a display delay of a target backlight partition relative to a corresponding display screen according to the first receiving time length and the second receiving time length;

[0121] According to the display delay of the target backlight partition, the target backlight partition is controlled to display a single frame of display data.

[0122] The process of determining the display delay in the above backlight control method is consistent with the steps in the above display delay determination method, which will not be described in detail. After determining the display delay, the target backlight partition is controlled to display each frame of display data based on the display delay.

[0123] Similarly, the embodiment of the present application also provides a display delay determination system, the system includes a photoelectric probe and a delay processor, the photoelectric probe is used to detect the brightness data of the display screen and determine the corresponding voltage value;

[0124] The delay processor is connected to the photoelectric probe, and is used to obtain the voltage value output by the photoelectric probe, and determine the display delay of the target backlight partition according to the voltage value, specifically for executing the method steps in any of the above embodiments.

[0125] Based on the same inventive concept, an embodiment of the present application also provides a display delay determination device. The implementation solution for solving the problem provided by the system is similar to the implementation solution recorded in the above method. Therefore, the specific limitations in one or more display delay determination device embodiments provided below can refer to the limitations on the display delay determination method above, and will not be repeated here.

[0126] In one embodiment, Fig.15 As shown, the display delay determination device includes a data acquisition module 1501 and a result determination module 1502;

[0127] The data acquisition module 1501 is used to acquire a first receiving duration and a second receiving duration of a target backlight partition in the backlight module, wherein the first receiving duration is used to indicate the duration for which the target backlight partition receives a single frame of display data sent by the backlight control chip, and the second receiving duration is used to indicate the duration for which the display screen corresponding to the target backlight partition receives a single frame of display data sent by the display screen control chip;

[0128] The result determination module 1502 is used to determine the display delay of the target backlight partition relative to the corresponding display screen according to the first receiving time length and the second receiving time length.

[0129] like Fig.16 As shown, an embodiment of the present application provides an electronic device 1600, which includes: at least one processor 1601 and a memory 1602. Optionally, the device 1600 also includes a communication component 1603. The processor 1601, the memory 1602 and the communication component 1603 are connected via a bus 1604.

[0130] In a specific implementation process, at least one processor 1601 executes the computer-executable instructions stored in the memory 1602, so that at least one processor 1601 executes the above method.

[0131] The specific implementation process of the processor 1601 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0132] In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the invention can be directly implemented as a hardware processor, or can be implemented by a combination of hardware and software modules in the processor.

[0133] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk storage.

[0134] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

[0135] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0136] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0137] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0138] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0139] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0140] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0141] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0142] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0143] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0144] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for determining display delay, characterized in that: The method comprises: Obtaining a first receiving duration and a second receiving duration of a target backlight partition in a backlight module, wherein the first receiving duration is used to indicate the duration for the target backlight partition to receive a single frame of display data sent by a backlight control chip, and the second receiving duration is used to indicate the duration for a display screen corresponding to the target backlight partition to receive a single frame of display data sent by a display screen control chip; A display delay of the target backlight partition relative to the corresponding display screen is determined according to the first receiving time length and the second receiving time length.

2. The method according to claim 1, characterized in that The obtaining of the first receiving duration and the second receiving duration of the target backlight partition in the backlight module includes: Acquire a first receiving duration and a second receiving duration of a reference backlight partition in the backlight module, wherein the reference backlight partition refers to a backlight partition in the same row or column as the target backlight partition; A first receiving time length and a second receiving time length of the target backlight partition are determined according to a relative position relationship between the target backlight partition and the reference backlight partition.

3. The method according to claim 2, characterized in that The obtaining of the first receiving duration of the reference backlight partition includes: Acquire a third receiving duration of the backlight driving chip driving the reference backlight partition, wherein the third receiving duration is used to indicate the duration of receiving the single frame display data sent by the backlight control chip from the backlight driving chip; The first receiving duration of the reference backlight partition is determined according to the relative position of the reference backlight partition in all backlight partitions driven by the backlight driving chip and the third receiving duration of the backlight driving chip.

4. The method according to claim 2, characterized in that: The obtaining the second receiving duration of the reference backlight partition includes: Acquire the time when the display screen control chip receives the single frame display data; Obtaining the brightness change moment of the display screen corresponding to the reference backlight partition; A second receiving duration of the reference backlight partition is determined according to the acquisition time and the brightness change time.

5. The method according to claim 4, characterized in that The step of obtaining the brightness change moment of the display screen corresponding to the reference backlight partition comprises: The brightness change moment is determined according to the brightness data of the display screen corresponding to the reference backlight partition, wherein the brightness data includes a voltage value obtained by detecting the brightness of the display screen by a photoelectric probe, and the voltage value is related to the brightness.

6. The method according to claim 5, characterized in that The brightness change moment includes a first jump moment or a second jump moment of a voltage value, wherein the first jump moment is used to indicate that the voltage value jumps from a first voltage to a second voltage, and the second jump moment is used to indicate that the voltage value jumps from the second voltage to the first voltage, and the first voltage is less than the second voltage.

7. The method according to any one of claims 2 to 6, characterized in that: The number of the reference backlight partitions is not less than 2.

8. A backlight control method, characterized in that: The method comprises: Obtaining a first receiving duration of a target backlight partition in a backlight module and a second receiving duration of a display screen corresponding to the target backlight partition, wherein the first receiving duration is used to indicate that the target backlight partition receives a single frame of display data sent by a backlight control chip, and the second receiving duration is used to indicate that the display screen receives a single frame of display data sent by a display screen control chip; Determining a display delay of the target backlight partition relative to the corresponding display screen according to the first receiving time length and the second receiving time length; According to the display delay of the target backlight partition, the target backlight partition is controlled to display the single frame display data.

9. A display delay determination system, characterized in that: The system includes a photoelectric probe and a delay processor, wherein the photoelectric probe is used to detect the brightness data of the display screen and determine the corresponding voltage value; The delay processor is connected to the photoelectric probe, and is used to obtain the voltage value output by the photoelectric probe, and determine the display delay of the target backlight partition according to the voltage value, specifically for executing the method steps described in claims 1-7.

10. An electronic device, characterized in that: The electronic device comprises: a memory and a processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 7.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

12. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 7 when being executed by a processor.

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