Display device and black insertion display method

Abstract

The present application provides embodiments belonging to display technology, providing a display device and a black insertion display method. The display device includes a display panel, a backlight module, a timing control board and a processor, and the backlight module includes a driving circuit and a backlight source. After the processor obtains the liquid crystal response time of the pixel points corresponding to the current frame image, it determines the black insertion time corresponding to the different partitions according to the liquid crystal response time of the pixel points in different partitions of the display panel. Then, for each partition, the driving circuit turns off the backlight source corresponding to the partition during the black insertion time corresponding to the partition. This solution improves the matching degree between the black insertion time and the liquid crystal response time by corresponding different black insertion times to different partitions, and effectively improves the tailing phenomenon.

Description

Technical Field

[0001] The embodiments of the present application relate to display technology, and more specifically, to a display device and a black insertion display method. Background Art

[0002] With the development of science and technology, display devices have evolved from the original cathode ray tube (CRT) display devices to the current liquid crystal display devices. When the liquid crystal display device displays an image, the liquid crystal molecules corresponding to each pixel will rotate to the corresponding position according to the grayscale value corresponding to the current frame image to achieve color adjustment. The rotation time of the liquid crystal molecules is also called the liquid crystal response time. For a pixel, the greater the difference between the grayscale value of the previous frame image and the current frame image, the longer the liquid crystal response time. When the grayscale value corresponding to the current frame image is received, the pixel will still display the color in the previous frame image, and a tailing phenomenon will occur.

[0003] In the prior art, in order to alleviate the tailing phenomenon, the black frame insertion (BFI) technology is usually used to divide the time corresponding to a frame of image into a black insertion time and a non-black insertion time in sequence; the moment when the liquid crystal molecules start to rotate is the same as the starting moment of the black insertion time. When the liquid crystal molecules start to rotate, the backlight source is turned off and the backlight source is kept off during the black insertion time, which can effectively alleviate the tailing phenomenon.

[0004] However, for different pixels, if the grayscale values ​​in the previous frame image are different, or the grayscale values ​​in the current frame image are different, the liquid crystal response time of the corresponding liquid crystal molecules is also different, which will cause the black insertion time and the liquid crystal response time to match less well and the tailing phenomenon to be more serious. Summary of the invention

[0005] The embodiments of the present application provide a display device and a black insertion display method, which are used to solve the problem that in the black insertion display method in the prior art, all pixels correspond to the same black insertion time, resulting in a low matching degree between the black insertion time and the liquid crystal response time, and a more serious tailing phenomenon.

[0006] In a first aspect, an embodiment of the present application provides a display device, the display device comprising:

[0007] Display panel, backlight module, timing control board and processor, the backlight module includes a driving circuit and a backlight source;

[0008] The processor is configured to:

[0009] Get the liquid crystal response time of the pixel point corresponding to the current frame image;

[0010] Determining black insertion times corresponding to different partitions according to liquid crystal response times of pixel points in different partitions of the display panel;

[0011] The timing control board is configured to: when the current time reaches the start time of the black insertion time corresponding to the partition, control the liquid crystal molecules in the partition to start rotating;

[0012] The driving circuit is configured to turn off the backlight source corresponding to the partition during the black insertion time.

[0013] The beneficial effect of this embodiment is that the processor determines the black insertion time corresponding to different partitions according to the liquid crystal response time of the pixels in different partitions of the display panel. Then, for each partition, the driving circuit turns off the backlight source corresponding to the partition during the black insertion time corresponding to the partition. Different partitions correspond to different black insertion times, which improves the matching degree between the black insertion time and the liquid crystal response time, and effectively improves the tailing phenomenon.

[0014] In some embodiments of the present application, the black insertion time is an average value or a maximum value of the liquid crystal response time of the pixels in the partition.

[0015] The beneficial effect of this embodiment is that by using the average or maximum value of the liquid crystal response time of the pixels in the partition as the black insertion time, the matching degree between the black insertion time and the liquid crystal response time can be improved, and the tailing phenomenon can be effectively improved.

[0016] In some embodiments of the present application, the processor is further configured to:

[0017] Determine a target duty cycle and a target current value according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle of the pulse width modulation (PWM) signal, the PWM period of the pulse width modulation signal, and the initial current value;

[0018] Wherein, the pulse width modulation signal is used to control the turning on and off of the backlight source;

[0019] The driving circuit is further configured to control the backlight source corresponding to the partition to operate according to the pulse width modulation signal of the target duty cycle and the target current value during the non-black insertion time included in the display time except the black insertion time.

[0020] The beneficial effects of this embodiment are as follows: by determining the target duty cycle and target current, and then controlling the backlight source corresponding to the partition according to the pulse width modulation signal of the target duty cycle and the target current value during the non-black insertion time, the display brightness is effectively improved.

[0021] In some embodiments of the present application, the processor is configured to determine the target duty cycle and the target current value according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle of the pulse width modulation signal, the PWM period of the pulse width modulation signal, and the initial current value, and is specifically configured as follows:

[0022] Calculate the dimming start time according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle, and the PWM period;

[0023] The target duty cycle and the target current value are determined according to the relationship between the dimming on time and the PWM period, and the initial current value.

[0024] The beneficial effect of this embodiment is that by first calculating the dimming start time, and then determining the target duty cycle and target current value according to the relationship between the dimming start time and the PWM period, the determined target duty cycle and target current value are more accurate.

[0025] In some embodiments of the present application, when the processor is configured to determine the target duty cycle and the target current value according to the relationship between the dimming start time and the PWM period, and the initial current value, the processor is specifically configured as follows:

[0026] Determine whether the dimming on time is greater than the PWM period;

[0027] If the dimming on time is less than or equal to the PWM period, the target duty cycle and the target current value are determined in a first setting mode according to the initial current value, the dimming on time and the PWM period;

[0028] If the dimming on time is greater than the PWM period, the target duty cycle and the target current value are determined using a second setting mode according to the initial current value;

[0029] The first setting mode only adjusts the duty cycle of the pulse width modulation signal, and the second setting mode adjusts the current value and the duty cycle of the pulse width modulation signal.

[0030] The beneficial effects of this embodiment are as follows: when the dimming on time is less than or equal to the PWM period, the first setting mode is used to determine the target duty cycle and the target current value; when the dimming on time is greater than the PWM period, the second setting mode is used to determine the target duty cycle and the target current value, so that the determined target duty cycle and target current value are more accurate.

[0031] In some embodiments of the present application, the first setting mode is:

[0032] The ratio of the dimming on time to the PWM period is used as the target duty cycle;

[0033] The initial current value is used as the target current value.

[0034] The beneficial effects of this embodiment are as follows: in the first setting mode, the ratio of the dimming on time to the PWM period is used as the target duty cycle; the initial current value is used as the target current value, so that the display brightness can be increased only by adjusting the duty cycle of the pulse width modulation signal.

[0035] In some embodiments of the present application, the second setting mode is:

[0036] Setting the target duty cycle to 100%;

[0037] Divide the ratio of the non-black insertion time to the display time by the initial duty cycle to obtain a brightness compensation value;

[0038] The target current value is obtained according to the brightness compensation value, the initial current value, and a corresponding relationship between a preset current and a brightness index value.

[0039] The beneficial effects of this embodiment are as follows: in the second setting mode, the target duty cycle is set to 100%, and then the target current value is determined according to the brightness compensation value and the initial current value, so that when the duty cycle of the pulse width modulation signal cannot reach the original brightness, the display brightness can be improved by continuing to increase the current.

[0040] In some embodiments of the present application, when the processor is configured to obtain the target current value according to the brightness compensation value, the initial current value, and the corresponding relationship between the preset current and the brightness index value, it is specifically configured as follows:

[0041] Determining an initial brightness index value corresponding to the initial current value according to the corresponding relationship between the preset current and the brightness index value;

[0042] Taking the sum of the initial brightness index value and the brightness compensation value as a brightness index sum value;

[0043] According to the correspondence between the preset current and the brightness index value, the target current value corresponding to the brightness index value is determined.

[0044] The beneficial effect of this embodiment is that the target current value is obtained according to the brightness compensation value and the initial current value in combination with the corresponding relationship between the preset current and the brightness index value, so that the obtained target current value is more accurate.

[0045] In some embodiments of the present application, the dimming start time

[0046] Wherein, D represents the initial duty cycle, t represents the PWM period, T represents the display time, and T1 represents the black insertion time.

[0047] Beneficial effect of this embodiment: the dimming on time is calculated by the formula, so that the calculated dimming on time is more accurate.

[0048] In a second aspect, an embodiment of the present application provides a black insertion display method, comprising:

[0049] Determine the black insertion time corresponding to different partitions in the display panel;

[0050] When the current time reaches the start time of the black insertion time corresponding to the partition, controlling the liquid crystal molecules in the partition to start rotating;

[0051] During the black insertion time, the backlight source corresponding to the partition is turned off.

[0052] The beneficial effect of this embodiment is that by determining the black insertion time corresponding to different partitions in the display panel, the backlight source corresponding to each partition is turned off during the black insertion time corresponding to the partition. Different partitions correspond to different black insertion times, which improves the matching degree between the black insertion time and the liquid crystal response time and effectively improves the tailing phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0054] Figure 1 A schematic diagram of the structure of the display device provided in this application;

[0055] Figure 2 The timing of the rotation angle of the liquid crystal molecules and the PWM signal provided in this application Figure 1 ;

[0056] Figure 3 The timing of the rotation angle of the liquid crystal molecules and the PWM signal provided in this application Figure 2 ;

[0057] Figure 4 A flowchart of the black insertion display method provided in this application;

[0058] Figure 5 This is a timing diagram of the PWM signal after black display provided by this application;

[0059] Figure 6Schematic diagram of the process of determining the target duty cycle and target current value provided for this application Figure 1 ;

[0060] Figure 7 Schematic diagram of the process of determining the target duty cycle and target current value provided for this application Figure 2 ;

[0061] Figure 8 A schematic diagram of the corresponding relationship between the preset current and the brightness index value provided in this application;

[0062] Fig. 9 This is a schematic structural diagram of an embodiment of a black insertion display device provided in the present application. DETAILED DESCRIPTION

[0063] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0064] Based on the exemplary embodiments described in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the claims attached to this application. In addition, although the disclosure in this application is introduced according to one or several exemplary examples, it should be understood that each aspect of the disclosure can also constitute a complete implementation method separately.

[0065] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0066] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise indicated. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, for example, they can be implemented according to orders other than those given in the diagrams or descriptions of the embodiments of this application.

[0067] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0068] With the development of technology, liquid crystal display devices are popular among people due to their small size and low energy consumption. Figure 1 A schematic diagram of the structure of the display device provided in this application, such as Figure 1 As shown, the display device is a liquid crystal display device, which includes a display panel, a backlight module, a timing control (Timing Controller, abbreviated as: TCON) board and a processor, and the backlight module includes a driving circuit and a backlight source.

[0069] The processor is connected to the TCON board and the driving circuit respectively. The TCON board is connected to the display panel. The TCON board controls the liquid crystal molecules in the display panel to rotate.

[0070] The driving circuit is connected to the backlight source, and the driving circuit controls the turning on and off of the backlight source, which provides backlight for the display panel.

[0071] When the liquid crystal display device displays an image, the liquid crystal molecules corresponding to each pixel in the display panel will rotate to the corresponding position according to the grayscale value corresponding to the current frame image to achieve color adjustment, and the backlight source will light up to provide backlight. The rotation time of the liquid crystal molecules is also called the liquid crystal response time. For a pixel, the greater the difference between the grayscale value of the previous frame image and the current frame image, the longer the liquid crystal response time. When the grayscale value corresponding to the current frame image is received, the pixel will still display the color in the previous frame image, and a tailing phenomenon will occur.

[0072] For example, Figure 2 The timing of the rotation angle of the liquid crystal molecules and the pulse width modulation (PWM) signal provided in this application Figure 1 ,like Figure 2 As shown, during the display time T corresponding to the current frame image, the liquid crystal molecules rotate within the liquid crystal response time T2, and the driving circuit controls the turning on and off of the backlight source according to the PWM signal. When the PWM signal is at a low level, the backlight source is turned on; when the PWM signal is at a high level, the backlight source is turned off.

[0073] It can be seen that during the rotation of the liquid crystal molecules, the backlight source will light up and a tailing phenomenon will occur.

[0074] In the prior art, in order to alleviate the tailing phenomenon, the black frame insertion (BFI) technology is usually used to divide the time corresponding to a frame of image into a black insertion time and a non-black insertion time in sequence; the moment when the liquid crystal molecules start to rotate is the same as the starting moment of the black insertion time. When the liquid crystal molecules start to rotate, the backlight source is turned off and the backlight source is kept off during the black insertion time, which can effectively alleviate the tailing phenomenon.

[0075] For example, Figure 3 The timing of the rotation angle of the liquid crystal molecules and the PWM signal provided in this application Figure 2 ,like Figure 3 As shown, the display time T corresponding to the current frame image is divided into black insertion time T1 and non-black insertion time. During the black insertion time T1, the PWM signal is at a high level, and the backlight source is turned off, which can alleviate the tailing phenomenon.

[0076] However, in the entire display panel, different liquid crystal molecules correspond to different liquid crystal response times, which will lead to a low matching degree between the black insertion time and the liquid crystal response time, and a more serious tailing phenomenon. Figure 3 In the embodiment, the liquid crystal response time T2 is less than the black insertion time T1, and the liquid crystal response time T3 is greater than the black insertion time T1.

[0077] In response to the problems existing in the prior art, the inventors discovered during the research on the black insertion display method that for a display device capable of regional dimming, there are multiple partitions in the display panel, each partition corresponds to a backlight source, and the driving circuit can control each backlight source individually, and each backlight source provides backlight for its corresponding partition.

[0078] For each partition, the black insertion time corresponding to the partition can be determined according to the liquid crystal response time of the pixels in the partition, and then the backlight source corresponding to the partition is turned off during the black insertion time. Different partitions correspond to different black insertion times, which can improve the matching degree between the black insertion time and the liquid crystal response time and improve the tailing phenomenon. Based on the above inventive concept, the black insertion display scheme in this application is designed.

[0079] The following is an example of an application scenario of the black insertion display method provided in this application.

[0080] For example, in this scenario, the user uses a display device to watch a video. After the display device obtains a current frame image, the liquid crystal response time of the pixel corresponding to the current frame image can be determined according to the grayscale difference between the grayscale value of the pixel corresponding to the previous frame image of the current frame image and the grayscale value of the pixel corresponding to the current frame image;

[0081] Then, according to the liquid crystal response time of the pixels in different partitions, the black insertion time corresponding to the different partitions is determined;

[0082] For each partition, when the current time reaches the start time of the black insertion time corresponding to the partition, the liquid crystal molecules in the partition are controlled to start rotating;

[0083] During the black insertion time corresponding to the partition, the backlight source corresponding to the partition is turned off.

[0084] In addition, the target duty cycle and target current value corresponding to the partition can also be determined. During the display time corresponding to the current frame image, including the non-black time excluding the black time, the backlight source corresponding to the partition is controlled according to the pulse width modulation signal of the target duty cycle and the target current value, thereby improving the display brightness.

[0085] It should be noted that the above scenario is only an example of an application scenario provided by an embodiment of the present application. The embodiment of the present application does not limit the actual form of the various devices included in the scenario. In the specific application of the solution, it can be set according to actual needs.

[0086] The technical solution of the present application is described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0087] Figure 4 This is a flow chart of the black insertion display method provided in the present application. The executor of the method is a display device capable of performing regional dimming. The method in this embodiment can be implemented by software, hardware, or a combination of software and hardware.

[0088] like Figure 4 As shown, the processor in the display device is configured to perform the following steps:

[0089] S401: Obtaining the liquid crystal response time of the pixel point corresponding to the current frame image.

[0090] After acquiring the current frame image, the processor needs to acquire the liquid crystal response time of the pixel point corresponding to the current frame image.

[0091] Specifically, the liquid crystal response time of the pixel corresponding to the current frame image can be obtained based on the grayscale value of the pixel corresponding to the previous frame image of the current frame image, the grayscale value of the pixel corresponding to the current frame image, and the overdrive table.

[0092] That is, for each pixel, the corresponding time between the grayscale value of the pixel in the previous frame image of the current frame image and the grayscale value of the pixel in the current frame image is found from the overdrive table to obtain the liquid crystal response time corresponding to the pixel.

[0093] S402: Determine black insertion times corresponding to different partitions according to liquid crystal response times of pixels in different partitions of the display panel.

[0094] After the processor obtains the liquid crystal response time of the pixel, for each partition in the display panel, the black insertion time corresponding to the partition can be determined according to the liquid crystal response time of the pixel in the partition.

[0095] The average value or maximum value of the liquid crystal response time of the pixels in the partition may be used as the black insertion time corresponding to the partition.

[0096] It should be noted that a preset number of pixels can also be selected from the partition, and the average or maximum value of the liquid crystal response time of the preset number of pixels can be used as the black insertion time. The preset number can be 300, 500, 700, etc. The embodiment of the present application does not limit the preset number, and it can be set according to actual conditions.

[0097] The timing control board is configured to: for each partition, when the current time reaches the start time of the black insertion time corresponding to the partition, control the liquid crystal molecules in the partition to start rotating. The driving circuit is configured to: for each partition, during the black insertion time corresponding to the partition, turn off the backlight source corresponding to the partition.

[0098] The display device provided in this embodiment includes a display panel, a backlight module, a timing control board and a processor, and the backlight module includes a driving circuit and a backlight source. After the processor obtains the liquid crystal response time of the pixel points corresponding to the current frame image, it determines the black insertion time corresponding to the different partitions according to the liquid crystal response time of the pixel points in the different partitions of the display panel. Then, for each partition, the driving circuit turns off the backlight source corresponding to the partition during the black insertion time corresponding to the partition. This solution improves the matching degree between the black insertion time and the liquid crystal response time by corresponding different black insertion times to different partitions, and effectively improves the tailing phenomenon. In addition, the maximum value or average value of the liquid crystal response time of the pixel points included in the backlight area is used as the black insertion time, which effectively improves the tailing phenomenon.

[0099] The following describes a situation in which the display brightness can be increased after the processor determines the black insertion time.

[0100] There are two ways to adjust the display brightness of pixels. The first is to adjust through PWM signal. When the current of the backlight source is fixed, the display brightness can be adjusted by adjusting the duty cycle of the PWM signal. The larger the duty cycle, the higher the display brightness. The second is to adjust the display brightness by adjusting the current of the backlight source. The larger the current, the greater the display brightness.

[0101] Combination Figure 2 and Figure 3 It is known that in Figure 2 The duty cycle of the PWM signal is the initial duty cycle D. Figure 3 In the example, the duty cycle of the PWM signal is because Therefore, after the black insertion display is performed, the display brightness will be reduced. In order to make the display brightness after the black insertion display consistent with the display brightness before the black insertion display, the display brightness needs to be increased.

[0102] Based on the above embodiments, the embodiments of the present application describe the operation of the backlight source controlled by the pulse width modulation signal of the target duty cycle and the target current value during the non-black insertion time after the processor determines the target duty cycle and the target current value.

[0103] After the processor in the display device determines the black insertion time, in order to improve the display brightness, it is necessary to first determine the target duty cycle and target current value based on the black insertion time, the display time corresponding to the current frame image, the initial duty cycle of the pulse width modulation signal, the PWM period of the pulse width modulation signal, and the initial current value. The pulse width modulation signal is used to control the turning on and off of the backlight source.

[0104] For example, Figure 5 The timing diagram of the PWM signal after black insertion provided by this application is as follows: Figure 5 As shown, the display time corresponding to the current frame image is T, the black insertion time is T1, the PWM period of the pulse width modulation signal is t, and the initial duty cycle of the pulse width modulation signal is D=t2 / t.

[0105] Specifically, Figure 6 Schematic diagram of the process of determining the target duty cycle and target current value provided for this application Figure 1 , wherein the processor in the display device is configured to perform the following steps:

[0106] S601: Calculate the dimming start time according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle, and the PWM period.

[0107] Since there are two ways to adjust the display brightness of pixels, the first adjustment method has lower energy consumption, so the first adjustment method is used first; after adjusting the display brightness using the first adjustment method, if it still cannot reach the display brightness before black insertion, then the second adjustment method is used for adjustment.

[0108] According to the formula Calculate the dimming on time; where t1 represents the dimming on time, D represents the initial duty cycle, t represents the PWM period, T represents the display time, and T1 represents the black insertion time.

[0109] The dimming on time is also the low level time in the PWM period t of the pulse width modulation signal.

[0110] S602: Determine a target duty cycle and a target current value according to the relationship between the dimming on time and the PWM period, and the initial current value.

[0111] After the processor obtains the dimming on time, it can determine the target duty cycle and target current value according to the relationship between the dimming on time and the PWM period and the initial current value.

[0112] When the dimming on time is less than or equal to the PWM period, the duty cycle is adjusted to obtain the target duty cycle, and the initial current value is used as the target current value; when the dimming on time is greater than the PWM period, the duty cycle and current value are adjusted to obtain the target duty cycle and target current value.

[0113] The driving circuit is also configured to: for each partition, during the non-black insertion time included in the display time except the black insertion time corresponding to the partition, control the operation of the backlight source corresponding to the partition according to the pulse width modulation signal of the target duty cycle corresponding to the partition and the target current value.

[0114] The display device provided in this embodiment determines the target duty cycle and the target current value, and then controls the operation of the backlight source corresponding to the partition according to the pulse width modulation signal of the target duty cycle and the target current value during the non-black insertion time, thereby effectively improving the display brightness, ensuring that the display brightness after the black insertion display is consistent with the display brightness before the black insertion display, and improving the display effect.

[0115] Furthermore, based on the above embodiments, the embodiments of the present application illustrate a situation in which the processor determines a target duty cycle and a target current value according to a relationship between a dimming start time and a PWM period. Figure 7 Schematic diagram of the process of determining the target duty cycle and target current value provided for this application Figure 2 , wherein the processor in the display device is configured to perform the following steps:

[0116] S701: Determine whether the dimming on time is greater than the PWM period; if the dimming on time is less than or equal to the PWM period, execute step S702; if the dimming on time is greater than the PWM period, execute step S703.

[0117] because Indicates that it is used during non-blackout time. The duty cycle of the pulse width modulation signal which is at a high level during the black insertion time. By using this duty cycle, the display brightness after adjustment can be consistent with the display brightness before the black insertion.

[0118] Therefore, if the dimming on time is less than or equal to the PWM period, it means that the display brightness after adjustment can be consistent with the display brightness before black insertion by using only the first adjustment method.

[0119] If the dimming on time is greater than the PWM period, it means that in addition to using the first adjustment method, the second adjustment method is also needed to adjust the display brightness.

[0120] After obtaining the dimming on time, the processor determines whether the dimming on time is greater than the PWM period.

[0121] S702: According to the initial current value, the dimming start time and the PWM period, a first setting mode is adopted to determine a target duty cycle and a target current value.

[0122] When the dimming on time is less than or equal to the PWM period, the target duty cycle and the target current value are determined using the first setting mode according to the initial current value, the dimming on time and the PWM period. The first setting mode only adjusts the duty cycle of the pulse width modulation signal.

[0123] The first setting mode is: taking the ratio of the dimming on time to the PWM period as the target duty cycle; taking the initial current value as the target current value.

[0124] S703: According to the initial current value, a target duty cycle and a target current value are determined using a second setting mode.

[0125] When the dimming on time is greater than the PWM period, the target duty cycle and the target current value are determined using the second setting mode according to the initial current value. The second setting mode adjusts the current value and the duty cycle of the pulse width modulation signal.

[0126] The second setting mode is:

[0127] Set the target duty cycle to 100%.

[0128] The ratio of the non-black insertion time to the display time is divided by the initial duty cycle to obtain the brightness compensation value.

[0129] The target current value is obtained according to the brightness compensation value, the initial current value, and the corresponding relationship between the preset current and the brightness index value.

[0130] First, according to the correspondence between the preset current and the brightness index value, the initial brightness index value corresponding to the initial current value is determined; then the sum of the initial brightness index value and the brightness compensation value is used as the brightness index sum value; and then according to the correspondence between the preset current and the brightness index value, the target current value corresponding to the brightness index sum value is determined.

[0131] For example, Figure 8 A schematic diagram of the corresponding relationship between the preset current and the brightness index value provided in this application, such as Figure 8 As shown, the larger the current value, the larger the brightness index value. The initial current value is 5mA, the corresponding initial brightness index value is 100%, the brightness compensation value is 20%, and the brightness index value is 120% = 100% + 20%, and the corresponding target current value is 12.5mA.

[0132] The display device provided in this embodiment uses the ratio of the dimming on time to the PWM period as the target duty cycle when the dimming on time is less than or equal to the PWM period; and uses the initial current value as the target current value, so as to improve the display brightness only by adjusting the duty cycle of the pulse width modulation signal, thereby effectively saving energy consumption.

[0133] When the dimming on time is greater than the PWM period, the target duty cycle is set to 100%, and then the target current value is determined according to the brightness compensation value and the initial current value. When the duty cycle of the pulse width modulation signal cannot reach the display brightness before the black insertion, the display brightness can be increased to the display brightness before the black insertion by continuing to increase the current.

[0134] In the present application, a black insertion display method is also provided, and the steps may be:

[0135] Determine the black insertion time corresponding to different partitions in the display panel.

[0136] When the current time reaches the start time of the black insertion time corresponding to the partition, the liquid crystal molecules in the partition are controlled to start rotating;

[0137] During the black insertion time, turn off the backlight corresponding to the partition.

[0138] For specific implementation steps and technical effects, please refer to the above embodiments, and this application will not repeat them.

[0139] Fig. 9 This is a schematic diagram of the structure of the black insertion display device embodiment provided by the present application; the device can be integrated into the display device in the above method embodiment, or can be implemented by the display device in the above method embodiment. Fig. 9 As shown, the black insertion display device 90 includes:

[0140] The acquisition module 91 is used to acquire the liquid crystal response time of the pixel point corresponding to the current frame image.

[0141] A processing module 92, configured to determine black insertion times corresponding to different partitions according to liquid crystal response times of pixels in different partitions of the display panel;

[0142] The display module 93 is used for:

[0143] When the current time reaches the start time of the black insertion time corresponding to the partition, controlling the liquid crystal molecules in the partition to start rotating;

[0144] During the black insertion time, the backlight source corresponding to the partition is turned off.

[0145] Furthermore, the black insertion time is an average value or a maximum value of liquid crystal response time of pixels in the partition.

[0146] Further, the processing module 92 is further used to determine a target duty cycle and a target current value according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle of the pulse width modulation PWM signal, the PWM period of the pulse width modulation signal, and the initial current value;

[0147] Wherein, the pulse width modulation signal is used to control the turning on and off of the backlight source;

[0148] Furthermore, the display module 93 is also used to control the operation of the backlight source corresponding to the partition according to the pulse width modulation signal of the target duty cycle and the target current value during the non-black insertion time included in the display time except the black insertion time.

[0149] Furthermore, the processing module 92 is also used for:

[0150] Calculate the dimming start time according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle, and the PWM period;

[0151] The target duty cycle and the target current value are determined according to the relationship between the dimming on time and the PWM period, and the initial current value.

[0152] Furthermore, the processing module 92 is also used for:

[0153] Determine whether the dimming on time is greater than the PWM period;

[0154] If the dimming on time is less than or equal to the PWM period, the target duty cycle and the target current value are determined in a first setting mode according to the initial current value, the dimming on time and the PWM period;

[0155] If the dimming on time is greater than the PWM period, the target duty cycle and the target current value are determined using a second setting mode according to the initial current value;

[0156] The first setting mode only adjusts the duty cycle of the pulse width modulation signal, and the second setting mode adjusts the current value and the duty cycle of the pulse width modulation signal.

[0157] Furthermore, the first setting mode is:

[0158] The ratio of the dimming on time to the PWM period is used as the target duty cycle;

[0159] The initial current value is used as the target current value.

[0160] Furthermore, the second setting mode is:

[0161] Setting the target duty cycle to 100%;

[0162] Divide the ratio of the non-black insertion time to the display time by the initial duty cycle to obtain a brightness compensation value;

[0163] The target current value is obtained according to the brightness compensation value, the initial current value, and a corresponding relationship between a preset current and a brightness index value.

[0164] Furthermore, the processing module 92 is also used for:

[0165] Determining an initial brightness index value corresponding to the initial current value according to the corresponding relationship between the preset current and the brightness index value;

[0166] Taking the sum of the initial brightness index value and the brightness compensation value as a brightness index sum value;

[0167] According to the correspondence between the preset current and the brightness index value, the target current value corresponding to the brightness index value is determined.

[0168] Furthermore, the dimming start time

[0169] Wherein, D represents the initial duty cycle, t represents the PWM period, T represents the display time, and T1 represents the black insertion time.

[0170] The black insertion display device provided in this embodiment is used to implement the technical solution in any of the above embodiments. Its implementation principle and technical effect are similar and will not be described in detail here.

[0171] An embodiment of the present application also provides a readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the technical solution provided in any of the aforementioned embodiments is implemented.

[0172] An embodiment of the present application also provides a computer program product, including a computer program, which is used to implement the technical solution provided by any of the aforementioned embodiments when executed by a processor.

[0173] 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.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0175] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A display device, characterized in that: The display device comprises: Display panel, backlight module, timing control board and processor, the backlight module includes a driving circuit and a backlight source; The processor is configured to: Get the liquid crystal response time of the pixel point corresponding to the current frame image; Determining black insertion times corresponding to different partitions according to liquid crystal response times of pixel points in different partitions of the display panel; The timing control board is configured to: when the current time reaches the start time of the black insertion time corresponding to the partition, control the liquid crystal molecules in the partition to start rotating; The driving circuit is configured to turn off the backlight source corresponding to the partition during the black insertion time.

2. The display device according to claim 1, characterized in that The black insertion time is an average value or a maximum value of the liquid crystal response time of the pixels in the partition.

3. The display device according to claim 1, characterized in that The processor is further configured to: Determine a target duty cycle and a target current value according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle of the pulse width modulation (PWM) signal, the PWM period of the pulse width modulation signal, and the initial current value; Wherein, the pulse width modulation signal is used to control the turning on and off of the backlight source; The driving circuit is further configured to control the backlight source corresponding to the partition to operate according to the pulse width modulation signal of the target duty cycle and the target current value during the non-black insertion time included in the display time except the black insertion time.

4. The display device according to claim 3, characterized in that When the processor is configured to determine the target duty cycle and the target current value according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle of the pulse width modulation signal, the PWM period of the pulse width modulation signal, and the initial current value, the processor is specifically configured as follows: Calculate the dimming start time according to the black insertion time, the display time corresponding to the current frame image, the initial duty cycle, and the PWM period; The target duty cycle and the target current value are determined according to the relationship between the dimming on time and the PWM period, and the initial current value.

5. The display device according to claim 4, characterized in that When the processor is configured to determine the target duty cycle and the target current value according to the relationship between the dimming start time and the PWM period, and the initial current value, the processor is specifically configured as follows: Determine whether the dimming on time is greater than the PWM period; If the dimming on time is less than or equal to the PWM period, the target duty cycle and the target current value are determined in a first setting mode according to the initial current value, the dimming on time and the PWM period; If the dimming on time is greater than the PWM period, the target duty cycle and the target current value are determined using a second setting mode according to the initial current value; The first setting mode only adjusts the duty cycle of the pulse width modulation signal, and the second setting mode adjusts the current value and the duty cycle of the pulse width modulation signal.

6. The display device according to claim 5, characterized in that The first setting mode is: The ratio of the dimming on time to the PWM period is used as the target duty cycle; The initial current value is used as the target current value.

7. The display device according to claim 5, characterized in that The second setting mode is: Setting the target duty cycle to 100%; Divide the ratio of the non-black insertion time to the display time by the initial duty cycle to obtain a brightness compensation value; The target current value is obtained according to the brightness compensation value, the initial current value, and a corresponding relationship between a preset current and a brightness index value.

8. The display device according to claim 7, characterized in that When the processor is configured to obtain the target current value according to the brightness compensation value, the initial current value, and the corresponding relationship between the preset current and the brightness index value, the processor is specifically configured as follows: Determining an initial brightness index value corresponding to the initial current value according to the corresponding relationship between the preset current and the brightness index value; Taking the sum of the initial brightness index value and the brightness compensation value as a brightness index sum value; According to the correspondence between the preset current and the brightness index value, the target current value corresponding to the brightness index value is determined.

9. The display device according to claim 4, characterized in that: The dimming start time Wherein, D represents the initial duty cycle, t represents the PWM period, T represents the display time, and T1 represents the black insertion time.

10. A black insertion display method, characterized in that: include: Determine the black insertion time corresponding to different partitions in the display panel; When the current time reaches the start time of the black insertion time corresponding to the partition, controlling the liquid crystal molecules in the partition to start rotating; During the black insertion time, the backlight source corresponding to the partition is turned off.

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