A black insertion display method, dimming controller and backlight system

Abstract

The present invention discloses a black insertion display method, a dimming controller and a backlight system. After receiving a local dimming signal, the dimming controller determines the refresh rate according to the frame synchronization signal in the local dimming signal, and then searches for the display-related duration corresponding to the refresh rate from a first corresponding relationship, and finally sends the display-related duration and local backlight data to the local dimmer. The local dimmer controls the light-emitting device to emit light and stop emitting light based on the local backlight data, the delay duration, the display duration and the black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration. Since the dimming controller first determines the refresh rate according to the frame synchronization signal, and then searches for the display-related duration corresponding to the refresh rate from a preset first corresponding relationship, and the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration, black insertion in VRR mode can be achieved, thereby improving the flexibility of the black frame insertion technology.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a black insertion display method, a dimming controller and a backlight system. Background Art

[0002] In order to achieve better motion display effects and reduce problems such as tailing, screen tearing and ghosting, existing LCD displays usually require Mini-LED backlight panels to cooperate with LCD (Liquid Crystal Display) for display, and perform black insertion on the Mini-LED backlight, turning off the backlight when the LCD is in the flip state, thereby avoiding the time when the LCD is flipping and should not be displayed.

[0003] BFI (Black Frame Insertion) technology is a technology used to enhance the dynamic display effect on Mini-LED backlight panels. BFI technology usually sets three durations: delay duration, display duration, and black frame insertion duration.

[0004] In the prior art, usually only the time parameters under a fixed refresh rate are set, and there is currently no specific implementation solution for the BFI implementation in a VRR (Variable Refresh Rate) mode. Summary of the invention

[0005] The present invention provides a black insertion display method, a dimming controller and a backlight system, which are used to solve the problem of how to implement the BFI technology in a VRR mode.

[0006] In a first aspect, the present application provides a black insertion display method, comprising:

[0007] The dimming controller receives a local dimming signal, wherein the local dimming signal includes a frame synchronization signal and local backlight data;

[0008] The dimming controller determines a refresh rate according to a frame synchronization signal in the local dimming signal;

[0009] The dimming controller searches for a display-related duration corresponding to the refresh rate from a preset first corresponding relationship;

[0010] The dimming controller sends the local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, delay duration, display duration and black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

[0011] In a possible implementation, the dimming controller determines a refresh rate according to a frame synchronization signal in the local dimming signal, including:

[0012] The dimming controller identifies a rising edge or a falling edge of a frame synchronization signal in the received local dimming signal;

[0013] The dimming controller determines a frame synchronization duration between two adjacent rising edges identified, or determines a frame synchronization duration between two adjacent falling edges identified;

[0014] The dimming controller determines the refresh rate according to the frame synchronization duration.

[0015] In a possible implementation manner, the display-related duration includes any two of the delay duration, the display duration, and the black insertion duration;

[0016] Before the dimming controller sends the local backlight data and the display-related duration to the local dimmer, the method further includes:

[0017] The dimming controller calculates a target duration according to the frame synchronization duration and the display-related duration, wherein the target duration is any one of the delay duration, the display duration, and the black insertion duration;

[0018] The method further comprises:

[0019] The dimming controller sends the target duration to the local dimmer, and the local dimmer controls the light emitting device electrically connected to the local dimmer to emit light and controls the light emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration.

[0020] In a possible implementation manner, the display-related duration includes any two of the delay duration, the display duration, and the black insertion duration, and the method further includes:

[0021] The dimming controller sends the frame synchronization duration to the local dimmer, and the local dimmer calculates the target duration according to the frame synchronization duration and the display-related duration, and then controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration, wherein the target duration is any one of the delay duration, the display duration and the black insertion duration.

[0022] In a possible implementation, after the dimming controller determines the refresh rate according to the frame synchronization signal in the local dimming signal, the method further includes:

[0023] The dimming controller searches for a brightness compensation coefficient corresponding to the refresh rate from a preset second corresponding relationship;

[0024] The dimming controller uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data;

[0025] The dimming controller sends the target local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration.

[0026] In a possible implementation, after the dimming controller searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the dimming controller further includes:

[0027] The dimming controller calculates a brightness compensation coefficient according to the display duration and the black insertion duration;

[0028] The dimming controller uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data;

[0029] The dimming controller sends the target local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration; or

[0030] After the dimming controller searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the method further includes:

[0031] The dimming controller sends the local backlight data and the display-related duration to the local dimmer. The local dimmer calculates the brightness compensation coefficient based on the display duration and the black insertion duration, and uses the product of the brightness compensation coefficient and the local backlight data as the target local backlight data. Based on the target local backlight data, the delay duration, the display duration and the black insertion duration, the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light.

[0032] In a second aspect, the present application further provides a dimming controller, comprising:

[0033] A receiving module, configured to receive a local dimming signal, wherein the local dimming signal includes a frame synchronization signal and local backlight data;

[0034] A determination module, configured to determine a refresh rate according to a frame synchronization signal in the local dimming signal;

[0035] A search module, used to search for a display-related duration corresponding to the refresh rate from a preset first corresponding relationship;

[0036] A sending module is used to send the local backlight data and the display-related duration to a local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, delay duration, display duration and black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

[0037] In a possible implementation manner, the determining module is specifically configured to:

[0038] identifying a rising edge or a falling edge of a frame synchronization signal in the received local dimming signal;

[0039] Determine the frame synchronization duration between two adjacent rising edges identified, or determine the frame synchronization duration between two adjacent falling edges identified;

[0040] The refresh rate is determined according to the frame synchronization duration.

[0041] In a possible implementation manner, the display-related duration includes any two of the delay duration, the display duration, and the black insertion duration;

[0042] Before sending the local backlight data and the display-related duration to the local dimmer, the determining module is further used to:

[0043] Calculate a target duration according to the frame synchronization duration and the display-related duration, wherein the target duration is any one of the delay duration, the display duration, and the black insertion duration;

[0044] The sending module is also used for:

[0045] The target duration is sent to the local dimmer, and the local dimmer controls a light emitting device electrically connected to the local dimmer to emit light and controls the light emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration.

[0046] In a possible implementation manner, the display-related duration includes any two of the delay duration, the display duration, and the black insertion duration;

[0047] The determination module is used to send the frame synchronization duration to the local dimmer. After the local dimmer calculates the target duration according to the frame synchronization duration and the display-related duration, the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration, wherein the target duration is any one of the delay duration, the display duration and the black insertion duration.

[0048] In a possible implementation, after determining the refresh rate according to the frame synchronization signal in the local dimming signal, the search module is further configured to:

[0049] Searching for a brightness compensation coefficient corresponding to the refresh rate from a preset second corresponding relationship; taking the product of the brightness compensation coefficient and the local backlight data as target local backlight data;

[0050] The sending module is also used for:

[0051] The target local backlight data and the display-related duration are sent to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration.

[0052] In a possible implementation, after searching the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the determination module is further configured to:

[0053] Calculating a brightness compensation coefficient according to the display duration and the black insertion duration; taking the product of the brightness compensation coefficient and the local backlight data as target local backlight data;

[0054] The sending module is further used to: send the target local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration; or

[0055] After searching the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the sending module is further used to:

[0056] The local backlight data and the display-related duration are sent to a local dimmer. The local dimmer calculates the brightness compensation coefficient according to the display duration and the black insertion duration, and uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data. Based on the target local backlight data, the delay duration, the display duration and the black insertion duration, the light-emitting device electrically connected to the local dimmer is controlled to emit light and the light-emitting device is controlled to stop emitting light.

[0057] In a third aspect, the present application further provides a backlight system, comprising a local dimmer, a light emitting device, and a dimming controller as described in any one of the second aspects;

[0058] The dimming controller, the local dimmer and the light emitting device are connected in sequence.

[0059] The beneficial effects of the present invention are as follows:

[0060] The black insertion display method, dimming controller and backlight system provided by the embodiment of the present application, after receiving the local dimming signal, the dimming controller determines the refresh rate according to the frame synchronization signal in the local dimming signal, and then searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, and finally sends the display-related duration and the local backlight data included in the local dimming signal to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the delay duration, the display duration and the black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration. Since the local dimming signal sent by the dimming controller includes the frame synchronization signal, the refresh rate is determined according to the frame synchronization signal, and then the display-related duration corresponding to the refresh rate is searched from the preset first corresponding relationship, and the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration, therefore, black insertion in VRR mode can be achieved, and the flexibility of the black frame insertion technology is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0062] Figure 1 A schematic diagram of the duration parameters corresponding to each row of backlight in a display panel provided by the related art;

[0063] Figure 2 A schematic diagram of the structure of a backlight system provided in an embodiment of the present application;

[0064] Figure 3 A schematic diagram of a flow chart of a black insertion display method provided in an embodiment of the present application;

[0065] Figure 4 A schematic diagram of identifying a rising edge of a frame synchronization signal provided in an embodiment of the present application;

[0066] Figure 5 A schematic diagram of identifying a falling edge of a frame synchronization signal provided in an embodiment of the present application;

[0067] Figure 6 A schematic diagram of the structure of a dimming controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] The BFI technology provided in the related art is usually to insert black frames at a fixed refresh rate. When inserting black frames at a fixed refresh rate, three durations are usually set: delay duration T1, display duration T2, and black insertion duration T3, where:

[0070] The delay time T1 is related to the LCD's liquid crystal response time, refresh rate, and different grayscales;

[0071] The display time T2 is related to the desired final effect. The smaller the display time T2 is set, the smaller the overlap between rows is, and the better the display effect is.

[0072] The black insertion duration T3 and the display duration T2 together constitute a frame duration.

[0073] like Figure 1 As shown in the figure, a time length parameter corresponding to each row of backlight in a backlight panel provided by the related art is obtained. Figure 1 It can be seen from the figure that from top to bottom, the delay time T1 of the backlight gradually increases, the display time T2 of each row of backlight is the same, and the black insertion time T3 of each row of backlight is also the same.

[0074] like Figure 2 FIG. 1 is a schematic diagram of a backlight system provided in an embodiment of the present application. The backlight system includes a dimming controller, a local dimmer, and a light emitting device ( Figure 1(not shown in the figure), wherein the local dimmer and the light-emitting devices constitute a backlight panel, the light-emitting devices are arranged in an array on the backlight panel, each local dimmer controls multiple light-emitting devices, and the light-emitting devices in the embodiment of the present application can be Mini-LED.

[0075] Figure 2 The backlight system includes m groups of local dimmers, each group of local dimmers includes n local dimmers connected in series, and among the n local dimmers connected in series, the first local dimmer is connected to a dimming controller.

[0076] It should be noted that Figure 2 The connection method of the local dimmers in the embodiment is only an example. In a specific implementation, all local dimmers can also be connected in series. Among the local dimmers connected in series, only one local dimmer is connected to the dimming controller. In the embodiment of the present application, there is no limitation on whether to use multiple groups of local dimmers connected in series or one group of local dimmers connected in series.

[0077] Since the related art uses black insertion display at a fixed refresh rate, the display duration T2 and the black insertion duration T3 are fixed. For each local dimmer, since the position of the Mini-LED controlled by it is fixed, the delay duration T1 corresponding to each local dimmer is also fixed. In a specific implementation, the delay duration T1, the display duration T2 and the black insertion duration T3 can be stored in the local dimmer, and the dimming controller sends local backlight data to the local dimmer. After receiving the local backlight data, the local dimmer delays for T1 duration, and the local dimmer controls the Mini-LED to emit light based on the local dimming data. After the display duration T2 ends, the Mini-LED is controlled to stop emitting light, that is, a black frame is inserted. The duration for controlling the Mini-LED to stop emitting light is the black insertion duration T3. After each row of Mini-LEDs completes the above-mentioned emission and stops emitting light, the display of one frame of image ends, wherein the delay duration T1, the display duration T2 and the black insertion duration T3 are the durations corresponding to the local dimmer.

[0078] The above is an explanation of black insertion display with a fixed refresh rate. However, there is currently no specific implementation solution for black insertion display in VRR mode.

[0079] A black insertion display method, a dimming controller and a backlight system provided in the embodiments of the present application are suitable for black insertion display in VRR mode. The embodiments of the present application are described in detail below.

[0080] like Figure 3 FIG. 1 is a flow chart of a black insertion display method provided in an embodiment of the present application, which specifically includes the following steps:

[0081] S301, a dimming controller receives a local dimming signal, wherein the local dimming signal includes a frame synchronization signal and local backlight data;

[0082] S302, the dimming controller determines a refresh rate according to a frame synchronization signal in the local dimming signal;

[0083] S303, the dimming controller searches for a display-related duration corresponding to the refresh rate from a preset first corresponding relationship;

[0084] S304, the dimming controller sends the local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, delay duration, display duration and black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

[0085] In the embodiment of the present application, after receiving the local dimming signal, the dimming controller determines the refresh rate according to the frame synchronization signal in the local dimming signal, and then searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, and finally sends the display-related duration and the local backlight data included in the local dimming signal to the local dimmer. The local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the delay duration, the display duration, and the black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration, and the black insertion duration. Since the local dimming signal sent by the dimming controller includes the frame synchronization signal, the refresh rate is determined according to the frame synchronization signal, and then the display-related duration corresponding to the refresh rate is searched from the preset first corresponding relationship, and the display-related duration includes at least two of the delay duration, the display duration, and the black insertion duration, therefore, black insertion in VRR mode can be achieved, thereby improving the flexibility of the black frame insertion technology.

[0086] In a specific implementation, the local dimming signal received by the dimming controller may be sent by a SOC (System on Chip), and the SOC and the dimming controller may communicate via a SPI (Serial Peripheral Interface), that is, the local dimming signal is SPI data.

[0087] In one embodiment, after receiving the local dimming signal, the dimming controller identifies the rising edge or falling edge of the frame synchronization signal in the local dimming signal, determines the frame synchronization duration between two adjacent rising edges identified, or determines the frame synchronization duration between two adjacent falling edges identified, and determines the refresh rate based on the frame synchronization duration.

[0088] Specifically, the reciprocal of the frame synchronization duration is used as the refresh rate, that is, the ratio of 1 to the frame synchronization duration is used as the refresh rate, wherein the frame synchronization duration is greater than zero.

[0089] like Figure 4 As shown, the dimming controller identifies the rising edge in the frame synchronization signal, determines that the frame synchronization duration between the first identified rising edge and the second identified rising edge is T4, determines that the frame synchronization duration between the second identified rising edge and the third identified rising edge is T4, and determines that the frame synchronization duration between the third identified rising edge and the fourth identified rising edge is T5.

[0090] After the dimming controller recognizes that the duration between the first rising edge and the second rising edge is T4, it determines the refresh rate to be 1 / T4. After recognizing that the duration between the second rising edge and the third rising edge is T4, it determines the refresh rate to be 1 / T4. After recognizing that the duration between the third rising edge and the fourth rising edge is T5, it determines the refresh rate to be 1 / T5.

[0091] like Figure 5 As shown, the dimming controller identifies the falling edge in the frame synchronization signal, determines that the frame synchronization duration between the first identified falling edge and the second identified falling edge is T4, determines that the frame synchronization duration between the second identified falling edge and the third identified falling edge is T4, and determines that the frame synchronization duration between the third identified falling edge and the fourth identified falling edge is T5.

[0092] After the dimming controller recognizes that the time length between the first falling edge and the second falling edge is T4, it determines the refresh rate to be 1 / T4. After recognizing that the time length between the second falling edge and the third falling edge is T4, it determines the refresh rate to be 1 / T4. After recognizing that the time length between the third falling edge and the fourth falling edge is T5, it determines the refresh rate to be 1 / T5.

[0093] After the dimming controller determines the refresh rate, it searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship. Specifically, the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

[0094] The first preset relationship in the embodiment of the present application can be presented in the form of a table, as shown in Table 1 below:

[0095] Refresh rate Show relevant duration A a B b C c D d E e F f

[0096] Table 1

[0097] The dimming controller determines that the refresh rate is A, and then searches for the display-related duration a corresponding to the refresh rate A from the first corresponding relationship.

[0098] It should be noted that the display-related durations in Table 1 include two durations or three durations, and a, b, c, d, e, and f are only used to distinguish the display-related durations, and do not represent a single duration.

[0099] In another embodiment, after the dimming controller determines the refresh rate, it can be compared with the last refresh rate determined. If they are the same, the display-related duration determined last time continues to be used. If they are different, the display-related duration corresponding to the refresh rate determined this time is searched from the first corresponding relationship.

[0100] In a specific implementation, when the display-related duration includes delay duration, display duration and black insertion duration, the dimming controller finds the delay duration T1, display duration T2 and black insertion duration T3 corresponding to the determined refresh rate from the first preset correspondence, and then sends the local backlight data, delay duration T1, display duration T2 and black insertion duration T3 to the local dimmer. After the local dimmer receives the local backlight data, delay duration T1, display duration T2 and black insertion duration T3, after the delay duration T1 ends, the light-emitting device is controlled to emit light, and the brightness of the light-emitting device is controlled based on the local backlight data. After the display duration T2 ends, the light-emitting device is controlled to stop emitting light. After the black insertion duration T3 ends, the insertion of the black frame is completed.

[0101] In one embodiment, when the display-related duration includes any two of the delay duration T1, the display duration T2, and the black insertion duration T3, the dimming controller calculates the target duration based on the frame synchronization duration and the display-related duration before sending the local backlight data and the display-related duration to the local dimmer, wherein the target duration is any one of the delay duration, the display duration, and the black insertion duration, and the dimming controller sends the target duration to the local dimmer.

[0102] It should be noted that the target duration is the delay duration, which is the duration other than the two durations included in the display-related duration and the blackout duration.

[0103] For example, the display-related duration includes the delay duration T1 and the display duration T2, and the target duration is the black insertion duration T3. The dimming controller calculates the sum of the delay duration T1 and the display duration T2, and then calculates the difference between the frame synchronization duration T and the sum, and uses the calculated difference as the black insertion duration T3. The dimming controller sends the local backlight data, the delay duration T1, the display duration T2, and the black insertion duration T3 to the local dimmer.

[0104] For another example, the display-related duration includes the delay duration T1 and the black insertion duration T3, and the target duration is the display duration T2. ​​The dimming controller calculates the sum of the delay duration T1 and the black insertion duration T3, and then calculates the difference between the frame synchronization duration T and the sum, and uses the calculated difference as the display duration T2. ​​The dimming controller sends the local backlight data, the delay duration T1, the display duration T2, and the black insertion duration T3 to the local dimmer.

[0105] For another example, the display-related duration includes the display duration T2 and the black insertion duration T3, then the target duration is the delay duration T1, the dimming controller calculates the sum of the display duration T2 and the black insertion duration T3, and then calculates the difference between the frame synchronization duration T and the sum, and uses the calculated difference as the delay duration T1, and the dimming controller sends the local backlight data, delay duration T1, display duration T2 and black insertion duration T3 to the local dimmer.

[0106] After the local dimmer receives the local backlight data, delay time, display time and black insertion time, the method of controlling the light-emitting device to emit light and controlling the light-emitting device to stop emitting light is the same as the above method, which will not be repeated here.

[0107] It should be noted that, in the embodiment of the present application, data can be transmitted between the local dimmers connected in series through a single-line transmission protocol, and the local backlight data sent by the dimming controller is the local backlight data corresponding to each local dimmer. Since for each local dimmer, at the same refresh rate, the display duration T2 and the black insertion duration T3 are equal, the dimming controller can only send one display duration T2 and one black insertion duration T3; since the positions of the local dimmers are different, the corresponding delay durations T1 are different, the dimming controller can calculate the delay duration T1 corresponding to each local dimmer, and then send the local backlight data, a display duration T2, a black insertion duration T3, and the delay duration T1 corresponding to each local dimmer to the local dimmer;

[0108] The dimming controller can also only send local backlight data, a display duration T2, a black insertion duration T3 and a delay duration T1. Normally, the delay duration T1 can be the delay duration corresponding to the local dimmer directly connected to the dimming controller. Since the position of each local dimmer is fixed, a delay deviation duration can be stored in each local dimmer. After the local dimmer receives the local backlight data, delay duration T1, display duration T2 and black insertion duration T3 sent by the local dimmer connected to it, the local dimmer adds the received delay duration T1 and the delay deviation duration stored in itself, and uses the sum as the delay duration corresponding to itself.

[0109] In another embodiment, when the display-related duration includes any two of the delay duration, the display duration and the black insertion duration, the dimming controller sends the local backlight data and the display-related duration to the local dimmer while sending the frame synchronization duration. After the local dimmer receives the local backlight data, the display-related duration and the frame synchronization duration, it calculates the difference between the frame synchronization duration and the display-related duration, and uses the difference as the target duration, wherein the target duration is any one of the delay duration, the display duration and the black insertion duration.

[0110] For example, the display-related duration includes the delay duration T1 and the display duration T2, and the target duration is the black insertion duration T3. The dimming controller sends the frame synchronization duration T, the delay duration T1 and the display duration T2 to the local dimmer. The local dimmer calculates the sum of the delay duration T1 and the display duration T2, and then calculates the difference between the frame synchronization duration T and the sum, and uses the calculated difference as the black insertion duration T3.

[0111] For another example, the display-related duration includes the delay duration T1 and the black insertion duration T3, and the target duration is the display duration T2. ​​The dimming controller sends the frame synchronization duration T, the delay duration T1 and the black insertion duration T3 to the local dimmer. The local dimmer calculates the sum of the delay duration T1 and the black insertion duration T3, and then calculates the difference between the frame synchronization duration T and the sum, and uses the calculated difference as the display duration T2.

[0112] For another example, the display-related duration includes the display duration T2 and the black insertion duration T3, then the target duration is the delay duration T1, the dimming controller sends the frame synchronization duration T, the display duration T2 and the black insertion duration T3 to the local dimmer, the local dimmer calculates the sum of the display duration T2 and the black insertion duration T3, and then calculates the difference between the frame synchronization duration T and the sum, and uses the calculated difference as the delay duration T1.

[0113] In an embodiment of the present application, for each local dimmer, after the local dimmer calculates the delay duration T1, it can calculate the delay duration corresponding to itself based on the delay deviation duration stored in itself, that is, use the sum of the calculated delay duration T1 and the delay deviation duration as the delay duration corresponding to itself.

[0114] In practice, the brightness perceived by the human eye is the average brightness value Lv over a period of time. ave , that is, the luminous brightness Lv in a period of time multiplied by the luminous duration, and then divided by the total luminous duration. When the backlight is displayed, if black insertion is not required, the luminous duration is equal to the total luminous duration, which is equal to one frame duration T'. If black insertion is required, the luminous duration is the display duration T2. ​​The sum of the display duration T2 and the black insertion duration T3 is one frame duration T', which is the total luminous duration. Therefore, the average brightness value Lv when there is no black insertion ave1 And the average brightness value Lv when black insertion existsave2 It can be expressed by the following two formulas:

[0115] Lv ave1 =Lv Formula 1

[0116] Lv ave2 =Lv*T2 / (T2+T3) Formula 2

[0117] It can be seen from formula 1 and formula 2 that Lv ave1 >Lv ave2 , that is, the brightness without black insertion is greater than the brightness with black insertion. Therefore, the brightness of the backlight is different when there is black insertion and when there is no black insertion. In order to improve the display effect, in the embodiment of the present application, it is necessary to compensate for the brightness, that is, to compensate for the local backlight data, which is described in detail below.

[0118] In one embodiment, the dimming controller determines the refresh rate based on the frame synchronization signal in the local dimming signal, searches for the brightness compensation coefficient α corresponding to the refresh rate from a preset second correspondence, takes the product of the brightness compensation coefficient α and the local backlight data data as the target local backlight data, and sends the target local backlight data and the display-related duration to the local dimmer.

[0119] The second corresponding relationship in the embodiment of the present application can be presented in the form of a table, as shown in the following Table 2:

[0120] Refresh rate Brightness compensation coefficient A α1 B α2 C α3 D α4 E α5 F α6

[0121] Table 2

[0122] In a specific implementation, the first corresponding relationship and the second corresponding relationship may be one corresponding relationship, and specifically, may also be presented in the form of a table, as shown in the following Table 3:

[0123] Refresh rate Show relevant duration Brightness compensation coefficient A a α1 B b α2 C c α3 D d α4 E e α5 F f α6

[0124] Table 3

[0125] In implementation, after the dimming controller determines the refresh rate according to the frame synchronization signal, it searches Table 3 for the display-related duration and brightness compensation coefficient corresponding to the refresh rate according to the refresh rate.

[0126] After the dimming controller finds the display-related duration and brightness compensation coefficient, it uses the product of the found brightness compensation coefficient and the local backlight data as the target local backlight data. Since the local backlight data sent by the dimming controller to the dimmer include multiple, the calculated target local backlight data also include multiple.

[0127] After receiving the target local backlight data, the local dimmer controls the brightness of the light emitting device based on the target local backlight data.

[0128] In an embodiment of the present application, the dimming controller searches for the brightness compensation coefficient corresponding to the refresh rate from the corresponding relationship, and then takes the product of the brightness compensation coefficient and the local backlight data as the target local backlight data. The brightness compensation coefficient in the corresponding relationship can be a brightness compensation coefficient actually tested or a brightness compensation coefficient obtained by theoretical calculation.

[0129] In another embodiment, the brightness compensation coefficient is calculated based on the display duration and the black insertion duration. Specifically, after the dimming controller searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, it calculates the brightness compensation coefficient α based on the display duration T2 and the black insertion duration T3 included in the display-related duration, or the display duration T2 and the black insertion duration T3 calculated based on the display-related duration, and takes the product of the brightness compensation coefficient α and the local backlight data data as the target local backlight data, and sends the target local backlight data and the display-related duration to the local dimmer.

[0130] From the above formula 1 and formula 2, we can see that Lv ave2 *(T2+T3) / T2=Lv ave1 Therefore, when the brightness compensation coefficient α=(T2+T3) / T2, the display brightness is equal to the display brightness without black insertion.

[0131] Specifically, the dimming controller calculates the brightness compensation coefficient α according to the display duration T2 and the black insertion duration T3, that is, calculates the sum of the display duration T2 and the black insertion duration T3, and uses the ratio of the sum to the display duration T2 as the brightness compensation coefficient α.

[0132] In an embodiment of the present application, after the dimming controller calculates the brightness compensation coefficient, it calculates the product of the brightness compensation coefficient and the local backlight data, uses the product as the target local backlight data, and sends the target local backlight data to the local dimmer. Since the local dimmer does not need to calculate the target local backlight data, the calculation amount of the local dimmer can be reduced.

[0133] In another embodiment, after the dimming controller searches for the display-related duration corresponding to the refresh rate from a preset first corresponding relationship, the dimming controller sends the local backlight data and the display-related duration to the local dimmer, and the local dimmer calculates the brightness compensation coefficient α according to the display duration T2 and the black insertion duration T3, and then uses the product of the brightness compensation coefficient α and the local backlight data data as the target local backlight data, and based on the target local backlight data, the delay duration, the display duration and the black insertion duration, controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light.

[0134] In an embodiment of the present application, the local dimmer calculates a brightness compensation coefficient based on the display time and the black insertion time. After the local dimmer calculates the brightness compensation coefficient, the product of the brightness compensation coefficient and the local backlight data corresponding to the local dimmer is used as the target local backlight data corresponding to the local dimmer.

[0135] In a specific implementation, the dimming controller may also send a brightness compensation coefficient to the local dimmer. After receiving the brightness compensation coefficient, the local dimmer calculates the product of the brightness compensation coefficient and the local backlight data and uses the product as the target local backlight data.

[0136] Since there are differences in display time and black insertion time at different refresh rates, there will be flickering when the frequency is switched. Therefore, the product of the brightness compensation coefficient and the local backlight data is used as the target local backlight data. The local dimmer controls the brightness of the light-emitting device based on the target local backlight data. In addition to solving the brightness reduction caused by the reduction in display time, it can also reduce the flickering phenomenon during frequency switching.

[0137] Based on the same inventive concept, an embodiment of the present application also provides a dimming controller, the principle of which to solve the technical problem is similar to that of the above-mentioned black insertion display method. The implementation of the dimming controller can refer to the implementation of the black insertion display method, and the repeated parts will not be repeated.

[0138] like Figure 6 FIG. 1 is a schematic diagram of a dimming controller provided in an embodiment of the present application, and the dimming controller includes:

[0139] A receiving module 61, configured to receive a local dimming signal, wherein the local dimming signal includes a frame synchronization signal and local backlight data;

[0140] A determination module 62, configured to determine a refresh rate according to a frame synchronization signal in the local dimming signal;

[0141] A search module 63, configured to search for a display-related duration corresponding to the refresh rate from a preset first corresponding relationship;

[0142] The sending module 64 is used to send the local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, delay duration, display duration and black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

[0143] In one embodiment, the determining module is specifically used to:

[0144] identifying a rising edge or a falling edge of a frame synchronization signal in the received local dimming signal;

[0145] Determine the frame synchronization duration between two adjacent rising edges identified, or determine the frame synchronization duration between two adjacent falling edges identified;

[0146] The refresh rate is determined according to the frame synchronization duration.

[0147] In one embodiment, the display-related duration includes any two of the delay duration, the display duration, and the black insertion duration;

[0148] Before sending the local backlight data and the display-related duration to the local dimmer, the determining module is further used to:

[0149] Calculate a target duration according to the frame synchronization duration and the display-related duration, wherein the target duration is any one of the delay duration, the display duration, and the black insertion duration;

[0150] The sending module is also used for:

[0151] The target duration is sent to the local dimmer, and the local dimmer controls a light emitting device electrically connected to the local dimmer to emit light and controls the light emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration.

[0152] In one embodiment, the display-related duration includes any two of the delay duration, the display duration, and the black insertion duration;

[0153] The determination module is used to send the frame synchronization duration to the local dimmer. After the local dimmer calculates the target duration according to the frame synchronization duration and the display-related duration, the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration, wherein the target duration is any one of the delay duration, the display duration and the black insertion duration.

[0154] In one embodiment, after determining the refresh rate according to the frame synchronization signal in the local dimming signal, the search module is further configured to:

[0155] Searching for a brightness compensation coefficient corresponding to the refresh rate from a preset second corresponding relationship; taking the product of the brightness compensation coefficient and the local backlight data as target local backlight data;

[0156] The sending module is also used for:

[0157] The target local backlight data and the display-related duration are sent to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration.

[0158] In one embodiment, after searching the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the determination module is further configured to:

[0159] Calculating a brightness compensation coefficient according to the delay duration and the display duration; taking the product of the brightness compensation coefficient and the local backlight data as target local backlight data;

[0160] The sending module is further used to: send the target local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration; or

[0161] After searching the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the sending module is further used to:

[0162] The local backlight data and the display-related duration are sent to a local dimmer. The local dimmer calculates the brightness compensation coefficient according to the delay duration and the display duration, and uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data. Based on the target local backlight data, the delay duration, the display duration and the black insertion duration, the light-emitting device electrically connected to the local dimmer is controlled to emit light and the light-emitting device is controlled to stop emitting light.

[0163] Based on the same inventive concept, the embodiment of the present application also provides a backlight system. The principle of solving the technical problem by the backlight system is similar to that of the above-mentioned black insertion display method. The implementation of the backlight system can refer to the implementation of the black insertion display method, and the repeated parts will not be repeated.

[0164] An embodiment of the present application provides a backlight system, including a local dimmer, a light emitting device, and a dimming controller as described above;

[0165] The dimming controller, the local dimmer and the light emitting device are connected in sequence.

[0166] The black insertion display method, dimming controller and backlight system provided by the embodiment of the present application, after receiving the local dimming signal, the dimming controller determines the refresh rate according to the frame synchronization signal in the local dimming signal, and then searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, and finally sends the display-related duration and the local backlight data included in the local dimming signal to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the delay duration, the display duration and the black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration. Since the dimming controller first determines the refresh rate according to the frame synchronization signal, and then searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, and the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration, black insertion in VRR mode can be achieved, thereby improving the flexibility of the black frame insertion technology.

[0167] The present application is described above with reference to the block diagrams and / or flow charts showing the methods, devices (systems) and / or computer program products according to the embodiments of the present application. It should be understood that a block of the block diagram and / or flow chart diagram and a combination of blocks of the block diagram and / or flow chart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer and / or other programmable data processing device to produce a machine, so that the instructions executed by the computer processor and / or other programmable data processing device create a method for implementing the functions / actions specified in the block diagram and / or flow chart block.

[0168] Accordingly, the present application may also be implemented with hardware and / or software (including firmware, resident software, microcode, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium, which has a computer-usable or computer-readable program code implemented in the medium, for use by an instruction execution system or in conjunction with an instruction execution system. In the context of the present application, a computer-usable or computer-readable medium may be any medium that may contain, store, communicate, transmit, or convey a program for use by an instruction execution system, device, or apparatus, or in conjunction with an instruction execution system, device, or apparatus.

[0169] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A black insertion display method, characterized in that: include: The dimming controller receives a local dimming signal, wherein the local dimming signal includes a frame synchronization signal and local backlight data; The dimming controller determines a refresh rate according to a frame synchronization signal in the local dimming signal; The dimming controller searches for a display-related duration corresponding to the refresh rate from a preset first corresponding relationship; The dimming controller sends the local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, delay duration, display duration and black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

2. The method according to claim 1, characterized in that The dimming controller determines a refresh rate according to a frame synchronization signal in the local dimming signal, including: The dimming controller identifies a rising edge or a falling edge of a frame synchronization signal in the received local dimming signal; The dimming controller determines a frame synchronization duration between two adjacent rising edges identified, or determines a frame synchronization duration between two adjacent falling edges identified; The dimming controller determines the refresh rate according to the frame synchronization duration.

3. The method according to claim 2, characterized in that The display-related duration includes any two of the delay duration, the display duration, and the black insertion duration; Before the dimming controller sends the local backlight data and the display-related duration to the local dimmer, the method further includes: The dimming controller calculates a target duration according to the frame synchronization duration and the display-related duration, wherein the target duration is any one of the delay duration, the display duration, and the black insertion duration; The method further comprises: The dimming controller sends the target duration to the local dimmer, and the local dimmer controls the light emitting device electrically connected to the local dimmer to emit light and controls the light emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration.

4. The method according to claim 2, characterized in that: The display-related duration includes any two of the delay duration, the display duration, and the black insertion duration, and the method further includes: The dimming controller sends the frame synchronization duration to the local dimmer, and the local dimmer calculates the target duration according to the frame synchronization duration and the display-related duration, and then controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration, wherein the target duration is any one of the delay duration, the display duration and the black insertion duration.

5. The method according to any one of claims 1 to 4, characterized in that: After the dimming controller determines the refresh rate according to the frame synchronization signal in the local dimming signal, the dimming controller further includes: The dimming controller searches for a brightness compensation coefficient corresponding to the refresh rate from a preset second corresponding relationship; The dimming controller uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data; The dimming controller sends the target local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration.

6. The method according to any one of claims 1 to 4, characterized in that: After the dimming controller searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the method further includes: The dimming controller calculates a brightness compensation coefficient according to the display duration and the black insertion duration; The dimming controller uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data; The dimming controller sends the target local backlight data and the display-related duration to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration; or After the dimming controller searches for the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the method further includes: The dimming controller sends the local backlight data and the display-related duration to the local dimmer. The local dimmer calculates the brightness compensation coefficient based on the display duration and the black insertion duration, and uses the product of the brightness compensation coefficient and the local backlight data as the target local backlight data. Based on the target local backlight data, the delay duration, the display duration and the black insertion duration, the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light.

7. A dimming controller, characterized in that: include: A receiving module, configured to receive a local dimming signal, wherein the local dimming signal includes a frame synchronization signal and local backlight data; A determination module, configured to determine a refresh rate according to a frame synchronization signal in the local dimming signal; A search module, used to search for a display-related duration corresponding to the refresh rate from a preset first corresponding relationship; A sending module is used to send the local backlight data and the display-related duration to a local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light based on the local backlight data, delay duration, display duration and black insertion duration, wherein the display-related duration includes at least two of the delay duration, the display duration and the black insertion duration.

8. The dimming controller according to claim 7, characterized in that: The determination module is specifically used for: identifying a rising edge or a falling edge of a frame synchronization signal in the received local dimming signal; Determine the frame synchronization duration between two adjacent rising edges identified, or determine the frame synchronization duration between two adjacent falling edges identified; The refresh rate is determined according to the frame synchronization duration.

9. The dimming controller according to claim 8, characterized in that: The display-related duration includes any two of the delay duration, the display duration, and the black insertion duration; Before sending the local backlight data and the display-related duration to the local dimmer, the determining module is further used to: Calculate a target duration according to the frame synchronization duration and the display-related duration, wherein the target duration is any one of the delay duration, the display duration, and the black insertion duration; The sending module is also used for: The target duration is sent to the local dimmer, and the local dimmer controls a light emitting device electrically connected to the local dimmer to emit light and controls the light emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration.

10. The dimming controller according to claim 8, characterized in that: The display-related duration includes any two of the delay duration, the display duration, and the black insertion duration; The determination module is used to send the frame synchronization duration to the local dimmer. After the local dimmer calculates the target duration according to the frame synchronization duration and the display-related duration, the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the local backlight data, the display-related duration and the target duration, wherein the target duration is any one of the delay duration, the display duration and the black insertion duration.

11. The dimming controller according to any one of claims 7 to 10, characterized in that: After determining the refresh rate according to the frame synchronization signal in the local dimming signal, the search module is further used to: Searching for a brightness compensation coefficient corresponding to the refresh rate from a preset second corresponding relationship; taking the product of the brightness compensation coefficient and the local backlight data as target local backlight data; The sending module is also used for: The target local backlight data and the display-related duration are sent to the local dimmer, and the local dimmer controls the light-emitting device electrically connected to the local dimmer to emit light and controls the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration.

12. The dimming controller according to any one of claims 7 to 10, characterized in that: After searching the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the determination module is further used to: Calculating a brightness compensation coefficient according to the display duration and the black insertion duration; taking the product of the brightness compensation coefficient and the local backlight data as target local backlight data; The sending module is also used for: Sending the target local backlight data and the display-related duration to the local dimmer, the local dimmer controlling a light-emitting device electrically connected to the local dimmer to emit light and controlling the light-emitting device to stop emitting light based on the target local backlight data, the delay duration, the display duration and the black insertion duration; or After searching the display-related duration corresponding to the refresh rate from the preset first corresponding relationship, the sending module is further used to: The local backlight data and the display-related duration are sent to a local dimmer. The local dimmer calculates the brightness compensation coefficient according to the display duration and the black insertion duration, and uses the product of the brightness compensation coefficient and the local backlight data as target local backlight data. Based on the target local backlight data, the delay duration, the display duration and the black insertion duration, the light-emitting device electrically connected to the local dimmer is controlled to emit light and the light-emitting device is controlled to stop emitting light.

13. A backlight system, characterized in that: It comprises a local dimmer, a light emitting device and a dimming controller as claimed in any one of claims 7 to 12; The dimming controller, the local dimmer and the light emitting device are connected in sequence.

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