Dimming data transmission method, display chip and backlight module

Abstract

The invention discloses a dimming data transmission method, a display chip and a backlight module, and the method comprises the steps: determining dimming change data based on the dimming data corresponding to a to-be-displayed image frame and the dimming data corresponding to a previous image frame; comparing the dimming change data with the dimming change threshold, determining a target area in the to-be-displayed image frame according to a comparison result, and generating target dimming data according to the dimming data corresponding to the target area; and sending the target dimming data to the target dimmer. By setting the dimming change threshold, motion estimation is performed on the to-be-displayed image frame, and the target dimming data is generated according to the dimming data corresponding to the moving target area, so that the transmission quantity and the processing quantity of the data can be effectively reduced, the electromagnetic wave interference problem of the display equipment can be effectively alleviated, the backlight flicker problem can be improved, and the user experience can be improved. Meanwhile, the overall power consumption of the display equipment can be reduced, and the display performance of the display equipment is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a dimming data transmission method, a display chip and a backlight module. Background Art

[0002] In recent years, with the rapid development of image display technology, in order to provide users with a better visual experience, display devices are gradually developing in the direction of large-scale and high-performance. In current display devices, in order to effectively improve the display effect and color contrast of images, a large number of backlight sources are usually set in the backlight unit (BLU), and a large number of dimmers (Dimmers) for controlling the backlight sources and dimming controllers (Dimmer Controllers) for controlling the dimmers are set accordingly.

[0003] However, in actual applications, as the number of backlight sources, dimmers, and dimming controllers increases, the number of backlight partitions will increase accordingly in the process of backlight control using local dimming technology, and the amount of transmission of related instructions and data for backlight control will also increase accordingly. This will not only cause the overall electromagnetic interference (EMI) of the display device to increase, but also increase the overall power consumption of the device. The increase in backlight partitions will also make the display device more sensitive to changes in local dimming data, resulting in backlight flickering (Flicker) during image display, resulting in tail problems in the displayed image, which seriously affects the performance of the display device. Summary of the invention

[0004] The present invention provides a dimming data transmission method, a display chip and a backlight module, which are used to solve the problems of increased EMI, increased power consumption, backlight flickering, etc. in existing display devices caused by increased chip data on the backlight panel, as well as increased transmission data volume and instructions.

[0005] In a first aspect, an embodiment of the present invention provides a method for transmitting dimming data, including: Determine dimming change data based on dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed; Comparing the dimming change data with a dimming change threshold, determining a target area in the image frame to be displayed according to the comparison result, and generating target dimming data according to the dimming data corresponding to the target area; The target dimming data is sent to a target dimmer, wherein the target dimmer is at least one dimmer corresponding to the target area.

[0006] In the dimming data transmission method provided in an embodiment of the present invention, the dimming data of the image frame to be displayed is compared with the dimming data of the previous image frame to determine the dimming change data, and the dimming change data and the dimming change threshold are compared to perform motion estimation; then, the target area where the motion occurs in the image frame to be displayed is determined according to the comparison result, and target dimming data is generated according to the dimming data corresponding to the target area, and the target dimming data is sent to the corresponding dimmer, i.e., the target dimmer, so that the target dimmer performs backlight control according to the target dimming data received by itself, while the remaining dimmers perform backlight control according to the dimming data stored by themselves. By setting a dimming change threshold, motion estimation is performed on the image frame to be displayed, and when motion is determined to occur, target dimming data is generated only based on the dimming data corresponding to the target area where motion occurs. The amount of target dimming data determined in this way is significantly smaller than the amount of all dimming data corresponding to the image frame to be displayed. When the target dimming data is sent to the corresponding part of the dimmers for backlight control, not only the amount of transmitted data can be reduced, but also the amount of data processing can be reduced, thereby effectively alleviating the electromagnetic interference problem of the display device and improving the backlight flicker problem. At the same time, the overall power consumption of the display device can be reduced, and the display performance of the display device can be improved.

[0007] In an optional embodiment, determining the dimming change data based on the dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed includes: Determine a data change amount between first dimming data and second dimming data, wherein the first dimming data is dimming data corresponding to the image frame to be displayed, and the second dimming data is dimming data corresponding to the previous image frame; The dimming change data is generated according to the determined data change amount.

[0008] In an optional embodiment, the first dimming data includes a plurality of first dimming sub-data, and the second dimming data includes a plurality of second dimming sub-data; The determining of the data change amount between the first dimming data and the second dimming data includes: For any one of the plurality of first dimming sub-data, a difference between the first dimming sub-data and second dimming sub-data corresponding to the first dimming sub-data is determined, and an absolute value of the difference is used as a data variation corresponding to the first dimming sub-data.

[0009] In the above method, since the display device is provided with a plurality of light-emitting units, the dimming data corresponding to different image frames may include dimming sub-data corresponding to each light-emitting unit. In the process of determining the dimming change data, the embodiment of the present invention may determine a plurality of data change amounts by calculating the difference in the dimming sub-data corresponding to the same light-emitting unit in two adjacent image frames, and compose the determined plurality of data change amounts into dimming change data. The dimming change data determined in the above manner may accurately reflect the change of the dimming data corresponding to each light-emitting unit, and provide strong data support for subsequent motion estimation.

[0010] In an optional embodiment, the dimming change data includes a plurality of dimming change sub-data; Determining the target area in the image frame to be displayed according to the comparison result includes: When it is determined that there is the dimming change sub-data which is greater than or equal to the dimming change threshold, taking the dimming change sub-data which is greater than or equal to the dimming change threshold as the target dimming change sub-data; An image region in the image frame to be displayed corresponding to the target dimming change sub-data is used as the target region.

[0011] In the above method, since the dimming change data includes multiple dimming change sub-data, one dimming change sub-data is used to characterize the change of dimming data of a light-emitting unit between two adjacent image frames. Therefore, by comparing the size relationship between each dimming change sub-data and the dimming change threshold, one or more target dimming change sub-data can be determined; and since the determined target dimming change sub-data is greater than or equal to the dimming change threshold, it means that the dimming data corresponding to these target dimming change sub-data have a large change between two adjacent image frames, and it can be determined that movement has occurred. In this way, the target area determined in the image frame to be displayed by the target dimming change sub-data is the area where movement has occurred, thereby achieving effective and accurate motion estimation.

[0012] In an optional embodiment, generating target dimming data according to the dimming data corresponding to the target area includes: generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data; The first dimming data is the dimming data corresponding to the image frame to be displayed, and the first dimming data includes a plurality of the first dimming sub-data.

[0013] In the above method, after determining the target area, the target dimming data is generated according to the first dimming sub-data corresponding to the target area. Since the target area is a partial image area in the image frame to be displayed, the data volume of the first dimming sub-data corresponding to the target area is smaller than the data volume of the first dimming data corresponding to the image frame to be displayed, so that the data volume of the determined target dimming data is also smaller than the data volume of the first dimming data. In this way, in the subsequent transmission of the target dimming data, compared with the method in the related art that transmits the dimming data corresponding to the entire image frame, in the embodiment of the present invention, only the dimming data corresponding to the area where the movement occurs, that is, the target area, needs to be transmitted, so the data transmission amount and the processing amount can be effectively reduced.

[0014] In an optional embodiment, generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data includes: Determine a plurality of target dimming sub-data respectively according to a plurality of first dimming sub-data corresponding to the target area, wherein the dimmers corresponding to the plurality of first dimming sub-data are connected in series; The target dimming data is constructed based on the control instruction and the plurality of target dimming sub-data.

[0015] In an optional embodiment, sending the target dimming data to a target dimmer includes: The target dimming data is transmitted to a plurality of target dimmers in sequence along a preset direction, wherein the plurality of target dimmers are connected in series.

[0016] The above method can use the multiple first dimming sub-data corresponding to the multiple target dimmers connected in series among all the first dimming sub-data corresponding to the target area as multiple target dimming sub-data, thereby realizing the generation of target dimming data. In this way, during the transmission of the target dimming data, the target dimming data can be sequentially transmitted to the multiple target dimmers connected in series through the signal line to update the dimming data stored in these target dimmers, and the transmission method is simple and easy to implement.

[0017] In an optional embodiment, generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data includes: For any one of the plurality of first dimming sub-data corresponding to the target area, the first dimming sub-data is used as target dimming sub-data, and the target dimming data is constructed based on the control instruction and the target dimming sub-data.

[0018] In an optional embodiment, sending the target dimming data to a target dimmer includes: According to the address information carried in the target dimming data, a plurality of the target dimming data are respectively and simultaneously transmitted to a plurality of target dimmers.

[0019] The above method can use any first dimming sub-data corresponding to the target area as the target dimming sub-data to generate the target dimming data using the target dimming sub-data. Multiple target dimming data can be determined by the above method, and each target dimming data corresponds to a light-emitting unit. In this way, during the transmission of the target dimming data, the multiple target dimming data can be simultaneously transmitted to multiple target dimmers to update the dimming data stored in these target dimmers. The transmission method is flexible and the transmission efficiency is high.

[0020] In an optional embodiment, after comparing the dimming change data with the dimming change threshold, the method further includes: When it is determined that the dimming change data is less than the dimming change threshold, the dimming data corresponding to the image frame to be displayed is not sent to the multiple dimmers, so that the multiple dimmers perform backlight control according to the dimming data stored in themselves.

[0021] In the above method, when it is determined that the dimming change data is less than the dimming change threshold, that is, each dimming change sub-data included in the dimming change data is less than the dimming change threshold, it means that the change in the dimming data between two adjacent image frames is very small, and its change in the backlight brightness is also very small, then it can be determined that no movement has occurred. At this time, the embodiment of the present invention will not send the dimming data corresponding to the image frame to be displayed to each dimmer, that is, there will be no data transmission, and each dimmer will control the backlight according to the dimming data stored in itself, which can effectively reduce the amount of data transmission, avoid waste of resources caused by unnecessary data transmission, and effectively improve the performance of the display device.

[0022] In an optional embodiment, the transmission time of the target dimming data is no earlier than the start time of the display period of the image frame to be displayed, and no later than the end time of the display period of the image frame to be displayed.

[0023] The above method can transmit the target dimming data at any time within the display period of the image frame to be displayed, and the transmission time is flexible.

[0024] In an optional embodiment, the method further includes: According to the display-related attribute information, the dimming change threshold corresponding to the previous image frame is adjusted to obtain the dimming change threshold corresponding to the image frame to be displayed; Among them, the adjusted dimming change threshold is greater than or equal to the preset dimming change lower limit threshold, and less than or equal to the preset dimming change upper limit threshold, and the display-related attribute information includes at least one of the characteristic information of the backlight unit and the characteristic information of the image frame to be displayed.

[0025] The above method can also adaptively adjust the dimming change threshold according to the display-related attribute information, wherein by increasing the dimming change threshold, the sensitivity of the dimming data change can be reduced, effectively improving the backlight flicker problem; by decreasing the dimming change threshold, the sensitivity of the dimming data change can be increased, bringing a more accurate motion estimation effect, and improving the accuracy of the motion image display. Therefore, in the embodiment of the present invention, by setting the dimming change threshold to be adjustable and adaptively adjusting it, the accuracy of the motion image display and the reduction of the backlight flicker can be balanced, bringing a better display effect to the display device.

[0026] In a second aspect, an embodiment of the present invention provides a display chip, including: A data processing module, configured to determine dimming change data based on dimming data corresponding to the image frame to be displayed and the image frame preceding the image frame to be displayed; A data generating module, configured to compare the dimming change data with a dimming change threshold, determine a target area in the image frame to be displayed according to the comparison result, and generate target dimming data according to the dimming data corresponding to the target area; A data sending module is used to send the target dimming data to a target dimmer, wherein the target dimmer is at least one dimmer corresponding to the target area.

[0027] In an optional embodiment, the data processing module is specifically used for: Determine a data change amount between first dimming data and second dimming data, wherein the first dimming data is dimming data corresponding to the image frame to be displayed, and the second dimming data is dimming data corresponding to the previous image frame; The dimming change data is generated according to the determined data change amount.

[0028] In an optional embodiment, the first dimming data includes a plurality of first dimming sub-data, and the second dimming data includes a plurality of second dimming sub-data; The data processing module is specifically used for: For any one of the plurality of first dimming sub-data, a difference between the first dimming sub-data and second dimming sub-data corresponding to the first dimming sub-data is determined, and an absolute value of the difference is used as a data variation corresponding to the first dimming sub-data.

[0029] In an optional embodiment, the dimming change data includes a plurality of dimming change sub-data; The data generation module is specifically used for: When it is determined that there is the dimming change sub-data which is greater than or equal to the dimming change threshold, taking the dimming change sub-data which is greater than or equal to the dimming change threshold as the target dimming change sub-data; An image region in the image frame to be displayed corresponding to the target dimming change sub-data is used as the target region.

[0030] In an optional embodiment, the data generation module is specifically used to: generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data; The first dimming data is the dimming data corresponding to the image frame to be displayed, and the first dimming data includes a plurality of the first dimming sub-data.

[0031] In an optional embodiment, the data generation module is specifically used to: Determine a plurality of target dimming sub-data respectively according to a plurality of first dimming sub-data corresponding to the target area, wherein the dimmers corresponding to the plurality of first dimming sub-data are connected in series; The target dimming data is constructed based on the control instruction and the plurality of target dimming sub-data.

[0032] In an optional embodiment, the data sending module is specifically used for: The target dimming data is transmitted to a plurality of target dimmers in sequence along a preset direction, wherein the plurality of target dimmers are connected in series.

[0033] In an optional embodiment, the data generation module is specifically used to: For any one of the plurality of first dimming sub-data corresponding to the target area, the first dimming sub-data is used as target dimming sub-data, and the target dimming data is constructed based on the control instruction and the target dimming sub-data.

[0034] In an optional embodiment, the data sending module is specifically used for: According to the address information carried in the target dimming data, a plurality of the target dimming data are respectively and simultaneously transmitted to a plurality of target dimmers.

[0035] In an optional embodiment, the data generation module is further used for: When it is determined that the dimming change data is less than the dimming change threshold, the dimming data corresponding to the image frame to be displayed is not sent to the multiple dimmers, so that the multiple dimmers perform backlight control according to the dimming data stored in themselves.

[0036] In an optional embodiment, the transmission time of the target dimming data is no earlier than the start time of the display period of the image frame to be displayed, and no later than the end time of the display period of the image frame to be displayed.

[0037] In an optional embodiment, the display chip further includes a threshold adjustment module; The threshold adjustment module is used for: According to the display-related attribute information, the dimming change threshold corresponding to the previous image frame is adjusted to obtain the dimming change threshold corresponding to the image frame to be displayed; Among them, the adjusted dimming change threshold is greater than or equal to the preset dimming change lower limit threshold, and less than or equal to the preset dimming change upper limit threshold, and the display-related attribute information includes at least one of the characteristic information of the backlight unit and the characteristic information of the image frame to be displayed.

[0038] In a third aspect, an embodiment of the present invention provides a backlight module, comprising a plurality of dimmers, a plurality of light-emitting units, and a display chip as described in any one of the embodiments of the second aspect above, wherein: The display chip is electrically connected to the plurality of dimmers respectively, and one dimmer is electrically connected to at least one light-emitting unit; The dimmer is used to generate a dimming control signal according to the target dimming data received by itself or the dimming data stored by itself, and use the dimming control signal to perform backlight control on the light-emitting unit electrically connected to itself.

[0039] For the technical effects that may be achieved by the display chip disclosed in the second aspect and the backlight module disclosed in the third aspect, please refer to the technical effects that may be achieved by the first aspect or various possible solutions in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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.

[0041] Figure 1 A schematic diagram of the structure of a backlight panel of a low-performance display device provided in the related art; Figure 2A schematic diagram of the structure of a backlight panel of a large-scale display device provided in the related art; Figure 3 A schematic diagram of the structure of a backlight panel of another large-scale display device provided in the related art; Figure 4A A schematic diagram of brightness change of a backlight panel provided for related technology; Figure 4B A schematic diagram of data transmission on a backlight panel provided for related technology; Figure 5A Another schematic diagram of brightness variation of a backlight panel provided in the related art; Figure 5B Another schematic diagram of data transmission on a backlight panel provided for related technology; Fig. 6A Another schematic diagram of brightness variation of a backlight panel provided in the related art; Figure 6B Another schematic diagram of data transmission on a backlight panel provided for related technology; Figure 7 A schematic diagram of backlight partition lighting provided for related technology; Figure 8 A schematic diagram of an application scenario of a dimming data transmission method provided by an embodiment of the present invention; Fig. 9 A schematic diagram of a working process of a dimming data transmission method provided by an embodiment of the present invention; Fig.10 A schematic diagram of the structure of a backlight architecture provided by an embodiment of the present invention; Fig.11 A schematic diagram of a method for determining dimming change data provided by an embodiment of the present invention; Fig. 12A A schematic diagram of a transmission method of dimming data provided by an embodiment of the present invention; Fig. 12B A schematic diagram of another dimming data transmission method provided by an embodiment of the present invention; Fig. 12C A schematic diagram of another dimming data transmission method provided by an embodiment of the present invention; Fig.13 A schematic diagram of the corresponding relationship between a backlight architecture and dimming data transmission provided by an embodiment of the present invention; Fig.14A A schematic diagram of a working timing of target dimming data transmission provided by an embodiment of the present invention; Fig. 14B A schematic diagram of another working timing of target dimming data transmission provided by an embodiment of the present invention; Fig. 14CA schematic diagram of another working timing of target dimming data transmission provided by an embodiment of the present invention; Fig.14D A schematic diagram of another working timing of target dimming data transmission provided by an embodiment of the present invention; Fig.14E A schematic diagram of another working timing of target dimming data transmission provided by an embodiment of the present invention; Fig.15 A schematic diagram of a complete workflow of a dimming data transmission method provided by an embodiment of the present invention; Fig.16 A schematic diagram of a module structure of a display chip provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0044] With the rapid development of image display technology, in order to provide users with a better visual experience, display devices are gradually moving towards large-scale and high-performance. However, while the large-scale and high-performance display devices improve the image display effect, they also bring some performance problems, which are described in detail below: Figure 1 FIG. 1 shows a schematic diagram of the structure of a backlight panel of a low-performance display device provided by a related art. Figure 1 As shown, on the backlight panel 100 of the low-performance display device, a plurality of dimmers 120 and a plurality of light-emitting units 130 are provided, wherein: The dimming controller 110 is electrically connected to a plurality of dimmers 120; the plurality of dimmers 120 are arranged in an array, and the plurality of dimmers 120 in the same column are connected in series through a signal line 140. The first dimmer in each column of dimmers 120, that is, the dimmer connected to the dimming controller 110, can be defined as a first-level dimmer, and each first-level dimmer is connected in parallel; wherein one dimmer 120 is electrically connected to at least one light-emitting unit 130, for example, in Figure 1 In the structure of the backlight panel 100 shown, one dimmer 120 is connected to two light-emitting units 130. Of course, one dimmer 120 can also be connected to one, four or even other numbers of light-emitting units 130, which can be flexibly set according to actual business needs.

[0045] In a specific implementation, the dimmer 120 can control the brightness of the light-emitting unit 130 connected thereto according to the received local dimming data, thereby adjusting the backlight brightness provided by the backlight panel 100. In particular, to match the arrangement of the dimmer 120, the multiple light-emitting units 130 on the backlight panel 100 are also arranged in an array; the number of the dimmer 120 and the light-emitting unit 130 can be adaptively set according to the size of the display panel. Therefore, in a large-scale display device, in order to adapt to a large-size display panel, the size of the backlight panel 100 also needs to be increased, and the number of the dimming controller 110, the dimmer 120 and the light-emitting unit 130 arranged on the backlight panel 100 will also increase accordingly.

[0046] Figure 2 FIG. 1 shows a schematic diagram of the structure of a backlight panel of a large-scale display device. Figure 2 As shown, in a large-scale display device, in order to match a display panel with a larger size, the backlight panel 200 is usually composed of a plurality of backlight units 210 spliced ​​together, for example, Figure 2 In the backlight panel 200 shown, the backlight panel 200 may be formed by splicing four backlight units 210 , and the four backlight units are respectively: a backlight unit 210 -A, a backlight unit 210 -B, a backlight unit 210 -C and a backlight unit 210 -D.

[0047] like Figure 2 As shown, each backlight unit 210 is provided with a plurality of dimmers 220 and a plurality of light-emitting units 230, and the plurality of dimmers 220 are arranged in an array, and the plurality of dimmers 220 located in the same column are connected in series through a signal line, and one dimmer 220 is electrically connected to at least one light-emitting unit 230; in addition, a dimming controller 240 is also provided on the backlight panel 200, and the dimming controller 240 is electrically connected to the dimmer 220.

[0048] Figure 3FIG. 2 shows a schematic diagram of the structure of a backlight panel of another large-scale display device. Figure 3 As shown, the dimming controller 240 provided on the backlight panel 200 may include multiple ones. For ease of understanding, the following description is given by taking two dimming controllers 240 provided on the backlight panel 200, namely, the dimming controller 240-A and the dimming controller 240-B as an example: like Figure 3 As shown, the dimming controller 240-A can be electrically connected to the backlight unit 210-A and the backlight unit 210-C, respectively, to control the respective dimmers 220 on the backlight unit 210-A and the backlight unit 210-C; the dimming controller 240-B can be electrically connected to the backlight unit 210-B and the backlight unit 210-D, respectively, to control the respective dimmers 220 on the backlight unit 210-B and the backlight unit 210-D.

[0049] It should be understood that Figure 2 and Figure 3 The architecture of the backlight panel shown is for illustrative purposes only. In actual applications, the number of dimming controllers in the display device can be adaptively set according to the number of backlight units provided on the backlight panel. One dimming controller can control one or more backlight units, and the embodiments of the present invention do not impose any restrictions on this. In addition, the position of the dimming controller, and the connection method between the dimming controller and the backlight unit can be flexibly set, and the embodiments of the present invention do not impose any restrictions on this.

[0050] exist Figure 2 and Figure 3 In the architecture of the backlight panel shown, since the size of the backlight panel 200 is large, the number of dimming controllers 240, the number of dimmers 220 and the number of light-emitting units 230 arranged thereon are all large, and in order to meet the high performance requirements of the display device, in the process of backlight control using local dimming technology, the number of backlight partitions determined on the backlight panel 200 will also increase accordingly, and the amount of local dimming data that needs to be transmitted and the number of control instructions will increase accordingly.

[0051] Figure 4A FIG. 1 shows a schematic diagram of brightness variation of a backlight panel in a related art. Figure 4A As shown, the left side shows the backlight lighting of the backlight panel during the display period of the image frame F1; the right side shows the backlight lighting of the backlight panel during the display period of the image frame F2, and the image frame F2 is the next frame of the image frame F1. Figure 4A It can be seen that in the process of switching from the image frame F1 to the image frame F2 , the dimming data as a whole does not change, and the backlight brightness corresponding to the image frame F2 is the same or approximately the same as the backlight brightness corresponding to the image frame F1 .

[0052] Figure 4B A schematic diagram of data transmission on a backlight panel in a related art is shown. Figure 4A The schematic diagram of the backlight panel brightness change in FIG. Figure 4B As shown, the left side represents the transmission method of the dimming data corresponding to the image frame F1 during the display period of the image frame F1, wherein each dimmer 220 on the backlight panel 200 will receive the dimming data sent by the dimming controller 240 (i.e., D in the figure); the right side represents the transmission method of the dimming data corresponding to the image frame F2 during the display period of the image frame F2, wherein, although the dimming data corresponding to the image frame F2 is the same or approximately the same as the dimming data corresponding to the image frame F1, and there is no need to change the backlight brightness, in the related art, the dimming controller 240 will still send all the dimming data corresponding to the image frame F2 to each dimmer 220, thereby resulting in an increase in the amount of data transmission.

[0053] Figure 5A FIG. 2 shows another schematic diagram of brightness variation of a backlight panel in a related art. Figure 5A As shown, in the process of switching from the image frame F1 to the image frame F2, the dimming data changes as a whole, and the backlight brightness corresponding to the image frame F2 is significantly different from the backlight brightness corresponding to the image frame F1.

[0054] Figure 5B A schematic diagram of data transmission on a backlight panel in a related art is shown. Figure 5A The schematic diagram of the backlight panel brightness change in FIG. Figure 5B As shown, the left side shows the transmission mode of the dimming data corresponding to the image frame F1 during the display period of the image frame F1, wherein, during the display period of the image frame F1, each dimmer 220 on the backlight panel 200 will receive the dimming data sent by the dimming controller 240; the right side shows the transmission mode of the dimming data corresponding to the image frame F2 during the display period of the image frame F2, referring to Figure 5B As can be seen on the right side, when switching to the display period of image frame F2, the dimming data corresponding to image frame F2 has undergone a significant change as a whole compared to the dimming data corresponding to image frame F1. At this time, the dimming controller 240 will send all the dimming data corresponding to image frame F2 to each dimmer 220, so that the dimmer 220 can perform backlight control according to the received dimming data corresponding to image frame F2.

[0055] Fig. 6A FIG. 2 shows another schematic diagram of brightness variation of a backlight panel in a related art. Fig. 6AAs shown, in the process of switching from image frame F1 to image frame F2, only part of the dimming data changes, namely the area indicated by the dotted box C1 in the right backlight panel. Therefore, compared with the dimming data corresponding to image frame F1, the dimming data corresponding to image frame F2 only has a larger difference in the dimming data corresponding to the area indicated by the dotted box C1, and the dimming data corresponding to the remaining areas are the same or approximately the same.

[0056] Figure 6B A schematic diagram of data transmission on a backlight panel in a related art is shown. Fig. 6A The schematic diagram of the backlight panel brightness change in FIG. Figure 6B As shown, the left side shows the transmission mode of the dimming data corresponding to the image frame F1 during the display period of the image frame F1, wherein, during the display period of the image frame F1, each dimmer 220 on the backlight panel 200 will receive the dimming data sent by the dimming controller 240; the right side shows the transmission mode of the dimming data corresponding to the image frame F2 during the display period of the image frame F2, referring to Figure 6B As can be seen on the right side, when switching to the display period of image frame F2, although only part of the dimming data corresponding to image frame F2 has changed compared to the dimming data corresponding to image frame F1, in the related art, the dimming controller 240 will still send all the dimming data corresponding to image frame F2 to each dimmer 220, so that the dimmer 220 performs backlight control according to the received dimming data corresponding to image frame F2.

[0057] Therefore, refer to Figure 4A , Figure 4B , Figure 5A , Figure 5B , Fig. 6A and Figure 6B It can be seen that regardless of whether the dimming data corresponding to the image frame changes, within the display period of the current image frame, the dimming controller 240 needs to send the dimming data corresponding to the current image frame to each dimmer 220 to perform backlight control of the current image frame, which will result in an increase in the data transmission and data processing volume of the dimming data.

[0058] Therefore, in practical applications, large-scale display devices will have the following problems: (1) Increased electromagnetic interference: In large-scale display devices, the increase in the number of dimming controllers, dimmers, and light-emitting units on the backlight panel will increase the complexity of the circuit layout within the board, and the increase in the number of chips in working state during the image display of the display device will also lead to an increase in electromagnetic radiation sources, thereby increasing electromagnetic wave interference. In addition, the increase in backlight partitions, on the one hand, will lead to an increase in the amount of local dimming data and the number of control instructions that need to be processed; on the other hand, it will also lead to an increase in the amount of data / instructions that need to be transmitted, which will increase signal crosstalk and data processing efficiency, thereby increasing electromagnetic wave interference.

[0059] (2) Increased equipment power consumption: In the above-mentioned display devices, the increase in the number of dimming controllers, dimmers and light-emitting units, as well as the increase in the amount of local dimming data and the number of control instructions that need to be processed and transmitted will lead to an increase in the overall power consumption of the device, which is not conducive to the low-power performance optimization of the device.

[0060] (3) Backlight flickering problem occurs: The improvement in the performance of display devices has increased the number of backlight partitions and improved their precision. However, this will also increase the sensitivity of the display device to changes in local dimming data. When the local dimming data changes, the backlight will flicker, causing the image display effect to deteriorate, seriously affecting the user's visual experience.

[0061] Figure 7 A schematic diagram of backlight partition lighting is shown. Figure 7 As shown, (a) is a schematic diagram of backlight partitions corresponding to a low-performance display device, wherein the number of backlight partitions set on the backlight panel is small, and the image partition corresponding to each backlight partition is relatively large. (b) is a schematic diagram of backlight partitions corresponding to a high-performance display device, wherein the number of backlight partitions set on the backlight panel is large, and the image partition corresponding to each backlight partition is relatively small.

[0062] Since the backlight partition will follow the display drive of the image partition and light up its own backlight source in order, when the driven image area switches from a1 to a2, Figure 7 In the backlight partition structure shown in (a), since the image partition corresponding to the backlight partition is larger, the switching of the driven image area will not cause the corresponding backlight partition to change, so the backlight partition b1 in (a) is still kept lit; Figure 7 In the backlight partition structure shown in (b), since the image partition corresponding to the backlight partition is smaller, the switching of the driven image area will cause the corresponding backlight partition to change. Therefore, it is necessary to turn off the backlight of the backlight partition b2 and turn on the backlight of the backlight partition b3. In this case, the turning on and off of the backlight partition will cause the backlight flickering problem.

[0063] To solve the above problems, the embodiments of the present invention provide a method for transmitting dimming data, a display chip and a backlight module, which utilize the feature that the dimmer will retain the existing data when there is no data update, thereby reducing the transmission and processing volume of dimming data and control instructions, thereby reducing the electromagnetic interference problem of the display device, reducing the power consumption of the device, improving the backlight flicker problem, optimizing the display effect of the image, and improving the overall performance of the display device.

[0064] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention, and the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0065] The following describes the application scenarios of the dimming data transmission method provided by the present invention in conjunction with the accompanying drawings: The dimming data transmission method provided in the embodiment of the present invention can be applied in a display device, such as Figure 8 As shown, the display device 300 generally includes a timing controller 310, a dimming controller 320, a display panel 330 and a backlight panel 340; the timing controller 310 is connected to the dimming controller 320 and the display panel 330 respectively, and the dimming controller 320 is also connected to the backlight panel 340; the display panel 330 and the backlight panel 340 are arranged opposite to each other, and the display panel 330 is located on the light-emitting side of the backlight panel 340. Among them, a dimmer 341 and a light-emitting unit 342 are arranged on the backlight panel 340; the dimmer 341 is electrically connected to the cathode of the light-emitting unit 342, and the anode of the light-emitting unit 342 is electrically connected to the power supply terminal VDD. Exemplarily, the light-emitting unit 342 can adopt a direct-type AM MiniLED (English: Active Matrix Mini Light Emitting Diode, Chinese: Active Matrix Sub-Millimeter Light Emitting Diode).

[0066] In practical applications, the timing controller 310 in the embodiment of the present invention may adopt a TCON (English: Timing Controller, Chinese: timing controller) chip, or a SoC (English: System on Chip, Chinese: system-level chip), or other chips or circuits with timing control functions, such as a screen drive circuit, etc. The embodiment of the present invention does not impose any restrictions on this.

[0067] In addition, the dimming controller 320 in the embodiment of the present invention may adopt a dimming control chip, or may adopt an MCU (Microcontroller Unit), or may adopt other chips or circuits with backlight control function, and the embodiment of the present invention does not impose any restrictions on this.

[0068] It should be noted that the architecture of the backlight panel 340 in the display device 300 provided in the embodiment of the present invention can be Figure 2 or Figure 3 The backlight panel architecture shown may also adopt other feasible backlight panel architectures, and the embodiment of the present invention does not impose any limitation on this.

[0069] In a specific implementation, the timing controller 310 generates local dimming data (English: Local Dimming Data) according to the display data (English: DisplayData) corresponding to an image frame, and sends the local dimming data to the dimming controller 320, and sends the display data to the display panel 330. The dimming controller 320 processes the received local dimming data and sends the processed local dimming data to the backlight panel 340; the dimmer 341 in the backlight panel 340 generates PWM (English: Pulse-Width Modulation, Chinese: Pulse Width Modulation) local dimming data according to the received local dimming data, and sends the PWM local dimming data to the light-emitting unit 342 connected thereto to control the lighting of the light-emitting unit 342, thereby providing corresponding backlight for the display panel 330; the display panel 330 can display the image frame according to the received display data and using the backlight provided by the backlight panel 340.

[0070] Of course, the method provided in the embodiment of the present invention is not limited to Figure 8 The application scenario shown may also be used in other possible application scenarios, and the embodiments of the present invention do not impose any limitation thereto.

[0071] The following is a detailed description of the dimming data transmission method provided by the embodiment of the present invention in conjunction with the accompanying drawings: The dimming data transmission method provided in the embodiment of the present invention can be applied to various display chips, such as SoC, TCON, MCU, dimming controller and other chips, and the embodiment of the present invention does not impose any limitation on this.

[0072] Fig. 9 FIG. 2 is a schematic diagram showing a working process of a method for transmitting dimming data provided by an embodiment of the present invention. Fig. 9 As shown, the dimming data transmission method of the embodiment of the present invention may specifically include the following steps: Step S901 : determining dimming change data based on the dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed.

[0073] The dimming data corresponding to the image frame to be displayed may be obtained by the display chip according to the image data of the image frame to be displayed, or may be sent by a previous chip of the display chip, and the embodiment of the present invention does not impose any limitation on this.

[0074] In a specific implementation, the display chip can also store the dimming data corresponding to the previous image frame, and after obtaining the dimming data corresponding to the image frame to be displayed, compare the dimming data corresponding to the image frame to be displayed with the dimming data corresponding to the previous image frame stored in itself to determine the dimming change data.

[0075] Furthermore, in an embodiment of the present invention, the dimming data corresponding to an image frame may be monochrome local dimming data or color local dimming data, which is related to the specific architecture setting of the display device, and the embodiment of the present invention does not impose any restrictions on this; in addition, if it is color local dimming data, the color local dimming data may be for the three primary colors of RGB (English: RedGreenBlue, Chinese: red, green and blue), or for any other feasible color architecture, and the embodiment of the present invention does not impose any restrictions on this.

[0076] In some embodiments, the display chip can specifically implement the determination of the dimming change data in step S901 in the following manner: the display chip can determine the data change amount between the first dimming data and the second dimming data, and generate the dimming change data based on the determined data change amount, wherein the first dimming data is the dimming data corresponding to the image frame to be displayed, and the second dimming data is the dimming data corresponding to the previous image frame.

[0077] For the sake of convenience, the following embodiments will be combined with Fig.10 The backlight architecture shown is specifically explained. Of course, it should be understood that Fig.10 The backlight structure shown is only an example and should not limit the present invention in any way.

[0078] like Fig.10 As shown, the display chip 400 (which may be the dimming controller 320 in the aforementioned embodiment) is electrically connected to the backlight panel 340, and a plurality of dimmers 341 and a plurality of light-emitting units 342 are arranged on the backlight panel 340, and one dimmer 341 is electrically connected to two light-emitting units 342; the plurality of dimmers 341 are arranged in an array, and correspondingly, the plurality of light-emitting units 342 are also arranged in an array.

[0079] In a specific implementation, the dimming data corresponding to one image frame includes multiple dimming sub-data, and one dimming sub-data corresponds to one light-emitting unit 342 on the backlight panel 340, and is used to control the light brightness of the corresponding light-emitting unit 342. Therefore, in the embodiment of the present invention, the first dimming data includes multiple first dimming sub-data, and the second dimming data includes multiple second dimming sub-data. The display chip can specifically determine the dimming change data in the following manner: For any one of multiple first dimming sub-data, the display chip can determine the difference between the first dimming sub-data and the second dimming sub-data corresponding to the first dimming sub-data, and use the absolute value of the difference as the data change amount corresponding to the first dimming sub-data; after determining multiple data change amounts, the data change amounts corresponding to each first dimming sub-data are respectively used as the dimming change sub-data corresponding to each first dimming sub-data, and the dimming change sub-data corresponding to each first dimming sub-data are combined into dimming change data.

[0080] Exemplarily, assuming that the first dimming data can be expressed as: LDD_1=[d11, d12, d13, …, d1K], and the second dimming data can be expressed as: LDD_1=[d21, d22, d23, …, d2K], then the dimming change data can be expressed as: ΔLDD=[|d11-d21|, |d12-d22|, |d13-d23|, …, |d1K-d2K|]=[Δd1, Δd2, Δd3, …, ΔdK], wherein Δdi=|d1i-d2i| is used to characterize a dimming change sub-data, i is a positive integer, and 1≤i≤K; K is a positive integer, and the value of K is associated with the number of light-emitting units 342 set on the backlight panel 340.

[0081] Fig.11 FIG. 1 is a schematic diagram showing a method for determining dimming change data. Fig.11 As shown, the display device needs to display n image frames continuously, which can be represented as F1, F2, ..., Fn respectively, wherein for image frame F1, since it is the first image frame to be displayed, there is no previous image frame, and therefore, there is no need to determine the dimming change data. For image frame F2, image frame F1 is used as the previous image frame to determine the dimming change data corresponding to image frame F2. For image frame F3, image frame F2 is used as the previous image frame to determine the dimming change data corresponding to image frame F3, and so on, until the end.

[0082] In the process of determining dimming change data, the embodiment of the present invention can determine multiple data change amounts by calculating the difference between the dimming sub-data corresponding to the same light-emitting unit in two adjacent image frames, and form the determined multiple data change amounts into dimming change data. The dimming change data determined in the above manner can accurately reflect the change of the dimming data corresponding to each light-emitting unit, providing strong data support for subsequent motion estimation.

[0083] Step S902 , comparing the dimming change data with the dimming change threshold, determining a target area in the image frame to be displayed according to the comparison result, and generating target dimming data according to the dimming data corresponding to the target area.

[0084] In a specific implementation, after determining the dimming change data, the display chip will compare the dimming change data with the dimming change threshold corresponding to the image frame to be displayed. Specifically, since the dimming change data includes multiple dimming change sub-data, the magnitude relationship between each dimming change sub-data and the dimming change threshold will be compared to obtain a comparison result; among them, there will be the following two comparison results: Result 1: The display chip detects that there is at least one dimming change sub-data greater than or equal to the dimming change threshold.

[0085] Result 2: the display chip detects that there is no dimming change sub-data greater than or equal to the dimming change threshold, that is, all dimming change sub-data in the dimming change data are less than the dimming change threshold.

[0086] In some embodiments, if the comparison result is result 1, the display chip performs the following operations: When it is determined that there is dimming change sub-data greater than or equal to the dimming change threshold, the display chip can use the dimming change sub-data greater than or equal to the dimming change threshold as the target dimming change sub-data; and use the image area in the image frame to be displayed corresponding to the target dimming change sub-data as the target area.

[0087] In a specific implementation, since the dimming change sub-data corresponds to the first dimming sub-data one-to-one, after the display chip uses the dimming change sub-data greater than or equal to the dimming change threshold as the target dimming change sub-data, it can determine the corresponding image area in the image frame to be displayed according to the first dimming sub-data corresponding to the determined target dimming change sub-data, so as to obtain at least one target area. It should be noted that the number, position, size, etc. of the target areas determined on the image frame to be displayed are not limited in any way by the embodiments of the present invention.

[0088] Exemplarily, assuming that the dimming change data is: ΔLDD=[Δd1, Δd2, Δd3, ..., ΔdK], and the first dimming data is: LDD_1=[d11, d12, d13, ..., d1K], then the dimming change sub-data Δd1 corresponds to the first dimming sub-data d11, the dimming change sub-data Δd2 corresponds to the first dimming sub-data d12, and so on. If the display chip determines that Δd1, Δd2, and Δd3 in the dimming change data ΔLDD are all greater than the dimming change threshold value LDD_th, and the remaining dimming change sub-data in the dimming change data ΔLDD are all less than the dimming change threshold value LDD_th, then the image area corresponding to the first dimming sub-data d11, the first dimming sub-data d12, and the first dimming sub-data d13 is used as the target area.

[0089] In this way, by comparing the size relationship between each dimming change sub-data and the dimming change threshold, one or more target dimming change sub-data can be determined; and since the determined target dimming change sub-data is greater than or equal to the dimming change threshold, it means that the dimming data corresponding to these target dimming change sub-data has a large change between two adjacent image frames, and it can be determined that movement has occurred. In this way, the target area determined by the target dimming change sub-data in the image frame to be displayed is the area where movement has occurred, thereby achieving effective and accurate motion estimation.

[0090] Furthermore, in the embodiment of the present invention, the dimming change threshold may adopt a fixed value or an adjustable threshold. In a specific implementation, when the dimming change threshold adopts an adjustable threshold, the dimming change threshold may be adjusted in the following manner: The display chip can adjust the dimming change threshold corresponding to the previous image frame according to the display-related attribute information to obtain the dimming change threshold corresponding to the image frame to be displayed; wherein the adjusted dimming change threshold is greater than or equal to the preset dimming change lower limit threshold, and less than or equal to the preset dimming change upper limit threshold, and the display-related attribute information includes at least one of the characteristic information of the backlight unit and the characteristic information of the image frame to be displayed.

[0091] Specifically, a dimming change threshold range can be set, the upper limit of the range is the dimming change upper threshold, and the lower limit of the range is the dimming change lower threshold. The display chip can adjust the dimming change threshold within the dimming change threshold range according to the real-time display of the image; when the dimming change threshold is increased, the motion estimation will become slower, and the sensitivity of the dimming data change will be reduced, thereby effectively improving the backlight flicker problem; when the dimming change threshold is reduced, the motion estimation will become more sensitive, and the sensitivity of the dimming data change will be increased, bringing a more accurate motion estimation effect and improving the accuracy of motion image display.

[0092] In a specific implementation, the characteristic information of the backlight unit may include but is not limited to: the number of backlight partitions, the size of the backlight partitions, etc.; the characteristic information of the image frame to be displayed may include but is not limited to: the type of motion scene corresponding to the image frame.

[0093] For example, for a display device with a large number of backlight partitions and a small size, a larger value within the dimming change threshold range may be selected as the dimming change threshold.

[0094] For another example, the display chip can detect the type of motion scene based on the image information of the image frame to be displayed. When it is detected that the scene type to which the image frame to be displayed belongs is the first scene type, the current dimming change threshold is increased, wherein the first scene type can represent a scene with fast-moving targets, such as a ball game; when it is detected that the scene type to which the image frame to be displayed belongs is the second scene type, the current dimming change threshold is decreased, wherein the second scene type can represent a scene with slow-moving targets or a static scene, such as a scene with falling snowflakes.

[0095] It should be understood that the above-mentioned adjustment method of the dimming change threshold is only an exemplary description. In actual applications, other display-related attribute information can also be referred to to perform various adjustments to the dimming change threshold, such as linear adjustment, nonlinear adjustment, etc. The embodiments of the present invention are not limited to this.

[0096] Therefore, in the embodiment of the present invention, by setting the dimming change threshold to be adjustable and adaptively adjusting it, the accuracy of motion image display and the reduction of backlight flicker can be balanced, thereby bringing a better display effect to the display device.

[0097] In some embodiments, after determining the target area, the display chip may further perform the following operations: The display chip may generate target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data.

[0098] Exemplarily, assuming that the dimming change data is: LDD_1=[d11, d12, d13, …, d1K], and the first dimming sub-data corresponding to the target area is: d11, d12 and d13, the display chip will generate target dimming data based on the first dimming sub-data d11, the first dimming sub-data d12 and the first dimming sub-data d13.

[0099] In the above embodiment, since the target area is a partial image area in the image frame to be displayed, the data volume of the first dimming sub-data corresponding to the target area is smaller than the data volume of the first dimming data corresponding to the image frame to be displayed, so that the data volume of the determined target dimming data is also smaller than the data volume of the first dimming data. In this way, in the subsequent transmission of the target dimming data, compared with the method in the related art in which the dimming data corresponding to the entire image frame is transmitted, in the embodiment of the present invention, only the dimming data corresponding to the area where the movement occurs, that is, the target area, needs to be transmitted, so the data transmission amount and the processing amount can be effectively reduced.

[0100] Furthermore, after the display chip generates the target dimming data, the following operations are performed: Step S903: sending the target dimming data to a target dimmer, wherein the target dimmer is at least one dimmer corresponding to the target area.

[0101] Of course, in some cases, the target area may also be the entire image area corresponding to the image frame to be displayed, for example, when the motion picture display ends and the next picture is switched, the above situation will occur. In this case, the data volume of the target dimming data may be equal to the data volume of the first dimming data.

[0102] In some embodiments, if the comparison result is result 2, the display chip performs the following operations: When it is determined that the dimming change data is less than the dimming change threshold, the dimming data corresponding to the image frame to be displayed is not sent to the multiple dimmers, so that the multiple dimmers perform backlight control according to the dimming data stored in themselves.

[0103] In a specific implementation, if the display chip detects that the dimming change data is less than the dimming change threshold, that is, each dimming change sub-data included in the dimming change data is less than the dimming change threshold, then the dimming data will not be sent to each dimmer on the backlight panel, and control instructions will not be sent to each dimmer. At this time, there is no transmission of data and / or instructions.

[0104] In the above method, when it is determined that the dimming change data is less than the dimming change threshold, it means that the change in dimming data between two adjacent image frames is very small, and its change to the backlight brightness is also very small, then it can be determined that no motion has occurred. At this time, in the embodiment of the present invention, the dimming data corresponding to the image frame to be displayed will not be sent to each dimmer, that is, there will be no data transmission. Each dimmer will control the backlight according to the dimming data stored in itself, which can effectively reduce the amount of data transmission, avoid waste of resources caused by unnecessary data transmission, and effectively improve the performance of the display device.

[0105] Figure 12A to Figure 12C Schematic diagrams of different transmission modes of dimming data are shown respectively, wherein: Figure 12A to Figure 12CSo Fig.10 The backlight architecture shown is used as a baseline.

[0106] like Fig. 12A As shown, the left side is a schematic diagram of the transmission of dimming data corresponding to the previous image frame, and the right side is a schematic diagram of the transmission of dimming data corresponding to the image frame to be displayed. Fig. 12A In the case shown, due to Fig.10 There are 10 rows and 9 columns of light-emitting units 342, and each light-emitting unit 342 corresponds to a dimming sub-data. Therefore, Fig. 12A In the left side of , one “D” is used to represent the dimming sub-data corresponding to two light-emitting units 342 connected to one dimmer 341, that is, a total of 90 dimming sub-data are included.

[0107] By the method in the above embodiment, the target area is determined Fig. 12A The dotted box E1 on the right side corresponds to the dimming data corresponding to the previous image frame and the image frame to be displayed, and it is determined that only the brightness of the light-emitting unit 342 corresponding to the dotted box E1 has changed significantly, that is, only the dimming sub-data corresponding to the dotted box E1 needs to be changed. In this embodiment of the present invention, the target dimming data will be sent to the dimmer corresponding to the dotted box E1 (that is, the target dimmer), and other dimmers on the backlight panel will not receive the new dimming data. Fig. 12A As shown on the right, only part of the dimming data is transmitted, and the transmitted target dimming data includes 12 dimming sub-data, and the data volume of the transmitted dimming data is much smaller than the data volume of the dimming data corresponding to the image frame to be displayed.

[0108] like Fig. 12B As shown, the left side is a schematic diagram of the transmission of dimming data corresponding to the previous image frame, and the right side is a schematic diagram of the transmission of dimming data corresponding to the image frame to be displayed. Fig. 12B In the case shown, the determined target area is the entire image area of ​​the image frame to be displayed, which is Fig. 12B The dotted line frame E2 on the right corresponds to the image frame to be displayed, indicating that the overall dimming data of the image frame to be displayed has changed significantly compared with the previous image frame. Fig. 12B As shown on the right side, all dimming data corresponding to the image frame to be displayed will be transmitted to the dimmer corresponding to the dotted box E2 (ie, the target dimmer) to ensure the correct display of the image.

[0109] like Fig. 12C As shown, the left side is a schematic diagram of the transmission of dimming data corresponding to the previous image frame, and the right side is a schematic diagram of the transmission of dimming data corresponding to the image frame to be displayed. Fig. 12CIn the case shown, the target area is not determined in the image frame to be displayed, that is, each dimming change sub-data included in the dimming change data is smaller than the dimming change threshold, indicating that the overall dimming data of the image frame to be displayed has not changed significantly compared with the previous image frame. Fig. 12C As shown on the right, there is no need to transmit dimming data.

[0110] Furthermore, in the process of generating and transmitting the target dimming data by the display chip, there are at least the following two implementation methods: Method 1: In some embodiments, the display chip can determine multiple target dimming sub-data respectively according to the multiple first dimming sub-data corresponding to the target area, wherein the dimmers corresponding to the multiple first dimming sub-data are connected in series; and construct the target dimming data based on the control instructions and the multiple target dimming sub-data.

[0111] In a specific implementation, since one dimming sub-data corresponds to one light-emitting unit, and the dimmer connects multiple light-emitting units through different channels, it can also be considered that one dimming sub-data corresponds to one channel of the dimmer. In an embodiment of the present invention, in the process of generating target dimming data, the first dimming sub-data and control instructions corresponding to some of the dimmers connected in series among the multiple target dimmers corresponding to the target area can be used to form the target dimming data.

[0112] Fig.13 Schematic diagram showing the corresponding relationship between the backlight architecture and dimming data transmission. Fig.13 As shown, the left side is a schematic diagram of the backlight architecture, and the right side is a schematic diagram of the dimming data transmission, wherein the dotted box E1 on the right is the area where the dimming sub-data needs to be updated, which corresponds to the dotted box G1 on the left, and the dimmer in the dotted box G1 is the target dimmer.

[0113] Among the target dimmers indicated by the dotted frame G1, some dimmers need to update the dimming sub-data corresponding to all their channels, such as Fig.13 For the dimmer 341-A2 on the left, some dimmers only need to update the dimming sub-data corresponding to some of their own channels, such as Fig.13 Dimmer 341-A1 and dimmer 341-A3 on the left. Since dimmer 341-A1, dimmer 341-A2 and dimmer 341-A3 are connected in series, the display chip can combine the control instruction and the dimming sub-data corresponding to the channels in the three dimmers that need to update data into a target dimming data.

[0114] Therefore, in some embodiments, each target dimming sub-data included in the target dimming data may include dimming data information, address information and channel identification information, wherein the address information is used to determine the dimmer to which the dimming data information belongs, that is, the dimmer can match its own address information with the address information carried in the target dimming data, and store the dimming data information corresponding to the successfully matched address information, and then transmit it to the subsequent dimmer. The channel identification information is used to indicate a certain channel in a certain dimmer, and through the channel identification information, it is possible to update only the dimming sub-data of one or more channels in the dimmer.

[0115] It should be understood that the above embodiment is only an illustrative description for ease of understanding and should not impose any limitation on the present invention.

[0116] In some embodiments, after the display chip generates target dimming data in the above manner, the target dimming data can be transmitted sequentially to multiple target dimmers along a preset direction, wherein the multiple target dimmers are connected in series and the preset direction can be the direction from the first dimmer to the last dimmer.

[0117] Fig.14A FIG. 1 shows a schematic diagram of a working sequence of target dimming data transmission. Fig.14A As shown, the left side is a timing diagram of dimming data transmission corresponding to the previous image frame, and the right side is a timing diagram of dimming data transmission corresponding to the image frame to be displayed. Fig.14A As shown on the right, in the process of transmitting the target dimming data, each target dimming sub-data is transmitted to the corresponding target dimmer in sequence to update the dimming data stored in these target dimmers. The transmission method is simple and easy to implement.

[0118] Method 2: In some embodiments, for any one of the plurality of first dimming sub-data corresponding to the target area, the display chip may use the first dimming sub-data as the target dimming sub-data, and construct the target dimming data based on the control instruction and the target dimming sub-data.

[0119] Since the target dimming sub-data carries address information, in this case, when the display chip transmits target dimming data, it can transmit multiple target dimming data to multiple target dimmers simultaneously according to the address information carried in the target dimming data.

[0120] Fig. 14B Another working sequence diagram of target dimming data transmission is shown. Fig. 14B As shown, the left side is a timing diagram of dimming data transmission corresponding to the previous image frame, and the right side is a timing diagram of dimming data transmission corresponding to the image frame to be displayed. Fig. 14BAs shown on the right, in the process of transmitting the target dimming data, each target dimming sub-data can be simultaneously transmitted to the corresponding target dimmer at the start time of the display cycle.

[0121] Fig. 14C Another working sequence diagram of target dimming data transmission is shown. Fig. 14C As shown on the right, during the transmission of the target dimming data, each target dimming sub-data may also be simultaneously transmitted to the corresponding target dimmer at the end of the display cycle.

[0122] In this way, in the process of transmitting the target dimming data, a plurality of target dimming data are respectively and simultaneously transmitted to a plurality of target dimmers to update the dimming data stored in these target dimmers. The transmission method is flexible and the transmission efficiency is high.

[0123] Further, see Figure 14A to Figure 14C It can be seen that the transmission time of the target dimming data in the embodiment of the present invention can be flexibly set, as follows: In some embodiments, the display chip can set the transmission time of the target dimming data to be no earlier than the start time of the display cycle of the image frame to be displayed, and no later than the end time of the display cycle of the image frame to be displayed. Therefore, in the embodiment of the present invention, the target dimming data can be transmitted at any time within the display cycle of the image frame to be displayed, and the transmission time is flexible.

[0124] Fig.14D Another working sequence diagram of target dimming data transmission is shown. Fig.14D As shown, the left side is a timing diagram of dimming data transmission corresponding to the previous image frame, and the right side is a timing diagram of dimming data transmission corresponding to the image frame to be displayed. Fig.14D correspond Fig. 12B In the case shown in FIG. 1 , at this time, the overall dimming data of the image frame to be displayed has changed significantly compared with the previous image frame. Fig.14D As can be seen on the right, the target dimming data to be transmitted is a whole frame of dimming data.

[0125] Fig.14E Another working sequence diagram of target dimming data transmission is shown. Fig.14E As shown, the left side is a timing diagram of dimming data transmission corresponding to the previous image frame, and the right side is a timing diagram of dimming data transmission corresponding to the image frame to be displayed. Fig.14E correspond Fig. 12C In the case shown in FIG. 1 , at this time, the overall dimming data of the image frame to be displayed has not changed significantly compared with the previous image frame. Fig.14E As can be seen on the right, no new dimming data needs to be transmitted.

[0126] In the dimming data transmission method provided in the embodiment of the present invention, the motion of the image frame to be displayed is estimated by setting the dimming change threshold, and when it is determined that motion occurs, the target dimming data is generated only according to the dimming data corresponding to the target area where the motion occurs. The data amount of the target dimming data determined in this way is less than the data amount of all dimming data corresponding to the image frame to be displayed. When the target dimming data is sent to the corresponding part of the dimmers for backlight control, not only the transmission data amount can be reduced, but also the data processing amount can be reduced, thereby effectively reducing the electromagnetic wave interference problem of the display device and improving the backlight flicker problem. At the same time, the overall power consumption of the display device can be reduced, and the display performance of the display device can be improved.

[0127] The overall process of the dimming data transmission method provided by the embodiment of the present invention is introduced below: Fig.15 FIG. 1 shows a schematic diagram of the overall working process of a method for transmitting dimming data. Fig.15 As shown, it may include the following steps: Step S1501, the display chip determines dimming change data based on the dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed; Step S1502, the display chip determines whether there is dimming change sub-data greater than or equal to the dimming change threshold in the dimming change data, if so, execute step S1503, otherwise, execute step S1506; Step S1503, the display chip determines target dimming data according to the dimming change sub-data greater than or equal to the dimming change threshold and the dimming data corresponding to the image frame to be displayed; Step S1504, the display chip sends the target dimming data to the target dimmer; Step S1505, the target dimmer performs backlight control according to the target dimming data received by itself, and the remaining dimmers perform backlight control according to the dimming data stored by themselves; Step S1506, the display chip does not send dimming data corresponding to the image frame to be displayed to the dimmer; Step S1507: Each dimmer performs backlight control according to the dimming data stored in the dimmer.

[0128] Based on the same concept, an embodiment of the present invention further provides a display chip. Since the display chip is the display chip in the dimming data transmission method in the embodiment of the present invention, and the principle of solving the problem by the display chip is similar to that of the dimming data transmission method, the implementation of the display chip can refer to the implementation of the dimming data transmission method, and the repeated parts will not be repeated.

[0129] Fig.16 FIG. 2 shows a schematic diagram of the structure of a display chip provided by an embodiment of the present invention. Fig.16 As shown, the display chip 400 of the embodiment of the present invention may include: The data processing module 410 is used to determine the dimming change data based on the dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed; The data generating module 420 is used to compare the dimming change data with the dimming change threshold, determine the target area in the image frame to be displayed according to the comparison result, and generate target dimming data according to the dimming data corresponding to the target area; The data sending module 430 is used to send the target dimming data to the target dimmer, wherein the target dimmer is at least one dimmer corresponding to the target area.

[0130] In some embodiments, the data processing module 410 is specifically used to: Determine a data change amount between first dimming data and second dimming data, wherein the first dimming data is dimming data corresponding to the image frame to be displayed, and the second dimming data is dimming data corresponding to the previous image frame; According to the determined data change amount, dimming change data is generated.

[0131] In some embodiments, the first dimming data includes a plurality of first dimming sub-data, and the second dimming data includes a plurality of second dimming sub-data; The data processing module 410 is specifically used for: For any one of the plurality of first dimming sub-data, a difference between the first dimming sub-data and second dimming sub-data corresponding to the first dimming sub-data is determined, and an absolute value of the difference is used as a data variation corresponding to the first dimming sub-data.

[0132] In some embodiments, the dimming change data includes a plurality of dimming change sub-data; The data generation module 420 is specifically used for: When it is determined that there is dimming change sub-data greater than or equal to the dimming change threshold, taking the dimming change sub-data greater than or equal to the dimming change threshold as the target dimming change sub-data; An image region corresponding to the target dimming change sub-data in the image frame to be displayed is used as the target region.

[0133] In some embodiments, the data generation module 420 is specifically used to: Generate target dimming data according to the first dimming sub-data corresponding to the target area included in the first dimming data; The first dimming data is the dimming data corresponding to the image frame to be displayed, and the first dimming data includes a plurality of first dimming sub-data.

[0134] In some embodiments, the data generation module 420 is specifically used to: Determine a plurality of target dimming sub-data respectively according to a plurality of first dimming sub-data corresponding to the target area, wherein the dimmers corresponding to the plurality of first dimming sub-data are connected in series; Target dimming data is constructed based on the control instruction and the plurality of target dimming sub-data.

[0135] In some embodiments, the data sending module 430 is specifically used to: The target dimming data is transmitted to a plurality of target dimmers in sequence along a preset direction, wherein the plurality of target dimmers are connected in series.

[0136] In some embodiments, the data generation module 420 is specifically used to: For any one of the plurality of first dimming sub-data corresponding to the target area, the first dimming sub-data is used as the target dimming sub-data, and the target dimming data is constructed based on the control instruction and the target dimming sub-data.

[0137] In some embodiments, the data sending module 430 is specifically used to: According to the address information carried in the target dimming data, the multiple target dimming data are respectively and simultaneously transmitted to the multiple target dimmers.

[0138] In some embodiments, the data generation module 420 is further configured to: When it is determined that the dimming change data is less than the dimming change threshold, the dimming data corresponding to the image frame to be displayed is not sent to the multiple dimmers, so that the multiple dimmers perform backlight control according to the dimming data stored in themselves.

[0139] In some embodiments, the transmission time of the target dimming data is no earlier than the start time of the display period of the image frame to be displayed, and no later than the end time of the display period of the image frame to be displayed.

[0140] In some embodiments, the display chip further includes a threshold adjustment module; The threshold adjustment module is used to: According to the display-related attribute information, the dimming change threshold corresponding to the previous image frame is adjusted to obtain the dimming change threshold corresponding to the image frame to be displayed; Among them, the adjusted dimming change threshold is greater than or equal to the preset dimming change lower limit threshold, and less than or equal to the preset dimming change upper limit threshold, and the display-related attribute information includes at least one of the characteristic information of the backlight unit and the characteristic information of the image frame to be displayed.

[0141] Based on the same concept, an embodiment of the present invention further provides a backlight module, the principle of solving the problem of the backlight module is similar to that of the aforementioned display chip, so the implementation of the backlight module can refer to the implementation of the aforementioned display chip, and the repeated parts will not be repeated.

[0142] like Fig.10 As shown, the backlight module provided in the embodiment of the present invention may include a plurality of dimmers 341, a plurality of light emitting units 342 and a display chip 400 provided in any of the above embodiments, wherein: The display chip 400 is electrically connected to a plurality of dimmers 341 respectively, and one dimmer 341 is electrically connected to at least one light emitting unit 342; The dimmer 341 is used to generate a dimming control signal according to the target dimming data received by itself or the dimming data stored by itself, and use the dimming control signal to perform backlight control on the light-emitting unit 342 electrically connected to itself.

[0143] The display chip 400 in the embodiment of the present invention may be a chip such as SoC, TCON, MCU, dimming controller, etc., and the embodiment of the present invention does not impose any limitation on this.

[0144] In specific implementation, in the embodiments of the present invention, other essential components of the backlight module should be understood by those skilled in the art, and will not be described in detail herein, nor should they be used as limitations to the present invention.

[0145] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0146] 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 method for transmitting dimming data, characterized in that: include: Determine dimming change data based on dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed; Comparing the dimming change data with a dimming change threshold, determining a target area in the image frame to be displayed according to the comparison result, and generating target dimming data according to the dimming data corresponding to the target area; The target dimming data is sent to a target dimmer, wherein the target dimmer is at least one dimmer corresponding to the target area.

2. The method according to claim 1, characterized in that The determining the dimming change data based on the dimming data corresponding to the image frame to be displayed and the image frame before the image frame to be displayed, comprises: Determine a data change amount between first dimming data and second dimming data, wherein the first dimming data is dimming data corresponding to the image frame to be displayed, and the second dimming data is dimming data corresponding to the previous image frame; The dimming change data is generated according to the determined data change amount.

3. The method according to claim 2, characterized in that The first dimming data includes a plurality of first dimming sub-data, and the second dimming data includes a plurality of second dimming sub-data; The determining of the data change amount between the first dimming data and the second dimming data includes: For any one of the plurality of first dimming sub-data, a difference between the first dimming sub-data and second dimming sub-data corresponding to the first dimming sub-data is determined, and an absolute value of the difference is used as a data variation corresponding to the first dimming sub-data.

4. The method according to claim 1, characterized in that The dimming change data includes a plurality of dimming change sub-data; Determining the target area in the image frame to be displayed according to the comparison result includes: When it is determined that there is the dimming change sub-data which is greater than or equal to the dimming change threshold, taking the dimming change sub-data which is greater than or equal to the dimming change threshold as the target dimming change sub-data; An image region in the image frame to be displayed corresponding to the target dimming change sub-data is used as the target region.

5. The method according to claim 1, characterized in that The generating target dimming data according to the dimming data corresponding to the target area includes: generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data; The first dimming data is the dimming data corresponding to the image frame to be displayed, and the first dimming data includes a plurality of the first dimming sub-data.

6. The method according to claim 5, characterized in that The generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data comprises: Determine a plurality of target dimming sub-data respectively according to a plurality of first dimming sub-data corresponding to the target area, wherein the dimmers corresponding to the plurality of first dimming sub-data are connected in series; The target dimming data is constructed based on the control instruction and the plurality of target dimming sub-data.

7. The method according to claim 6, characterized in that The sending the target dimming data to the target dimmer includes: The target dimming data is transmitted to a plurality of target dimmers in sequence along a preset direction, wherein the plurality of target dimmers are connected in series.

8. The method according to claim 5, characterized in that The generating the target dimming data according to the first dimming sub-data corresponding to the target area and included in the first dimming data comprises: For any one of the plurality of first dimming sub-data corresponding to the target area, the first dimming sub-data is used as target dimming sub-data, and the target dimming data is constructed based on the control instruction and the target dimming sub-data.

9. The method according to claim 8, characterized in that The sending the target dimming data to the target dimmer includes: According to the address information carried in the target dimming data, a plurality of the target dimming data are respectively and simultaneously transmitted to a plurality of target dimmers.

10. The method according to any one of claims 1 to 9, characterized in that: After comparing the dimming change data with the dimming change threshold, the method further includes: When it is determined that the dimming change data is less than the dimming change threshold, the dimming data corresponding to the image frame to be displayed is not sent to the multiple dimmers, so that the multiple dimmers perform backlight control according to the dimming data stored in themselves.

11. The method according to any one of claims 1 to 9, characterized in that: The transmission time of the target dimming data is no earlier than the start time of the display period of the image frame to be displayed, and no later than the end time of the display period of the image frame to be displayed.

12. The method according to any one of claims 1 to 9, characterized in that: The method further comprises: According to the display-related attribute information, the dimming change threshold corresponding to the previous image frame is adjusted to obtain the dimming change threshold corresponding to the image frame to be displayed; Among them, the adjusted dimming change threshold is greater than or equal to the preset dimming change lower limit threshold, and less than or equal to the preset dimming change upper limit threshold, and the display-related attribute information includes at least one of the characteristic information of the backlight unit and the characteristic information of the image frame to be displayed.

13. A display chip, characterized in that: include: A data processing module, configured to determine dimming change data based on dimming data corresponding to the image frame to be displayed and the image frame preceding the image frame to be displayed; A data generating module, configured to compare the dimming change data with a dimming change threshold, determine a target area in the image frame to be displayed according to the comparison result, and generate target dimming data according to the dimming data corresponding to the target area; A data sending module is used to send the target dimming data to a target dimmer, wherein the target dimmer is a dimmer corresponding to the target area among a plurality of dimmers.

14. A backlight module, characterized in that: The device comprises a plurality of dimmers, a plurality of light emitting units and a display chip as claimed in claim 13, wherein: The display chip is electrically connected to the plurality of dimmers respectively, and one dimmer is electrically connected to at least one light-emitting unit; The dimmer is used to generate a dimming control signal according to the target dimming data received by itself or the dimming data stored by itself, and use the dimming control signal to perform backlight control on the light-emitting unit electrically connected to itself.

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